SemaDeclCXX.cpp revision 6cd03dbb310f472b14b8d6d69d8c9b5b7f1200e2
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/SmallString.h" 36#include "llvm/ADT/STLExtras.h" 37#include <map> 38#include <set> 39 40using namespace clang; 41 42//===----------------------------------------------------------------------===// 43// CheckDefaultArgumentVisitor 44//===----------------------------------------------------------------------===// 45 46namespace { 47 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 48 /// the default argument of a parameter to determine whether it 49 /// contains any ill-formed subexpressions. For example, this will 50 /// diagnose the use of local variables or parameters within the 51 /// default argument expression. 52 class CheckDefaultArgumentVisitor 53 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 54 Expr *DefaultArg; 55 Sema *S; 56 57 public: 58 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 59 : DefaultArg(defarg), S(s) {} 60 61 bool VisitExpr(Expr *Node); 62 bool VisitDeclRefExpr(DeclRefExpr *DRE); 63 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 64 }; 65 66 /// VisitExpr - Visit all of the children of this expression. 67 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 68 bool IsInvalid = false; 69 for (Stmt::child_range I = Node->children(); I; ++I) 70 IsInvalid |= Visit(*I); 71 return IsInvalid; 72 } 73 74 /// VisitDeclRefExpr - Visit a reference to a declaration, to 75 /// determine whether this declaration can be used in the default 76 /// argument expression. 77 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 78 NamedDecl *Decl = DRE->getDecl(); 79 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 80 // C++ [dcl.fct.default]p9 81 // Default arguments are evaluated each time the function is 82 // called. The order of evaluation of function arguments is 83 // unspecified. Consequently, parameters of a function shall not 84 // be used in default argument expressions, even if they are not 85 // evaluated. Parameters of a function declared before a default 86 // argument expression are in scope and can hide namespace and 87 // class member names. 88 return S->Diag(DRE->getSourceRange().getBegin(), 89 diag::err_param_default_argument_references_param) 90 << Param->getDeclName() << DefaultArg->getSourceRange(); 91 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 92 // C++ [dcl.fct.default]p7 93 // Local variables shall not be used in default argument 94 // expressions. 95 if (VDecl->isLocalVarDecl()) 96 return S->Diag(DRE->getSourceRange().getBegin(), 97 diag::err_param_default_argument_references_local) 98 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 99 } 100 101 return false; 102 } 103 104 /// VisitCXXThisExpr - Visit a C++ "this" expression. 105 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 106 // C++ [dcl.fct.default]p8: 107 // The keyword this shall not be used in a default argument of a 108 // member function. 109 return S->Diag(ThisE->getSourceRange().getBegin(), 110 diag::err_param_default_argument_references_this) 111 << ThisE->getSourceRange(); 112 } 113} 114 115void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 116 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 117 // If we have an MSAny or unknown spec already, don't bother. 118 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 119 return; 120 121 const FunctionProtoType *Proto 122 = Method->getType()->getAs<FunctionProtoType>(); 123 124 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 125 126 // If this function can throw any exceptions, make a note of that. 127 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 128 ClearExceptions(); 129 ComputedEST = EST; 130 return; 131 } 132 133 // FIXME: If the call to this decl is using any of its default arguments, we 134 // need to search them for potentially-throwing calls. 135 136 // If this function has a basic noexcept, it doesn't affect the outcome. 137 if (EST == EST_BasicNoexcept) 138 return; 139 140 // If we have a throw-all spec at this point, ignore the function. 141 if (ComputedEST == EST_None) 142 return; 143 144 // If we're still at noexcept(true) and there's a nothrow() callee, 145 // change to that specification. 146 if (EST == EST_DynamicNone) { 147 if (ComputedEST == EST_BasicNoexcept) 148 ComputedEST = EST_DynamicNone; 149 return; 150 } 151 152 // Check out noexcept specs. 153 if (EST == EST_ComputedNoexcept) { 154 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 155 assert(NR != FunctionProtoType::NR_NoNoexcept && 156 "Must have noexcept result for EST_ComputedNoexcept."); 157 assert(NR != FunctionProtoType::NR_Dependent && 158 "Should not generate implicit declarations for dependent cases, " 159 "and don't know how to handle them anyway."); 160 161 // noexcept(false) -> no spec on the new function 162 if (NR == FunctionProtoType::NR_Throw) { 163 ClearExceptions(); 164 ComputedEST = EST_None; 165 } 166 // noexcept(true) won't change anything either. 167 return; 168 } 169 170 assert(EST == EST_Dynamic && "EST case not considered earlier."); 171 assert(ComputedEST != EST_None && 172 "Shouldn't collect exceptions when throw-all is guaranteed."); 173 ComputedEST = EST_Dynamic; 174 // Record the exceptions in this function's exception specification. 175 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 176 EEnd = Proto->exception_end(); 177 E != EEnd; ++E) 178 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 179 Exceptions.push_back(*E); 180} 181 182void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 183 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 184 return; 185 186 // FIXME: 187 // 188 // C++0x [except.spec]p14: 189 // [An] implicit exception-specification specifies the type-id T if and 190 // only if T is allowed by the exception-specification of a function directly 191 // invoked by f's implicit definition; f shall allow all exceptions if any 192 // function it directly invokes allows all exceptions, and f shall allow no 193 // exceptions if every function it directly invokes allows no exceptions. 194 // 195 // Note in particular that if an implicit exception-specification is generated 196 // for a function containing a throw-expression, that specification can still 197 // be noexcept(true). 198 // 199 // Note also that 'directly invoked' is not defined in the standard, and there 200 // is no indication that we should only consider potentially-evaluated calls. 201 // 202 // Ultimately we should implement the intent of the standard: the exception 203 // specification should be the set of exceptions which can be thrown by the 204 // implicit definition. For now, we assume that any non-nothrow expression can 205 // throw any exception. 206 207 if (E->CanThrow(*Context)) 208 ComputedEST = EST_None; 209} 210 211bool 212Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 213 SourceLocation EqualLoc) { 214 if (RequireCompleteType(Param->getLocation(), Param->getType(), 215 diag::err_typecheck_decl_incomplete_type)) { 216 Param->setInvalidDecl(); 217 return true; 218 } 219 220 // C++ [dcl.fct.default]p5 221 // A default argument expression is implicitly converted (clause 222 // 4) to the parameter type. The default argument expression has 223 // the same semantic constraints as the initializer expression in 224 // a declaration of a variable of the parameter type, using the 225 // copy-initialization semantics (8.5). 226 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 227 Param); 228 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 229 EqualLoc); 230 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 231 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 232 MultiExprArg(*this, &Arg, 1)); 233 if (Result.isInvalid()) 234 return true; 235 Arg = Result.takeAs<Expr>(); 236 237 CheckImplicitConversions(Arg, EqualLoc); 238 Arg = MaybeCreateExprWithCleanups(Arg); 239 240 // Okay: add the default argument to the parameter 241 Param->setDefaultArg(Arg); 242 243 // We have already instantiated this parameter; provide each of the 244 // instantiations with the uninstantiated default argument. 245 UnparsedDefaultArgInstantiationsMap::iterator InstPos 246 = UnparsedDefaultArgInstantiations.find(Param); 247 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 248 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 249 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 250 251 // We're done tracking this parameter's instantiations. 252 UnparsedDefaultArgInstantiations.erase(InstPos); 253 } 254 255 return false; 256} 257 258/// ActOnParamDefaultArgument - Check whether the default argument 259/// provided for a function parameter is well-formed. If so, attach it 260/// to the parameter declaration. 261void 262Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 263 Expr *DefaultArg) { 264 if (!param || !DefaultArg) 265 return; 266 267 ParmVarDecl *Param = cast<ParmVarDecl>(param); 268 UnparsedDefaultArgLocs.erase(Param); 269 270 // Default arguments are only permitted in C++ 271 if (!getLangOptions().CPlusPlus) { 272 Diag(EqualLoc, diag::err_param_default_argument) 273 << DefaultArg->getSourceRange(); 274 Param->setInvalidDecl(); 275 return; 276 } 277 278 // Check for unexpanded parameter packs. 279 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 280 Param->setInvalidDecl(); 281 return; 282 } 283 284 // Check that the default argument is well-formed 285 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 286 if (DefaultArgChecker.Visit(DefaultArg)) { 287 Param->setInvalidDecl(); 288 return; 289 } 290 291 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 292} 293 294/// ActOnParamUnparsedDefaultArgument - We've seen a default 295/// argument for a function parameter, but we can't parse it yet 296/// because we're inside a class definition. Note that this default 297/// argument will be parsed later. 298void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 299 SourceLocation EqualLoc, 300 SourceLocation ArgLoc) { 301 if (!param) 302 return; 303 304 ParmVarDecl *Param = cast<ParmVarDecl>(param); 305 if (Param) 306 Param->setUnparsedDefaultArg(); 307 308 UnparsedDefaultArgLocs[Param] = ArgLoc; 309} 310 311/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 312/// the default argument for the parameter param failed. 313void Sema::ActOnParamDefaultArgumentError(Decl *param) { 314 if (!param) 315 return; 316 317 ParmVarDecl *Param = cast<ParmVarDecl>(param); 318 319 Param->setInvalidDecl(); 320 321 UnparsedDefaultArgLocs.erase(Param); 322} 323 324/// CheckExtraCXXDefaultArguments - Check for any extra default 325/// arguments in the declarator, which is not a function declaration 326/// or definition and therefore is not permitted to have default 327/// arguments. This routine should be invoked for every declarator 328/// that is not a function declaration or definition. 329void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 330 // C++ [dcl.fct.default]p3 331 // A default argument expression shall be specified only in the 332 // parameter-declaration-clause of a function declaration or in a 333 // template-parameter (14.1). It shall not be specified for a 334 // parameter pack. If it is specified in a 335 // parameter-declaration-clause, it shall not occur within a 336 // declarator or abstract-declarator of a parameter-declaration. 337 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 338 DeclaratorChunk &chunk = D.getTypeObject(i); 339 if (chunk.Kind == DeclaratorChunk::Function) { 340 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 341 ParmVarDecl *Param = 342 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 343 if (Param->hasUnparsedDefaultArg()) { 344 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 345 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 346 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 347 delete Toks; 348 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 349 } else if (Param->getDefaultArg()) { 350 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 351 << Param->getDefaultArg()->getSourceRange(); 352 Param->setDefaultArg(0); 353 } 354 } 355 } 356 } 357} 358 359// MergeCXXFunctionDecl - Merge two declarations of the same C++ 360// function, once we already know that they have the same 361// type. Subroutine of MergeFunctionDecl. Returns true if there was an 362// error, false otherwise. 363bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 364 bool Invalid = false; 365 366 // C++ [dcl.fct.default]p4: 367 // For non-template functions, default arguments can be added in 368 // later declarations of a function in the same 369 // scope. Declarations in different scopes have completely 370 // distinct sets of default arguments. That is, declarations in 371 // inner scopes do not acquire default arguments from 372 // declarations in outer scopes, and vice versa. In a given 373 // function declaration, all parameters subsequent to a 374 // parameter with a default argument shall have default 375 // arguments supplied in this or previous declarations. A 376 // default argument shall not be redefined by a later 377 // declaration (not even to the same value). 378 // 379 // C++ [dcl.fct.default]p6: 380 // Except for member functions of class templates, the default arguments 381 // in a member function definition that appears outside of the class 382 // definition are added to the set of default arguments provided by the 383 // member function declaration in the class definition. 384 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 385 ParmVarDecl *OldParam = Old->getParamDecl(p); 386 ParmVarDecl *NewParam = New->getParamDecl(p); 387 388 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 389 390 unsigned DiagDefaultParamID = 391 diag::err_param_default_argument_redefinition; 392 393 // MSVC accepts that default parameters be redefined for member functions 394 // of template class. The new default parameter's value is ignored. 395 Invalid = true; 396 if (getLangOptions().MicrosoftExt) { 397 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 398 if (MD && MD->getParent()->getDescribedClassTemplate()) { 399 // Merge the old default argument into the new parameter. 400 NewParam->setHasInheritedDefaultArg(); 401 if (OldParam->hasUninstantiatedDefaultArg()) 402 NewParam->setUninstantiatedDefaultArg( 403 OldParam->getUninstantiatedDefaultArg()); 404 else 405 NewParam->setDefaultArg(OldParam->getInit()); 406 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 407 Invalid = false; 408 } 409 } 410 411 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 412 // hint here. Alternatively, we could walk the type-source information 413 // for NewParam to find the last source location in the type... but it 414 // isn't worth the effort right now. This is the kind of test case that 415 // is hard to get right: 416 // int f(int); 417 // void g(int (*fp)(int) = f); 418 // void g(int (*fp)(int) = &f); 419 Diag(NewParam->getLocation(), DiagDefaultParamID) 420 << NewParam->getDefaultArgRange(); 421 422 // Look for the function declaration where the default argument was 423 // actually written, which may be a declaration prior to Old. 424 for (FunctionDecl *Older = Old->getPreviousDecl(); 425 Older; Older = Older->getPreviousDecl()) { 426 if (!Older->getParamDecl(p)->hasDefaultArg()) 427 break; 428 429 OldParam = Older->getParamDecl(p); 430 } 431 432 Diag(OldParam->getLocation(), diag::note_previous_definition) 433 << OldParam->getDefaultArgRange(); 434 } else if (OldParam->hasDefaultArg()) { 435 // Merge the old default argument into the new parameter. 436 // It's important to use getInit() here; getDefaultArg() 437 // strips off any top-level ExprWithCleanups. 438 NewParam->setHasInheritedDefaultArg(); 439 if (OldParam->hasUninstantiatedDefaultArg()) 440 NewParam->setUninstantiatedDefaultArg( 441 OldParam->getUninstantiatedDefaultArg()); 442 else 443 NewParam->setDefaultArg(OldParam->getInit()); 444 } else if (NewParam->hasDefaultArg()) { 445 if (New->getDescribedFunctionTemplate()) { 446 // Paragraph 4, quoted above, only applies to non-template functions. 447 Diag(NewParam->getLocation(), 448 diag::err_param_default_argument_template_redecl) 449 << NewParam->getDefaultArgRange(); 450 Diag(Old->getLocation(), diag::note_template_prev_declaration) 451 << false; 452 } else if (New->getTemplateSpecializationKind() 453 != TSK_ImplicitInstantiation && 454 New->getTemplateSpecializationKind() != TSK_Undeclared) { 455 // C++ [temp.expr.spec]p21: 456 // Default function arguments shall not be specified in a declaration 457 // or a definition for one of the following explicit specializations: 458 // - the explicit specialization of a function template; 459 // - the explicit specialization of a member function template; 460 // - the explicit specialization of a member function of a class 461 // template where the class template specialization to which the 462 // member function specialization belongs is implicitly 463 // instantiated. 464 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 465 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 466 << New->getDeclName() 467 << NewParam->getDefaultArgRange(); 468 } else if (New->getDeclContext()->isDependentContext()) { 469 // C++ [dcl.fct.default]p6 (DR217): 470 // Default arguments for a member function of a class template shall 471 // be specified on the initial declaration of the member function 472 // within the class template. 473 // 474 // Reading the tea leaves a bit in DR217 and its reference to DR205 475 // leads me to the conclusion that one cannot add default function 476 // arguments for an out-of-line definition of a member function of a 477 // dependent type. 478 int WhichKind = 2; 479 if (CXXRecordDecl *Record 480 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 481 if (Record->getDescribedClassTemplate()) 482 WhichKind = 0; 483 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 484 WhichKind = 1; 485 else 486 WhichKind = 2; 487 } 488 489 Diag(NewParam->getLocation(), 490 diag::err_param_default_argument_member_template_redecl) 491 << WhichKind 492 << NewParam->getDefaultArgRange(); 493 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 494 CXXSpecialMember NewSM = getSpecialMember(Ctor), 495 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 496 if (NewSM != OldSM) { 497 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 498 << NewParam->getDefaultArgRange() << NewSM; 499 Diag(Old->getLocation(), diag::note_previous_declaration_special) 500 << OldSM; 501 } 502 } 503 } 504 } 505 506 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 507 // template has a constexpr specifier then all its declarations shall 508 // contain the constexpr specifier. [Note: An explicit specialization can 509 // differ from the template declaration with respect to the constexpr 510 // specifier. -- end note] 511 // 512 // FIXME: Don't reject changes in constexpr in explicit specializations. 513 if (New->isConstexpr() != Old->isConstexpr()) { 514 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 515 << New << New->isConstexpr(); 516 Diag(Old->getLocation(), diag::note_previous_declaration); 517 Invalid = true; 518 } 519 520 if (CheckEquivalentExceptionSpec(Old, New)) 521 Invalid = true; 522 523 return Invalid; 524} 525 526/// \brief Merge the exception specifications of two variable declarations. 527/// 528/// This is called when there's a redeclaration of a VarDecl. The function 529/// checks if the redeclaration might have an exception specification and 530/// validates compatibility and merges the specs if necessary. 531void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 532 // Shortcut if exceptions are disabled. 533 if (!getLangOptions().CXXExceptions) 534 return; 535 536 assert(Context.hasSameType(New->getType(), Old->getType()) && 537 "Should only be called if types are otherwise the same."); 538 539 QualType NewType = New->getType(); 540 QualType OldType = Old->getType(); 541 542 // We're only interested in pointers and references to functions, as well 543 // as pointers to member functions. 544 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 545 NewType = R->getPointeeType(); 546 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 547 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 548 NewType = P->getPointeeType(); 549 OldType = OldType->getAs<PointerType>()->getPointeeType(); 550 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 551 NewType = M->getPointeeType(); 552 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 553 } 554 555 if (!NewType->isFunctionProtoType()) 556 return; 557 558 // There's lots of special cases for functions. For function pointers, system 559 // libraries are hopefully not as broken so that we don't need these 560 // workarounds. 561 if (CheckEquivalentExceptionSpec( 562 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 563 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 564 New->setInvalidDecl(); 565 } 566} 567 568/// CheckCXXDefaultArguments - Verify that the default arguments for a 569/// function declaration are well-formed according to C++ 570/// [dcl.fct.default]. 571void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 572 unsigned NumParams = FD->getNumParams(); 573 unsigned p; 574 575 // Find first parameter with a default argument 576 for (p = 0; p < NumParams; ++p) { 577 ParmVarDecl *Param = FD->getParamDecl(p); 578 if (Param->hasDefaultArg()) 579 break; 580 } 581 582 // C++ [dcl.fct.default]p4: 583 // In a given function declaration, all parameters 584 // subsequent to a parameter with a default argument shall 585 // have default arguments supplied in this or previous 586 // declarations. A default argument shall not be redefined 587 // by a later declaration (not even to the same value). 588 unsigned LastMissingDefaultArg = 0; 589 for (; p < NumParams; ++p) { 590 ParmVarDecl *Param = FD->getParamDecl(p); 591 if (!Param->hasDefaultArg()) { 592 if (Param->isInvalidDecl()) 593 /* We already complained about this parameter. */; 594 else if (Param->getIdentifier()) 595 Diag(Param->getLocation(), 596 diag::err_param_default_argument_missing_name) 597 << Param->getIdentifier(); 598 else 599 Diag(Param->getLocation(), 600 diag::err_param_default_argument_missing); 601 602 LastMissingDefaultArg = p; 603 } 604 } 605 606 if (LastMissingDefaultArg > 0) { 607 // Some default arguments were missing. Clear out all of the 608 // default arguments up to (and including) the last missing 609 // default argument, so that we leave the function parameters 610 // in a semantically valid state. 611 for (p = 0; p <= LastMissingDefaultArg; ++p) { 612 ParmVarDecl *Param = FD->getParamDecl(p); 613 if (Param->hasDefaultArg()) { 614 Param->setDefaultArg(0); 615 } 616 } 617 } 618} 619 620// CheckConstexprParameterTypes - Check whether a function's parameter types 621// are all literal types. If so, return true. If not, produce a suitable 622// diagnostic depending on @p CCK and return false. 623static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 624 Sema::CheckConstexprKind CCK) { 625 unsigned ArgIndex = 0; 626 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 627 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 628 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 629 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 630 SourceLocation ParamLoc = PD->getLocation(); 631 if (!(*i)->isDependentType() && 632 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 633 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 634 << ArgIndex+1 << PD->getSourceRange() 635 << isa<CXXConstructorDecl>(FD) : 636 SemaRef.PDiag(), 637 /*AllowIncompleteType*/ true)) { 638 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 639 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 640 << ArgIndex+1 << PD->getSourceRange() 641 << isa<CXXConstructorDecl>(FD) << *i; 642 return false; 643 } 644 } 645 return true; 646} 647 648// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 649// the requirements of a constexpr function declaration or a constexpr 650// constructor declaration. Return true if it does, false if not. 651// 652// This implements C++11 [dcl.constexpr]p3,4, as amended by N3308. 653// 654// \param CCK Specifies whether to produce diagnostics if the function does not 655// satisfy the requirements. 656bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 657 CheckConstexprKind CCK) { 658 assert((CCK != CCK_NoteNonConstexprInstantiation || 659 (NewFD->getTemplateInstantiationPattern() && 660 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 661 "only constexpr templates can be instantiated non-constexpr"); 662 663 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 664 if (MD && MD->isInstance()) { 665 // C++11 [dcl.constexpr]p4: In the definition of a constexpr constructor... 666 // In addition, either its function-body shall be = delete or = default or 667 // it shall satisfy the following constraints: 668 // - the class shall not have any virtual base classes; 669 // 670 // We apply this to constexpr member functions too: the class cannot be a 671 // literal type, so the members are not permitted to be constexpr. 672 const CXXRecordDecl *RD = MD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 683 << RD->getNumVBases(); 684 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 685 E = RD->vbases_end(); I != E; ++I) 686 Diag(I->getSourceRange().getBegin(), 687 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 688 } 689 return false; 690 } 691 } 692 693 if (!isa<CXXConstructorDecl>(NewFD)) { 694 // C++11 [dcl.constexpr]p3: 695 // The definition of a constexpr function shall satisfy the following 696 // constraints: 697 // - it shall not be virtual; 698 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 699 if (Method && Method->isVirtual()) { 700 if (CCK != CCK_Instantiation) { 701 Diag(NewFD->getLocation(), 702 CCK == CCK_Declaration ? diag::err_constexpr_virtual 703 : diag::note_constexpr_tmpl_virtual); 704 705 // If it's not obvious why this function is virtual, find an overridden 706 // function which uses the 'virtual' keyword. 707 const CXXMethodDecl *WrittenVirtual = Method; 708 while (!WrittenVirtual->isVirtualAsWritten()) 709 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 710 if (WrittenVirtual != Method) 711 Diag(WrittenVirtual->getLocation(), 712 diag::note_overridden_virtual_function); 713 } 714 return false; 715 } 716 717 // - its return type shall be a literal type; 718 QualType RT = NewFD->getResultType(); 719 if (!RT->isDependentType() && 720 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 721 PDiag(diag::err_constexpr_non_literal_return) : 722 PDiag(), 723 /*AllowIncompleteType*/ true)) { 724 if (CCK == CCK_NoteNonConstexprInstantiation) 725 Diag(NewFD->getLocation(), 726 diag::note_constexpr_tmpl_non_literal_return) << RT; 727 return false; 728 } 729 } 730 731 // - each of its parameter types shall be a literal type; 732 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 733 return false; 734 735 return true; 736} 737 738/// Check the given declaration statement is legal within a constexpr function 739/// body. C++0x [dcl.constexpr]p3,p4. 740/// 741/// \return true if the body is OK, false if we have diagnosed a problem. 742static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 743 DeclStmt *DS) { 744 // C++0x [dcl.constexpr]p3 and p4: 745 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 746 // contain only 747 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 748 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 749 switch ((*DclIt)->getKind()) { 750 case Decl::StaticAssert: 751 case Decl::Using: 752 case Decl::UsingShadow: 753 case Decl::UsingDirective: 754 case Decl::UnresolvedUsingTypename: 755 // - static_assert-declarations 756 // - using-declarations, 757 // - using-directives, 758 continue; 759 760 case Decl::Typedef: 761 case Decl::TypeAlias: { 762 // - typedef declarations and alias-declarations that do not define 763 // classes or enumerations, 764 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 765 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 766 // Don't allow variably-modified types in constexpr functions. 767 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 768 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 769 << TL.getSourceRange() << TL.getType() 770 << isa<CXXConstructorDecl>(Dcl); 771 return false; 772 } 773 continue; 774 } 775 776 case Decl::Enum: 777 case Decl::CXXRecord: 778 // As an extension, we allow the declaration (but not the definition) of 779 // classes and enumerations in all declarations, not just in typedef and 780 // alias declarations. 781 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 782 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 783 << isa<CXXConstructorDecl>(Dcl); 784 return false; 785 } 786 continue; 787 788 case Decl::Var: 789 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 790 << isa<CXXConstructorDecl>(Dcl); 791 return false; 792 793 default: 794 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 795 << isa<CXXConstructorDecl>(Dcl); 796 return false; 797 } 798 } 799 800 return true; 801} 802 803/// Check that the given field is initialized within a constexpr constructor. 804/// 805/// \param Dcl The constexpr constructor being checked. 806/// \param Field The field being checked. This may be a member of an anonymous 807/// struct or union nested within the class being checked. 808/// \param Inits All declarations, including anonymous struct/union members and 809/// indirect members, for which any initialization was provided. 810/// \param Diagnosed Set to true if an error is produced. 811static void CheckConstexprCtorInitializer(Sema &SemaRef, 812 const FunctionDecl *Dcl, 813 FieldDecl *Field, 814 llvm::SmallSet<Decl*, 16> &Inits, 815 bool &Diagnosed) { 816 if (Field->isUnnamedBitfield()) 817 return; 818 819 if (!Inits.count(Field)) { 820 if (!Diagnosed) { 821 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 822 Diagnosed = true; 823 } 824 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 825 } else if (Field->isAnonymousStructOrUnion()) { 826 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 827 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 828 I != E; ++I) 829 // If an anonymous union contains an anonymous struct of which any member 830 // is initialized, all members must be initialized. 831 if (!RD->isUnion() || Inits.count(*I)) 832 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 833 } 834} 835 836/// Check the body for the given constexpr function declaration only contains 837/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 838/// 839/// \return true if the body is OK, false if we have diagnosed a problem. 840bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 841 if (isa<CXXTryStmt>(Body)) { 842 // C++11 [dcl.constexpr]p3: 843 // The definition of a constexpr function shall satisfy the following 844 // constraints: [...] 845 // - its function-body shall be = delete, = default, or a 846 // compound-statement 847 // 848 // C++11 [dcl.constexpr]p4: 849 // In the definition of a constexpr constructor, [...] 850 // - its function-body shall not be a function-try-block; 851 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 852 << isa<CXXConstructorDecl>(Dcl); 853 return false; 854 } 855 856 // - its function-body shall be [...] a compound-statement that contains only 857 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 858 859 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 860 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 861 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 862 switch ((*BodyIt)->getStmtClass()) { 863 case Stmt::NullStmtClass: 864 // - null statements, 865 continue; 866 867 case Stmt::DeclStmtClass: 868 // - static_assert-declarations 869 // - using-declarations, 870 // - using-directives, 871 // - typedef declarations and alias-declarations that do not define 872 // classes or enumerations, 873 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 874 return false; 875 continue; 876 877 case Stmt::ReturnStmtClass: 878 // - and exactly one return statement; 879 if (isa<CXXConstructorDecl>(Dcl)) 880 break; 881 882 ReturnStmts.push_back((*BodyIt)->getLocStart()); 883 // FIXME 884 // - every constructor call and implicit conversion used in initializing 885 // the return value shall be one of those allowed in a constant 886 // expression. 887 // Deal with this as part of a general check that the function can produce 888 // a constant expression (for [dcl.constexpr]p5). 889 continue; 890 891 default: 892 break; 893 } 894 895 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 896 << isa<CXXConstructorDecl>(Dcl); 897 return false; 898 } 899 900 if (const CXXConstructorDecl *Constructor 901 = dyn_cast<CXXConstructorDecl>(Dcl)) { 902 const CXXRecordDecl *RD = Constructor->getParent(); 903 // - every non-static data member and base class sub-object shall be 904 // initialized; 905 if (RD->isUnion()) { 906 // DR1359: Exactly one member of a union shall be initialized. 907 if (Constructor->getNumCtorInitializers() == 0) { 908 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 909 return false; 910 } 911 } else if (!Constructor->isDependentContext() && 912 !Constructor->isDelegatingConstructor()) { 913 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 914 915 // Skip detailed checking if we have enough initializers, and we would 916 // allow at most one initializer per member. 917 bool AnyAnonStructUnionMembers = false; 918 unsigned Fields = 0; 919 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 920 E = RD->field_end(); I != E; ++I, ++Fields) { 921 if ((*I)->isAnonymousStructOrUnion()) { 922 AnyAnonStructUnionMembers = true; 923 break; 924 } 925 } 926 if (AnyAnonStructUnionMembers || 927 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 928 // Check initialization of non-static data members. Base classes are 929 // always initialized so do not need to be checked. Dependent bases 930 // might not have initializers in the member initializer list. 931 llvm::SmallSet<Decl*, 16> Inits; 932 for (CXXConstructorDecl::init_const_iterator 933 I = Constructor->init_begin(), E = Constructor->init_end(); 934 I != E; ++I) { 935 if (FieldDecl *FD = (*I)->getMember()) 936 Inits.insert(FD); 937 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 938 Inits.insert(ID->chain_begin(), ID->chain_end()); 939 } 940 941 bool Diagnosed = false; 942 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 943 E = RD->field_end(); I != E; ++I) 944 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 945 if (Diagnosed) 946 return false; 947 } 948 } 949 950 // FIXME 951 // - every constructor involved in initializing non-static data members 952 // and base class sub-objects shall be a constexpr constructor; 953 // - every assignment-expression that is an initializer-clause appearing 954 // directly or indirectly within a brace-or-equal-initializer for 955 // a non-static data member that is not named by a mem-initializer-id 956 // shall be a constant expression; and 957 // - every implicit conversion used in converting a constructor argument 958 // to the corresponding parameter type and converting 959 // a full-expression to the corresponding member type shall be one of 960 // those allowed in a constant expression. 961 // Deal with these as part of a general check that the function can produce 962 // a constant expression (for [dcl.constexpr]p5). 963 } else { 964 if (ReturnStmts.empty()) { 965 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 966 return false; 967 } 968 if (ReturnStmts.size() > 1) { 969 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 970 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 971 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 972 return false; 973 } 974 } 975 976 // C++11 [dcl.constexpr]p5: 977 // if no function argument values exist such that the function invocation 978 // substitution would produce a constant expression, the program is 979 // ill-formed; no diagnostic required. 980 // C++11 [dcl.constexpr]p3: 981 // - every constructor call and implicit conversion used in initializing the 982 // return value shall be one of those allowed in a constant expression. 983 // C++11 [dcl.constexpr]p4: 984 // - every constructor involved in initializing non-static data members and 985 // base class sub-objects shall be a constexpr constructor. 986 // 987 // FIXME: We currently disable this check inside system headers, to work 988 // around early STL implementations which contain constexpr functions which 989 // can't produce constant expressions. 990 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 991 if (!Context.getSourceManager().isInSystemHeader(Dcl->getLocation()) && 992 !Expr::isPotentialConstantExpr(Dcl, Diags)) { 993 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 994 << isa<CXXConstructorDecl>(Dcl); 995 for (size_t I = 0, N = Diags.size(); I != N; ++I) 996 Diag(Diags[I].first, Diags[I].second); 997 return false; 998 } 999 1000 return true; 1001} 1002 1003/// isCurrentClassName - Determine whether the identifier II is the 1004/// name of the class type currently being defined. In the case of 1005/// nested classes, this will only return true if II is the name of 1006/// the innermost class. 1007bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1008 const CXXScopeSpec *SS) { 1009 assert(getLangOptions().CPlusPlus && "No class names in C!"); 1010 1011 CXXRecordDecl *CurDecl; 1012 if (SS && SS->isSet() && !SS->isInvalid()) { 1013 DeclContext *DC = computeDeclContext(*SS, true); 1014 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1015 } else 1016 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1017 1018 if (CurDecl && CurDecl->getIdentifier()) 1019 return &II == CurDecl->getIdentifier(); 1020 else 1021 return false; 1022} 1023 1024/// \brief Check the validity of a C++ base class specifier. 1025/// 1026/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1027/// and returns NULL otherwise. 1028CXXBaseSpecifier * 1029Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1030 SourceRange SpecifierRange, 1031 bool Virtual, AccessSpecifier Access, 1032 TypeSourceInfo *TInfo, 1033 SourceLocation EllipsisLoc) { 1034 QualType BaseType = TInfo->getType(); 1035 1036 // C++ [class.union]p1: 1037 // A union shall not have base classes. 1038 if (Class->isUnion()) { 1039 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1040 << SpecifierRange; 1041 return 0; 1042 } 1043 1044 if (EllipsisLoc.isValid() && 1045 !TInfo->getType()->containsUnexpandedParameterPack()) { 1046 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1047 << TInfo->getTypeLoc().getSourceRange(); 1048 EllipsisLoc = SourceLocation(); 1049 } 1050 1051 if (BaseType->isDependentType()) 1052 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1053 Class->getTagKind() == TTK_Class, 1054 Access, TInfo, EllipsisLoc); 1055 1056 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1057 1058 // Base specifiers must be record types. 1059 if (!BaseType->isRecordType()) { 1060 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1061 return 0; 1062 } 1063 1064 // C++ [class.union]p1: 1065 // A union shall not be used as a base class. 1066 if (BaseType->isUnionType()) { 1067 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1068 return 0; 1069 } 1070 1071 // C++ [class.derived]p2: 1072 // The class-name in a base-specifier shall not be an incompletely 1073 // defined class. 1074 if (RequireCompleteType(BaseLoc, BaseType, 1075 PDiag(diag::err_incomplete_base_class) 1076 << SpecifierRange)) { 1077 Class->setInvalidDecl(); 1078 return 0; 1079 } 1080 1081 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1082 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1083 assert(BaseDecl && "Record type has no declaration"); 1084 BaseDecl = BaseDecl->getDefinition(); 1085 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1086 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1087 assert(CXXBaseDecl && "Base type is not a C++ type"); 1088 1089 // C++ [class]p3: 1090 // If a class is marked final and it appears as a base-type-specifier in 1091 // base-clause, the program is ill-formed. 1092 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1093 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1094 << CXXBaseDecl->getDeclName(); 1095 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1096 << CXXBaseDecl->getDeclName(); 1097 return 0; 1098 } 1099 1100 if (BaseDecl->isInvalidDecl()) 1101 Class->setInvalidDecl(); 1102 1103 // Create the base specifier. 1104 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1105 Class->getTagKind() == TTK_Class, 1106 Access, TInfo, EllipsisLoc); 1107} 1108 1109/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1110/// one entry in the base class list of a class specifier, for 1111/// example: 1112/// class foo : public bar, virtual private baz { 1113/// 'public bar' and 'virtual private baz' are each base-specifiers. 1114BaseResult 1115Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1116 bool Virtual, AccessSpecifier Access, 1117 ParsedType basetype, SourceLocation BaseLoc, 1118 SourceLocation EllipsisLoc) { 1119 if (!classdecl) 1120 return true; 1121 1122 AdjustDeclIfTemplate(classdecl); 1123 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1124 if (!Class) 1125 return true; 1126 1127 TypeSourceInfo *TInfo = 0; 1128 GetTypeFromParser(basetype, &TInfo); 1129 1130 if (EllipsisLoc.isInvalid() && 1131 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1132 UPPC_BaseType)) 1133 return true; 1134 1135 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1136 Virtual, Access, TInfo, 1137 EllipsisLoc)) 1138 return BaseSpec; 1139 1140 return true; 1141} 1142 1143/// \brief Performs the actual work of attaching the given base class 1144/// specifiers to a C++ class. 1145bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1146 unsigned NumBases) { 1147 if (NumBases == 0) 1148 return false; 1149 1150 // Used to keep track of which base types we have already seen, so 1151 // that we can properly diagnose redundant direct base types. Note 1152 // that the key is always the unqualified canonical type of the base 1153 // class. 1154 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1155 1156 // Copy non-redundant base specifiers into permanent storage. 1157 unsigned NumGoodBases = 0; 1158 bool Invalid = false; 1159 for (unsigned idx = 0; idx < NumBases; ++idx) { 1160 QualType NewBaseType 1161 = Context.getCanonicalType(Bases[idx]->getType()); 1162 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1163 if (KnownBaseTypes[NewBaseType]) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getSourceRange().getBegin(), 1168 diag::err_duplicate_base_class) 1169 << KnownBaseTypes[NewBaseType]->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBaseTypes[NewBaseType] = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1182 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1183 if (RD->hasAttr<WeakAttr>()) 1184 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1185 } 1186 } 1187 1188 // Attach the remaining base class specifiers to the derived class. 1189 Class->setBases(Bases, NumGoodBases); 1190 1191 // Delete the remaining (good) base class specifiers, since their 1192 // data has been copied into the CXXRecordDecl. 1193 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1194 Context.Deallocate(Bases[idx]); 1195 1196 return Invalid; 1197} 1198 1199/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1200/// class, after checking whether there are any duplicate base 1201/// classes. 1202void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1203 unsigned NumBases) { 1204 if (!ClassDecl || !Bases || !NumBases) 1205 return; 1206 1207 AdjustDeclIfTemplate(ClassDecl); 1208 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1209 (CXXBaseSpecifier**)(Bases), NumBases); 1210} 1211 1212static CXXRecordDecl *GetClassForType(QualType T) { 1213 if (const RecordType *RT = T->getAs<RecordType>()) 1214 return cast<CXXRecordDecl>(RT->getDecl()); 1215 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1216 return ICT->getDecl(); 1217 else 1218 return 0; 1219} 1220 1221/// \brief Determine whether the type \p Derived is a C++ class that is 1222/// derived from the type \p Base. 1223bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1224 if (!getLangOptions().CPlusPlus) 1225 return false; 1226 1227 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1228 if (!DerivedRD) 1229 return false; 1230 1231 CXXRecordDecl *BaseRD = GetClassForType(Base); 1232 if (!BaseRD) 1233 return false; 1234 1235 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1236 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1237} 1238 1239/// \brief Determine whether the type \p Derived is a C++ class that is 1240/// derived from the type \p Base. 1241bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1242 if (!getLangOptions().CPlusPlus) 1243 return false; 1244 1245 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1246 if (!DerivedRD) 1247 return false; 1248 1249 CXXRecordDecl *BaseRD = GetClassForType(Base); 1250 if (!BaseRD) 1251 return false; 1252 1253 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1254} 1255 1256void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1257 CXXCastPath &BasePathArray) { 1258 assert(BasePathArray.empty() && "Base path array must be empty!"); 1259 assert(Paths.isRecordingPaths() && "Must record paths!"); 1260 1261 const CXXBasePath &Path = Paths.front(); 1262 1263 // We first go backward and check if we have a virtual base. 1264 // FIXME: It would be better if CXXBasePath had the base specifier for 1265 // the nearest virtual base. 1266 unsigned Start = 0; 1267 for (unsigned I = Path.size(); I != 0; --I) { 1268 if (Path[I - 1].Base->isVirtual()) { 1269 Start = I - 1; 1270 break; 1271 } 1272 } 1273 1274 // Now add all bases. 1275 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1276 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1277} 1278 1279/// \brief Determine whether the given base path includes a virtual 1280/// base class. 1281bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1282 for (CXXCastPath::const_iterator B = BasePath.begin(), 1283 BEnd = BasePath.end(); 1284 B != BEnd; ++B) 1285 if ((*B)->isVirtual()) 1286 return true; 1287 1288 return false; 1289} 1290 1291/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1292/// conversion (where Derived and Base are class types) is 1293/// well-formed, meaning that the conversion is unambiguous (and 1294/// that all of the base classes are accessible). Returns true 1295/// and emits a diagnostic if the code is ill-formed, returns false 1296/// otherwise. Loc is the location where this routine should point to 1297/// if there is an error, and Range is the source range to highlight 1298/// if there is an error. 1299bool 1300Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1301 unsigned InaccessibleBaseID, 1302 unsigned AmbigiousBaseConvID, 1303 SourceLocation Loc, SourceRange Range, 1304 DeclarationName Name, 1305 CXXCastPath *BasePath) { 1306 // First, determine whether the path from Derived to Base is 1307 // ambiguous. This is slightly more expensive than checking whether 1308 // the Derived to Base conversion exists, because here we need to 1309 // explore multiple paths to determine if there is an ambiguity. 1310 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1311 /*DetectVirtual=*/false); 1312 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1313 assert(DerivationOkay && 1314 "Can only be used with a derived-to-base conversion"); 1315 (void)DerivationOkay; 1316 1317 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1318 if (InaccessibleBaseID) { 1319 // Check that the base class can be accessed. 1320 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1321 InaccessibleBaseID)) { 1322 case AR_inaccessible: 1323 return true; 1324 case AR_accessible: 1325 case AR_dependent: 1326 case AR_delayed: 1327 break; 1328 } 1329 } 1330 1331 // Build a base path if necessary. 1332 if (BasePath) 1333 BuildBasePathArray(Paths, *BasePath); 1334 return false; 1335 } 1336 1337 // We know that the derived-to-base conversion is ambiguous, and 1338 // we're going to produce a diagnostic. Perform the derived-to-base 1339 // search just one more time to compute all of the possible paths so 1340 // that we can print them out. This is more expensive than any of 1341 // the previous derived-to-base checks we've done, but at this point 1342 // performance isn't as much of an issue. 1343 Paths.clear(); 1344 Paths.setRecordingPaths(true); 1345 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1346 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1347 (void)StillOkay; 1348 1349 // Build up a textual representation of the ambiguous paths, e.g., 1350 // D -> B -> A, that will be used to illustrate the ambiguous 1351 // conversions in the diagnostic. We only print one of the paths 1352 // to each base class subobject. 1353 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1354 1355 Diag(Loc, AmbigiousBaseConvID) 1356 << Derived << Base << PathDisplayStr << Range << Name; 1357 return true; 1358} 1359 1360bool 1361Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1362 SourceLocation Loc, SourceRange Range, 1363 CXXCastPath *BasePath, 1364 bool IgnoreAccess) { 1365 return CheckDerivedToBaseConversion(Derived, Base, 1366 IgnoreAccess ? 0 1367 : diag::err_upcast_to_inaccessible_base, 1368 diag::err_ambiguous_derived_to_base_conv, 1369 Loc, Range, DeclarationName(), 1370 BasePath); 1371} 1372 1373 1374/// @brief Builds a string representing ambiguous paths from a 1375/// specific derived class to different subobjects of the same base 1376/// class. 1377/// 1378/// This function builds a string that can be used in error messages 1379/// to show the different paths that one can take through the 1380/// inheritance hierarchy to go from the derived class to different 1381/// subobjects of a base class. The result looks something like this: 1382/// @code 1383/// struct D -> struct B -> struct A 1384/// struct D -> struct C -> struct A 1385/// @endcode 1386std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1387 std::string PathDisplayStr; 1388 std::set<unsigned> DisplayedPaths; 1389 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1390 Path != Paths.end(); ++Path) { 1391 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1392 // We haven't displayed a path to this particular base 1393 // class subobject yet. 1394 PathDisplayStr += "\n "; 1395 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1396 for (CXXBasePath::const_iterator Element = Path->begin(); 1397 Element != Path->end(); ++Element) 1398 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1399 } 1400 } 1401 1402 return PathDisplayStr; 1403} 1404 1405//===----------------------------------------------------------------------===// 1406// C++ class member Handling 1407//===----------------------------------------------------------------------===// 1408 1409/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1410bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1411 SourceLocation ASLoc, 1412 SourceLocation ColonLoc, 1413 AttributeList *Attrs) { 1414 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1415 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1416 ASLoc, ColonLoc); 1417 CurContext->addHiddenDecl(ASDecl); 1418 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1419} 1420 1421/// CheckOverrideControl - Check C++0x override control semantics. 1422void Sema::CheckOverrideControl(const Decl *D) { 1423 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1424 if (!MD || !MD->isVirtual()) 1425 return; 1426 1427 if (MD->isDependentContext()) 1428 return; 1429 1430 // C++0x [class.virtual]p3: 1431 // If a virtual function is marked with the virt-specifier override and does 1432 // not override a member function of a base class, 1433 // the program is ill-formed. 1434 bool HasOverriddenMethods = 1435 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1436 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1437 Diag(MD->getLocation(), 1438 diag::err_function_marked_override_not_overriding) 1439 << MD->getDeclName(); 1440 return; 1441 } 1442} 1443 1444/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1445/// function overrides a virtual member function marked 'final', according to 1446/// C++0x [class.virtual]p3. 1447bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1448 const CXXMethodDecl *Old) { 1449 if (!Old->hasAttr<FinalAttr>()) 1450 return false; 1451 1452 Diag(New->getLocation(), diag::err_final_function_overridden) 1453 << New->getDeclName(); 1454 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1455 return true; 1456} 1457 1458/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1459/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1460/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1461/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1462/// present but parsing it has been deferred. 1463Decl * 1464Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1465 MultiTemplateParamsArg TemplateParameterLists, 1466 Expr *BW, const VirtSpecifiers &VS, 1467 bool HasDeferredInit) { 1468 const DeclSpec &DS = D.getDeclSpec(); 1469 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1470 DeclarationName Name = NameInfo.getName(); 1471 SourceLocation Loc = NameInfo.getLoc(); 1472 1473 // For anonymous bitfields, the location should point to the type. 1474 if (Loc.isInvalid()) 1475 Loc = D.getSourceRange().getBegin(); 1476 1477 Expr *BitWidth = static_cast<Expr*>(BW); 1478 1479 assert(isa<CXXRecordDecl>(CurContext)); 1480 assert(!DS.isFriendSpecified()); 1481 1482 bool isFunc = D.isDeclarationOfFunction(); 1483 1484 // C++ 9.2p6: A member shall not be declared to have automatic storage 1485 // duration (auto, register) or with the extern storage-class-specifier. 1486 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1487 // data members and cannot be applied to names declared const or static, 1488 // and cannot be applied to reference members. 1489 switch (DS.getStorageClassSpec()) { 1490 case DeclSpec::SCS_unspecified: 1491 case DeclSpec::SCS_typedef: 1492 case DeclSpec::SCS_static: 1493 // FALL THROUGH. 1494 break; 1495 case DeclSpec::SCS_mutable: 1496 if (isFunc) { 1497 if (DS.getStorageClassSpecLoc().isValid()) 1498 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1499 else 1500 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1501 1502 // FIXME: It would be nicer if the keyword was ignored only for this 1503 // declarator. Otherwise we could get follow-up errors. 1504 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1505 } 1506 break; 1507 default: 1508 if (DS.getStorageClassSpecLoc().isValid()) 1509 Diag(DS.getStorageClassSpecLoc(), 1510 diag::err_storageclass_invalid_for_member); 1511 else 1512 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1513 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1514 } 1515 1516 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1517 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1518 !isFunc); 1519 1520 Decl *Member; 1521 if (isInstField) { 1522 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1523 1524 // Data members must have identifiers for names. 1525 if (Name.getNameKind() != DeclarationName::Identifier) { 1526 Diag(Loc, diag::err_bad_variable_name) 1527 << Name; 1528 return 0; 1529 } 1530 1531 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1532 1533 // Member field could not be with "template" keyword. 1534 // So TemplateParameterLists should be empty in this case. 1535 if (TemplateParameterLists.size()) { 1536 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1537 if (TemplateParams->size()) { 1538 // There is no such thing as a member field template. 1539 Diag(D.getIdentifierLoc(), diag::err_template_member) 1540 << II 1541 << SourceRange(TemplateParams->getTemplateLoc(), 1542 TemplateParams->getRAngleLoc()); 1543 } else { 1544 // There is an extraneous 'template<>' for this member. 1545 Diag(TemplateParams->getTemplateLoc(), 1546 diag::err_template_member_noparams) 1547 << II 1548 << SourceRange(TemplateParams->getTemplateLoc(), 1549 TemplateParams->getRAngleLoc()); 1550 } 1551 return 0; 1552 } 1553 1554 if (SS.isSet() && !SS.isInvalid()) { 1555 // The user provided a superfluous scope specifier inside a class 1556 // definition: 1557 // 1558 // class X { 1559 // int X::member; 1560 // }; 1561 DeclContext *DC = 0; 1562 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1563 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1564 << Name << FixItHint::CreateRemoval(SS.getRange()); 1565 else 1566 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1567 << Name << SS.getRange(); 1568 1569 SS.clear(); 1570 } 1571 1572 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1573 HasDeferredInit, AS); 1574 assert(Member && "HandleField never returns null"); 1575 } else { 1576 assert(!HasDeferredInit); 1577 1578 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1579 if (!Member) { 1580 return 0; 1581 } 1582 1583 // Non-instance-fields can't have a bitfield. 1584 if (BitWidth) { 1585 if (Member->isInvalidDecl()) { 1586 // don't emit another diagnostic. 1587 } else if (isa<VarDecl>(Member)) { 1588 // C++ 9.6p3: A bit-field shall not be a static member. 1589 // "static member 'A' cannot be a bit-field" 1590 Diag(Loc, diag::err_static_not_bitfield) 1591 << Name << BitWidth->getSourceRange(); 1592 } else if (isa<TypedefDecl>(Member)) { 1593 // "typedef member 'x' cannot be a bit-field" 1594 Diag(Loc, diag::err_typedef_not_bitfield) 1595 << Name << BitWidth->getSourceRange(); 1596 } else { 1597 // A function typedef ("typedef int f(); f a;"). 1598 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1599 Diag(Loc, diag::err_not_integral_type_bitfield) 1600 << Name << cast<ValueDecl>(Member)->getType() 1601 << BitWidth->getSourceRange(); 1602 } 1603 1604 BitWidth = 0; 1605 Member->setInvalidDecl(); 1606 } 1607 1608 Member->setAccess(AS); 1609 1610 // If we have declared a member function template, set the access of the 1611 // templated declaration as well. 1612 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1613 FunTmpl->getTemplatedDecl()->setAccess(AS); 1614 } 1615 1616 if (VS.isOverrideSpecified()) { 1617 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1618 if (!MD || !MD->isVirtual()) { 1619 Diag(Member->getLocStart(), 1620 diag::override_keyword_only_allowed_on_virtual_member_functions) 1621 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1622 } else 1623 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1624 } 1625 if (VS.isFinalSpecified()) { 1626 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1627 if (!MD || !MD->isVirtual()) { 1628 Diag(Member->getLocStart(), 1629 diag::override_keyword_only_allowed_on_virtual_member_functions) 1630 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1631 } else 1632 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1633 } 1634 1635 if (VS.getLastLocation().isValid()) { 1636 // Update the end location of a method that has a virt-specifiers. 1637 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1638 MD->setRangeEnd(VS.getLastLocation()); 1639 } 1640 1641 CheckOverrideControl(Member); 1642 1643 assert((Name || isInstField) && "No identifier for non-field ?"); 1644 1645 if (isInstField) 1646 FieldCollector->Add(cast<FieldDecl>(Member)); 1647 return Member; 1648} 1649 1650/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1651/// in-class initializer for a non-static C++ class member, and after 1652/// instantiating an in-class initializer in a class template. Such actions 1653/// are deferred until the class is complete. 1654void 1655Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1656 Expr *InitExpr) { 1657 FieldDecl *FD = cast<FieldDecl>(D); 1658 1659 if (!InitExpr) { 1660 FD->setInvalidDecl(); 1661 FD->removeInClassInitializer(); 1662 return; 1663 } 1664 1665 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1666 FD->setInvalidDecl(); 1667 FD->removeInClassInitializer(); 1668 return; 1669 } 1670 1671 ExprResult Init = InitExpr; 1672 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1673 // FIXME: if there is no EqualLoc, this is list-initialization. 1674 Init = PerformCopyInitialization( 1675 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1676 if (Init.isInvalid()) { 1677 FD->setInvalidDecl(); 1678 return; 1679 } 1680 1681 CheckImplicitConversions(Init.get(), EqualLoc); 1682 } 1683 1684 // C++0x [class.base.init]p7: 1685 // The initialization of each base and member constitutes a 1686 // full-expression. 1687 Init = MaybeCreateExprWithCleanups(Init); 1688 if (Init.isInvalid()) { 1689 FD->setInvalidDecl(); 1690 return; 1691 } 1692 1693 InitExpr = Init.release(); 1694 1695 FD->setInClassInitializer(InitExpr); 1696} 1697 1698/// \brief Find the direct and/or virtual base specifiers that 1699/// correspond to the given base type, for use in base initialization 1700/// within a constructor. 1701static bool FindBaseInitializer(Sema &SemaRef, 1702 CXXRecordDecl *ClassDecl, 1703 QualType BaseType, 1704 const CXXBaseSpecifier *&DirectBaseSpec, 1705 const CXXBaseSpecifier *&VirtualBaseSpec) { 1706 // First, check for a direct base class. 1707 DirectBaseSpec = 0; 1708 for (CXXRecordDecl::base_class_const_iterator Base 1709 = ClassDecl->bases_begin(); 1710 Base != ClassDecl->bases_end(); ++Base) { 1711 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1712 // We found a direct base of this type. That's what we're 1713 // initializing. 1714 DirectBaseSpec = &*Base; 1715 break; 1716 } 1717 } 1718 1719 // Check for a virtual base class. 1720 // FIXME: We might be able to short-circuit this if we know in advance that 1721 // there are no virtual bases. 1722 VirtualBaseSpec = 0; 1723 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1724 // We haven't found a base yet; search the class hierarchy for a 1725 // virtual base class. 1726 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1727 /*DetectVirtual=*/false); 1728 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1729 BaseType, Paths)) { 1730 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1731 Path != Paths.end(); ++Path) { 1732 if (Path->back().Base->isVirtual()) { 1733 VirtualBaseSpec = Path->back().Base; 1734 break; 1735 } 1736 } 1737 } 1738 } 1739 1740 return DirectBaseSpec || VirtualBaseSpec; 1741} 1742 1743/// \brief Handle a C++ member initializer using braced-init-list syntax. 1744MemInitResult 1745Sema::ActOnMemInitializer(Decl *ConstructorD, 1746 Scope *S, 1747 CXXScopeSpec &SS, 1748 IdentifierInfo *MemberOrBase, 1749 ParsedType TemplateTypeTy, 1750 const DeclSpec &DS, 1751 SourceLocation IdLoc, 1752 Expr *InitList, 1753 SourceLocation EllipsisLoc) { 1754 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1755 DS, IdLoc, MultiInitializer(InitList), 1756 EllipsisLoc); 1757} 1758 1759/// \brief Handle a C++ member initializer using parentheses syntax. 1760MemInitResult 1761Sema::ActOnMemInitializer(Decl *ConstructorD, 1762 Scope *S, 1763 CXXScopeSpec &SS, 1764 IdentifierInfo *MemberOrBase, 1765 ParsedType TemplateTypeTy, 1766 const DeclSpec &DS, 1767 SourceLocation IdLoc, 1768 SourceLocation LParenLoc, 1769 Expr **Args, unsigned NumArgs, 1770 SourceLocation RParenLoc, 1771 SourceLocation EllipsisLoc) { 1772 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1773 DS, IdLoc, MultiInitializer(LParenLoc, Args, 1774 NumArgs, RParenLoc), 1775 EllipsisLoc); 1776} 1777 1778namespace { 1779 1780// Callback to only accept typo corrections that can be a valid C++ member 1781// intializer: either a non-static field member or a base class. 1782class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1783 public: 1784 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1785 : ClassDecl(ClassDecl) {} 1786 1787 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1788 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1789 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1790 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1791 else 1792 return isa<TypeDecl>(ND); 1793 } 1794 return false; 1795 } 1796 1797 private: 1798 CXXRecordDecl *ClassDecl; 1799}; 1800 1801} 1802 1803/// \brief Handle a C++ member initializer. 1804MemInitResult 1805Sema::BuildMemInitializer(Decl *ConstructorD, 1806 Scope *S, 1807 CXXScopeSpec &SS, 1808 IdentifierInfo *MemberOrBase, 1809 ParsedType TemplateTypeTy, 1810 const DeclSpec &DS, 1811 SourceLocation IdLoc, 1812 const MultiInitializer &Args, 1813 SourceLocation EllipsisLoc) { 1814 if (!ConstructorD) 1815 return true; 1816 1817 AdjustDeclIfTemplate(ConstructorD); 1818 1819 CXXConstructorDecl *Constructor 1820 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1821 if (!Constructor) { 1822 // The user wrote a constructor initializer on a function that is 1823 // not a C++ constructor. Ignore the error for now, because we may 1824 // have more member initializers coming; we'll diagnose it just 1825 // once in ActOnMemInitializers. 1826 return true; 1827 } 1828 1829 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1830 1831 // C++ [class.base.init]p2: 1832 // Names in a mem-initializer-id are looked up in the scope of the 1833 // constructor's class and, if not found in that scope, are looked 1834 // up in the scope containing the constructor's definition. 1835 // [Note: if the constructor's class contains a member with the 1836 // same name as a direct or virtual base class of the class, a 1837 // mem-initializer-id naming the member or base class and composed 1838 // of a single identifier refers to the class member. A 1839 // mem-initializer-id for the hidden base class may be specified 1840 // using a qualified name. ] 1841 if (!SS.getScopeRep() && !TemplateTypeTy) { 1842 // Look for a member, first. 1843 DeclContext::lookup_result Result 1844 = ClassDecl->lookup(MemberOrBase); 1845 if (Result.first != Result.second) { 1846 ValueDecl *Member; 1847 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1848 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1849 if (EllipsisLoc.isValid()) 1850 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1851 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1852 1853 return BuildMemberInitializer(Member, Args, IdLoc); 1854 } 1855 } 1856 } 1857 // It didn't name a member, so see if it names a class. 1858 QualType BaseType; 1859 TypeSourceInfo *TInfo = 0; 1860 1861 if (TemplateTypeTy) { 1862 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1863 } else if (DS.getTypeSpecType() == TST_decltype) { 1864 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1865 } else { 1866 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1867 LookupParsedName(R, S, &SS); 1868 1869 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1870 if (!TyD) { 1871 if (R.isAmbiguous()) return true; 1872 1873 // We don't want access-control diagnostics here. 1874 R.suppressDiagnostics(); 1875 1876 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1877 bool NotUnknownSpecialization = false; 1878 DeclContext *DC = computeDeclContext(SS, false); 1879 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1880 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1881 1882 if (!NotUnknownSpecialization) { 1883 // When the scope specifier can refer to a member of an unknown 1884 // specialization, we take it as a type name. 1885 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1886 SS.getWithLocInContext(Context), 1887 *MemberOrBase, IdLoc); 1888 if (BaseType.isNull()) 1889 return true; 1890 1891 R.clear(); 1892 R.setLookupName(MemberOrBase); 1893 } 1894 } 1895 1896 // If no results were found, try to correct typos. 1897 TypoCorrection Corr; 1898 MemInitializerValidatorCCC Validator(ClassDecl); 1899 if (R.empty() && BaseType.isNull() && 1900 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1901 Validator, ClassDecl))) { 1902 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1903 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1904 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1905 // We have found a non-static data member with a similar 1906 // name to what was typed; complain and initialize that 1907 // member. 1908 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1909 << MemberOrBase << true << CorrectedQuotedStr 1910 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1911 Diag(Member->getLocation(), diag::note_previous_decl) 1912 << CorrectedQuotedStr; 1913 1914 return BuildMemberInitializer(Member, Args, IdLoc); 1915 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1916 const CXXBaseSpecifier *DirectBaseSpec; 1917 const CXXBaseSpecifier *VirtualBaseSpec; 1918 if (FindBaseInitializer(*this, ClassDecl, 1919 Context.getTypeDeclType(Type), 1920 DirectBaseSpec, VirtualBaseSpec)) { 1921 // We have found a direct or virtual base class with a 1922 // similar name to what was typed; complain and initialize 1923 // that base class. 1924 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1925 << MemberOrBase << false << CorrectedQuotedStr 1926 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1927 1928 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1929 : VirtualBaseSpec; 1930 Diag(BaseSpec->getSourceRange().getBegin(), 1931 diag::note_base_class_specified_here) 1932 << BaseSpec->getType() 1933 << BaseSpec->getSourceRange(); 1934 1935 TyD = Type; 1936 } 1937 } 1938 } 1939 1940 if (!TyD && BaseType.isNull()) { 1941 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1942 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1943 return true; 1944 } 1945 } 1946 1947 if (BaseType.isNull()) { 1948 BaseType = Context.getTypeDeclType(TyD); 1949 if (SS.isSet()) { 1950 NestedNameSpecifier *Qualifier = 1951 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1952 1953 // FIXME: preserve source range information 1954 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1955 } 1956 } 1957 } 1958 1959 if (!TInfo) 1960 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1961 1962 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1963} 1964 1965/// Checks a member initializer expression for cases where reference (or 1966/// pointer) members are bound to by-value parameters (or their addresses). 1967static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1968 Expr *Init, 1969 SourceLocation IdLoc) { 1970 QualType MemberTy = Member->getType(); 1971 1972 // We only handle pointers and references currently. 1973 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1974 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1975 return; 1976 1977 const bool IsPointer = MemberTy->isPointerType(); 1978 if (IsPointer) { 1979 if (const UnaryOperator *Op 1980 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1981 // The only case we're worried about with pointers requires taking the 1982 // address. 1983 if (Op->getOpcode() != UO_AddrOf) 1984 return; 1985 1986 Init = Op->getSubExpr(); 1987 } else { 1988 // We only handle address-of expression initializers for pointers. 1989 return; 1990 } 1991 } 1992 1993 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1994 // Taking the address of a temporary will be diagnosed as a hard error. 1995 if (IsPointer) 1996 return; 1997 1998 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1999 << Member << Init->getSourceRange(); 2000 } else if (const DeclRefExpr *DRE 2001 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2002 // We only warn when referring to a non-reference parameter declaration. 2003 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2004 if (!Parameter || Parameter->getType()->isReferenceType()) 2005 return; 2006 2007 S.Diag(Init->getExprLoc(), 2008 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2009 : diag::warn_bind_ref_member_to_parameter) 2010 << Member << Parameter << Init->getSourceRange(); 2011 } else { 2012 // Other initializers are fine. 2013 return; 2014 } 2015 2016 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2017 << (unsigned)IsPointer; 2018} 2019 2020/// Checks an initializer expression for use of uninitialized fields, such as 2021/// containing the field that is being initialized. Returns true if there is an 2022/// uninitialized field was used an updates the SourceLocation parameter; false 2023/// otherwise. 2024static bool InitExprContainsUninitializedFields(const Stmt *S, 2025 const ValueDecl *LhsField, 2026 SourceLocation *L) { 2027 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2028 2029 if (isa<CallExpr>(S)) { 2030 // Do not descend into function calls or constructors, as the use 2031 // of an uninitialized field may be valid. One would have to inspect 2032 // the contents of the function/ctor to determine if it is safe or not. 2033 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2034 // may be safe, depending on what the function/ctor does. 2035 return false; 2036 } 2037 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2038 const NamedDecl *RhsField = ME->getMemberDecl(); 2039 2040 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2041 // The member expression points to a static data member. 2042 assert(VD->isStaticDataMember() && 2043 "Member points to non-static data member!"); 2044 (void)VD; 2045 return false; 2046 } 2047 2048 if (isa<EnumConstantDecl>(RhsField)) { 2049 // The member expression points to an enum. 2050 return false; 2051 } 2052 2053 if (RhsField == LhsField) { 2054 // Initializing a field with itself. Throw a warning. 2055 // But wait; there are exceptions! 2056 // Exception #1: The field may not belong to this record. 2057 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2058 const Expr *base = ME->getBase(); 2059 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2060 // Even though the field matches, it does not belong to this record. 2061 return false; 2062 } 2063 // None of the exceptions triggered; return true to indicate an 2064 // uninitialized field was used. 2065 *L = ME->getMemberLoc(); 2066 return true; 2067 } 2068 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2069 // sizeof/alignof doesn't reference contents, do not warn. 2070 return false; 2071 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2072 // address-of doesn't reference contents (the pointer may be dereferenced 2073 // in the same expression but it would be rare; and weird). 2074 if (UOE->getOpcode() == UO_AddrOf) 2075 return false; 2076 } 2077 for (Stmt::const_child_range it = S->children(); it; ++it) { 2078 if (!*it) { 2079 // An expression such as 'member(arg ?: "")' may trigger this. 2080 continue; 2081 } 2082 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2083 return true; 2084 } 2085 return false; 2086} 2087 2088MemInitResult 2089Sema::BuildMemberInitializer(ValueDecl *Member, 2090 const MultiInitializer &Args, 2091 SourceLocation IdLoc) { 2092 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2093 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2094 assert((DirectMember || IndirectMember) && 2095 "Member must be a FieldDecl or IndirectFieldDecl"); 2096 2097 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2098 return true; 2099 2100 if (Member->isInvalidDecl()) 2101 return true; 2102 2103 // Diagnose value-uses of fields to initialize themselves, e.g. 2104 // foo(foo) 2105 // where foo is not also a parameter to the constructor. 2106 // TODO: implement -Wuninitialized and fold this into that framework. 2107 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2108 I != E; ++I) { 2109 SourceLocation L; 2110 Expr *Arg = *I; 2111 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2112 Arg = DIE->getInit(); 2113 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2114 // FIXME: Return true in the case when other fields are used before being 2115 // uninitialized. For example, let this field be the i'th field. When 2116 // initializing the i'th field, throw a warning if any of the >= i'th 2117 // fields are used, as they are not yet initialized. 2118 // Right now we are only handling the case where the i'th field uses 2119 // itself in its initializer. 2120 Diag(L, diag::warn_field_is_uninit); 2121 } 2122 } 2123 2124 bool HasDependentArg = Args.isTypeDependent(); 2125 2126 Expr *Init; 2127 if (Member->getType()->isDependentType() || HasDependentArg) { 2128 // Can't check initialization for a member of dependent type or when 2129 // any of the arguments are type-dependent expressions. 2130 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2131 2132 DiscardCleanupsInEvaluationContext(); 2133 } else { 2134 // Initialize the member. 2135 InitializedEntity MemberEntity = 2136 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2137 : InitializedEntity::InitializeMember(IndirectMember, 0); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2143 if (MemberInit.isInvalid()) 2144 return true; 2145 2146 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2147 2148 // C++0x [class.base.init]p7: 2149 // The initialization of each base and member constitutes a 2150 // full-expression. 2151 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2152 if (MemberInit.isInvalid()) 2153 return true; 2154 2155 // If we are in a dependent context, template instantiation will 2156 // perform this type-checking again. Just save the arguments that we 2157 // received in a ParenListExpr. 2158 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2159 // of the information that we have about the member 2160 // initializer. However, deconstructing the ASTs is a dicey process, 2161 // and this approach is far more likely to get the corner cases right. 2162 if (CurContext->isDependentContext()) { 2163 Init = Args.CreateInitExpr(Context, 2164 Member->getType().getNonReferenceType()); 2165 } else { 2166 Init = MemberInit.get(); 2167 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2168 } 2169 } 2170 2171 if (DirectMember) { 2172 return new (Context) CXXCtorInitializer(Context, DirectMember, 2173 IdLoc, Args.getStartLoc(), 2174 Init, Args.getEndLoc()); 2175 } else { 2176 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2177 IdLoc, Args.getStartLoc(), 2178 Init, Args.getEndLoc()); 2179 } 2180} 2181 2182MemInitResult 2183Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2184 const MultiInitializer &Args, 2185 CXXRecordDecl *ClassDecl) { 2186 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2187 if (!LangOpts.CPlusPlus0x) 2188 return Diag(NameLoc, diag::err_delegating_ctor) 2189 << TInfo->getTypeLoc().getLocalSourceRange(); 2190 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2191 2192 // Initialize the object. 2193 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2194 QualType(ClassDecl->getTypeForDecl(), 0)); 2195 InitializationKind Kind = 2196 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2197 Args.getEndLoc()); 2198 2199 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2200 if (DelegationInit.isInvalid()) 2201 return true; 2202 2203 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2204 "Delegating constructor with no target?"); 2205 2206 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2207 2208 // C++0x [class.base.init]p7: 2209 // The initialization of each base and member constitutes a 2210 // full-expression. 2211 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2212 if (DelegationInit.isInvalid()) 2213 return true; 2214 2215 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2216 DelegationInit.takeAs<Expr>(), 2217 Args.getEndLoc()); 2218} 2219 2220MemInitResult 2221Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2222 const MultiInitializer &Args, 2223 CXXRecordDecl *ClassDecl, 2224 SourceLocation EllipsisLoc) { 2225 bool HasDependentArg = Args.isTypeDependent(); 2226 2227 SourceLocation BaseLoc 2228 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2229 2230 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2231 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2232 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2233 2234 // C++ [class.base.init]p2: 2235 // [...] Unless the mem-initializer-id names a nonstatic data 2236 // member of the constructor's class or a direct or virtual base 2237 // of that class, the mem-initializer is ill-formed. A 2238 // mem-initializer-list can initialize a base class using any 2239 // name that denotes that base class type. 2240 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2241 2242 if (EllipsisLoc.isValid()) { 2243 // This is a pack expansion. 2244 if (!BaseType->containsUnexpandedParameterPack()) { 2245 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2246 << SourceRange(BaseLoc, Args.getEndLoc()); 2247 2248 EllipsisLoc = SourceLocation(); 2249 } 2250 } else { 2251 // Check for any unexpanded parameter packs. 2252 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2253 return true; 2254 2255 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2256 return true; 2257 } 2258 2259 // Check for direct and virtual base classes. 2260 const CXXBaseSpecifier *DirectBaseSpec = 0; 2261 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2262 if (!Dependent) { 2263 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2264 BaseType)) 2265 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2266 2267 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2268 VirtualBaseSpec); 2269 2270 // C++ [base.class.init]p2: 2271 // Unless the mem-initializer-id names a nonstatic data member of the 2272 // constructor's class or a direct or virtual base of that class, the 2273 // mem-initializer is ill-formed. 2274 if (!DirectBaseSpec && !VirtualBaseSpec) { 2275 // If the class has any dependent bases, then it's possible that 2276 // one of those types will resolve to the same type as 2277 // BaseType. Therefore, just treat this as a dependent base 2278 // class initialization. FIXME: Should we try to check the 2279 // initialization anyway? It seems odd. 2280 if (ClassDecl->hasAnyDependentBases()) 2281 Dependent = true; 2282 else 2283 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2284 << BaseType << Context.getTypeDeclType(ClassDecl) 2285 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2286 } 2287 } 2288 2289 if (Dependent) { 2290 // Can't check initialization for a base of dependent type or when 2291 // any of the arguments are type-dependent expressions. 2292 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2293 2294 DiscardCleanupsInEvaluationContext(); 2295 2296 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2297 /*IsVirtual=*/false, 2298 Args.getStartLoc(), BaseInit, 2299 Args.getEndLoc(), EllipsisLoc); 2300 } 2301 2302 // C++ [base.class.init]p2: 2303 // If a mem-initializer-id is ambiguous because it designates both 2304 // a direct non-virtual base class and an inherited virtual base 2305 // class, the mem-initializer is ill-formed. 2306 if (DirectBaseSpec && VirtualBaseSpec) 2307 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2308 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2309 2310 CXXBaseSpecifier *BaseSpec 2311 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2312 if (!BaseSpec) 2313 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2314 2315 // Initialize the base. 2316 InitializedEntity BaseEntity = 2317 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2318 InitializationKind Kind = 2319 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2320 Args.getEndLoc()); 2321 2322 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2323 if (BaseInit.isInvalid()) 2324 return true; 2325 2326 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2327 2328 // C++0x [class.base.init]p7: 2329 // The initialization of each base and member constitutes a 2330 // full-expression. 2331 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2332 if (BaseInit.isInvalid()) 2333 return true; 2334 2335 // If we are in a dependent context, template instantiation will 2336 // perform this type-checking again. Just save the arguments that we 2337 // received in a ParenListExpr. 2338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2339 // of the information that we have about the base 2340 // initializer. However, deconstructing the ASTs is a dicey process, 2341 // and this approach is far more likely to get the corner cases right. 2342 if (CurContext->isDependentContext()) 2343 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2344 2345 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2346 BaseSpec->isVirtual(), 2347 Args.getStartLoc(), 2348 BaseInit.takeAs<Expr>(), 2349 Args.getEndLoc(), EllipsisLoc); 2350} 2351 2352// Create a static_cast\<T&&>(expr). 2353static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2354 QualType ExprType = E->getType(); 2355 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2356 SourceLocation ExprLoc = E->getLocStart(); 2357 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2358 TargetType, ExprLoc); 2359 2360 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2361 SourceRange(ExprLoc, ExprLoc), 2362 E->getSourceRange()).take(); 2363} 2364 2365/// ImplicitInitializerKind - How an implicit base or member initializer should 2366/// initialize its base or member. 2367enum ImplicitInitializerKind { 2368 IIK_Default, 2369 IIK_Copy, 2370 IIK_Move 2371}; 2372 2373static bool 2374BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2375 ImplicitInitializerKind ImplicitInitKind, 2376 CXXBaseSpecifier *BaseSpec, 2377 bool IsInheritedVirtualBase, 2378 CXXCtorInitializer *&CXXBaseInit) { 2379 InitializedEntity InitEntity 2380 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2381 IsInheritedVirtualBase); 2382 2383 ExprResult BaseInit; 2384 2385 switch (ImplicitInitKind) { 2386 case IIK_Default: { 2387 InitializationKind InitKind 2388 = InitializationKind::CreateDefault(Constructor->getLocation()); 2389 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2390 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2391 MultiExprArg(SemaRef, 0, 0)); 2392 break; 2393 } 2394 2395 case IIK_Move: 2396 case IIK_Copy: { 2397 bool Moving = ImplicitInitKind == IIK_Move; 2398 ParmVarDecl *Param = Constructor->getParamDecl(0); 2399 QualType ParamType = Param->getType().getNonReferenceType(); 2400 2401 Expr *CopyCtorArg = 2402 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2403 SourceLocation(), Param, 2404 Constructor->getLocation(), ParamType, 2405 VK_LValue, 0); 2406 2407 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2408 2409 // Cast to the base class to avoid ambiguities. 2410 QualType ArgTy = 2411 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2412 ParamType.getQualifiers()); 2413 2414 if (Moving) { 2415 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2416 } 2417 2418 CXXCastPath BasePath; 2419 BasePath.push_back(BaseSpec); 2420 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2421 CK_UncheckedDerivedToBase, 2422 Moving ? VK_XValue : VK_LValue, 2423 &BasePath).take(); 2424 2425 InitializationKind InitKind 2426 = InitializationKind::CreateDirect(Constructor->getLocation(), 2427 SourceLocation(), SourceLocation()); 2428 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2429 &CopyCtorArg, 1); 2430 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2431 MultiExprArg(&CopyCtorArg, 1)); 2432 break; 2433 } 2434 } 2435 2436 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2437 if (BaseInit.isInvalid()) 2438 return true; 2439 2440 CXXBaseInit = 2441 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2442 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2443 SourceLocation()), 2444 BaseSpec->isVirtual(), 2445 SourceLocation(), 2446 BaseInit.takeAs<Expr>(), 2447 SourceLocation(), 2448 SourceLocation()); 2449 2450 return false; 2451} 2452 2453static bool RefersToRValueRef(Expr *MemRef) { 2454 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2455 return Referenced->getType()->isRValueReferenceType(); 2456} 2457 2458static bool 2459BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2460 ImplicitInitializerKind ImplicitInitKind, 2461 FieldDecl *Field, IndirectFieldDecl *Indirect, 2462 CXXCtorInitializer *&CXXMemberInit) { 2463 if (Field->isInvalidDecl()) 2464 return true; 2465 2466 SourceLocation Loc = Constructor->getLocation(); 2467 2468 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2469 bool Moving = ImplicitInitKind == IIK_Move; 2470 ParmVarDecl *Param = Constructor->getParamDecl(0); 2471 QualType ParamType = Param->getType().getNonReferenceType(); 2472 2473 // Suppress copying zero-width bitfields. 2474 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2475 return false; 2476 2477 Expr *MemberExprBase = 2478 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2479 SourceLocation(), Param, 2480 Loc, ParamType, VK_LValue, 0); 2481 2482 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2483 2484 if (Moving) { 2485 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2486 } 2487 2488 // Build a reference to this field within the parameter. 2489 CXXScopeSpec SS; 2490 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2491 Sema::LookupMemberName); 2492 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2493 : cast<ValueDecl>(Field), AS_public); 2494 MemberLookup.resolveKind(); 2495 ExprResult CtorArg 2496 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2497 ParamType, Loc, 2498 /*IsArrow=*/false, 2499 SS, 2500 /*TemplateKWLoc=*/SourceLocation(), 2501 /*FirstQualifierInScope=*/0, 2502 MemberLookup, 2503 /*TemplateArgs=*/0); 2504 if (CtorArg.isInvalid()) 2505 return true; 2506 2507 // C++11 [class.copy]p15: 2508 // - if a member m has rvalue reference type T&&, it is direct-initialized 2509 // with static_cast<T&&>(x.m); 2510 if (RefersToRValueRef(CtorArg.get())) { 2511 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2512 } 2513 2514 // When the field we are copying is an array, create index variables for 2515 // each dimension of the array. We use these index variables to subscript 2516 // the source array, and other clients (e.g., CodeGen) will perform the 2517 // necessary iteration with these index variables. 2518 SmallVector<VarDecl *, 4> IndexVariables; 2519 QualType BaseType = Field->getType(); 2520 QualType SizeType = SemaRef.Context.getSizeType(); 2521 bool InitializingArray = false; 2522 while (const ConstantArrayType *Array 2523 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2524 InitializingArray = true; 2525 // Create the iteration variable for this array index. 2526 IdentifierInfo *IterationVarName = 0; 2527 { 2528 llvm::SmallString<8> Str; 2529 llvm::raw_svector_ostream OS(Str); 2530 OS << "__i" << IndexVariables.size(); 2531 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2532 } 2533 VarDecl *IterationVar 2534 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2535 IterationVarName, SizeType, 2536 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2537 SC_None, SC_None); 2538 IndexVariables.push_back(IterationVar); 2539 2540 // Create a reference to the iteration variable. 2541 ExprResult IterationVarRef 2542 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2543 assert(!IterationVarRef.isInvalid() && 2544 "Reference to invented variable cannot fail!"); 2545 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2546 assert(!IterationVarRef.isInvalid() && 2547 "Conversion of invented variable cannot fail!"); 2548 2549 // Subscript the array with this iteration variable. 2550 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2551 IterationVarRef.take(), 2552 Loc); 2553 if (CtorArg.isInvalid()) 2554 return true; 2555 2556 BaseType = Array->getElementType(); 2557 } 2558 2559 // The array subscript expression is an lvalue, which is wrong for moving. 2560 if (Moving && InitializingArray) 2561 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2562 2563 // Construct the entity that we will be initializing. For an array, this 2564 // will be first element in the array, which may require several levels 2565 // of array-subscript entities. 2566 SmallVector<InitializedEntity, 4> Entities; 2567 Entities.reserve(1 + IndexVariables.size()); 2568 if (Indirect) 2569 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2570 else 2571 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2572 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2573 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2574 0, 2575 Entities.back())); 2576 2577 // Direct-initialize to use the copy constructor. 2578 InitializationKind InitKind = 2579 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2580 2581 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2582 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2583 &CtorArgE, 1); 2584 2585 ExprResult MemberInit 2586 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2587 MultiExprArg(&CtorArgE, 1)); 2588 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2589 if (MemberInit.isInvalid()) 2590 return true; 2591 2592 if (Indirect) { 2593 assert(IndexVariables.size() == 0 && 2594 "Indirect field improperly initialized"); 2595 CXXMemberInit 2596 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2597 Loc, Loc, 2598 MemberInit.takeAs<Expr>(), 2599 Loc); 2600 } else 2601 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2602 Loc, MemberInit.takeAs<Expr>(), 2603 Loc, 2604 IndexVariables.data(), 2605 IndexVariables.size()); 2606 return false; 2607 } 2608 2609 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2610 2611 QualType FieldBaseElementType = 2612 SemaRef.Context.getBaseElementType(Field->getType()); 2613 2614 if (FieldBaseElementType->isRecordType()) { 2615 InitializedEntity InitEntity 2616 = Indirect? InitializedEntity::InitializeMember(Indirect) 2617 : InitializedEntity::InitializeMember(Field); 2618 InitializationKind InitKind = 2619 InitializationKind::CreateDefault(Loc); 2620 2621 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2622 ExprResult MemberInit = 2623 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2624 2625 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2626 if (MemberInit.isInvalid()) 2627 return true; 2628 2629 if (Indirect) 2630 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2631 Indirect, Loc, 2632 Loc, 2633 MemberInit.get(), 2634 Loc); 2635 else 2636 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2637 Field, Loc, Loc, 2638 MemberInit.get(), 2639 Loc); 2640 return false; 2641 } 2642 2643 if (!Field->getParent()->isUnion()) { 2644 if (FieldBaseElementType->isReferenceType()) { 2645 SemaRef.Diag(Constructor->getLocation(), 2646 diag::err_uninitialized_member_in_ctor) 2647 << (int)Constructor->isImplicit() 2648 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2649 << 0 << Field->getDeclName(); 2650 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2651 return true; 2652 } 2653 2654 if (FieldBaseElementType.isConstQualified()) { 2655 SemaRef.Diag(Constructor->getLocation(), 2656 diag::err_uninitialized_member_in_ctor) 2657 << (int)Constructor->isImplicit() 2658 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2659 << 1 << Field->getDeclName(); 2660 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2661 return true; 2662 } 2663 } 2664 2665 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2666 FieldBaseElementType->isObjCRetainableType() && 2667 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2668 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2669 // Instant objects: 2670 // Default-initialize Objective-C pointers to NULL. 2671 CXXMemberInit 2672 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2673 Loc, Loc, 2674 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2675 Loc); 2676 return false; 2677 } 2678 2679 // Nothing to initialize. 2680 CXXMemberInit = 0; 2681 return false; 2682} 2683 2684namespace { 2685struct BaseAndFieldInfo { 2686 Sema &S; 2687 CXXConstructorDecl *Ctor; 2688 bool AnyErrorsInInits; 2689 ImplicitInitializerKind IIK; 2690 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2691 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2692 2693 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2694 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2695 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2696 if (Generated && Ctor->isCopyConstructor()) 2697 IIK = IIK_Copy; 2698 else if (Generated && Ctor->isMoveConstructor()) 2699 IIK = IIK_Move; 2700 else 2701 IIK = IIK_Default; 2702 } 2703 2704 bool isImplicitCopyOrMove() const { 2705 switch (IIK) { 2706 case IIK_Copy: 2707 case IIK_Move: 2708 return true; 2709 2710 case IIK_Default: 2711 return false; 2712 } 2713 2714 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2715 } 2716}; 2717} 2718 2719/// \brief Determine whether the given indirect field declaration is somewhere 2720/// within an anonymous union. 2721static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2722 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2723 CEnd = F->chain_end(); 2724 C != CEnd; ++C) 2725 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2726 if (Record->isUnion()) 2727 return true; 2728 2729 return false; 2730} 2731 2732/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2733/// array type. 2734static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2735 if (T->isIncompleteArrayType()) 2736 return true; 2737 2738 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2739 if (!ArrayT->getSize()) 2740 return true; 2741 2742 T = ArrayT->getElementType(); 2743 } 2744 2745 return false; 2746} 2747 2748static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2749 FieldDecl *Field, 2750 IndirectFieldDecl *Indirect = 0) { 2751 2752 // Overwhelmingly common case: we have a direct initializer for this field. 2753 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2754 Info.AllToInit.push_back(Init); 2755 return false; 2756 } 2757 2758 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2759 // has a brace-or-equal-initializer, the entity is initialized as specified 2760 // in [dcl.init]. 2761 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2762 CXXCtorInitializer *Init; 2763 if (Indirect) 2764 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2765 SourceLocation(), 2766 SourceLocation(), 0, 2767 SourceLocation()); 2768 else 2769 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2770 SourceLocation(), 2771 SourceLocation(), 0, 2772 SourceLocation()); 2773 Info.AllToInit.push_back(Init); 2774 return false; 2775 } 2776 2777 // Don't build an implicit initializer for union members if none was 2778 // explicitly specified. 2779 if (Field->getParent()->isUnion() || 2780 (Indirect && isWithinAnonymousUnion(Indirect))) 2781 return false; 2782 2783 // Don't initialize incomplete or zero-length arrays. 2784 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2785 return false; 2786 2787 // Don't try to build an implicit initializer if there were semantic 2788 // errors in any of the initializers (and therefore we might be 2789 // missing some that the user actually wrote). 2790 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2791 return false; 2792 2793 CXXCtorInitializer *Init = 0; 2794 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2795 Indirect, Init)) 2796 return true; 2797 2798 if (Init) 2799 Info.AllToInit.push_back(Init); 2800 2801 return false; 2802} 2803 2804bool 2805Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2806 CXXCtorInitializer *Initializer) { 2807 assert(Initializer->isDelegatingInitializer()); 2808 Constructor->setNumCtorInitializers(1); 2809 CXXCtorInitializer **initializer = 2810 new (Context) CXXCtorInitializer*[1]; 2811 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2812 Constructor->setCtorInitializers(initializer); 2813 2814 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2815 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2816 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2817 } 2818 2819 DelegatingCtorDecls.push_back(Constructor); 2820 2821 return false; 2822} 2823 2824bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2825 CXXCtorInitializer **Initializers, 2826 unsigned NumInitializers, 2827 bool AnyErrors) { 2828 if (Constructor->isDependentContext()) { 2829 // Just store the initializers as written, they will be checked during 2830 // instantiation. 2831 if (NumInitializers > 0) { 2832 Constructor->setNumCtorInitializers(NumInitializers); 2833 CXXCtorInitializer **baseOrMemberInitializers = 2834 new (Context) CXXCtorInitializer*[NumInitializers]; 2835 memcpy(baseOrMemberInitializers, Initializers, 2836 NumInitializers * sizeof(CXXCtorInitializer*)); 2837 Constructor->setCtorInitializers(baseOrMemberInitializers); 2838 } 2839 2840 return false; 2841 } 2842 2843 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2844 2845 // We need to build the initializer AST according to order of construction 2846 // and not what user specified in the Initializers list. 2847 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2848 if (!ClassDecl) 2849 return true; 2850 2851 bool HadError = false; 2852 2853 for (unsigned i = 0; i < NumInitializers; i++) { 2854 CXXCtorInitializer *Member = Initializers[i]; 2855 2856 if (Member->isBaseInitializer()) 2857 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2858 else 2859 Info.AllBaseFields[Member->getAnyMember()] = Member; 2860 } 2861 2862 // Keep track of the direct virtual bases. 2863 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2864 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2865 E = ClassDecl->bases_end(); I != E; ++I) { 2866 if (I->isVirtual()) 2867 DirectVBases.insert(I); 2868 } 2869 2870 // Push virtual bases before others. 2871 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2872 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2873 2874 if (CXXCtorInitializer *Value 2875 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2876 Info.AllToInit.push_back(Value); 2877 } else if (!AnyErrors) { 2878 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2879 CXXCtorInitializer *CXXBaseInit; 2880 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2881 VBase, IsInheritedVirtualBase, 2882 CXXBaseInit)) { 2883 HadError = true; 2884 continue; 2885 } 2886 2887 Info.AllToInit.push_back(CXXBaseInit); 2888 } 2889 } 2890 2891 // Non-virtual bases. 2892 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2893 E = ClassDecl->bases_end(); Base != E; ++Base) { 2894 // Virtuals are in the virtual base list and already constructed. 2895 if (Base->isVirtual()) 2896 continue; 2897 2898 if (CXXCtorInitializer *Value 2899 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2900 Info.AllToInit.push_back(Value); 2901 } else if (!AnyErrors) { 2902 CXXCtorInitializer *CXXBaseInit; 2903 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2904 Base, /*IsInheritedVirtualBase=*/false, 2905 CXXBaseInit)) { 2906 HadError = true; 2907 continue; 2908 } 2909 2910 Info.AllToInit.push_back(CXXBaseInit); 2911 } 2912 } 2913 2914 // Fields. 2915 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2916 MemEnd = ClassDecl->decls_end(); 2917 Mem != MemEnd; ++Mem) { 2918 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2919 // C++ [class.bit]p2: 2920 // A declaration for a bit-field that omits the identifier declares an 2921 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2922 // initialized. 2923 if (F->isUnnamedBitfield()) 2924 continue; 2925 2926 // If we're not generating the implicit copy/move constructor, then we'll 2927 // handle anonymous struct/union fields based on their individual 2928 // indirect fields. 2929 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2930 continue; 2931 2932 if (CollectFieldInitializer(*this, Info, F)) 2933 HadError = true; 2934 continue; 2935 } 2936 2937 // Beyond this point, we only consider default initialization. 2938 if (Info.IIK != IIK_Default) 2939 continue; 2940 2941 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2942 if (F->getType()->isIncompleteArrayType()) { 2943 assert(ClassDecl->hasFlexibleArrayMember() && 2944 "Incomplete array type is not valid"); 2945 continue; 2946 } 2947 2948 // Initialize each field of an anonymous struct individually. 2949 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2950 HadError = true; 2951 2952 continue; 2953 } 2954 } 2955 2956 NumInitializers = Info.AllToInit.size(); 2957 if (NumInitializers > 0) { 2958 Constructor->setNumCtorInitializers(NumInitializers); 2959 CXXCtorInitializer **baseOrMemberInitializers = 2960 new (Context) CXXCtorInitializer*[NumInitializers]; 2961 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2962 NumInitializers * sizeof(CXXCtorInitializer*)); 2963 Constructor->setCtorInitializers(baseOrMemberInitializers); 2964 2965 // Constructors implicitly reference the base and member 2966 // destructors. 2967 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2968 Constructor->getParent()); 2969 } 2970 2971 return HadError; 2972} 2973 2974static void *GetKeyForTopLevelField(FieldDecl *Field) { 2975 // For anonymous unions, use the class declaration as the key. 2976 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2977 if (RT->getDecl()->isAnonymousStructOrUnion()) 2978 return static_cast<void *>(RT->getDecl()); 2979 } 2980 return static_cast<void *>(Field); 2981} 2982 2983static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2984 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2985} 2986 2987static void *GetKeyForMember(ASTContext &Context, 2988 CXXCtorInitializer *Member) { 2989 if (!Member->isAnyMemberInitializer()) 2990 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2991 2992 // For fields injected into the class via declaration of an anonymous union, 2993 // use its anonymous union class declaration as the unique key. 2994 FieldDecl *Field = Member->getAnyMember(); 2995 2996 // If the field is a member of an anonymous struct or union, our key 2997 // is the anonymous record decl that's a direct child of the class. 2998 RecordDecl *RD = Field->getParent(); 2999 if (RD->isAnonymousStructOrUnion()) { 3000 while (true) { 3001 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3002 if (Parent->isAnonymousStructOrUnion()) 3003 RD = Parent; 3004 else 3005 break; 3006 } 3007 3008 return static_cast<void *>(RD); 3009 } 3010 3011 return static_cast<void *>(Field); 3012} 3013 3014static void 3015DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3016 const CXXConstructorDecl *Constructor, 3017 CXXCtorInitializer **Inits, 3018 unsigned NumInits) { 3019 if (Constructor->getDeclContext()->isDependentContext()) 3020 return; 3021 3022 // Don't check initializers order unless the warning is enabled at the 3023 // location of at least one initializer. 3024 bool ShouldCheckOrder = false; 3025 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3026 CXXCtorInitializer *Init = Inits[InitIndex]; 3027 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3028 Init->getSourceLocation()) 3029 != DiagnosticsEngine::Ignored) { 3030 ShouldCheckOrder = true; 3031 break; 3032 } 3033 } 3034 if (!ShouldCheckOrder) 3035 return; 3036 3037 // Build the list of bases and members in the order that they'll 3038 // actually be initialized. The explicit initializers should be in 3039 // this same order but may be missing things. 3040 SmallVector<const void*, 32> IdealInitKeys; 3041 3042 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3043 3044 // 1. Virtual bases. 3045 for (CXXRecordDecl::base_class_const_iterator VBase = 3046 ClassDecl->vbases_begin(), 3047 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3048 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3049 3050 // 2. Non-virtual bases. 3051 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3052 E = ClassDecl->bases_end(); Base != E; ++Base) { 3053 if (Base->isVirtual()) 3054 continue; 3055 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3056 } 3057 3058 // 3. Direct fields. 3059 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3060 E = ClassDecl->field_end(); Field != E; ++Field) { 3061 if (Field->isUnnamedBitfield()) 3062 continue; 3063 3064 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3065 } 3066 3067 unsigned NumIdealInits = IdealInitKeys.size(); 3068 unsigned IdealIndex = 0; 3069 3070 CXXCtorInitializer *PrevInit = 0; 3071 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3072 CXXCtorInitializer *Init = Inits[InitIndex]; 3073 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3074 3075 // Scan forward to try to find this initializer in the idealized 3076 // initializers list. 3077 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3078 if (InitKey == IdealInitKeys[IdealIndex]) 3079 break; 3080 3081 // If we didn't find this initializer, it must be because we 3082 // scanned past it on a previous iteration. That can only 3083 // happen if we're out of order; emit a warning. 3084 if (IdealIndex == NumIdealInits && PrevInit) { 3085 Sema::SemaDiagnosticBuilder D = 3086 SemaRef.Diag(PrevInit->getSourceLocation(), 3087 diag::warn_initializer_out_of_order); 3088 3089 if (PrevInit->isAnyMemberInitializer()) 3090 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3091 else 3092 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3093 3094 if (Init->isAnyMemberInitializer()) 3095 D << 0 << Init->getAnyMember()->getDeclName(); 3096 else 3097 D << 1 << Init->getTypeSourceInfo()->getType(); 3098 3099 // Move back to the initializer's location in the ideal list. 3100 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3101 if (InitKey == IdealInitKeys[IdealIndex]) 3102 break; 3103 3104 assert(IdealIndex != NumIdealInits && 3105 "initializer not found in initializer list"); 3106 } 3107 3108 PrevInit = Init; 3109 } 3110} 3111 3112namespace { 3113bool CheckRedundantInit(Sema &S, 3114 CXXCtorInitializer *Init, 3115 CXXCtorInitializer *&PrevInit) { 3116 if (!PrevInit) { 3117 PrevInit = Init; 3118 return false; 3119 } 3120 3121 if (FieldDecl *Field = Init->getMember()) 3122 S.Diag(Init->getSourceLocation(), 3123 diag::err_multiple_mem_initialization) 3124 << Field->getDeclName() 3125 << Init->getSourceRange(); 3126 else { 3127 const Type *BaseClass = Init->getBaseClass(); 3128 assert(BaseClass && "neither field nor base"); 3129 S.Diag(Init->getSourceLocation(), 3130 diag::err_multiple_base_initialization) 3131 << QualType(BaseClass, 0) 3132 << Init->getSourceRange(); 3133 } 3134 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3135 << 0 << PrevInit->getSourceRange(); 3136 3137 return true; 3138} 3139 3140typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3141typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3142 3143bool CheckRedundantUnionInit(Sema &S, 3144 CXXCtorInitializer *Init, 3145 RedundantUnionMap &Unions) { 3146 FieldDecl *Field = Init->getAnyMember(); 3147 RecordDecl *Parent = Field->getParent(); 3148 NamedDecl *Child = Field; 3149 3150 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3151 if (Parent->isUnion()) { 3152 UnionEntry &En = Unions[Parent]; 3153 if (En.first && En.first != Child) { 3154 S.Diag(Init->getSourceLocation(), 3155 diag::err_multiple_mem_union_initialization) 3156 << Field->getDeclName() 3157 << Init->getSourceRange(); 3158 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3159 << 0 << En.second->getSourceRange(); 3160 return true; 3161 } 3162 if (!En.first) { 3163 En.first = Child; 3164 En.second = Init; 3165 } 3166 if (!Parent->isAnonymousStructOrUnion()) 3167 return false; 3168 } 3169 3170 Child = Parent; 3171 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3172 } 3173 3174 return false; 3175} 3176} 3177 3178/// ActOnMemInitializers - Handle the member initializers for a constructor. 3179void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3180 SourceLocation ColonLoc, 3181 CXXCtorInitializer **meminits, 3182 unsigned NumMemInits, 3183 bool AnyErrors) { 3184 if (!ConstructorDecl) 3185 return; 3186 3187 AdjustDeclIfTemplate(ConstructorDecl); 3188 3189 CXXConstructorDecl *Constructor 3190 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3191 3192 if (!Constructor) { 3193 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3194 return; 3195 } 3196 3197 CXXCtorInitializer **MemInits = 3198 reinterpret_cast<CXXCtorInitializer **>(meminits); 3199 3200 // Mapping for the duplicate initializers check. 3201 // For member initializers, this is keyed with a FieldDecl*. 3202 // For base initializers, this is keyed with a Type*. 3203 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3204 3205 // Mapping for the inconsistent anonymous-union initializers check. 3206 RedundantUnionMap MemberUnions; 3207 3208 bool HadError = false; 3209 for (unsigned i = 0; i < NumMemInits; i++) { 3210 CXXCtorInitializer *Init = MemInits[i]; 3211 3212 // Set the source order index. 3213 Init->setSourceOrder(i); 3214 3215 if (Init->isAnyMemberInitializer()) { 3216 FieldDecl *Field = Init->getAnyMember(); 3217 if (CheckRedundantInit(*this, Init, Members[Field]) || 3218 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3219 HadError = true; 3220 } else if (Init->isBaseInitializer()) { 3221 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3222 if (CheckRedundantInit(*this, Init, Members[Key])) 3223 HadError = true; 3224 } else { 3225 assert(Init->isDelegatingInitializer()); 3226 // This must be the only initializer 3227 if (i != 0 || NumMemInits > 1) { 3228 Diag(MemInits[0]->getSourceLocation(), 3229 diag::err_delegating_initializer_alone) 3230 << MemInits[0]->getSourceRange(); 3231 HadError = true; 3232 // We will treat this as being the only initializer. 3233 } 3234 SetDelegatingInitializer(Constructor, MemInits[i]); 3235 // Return immediately as the initializer is set. 3236 return; 3237 } 3238 } 3239 3240 if (HadError) 3241 return; 3242 3243 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3244 3245 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3246} 3247 3248void 3249Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3250 CXXRecordDecl *ClassDecl) { 3251 // Ignore dependent contexts. Also ignore unions, since their members never 3252 // have destructors implicitly called. 3253 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3254 return; 3255 3256 // FIXME: all the access-control diagnostics are positioned on the 3257 // field/base declaration. That's probably good; that said, the 3258 // user might reasonably want to know why the destructor is being 3259 // emitted, and we currently don't say. 3260 3261 // Non-static data members. 3262 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3263 E = ClassDecl->field_end(); I != E; ++I) { 3264 FieldDecl *Field = *I; 3265 if (Field->isInvalidDecl()) 3266 continue; 3267 3268 // Don't destroy incomplete or zero-length arrays. 3269 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3270 continue; 3271 3272 QualType FieldType = Context.getBaseElementType(Field->getType()); 3273 3274 const RecordType* RT = FieldType->getAs<RecordType>(); 3275 if (!RT) 3276 continue; 3277 3278 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3279 if (FieldClassDecl->isInvalidDecl()) 3280 continue; 3281 if (FieldClassDecl->hasTrivialDestructor()) 3282 continue; 3283 3284 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3285 assert(Dtor && "No dtor found for FieldClassDecl!"); 3286 CheckDestructorAccess(Field->getLocation(), Dtor, 3287 PDiag(diag::err_access_dtor_field) 3288 << Field->getDeclName() 3289 << FieldType); 3290 3291 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3292 } 3293 3294 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3295 3296 // Bases. 3297 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3298 E = ClassDecl->bases_end(); Base != E; ++Base) { 3299 // Bases are always records in a well-formed non-dependent class. 3300 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3301 3302 // Remember direct virtual bases. 3303 if (Base->isVirtual()) 3304 DirectVirtualBases.insert(RT); 3305 3306 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3307 // If our base class is invalid, we probably can't get its dtor anyway. 3308 if (BaseClassDecl->isInvalidDecl()) 3309 continue; 3310 // Ignore trivial destructors. 3311 if (BaseClassDecl->hasTrivialDestructor()) 3312 continue; 3313 3314 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3315 assert(Dtor && "No dtor found for BaseClassDecl!"); 3316 3317 // FIXME: caret should be on the start of the class name 3318 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3319 PDiag(diag::err_access_dtor_base) 3320 << Base->getType() 3321 << Base->getSourceRange()); 3322 3323 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3324 } 3325 3326 // Virtual bases. 3327 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3328 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3329 3330 // Bases are always records in a well-formed non-dependent class. 3331 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3332 3333 // Ignore direct virtual bases. 3334 if (DirectVirtualBases.count(RT)) 3335 continue; 3336 3337 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3338 // If our base class is invalid, we probably can't get its dtor anyway. 3339 if (BaseClassDecl->isInvalidDecl()) 3340 continue; 3341 // Ignore trivial destructors. 3342 if (BaseClassDecl->hasTrivialDestructor()) 3343 continue; 3344 3345 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3346 assert(Dtor && "No dtor found for BaseClassDecl!"); 3347 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3348 PDiag(diag::err_access_dtor_vbase) 3349 << VBase->getType()); 3350 3351 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3352 } 3353} 3354 3355void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3356 if (!CDtorDecl) 3357 return; 3358 3359 if (CXXConstructorDecl *Constructor 3360 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3361 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3362} 3363 3364bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3365 unsigned DiagID, AbstractDiagSelID SelID) { 3366 if (SelID == -1) 3367 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3368 else 3369 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3370} 3371 3372bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3373 const PartialDiagnostic &PD) { 3374 if (!getLangOptions().CPlusPlus) 3375 return false; 3376 3377 if (const ArrayType *AT = Context.getAsArrayType(T)) 3378 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3379 3380 if (const PointerType *PT = T->getAs<PointerType>()) { 3381 // Find the innermost pointer type. 3382 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3383 PT = T; 3384 3385 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3386 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3387 } 3388 3389 const RecordType *RT = T->getAs<RecordType>(); 3390 if (!RT) 3391 return false; 3392 3393 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3394 3395 // We can't answer whether something is abstract until it has a 3396 // definition. If it's currently being defined, we'll walk back 3397 // over all the declarations when we have a full definition. 3398 const CXXRecordDecl *Def = RD->getDefinition(); 3399 if (!Def || Def->isBeingDefined()) 3400 return false; 3401 3402 if (!RD->isAbstract()) 3403 return false; 3404 3405 Diag(Loc, PD) << RD->getDeclName(); 3406 DiagnoseAbstractType(RD); 3407 3408 return true; 3409} 3410 3411void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3412 // Check if we've already emitted the list of pure virtual functions 3413 // for this class. 3414 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3415 return; 3416 3417 CXXFinalOverriderMap FinalOverriders; 3418 RD->getFinalOverriders(FinalOverriders); 3419 3420 // Keep a set of seen pure methods so we won't diagnose the same method 3421 // more than once. 3422 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3423 3424 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3425 MEnd = FinalOverriders.end(); 3426 M != MEnd; 3427 ++M) { 3428 for (OverridingMethods::iterator SO = M->second.begin(), 3429 SOEnd = M->second.end(); 3430 SO != SOEnd; ++SO) { 3431 // C++ [class.abstract]p4: 3432 // A class is abstract if it contains or inherits at least one 3433 // pure virtual function for which the final overrider is pure 3434 // virtual. 3435 3436 // 3437 if (SO->second.size() != 1) 3438 continue; 3439 3440 if (!SO->second.front().Method->isPure()) 3441 continue; 3442 3443 if (!SeenPureMethods.insert(SO->second.front().Method)) 3444 continue; 3445 3446 Diag(SO->second.front().Method->getLocation(), 3447 diag::note_pure_virtual_function) 3448 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3449 } 3450 } 3451 3452 if (!PureVirtualClassDiagSet) 3453 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3454 PureVirtualClassDiagSet->insert(RD); 3455} 3456 3457namespace { 3458struct AbstractUsageInfo { 3459 Sema &S; 3460 CXXRecordDecl *Record; 3461 CanQualType AbstractType; 3462 bool Invalid; 3463 3464 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3465 : S(S), Record(Record), 3466 AbstractType(S.Context.getCanonicalType( 3467 S.Context.getTypeDeclType(Record))), 3468 Invalid(false) {} 3469 3470 void DiagnoseAbstractType() { 3471 if (Invalid) return; 3472 S.DiagnoseAbstractType(Record); 3473 Invalid = true; 3474 } 3475 3476 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3477}; 3478 3479struct CheckAbstractUsage { 3480 AbstractUsageInfo &Info; 3481 const NamedDecl *Ctx; 3482 3483 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3484 : Info(Info), Ctx(Ctx) {} 3485 3486 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3487 switch (TL.getTypeLocClass()) { 3488#define ABSTRACT_TYPELOC(CLASS, PARENT) 3489#define TYPELOC(CLASS, PARENT) \ 3490 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3491#include "clang/AST/TypeLocNodes.def" 3492 } 3493 } 3494 3495 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3496 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3497 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3498 if (!TL.getArg(I)) 3499 continue; 3500 3501 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3502 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3503 } 3504 } 3505 3506 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3507 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3508 } 3509 3510 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3511 // Visit the type parameters from a permissive context. 3512 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3513 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3514 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3515 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3516 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3517 // TODO: other template argument types? 3518 } 3519 } 3520 3521 // Visit pointee types from a permissive context. 3522#define CheckPolymorphic(Type) \ 3523 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3524 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3525 } 3526 CheckPolymorphic(PointerTypeLoc) 3527 CheckPolymorphic(ReferenceTypeLoc) 3528 CheckPolymorphic(MemberPointerTypeLoc) 3529 CheckPolymorphic(BlockPointerTypeLoc) 3530 CheckPolymorphic(AtomicTypeLoc) 3531 3532 /// Handle all the types we haven't given a more specific 3533 /// implementation for above. 3534 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3535 // Every other kind of type that we haven't called out already 3536 // that has an inner type is either (1) sugar or (2) contains that 3537 // inner type in some way as a subobject. 3538 if (TypeLoc Next = TL.getNextTypeLoc()) 3539 return Visit(Next, Sel); 3540 3541 // If there's no inner type and we're in a permissive context, 3542 // don't diagnose. 3543 if (Sel == Sema::AbstractNone) return; 3544 3545 // Check whether the type matches the abstract type. 3546 QualType T = TL.getType(); 3547 if (T->isArrayType()) { 3548 Sel = Sema::AbstractArrayType; 3549 T = Info.S.Context.getBaseElementType(T); 3550 } 3551 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3552 if (CT != Info.AbstractType) return; 3553 3554 // It matched; do some magic. 3555 if (Sel == Sema::AbstractArrayType) { 3556 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3557 << T << TL.getSourceRange(); 3558 } else { 3559 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3560 << Sel << T << TL.getSourceRange(); 3561 } 3562 Info.DiagnoseAbstractType(); 3563 } 3564}; 3565 3566void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3567 Sema::AbstractDiagSelID Sel) { 3568 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3569} 3570 3571} 3572 3573/// Check for invalid uses of an abstract type in a method declaration. 3574static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3575 CXXMethodDecl *MD) { 3576 // No need to do the check on definitions, which require that 3577 // the return/param types be complete. 3578 if (MD->doesThisDeclarationHaveABody()) 3579 return; 3580 3581 // For safety's sake, just ignore it if we don't have type source 3582 // information. This should never happen for non-implicit methods, 3583 // but... 3584 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3585 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3586} 3587 3588/// Check for invalid uses of an abstract type within a class definition. 3589static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3590 CXXRecordDecl *RD) { 3591 for (CXXRecordDecl::decl_iterator 3592 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3593 Decl *D = *I; 3594 if (D->isImplicit()) continue; 3595 3596 // Methods and method templates. 3597 if (isa<CXXMethodDecl>(D)) { 3598 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3599 } else if (isa<FunctionTemplateDecl>(D)) { 3600 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3601 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3602 3603 // Fields and static variables. 3604 } else if (isa<FieldDecl>(D)) { 3605 FieldDecl *FD = cast<FieldDecl>(D); 3606 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3607 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3608 } else if (isa<VarDecl>(D)) { 3609 VarDecl *VD = cast<VarDecl>(D); 3610 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3611 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3612 3613 // Nested classes and class templates. 3614 } else if (isa<CXXRecordDecl>(D)) { 3615 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3616 } else if (isa<ClassTemplateDecl>(D)) { 3617 CheckAbstractClassUsage(Info, 3618 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3619 } 3620 } 3621} 3622 3623/// \brief Perform semantic checks on a class definition that has been 3624/// completing, introducing implicitly-declared members, checking for 3625/// abstract types, etc. 3626void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3627 if (!Record) 3628 return; 3629 3630 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3631 AbstractUsageInfo Info(*this, Record); 3632 CheckAbstractClassUsage(Info, Record); 3633 } 3634 3635 // If this is not an aggregate type and has no user-declared constructor, 3636 // complain about any non-static data members of reference or const scalar 3637 // type, since they will never get initializers. 3638 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3639 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3640 bool Complained = false; 3641 for (RecordDecl::field_iterator F = Record->field_begin(), 3642 FEnd = Record->field_end(); 3643 F != FEnd; ++F) { 3644 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3645 continue; 3646 3647 if (F->getType()->isReferenceType() || 3648 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3649 if (!Complained) { 3650 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3651 << Record->getTagKind() << Record; 3652 Complained = true; 3653 } 3654 3655 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3656 << F->getType()->isReferenceType() 3657 << F->getDeclName(); 3658 } 3659 } 3660 } 3661 3662 if (Record->isDynamicClass() && !Record->isDependentType()) 3663 DynamicClasses.push_back(Record); 3664 3665 if (Record->getIdentifier()) { 3666 // C++ [class.mem]p13: 3667 // If T is the name of a class, then each of the following shall have a 3668 // name different from T: 3669 // - every member of every anonymous union that is a member of class T. 3670 // 3671 // C++ [class.mem]p14: 3672 // In addition, if class T has a user-declared constructor (12.1), every 3673 // non-static data member of class T shall have a name different from T. 3674 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3675 R.first != R.second; ++R.first) { 3676 NamedDecl *D = *R.first; 3677 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3678 isa<IndirectFieldDecl>(D)) { 3679 Diag(D->getLocation(), diag::err_member_name_of_class) 3680 << D->getDeclName(); 3681 break; 3682 } 3683 } 3684 } 3685 3686 // Warn if the class has virtual methods but non-virtual public destructor. 3687 if (Record->isPolymorphic() && !Record->isDependentType()) { 3688 CXXDestructorDecl *dtor = Record->getDestructor(); 3689 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3690 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3691 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3692 } 3693 3694 // See if a method overloads virtual methods in a base 3695 /// class without overriding any. 3696 if (!Record->isDependentType()) { 3697 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3698 MEnd = Record->method_end(); 3699 M != MEnd; ++M) { 3700 if (!(*M)->isStatic()) 3701 DiagnoseHiddenVirtualMethods(Record, *M); 3702 } 3703 } 3704 3705 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3706 // function that is not a constructor declares that member function to be 3707 // const. [...] The class of which that function is a member shall be 3708 // a literal type. 3709 // 3710 // It's fine to diagnose constructors here too: such constructors cannot 3711 // produce a constant expression, so are ill-formed (no diagnostic required). 3712 // 3713 // If the class has virtual bases, any constexpr members will already have 3714 // been diagnosed by the checks performed on the member declaration, so 3715 // suppress this (less useful) diagnostic. 3716 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3717 !Record->isLiteral() && !Record->getNumVBases()) { 3718 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3719 MEnd = Record->method_end(); 3720 M != MEnd; ++M) { 3721 if (M->isConstexpr() && M->isInstance()) { 3722 switch (Record->getTemplateSpecializationKind()) { 3723 case TSK_ImplicitInstantiation: 3724 case TSK_ExplicitInstantiationDeclaration: 3725 case TSK_ExplicitInstantiationDefinition: 3726 // If a template instantiates to a non-literal type, but its members 3727 // instantiate to constexpr functions, the template is technically 3728 // ill-formed, but we allow it for sanity. Such members are treated as 3729 // non-constexpr. 3730 (*M)->setConstexpr(false); 3731 continue; 3732 3733 case TSK_Undeclared: 3734 case TSK_ExplicitSpecialization: 3735 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3736 PDiag(diag::err_constexpr_method_non_literal)); 3737 break; 3738 } 3739 3740 // Only produce one error per class. 3741 break; 3742 } 3743 } 3744 } 3745 3746 // Declare inherited constructors. We do this eagerly here because: 3747 // - The standard requires an eager diagnostic for conflicting inherited 3748 // constructors from different classes. 3749 // - The lazy declaration of the other implicit constructors is so as to not 3750 // waste space and performance on classes that are not meant to be 3751 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3752 // have inherited constructors. 3753 DeclareInheritedConstructors(Record); 3754 3755 if (!Record->isDependentType()) 3756 CheckExplicitlyDefaultedMethods(Record); 3757} 3758 3759void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3760 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3761 ME = Record->method_end(); 3762 MI != ME; ++MI) { 3763 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3764 switch (getSpecialMember(*MI)) { 3765 case CXXDefaultConstructor: 3766 CheckExplicitlyDefaultedDefaultConstructor( 3767 cast<CXXConstructorDecl>(*MI)); 3768 break; 3769 3770 case CXXDestructor: 3771 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3772 break; 3773 3774 case CXXCopyConstructor: 3775 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3776 break; 3777 3778 case CXXCopyAssignment: 3779 CheckExplicitlyDefaultedCopyAssignment(*MI); 3780 break; 3781 3782 case CXXMoveConstructor: 3783 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3784 break; 3785 3786 case CXXMoveAssignment: 3787 CheckExplicitlyDefaultedMoveAssignment(*MI); 3788 break; 3789 3790 case CXXInvalid: 3791 llvm_unreachable("non-special member explicitly defaulted!"); 3792 } 3793 } 3794 } 3795 3796} 3797 3798void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3799 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3800 3801 // Whether this was the first-declared instance of the constructor. 3802 // This affects whether we implicitly add an exception spec (and, eventually, 3803 // constexpr). It is also ill-formed to explicitly default a constructor such 3804 // that it would be deleted. (C++0x [decl.fct.def.default]) 3805 bool First = CD == CD->getCanonicalDecl(); 3806 3807 bool HadError = false; 3808 if (CD->getNumParams() != 0) { 3809 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3810 << CD->getSourceRange(); 3811 HadError = true; 3812 } 3813 3814 ImplicitExceptionSpecification Spec 3815 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3816 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3817 if (EPI.ExceptionSpecType == EST_Delayed) { 3818 // Exception specification depends on some deferred part of the class. We'll 3819 // try again when the class's definition has been fully processed. 3820 return; 3821 } 3822 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3823 *ExceptionType = Context.getFunctionType( 3824 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3825 3826 // C++11 [dcl.fct.def.default]p2: 3827 // An explicitly-defaulted function may be declared constexpr only if it 3828 // would have been implicitly declared as constexpr, 3829 if (CD->isConstexpr()) { 3830 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3831 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3832 << CXXDefaultConstructor; 3833 HadError = true; 3834 } 3835 } 3836 // and may have an explicit exception-specification only if it is compatible 3837 // with the exception-specification on the implicit declaration. 3838 if (CtorType->hasExceptionSpec()) { 3839 if (CheckEquivalentExceptionSpec( 3840 PDiag(diag::err_incorrect_defaulted_exception_spec) 3841 << CXXDefaultConstructor, 3842 PDiag(), 3843 ExceptionType, SourceLocation(), 3844 CtorType, CD->getLocation())) { 3845 HadError = true; 3846 } 3847 } 3848 3849 // If a function is explicitly defaulted on its first declaration, 3850 if (First) { 3851 // -- it is implicitly considered to be constexpr if the implicit 3852 // definition would be, 3853 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3854 3855 // -- it is implicitly considered to have the same 3856 // exception-specification as if it had been implicitly declared 3857 // 3858 // FIXME: a compatible, but different, explicit exception specification 3859 // will be silently overridden. We should issue a warning if this happens. 3860 EPI.ExtInfo = CtorType->getExtInfo(); 3861 } 3862 3863 if (HadError) { 3864 CD->setInvalidDecl(); 3865 return; 3866 } 3867 3868 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3869 if (First) { 3870 CD->setDeletedAsWritten(); 3871 } else { 3872 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3873 << CXXDefaultConstructor; 3874 CD->setInvalidDecl(); 3875 } 3876 } 3877} 3878 3879void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3880 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3881 3882 // Whether this was the first-declared instance of the constructor. 3883 bool First = CD == CD->getCanonicalDecl(); 3884 3885 bool HadError = false; 3886 if (CD->getNumParams() != 1) { 3887 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3888 << CD->getSourceRange(); 3889 HadError = true; 3890 } 3891 3892 ImplicitExceptionSpecification Spec(Context); 3893 bool Const; 3894 llvm::tie(Spec, Const) = 3895 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3896 3897 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3898 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3899 *ExceptionType = Context.getFunctionType( 3900 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3901 3902 // Check for parameter type matching. 3903 // This is a copy ctor so we know it's a cv-qualified reference to T. 3904 QualType ArgType = CtorType->getArgType(0); 3905 if (ArgType->getPointeeType().isVolatileQualified()) { 3906 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3907 HadError = true; 3908 } 3909 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3910 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3911 HadError = true; 3912 } 3913 3914 // C++11 [dcl.fct.def.default]p2: 3915 // An explicitly-defaulted function may be declared constexpr only if it 3916 // would have been implicitly declared as constexpr, 3917 if (CD->isConstexpr()) { 3918 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3919 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3920 << CXXCopyConstructor; 3921 HadError = true; 3922 } 3923 } 3924 // and may have an explicit exception-specification only if it is compatible 3925 // with the exception-specification on the implicit declaration. 3926 if (CtorType->hasExceptionSpec()) { 3927 if (CheckEquivalentExceptionSpec( 3928 PDiag(diag::err_incorrect_defaulted_exception_spec) 3929 << CXXCopyConstructor, 3930 PDiag(), 3931 ExceptionType, SourceLocation(), 3932 CtorType, CD->getLocation())) { 3933 HadError = true; 3934 } 3935 } 3936 3937 // If a function is explicitly defaulted on its first declaration, 3938 if (First) { 3939 // -- it is implicitly considered to be constexpr if the implicit 3940 // definition would be, 3941 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3942 3943 // -- it is implicitly considered to have the same 3944 // exception-specification as if it had been implicitly declared, and 3945 // 3946 // FIXME: a compatible, but different, explicit exception specification 3947 // will be silently overridden. We should issue a warning if this happens. 3948 EPI.ExtInfo = CtorType->getExtInfo(); 3949 3950 // -- [...] it shall have the same parameter type as if it had been 3951 // implicitly declared. 3952 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3953 } 3954 3955 if (HadError) { 3956 CD->setInvalidDecl(); 3957 return; 3958 } 3959 3960 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3961 if (First) { 3962 CD->setDeletedAsWritten(); 3963 } else { 3964 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3965 << CXXCopyConstructor; 3966 CD->setInvalidDecl(); 3967 } 3968 } 3969} 3970 3971void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3972 assert(MD->isExplicitlyDefaulted()); 3973 3974 // Whether this was the first-declared instance of the operator 3975 bool First = MD == MD->getCanonicalDecl(); 3976 3977 bool HadError = false; 3978 if (MD->getNumParams() != 1) { 3979 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3980 << MD->getSourceRange(); 3981 HadError = true; 3982 } 3983 3984 QualType ReturnType = 3985 MD->getType()->getAs<FunctionType>()->getResultType(); 3986 if (!ReturnType->isLValueReferenceType() || 3987 !Context.hasSameType( 3988 Context.getCanonicalType(ReturnType->getPointeeType()), 3989 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3990 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3991 HadError = true; 3992 } 3993 3994 ImplicitExceptionSpecification Spec(Context); 3995 bool Const; 3996 llvm::tie(Spec, Const) = 3997 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3998 3999 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4000 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4001 *ExceptionType = Context.getFunctionType( 4002 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4003 4004 QualType ArgType = OperType->getArgType(0); 4005 if (!ArgType->isLValueReferenceType()) { 4006 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4007 HadError = true; 4008 } else { 4009 if (ArgType->getPointeeType().isVolatileQualified()) { 4010 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4011 HadError = true; 4012 } 4013 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4014 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4015 HadError = true; 4016 } 4017 } 4018 4019 if (OperType->getTypeQuals()) { 4020 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4021 HadError = true; 4022 } 4023 4024 if (OperType->hasExceptionSpec()) { 4025 if (CheckEquivalentExceptionSpec( 4026 PDiag(diag::err_incorrect_defaulted_exception_spec) 4027 << CXXCopyAssignment, 4028 PDiag(), 4029 ExceptionType, SourceLocation(), 4030 OperType, MD->getLocation())) { 4031 HadError = true; 4032 } 4033 } 4034 if (First) { 4035 // We set the declaration to have the computed exception spec here. 4036 // We duplicate the one parameter type. 4037 EPI.RefQualifier = OperType->getRefQualifier(); 4038 EPI.ExtInfo = OperType->getExtInfo(); 4039 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4040 } 4041 4042 if (HadError) { 4043 MD->setInvalidDecl(); 4044 return; 4045 } 4046 4047 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4048 if (First) { 4049 MD->setDeletedAsWritten(); 4050 } else { 4051 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4052 << CXXCopyAssignment; 4053 MD->setInvalidDecl(); 4054 } 4055 } 4056} 4057 4058void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4059 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4060 4061 // Whether this was the first-declared instance of the constructor. 4062 bool First = CD == CD->getCanonicalDecl(); 4063 4064 bool HadError = false; 4065 if (CD->getNumParams() != 1) { 4066 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4067 << CD->getSourceRange(); 4068 HadError = true; 4069 } 4070 4071 ImplicitExceptionSpecification Spec( 4072 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4073 4074 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4075 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4076 *ExceptionType = Context.getFunctionType( 4077 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4078 4079 // Check for parameter type matching. 4080 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4081 QualType ArgType = CtorType->getArgType(0); 4082 if (ArgType->getPointeeType().isVolatileQualified()) { 4083 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4084 HadError = true; 4085 } 4086 if (ArgType->getPointeeType().isConstQualified()) { 4087 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4088 HadError = true; 4089 } 4090 4091 // C++11 [dcl.fct.def.default]p2: 4092 // An explicitly-defaulted function may be declared constexpr only if it 4093 // would have been implicitly declared as constexpr, 4094 if (CD->isConstexpr()) { 4095 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4096 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4097 << CXXMoveConstructor; 4098 HadError = true; 4099 } 4100 } 4101 // and may have an explicit exception-specification only if it is compatible 4102 // with the exception-specification on the implicit declaration. 4103 if (CtorType->hasExceptionSpec()) { 4104 if (CheckEquivalentExceptionSpec( 4105 PDiag(diag::err_incorrect_defaulted_exception_spec) 4106 << CXXMoveConstructor, 4107 PDiag(), 4108 ExceptionType, SourceLocation(), 4109 CtorType, CD->getLocation())) { 4110 HadError = true; 4111 } 4112 } 4113 4114 // If a function is explicitly defaulted on its first declaration, 4115 if (First) { 4116 // -- it is implicitly considered to be constexpr if the implicit 4117 // definition would be, 4118 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4119 4120 // -- it is implicitly considered to have the same 4121 // exception-specification as if it had been implicitly declared, and 4122 // 4123 // FIXME: a compatible, but different, explicit exception specification 4124 // will be silently overridden. We should issue a warning if this happens. 4125 EPI.ExtInfo = CtorType->getExtInfo(); 4126 4127 // -- [...] it shall have the same parameter type as if it had been 4128 // implicitly declared. 4129 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4130 } 4131 4132 if (HadError) { 4133 CD->setInvalidDecl(); 4134 return; 4135 } 4136 4137 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4138 if (First) { 4139 CD->setDeletedAsWritten(); 4140 } else { 4141 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4142 << CXXMoveConstructor; 4143 CD->setInvalidDecl(); 4144 } 4145 } 4146} 4147 4148void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4149 assert(MD->isExplicitlyDefaulted()); 4150 4151 // Whether this was the first-declared instance of the operator 4152 bool First = MD == MD->getCanonicalDecl(); 4153 4154 bool HadError = false; 4155 if (MD->getNumParams() != 1) { 4156 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4157 << MD->getSourceRange(); 4158 HadError = true; 4159 } 4160 4161 QualType ReturnType = 4162 MD->getType()->getAs<FunctionType>()->getResultType(); 4163 if (!ReturnType->isLValueReferenceType() || 4164 !Context.hasSameType( 4165 Context.getCanonicalType(ReturnType->getPointeeType()), 4166 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4167 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4168 HadError = true; 4169 } 4170 4171 ImplicitExceptionSpecification Spec( 4172 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4173 4174 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4175 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4176 *ExceptionType = Context.getFunctionType( 4177 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4178 4179 QualType ArgType = OperType->getArgType(0); 4180 if (!ArgType->isRValueReferenceType()) { 4181 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4182 HadError = true; 4183 } else { 4184 if (ArgType->getPointeeType().isVolatileQualified()) { 4185 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4186 HadError = true; 4187 } 4188 if (ArgType->getPointeeType().isConstQualified()) { 4189 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4190 HadError = true; 4191 } 4192 } 4193 4194 if (OperType->getTypeQuals()) { 4195 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4196 HadError = true; 4197 } 4198 4199 if (OperType->hasExceptionSpec()) { 4200 if (CheckEquivalentExceptionSpec( 4201 PDiag(diag::err_incorrect_defaulted_exception_spec) 4202 << CXXMoveAssignment, 4203 PDiag(), 4204 ExceptionType, SourceLocation(), 4205 OperType, MD->getLocation())) { 4206 HadError = true; 4207 } 4208 } 4209 if (First) { 4210 // We set the declaration to have the computed exception spec here. 4211 // We duplicate the one parameter type. 4212 EPI.RefQualifier = OperType->getRefQualifier(); 4213 EPI.ExtInfo = OperType->getExtInfo(); 4214 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4215 } 4216 4217 if (HadError) { 4218 MD->setInvalidDecl(); 4219 return; 4220 } 4221 4222 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4223 if (First) { 4224 MD->setDeletedAsWritten(); 4225 } else { 4226 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4227 << CXXMoveAssignment; 4228 MD->setInvalidDecl(); 4229 } 4230 } 4231} 4232 4233void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4234 assert(DD->isExplicitlyDefaulted()); 4235 4236 // Whether this was the first-declared instance of the destructor. 4237 bool First = DD == DD->getCanonicalDecl(); 4238 4239 ImplicitExceptionSpecification Spec 4240 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4241 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4242 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4243 *ExceptionType = Context.getFunctionType( 4244 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4245 4246 if (DtorType->hasExceptionSpec()) { 4247 if (CheckEquivalentExceptionSpec( 4248 PDiag(diag::err_incorrect_defaulted_exception_spec) 4249 << CXXDestructor, 4250 PDiag(), 4251 ExceptionType, SourceLocation(), 4252 DtorType, DD->getLocation())) { 4253 DD->setInvalidDecl(); 4254 return; 4255 } 4256 } 4257 if (First) { 4258 // We set the declaration to have the computed exception spec here. 4259 // There are no parameters. 4260 EPI.ExtInfo = DtorType->getExtInfo(); 4261 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4262 } 4263 4264 if (ShouldDeleteDestructor(DD)) { 4265 if (First) { 4266 DD->setDeletedAsWritten(); 4267 } else { 4268 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4269 << CXXDestructor; 4270 DD->setInvalidDecl(); 4271 } 4272 } 4273} 4274 4275/// This function implements the following C++0x paragraphs: 4276/// - [class.ctor]/5 4277/// - [class.copy]/11 4278bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4279 assert(!MD->isInvalidDecl()); 4280 CXXRecordDecl *RD = MD->getParent(); 4281 assert(!RD->isDependentType() && "do deletion after instantiation"); 4282 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4283 return false; 4284 4285 bool IsUnion = RD->isUnion(); 4286 bool IsConstructor = false; 4287 bool IsAssignment = false; 4288 bool IsMove = false; 4289 4290 bool ConstArg = false; 4291 4292 switch (CSM) { 4293 case CXXDefaultConstructor: 4294 IsConstructor = true; 4295 break; 4296 case CXXCopyConstructor: 4297 IsConstructor = true; 4298 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4299 break; 4300 case CXXMoveConstructor: 4301 IsConstructor = true; 4302 IsMove = true; 4303 break; 4304 default: 4305 llvm_unreachable("function only currently implemented for default ctors"); 4306 } 4307 4308 SourceLocation Loc = MD->getLocation(); 4309 4310 // Do access control from the special member function 4311 ContextRAII MethodContext(*this, MD); 4312 4313 bool AllConst = true; 4314 4315 // We do this because we should never actually use an anonymous 4316 // union's constructor. 4317 if (IsUnion && RD->isAnonymousStructOrUnion()) 4318 return false; 4319 4320 // FIXME: We should put some diagnostic logic right into this function. 4321 4322 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4323 BE = RD->bases_end(); 4324 BI != BE; ++BI) { 4325 // We'll handle this one later 4326 if (BI->isVirtual()) 4327 continue; 4328 4329 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4330 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4331 4332 // Unless we have an assignment operator, the base's destructor must 4333 // be accessible and not deleted. 4334 if (!IsAssignment) { 4335 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4336 if (BaseDtor->isDeleted()) 4337 return true; 4338 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4339 AR_accessible) 4340 return true; 4341 } 4342 4343 // Finding the corresponding member in the base should lead to a 4344 // unique, accessible, non-deleted function. If we are doing 4345 // a destructor, we have already checked this case. 4346 if (CSM != CXXDestructor) { 4347 SpecialMemberOverloadResult *SMOR = 4348 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4349 false); 4350 if (!SMOR->hasSuccess()) 4351 return true; 4352 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4353 if (IsConstructor) { 4354 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4355 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4356 PDiag()) != AR_accessible) 4357 return true; 4358 4359 // For a move operation, the corresponding operation must actually 4360 // be a move operation (and not a copy selected by overload 4361 // resolution) unless we are working on a trivially copyable class. 4362 if (IsMove && !BaseCtor->isMoveConstructor() && 4363 !BaseDecl->isTriviallyCopyable()) 4364 return true; 4365 } 4366 } 4367 } 4368 4369 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4370 BE = RD->vbases_end(); 4371 BI != BE; ++BI) { 4372 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4373 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4374 4375 // Unless we have an assignment operator, the base's destructor must 4376 // be accessible and not deleted. 4377 if (!IsAssignment) { 4378 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4379 if (BaseDtor->isDeleted()) 4380 return true; 4381 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4382 AR_accessible) 4383 return true; 4384 } 4385 4386 // Finding the corresponding member in the base should lead to a 4387 // unique, accessible, non-deleted function. 4388 if (CSM != CXXDestructor) { 4389 SpecialMemberOverloadResult *SMOR = 4390 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4391 false); 4392 if (!SMOR->hasSuccess()) 4393 return true; 4394 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4395 if (IsConstructor) { 4396 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4397 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4398 PDiag()) != AR_accessible) 4399 return true; 4400 4401 // For a move operation, the corresponding operation must actually 4402 // be a move operation (and not a copy selected by overload 4403 // resolution) unless we are working on a trivially copyable class. 4404 if (IsMove && !BaseCtor->isMoveConstructor() && 4405 !BaseDecl->isTriviallyCopyable()) 4406 return true; 4407 } 4408 } 4409 } 4410 4411 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4412 FE = RD->field_end(); 4413 FI != FE; ++FI) { 4414 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4415 continue; 4416 4417 QualType FieldType = Context.getBaseElementType(FI->getType()); 4418 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4419 4420 // For a default constructor, all references must be initialized in-class 4421 // and, if a union, it must have a non-const member. 4422 if (CSM == CXXDefaultConstructor) { 4423 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4424 return true; 4425 4426 if (IsUnion && !FieldType.isConstQualified()) 4427 AllConst = false; 4428 // For a copy constructor, data members must not be of rvalue reference 4429 // type. 4430 } else if (CSM == CXXCopyConstructor) { 4431 if (FieldType->isRValueReferenceType()) 4432 return true; 4433 } 4434 4435 if (FieldRecord) { 4436 // For a default constructor, a const member must have a user-provided 4437 // default constructor or else be explicitly initialized. 4438 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4439 !FI->hasInClassInitializer() && 4440 !FieldRecord->hasUserProvidedDefaultConstructor()) 4441 return true; 4442 4443 // Some additional restrictions exist on the variant members. 4444 if (!IsUnion && FieldRecord->isUnion() && 4445 FieldRecord->isAnonymousStructOrUnion()) { 4446 // We're okay to reuse AllConst here since we only care about the 4447 // value otherwise if we're in a union. 4448 AllConst = true; 4449 4450 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4451 UE = FieldRecord->field_end(); 4452 UI != UE; ++UI) { 4453 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4454 CXXRecordDecl *UnionFieldRecord = 4455 UnionFieldType->getAsCXXRecordDecl(); 4456 4457 if (!UnionFieldType.isConstQualified()) 4458 AllConst = false; 4459 4460 if (UnionFieldRecord) { 4461 // FIXME: Checking for accessibility and validity of this 4462 // destructor is technically going beyond the 4463 // standard, but this is believed to be a defect. 4464 if (!IsAssignment) { 4465 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4466 if (FieldDtor->isDeleted()) 4467 return true; 4468 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4469 AR_accessible) 4470 return true; 4471 if (!FieldDtor->isTrivial()) 4472 return true; 4473 } 4474 4475 if (CSM != CXXDestructor) { 4476 SpecialMemberOverloadResult *SMOR = 4477 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4478 false, false, false); 4479 // FIXME: Checking for accessibility and validity of this 4480 // corresponding member is technically going beyond the 4481 // standard, but this is believed to be a defect. 4482 if (!SMOR->hasSuccess()) 4483 return true; 4484 4485 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4486 // A member of a union must have a trivial corresponding 4487 // constructor. 4488 if (!FieldMember->isTrivial()) 4489 return true; 4490 4491 if (IsConstructor) { 4492 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4493 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4494 PDiag()) != AR_accessible) 4495 return true; 4496 } 4497 } 4498 } 4499 } 4500 4501 // At least one member in each anonymous union must be non-const 4502 if (CSM == CXXDefaultConstructor && AllConst) 4503 return true; 4504 4505 // Don't try to initialize the anonymous union 4506 // This is technically non-conformant, but sanity demands it. 4507 continue; 4508 } 4509 4510 // Unless we're doing assignment, the field's destructor must be 4511 // accessible and not deleted. 4512 if (!IsAssignment) { 4513 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4514 if (FieldDtor->isDeleted()) 4515 return true; 4516 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4517 AR_accessible) 4518 return true; 4519 } 4520 4521 // Check that the corresponding member of the field is accessible, 4522 // unique, and non-deleted. We don't do this if it has an explicit 4523 // initialization when default-constructing. 4524 if (CSM != CXXDestructor && 4525 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4526 SpecialMemberOverloadResult *SMOR = 4527 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4528 false); 4529 if (!SMOR->hasSuccess()) 4530 return true; 4531 4532 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4533 if (IsConstructor) { 4534 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4535 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4536 PDiag()) != AR_accessible) 4537 return true; 4538 4539 // For a move operation, the corresponding operation must actually 4540 // be a move operation (and not a copy selected by overload 4541 // resolution) unless we are working on a trivially copyable class. 4542 if (IsMove && !FieldCtor->isMoveConstructor() && 4543 !FieldRecord->isTriviallyCopyable()) 4544 return true; 4545 } 4546 4547 // We need the corresponding member of a union to be trivial so that 4548 // we can safely copy them all simultaneously. 4549 // FIXME: Note that performing the check here (where we rely on the lack 4550 // of an in-class initializer) is technically ill-formed. However, this 4551 // seems most obviously to be a bug in the standard. 4552 if (IsUnion && !FieldMember->isTrivial()) 4553 return true; 4554 } 4555 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4556 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4557 // We can't initialize a const member of non-class type to any value. 4558 return true; 4559 } 4560 } 4561 4562 // We can't have all const members in a union when default-constructing, 4563 // or else they're all nonsensical garbage values that can't be changed. 4564 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4565 return true; 4566 4567 return false; 4568} 4569 4570bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4571 CXXRecordDecl *RD = MD->getParent(); 4572 assert(!RD->isDependentType() && "do deletion after instantiation"); 4573 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4574 return false; 4575 4576 SourceLocation Loc = MD->getLocation(); 4577 4578 // Do access control from the constructor 4579 ContextRAII MethodContext(*this, MD); 4580 4581 bool Union = RD->isUnion(); 4582 4583 unsigned ArgQuals = 4584 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4585 Qualifiers::Const : 0; 4586 4587 // We do this because we should never actually use an anonymous 4588 // union's constructor. 4589 if (Union && RD->isAnonymousStructOrUnion()) 4590 return false; 4591 4592 // FIXME: We should put some diagnostic logic right into this function. 4593 4594 // C++0x [class.copy]/20 4595 // A defaulted [copy] assignment operator for class X is defined as deleted 4596 // if X has: 4597 4598 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4599 BE = RD->bases_end(); 4600 BI != BE; ++BI) { 4601 // We'll handle this one later 4602 if (BI->isVirtual()) 4603 continue; 4604 4605 QualType BaseType = BI->getType(); 4606 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4607 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4608 4609 // -- a [direct base class] B that cannot be [copied] because overload 4610 // resolution, as applied to B's [copy] assignment operator, results in 4611 // an ambiguity or a function that is deleted or inaccessible from the 4612 // assignment operator 4613 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4614 0); 4615 if (!CopyOper || CopyOper->isDeleted()) 4616 return true; 4617 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4618 return true; 4619 } 4620 4621 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4622 BE = RD->vbases_end(); 4623 BI != BE; ++BI) { 4624 QualType BaseType = BI->getType(); 4625 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4626 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4627 4628 // -- a [virtual base class] B that cannot be [copied] because overload 4629 // resolution, as applied to B's [copy] assignment operator, results in 4630 // an ambiguity or a function that is deleted or inaccessible from the 4631 // assignment operator 4632 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4633 0); 4634 if (!CopyOper || CopyOper->isDeleted()) 4635 return true; 4636 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4637 return true; 4638 } 4639 4640 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4641 FE = RD->field_end(); 4642 FI != FE; ++FI) { 4643 if (FI->isUnnamedBitfield()) 4644 continue; 4645 4646 QualType FieldType = Context.getBaseElementType(FI->getType()); 4647 4648 // -- a non-static data member of reference type 4649 if (FieldType->isReferenceType()) 4650 return true; 4651 4652 // -- a non-static data member of const non-class type (or array thereof) 4653 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4654 return true; 4655 4656 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4657 4658 if (FieldRecord) { 4659 // This is an anonymous union 4660 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4661 // Anonymous unions inside unions do not variant members create 4662 if (!Union) { 4663 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4664 UE = FieldRecord->field_end(); 4665 UI != UE; ++UI) { 4666 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4667 CXXRecordDecl *UnionFieldRecord = 4668 UnionFieldType->getAsCXXRecordDecl(); 4669 4670 // -- a variant member with a non-trivial [copy] assignment operator 4671 // and X is a union-like class 4672 if (UnionFieldRecord && 4673 !UnionFieldRecord->hasTrivialCopyAssignment()) 4674 return true; 4675 } 4676 } 4677 4678 // Don't try to initalize an anonymous union 4679 continue; 4680 // -- a variant member with a non-trivial [copy] assignment operator 4681 // and X is a union-like class 4682 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4683 return true; 4684 } 4685 4686 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4687 false, 0); 4688 if (!CopyOper || CopyOper->isDeleted()) 4689 return true; 4690 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4691 return true; 4692 } 4693 } 4694 4695 return false; 4696} 4697 4698bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4699 CXXRecordDecl *RD = MD->getParent(); 4700 assert(!RD->isDependentType() && "do deletion after instantiation"); 4701 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4702 return false; 4703 4704 SourceLocation Loc = MD->getLocation(); 4705 4706 // Do access control from the constructor 4707 ContextRAII MethodContext(*this, MD); 4708 4709 bool Union = RD->isUnion(); 4710 4711 // We do this because we should never actually use an anonymous 4712 // union's constructor. 4713 if (Union && RD->isAnonymousStructOrUnion()) 4714 return false; 4715 4716 // C++0x [class.copy]/20 4717 // A defaulted [move] assignment operator for class X is defined as deleted 4718 // if X has: 4719 4720 // -- for the move constructor, [...] any direct or indirect virtual base 4721 // class. 4722 if (RD->getNumVBases() != 0) 4723 return true; 4724 4725 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4726 BE = RD->bases_end(); 4727 BI != BE; ++BI) { 4728 4729 QualType BaseType = BI->getType(); 4730 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4731 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4732 4733 // -- a [direct base class] B that cannot be [moved] because overload 4734 // resolution, as applied to B's [move] assignment operator, results in 4735 // an ambiguity or a function that is deleted or inaccessible from the 4736 // assignment operator 4737 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4738 if (!MoveOper || MoveOper->isDeleted()) 4739 return true; 4740 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4741 return true; 4742 4743 // -- for the move assignment operator, a [direct base class] with a type 4744 // that does not have a move assignment operator and is not trivially 4745 // copyable. 4746 if (!MoveOper->isMoveAssignmentOperator() && 4747 !BaseDecl->isTriviallyCopyable()) 4748 return true; 4749 } 4750 4751 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4752 FE = RD->field_end(); 4753 FI != FE; ++FI) { 4754 if (FI->isUnnamedBitfield()) 4755 continue; 4756 4757 QualType FieldType = Context.getBaseElementType(FI->getType()); 4758 4759 // -- a non-static data member of reference type 4760 if (FieldType->isReferenceType()) 4761 return true; 4762 4763 // -- a non-static data member of const non-class type (or array thereof) 4764 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4765 return true; 4766 4767 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4768 4769 if (FieldRecord) { 4770 // This is an anonymous union 4771 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4772 // Anonymous unions inside unions do not variant members create 4773 if (!Union) { 4774 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4775 UE = FieldRecord->field_end(); 4776 UI != UE; ++UI) { 4777 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4778 CXXRecordDecl *UnionFieldRecord = 4779 UnionFieldType->getAsCXXRecordDecl(); 4780 4781 // -- a variant member with a non-trivial [move] assignment operator 4782 // and X is a union-like class 4783 if (UnionFieldRecord && 4784 !UnionFieldRecord->hasTrivialMoveAssignment()) 4785 return true; 4786 } 4787 } 4788 4789 // Don't try to initalize an anonymous union 4790 continue; 4791 // -- a variant member with a non-trivial [move] assignment operator 4792 // and X is a union-like class 4793 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4794 return true; 4795 } 4796 4797 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4798 if (!MoveOper || MoveOper->isDeleted()) 4799 return true; 4800 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4801 return true; 4802 4803 // -- for the move assignment operator, a [non-static data member] with a 4804 // type that does not have a move assignment operator and is not 4805 // trivially copyable. 4806 if (!MoveOper->isMoveAssignmentOperator() && 4807 !FieldRecord->isTriviallyCopyable()) 4808 return true; 4809 } 4810 } 4811 4812 return false; 4813} 4814 4815bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4816 CXXRecordDecl *RD = DD->getParent(); 4817 assert(!RD->isDependentType() && "do deletion after instantiation"); 4818 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4819 return false; 4820 4821 SourceLocation Loc = DD->getLocation(); 4822 4823 // Do access control from the destructor 4824 ContextRAII CtorContext(*this, DD); 4825 4826 bool Union = RD->isUnion(); 4827 4828 // We do this because we should never actually use an anonymous 4829 // union's destructor. 4830 if (Union && RD->isAnonymousStructOrUnion()) 4831 return false; 4832 4833 // C++0x [class.dtor]p5 4834 // A defaulted destructor for a class X is defined as deleted if: 4835 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4836 BE = RD->bases_end(); 4837 BI != BE; ++BI) { 4838 // We'll handle this one later 4839 if (BI->isVirtual()) 4840 continue; 4841 4842 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4843 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4844 assert(BaseDtor && "base has no destructor"); 4845 4846 // -- any direct or virtual base class has a deleted destructor or 4847 // a destructor that is inaccessible from the defaulted destructor 4848 if (BaseDtor->isDeleted()) 4849 return true; 4850 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4851 AR_accessible) 4852 return true; 4853 } 4854 4855 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4856 BE = RD->vbases_end(); 4857 BI != BE; ++BI) { 4858 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4859 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4860 assert(BaseDtor && "base has no destructor"); 4861 4862 // -- any direct or virtual base class has a deleted destructor or 4863 // a destructor that is inaccessible from the defaulted destructor 4864 if (BaseDtor->isDeleted()) 4865 return true; 4866 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4867 AR_accessible) 4868 return true; 4869 } 4870 4871 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4872 FE = RD->field_end(); 4873 FI != FE; ++FI) { 4874 QualType FieldType = Context.getBaseElementType(FI->getType()); 4875 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4876 if (FieldRecord) { 4877 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4878 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4879 UE = FieldRecord->field_end(); 4880 UI != UE; ++UI) { 4881 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4882 CXXRecordDecl *UnionFieldRecord = 4883 UnionFieldType->getAsCXXRecordDecl(); 4884 4885 // -- X is a union-like class that has a variant member with a non- 4886 // trivial destructor. 4887 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4888 return true; 4889 } 4890 // Technically we are supposed to do this next check unconditionally. 4891 // But that makes absolutely no sense. 4892 } else { 4893 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4894 4895 // -- any of the non-static data members has class type M (or array 4896 // thereof) and M has a deleted destructor or a destructor that is 4897 // inaccessible from the defaulted destructor 4898 if (FieldDtor->isDeleted()) 4899 return true; 4900 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4901 AR_accessible) 4902 return true; 4903 4904 // -- X is a union-like class that has a variant member with a non- 4905 // trivial destructor. 4906 if (Union && !FieldDtor->isTrivial()) 4907 return true; 4908 } 4909 } 4910 } 4911 4912 if (DD->isVirtual()) { 4913 FunctionDecl *OperatorDelete = 0; 4914 DeclarationName Name = 4915 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4916 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4917 false)) 4918 return true; 4919 } 4920 4921 4922 return false; 4923} 4924 4925/// \brief Data used with FindHiddenVirtualMethod 4926namespace { 4927 struct FindHiddenVirtualMethodData { 4928 Sema *S; 4929 CXXMethodDecl *Method; 4930 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4931 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4932 }; 4933} 4934 4935/// \brief Member lookup function that determines whether a given C++ 4936/// method overloads virtual methods in a base class without overriding any, 4937/// to be used with CXXRecordDecl::lookupInBases(). 4938static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4939 CXXBasePath &Path, 4940 void *UserData) { 4941 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4942 4943 FindHiddenVirtualMethodData &Data 4944 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4945 4946 DeclarationName Name = Data.Method->getDeclName(); 4947 assert(Name.getNameKind() == DeclarationName::Identifier); 4948 4949 bool foundSameNameMethod = false; 4950 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4951 for (Path.Decls = BaseRecord->lookup(Name); 4952 Path.Decls.first != Path.Decls.second; 4953 ++Path.Decls.first) { 4954 NamedDecl *D = *Path.Decls.first; 4955 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4956 MD = MD->getCanonicalDecl(); 4957 foundSameNameMethod = true; 4958 // Interested only in hidden virtual methods. 4959 if (!MD->isVirtual()) 4960 continue; 4961 // If the method we are checking overrides a method from its base 4962 // don't warn about the other overloaded methods. 4963 if (!Data.S->IsOverload(Data.Method, MD, false)) 4964 return true; 4965 // Collect the overload only if its hidden. 4966 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4967 overloadedMethods.push_back(MD); 4968 } 4969 } 4970 4971 if (foundSameNameMethod) 4972 Data.OverloadedMethods.append(overloadedMethods.begin(), 4973 overloadedMethods.end()); 4974 return foundSameNameMethod; 4975} 4976 4977/// \brief See if a method overloads virtual methods in a base class without 4978/// overriding any. 4979void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4980 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4981 MD->getLocation()) == DiagnosticsEngine::Ignored) 4982 return; 4983 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4984 return; 4985 4986 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4987 /*bool RecordPaths=*/false, 4988 /*bool DetectVirtual=*/false); 4989 FindHiddenVirtualMethodData Data; 4990 Data.Method = MD; 4991 Data.S = this; 4992 4993 // Keep the base methods that were overriden or introduced in the subclass 4994 // by 'using' in a set. A base method not in this set is hidden. 4995 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4996 res.first != res.second; ++res.first) { 4997 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4998 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4999 E = MD->end_overridden_methods(); 5000 I != E; ++I) 5001 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 5002 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 5003 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 5004 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 5005 } 5006 5007 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5008 !Data.OverloadedMethods.empty()) { 5009 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5010 << MD << (Data.OverloadedMethods.size() > 1); 5011 5012 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5013 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5014 Diag(overloadedMD->getLocation(), 5015 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5016 } 5017 } 5018} 5019 5020void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5021 Decl *TagDecl, 5022 SourceLocation LBrac, 5023 SourceLocation RBrac, 5024 AttributeList *AttrList) { 5025 if (!TagDecl) 5026 return; 5027 5028 AdjustDeclIfTemplate(TagDecl); 5029 5030 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5031 // strict aliasing violation! 5032 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5033 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5034 5035 CheckCompletedCXXClass( 5036 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5037} 5038 5039/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5040/// special functions, such as the default constructor, copy 5041/// constructor, or destructor, to the given C++ class (C++ 5042/// [special]p1). This routine can only be executed just before the 5043/// definition of the class is complete. 5044void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5045 if (!ClassDecl->hasUserDeclaredConstructor()) 5046 ++ASTContext::NumImplicitDefaultConstructors; 5047 5048 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5049 ++ASTContext::NumImplicitCopyConstructors; 5050 5051 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5052 ++ASTContext::NumImplicitMoveConstructors; 5053 5054 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5055 ++ASTContext::NumImplicitCopyAssignmentOperators; 5056 5057 // If we have a dynamic class, then the copy assignment operator may be 5058 // virtual, so we have to declare it immediately. This ensures that, e.g., 5059 // it shows up in the right place in the vtable and that we diagnose 5060 // problems with the implicit exception specification. 5061 if (ClassDecl->isDynamicClass()) 5062 DeclareImplicitCopyAssignment(ClassDecl); 5063 } 5064 5065 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5066 ++ASTContext::NumImplicitMoveAssignmentOperators; 5067 5068 // Likewise for the move assignment operator. 5069 if (ClassDecl->isDynamicClass()) 5070 DeclareImplicitMoveAssignment(ClassDecl); 5071 } 5072 5073 if (!ClassDecl->hasUserDeclaredDestructor()) { 5074 ++ASTContext::NumImplicitDestructors; 5075 5076 // If we have a dynamic class, then the destructor may be virtual, so we 5077 // have to declare the destructor immediately. This ensures that, e.g., it 5078 // shows up in the right place in the vtable and that we diagnose problems 5079 // with the implicit exception specification. 5080 if (ClassDecl->isDynamicClass()) 5081 DeclareImplicitDestructor(ClassDecl); 5082 } 5083} 5084 5085void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5086 if (!D) 5087 return; 5088 5089 int NumParamList = D->getNumTemplateParameterLists(); 5090 for (int i = 0; i < NumParamList; i++) { 5091 TemplateParameterList* Params = D->getTemplateParameterList(i); 5092 for (TemplateParameterList::iterator Param = Params->begin(), 5093 ParamEnd = Params->end(); 5094 Param != ParamEnd; ++Param) { 5095 NamedDecl *Named = cast<NamedDecl>(*Param); 5096 if (Named->getDeclName()) { 5097 S->AddDecl(Named); 5098 IdResolver.AddDecl(Named); 5099 } 5100 } 5101 } 5102} 5103 5104void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5105 if (!D) 5106 return; 5107 5108 TemplateParameterList *Params = 0; 5109 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5110 Params = Template->getTemplateParameters(); 5111 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5112 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5113 Params = PartialSpec->getTemplateParameters(); 5114 else 5115 return; 5116 5117 for (TemplateParameterList::iterator Param = Params->begin(), 5118 ParamEnd = Params->end(); 5119 Param != ParamEnd; ++Param) { 5120 NamedDecl *Named = cast<NamedDecl>(*Param); 5121 if (Named->getDeclName()) { 5122 S->AddDecl(Named); 5123 IdResolver.AddDecl(Named); 5124 } 5125 } 5126} 5127 5128void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5129 if (!RecordD) return; 5130 AdjustDeclIfTemplate(RecordD); 5131 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5132 PushDeclContext(S, Record); 5133} 5134 5135void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5136 if (!RecordD) return; 5137 PopDeclContext(); 5138} 5139 5140/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5141/// parsing a top-level (non-nested) C++ class, and we are now 5142/// parsing those parts of the given Method declaration that could 5143/// not be parsed earlier (C++ [class.mem]p2), such as default 5144/// arguments. This action should enter the scope of the given 5145/// Method declaration as if we had just parsed the qualified method 5146/// name. However, it should not bring the parameters into scope; 5147/// that will be performed by ActOnDelayedCXXMethodParameter. 5148void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5149} 5150 5151/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5152/// C++ method declaration. We're (re-)introducing the given 5153/// function parameter into scope for use in parsing later parts of 5154/// the method declaration. For example, we could see an 5155/// ActOnParamDefaultArgument event for this parameter. 5156void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5157 if (!ParamD) 5158 return; 5159 5160 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5161 5162 // If this parameter has an unparsed default argument, clear it out 5163 // to make way for the parsed default argument. 5164 if (Param->hasUnparsedDefaultArg()) 5165 Param->setDefaultArg(0); 5166 5167 S->AddDecl(Param); 5168 if (Param->getDeclName()) 5169 IdResolver.AddDecl(Param); 5170} 5171 5172/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5173/// processing the delayed method declaration for Method. The method 5174/// declaration is now considered finished. There may be a separate 5175/// ActOnStartOfFunctionDef action later (not necessarily 5176/// immediately!) for this method, if it was also defined inside the 5177/// class body. 5178void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5179 if (!MethodD) 5180 return; 5181 5182 AdjustDeclIfTemplate(MethodD); 5183 5184 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5185 5186 // Now that we have our default arguments, check the constructor 5187 // again. It could produce additional diagnostics or affect whether 5188 // the class has implicitly-declared destructors, among other 5189 // things. 5190 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5191 CheckConstructor(Constructor); 5192 5193 // Check the default arguments, which we may have added. 5194 if (!Method->isInvalidDecl()) 5195 CheckCXXDefaultArguments(Method); 5196} 5197 5198/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5199/// the well-formedness of the constructor declarator @p D with type @p 5200/// R. If there are any errors in the declarator, this routine will 5201/// emit diagnostics and set the invalid bit to true. In any case, the type 5202/// will be updated to reflect a well-formed type for the constructor and 5203/// returned. 5204QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5205 StorageClass &SC) { 5206 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5207 5208 // C++ [class.ctor]p3: 5209 // A constructor shall not be virtual (10.3) or static (9.4). A 5210 // constructor can be invoked for a const, volatile or const 5211 // volatile object. A constructor shall not be declared const, 5212 // volatile, or const volatile (9.3.2). 5213 if (isVirtual) { 5214 if (!D.isInvalidType()) 5215 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5216 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5217 << SourceRange(D.getIdentifierLoc()); 5218 D.setInvalidType(); 5219 } 5220 if (SC == SC_Static) { 5221 if (!D.isInvalidType()) 5222 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5223 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5224 << SourceRange(D.getIdentifierLoc()); 5225 D.setInvalidType(); 5226 SC = SC_None; 5227 } 5228 5229 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5230 if (FTI.TypeQuals != 0) { 5231 if (FTI.TypeQuals & Qualifiers::Const) 5232 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5233 << "const" << SourceRange(D.getIdentifierLoc()); 5234 if (FTI.TypeQuals & Qualifiers::Volatile) 5235 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5236 << "volatile" << SourceRange(D.getIdentifierLoc()); 5237 if (FTI.TypeQuals & Qualifiers::Restrict) 5238 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5239 << "restrict" << SourceRange(D.getIdentifierLoc()); 5240 D.setInvalidType(); 5241 } 5242 5243 // C++0x [class.ctor]p4: 5244 // A constructor shall not be declared with a ref-qualifier. 5245 if (FTI.hasRefQualifier()) { 5246 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5247 << FTI.RefQualifierIsLValueRef 5248 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5249 D.setInvalidType(); 5250 } 5251 5252 // Rebuild the function type "R" without any type qualifiers (in 5253 // case any of the errors above fired) and with "void" as the 5254 // return type, since constructors don't have return types. 5255 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5256 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5257 return R; 5258 5259 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5260 EPI.TypeQuals = 0; 5261 EPI.RefQualifier = RQ_None; 5262 5263 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5264 Proto->getNumArgs(), EPI); 5265} 5266 5267/// CheckConstructor - Checks a fully-formed constructor for 5268/// well-formedness, issuing any diagnostics required. Returns true if 5269/// the constructor declarator is invalid. 5270void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5271 CXXRecordDecl *ClassDecl 5272 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5273 if (!ClassDecl) 5274 return Constructor->setInvalidDecl(); 5275 5276 // C++ [class.copy]p3: 5277 // A declaration of a constructor for a class X is ill-formed if 5278 // its first parameter is of type (optionally cv-qualified) X and 5279 // either there are no other parameters or else all other 5280 // parameters have default arguments. 5281 if (!Constructor->isInvalidDecl() && 5282 ((Constructor->getNumParams() == 1) || 5283 (Constructor->getNumParams() > 1 && 5284 Constructor->getParamDecl(1)->hasDefaultArg())) && 5285 Constructor->getTemplateSpecializationKind() 5286 != TSK_ImplicitInstantiation) { 5287 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5288 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5289 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5290 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5291 const char *ConstRef 5292 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5293 : " const &"; 5294 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5295 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5296 5297 // FIXME: Rather that making the constructor invalid, we should endeavor 5298 // to fix the type. 5299 Constructor->setInvalidDecl(); 5300 } 5301 } 5302} 5303 5304/// CheckDestructor - Checks a fully-formed destructor definition for 5305/// well-formedness, issuing any diagnostics required. Returns true 5306/// on error. 5307bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5308 CXXRecordDecl *RD = Destructor->getParent(); 5309 5310 if (Destructor->isVirtual()) { 5311 SourceLocation Loc; 5312 5313 if (!Destructor->isImplicit()) 5314 Loc = Destructor->getLocation(); 5315 else 5316 Loc = RD->getLocation(); 5317 5318 // If we have a virtual destructor, look up the deallocation function 5319 FunctionDecl *OperatorDelete = 0; 5320 DeclarationName Name = 5321 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5322 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5323 return true; 5324 5325 MarkFunctionReferenced(Loc, OperatorDelete); 5326 5327 Destructor->setOperatorDelete(OperatorDelete); 5328 } 5329 5330 return false; 5331} 5332 5333static inline bool 5334FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5335 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5336 FTI.ArgInfo[0].Param && 5337 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5338} 5339 5340/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5341/// the well-formednes of the destructor declarator @p D with type @p 5342/// R. If there are any errors in the declarator, this routine will 5343/// emit diagnostics and set the declarator to invalid. Even if this happens, 5344/// will be updated to reflect a well-formed type for the destructor and 5345/// returned. 5346QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5347 StorageClass& SC) { 5348 // C++ [class.dtor]p1: 5349 // [...] A typedef-name that names a class is a class-name 5350 // (7.1.3); however, a typedef-name that names a class shall not 5351 // be used as the identifier in the declarator for a destructor 5352 // declaration. 5353 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5354 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5355 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5356 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5357 else if (const TemplateSpecializationType *TST = 5358 DeclaratorType->getAs<TemplateSpecializationType>()) 5359 if (TST->isTypeAlias()) 5360 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5361 << DeclaratorType << 1; 5362 5363 // C++ [class.dtor]p2: 5364 // A destructor is used to destroy objects of its class type. A 5365 // destructor takes no parameters, and no return type can be 5366 // specified for it (not even void). The address of a destructor 5367 // shall not be taken. A destructor shall not be static. A 5368 // destructor can be invoked for a const, volatile or const 5369 // volatile object. A destructor shall not be declared const, 5370 // volatile or const volatile (9.3.2). 5371 if (SC == SC_Static) { 5372 if (!D.isInvalidType()) 5373 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5374 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5375 << SourceRange(D.getIdentifierLoc()) 5376 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5377 5378 SC = SC_None; 5379 } 5380 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5381 // Destructors don't have return types, but the parser will 5382 // happily parse something like: 5383 // 5384 // class X { 5385 // float ~X(); 5386 // }; 5387 // 5388 // The return type will be eliminated later. 5389 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5390 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5391 << SourceRange(D.getIdentifierLoc()); 5392 } 5393 5394 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5395 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5396 if (FTI.TypeQuals & Qualifiers::Const) 5397 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5398 << "const" << SourceRange(D.getIdentifierLoc()); 5399 if (FTI.TypeQuals & Qualifiers::Volatile) 5400 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5401 << "volatile" << SourceRange(D.getIdentifierLoc()); 5402 if (FTI.TypeQuals & Qualifiers::Restrict) 5403 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5404 << "restrict" << SourceRange(D.getIdentifierLoc()); 5405 D.setInvalidType(); 5406 } 5407 5408 // C++0x [class.dtor]p2: 5409 // A destructor shall not be declared with a ref-qualifier. 5410 if (FTI.hasRefQualifier()) { 5411 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5412 << FTI.RefQualifierIsLValueRef 5413 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5414 D.setInvalidType(); 5415 } 5416 5417 // Make sure we don't have any parameters. 5418 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5419 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5420 5421 // Delete the parameters. 5422 FTI.freeArgs(); 5423 D.setInvalidType(); 5424 } 5425 5426 // Make sure the destructor isn't variadic. 5427 if (FTI.isVariadic) { 5428 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5429 D.setInvalidType(); 5430 } 5431 5432 // Rebuild the function type "R" without any type qualifiers or 5433 // parameters (in case any of the errors above fired) and with 5434 // "void" as the return type, since destructors don't have return 5435 // types. 5436 if (!D.isInvalidType()) 5437 return R; 5438 5439 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5440 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5441 EPI.Variadic = false; 5442 EPI.TypeQuals = 0; 5443 EPI.RefQualifier = RQ_None; 5444 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5445} 5446 5447/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5448/// well-formednes of the conversion function declarator @p D with 5449/// type @p R. If there are any errors in the declarator, this routine 5450/// will emit diagnostics and return true. Otherwise, it will return 5451/// false. Either way, the type @p R will be updated to reflect a 5452/// well-formed type for the conversion operator. 5453void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5454 StorageClass& SC) { 5455 // C++ [class.conv.fct]p1: 5456 // Neither parameter types nor return type can be specified. The 5457 // type of a conversion function (8.3.5) is "function taking no 5458 // parameter returning conversion-type-id." 5459 if (SC == SC_Static) { 5460 if (!D.isInvalidType()) 5461 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5462 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5463 << SourceRange(D.getIdentifierLoc()); 5464 D.setInvalidType(); 5465 SC = SC_None; 5466 } 5467 5468 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5469 5470 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5471 // Conversion functions don't have return types, but the parser will 5472 // happily parse something like: 5473 // 5474 // class X { 5475 // float operator bool(); 5476 // }; 5477 // 5478 // The return type will be changed later anyway. 5479 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5480 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5481 << SourceRange(D.getIdentifierLoc()); 5482 D.setInvalidType(); 5483 } 5484 5485 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5486 5487 // Make sure we don't have any parameters. 5488 if (Proto->getNumArgs() > 0) { 5489 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5490 5491 // Delete the parameters. 5492 D.getFunctionTypeInfo().freeArgs(); 5493 D.setInvalidType(); 5494 } else if (Proto->isVariadic()) { 5495 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5496 D.setInvalidType(); 5497 } 5498 5499 // Diagnose "&operator bool()" and other such nonsense. This 5500 // is actually a gcc extension which we don't support. 5501 if (Proto->getResultType() != ConvType) { 5502 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5503 << Proto->getResultType(); 5504 D.setInvalidType(); 5505 ConvType = Proto->getResultType(); 5506 } 5507 5508 // C++ [class.conv.fct]p4: 5509 // The conversion-type-id shall not represent a function type nor 5510 // an array type. 5511 if (ConvType->isArrayType()) { 5512 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5513 ConvType = Context.getPointerType(ConvType); 5514 D.setInvalidType(); 5515 } else if (ConvType->isFunctionType()) { 5516 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5517 ConvType = Context.getPointerType(ConvType); 5518 D.setInvalidType(); 5519 } 5520 5521 // Rebuild the function type "R" without any parameters (in case any 5522 // of the errors above fired) and with the conversion type as the 5523 // return type. 5524 if (D.isInvalidType()) 5525 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5526 5527 // C++0x explicit conversion operators. 5528 if (D.getDeclSpec().isExplicitSpecified()) 5529 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5530 getLangOptions().CPlusPlus0x ? 5531 diag::warn_cxx98_compat_explicit_conversion_functions : 5532 diag::ext_explicit_conversion_functions) 5533 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5534} 5535 5536/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5537/// the declaration of the given C++ conversion function. This routine 5538/// is responsible for recording the conversion function in the C++ 5539/// class, if possible. 5540Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5541 assert(Conversion && "Expected to receive a conversion function declaration"); 5542 5543 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5544 5545 // Make sure we aren't redeclaring the conversion function. 5546 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5547 5548 // C++ [class.conv.fct]p1: 5549 // [...] A conversion function is never used to convert a 5550 // (possibly cv-qualified) object to the (possibly cv-qualified) 5551 // same object type (or a reference to it), to a (possibly 5552 // cv-qualified) base class of that type (or a reference to it), 5553 // or to (possibly cv-qualified) void. 5554 // FIXME: Suppress this warning if the conversion function ends up being a 5555 // virtual function that overrides a virtual function in a base class. 5556 QualType ClassType 5557 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5558 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5559 ConvType = ConvTypeRef->getPointeeType(); 5560 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5561 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5562 /* Suppress diagnostics for instantiations. */; 5563 else if (ConvType->isRecordType()) { 5564 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5565 if (ConvType == ClassType) 5566 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5567 << ClassType; 5568 else if (IsDerivedFrom(ClassType, ConvType)) 5569 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5570 << ClassType << ConvType; 5571 } else if (ConvType->isVoidType()) { 5572 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5573 << ClassType << ConvType; 5574 } 5575 5576 if (FunctionTemplateDecl *ConversionTemplate 5577 = Conversion->getDescribedFunctionTemplate()) 5578 return ConversionTemplate; 5579 5580 return Conversion; 5581} 5582 5583//===----------------------------------------------------------------------===// 5584// Namespace Handling 5585//===----------------------------------------------------------------------===// 5586 5587 5588 5589/// ActOnStartNamespaceDef - This is called at the start of a namespace 5590/// definition. 5591Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5592 SourceLocation InlineLoc, 5593 SourceLocation NamespaceLoc, 5594 SourceLocation IdentLoc, 5595 IdentifierInfo *II, 5596 SourceLocation LBrace, 5597 AttributeList *AttrList) { 5598 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5599 // For anonymous namespace, take the location of the left brace. 5600 SourceLocation Loc = II ? IdentLoc : LBrace; 5601 bool IsInline = InlineLoc.isValid(); 5602 bool IsInvalid = false; 5603 bool IsStd = false; 5604 bool AddToKnown = false; 5605 Scope *DeclRegionScope = NamespcScope->getParent(); 5606 5607 NamespaceDecl *PrevNS = 0; 5608 if (II) { 5609 // C++ [namespace.def]p2: 5610 // The identifier in an original-namespace-definition shall not 5611 // have been previously defined in the declarative region in 5612 // which the original-namespace-definition appears. The 5613 // identifier in an original-namespace-definition is the name of 5614 // the namespace. Subsequently in that declarative region, it is 5615 // treated as an original-namespace-name. 5616 // 5617 // Since namespace names are unique in their scope, and we don't 5618 // look through using directives, just look for any ordinary names. 5619 5620 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5621 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5622 Decl::IDNS_Namespace; 5623 NamedDecl *PrevDecl = 0; 5624 for (DeclContext::lookup_result R 5625 = CurContext->getRedeclContext()->lookup(II); 5626 R.first != R.second; ++R.first) { 5627 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5628 PrevDecl = *R.first; 5629 break; 5630 } 5631 } 5632 5633 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5634 5635 if (PrevNS) { 5636 // This is an extended namespace definition. 5637 if (IsInline != PrevNS->isInline()) { 5638 // inline-ness must match 5639 if (PrevNS->isInline()) { 5640 // The user probably just forgot the 'inline', so suggest that it 5641 // be added back. 5642 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5643 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5644 } else { 5645 Diag(Loc, diag::err_inline_namespace_mismatch) 5646 << IsInline; 5647 } 5648 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5649 5650 IsInline = PrevNS->isInline(); 5651 } 5652 } else if (PrevDecl) { 5653 // This is an invalid name redefinition. 5654 Diag(Loc, diag::err_redefinition_different_kind) 5655 << II; 5656 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5657 IsInvalid = true; 5658 // Continue on to push Namespc as current DeclContext and return it. 5659 } else if (II->isStr("std") && 5660 CurContext->getRedeclContext()->isTranslationUnit()) { 5661 // This is the first "real" definition of the namespace "std", so update 5662 // our cache of the "std" namespace to point at this definition. 5663 PrevNS = getStdNamespace(); 5664 IsStd = true; 5665 AddToKnown = !IsInline; 5666 } else { 5667 // We've seen this namespace for the first time. 5668 AddToKnown = !IsInline; 5669 } 5670 } else { 5671 // Anonymous namespaces. 5672 5673 // Determine whether the parent already has an anonymous namespace. 5674 DeclContext *Parent = CurContext->getRedeclContext(); 5675 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5676 PrevNS = TU->getAnonymousNamespace(); 5677 } else { 5678 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5679 PrevNS = ND->getAnonymousNamespace(); 5680 } 5681 5682 if (PrevNS && IsInline != PrevNS->isInline()) { 5683 // inline-ness must match 5684 Diag(Loc, diag::err_inline_namespace_mismatch) 5685 << IsInline; 5686 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5687 5688 // Recover by ignoring the new namespace's inline status. 5689 IsInline = PrevNS->isInline(); 5690 } 5691 } 5692 5693 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5694 StartLoc, Loc, II, PrevNS); 5695 if (IsInvalid) 5696 Namespc->setInvalidDecl(); 5697 5698 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5699 5700 // FIXME: Should we be merging attributes? 5701 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5702 PushNamespaceVisibilityAttr(Attr, Loc); 5703 5704 if (IsStd) 5705 StdNamespace = Namespc; 5706 if (AddToKnown) 5707 KnownNamespaces[Namespc] = false; 5708 5709 if (II) { 5710 PushOnScopeChains(Namespc, DeclRegionScope); 5711 } else { 5712 // Link the anonymous namespace into its parent. 5713 DeclContext *Parent = CurContext->getRedeclContext(); 5714 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5715 TU->setAnonymousNamespace(Namespc); 5716 } else { 5717 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5718 } 5719 5720 CurContext->addDecl(Namespc); 5721 5722 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5723 // behaves as if it were replaced by 5724 // namespace unique { /* empty body */ } 5725 // using namespace unique; 5726 // namespace unique { namespace-body } 5727 // where all occurrences of 'unique' in a translation unit are 5728 // replaced by the same identifier and this identifier differs 5729 // from all other identifiers in the entire program. 5730 5731 // We just create the namespace with an empty name and then add an 5732 // implicit using declaration, just like the standard suggests. 5733 // 5734 // CodeGen enforces the "universally unique" aspect by giving all 5735 // declarations semantically contained within an anonymous 5736 // namespace internal linkage. 5737 5738 if (!PrevNS) { 5739 UsingDirectiveDecl* UD 5740 = UsingDirectiveDecl::Create(Context, CurContext, 5741 /* 'using' */ LBrace, 5742 /* 'namespace' */ SourceLocation(), 5743 /* qualifier */ NestedNameSpecifierLoc(), 5744 /* identifier */ SourceLocation(), 5745 Namespc, 5746 /* Ancestor */ CurContext); 5747 UD->setImplicit(); 5748 CurContext->addDecl(UD); 5749 } 5750 } 5751 5752 // Although we could have an invalid decl (i.e. the namespace name is a 5753 // redefinition), push it as current DeclContext and try to continue parsing. 5754 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5755 // for the namespace has the declarations that showed up in that particular 5756 // namespace definition. 5757 PushDeclContext(NamespcScope, Namespc); 5758 return Namespc; 5759} 5760 5761/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5762/// is a namespace alias, returns the namespace it points to. 5763static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5764 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5765 return AD->getNamespace(); 5766 return dyn_cast_or_null<NamespaceDecl>(D); 5767} 5768 5769/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5770/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5771void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5772 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5773 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5774 Namespc->setRBraceLoc(RBrace); 5775 PopDeclContext(); 5776 if (Namespc->hasAttr<VisibilityAttr>()) 5777 PopPragmaVisibility(true, RBrace); 5778} 5779 5780CXXRecordDecl *Sema::getStdBadAlloc() const { 5781 return cast_or_null<CXXRecordDecl>( 5782 StdBadAlloc.get(Context.getExternalSource())); 5783} 5784 5785NamespaceDecl *Sema::getStdNamespace() const { 5786 return cast_or_null<NamespaceDecl>( 5787 StdNamespace.get(Context.getExternalSource())); 5788} 5789 5790/// \brief Retrieve the special "std" namespace, which may require us to 5791/// implicitly define the namespace. 5792NamespaceDecl *Sema::getOrCreateStdNamespace() { 5793 if (!StdNamespace) { 5794 // The "std" namespace has not yet been defined, so build one implicitly. 5795 StdNamespace = NamespaceDecl::Create(Context, 5796 Context.getTranslationUnitDecl(), 5797 /*Inline=*/false, 5798 SourceLocation(), SourceLocation(), 5799 &PP.getIdentifierTable().get("std"), 5800 /*PrevDecl=*/0); 5801 getStdNamespace()->setImplicit(true); 5802 } 5803 5804 return getStdNamespace(); 5805} 5806 5807bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5808 assert(getLangOptions().CPlusPlus && 5809 "Looking for std::initializer_list outside of C++."); 5810 5811 // We're looking for implicit instantiations of 5812 // template <typename E> class std::initializer_list. 5813 5814 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5815 return false; 5816 5817 ClassTemplateDecl *Template = 0; 5818 const TemplateArgument *Arguments = 0; 5819 5820 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5821 5822 ClassTemplateSpecializationDecl *Specialization = 5823 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5824 if (!Specialization) 5825 return false; 5826 5827 Template = Specialization->getSpecializedTemplate(); 5828 Arguments = Specialization->getTemplateArgs().data(); 5829 } else if (const TemplateSpecializationType *TST = 5830 Ty->getAs<TemplateSpecializationType>()) { 5831 Template = dyn_cast_or_null<ClassTemplateDecl>( 5832 TST->getTemplateName().getAsTemplateDecl()); 5833 Arguments = TST->getArgs(); 5834 } 5835 if (!Template) 5836 return false; 5837 5838 if (!StdInitializerList) { 5839 // Haven't recognized std::initializer_list yet, maybe this is it. 5840 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5841 if (TemplateClass->getIdentifier() != 5842 &PP.getIdentifierTable().get("initializer_list") || 5843 !getStdNamespace()->InEnclosingNamespaceSetOf( 5844 TemplateClass->getDeclContext())) 5845 return false; 5846 // This is a template called std::initializer_list, but is it the right 5847 // template? 5848 TemplateParameterList *Params = Template->getTemplateParameters(); 5849 if (Params->getMinRequiredArguments() != 1) 5850 return false; 5851 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5852 return false; 5853 5854 // It's the right template. 5855 StdInitializerList = Template; 5856 } 5857 5858 if (Template != StdInitializerList) 5859 return false; 5860 5861 // This is an instance of std::initializer_list. Find the argument type. 5862 if (Element) 5863 *Element = Arguments[0].getAsType(); 5864 return true; 5865} 5866 5867static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5868 NamespaceDecl *Std = S.getStdNamespace(); 5869 if (!Std) { 5870 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5871 return 0; 5872 } 5873 5874 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5875 Loc, Sema::LookupOrdinaryName); 5876 if (!S.LookupQualifiedName(Result, Std)) { 5877 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5878 return 0; 5879 } 5880 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5881 if (!Template) { 5882 Result.suppressDiagnostics(); 5883 // We found something weird. Complain about the first thing we found. 5884 NamedDecl *Found = *Result.begin(); 5885 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5886 return 0; 5887 } 5888 5889 // We found some template called std::initializer_list. Now verify that it's 5890 // correct. 5891 TemplateParameterList *Params = Template->getTemplateParameters(); 5892 if (Params->getMinRequiredArguments() != 1 || 5893 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5894 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5895 return 0; 5896 } 5897 5898 return Template; 5899} 5900 5901QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5902 if (!StdInitializerList) { 5903 StdInitializerList = LookupStdInitializerList(*this, Loc); 5904 if (!StdInitializerList) 5905 return QualType(); 5906 } 5907 5908 TemplateArgumentListInfo Args(Loc, Loc); 5909 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5910 Context.getTrivialTypeSourceInfo(Element, 5911 Loc))); 5912 return Context.getCanonicalType( 5913 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5914} 5915 5916bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5917 // C++ [dcl.init.list]p2: 5918 // A constructor is an initializer-list constructor if its first parameter 5919 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5920 // std::initializer_list<E> for some type E, and either there are no other 5921 // parameters or else all other parameters have default arguments. 5922 if (Ctor->getNumParams() < 1 || 5923 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5924 return false; 5925 5926 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5927 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5928 ArgType = RT->getPointeeType().getUnqualifiedType(); 5929 5930 return isStdInitializerList(ArgType, 0); 5931} 5932 5933/// \brief Determine whether a using statement is in a context where it will be 5934/// apply in all contexts. 5935static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5936 switch (CurContext->getDeclKind()) { 5937 case Decl::TranslationUnit: 5938 return true; 5939 case Decl::LinkageSpec: 5940 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5941 default: 5942 return false; 5943 } 5944} 5945 5946namespace { 5947 5948// Callback to only accept typo corrections that are namespaces. 5949class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5950 public: 5951 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5952 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5953 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5954 } 5955 return false; 5956 } 5957}; 5958 5959} 5960 5961static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5962 CXXScopeSpec &SS, 5963 SourceLocation IdentLoc, 5964 IdentifierInfo *Ident) { 5965 NamespaceValidatorCCC Validator; 5966 R.clear(); 5967 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5968 R.getLookupKind(), Sc, &SS, 5969 Validator)) { 5970 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5971 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5972 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5973 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5974 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5975 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5976 else 5977 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5978 << Ident << CorrectedQuotedStr 5979 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5980 5981 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5982 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5983 5984 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5985 R.addDecl(Corrected.getCorrectionDecl()); 5986 return true; 5987 } 5988 return false; 5989} 5990 5991Decl *Sema::ActOnUsingDirective(Scope *S, 5992 SourceLocation UsingLoc, 5993 SourceLocation NamespcLoc, 5994 CXXScopeSpec &SS, 5995 SourceLocation IdentLoc, 5996 IdentifierInfo *NamespcName, 5997 AttributeList *AttrList) { 5998 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5999 assert(NamespcName && "Invalid NamespcName."); 6000 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6001 6002 // This can only happen along a recovery path. 6003 while (S->getFlags() & Scope::TemplateParamScope) 6004 S = S->getParent(); 6005 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6006 6007 UsingDirectiveDecl *UDir = 0; 6008 NestedNameSpecifier *Qualifier = 0; 6009 if (SS.isSet()) 6010 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6011 6012 // Lookup namespace name. 6013 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6014 LookupParsedName(R, S, &SS); 6015 if (R.isAmbiguous()) 6016 return 0; 6017 6018 if (R.empty()) { 6019 R.clear(); 6020 // Allow "using namespace std;" or "using namespace ::std;" even if 6021 // "std" hasn't been defined yet, for GCC compatibility. 6022 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6023 NamespcName->isStr("std")) { 6024 Diag(IdentLoc, diag::ext_using_undefined_std); 6025 R.addDecl(getOrCreateStdNamespace()); 6026 R.resolveKind(); 6027 } 6028 // Otherwise, attempt typo correction. 6029 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6030 } 6031 6032 if (!R.empty()) { 6033 NamedDecl *Named = R.getFoundDecl(); 6034 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6035 && "expected namespace decl"); 6036 // C++ [namespace.udir]p1: 6037 // A using-directive specifies that the names in the nominated 6038 // namespace can be used in the scope in which the 6039 // using-directive appears after the using-directive. During 6040 // unqualified name lookup (3.4.1), the names appear as if they 6041 // were declared in the nearest enclosing namespace which 6042 // contains both the using-directive and the nominated 6043 // namespace. [Note: in this context, "contains" means "contains 6044 // directly or indirectly". ] 6045 6046 // Find enclosing context containing both using-directive and 6047 // nominated namespace. 6048 NamespaceDecl *NS = getNamespaceDecl(Named); 6049 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6050 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6051 CommonAncestor = CommonAncestor->getParent(); 6052 6053 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6054 SS.getWithLocInContext(Context), 6055 IdentLoc, Named, CommonAncestor); 6056 6057 if (IsUsingDirectiveInToplevelContext(CurContext) && 6058 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6059 Diag(IdentLoc, diag::warn_using_directive_in_header); 6060 } 6061 6062 PushUsingDirective(S, UDir); 6063 } else { 6064 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6065 } 6066 6067 // FIXME: We ignore attributes for now. 6068 return UDir; 6069} 6070 6071void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6072 // If scope has associated entity, then using directive is at namespace 6073 // or translation unit scope. We add UsingDirectiveDecls, into 6074 // it's lookup structure. 6075 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6076 Ctx->addDecl(UDir); 6077 else 6078 // Otherwise it is block-sope. using-directives will affect lookup 6079 // only to the end of scope. 6080 S->PushUsingDirective(UDir); 6081} 6082 6083 6084Decl *Sema::ActOnUsingDeclaration(Scope *S, 6085 AccessSpecifier AS, 6086 bool HasUsingKeyword, 6087 SourceLocation UsingLoc, 6088 CXXScopeSpec &SS, 6089 UnqualifiedId &Name, 6090 AttributeList *AttrList, 6091 bool IsTypeName, 6092 SourceLocation TypenameLoc) { 6093 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6094 6095 switch (Name.getKind()) { 6096 case UnqualifiedId::IK_ImplicitSelfParam: 6097 case UnqualifiedId::IK_Identifier: 6098 case UnqualifiedId::IK_OperatorFunctionId: 6099 case UnqualifiedId::IK_LiteralOperatorId: 6100 case UnqualifiedId::IK_ConversionFunctionId: 6101 break; 6102 6103 case UnqualifiedId::IK_ConstructorName: 6104 case UnqualifiedId::IK_ConstructorTemplateId: 6105 // C++0x inherited constructors. 6106 Diag(Name.getSourceRange().getBegin(), 6107 getLangOptions().CPlusPlus0x ? 6108 diag::warn_cxx98_compat_using_decl_constructor : 6109 diag::err_using_decl_constructor) 6110 << SS.getRange(); 6111 6112 if (getLangOptions().CPlusPlus0x) break; 6113 6114 return 0; 6115 6116 case UnqualifiedId::IK_DestructorName: 6117 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6118 << SS.getRange(); 6119 return 0; 6120 6121 case UnqualifiedId::IK_TemplateId: 6122 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6123 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6124 return 0; 6125 } 6126 6127 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6128 DeclarationName TargetName = TargetNameInfo.getName(); 6129 if (!TargetName) 6130 return 0; 6131 6132 // Warn about using declarations. 6133 // TODO: store that the declaration was written without 'using' and 6134 // talk about access decls instead of using decls in the 6135 // diagnostics. 6136 if (!HasUsingKeyword) { 6137 UsingLoc = Name.getSourceRange().getBegin(); 6138 6139 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6140 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6141 } 6142 6143 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6144 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6145 return 0; 6146 6147 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6148 TargetNameInfo, AttrList, 6149 /* IsInstantiation */ false, 6150 IsTypeName, TypenameLoc); 6151 if (UD) 6152 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6153 6154 return UD; 6155} 6156 6157/// \brief Determine whether a using declaration considers the given 6158/// declarations as "equivalent", e.g., if they are redeclarations of 6159/// the same entity or are both typedefs of the same type. 6160static bool 6161IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6162 bool &SuppressRedeclaration) { 6163 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6164 SuppressRedeclaration = false; 6165 return true; 6166 } 6167 6168 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6169 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6170 SuppressRedeclaration = true; 6171 return Context.hasSameType(TD1->getUnderlyingType(), 6172 TD2->getUnderlyingType()); 6173 } 6174 6175 return false; 6176} 6177 6178 6179/// Determines whether to create a using shadow decl for a particular 6180/// decl, given the set of decls existing prior to this using lookup. 6181bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6182 const LookupResult &Previous) { 6183 // Diagnose finding a decl which is not from a base class of the 6184 // current class. We do this now because there are cases where this 6185 // function will silently decide not to build a shadow decl, which 6186 // will pre-empt further diagnostics. 6187 // 6188 // We don't need to do this in C++0x because we do the check once on 6189 // the qualifier. 6190 // 6191 // FIXME: diagnose the following if we care enough: 6192 // struct A { int foo; }; 6193 // struct B : A { using A::foo; }; 6194 // template <class T> struct C : A {}; 6195 // template <class T> struct D : C<T> { using B::foo; } // <--- 6196 // This is invalid (during instantiation) in C++03 because B::foo 6197 // resolves to the using decl in B, which is not a base class of D<T>. 6198 // We can't diagnose it immediately because C<T> is an unknown 6199 // specialization. The UsingShadowDecl in D<T> then points directly 6200 // to A::foo, which will look well-formed when we instantiate. 6201 // The right solution is to not collapse the shadow-decl chain. 6202 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6203 DeclContext *OrigDC = Orig->getDeclContext(); 6204 6205 // Handle enums and anonymous structs. 6206 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6207 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6208 while (OrigRec->isAnonymousStructOrUnion()) 6209 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6210 6211 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6212 if (OrigDC == CurContext) { 6213 Diag(Using->getLocation(), 6214 diag::err_using_decl_nested_name_specifier_is_current_class) 6215 << Using->getQualifierLoc().getSourceRange(); 6216 Diag(Orig->getLocation(), diag::note_using_decl_target); 6217 return true; 6218 } 6219 6220 Diag(Using->getQualifierLoc().getBeginLoc(), 6221 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6222 << Using->getQualifier() 6223 << cast<CXXRecordDecl>(CurContext) 6224 << Using->getQualifierLoc().getSourceRange(); 6225 Diag(Orig->getLocation(), diag::note_using_decl_target); 6226 return true; 6227 } 6228 } 6229 6230 if (Previous.empty()) return false; 6231 6232 NamedDecl *Target = Orig; 6233 if (isa<UsingShadowDecl>(Target)) 6234 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6235 6236 // If the target happens to be one of the previous declarations, we 6237 // don't have a conflict. 6238 // 6239 // FIXME: but we might be increasing its access, in which case we 6240 // should redeclare it. 6241 NamedDecl *NonTag = 0, *Tag = 0; 6242 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6243 I != E; ++I) { 6244 NamedDecl *D = (*I)->getUnderlyingDecl(); 6245 bool Result; 6246 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6247 return Result; 6248 6249 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6250 } 6251 6252 if (Target->isFunctionOrFunctionTemplate()) { 6253 FunctionDecl *FD; 6254 if (isa<FunctionTemplateDecl>(Target)) 6255 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6256 else 6257 FD = cast<FunctionDecl>(Target); 6258 6259 NamedDecl *OldDecl = 0; 6260 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6261 case Ovl_Overload: 6262 return false; 6263 6264 case Ovl_NonFunction: 6265 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6266 break; 6267 6268 // We found a decl with the exact signature. 6269 case Ovl_Match: 6270 // If we're in a record, we want to hide the target, so we 6271 // return true (without a diagnostic) to tell the caller not to 6272 // build a shadow decl. 6273 if (CurContext->isRecord()) 6274 return true; 6275 6276 // If we're not in a record, this is an error. 6277 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6278 break; 6279 } 6280 6281 Diag(Target->getLocation(), diag::note_using_decl_target); 6282 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6283 return true; 6284 } 6285 6286 // Target is not a function. 6287 6288 if (isa<TagDecl>(Target)) { 6289 // No conflict between a tag and a non-tag. 6290 if (!Tag) return false; 6291 6292 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6293 Diag(Target->getLocation(), diag::note_using_decl_target); 6294 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6295 return true; 6296 } 6297 6298 // No conflict between a tag and a non-tag. 6299 if (!NonTag) return false; 6300 6301 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6302 Diag(Target->getLocation(), diag::note_using_decl_target); 6303 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6304 return true; 6305} 6306 6307/// Builds a shadow declaration corresponding to a 'using' declaration. 6308UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6309 UsingDecl *UD, 6310 NamedDecl *Orig) { 6311 6312 // If we resolved to another shadow declaration, just coalesce them. 6313 NamedDecl *Target = Orig; 6314 if (isa<UsingShadowDecl>(Target)) { 6315 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6316 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6317 } 6318 6319 UsingShadowDecl *Shadow 6320 = UsingShadowDecl::Create(Context, CurContext, 6321 UD->getLocation(), UD, Target); 6322 UD->addShadowDecl(Shadow); 6323 6324 Shadow->setAccess(UD->getAccess()); 6325 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6326 Shadow->setInvalidDecl(); 6327 6328 if (S) 6329 PushOnScopeChains(Shadow, S); 6330 else 6331 CurContext->addDecl(Shadow); 6332 6333 6334 return Shadow; 6335} 6336 6337/// Hides a using shadow declaration. This is required by the current 6338/// using-decl implementation when a resolvable using declaration in a 6339/// class is followed by a declaration which would hide or override 6340/// one or more of the using decl's targets; for example: 6341/// 6342/// struct Base { void foo(int); }; 6343/// struct Derived : Base { 6344/// using Base::foo; 6345/// void foo(int); 6346/// }; 6347/// 6348/// The governing language is C++03 [namespace.udecl]p12: 6349/// 6350/// When a using-declaration brings names from a base class into a 6351/// derived class scope, member functions in the derived class 6352/// override and/or hide member functions with the same name and 6353/// parameter types in a base class (rather than conflicting). 6354/// 6355/// There are two ways to implement this: 6356/// (1) optimistically create shadow decls when they're not hidden 6357/// by existing declarations, or 6358/// (2) don't create any shadow decls (or at least don't make them 6359/// visible) until we've fully parsed/instantiated the class. 6360/// The problem with (1) is that we might have to retroactively remove 6361/// a shadow decl, which requires several O(n) operations because the 6362/// decl structures are (very reasonably) not designed for removal. 6363/// (2) avoids this but is very fiddly and phase-dependent. 6364void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6365 if (Shadow->getDeclName().getNameKind() == 6366 DeclarationName::CXXConversionFunctionName) 6367 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6368 6369 // Remove it from the DeclContext... 6370 Shadow->getDeclContext()->removeDecl(Shadow); 6371 6372 // ...and the scope, if applicable... 6373 if (S) { 6374 S->RemoveDecl(Shadow); 6375 IdResolver.RemoveDecl(Shadow); 6376 } 6377 6378 // ...and the using decl. 6379 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6380 6381 // TODO: complain somehow if Shadow was used. It shouldn't 6382 // be possible for this to happen, because...? 6383} 6384 6385/// Builds a using declaration. 6386/// 6387/// \param IsInstantiation - Whether this call arises from an 6388/// instantiation of an unresolved using declaration. We treat 6389/// the lookup differently for these declarations. 6390NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6391 SourceLocation UsingLoc, 6392 CXXScopeSpec &SS, 6393 const DeclarationNameInfo &NameInfo, 6394 AttributeList *AttrList, 6395 bool IsInstantiation, 6396 bool IsTypeName, 6397 SourceLocation TypenameLoc) { 6398 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6399 SourceLocation IdentLoc = NameInfo.getLoc(); 6400 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6401 6402 // FIXME: We ignore attributes for now. 6403 6404 if (SS.isEmpty()) { 6405 Diag(IdentLoc, diag::err_using_requires_qualname); 6406 return 0; 6407 } 6408 6409 // Do the redeclaration lookup in the current scope. 6410 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6411 ForRedeclaration); 6412 Previous.setHideTags(false); 6413 if (S) { 6414 LookupName(Previous, S); 6415 6416 // It is really dumb that we have to do this. 6417 LookupResult::Filter F = Previous.makeFilter(); 6418 while (F.hasNext()) { 6419 NamedDecl *D = F.next(); 6420 if (!isDeclInScope(D, CurContext, S)) 6421 F.erase(); 6422 } 6423 F.done(); 6424 } else { 6425 assert(IsInstantiation && "no scope in non-instantiation"); 6426 assert(CurContext->isRecord() && "scope not record in instantiation"); 6427 LookupQualifiedName(Previous, CurContext); 6428 } 6429 6430 // Check for invalid redeclarations. 6431 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6432 return 0; 6433 6434 // Check for bad qualifiers. 6435 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6436 return 0; 6437 6438 DeclContext *LookupContext = computeDeclContext(SS); 6439 NamedDecl *D; 6440 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6441 if (!LookupContext) { 6442 if (IsTypeName) { 6443 // FIXME: not all declaration name kinds are legal here 6444 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6445 UsingLoc, TypenameLoc, 6446 QualifierLoc, 6447 IdentLoc, NameInfo.getName()); 6448 } else { 6449 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6450 QualifierLoc, NameInfo); 6451 } 6452 } else { 6453 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6454 NameInfo, IsTypeName); 6455 } 6456 D->setAccess(AS); 6457 CurContext->addDecl(D); 6458 6459 if (!LookupContext) return D; 6460 UsingDecl *UD = cast<UsingDecl>(D); 6461 6462 if (RequireCompleteDeclContext(SS, LookupContext)) { 6463 UD->setInvalidDecl(); 6464 return UD; 6465 } 6466 6467 // Constructor inheriting using decls get special treatment. 6468 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6469 if (CheckInheritedConstructorUsingDecl(UD)) 6470 UD->setInvalidDecl(); 6471 return UD; 6472 } 6473 6474 // Otherwise, look up the target name. 6475 6476 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6477 6478 // Unlike most lookups, we don't always want to hide tag 6479 // declarations: tag names are visible through the using declaration 6480 // even if hidden by ordinary names, *except* in a dependent context 6481 // where it's important for the sanity of two-phase lookup. 6482 if (!IsInstantiation) 6483 R.setHideTags(false); 6484 6485 LookupQualifiedName(R, LookupContext); 6486 6487 if (R.empty()) { 6488 Diag(IdentLoc, diag::err_no_member) 6489 << NameInfo.getName() << LookupContext << SS.getRange(); 6490 UD->setInvalidDecl(); 6491 return UD; 6492 } 6493 6494 if (R.isAmbiguous()) { 6495 UD->setInvalidDecl(); 6496 return UD; 6497 } 6498 6499 if (IsTypeName) { 6500 // If we asked for a typename and got a non-type decl, error out. 6501 if (!R.getAsSingle<TypeDecl>()) { 6502 Diag(IdentLoc, diag::err_using_typename_non_type); 6503 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6504 Diag((*I)->getUnderlyingDecl()->getLocation(), 6505 diag::note_using_decl_target); 6506 UD->setInvalidDecl(); 6507 return UD; 6508 } 6509 } else { 6510 // If we asked for a non-typename and we got a type, error out, 6511 // but only if this is an instantiation of an unresolved using 6512 // decl. Otherwise just silently find the type name. 6513 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6514 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6515 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6516 UD->setInvalidDecl(); 6517 return UD; 6518 } 6519 } 6520 6521 // C++0x N2914 [namespace.udecl]p6: 6522 // A using-declaration shall not name a namespace. 6523 if (R.getAsSingle<NamespaceDecl>()) { 6524 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6525 << SS.getRange(); 6526 UD->setInvalidDecl(); 6527 return UD; 6528 } 6529 6530 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6531 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6532 BuildUsingShadowDecl(S, UD, *I); 6533 } 6534 6535 return UD; 6536} 6537 6538/// Additional checks for a using declaration referring to a constructor name. 6539bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6540 if (UD->isTypeName()) { 6541 // FIXME: Cannot specify typename when specifying constructor 6542 return true; 6543 } 6544 6545 const Type *SourceType = UD->getQualifier()->getAsType(); 6546 assert(SourceType && 6547 "Using decl naming constructor doesn't have type in scope spec."); 6548 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6549 6550 // Check whether the named type is a direct base class. 6551 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6552 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6553 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6554 BaseIt != BaseE; ++BaseIt) { 6555 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6556 if (CanonicalSourceType == BaseType) 6557 break; 6558 } 6559 6560 if (BaseIt == BaseE) { 6561 // Did not find SourceType in the bases. 6562 Diag(UD->getUsingLocation(), 6563 diag::err_using_decl_constructor_not_in_direct_base) 6564 << UD->getNameInfo().getSourceRange() 6565 << QualType(SourceType, 0) << TargetClass; 6566 return true; 6567 } 6568 6569 BaseIt->setInheritConstructors(); 6570 6571 return false; 6572} 6573 6574/// Checks that the given using declaration is not an invalid 6575/// redeclaration. Note that this is checking only for the using decl 6576/// itself, not for any ill-formedness among the UsingShadowDecls. 6577bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6578 bool isTypeName, 6579 const CXXScopeSpec &SS, 6580 SourceLocation NameLoc, 6581 const LookupResult &Prev) { 6582 // C++03 [namespace.udecl]p8: 6583 // C++0x [namespace.udecl]p10: 6584 // A using-declaration is a declaration and can therefore be used 6585 // repeatedly where (and only where) multiple declarations are 6586 // allowed. 6587 // 6588 // That's in non-member contexts. 6589 if (!CurContext->getRedeclContext()->isRecord()) 6590 return false; 6591 6592 NestedNameSpecifier *Qual 6593 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6594 6595 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6596 NamedDecl *D = *I; 6597 6598 bool DTypename; 6599 NestedNameSpecifier *DQual; 6600 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6601 DTypename = UD->isTypeName(); 6602 DQual = UD->getQualifier(); 6603 } else if (UnresolvedUsingValueDecl *UD 6604 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6605 DTypename = false; 6606 DQual = UD->getQualifier(); 6607 } else if (UnresolvedUsingTypenameDecl *UD 6608 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6609 DTypename = true; 6610 DQual = UD->getQualifier(); 6611 } else continue; 6612 6613 // using decls differ if one says 'typename' and the other doesn't. 6614 // FIXME: non-dependent using decls? 6615 if (isTypeName != DTypename) continue; 6616 6617 // using decls differ if they name different scopes (but note that 6618 // template instantiation can cause this check to trigger when it 6619 // didn't before instantiation). 6620 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6621 Context.getCanonicalNestedNameSpecifier(DQual)) 6622 continue; 6623 6624 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6625 Diag(D->getLocation(), diag::note_using_decl) << 1; 6626 return true; 6627 } 6628 6629 return false; 6630} 6631 6632 6633/// Checks that the given nested-name qualifier used in a using decl 6634/// in the current context is appropriately related to the current 6635/// scope. If an error is found, diagnoses it and returns true. 6636bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6637 const CXXScopeSpec &SS, 6638 SourceLocation NameLoc) { 6639 DeclContext *NamedContext = computeDeclContext(SS); 6640 6641 if (!CurContext->isRecord()) { 6642 // C++03 [namespace.udecl]p3: 6643 // C++0x [namespace.udecl]p8: 6644 // A using-declaration for a class member shall be a member-declaration. 6645 6646 // If we weren't able to compute a valid scope, it must be a 6647 // dependent class scope. 6648 if (!NamedContext || NamedContext->isRecord()) { 6649 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6650 << SS.getRange(); 6651 return true; 6652 } 6653 6654 // Otherwise, everything is known to be fine. 6655 return false; 6656 } 6657 6658 // The current scope is a record. 6659 6660 // If the named context is dependent, we can't decide much. 6661 if (!NamedContext) { 6662 // FIXME: in C++0x, we can diagnose if we can prove that the 6663 // nested-name-specifier does not refer to a base class, which is 6664 // still possible in some cases. 6665 6666 // Otherwise we have to conservatively report that things might be 6667 // okay. 6668 return false; 6669 } 6670 6671 if (!NamedContext->isRecord()) { 6672 // Ideally this would point at the last name in the specifier, 6673 // but we don't have that level of source info. 6674 Diag(SS.getRange().getBegin(), 6675 diag::err_using_decl_nested_name_specifier_is_not_class) 6676 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6677 return true; 6678 } 6679 6680 if (!NamedContext->isDependentContext() && 6681 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6682 return true; 6683 6684 if (getLangOptions().CPlusPlus0x) { 6685 // C++0x [namespace.udecl]p3: 6686 // In a using-declaration used as a member-declaration, the 6687 // nested-name-specifier shall name a base class of the class 6688 // being defined. 6689 6690 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6691 cast<CXXRecordDecl>(NamedContext))) { 6692 if (CurContext == NamedContext) { 6693 Diag(NameLoc, 6694 diag::err_using_decl_nested_name_specifier_is_current_class) 6695 << SS.getRange(); 6696 return true; 6697 } 6698 6699 Diag(SS.getRange().getBegin(), 6700 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6701 << (NestedNameSpecifier*) SS.getScopeRep() 6702 << cast<CXXRecordDecl>(CurContext) 6703 << SS.getRange(); 6704 return true; 6705 } 6706 6707 return false; 6708 } 6709 6710 // C++03 [namespace.udecl]p4: 6711 // A using-declaration used as a member-declaration shall refer 6712 // to a member of a base class of the class being defined [etc.]. 6713 6714 // Salient point: SS doesn't have to name a base class as long as 6715 // lookup only finds members from base classes. Therefore we can 6716 // diagnose here only if we can prove that that can't happen, 6717 // i.e. if the class hierarchies provably don't intersect. 6718 6719 // TODO: it would be nice if "definitely valid" results were cached 6720 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6721 // need to be repeated. 6722 6723 struct UserData { 6724 llvm::DenseSet<const CXXRecordDecl*> Bases; 6725 6726 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6727 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6728 Data->Bases.insert(Base); 6729 return true; 6730 } 6731 6732 bool hasDependentBases(const CXXRecordDecl *Class) { 6733 return !Class->forallBases(collect, this); 6734 } 6735 6736 /// Returns true if the base is dependent or is one of the 6737 /// accumulated base classes. 6738 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6739 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6740 return !Data->Bases.count(Base); 6741 } 6742 6743 bool mightShareBases(const CXXRecordDecl *Class) { 6744 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6745 } 6746 }; 6747 6748 UserData Data; 6749 6750 // Returns false if we find a dependent base. 6751 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6752 return false; 6753 6754 // Returns false if the class has a dependent base or if it or one 6755 // of its bases is present in the base set of the current context. 6756 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6757 return false; 6758 6759 Diag(SS.getRange().getBegin(), 6760 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6761 << (NestedNameSpecifier*) SS.getScopeRep() 6762 << cast<CXXRecordDecl>(CurContext) 6763 << SS.getRange(); 6764 6765 return true; 6766} 6767 6768Decl *Sema::ActOnAliasDeclaration(Scope *S, 6769 AccessSpecifier AS, 6770 MultiTemplateParamsArg TemplateParamLists, 6771 SourceLocation UsingLoc, 6772 UnqualifiedId &Name, 6773 TypeResult Type) { 6774 // Skip up to the relevant declaration scope. 6775 while (S->getFlags() & Scope::TemplateParamScope) 6776 S = S->getParent(); 6777 assert((S->getFlags() & Scope::DeclScope) && 6778 "got alias-declaration outside of declaration scope"); 6779 6780 if (Type.isInvalid()) 6781 return 0; 6782 6783 bool Invalid = false; 6784 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6785 TypeSourceInfo *TInfo = 0; 6786 GetTypeFromParser(Type.get(), &TInfo); 6787 6788 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6789 return 0; 6790 6791 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6792 UPPC_DeclarationType)) { 6793 Invalid = true; 6794 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6795 TInfo->getTypeLoc().getBeginLoc()); 6796 } 6797 6798 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6799 LookupName(Previous, S); 6800 6801 // Warn about shadowing the name of a template parameter. 6802 if (Previous.isSingleResult() && 6803 Previous.getFoundDecl()->isTemplateParameter()) { 6804 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6805 Previous.clear(); 6806 } 6807 6808 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6809 "name in alias declaration must be an identifier"); 6810 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6811 Name.StartLocation, 6812 Name.Identifier, TInfo); 6813 6814 NewTD->setAccess(AS); 6815 6816 if (Invalid) 6817 NewTD->setInvalidDecl(); 6818 6819 CheckTypedefForVariablyModifiedType(S, NewTD); 6820 Invalid |= NewTD->isInvalidDecl(); 6821 6822 bool Redeclaration = false; 6823 6824 NamedDecl *NewND; 6825 if (TemplateParamLists.size()) { 6826 TypeAliasTemplateDecl *OldDecl = 0; 6827 TemplateParameterList *OldTemplateParams = 0; 6828 6829 if (TemplateParamLists.size() != 1) { 6830 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6831 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6832 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6833 } 6834 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6835 6836 // Only consider previous declarations in the same scope. 6837 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6838 /*ExplicitInstantiationOrSpecialization*/false); 6839 if (!Previous.empty()) { 6840 Redeclaration = true; 6841 6842 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6843 if (!OldDecl && !Invalid) { 6844 Diag(UsingLoc, diag::err_redefinition_different_kind) 6845 << Name.Identifier; 6846 6847 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6848 if (OldD->getLocation().isValid()) 6849 Diag(OldD->getLocation(), diag::note_previous_definition); 6850 6851 Invalid = true; 6852 } 6853 6854 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6855 if (TemplateParameterListsAreEqual(TemplateParams, 6856 OldDecl->getTemplateParameters(), 6857 /*Complain=*/true, 6858 TPL_TemplateMatch)) 6859 OldTemplateParams = OldDecl->getTemplateParameters(); 6860 else 6861 Invalid = true; 6862 6863 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6864 if (!Invalid && 6865 !Context.hasSameType(OldTD->getUnderlyingType(), 6866 NewTD->getUnderlyingType())) { 6867 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6868 // but we can't reasonably accept it. 6869 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6870 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6871 if (OldTD->getLocation().isValid()) 6872 Diag(OldTD->getLocation(), diag::note_previous_definition); 6873 Invalid = true; 6874 } 6875 } 6876 } 6877 6878 // Merge any previous default template arguments into our parameters, 6879 // and check the parameter list. 6880 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6881 TPC_TypeAliasTemplate)) 6882 return 0; 6883 6884 TypeAliasTemplateDecl *NewDecl = 6885 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6886 Name.Identifier, TemplateParams, 6887 NewTD); 6888 6889 NewDecl->setAccess(AS); 6890 6891 if (Invalid) 6892 NewDecl->setInvalidDecl(); 6893 else if (OldDecl) 6894 NewDecl->setPreviousDeclaration(OldDecl); 6895 6896 NewND = NewDecl; 6897 } else { 6898 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6899 NewND = NewTD; 6900 } 6901 6902 if (!Redeclaration) 6903 PushOnScopeChains(NewND, S); 6904 6905 return NewND; 6906} 6907 6908Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6909 SourceLocation NamespaceLoc, 6910 SourceLocation AliasLoc, 6911 IdentifierInfo *Alias, 6912 CXXScopeSpec &SS, 6913 SourceLocation IdentLoc, 6914 IdentifierInfo *Ident) { 6915 6916 // Lookup the namespace name. 6917 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6918 LookupParsedName(R, S, &SS); 6919 6920 // Check if we have a previous declaration with the same name. 6921 NamedDecl *PrevDecl 6922 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6923 ForRedeclaration); 6924 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6925 PrevDecl = 0; 6926 6927 if (PrevDecl) { 6928 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6929 // We already have an alias with the same name that points to the same 6930 // namespace, so don't create a new one. 6931 // FIXME: At some point, we'll want to create the (redundant) 6932 // declaration to maintain better source information. 6933 if (!R.isAmbiguous() && !R.empty() && 6934 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6935 return 0; 6936 } 6937 6938 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6939 diag::err_redefinition_different_kind; 6940 Diag(AliasLoc, DiagID) << Alias; 6941 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6942 return 0; 6943 } 6944 6945 if (R.isAmbiguous()) 6946 return 0; 6947 6948 if (R.empty()) { 6949 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6950 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6951 return 0; 6952 } 6953 } 6954 6955 NamespaceAliasDecl *AliasDecl = 6956 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6957 Alias, SS.getWithLocInContext(Context), 6958 IdentLoc, R.getFoundDecl()); 6959 6960 PushOnScopeChains(AliasDecl, S); 6961 return AliasDecl; 6962} 6963 6964namespace { 6965 /// \brief Scoped object used to handle the state changes required in Sema 6966 /// to implicitly define the body of a C++ member function; 6967 class ImplicitlyDefinedFunctionScope { 6968 Sema &S; 6969 Sema::ContextRAII SavedContext; 6970 6971 public: 6972 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6973 : S(S), SavedContext(S, Method) 6974 { 6975 S.PushFunctionScope(); 6976 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6977 } 6978 6979 ~ImplicitlyDefinedFunctionScope() { 6980 S.PopExpressionEvaluationContext(); 6981 S.PopFunctionScopeInfo(); 6982 } 6983 }; 6984} 6985 6986Sema::ImplicitExceptionSpecification 6987Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6988 // C++ [except.spec]p14: 6989 // An implicitly declared special member function (Clause 12) shall have an 6990 // exception-specification. [...] 6991 ImplicitExceptionSpecification ExceptSpec(Context); 6992 if (ClassDecl->isInvalidDecl()) 6993 return ExceptSpec; 6994 6995 // Direct base-class constructors. 6996 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6997 BEnd = ClassDecl->bases_end(); 6998 B != BEnd; ++B) { 6999 if (B->isVirtual()) // Handled below. 7000 continue; 7001 7002 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7003 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7004 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7005 // If this is a deleted function, add it anyway. This might be conformant 7006 // with the standard. This might not. I'm not sure. It might not matter. 7007 if (Constructor) 7008 ExceptSpec.CalledDecl(Constructor); 7009 } 7010 } 7011 7012 // Virtual base-class constructors. 7013 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7014 BEnd = ClassDecl->vbases_end(); 7015 B != BEnd; ++B) { 7016 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7017 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7018 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7019 // If this is a deleted function, add it anyway. This might be conformant 7020 // with the standard. This might not. I'm not sure. It might not matter. 7021 if (Constructor) 7022 ExceptSpec.CalledDecl(Constructor); 7023 } 7024 } 7025 7026 // Field constructors. 7027 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7028 FEnd = ClassDecl->field_end(); 7029 F != FEnd; ++F) { 7030 if (F->hasInClassInitializer()) { 7031 if (Expr *E = F->getInClassInitializer()) 7032 ExceptSpec.CalledExpr(E); 7033 else if (!F->isInvalidDecl()) 7034 ExceptSpec.SetDelayed(); 7035 } else if (const RecordType *RecordTy 7036 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7037 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7038 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7039 // If this is a deleted function, add it anyway. This might be conformant 7040 // with the standard. This might not. I'm not sure. It might not matter. 7041 // In particular, the problem is that this function never gets called. It 7042 // might just be ill-formed because this function attempts to refer to 7043 // a deleted function here. 7044 if (Constructor) 7045 ExceptSpec.CalledDecl(Constructor); 7046 } 7047 } 7048 7049 return ExceptSpec; 7050} 7051 7052CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7053 CXXRecordDecl *ClassDecl) { 7054 // C++ [class.ctor]p5: 7055 // A default constructor for a class X is a constructor of class X 7056 // that can be called without an argument. If there is no 7057 // user-declared constructor for class X, a default constructor is 7058 // implicitly declared. An implicitly-declared default constructor 7059 // is an inline public member of its class. 7060 assert(!ClassDecl->hasUserDeclaredConstructor() && 7061 "Should not build implicit default constructor!"); 7062 7063 ImplicitExceptionSpecification Spec = 7064 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7065 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7066 7067 // Create the actual constructor declaration. 7068 CanQualType ClassType 7069 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7070 SourceLocation ClassLoc = ClassDecl->getLocation(); 7071 DeclarationName Name 7072 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7073 DeclarationNameInfo NameInfo(Name, ClassLoc); 7074 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7075 Context, ClassDecl, ClassLoc, NameInfo, 7076 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 7077 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7078 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 7079 getLangOptions().CPlusPlus0x); 7080 DefaultCon->setAccess(AS_public); 7081 DefaultCon->setDefaulted(); 7082 DefaultCon->setImplicit(); 7083 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7084 7085 // Note that we have declared this constructor. 7086 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7087 7088 if (Scope *S = getScopeForContext(ClassDecl)) 7089 PushOnScopeChains(DefaultCon, S, false); 7090 ClassDecl->addDecl(DefaultCon); 7091 7092 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7093 DefaultCon->setDeletedAsWritten(); 7094 7095 return DefaultCon; 7096} 7097 7098void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7099 CXXConstructorDecl *Constructor) { 7100 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7101 !Constructor->doesThisDeclarationHaveABody() && 7102 !Constructor->isDeleted()) && 7103 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7104 7105 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7106 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7107 7108 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7109 DiagnosticErrorTrap Trap(Diags); 7110 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7111 Trap.hasErrorOccurred()) { 7112 Diag(CurrentLocation, diag::note_member_synthesized_at) 7113 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7114 Constructor->setInvalidDecl(); 7115 return; 7116 } 7117 7118 SourceLocation Loc = Constructor->getLocation(); 7119 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7120 7121 Constructor->setUsed(); 7122 MarkVTableUsed(CurrentLocation, ClassDecl); 7123 7124 if (ASTMutationListener *L = getASTMutationListener()) { 7125 L->CompletedImplicitDefinition(Constructor); 7126 } 7127} 7128 7129/// Get any existing defaulted default constructor for the given class. Do not 7130/// implicitly define one if it does not exist. 7131static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7132 CXXRecordDecl *D) { 7133 ASTContext &Context = Self.Context; 7134 QualType ClassType = Context.getTypeDeclType(D); 7135 DeclarationName ConstructorName 7136 = Context.DeclarationNames.getCXXConstructorName( 7137 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7138 7139 DeclContext::lookup_const_iterator Con, ConEnd; 7140 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7141 Con != ConEnd; ++Con) { 7142 // A function template cannot be defaulted. 7143 if (isa<FunctionTemplateDecl>(*Con)) 7144 continue; 7145 7146 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7147 if (Constructor->isDefaultConstructor()) 7148 return Constructor->isDefaulted() ? Constructor : 0; 7149 } 7150 return 0; 7151} 7152 7153void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7154 if (!D) return; 7155 AdjustDeclIfTemplate(D); 7156 7157 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7158 CXXConstructorDecl *CtorDecl 7159 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7160 7161 if (!CtorDecl) return; 7162 7163 // Compute the exception specification for the default constructor. 7164 const FunctionProtoType *CtorTy = 7165 CtorDecl->getType()->castAs<FunctionProtoType>(); 7166 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7167 ImplicitExceptionSpecification Spec = 7168 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7169 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7170 assert(EPI.ExceptionSpecType != EST_Delayed); 7171 7172 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7173 } 7174 7175 // If the default constructor is explicitly defaulted, checking the exception 7176 // specification is deferred until now. 7177 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7178 !ClassDecl->isDependentType()) 7179 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7180} 7181 7182void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7183 // We start with an initial pass over the base classes to collect those that 7184 // inherit constructors from. If there are none, we can forgo all further 7185 // processing. 7186 typedef SmallVector<const RecordType *, 4> BasesVector; 7187 BasesVector BasesToInheritFrom; 7188 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7189 BaseE = ClassDecl->bases_end(); 7190 BaseIt != BaseE; ++BaseIt) { 7191 if (BaseIt->getInheritConstructors()) { 7192 QualType Base = BaseIt->getType(); 7193 if (Base->isDependentType()) { 7194 // If we inherit constructors from anything that is dependent, just 7195 // abort processing altogether. We'll get another chance for the 7196 // instantiations. 7197 return; 7198 } 7199 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7200 } 7201 } 7202 if (BasesToInheritFrom.empty()) 7203 return; 7204 7205 // Now collect the constructors that we already have in the current class. 7206 // Those take precedence over inherited constructors. 7207 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7208 // unless there is a user-declared constructor with the same signature in 7209 // the class where the using-declaration appears. 7210 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7211 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7212 CtorE = ClassDecl->ctor_end(); 7213 CtorIt != CtorE; ++CtorIt) { 7214 ExistingConstructors.insert( 7215 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7216 } 7217 7218 Scope *S = getScopeForContext(ClassDecl); 7219 DeclarationName CreatedCtorName = 7220 Context.DeclarationNames.getCXXConstructorName( 7221 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7222 7223 // Now comes the true work. 7224 // First, we keep a map from constructor types to the base that introduced 7225 // them. Needed for finding conflicting constructors. We also keep the 7226 // actually inserted declarations in there, for pretty diagnostics. 7227 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7228 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7229 ConstructorToSourceMap InheritedConstructors; 7230 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7231 BaseE = BasesToInheritFrom.end(); 7232 BaseIt != BaseE; ++BaseIt) { 7233 const RecordType *Base = *BaseIt; 7234 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7235 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7236 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7237 CtorE = BaseDecl->ctor_end(); 7238 CtorIt != CtorE; ++CtorIt) { 7239 // Find the using declaration for inheriting this base's constructors. 7240 DeclarationName Name = 7241 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7242 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7243 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7244 SourceLocation UsingLoc = UD ? UD->getLocation() : 7245 ClassDecl->getLocation(); 7246 7247 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7248 // from the class X named in the using-declaration consists of actual 7249 // constructors and notional constructors that result from the 7250 // transformation of defaulted parameters as follows: 7251 // - all non-template default constructors of X, and 7252 // - for each non-template constructor of X that has at least one 7253 // parameter with a default argument, the set of constructors that 7254 // results from omitting any ellipsis parameter specification and 7255 // successively omitting parameters with a default argument from the 7256 // end of the parameter-type-list. 7257 CXXConstructorDecl *BaseCtor = *CtorIt; 7258 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7259 const FunctionProtoType *BaseCtorType = 7260 BaseCtor->getType()->getAs<FunctionProtoType>(); 7261 7262 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7263 maxParams = BaseCtor->getNumParams(); 7264 params <= maxParams; ++params) { 7265 // Skip default constructors. They're never inherited. 7266 if (params == 0) 7267 continue; 7268 // Skip copy and move constructors for the same reason. 7269 if (CanBeCopyOrMove && params == 1) 7270 continue; 7271 7272 // Build up a function type for this particular constructor. 7273 // FIXME: The working paper does not consider that the exception spec 7274 // for the inheriting constructor might be larger than that of the 7275 // source. This code doesn't yet, either. When it does, this code will 7276 // need to be delayed until after exception specifications and in-class 7277 // member initializers are attached. 7278 const Type *NewCtorType; 7279 if (params == maxParams) 7280 NewCtorType = BaseCtorType; 7281 else { 7282 SmallVector<QualType, 16> Args; 7283 for (unsigned i = 0; i < params; ++i) { 7284 Args.push_back(BaseCtorType->getArgType(i)); 7285 } 7286 FunctionProtoType::ExtProtoInfo ExtInfo = 7287 BaseCtorType->getExtProtoInfo(); 7288 ExtInfo.Variadic = false; 7289 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7290 Args.data(), params, ExtInfo) 7291 .getTypePtr(); 7292 } 7293 const Type *CanonicalNewCtorType = 7294 Context.getCanonicalType(NewCtorType); 7295 7296 // Now that we have the type, first check if the class already has a 7297 // constructor with this signature. 7298 if (ExistingConstructors.count(CanonicalNewCtorType)) 7299 continue; 7300 7301 // Then we check if we have already declared an inherited constructor 7302 // with this signature. 7303 std::pair<ConstructorToSourceMap::iterator, bool> result = 7304 InheritedConstructors.insert(std::make_pair( 7305 CanonicalNewCtorType, 7306 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7307 if (!result.second) { 7308 // Already in the map. If it came from a different class, that's an 7309 // error. Not if it's from the same. 7310 CanQualType PreviousBase = result.first->second.first; 7311 if (CanonicalBase != PreviousBase) { 7312 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7313 const CXXConstructorDecl *PrevBaseCtor = 7314 PrevCtor->getInheritedConstructor(); 7315 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7316 7317 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7318 Diag(BaseCtor->getLocation(), 7319 diag::note_using_decl_constructor_conflict_current_ctor); 7320 Diag(PrevBaseCtor->getLocation(), 7321 diag::note_using_decl_constructor_conflict_previous_ctor); 7322 Diag(PrevCtor->getLocation(), 7323 diag::note_using_decl_constructor_conflict_previous_using); 7324 } 7325 continue; 7326 } 7327 7328 // OK, we're there, now add the constructor. 7329 // C++0x [class.inhctor]p8: [...] that would be performed by a 7330 // user-written inline constructor [...] 7331 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7332 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7333 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7334 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7335 /*ImplicitlyDeclared=*/true, 7336 // FIXME: Due to a defect in the standard, we treat inherited 7337 // constructors as constexpr even if that makes them ill-formed. 7338 /*Constexpr=*/BaseCtor->isConstexpr()); 7339 NewCtor->setAccess(BaseCtor->getAccess()); 7340 7341 // Build up the parameter decls and add them. 7342 SmallVector<ParmVarDecl *, 16> ParamDecls; 7343 for (unsigned i = 0; i < params; ++i) { 7344 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7345 UsingLoc, UsingLoc, 7346 /*IdentifierInfo=*/0, 7347 BaseCtorType->getArgType(i), 7348 /*TInfo=*/0, SC_None, 7349 SC_None, /*DefaultArg=*/0)); 7350 } 7351 NewCtor->setParams(ParamDecls); 7352 NewCtor->setInheritedConstructor(BaseCtor); 7353 7354 PushOnScopeChains(NewCtor, S, false); 7355 ClassDecl->addDecl(NewCtor); 7356 result.first->second.second = NewCtor; 7357 } 7358 } 7359 } 7360} 7361 7362Sema::ImplicitExceptionSpecification 7363Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7364 // C++ [except.spec]p14: 7365 // An implicitly declared special member function (Clause 12) shall have 7366 // an exception-specification. 7367 ImplicitExceptionSpecification ExceptSpec(Context); 7368 if (ClassDecl->isInvalidDecl()) 7369 return ExceptSpec; 7370 7371 // Direct base-class destructors. 7372 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7373 BEnd = ClassDecl->bases_end(); 7374 B != BEnd; ++B) { 7375 if (B->isVirtual()) // Handled below. 7376 continue; 7377 7378 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7379 ExceptSpec.CalledDecl( 7380 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7381 } 7382 7383 // Virtual base-class destructors. 7384 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7385 BEnd = ClassDecl->vbases_end(); 7386 B != BEnd; ++B) { 7387 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7388 ExceptSpec.CalledDecl( 7389 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7390 } 7391 7392 // Field destructors. 7393 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7394 FEnd = ClassDecl->field_end(); 7395 F != FEnd; ++F) { 7396 if (const RecordType *RecordTy 7397 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7398 ExceptSpec.CalledDecl( 7399 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7400 } 7401 7402 return ExceptSpec; 7403} 7404 7405CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7406 // C++ [class.dtor]p2: 7407 // If a class has no user-declared destructor, a destructor is 7408 // declared implicitly. An implicitly-declared destructor is an 7409 // inline public member of its class. 7410 7411 ImplicitExceptionSpecification Spec = 7412 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7413 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7414 7415 // Create the actual destructor declaration. 7416 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7417 7418 CanQualType ClassType 7419 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7420 SourceLocation ClassLoc = ClassDecl->getLocation(); 7421 DeclarationName Name 7422 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7423 DeclarationNameInfo NameInfo(Name, ClassLoc); 7424 CXXDestructorDecl *Destructor 7425 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7426 /*isInline=*/true, 7427 /*isImplicitlyDeclared=*/true); 7428 Destructor->setAccess(AS_public); 7429 Destructor->setDefaulted(); 7430 Destructor->setImplicit(); 7431 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7432 7433 // Note that we have declared this destructor. 7434 ++ASTContext::NumImplicitDestructorsDeclared; 7435 7436 // Introduce this destructor into its scope. 7437 if (Scope *S = getScopeForContext(ClassDecl)) 7438 PushOnScopeChains(Destructor, S, false); 7439 ClassDecl->addDecl(Destructor); 7440 7441 // This could be uniqued if it ever proves significant. 7442 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7443 7444 if (ShouldDeleteDestructor(Destructor)) 7445 Destructor->setDeletedAsWritten(); 7446 7447 AddOverriddenMethods(ClassDecl, Destructor); 7448 7449 return Destructor; 7450} 7451 7452void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7453 CXXDestructorDecl *Destructor) { 7454 assert((Destructor->isDefaulted() && 7455 !Destructor->doesThisDeclarationHaveABody()) && 7456 "DefineImplicitDestructor - call it for implicit default dtor"); 7457 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7458 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7459 7460 if (Destructor->isInvalidDecl()) 7461 return; 7462 7463 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7464 7465 DiagnosticErrorTrap Trap(Diags); 7466 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7467 Destructor->getParent()); 7468 7469 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7470 Diag(CurrentLocation, diag::note_member_synthesized_at) 7471 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7472 7473 Destructor->setInvalidDecl(); 7474 return; 7475 } 7476 7477 SourceLocation Loc = Destructor->getLocation(); 7478 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7479 Destructor->setImplicitlyDefined(true); 7480 Destructor->setUsed(); 7481 MarkVTableUsed(CurrentLocation, ClassDecl); 7482 7483 if (ASTMutationListener *L = getASTMutationListener()) { 7484 L->CompletedImplicitDefinition(Destructor); 7485 } 7486} 7487 7488void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7489 CXXDestructorDecl *destructor) { 7490 // C++11 [class.dtor]p3: 7491 // A declaration of a destructor that does not have an exception- 7492 // specification is implicitly considered to have the same exception- 7493 // specification as an implicit declaration. 7494 const FunctionProtoType *dtorType = destructor->getType()-> 7495 getAs<FunctionProtoType>(); 7496 if (dtorType->hasExceptionSpec()) 7497 return; 7498 7499 ImplicitExceptionSpecification exceptSpec = 7500 ComputeDefaultedDtorExceptionSpec(classDecl); 7501 7502 // Replace the destructor's type, building off the existing one. Fortunately, 7503 // the only thing of interest in the destructor type is its extended info. 7504 // The return and arguments are fixed. 7505 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7506 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7507 epi.NumExceptions = exceptSpec.size(); 7508 epi.Exceptions = exceptSpec.data(); 7509 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7510 7511 destructor->setType(ty); 7512 7513 // FIXME: If the destructor has a body that could throw, and the newly created 7514 // spec doesn't allow exceptions, we should emit a warning, because this 7515 // change in behavior can break conforming C++03 programs at runtime. 7516 // However, we don't have a body yet, so it needs to be done somewhere else. 7517} 7518 7519/// \brief Builds a statement that copies/moves the given entity from \p From to 7520/// \c To. 7521/// 7522/// This routine is used to copy/move the members of a class with an 7523/// implicitly-declared copy/move assignment operator. When the entities being 7524/// copied are arrays, this routine builds for loops to copy them. 7525/// 7526/// \param S The Sema object used for type-checking. 7527/// 7528/// \param Loc The location where the implicit copy/move is being generated. 7529/// 7530/// \param T The type of the expressions being copied/moved. Both expressions 7531/// must have this type. 7532/// 7533/// \param To The expression we are copying/moving to. 7534/// 7535/// \param From The expression we are copying/moving from. 7536/// 7537/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7538/// Otherwise, it's a non-static member subobject. 7539/// 7540/// \param Copying Whether we're copying or moving. 7541/// 7542/// \param Depth Internal parameter recording the depth of the recursion. 7543/// 7544/// \returns A statement or a loop that copies the expressions. 7545static StmtResult 7546BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7547 Expr *To, Expr *From, 7548 bool CopyingBaseSubobject, bool Copying, 7549 unsigned Depth = 0) { 7550 // C++0x [class.copy]p28: 7551 // Each subobject is assigned in the manner appropriate to its type: 7552 // 7553 // - if the subobject is of class type, as if by a call to operator= with 7554 // the subobject as the object expression and the corresponding 7555 // subobject of x as a single function argument (as if by explicit 7556 // qualification; that is, ignoring any possible virtual overriding 7557 // functions in more derived classes); 7558 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7559 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7560 7561 // Look for operator=. 7562 DeclarationName Name 7563 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7564 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7565 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7566 7567 // Filter out any result that isn't a copy/move-assignment operator. 7568 LookupResult::Filter F = OpLookup.makeFilter(); 7569 while (F.hasNext()) { 7570 NamedDecl *D = F.next(); 7571 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7572 if (Copying ? Method->isCopyAssignmentOperator() : 7573 Method->isMoveAssignmentOperator()) 7574 continue; 7575 7576 F.erase(); 7577 } 7578 F.done(); 7579 7580 // Suppress the protected check (C++ [class.protected]) for each of the 7581 // assignment operators we found. This strange dance is required when 7582 // we're assigning via a base classes's copy-assignment operator. To 7583 // ensure that we're getting the right base class subobject (without 7584 // ambiguities), we need to cast "this" to that subobject type; to 7585 // ensure that we don't go through the virtual call mechanism, we need 7586 // to qualify the operator= name with the base class (see below). However, 7587 // this means that if the base class has a protected copy assignment 7588 // operator, the protected member access check will fail. So, we 7589 // rewrite "protected" access to "public" access in this case, since we 7590 // know by construction that we're calling from a derived class. 7591 if (CopyingBaseSubobject) { 7592 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7593 L != LEnd; ++L) { 7594 if (L.getAccess() == AS_protected) 7595 L.setAccess(AS_public); 7596 } 7597 } 7598 7599 // Create the nested-name-specifier that will be used to qualify the 7600 // reference to operator=; this is required to suppress the virtual 7601 // call mechanism. 7602 CXXScopeSpec SS; 7603 SS.MakeTrivial(S.Context, 7604 NestedNameSpecifier::Create(S.Context, 0, false, 7605 T.getTypePtr()), 7606 Loc); 7607 7608 // Create the reference to operator=. 7609 ExprResult OpEqualRef 7610 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7611 /*TemplateKWLoc=*/SourceLocation(), 7612 /*FirstQualifierInScope=*/0, 7613 OpLookup, 7614 /*TemplateArgs=*/0, 7615 /*SuppressQualifierCheck=*/true); 7616 if (OpEqualRef.isInvalid()) 7617 return StmtError(); 7618 7619 // Build the call to the assignment operator. 7620 7621 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7622 OpEqualRef.takeAs<Expr>(), 7623 Loc, &From, 1, Loc); 7624 if (Call.isInvalid()) 7625 return StmtError(); 7626 7627 return S.Owned(Call.takeAs<Stmt>()); 7628 } 7629 7630 // - if the subobject is of scalar type, the built-in assignment 7631 // operator is used. 7632 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7633 if (!ArrayTy) { 7634 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7635 if (Assignment.isInvalid()) 7636 return StmtError(); 7637 7638 return S.Owned(Assignment.takeAs<Stmt>()); 7639 } 7640 7641 // - if the subobject is an array, each element is assigned, in the 7642 // manner appropriate to the element type; 7643 7644 // Construct a loop over the array bounds, e.g., 7645 // 7646 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7647 // 7648 // that will copy each of the array elements. 7649 QualType SizeType = S.Context.getSizeType(); 7650 7651 // Create the iteration variable. 7652 IdentifierInfo *IterationVarName = 0; 7653 { 7654 llvm::SmallString<8> Str; 7655 llvm::raw_svector_ostream OS(Str); 7656 OS << "__i" << Depth; 7657 IterationVarName = &S.Context.Idents.get(OS.str()); 7658 } 7659 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7660 IterationVarName, SizeType, 7661 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7662 SC_None, SC_None); 7663 7664 // Initialize the iteration variable to zero. 7665 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7666 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7667 7668 // Create a reference to the iteration variable; we'll use this several 7669 // times throughout. 7670 Expr *IterationVarRef 7671 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7672 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7673 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7674 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7675 7676 // Create the DeclStmt that holds the iteration variable. 7677 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7678 7679 // Create the comparison against the array bound. 7680 llvm::APInt Upper 7681 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7682 Expr *Comparison 7683 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7684 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7685 BO_NE, S.Context.BoolTy, 7686 VK_RValue, OK_Ordinary, Loc); 7687 7688 // Create the pre-increment of the iteration variable. 7689 Expr *Increment 7690 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7691 VK_LValue, OK_Ordinary, Loc); 7692 7693 // Subscript the "from" and "to" expressions with the iteration variable. 7694 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7695 IterationVarRefRVal, 7696 Loc)); 7697 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7698 IterationVarRefRVal, 7699 Loc)); 7700 if (!Copying) // Cast to rvalue 7701 From = CastForMoving(S, From); 7702 7703 // Build the copy/move for an individual element of the array. 7704 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7705 To, From, CopyingBaseSubobject, 7706 Copying, Depth + 1); 7707 if (Copy.isInvalid()) 7708 return StmtError(); 7709 7710 // Construct the loop that copies all elements of this array. 7711 return S.ActOnForStmt(Loc, Loc, InitStmt, 7712 S.MakeFullExpr(Comparison), 7713 0, S.MakeFullExpr(Increment), 7714 Loc, Copy.take()); 7715} 7716 7717std::pair<Sema::ImplicitExceptionSpecification, bool> 7718Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7719 CXXRecordDecl *ClassDecl) { 7720 if (ClassDecl->isInvalidDecl()) 7721 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7722 7723 // C++ [class.copy]p10: 7724 // If the class definition does not explicitly declare a copy 7725 // assignment operator, one is declared implicitly. 7726 // The implicitly-defined copy assignment operator for a class X 7727 // will have the form 7728 // 7729 // X& X::operator=(const X&) 7730 // 7731 // if 7732 bool HasConstCopyAssignment = true; 7733 7734 // -- each direct base class B of X has a copy assignment operator 7735 // whose parameter is of type const B&, const volatile B& or B, 7736 // and 7737 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7738 BaseEnd = ClassDecl->bases_end(); 7739 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7740 // We'll handle this below 7741 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7742 continue; 7743 7744 assert(!Base->getType()->isDependentType() && 7745 "Cannot generate implicit members for class with dependent bases."); 7746 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7747 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7748 &HasConstCopyAssignment); 7749 } 7750 7751 // In C++11, the above citation has "or virtual" added 7752 if (LangOpts.CPlusPlus0x) { 7753 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7754 BaseEnd = ClassDecl->vbases_end(); 7755 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7756 assert(!Base->getType()->isDependentType() && 7757 "Cannot generate implicit members for class with dependent bases."); 7758 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7759 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7760 &HasConstCopyAssignment); 7761 } 7762 } 7763 7764 // -- for all the nonstatic data members of X that are of a class 7765 // type M (or array thereof), each such class type has a copy 7766 // assignment operator whose parameter is of type const M&, 7767 // const volatile M& or M. 7768 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7769 FieldEnd = ClassDecl->field_end(); 7770 HasConstCopyAssignment && Field != FieldEnd; 7771 ++Field) { 7772 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7773 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7774 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7775 &HasConstCopyAssignment); 7776 } 7777 } 7778 7779 // Otherwise, the implicitly declared copy assignment operator will 7780 // have the form 7781 // 7782 // X& X::operator=(X&) 7783 7784 // C++ [except.spec]p14: 7785 // An implicitly declared special member function (Clause 12) shall have an 7786 // exception-specification. [...] 7787 7788 // It is unspecified whether or not an implicit copy assignment operator 7789 // attempts to deduplicate calls to assignment operators of virtual bases are 7790 // made. As such, this exception specification is effectively unspecified. 7791 // Based on a similar decision made for constness in C++0x, we're erring on 7792 // the side of assuming such calls to be made regardless of whether they 7793 // actually happen. 7794 ImplicitExceptionSpecification ExceptSpec(Context); 7795 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7796 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7797 BaseEnd = ClassDecl->bases_end(); 7798 Base != BaseEnd; ++Base) { 7799 if (Base->isVirtual()) 7800 continue; 7801 7802 CXXRecordDecl *BaseClassDecl 7803 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7804 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7805 ArgQuals, false, 0)) 7806 ExceptSpec.CalledDecl(CopyAssign); 7807 } 7808 7809 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7810 BaseEnd = ClassDecl->vbases_end(); 7811 Base != BaseEnd; ++Base) { 7812 CXXRecordDecl *BaseClassDecl 7813 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7814 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7815 ArgQuals, false, 0)) 7816 ExceptSpec.CalledDecl(CopyAssign); 7817 } 7818 7819 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7820 FieldEnd = ClassDecl->field_end(); 7821 Field != FieldEnd; 7822 ++Field) { 7823 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7824 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7825 if (CXXMethodDecl *CopyAssign = 7826 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7827 ExceptSpec.CalledDecl(CopyAssign); 7828 } 7829 } 7830 7831 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7832} 7833 7834CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7835 // Note: The following rules are largely analoguous to the copy 7836 // constructor rules. Note that virtual bases are not taken into account 7837 // for determining the argument type of the operator. Note also that 7838 // operators taking an object instead of a reference are allowed. 7839 7840 ImplicitExceptionSpecification Spec(Context); 7841 bool Const; 7842 llvm::tie(Spec, Const) = 7843 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7844 7845 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7846 QualType RetType = Context.getLValueReferenceType(ArgType); 7847 if (Const) 7848 ArgType = ArgType.withConst(); 7849 ArgType = Context.getLValueReferenceType(ArgType); 7850 7851 // An implicitly-declared copy assignment operator is an inline public 7852 // member of its class. 7853 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7854 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7855 SourceLocation ClassLoc = ClassDecl->getLocation(); 7856 DeclarationNameInfo NameInfo(Name, ClassLoc); 7857 CXXMethodDecl *CopyAssignment 7858 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7859 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7860 /*TInfo=*/0, /*isStatic=*/false, 7861 /*StorageClassAsWritten=*/SC_None, 7862 /*isInline=*/true, /*isConstexpr=*/false, 7863 SourceLocation()); 7864 CopyAssignment->setAccess(AS_public); 7865 CopyAssignment->setDefaulted(); 7866 CopyAssignment->setImplicit(); 7867 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7868 7869 // Add the parameter to the operator. 7870 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7871 ClassLoc, ClassLoc, /*Id=*/0, 7872 ArgType, /*TInfo=*/0, 7873 SC_None, 7874 SC_None, 0); 7875 CopyAssignment->setParams(FromParam); 7876 7877 // Note that we have added this copy-assignment operator. 7878 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7879 7880 if (Scope *S = getScopeForContext(ClassDecl)) 7881 PushOnScopeChains(CopyAssignment, S, false); 7882 ClassDecl->addDecl(CopyAssignment); 7883 7884 // C++0x [class.copy]p19: 7885 // .... If the class definition does not explicitly declare a copy 7886 // assignment operator, there is no user-declared move constructor, and 7887 // there is no user-declared move assignment operator, a copy assignment 7888 // operator is implicitly declared as defaulted. 7889 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7890 !getLangOptions().MicrosoftMode) || 7891 ClassDecl->hasUserDeclaredMoveAssignment() || 7892 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7893 CopyAssignment->setDeletedAsWritten(); 7894 7895 AddOverriddenMethods(ClassDecl, CopyAssignment); 7896 return CopyAssignment; 7897} 7898 7899void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7900 CXXMethodDecl *CopyAssignOperator) { 7901 assert((CopyAssignOperator->isDefaulted() && 7902 CopyAssignOperator->isOverloadedOperator() && 7903 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7904 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7905 "DefineImplicitCopyAssignment called for wrong function"); 7906 7907 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7908 7909 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7910 CopyAssignOperator->setInvalidDecl(); 7911 return; 7912 } 7913 7914 CopyAssignOperator->setUsed(); 7915 7916 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7917 DiagnosticErrorTrap Trap(Diags); 7918 7919 // C++0x [class.copy]p30: 7920 // The implicitly-defined or explicitly-defaulted copy assignment operator 7921 // for a non-union class X performs memberwise copy assignment of its 7922 // subobjects. The direct base classes of X are assigned first, in the 7923 // order of their declaration in the base-specifier-list, and then the 7924 // immediate non-static data members of X are assigned, in the order in 7925 // which they were declared in the class definition. 7926 7927 // The statements that form the synthesized function body. 7928 ASTOwningVector<Stmt*> Statements(*this); 7929 7930 // The parameter for the "other" object, which we are copying from. 7931 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7932 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7933 QualType OtherRefType = Other->getType(); 7934 if (const LValueReferenceType *OtherRef 7935 = OtherRefType->getAs<LValueReferenceType>()) { 7936 OtherRefType = OtherRef->getPointeeType(); 7937 OtherQuals = OtherRefType.getQualifiers(); 7938 } 7939 7940 // Our location for everything implicitly-generated. 7941 SourceLocation Loc = CopyAssignOperator->getLocation(); 7942 7943 // Construct a reference to the "other" object. We'll be using this 7944 // throughout the generated ASTs. 7945 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7946 assert(OtherRef && "Reference to parameter cannot fail!"); 7947 7948 // Construct the "this" pointer. We'll be using this throughout the generated 7949 // ASTs. 7950 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7951 assert(This && "Reference to this cannot fail!"); 7952 7953 // Assign base classes. 7954 bool Invalid = false; 7955 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7956 E = ClassDecl->bases_end(); Base != E; ++Base) { 7957 // Form the assignment: 7958 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7959 QualType BaseType = Base->getType().getUnqualifiedType(); 7960 if (!BaseType->isRecordType()) { 7961 Invalid = true; 7962 continue; 7963 } 7964 7965 CXXCastPath BasePath; 7966 BasePath.push_back(Base); 7967 7968 // Construct the "from" expression, which is an implicit cast to the 7969 // appropriately-qualified base type. 7970 Expr *From = OtherRef; 7971 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7972 CK_UncheckedDerivedToBase, 7973 VK_LValue, &BasePath).take(); 7974 7975 // Dereference "this". 7976 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7977 7978 // Implicitly cast "this" to the appropriately-qualified base type. 7979 To = ImpCastExprToType(To.take(), 7980 Context.getCVRQualifiedType(BaseType, 7981 CopyAssignOperator->getTypeQualifiers()), 7982 CK_UncheckedDerivedToBase, 7983 VK_LValue, &BasePath); 7984 7985 // Build the copy. 7986 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7987 To.get(), From, 7988 /*CopyingBaseSubobject=*/true, 7989 /*Copying=*/true); 7990 if (Copy.isInvalid()) { 7991 Diag(CurrentLocation, diag::note_member_synthesized_at) 7992 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7993 CopyAssignOperator->setInvalidDecl(); 7994 return; 7995 } 7996 7997 // Success! Record the copy. 7998 Statements.push_back(Copy.takeAs<Expr>()); 7999 } 8000 8001 // \brief Reference to the __builtin_memcpy function. 8002 Expr *BuiltinMemCpyRef = 0; 8003 // \brief Reference to the __builtin_objc_memmove_collectable function. 8004 Expr *CollectableMemCpyRef = 0; 8005 8006 // Assign non-static members. 8007 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8008 FieldEnd = ClassDecl->field_end(); 8009 Field != FieldEnd; ++Field) { 8010 if (Field->isUnnamedBitfield()) 8011 continue; 8012 8013 // Check for members of reference type; we can't copy those. 8014 if (Field->getType()->isReferenceType()) { 8015 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8016 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8017 Diag(Field->getLocation(), diag::note_declared_at); 8018 Diag(CurrentLocation, diag::note_member_synthesized_at) 8019 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8020 Invalid = true; 8021 continue; 8022 } 8023 8024 // Check for members of const-qualified, non-class type. 8025 QualType BaseType = Context.getBaseElementType(Field->getType()); 8026 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8027 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8028 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8029 Diag(Field->getLocation(), diag::note_declared_at); 8030 Diag(CurrentLocation, diag::note_member_synthesized_at) 8031 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8032 Invalid = true; 8033 continue; 8034 } 8035 8036 // Suppress assigning zero-width bitfields. 8037 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8038 continue; 8039 8040 QualType FieldType = Field->getType().getNonReferenceType(); 8041 if (FieldType->isIncompleteArrayType()) { 8042 assert(ClassDecl->hasFlexibleArrayMember() && 8043 "Incomplete array type is not valid"); 8044 continue; 8045 } 8046 8047 // Build references to the field in the object we're copying from and to. 8048 CXXScopeSpec SS; // Intentionally empty 8049 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8050 LookupMemberName); 8051 MemberLookup.addDecl(*Field); 8052 MemberLookup.resolveKind(); 8053 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8054 Loc, /*IsArrow=*/false, 8055 SS, SourceLocation(), 0, 8056 MemberLookup, 0); 8057 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8058 Loc, /*IsArrow=*/true, 8059 SS, SourceLocation(), 0, 8060 MemberLookup, 0); 8061 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8062 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8063 8064 // If the field should be copied with __builtin_memcpy rather than via 8065 // explicit assignments, do so. This optimization only applies for arrays 8066 // of scalars and arrays of class type with trivial copy-assignment 8067 // operators. 8068 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8069 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8070 // Compute the size of the memory buffer to be copied. 8071 QualType SizeType = Context.getSizeType(); 8072 llvm::APInt Size(Context.getTypeSize(SizeType), 8073 Context.getTypeSizeInChars(BaseType).getQuantity()); 8074 for (const ConstantArrayType *Array 8075 = Context.getAsConstantArrayType(FieldType); 8076 Array; 8077 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8078 llvm::APInt ArraySize 8079 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8080 Size *= ArraySize; 8081 } 8082 8083 // Take the address of the field references for "from" and "to". 8084 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8085 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8086 8087 bool NeedsCollectableMemCpy = 8088 (BaseType->isRecordType() && 8089 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8090 8091 if (NeedsCollectableMemCpy) { 8092 if (!CollectableMemCpyRef) { 8093 // Create a reference to the __builtin_objc_memmove_collectable function. 8094 LookupResult R(*this, 8095 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8096 Loc, LookupOrdinaryName); 8097 LookupName(R, TUScope, true); 8098 8099 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8100 if (!CollectableMemCpy) { 8101 // Something went horribly wrong earlier, and we will have 8102 // complained about it. 8103 Invalid = true; 8104 continue; 8105 } 8106 8107 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8108 CollectableMemCpy->getType(), 8109 VK_LValue, Loc, 0).take(); 8110 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8111 } 8112 } 8113 // Create a reference to the __builtin_memcpy builtin function. 8114 else if (!BuiltinMemCpyRef) { 8115 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8116 LookupOrdinaryName); 8117 LookupName(R, TUScope, true); 8118 8119 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8120 if (!BuiltinMemCpy) { 8121 // Something went horribly wrong earlier, and we will have complained 8122 // about it. 8123 Invalid = true; 8124 continue; 8125 } 8126 8127 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8128 BuiltinMemCpy->getType(), 8129 VK_LValue, Loc, 0).take(); 8130 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8131 } 8132 8133 ASTOwningVector<Expr*> CallArgs(*this); 8134 CallArgs.push_back(To.takeAs<Expr>()); 8135 CallArgs.push_back(From.takeAs<Expr>()); 8136 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8137 ExprResult Call = ExprError(); 8138 if (NeedsCollectableMemCpy) 8139 Call = ActOnCallExpr(/*Scope=*/0, 8140 CollectableMemCpyRef, 8141 Loc, move_arg(CallArgs), 8142 Loc); 8143 else 8144 Call = ActOnCallExpr(/*Scope=*/0, 8145 BuiltinMemCpyRef, 8146 Loc, move_arg(CallArgs), 8147 Loc); 8148 8149 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8150 Statements.push_back(Call.takeAs<Expr>()); 8151 continue; 8152 } 8153 8154 // Build the copy of this field. 8155 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8156 To.get(), From.get(), 8157 /*CopyingBaseSubobject=*/false, 8158 /*Copying=*/true); 8159 if (Copy.isInvalid()) { 8160 Diag(CurrentLocation, diag::note_member_synthesized_at) 8161 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8162 CopyAssignOperator->setInvalidDecl(); 8163 return; 8164 } 8165 8166 // Success! Record the copy. 8167 Statements.push_back(Copy.takeAs<Stmt>()); 8168 } 8169 8170 if (!Invalid) { 8171 // Add a "return *this;" 8172 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8173 8174 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8175 if (Return.isInvalid()) 8176 Invalid = true; 8177 else { 8178 Statements.push_back(Return.takeAs<Stmt>()); 8179 8180 if (Trap.hasErrorOccurred()) { 8181 Diag(CurrentLocation, diag::note_member_synthesized_at) 8182 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8183 Invalid = true; 8184 } 8185 } 8186 } 8187 8188 if (Invalid) { 8189 CopyAssignOperator->setInvalidDecl(); 8190 return; 8191 } 8192 8193 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8194 /*isStmtExpr=*/false); 8195 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8196 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8197 8198 if (ASTMutationListener *L = getASTMutationListener()) { 8199 L->CompletedImplicitDefinition(CopyAssignOperator); 8200 } 8201} 8202 8203Sema::ImplicitExceptionSpecification 8204Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8205 ImplicitExceptionSpecification ExceptSpec(Context); 8206 8207 if (ClassDecl->isInvalidDecl()) 8208 return ExceptSpec; 8209 8210 // C++0x [except.spec]p14: 8211 // An implicitly declared special member function (Clause 12) shall have an 8212 // exception-specification. [...] 8213 8214 // It is unspecified whether or not an implicit move assignment operator 8215 // attempts to deduplicate calls to assignment operators of virtual bases are 8216 // made. As such, this exception specification is effectively unspecified. 8217 // Based on a similar decision made for constness in C++0x, we're erring on 8218 // the side of assuming such calls to be made regardless of whether they 8219 // actually happen. 8220 // Note that a move constructor is not implicitly declared when there are 8221 // virtual bases, but it can still be user-declared and explicitly defaulted. 8222 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8223 BaseEnd = ClassDecl->bases_end(); 8224 Base != BaseEnd; ++Base) { 8225 if (Base->isVirtual()) 8226 continue; 8227 8228 CXXRecordDecl *BaseClassDecl 8229 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8230 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8231 false, 0)) 8232 ExceptSpec.CalledDecl(MoveAssign); 8233 } 8234 8235 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8236 BaseEnd = ClassDecl->vbases_end(); 8237 Base != BaseEnd; ++Base) { 8238 CXXRecordDecl *BaseClassDecl 8239 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8240 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8241 false, 0)) 8242 ExceptSpec.CalledDecl(MoveAssign); 8243 } 8244 8245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8246 FieldEnd = ClassDecl->field_end(); 8247 Field != FieldEnd; 8248 ++Field) { 8249 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8250 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8251 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8252 false, 0)) 8253 ExceptSpec.CalledDecl(MoveAssign); 8254 } 8255 } 8256 8257 return ExceptSpec; 8258} 8259 8260CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8261 // Note: The following rules are largely analoguous to the move 8262 // constructor rules. 8263 8264 ImplicitExceptionSpecification Spec( 8265 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8266 8267 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8268 QualType RetType = Context.getLValueReferenceType(ArgType); 8269 ArgType = Context.getRValueReferenceType(ArgType); 8270 8271 // An implicitly-declared move assignment operator is an inline public 8272 // member of its class. 8273 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8274 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8275 SourceLocation ClassLoc = ClassDecl->getLocation(); 8276 DeclarationNameInfo NameInfo(Name, ClassLoc); 8277 CXXMethodDecl *MoveAssignment 8278 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8279 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8280 /*TInfo=*/0, /*isStatic=*/false, 8281 /*StorageClassAsWritten=*/SC_None, 8282 /*isInline=*/true, 8283 /*isConstexpr=*/false, 8284 SourceLocation()); 8285 MoveAssignment->setAccess(AS_public); 8286 MoveAssignment->setDefaulted(); 8287 MoveAssignment->setImplicit(); 8288 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8289 8290 // Add the parameter to the operator. 8291 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8292 ClassLoc, ClassLoc, /*Id=*/0, 8293 ArgType, /*TInfo=*/0, 8294 SC_None, 8295 SC_None, 0); 8296 MoveAssignment->setParams(FromParam); 8297 8298 // Note that we have added this copy-assignment operator. 8299 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8300 8301 // C++0x [class.copy]p9: 8302 // If the definition of a class X does not explicitly declare a move 8303 // assignment operator, one will be implicitly declared as defaulted if and 8304 // only if: 8305 // [...] 8306 // - the move assignment operator would not be implicitly defined as 8307 // deleted. 8308 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8309 // Cache this result so that we don't try to generate this over and over 8310 // on every lookup, leaking memory and wasting time. 8311 ClassDecl->setFailedImplicitMoveAssignment(); 8312 return 0; 8313 } 8314 8315 if (Scope *S = getScopeForContext(ClassDecl)) 8316 PushOnScopeChains(MoveAssignment, S, false); 8317 ClassDecl->addDecl(MoveAssignment); 8318 8319 AddOverriddenMethods(ClassDecl, MoveAssignment); 8320 return MoveAssignment; 8321} 8322 8323void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8324 CXXMethodDecl *MoveAssignOperator) { 8325 assert((MoveAssignOperator->isDefaulted() && 8326 MoveAssignOperator->isOverloadedOperator() && 8327 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8328 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8329 "DefineImplicitMoveAssignment called for wrong function"); 8330 8331 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8332 8333 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8334 MoveAssignOperator->setInvalidDecl(); 8335 return; 8336 } 8337 8338 MoveAssignOperator->setUsed(); 8339 8340 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8341 DiagnosticErrorTrap Trap(Diags); 8342 8343 // C++0x [class.copy]p28: 8344 // The implicitly-defined or move assignment operator for a non-union class 8345 // X performs memberwise move assignment of its subobjects. The direct base 8346 // classes of X are assigned first, in the order of their declaration in the 8347 // base-specifier-list, and then the immediate non-static data members of X 8348 // are assigned, in the order in which they were declared in the class 8349 // definition. 8350 8351 // The statements that form the synthesized function body. 8352 ASTOwningVector<Stmt*> Statements(*this); 8353 8354 // The parameter for the "other" object, which we are move from. 8355 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8356 QualType OtherRefType = Other->getType()-> 8357 getAs<RValueReferenceType>()->getPointeeType(); 8358 assert(OtherRefType.getQualifiers() == 0 && 8359 "Bad argument type of defaulted move assignment"); 8360 8361 // Our location for everything implicitly-generated. 8362 SourceLocation Loc = MoveAssignOperator->getLocation(); 8363 8364 // Construct a reference to the "other" object. We'll be using this 8365 // throughout the generated ASTs. 8366 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8367 assert(OtherRef && "Reference to parameter cannot fail!"); 8368 // Cast to rvalue. 8369 OtherRef = CastForMoving(*this, OtherRef); 8370 8371 // Construct the "this" pointer. We'll be using this throughout the generated 8372 // ASTs. 8373 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8374 assert(This && "Reference to this cannot fail!"); 8375 8376 // Assign base classes. 8377 bool Invalid = false; 8378 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8379 E = ClassDecl->bases_end(); Base != E; ++Base) { 8380 // Form the assignment: 8381 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8382 QualType BaseType = Base->getType().getUnqualifiedType(); 8383 if (!BaseType->isRecordType()) { 8384 Invalid = true; 8385 continue; 8386 } 8387 8388 CXXCastPath BasePath; 8389 BasePath.push_back(Base); 8390 8391 // Construct the "from" expression, which is an implicit cast to the 8392 // appropriately-qualified base type. 8393 Expr *From = OtherRef; 8394 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8395 VK_XValue, &BasePath).take(); 8396 8397 // Dereference "this". 8398 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8399 8400 // Implicitly cast "this" to the appropriately-qualified base type. 8401 To = ImpCastExprToType(To.take(), 8402 Context.getCVRQualifiedType(BaseType, 8403 MoveAssignOperator->getTypeQualifiers()), 8404 CK_UncheckedDerivedToBase, 8405 VK_LValue, &BasePath); 8406 8407 // Build the move. 8408 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8409 To.get(), From, 8410 /*CopyingBaseSubobject=*/true, 8411 /*Copying=*/false); 8412 if (Move.isInvalid()) { 8413 Diag(CurrentLocation, diag::note_member_synthesized_at) 8414 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8415 MoveAssignOperator->setInvalidDecl(); 8416 return; 8417 } 8418 8419 // Success! Record the move. 8420 Statements.push_back(Move.takeAs<Expr>()); 8421 } 8422 8423 // \brief Reference to the __builtin_memcpy function. 8424 Expr *BuiltinMemCpyRef = 0; 8425 // \brief Reference to the __builtin_objc_memmove_collectable function. 8426 Expr *CollectableMemCpyRef = 0; 8427 8428 // Assign non-static members. 8429 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8430 FieldEnd = ClassDecl->field_end(); 8431 Field != FieldEnd; ++Field) { 8432 if (Field->isUnnamedBitfield()) 8433 continue; 8434 8435 // Check for members of reference type; we can't move those. 8436 if (Field->getType()->isReferenceType()) { 8437 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8438 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8439 Diag(Field->getLocation(), diag::note_declared_at); 8440 Diag(CurrentLocation, diag::note_member_synthesized_at) 8441 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8442 Invalid = true; 8443 continue; 8444 } 8445 8446 // Check for members of const-qualified, non-class type. 8447 QualType BaseType = Context.getBaseElementType(Field->getType()); 8448 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8449 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8450 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8451 Diag(Field->getLocation(), diag::note_declared_at); 8452 Diag(CurrentLocation, diag::note_member_synthesized_at) 8453 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8454 Invalid = true; 8455 continue; 8456 } 8457 8458 // Suppress assigning zero-width bitfields. 8459 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8460 continue; 8461 8462 QualType FieldType = Field->getType().getNonReferenceType(); 8463 if (FieldType->isIncompleteArrayType()) { 8464 assert(ClassDecl->hasFlexibleArrayMember() && 8465 "Incomplete array type is not valid"); 8466 continue; 8467 } 8468 8469 // Build references to the field in the object we're copying from and to. 8470 CXXScopeSpec SS; // Intentionally empty 8471 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8472 LookupMemberName); 8473 MemberLookup.addDecl(*Field); 8474 MemberLookup.resolveKind(); 8475 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8476 Loc, /*IsArrow=*/false, 8477 SS, SourceLocation(), 0, 8478 MemberLookup, 0); 8479 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8480 Loc, /*IsArrow=*/true, 8481 SS, SourceLocation(), 0, 8482 MemberLookup, 0); 8483 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8484 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8485 8486 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8487 "Member reference with rvalue base must be rvalue except for reference " 8488 "members, which aren't allowed for move assignment."); 8489 8490 // If the field should be copied with __builtin_memcpy rather than via 8491 // explicit assignments, do so. This optimization only applies for arrays 8492 // of scalars and arrays of class type with trivial move-assignment 8493 // operators. 8494 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8495 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8496 // Compute the size of the memory buffer to be copied. 8497 QualType SizeType = Context.getSizeType(); 8498 llvm::APInt Size(Context.getTypeSize(SizeType), 8499 Context.getTypeSizeInChars(BaseType).getQuantity()); 8500 for (const ConstantArrayType *Array 8501 = Context.getAsConstantArrayType(FieldType); 8502 Array; 8503 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8504 llvm::APInt ArraySize 8505 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8506 Size *= ArraySize; 8507 } 8508 8509 // Take the address of the field references for "from" and "to". We 8510 // directly construct UnaryOperators here because semantic analysis 8511 // does not permit us to take the address of an xvalue. 8512 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8513 Context.getPointerType(From.get()->getType()), 8514 VK_RValue, OK_Ordinary, Loc); 8515 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8516 Context.getPointerType(To.get()->getType()), 8517 VK_RValue, OK_Ordinary, Loc); 8518 8519 bool NeedsCollectableMemCpy = 8520 (BaseType->isRecordType() && 8521 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8522 8523 if (NeedsCollectableMemCpy) { 8524 if (!CollectableMemCpyRef) { 8525 // Create a reference to the __builtin_objc_memmove_collectable function. 8526 LookupResult R(*this, 8527 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8528 Loc, LookupOrdinaryName); 8529 LookupName(R, TUScope, true); 8530 8531 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8532 if (!CollectableMemCpy) { 8533 // Something went horribly wrong earlier, and we will have 8534 // complained about it. 8535 Invalid = true; 8536 continue; 8537 } 8538 8539 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8540 CollectableMemCpy->getType(), 8541 VK_LValue, Loc, 0).take(); 8542 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8543 } 8544 } 8545 // Create a reference to the __builtin_memcpy builtin function. 8546 else if (!BuiltinMemCpyRef) { 8547 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8548 LookupOrdinaryName); 8549 LookupName(R, TUScope, true); 8550 8551 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8552 if (!BuiltinMemCpy) { 8553 // Something went horribly wrong earlier, and we will have complained 8554 // about it. 8555 Invalid = true; 8556 continue; 8557 } 8558 8559 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8560 BuiltinMemCpy->getType(), 8561 VK_LValue, Loc, 0).take(); 8562 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8563 } 8564 8565 ASTOwningVector<Expr*> CallArgs(*this); 8566 CallArgs.push_back(To.takeAs<Expr>()); 8567 CallArgs.push_back(From.takeAs<Expr>()); 8568 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8569 ExprResult Call = ExprError(); 8570 if (NeedsCollectableMemCpy) 8571 Call = ActOnCallExpr(/*Scope=*/0, 8572 CollectableMemCpyRef, 8573 Loc, move_arg(CallArgs), 8574 Loc); 8575 else 8576 Call = ActOnCallExpr(/*Scope=*/0, 8577 BuiltinMemCpyRef, 8578 Loc, move_arg(CallArgs), 8579 Loc); 8580 8581 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8582 Statements.push_back(Call.takeAs<Expr>()); 8583 continue; 8584 } 8585 8586 // Build the move of this field. 8587 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8588 To.get(), From.get(), 8589 /*CopyingBaseSubobject=*/false, 8590 /*Copying=*/false); 8591 if (Move.isInvalid()) { 8592 Diag(CurrentLocation, diag::note_member_synthesized_at) 8593 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8594 MoveAssignOperator->setInvalidDecl(); 8595 return; 8596 } 8597 8598 // Success! Record the copy. 8599 Statements.push_back(Move.takeAs<Stmt>()); 8600 } 8601 8602 if (!Invalid) { 8603 // Add a "return *this;" 8604 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8605 8606 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8607 if (Return.isInvalid()) 8608 Invalid = true; 8609 else { 8610 Statements.push_back(Return.takeAs<Stmt>()); 8611 8612 if (Trap.hasErrorOccurred()) { 8613 Diag(CurrentLocation, diag::note_member_synthesized_at) 8614 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8615 Invalid = true; 8616 } 8617 } 8618 } 8619 8620 if (Invalid) { 8621 MoveAssignOperator->setInvalidDecl(); 8622 return; 8623 } 8624 8625 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8626 /*isStmtExpr=*/false); 8627 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8628 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8629 8630 if (ASTMutationListener *L = getASTMutationListener()) { 8631 L->CompletedImplicitDefinition(MoveAssignOperator); 8632 } 8633} 8634 8635std::pair<Sema::ImplicitExceptionSpecification, bool> 8636Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8637 if (ClassDecl->isInvalidDecl()) 8638 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8639 8640 // C++ [class.copy]p5: 8641 // The implicitly-declared copy constructor for a class X will 8642 // have the form 8643 // 8644 // X::X(const X&) 8645 // 8646 // if 8647 // FIXME: It ought to be possible to store this on the record. 8648 bool HasConstCopyConstructor = true; 8649 8650 // -- each direct or virtual base class B of X has a copy 8651 // constructor whose first parameter is of type const B& or 8652 // const volatile B&, and 8653 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8654 BaseEnd = ClassDecl->bases_end(); 8655 HasConstCopyConstructor && Base != BaseEnd; 8656 ++Base) { 8657 // Virtual bases are handled below. 8658 if (Base->isVirtual()) 8659 continue; 8660 8661 CXXRecordDecl *BaseClassDecl 8662 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8663 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8664 &HasConstCopyConstructor); 8665 } 8666 8667 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8668 BaseEnd = ClassDecl->vbases_end(); 8669 HasConstCopyConstructor && Base != BaseEnd; 8670 ++Base) { 8671 CXXRecordDecl *BaseClassDecl 8672 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8673 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8674 &HasConstCopyConstructor); 8675 } 8676 8677 // -- for all the nonstatic data members of X that are of a 8678 // class type M (or array thereof), each such class type 8679 // has a copy constructor whose first parameter is of type 8680 // const M& or const volatile M&. 8681 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8682 FieldEnd = ClassDecl->field_end(); 8683 HasConstCopyConstructor && Field != FieldEnd; 8684 ++Field) { 8685 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8686 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8687 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8688 &HasConstCopyConstructor); 8689 } 8690 } 8691 // Otherwise, the implicitly declared copy constructor will have 8692 // the form 8693 // 8694 // X::X(X&) 8695 8696 // C++ [except.spec]p14: 8697 // An implicitly declared special member function (Clause 12) shall have an 8698 // exception-specification. [...] 8699 ImplicitExceptionSpecification ExceptSpec(Context); 8700 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8701 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8702 BaseEnd = ClassDecl->bases_end(); 8703 Base != BaseEnd; 8704 ++Base) { 8705 // Virtual bases are handled below. 8706 if (Base->isVirtual()) 8707 continue; 8708 8709 CXXRecordDecl *BaseClassDecl 8710 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8711 if (CXXConstructorDecl *CopyConstructor = 8712 LookupCopyingConstructor(BaseClassDecl, Quals)) 8713 ExceptSpec.CalledDecl(CopyConstructor); 8714 } 8715 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8716 BaseEnd = ClassDecl->vbases_end(); 8717 Base != BaseEnd; 8718 ++Base) { 8719 CXXRecordDecl *BaseClassDecl 8720 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8721 if (CXXConstructorDecl *CopyConstructor = 8722 LookupCopyingConstructor(BaseClassDecl, Quals)) 8723 ExceptSpec.CalledDecl(CopyConstructor); 8724 } 8725 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8726 FieldEnd = ClassDecl->field_end(); 8727 Field != FieldEnd; 8728 ++Field) { 8729 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8730 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8731 if (CXXConstructorDecl *CopyConstructor = 8732 LookupCopyingConstructor(FieldClassDecl, Quals)) 8733 ExceptSpec.CalledDecl(CopyConstructor); 8734 } 8735 } 8736 8737 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8738} 8739 8740CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8741 CXXRecordDecl *ClassDecl) { 8742 // C++ [class.copy]p4: 8743 // If the class definition does not explicitly declare a copy 8744 // constructor, one is declared implicitly. 8745 8746 ImplicitExceptionSpecification Spec(Context); 8747 bool Const; 8748 llvm::tie(Spec, Const) = 8749 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8750 8751 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8752 QualType ArgType = ClassType; 8753 if (Const) 8754 ArgType = ArgType.withConst(); 8755 ArgType = Context.getLValueReferenceType(ArgType); 8756 8757 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8758 8759 DeclarationName Name 8760 = Context.DeclarationNames.getCXXConstructorName( 8761 Context.getCanonicalType(ClassType)); 8762 SourceLocation ClassLoc = ClassDecl->getLocation(); 8763 DeclarationNameInfo NameInfo(Name, ClassLoc); 8764 8765 // An implicitly-declared copy constructor is an inline public 8766 // member of its class. 8767 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8768 Context, ClassDecl, ClassLoc, NameInfo, 8769 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8770 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8771 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8772 getLangOptions().CPlusPlus0x); 8773 CopyConstructor->setAccess(AS_public); 8774 CopyConstructor->setDefaulted(); 8775 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8776 8777 // Note that we have declared this constructor. 8778 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8779 8780 // Add the parameter to the constructor. 8781 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8782 ClassLoc, ClassLoc, 8783 /*IdentifierInfo=*/0, 8784 ArgType, /*TInfo=*/0, 8785 SC_None, 8786 SC_None, 0); 8787 CopyConstructor->setParams(FromParam); 8788 8789 if (Scope *S = getScopeForContext(ClassDecl)) 8790 PushOnScopeChains(CopyConstructor, S, false); 8791 ClassDecl->addDecl(CopyConstructor); 8792 8793 // C++11 [class.copy]p8: 8794 // ... If the class definition does not explicitly declare a copy 8795 // constructor, there is no user-declared move constructor, and there is no 8796 // user-declared move assignment operator, a copy constructor is implicitly 8797 // declared as defaulted. 8798 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8799 (ClassDecl->hasUserDeclaredMoveAssignment() && 8800 !getLangOptions().MicrosoftMode) || 8801 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8802 CopyConstructor->setDeletedAsWritten(); 8803 8804 return CopyConstructor; 8805} 8806 8807void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8808 CXXConstructorDecl *CopyConstructor) { 8809 assert((CopyConstructor->isDefaulted() && 8810 CopyConstructor->isCopyConstructor() && 8811 !CopyConstructor->doesThisDeclarationHaveABody()) && 8812 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8813 8814 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8815 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8816 8817 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8818 DiagnosticErrorTrap Trap(Diags); 8819 8820 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8821 Trap.hasErrorOccurred()) { 8822 Diag(CurrentLocation, diag::note_member_synthesized_at) 8823 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8824 CopyConstructor->setInvalidDecl(); 8825 } else { 8826 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8827 CopyConstructor->getLocation(), 8828 MultiStmtArg(*this, 0, 0), 8829 /*isStmtExpr=*/false) 8830 .takeAs<Stmt>()); 8831 CopyConstructor->setImplicitlyDefined(true); 8832 } 8833 8834 CopyConstructor->setUsed(); 8835 if (ASTMutationListener *L = getASTMutationListener()) { 8836 L->CompletedImplicitDefinition(CopyConstructor); 8837 } 8838} 8839 8840Sema::ImplicitExceptionSpecification 8841Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8842 // C++ [except.spec]p14: 8843 // An implicitly declared special member function (Clause 12) shall have an 8844 // exception-specification. [...] 8845 ImplicitExceptionSpecification ExceptSpec(Context); 8846 if (ClassDecl->isInvalidDecl()) 8847 return ExceptSpec; 8848 8849 // Direct base-class constructors. 8850 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8851 BEnd = ClassDecl->bases_end(); 8852 B != BEnd; ++B) { 8853 if (B->isVirtual()) // Handled below. 8854 continue; 8855 8856 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8857 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8858 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8859 // If this is a deleted function, add it anyway. This might be conformant 8860 // with the standard. This might not. I'm not sure. It might not matter. 8861 if (Constructor) 8862 ExceptSpec.CalledDecl(Constructor); 8863 } 8864 } 8865 8866 // Virtual base-class constructors. 8867 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8868 BEnd = ClassDecl->vbases_end(); 8869 B != BEnd; ++B) { 8870 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8871 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8872 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8873 // If this is a deleted function, add it anyway. This might be conformant 8874 // with the standard. This might not. I'm not sure. It might not matter. 8875 if (Constructor) 8876 ExceptSpec.CalledDecl(Constructor); 8877 } 8878 } 8879 8880 // Field constructors. 8881 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8882 FEnd = ClassDecl->field_end(); 8883 F != FEnd; ++F) { 8884 if (const RecordType *RecordTy 8885 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8886 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8887 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8888 // If this is a deleted function, add it anyway. This might be conformant 8889 // with the standard. This might not. I'm not sure. It might not matter. 8890 // In particular, the problem is that this function never gets called. It 8891 // might just be ill-formed because this function attempts to refer to 8892 // a deleted function here. 8893 if (Constructor) 8894 ExceptSpec.CalledDecl(Constructor); 8895 } 8896 } 8897 8898 return ExceptSpec; 8899} 8900 8901CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8902 CXXRecordDecl *ClassDecl) { 8903 ImplicitExceptionSpecification Spec( 8904 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8905 8906 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8907 QualType ArgType = Context.getRValueReferenceType(ClassType); 8908 8909 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8910 8911 DeclarationName Name 8912 = Context.DeclarationNames.getCXXConstructorName( 8913 Context.getCanonicalType(ClassType)); 8914 SourceLocation ClassLoc = ClassDecl->getLocation(); 8915 DeclarationNameInfo NameInfo(Name, ClassLoc); 8916 8917 // C++0x [class.copy]p11: 8918 // An implicitly-declared copy/move constructor is an inline public 8919 // member of its class. 8920 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8921 Context, ClassDecl, ClassLoc, NameInfo, 8922 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8923 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8924 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8925 getLangOptions().CPlusPlus0x); 8926 MoveConstructor->setAccess(AS_public); 8927 MoveConstructor->setDefaulted(); 8928 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8929 8930 // Add the parameter to the constructor. 8931 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8932 ClassLoc, ClassLoc, 8933 /*IdentifierInfo=*/0, 8934 ArgType, /*TInfo=*/0, 8935 SC_None, 8936 SC_None, 0); 8937 MoveConstructor->setParams(FromParam); 8938 8939 // C++0x [class.copy]p9: 8940 // If the definition of a class X does not explicitly declare a move 8941 // constructor, one will be implicitly declared as defaulted if and only if: 8942 // [...] 8943 // - the move constructor would not be implicitly defined as deleted. 8944 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8945 // Cache this result so that we don't try to generate this over and over 8946 // on every lookup, leaking memory and wasting time. 8947 ClassDecl->setFailedImplicitMoveConstructor(); 8948 return 0; 8949 } 8950 8951 // Note that we have declared this constructor. 8952 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8953 8954 if (Scope *S = getScopeForContext(ClassDecl)) 8955 PushOnScopeChains(MoveConstructor, S, false); 8956 ClassDecl->addDecl(MoveConstructor); 8957 8958 return MoveConstructor; 8959} 8960 8961void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8962 CXXConstructorDecl *MoveConstructor) { 8963 assert((MoveConstructor->isDefaulted() && 8964 MoveConstructor->isMoveConstructor() && 8965 !MoveConstructor->doesThisDeclarationHaveABody()) && 8966 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8967 8968 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8969 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8970 8971 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8972 DiagnosticErrorTrap Trap(Diags); 8973 8974 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8975 Trap.hasErrorOccurred()) { 8976 Diag(CurrentLocation, diag::note_member_synthesized_at) 8977 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8978 MoveConstructor->setInvalidDecl(); 8979 } else { 8980 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8981 MoveConstructor->getLocation(), 8982 MultiStmtArg(*this, 0, 0), 8983 /*isStmtExpr=*/false) 8984 .takeAs<Stmt>()); 8985 MoveConstructor->setImplicitlyDefined(true); 8986 } 8987 8988 MoveConstructor->setUsed(); 8989 8990 if (ASTMutationListener *L = getASTMutationListener()) { 8991 L->CompletedImplicitDefinition(MoveConstructor); 8992 } 8993} 8994 8995ExprResult 8996Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8997 CXXConstructorDecl *Constructor, 8998 MultiExprArg ExprArgs, 8999 bool HadMultipleCandidates, 9000 bool RequiresZeroInit, 9001 unsigned ConstructKind, 9002 SourceRange ParenRange) { 9003 bool Elidable = false; 9004 9005 // C++0x [class.copy]p34: 9006 // When certain criteria are met, an implementation is allowed to 9007 // omit the copy/move construction of a class object, even if the 9008 // copy/move constructor and/or destructor for the object have 9009 // side effects. [...] 9010 // - when a temporary class object that has not been bound to a 9011 // reference (12.2) would be copied/moved to a class object 9012 // with the same cv-unqualified type, the copy/move operation 9013 // can be omitted by constructing the temporary object 9014 // directly into the target of the omitted copy/move 9015 if (ConstructKind == CXXConstructExpr::CK_Complete && 9016 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 9017 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9018 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9019 } 9020 9021 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9022 Elidable, move(ExprArgs), HadMultipleCandidates, 9023 RequiresZeroInit, ConstructKind, ParenRange); 9024} 9025 9026/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9027/// including handling of its default argument expressions. 9028ExprResult 9029Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9030 CXXConstructorDecl *Constructor, bool Elidable, 9031 MultiExprArg ExprArgs, 9032 bool HadMultipleCandidates, 9033 bool RequiresZeroInit, 9034 unsigned ConstructKind, 9035 SourceRange ParenRange) { 9036 unsigned NumExprs = ExprArgs.size(); 9037 Expr **Exprs = (Expr **)ExprArgs.release(); 9038 9039 for (specific_attr_iterator<NonNullAttr> 9040 i = Constructor->specific_attr_begin<NonNullAttr>(), 9041 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9042 const NonNullAttr *NonNull = *i; 9043 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9044 } 9045 9046 MarkFunctionReferenced(ConstructLoc, Constructor); 9047 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9048 Constructor, Elidable, Exprs, NumExprs, 9049 HadMultipleCandidates, RequiresZeroInit, 9050 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9051 ParenRange)); 9052} 9053 9054bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9055 CXXConstructorDecl *Constructor, 9056 MultiExprArg Exprs, 9057 bool HadMultipleCandidates) { 9058 // FIXME: Provide the correct paren SourceRange when available. 9059 ExprResult TempResult = 9060 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9061 move(Exprs), HadMultipleCandidates, false, 9062 CXXConstructExpr::CK_Complete, SourceRange()); 9063 if (TempResult.isInvalid()) 9064 return true; 9065 9066 Expr *Temp = TempResult.takeAs<Expr>(); 9067 CheckImplicitConversions(Temp, VD->getLocation()); 9068 MarkFunctionReferenced(VD->getLocation(), Constructor); 9069 Temp = MaybeCreateExprWithCleanups(Temp); 9070 VD->setInit(Temp); 9071 9072 return false; 9073} 9074 9075void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9076 if (VD->isInvalidDecl()) return; 9077 9078 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9079 if (ClassDecl->isInvalidDecl()) return; 9080 if (ClassDecl->hasTrivialDestructor()) return; 9081 if (ClassDecl->isDependentContext()) return; 9082 9083 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9084 MarkFunctionReferenced(VD->getLocation(), Destructor); 9085 CheckDestructorAccess(VD->getLocation(), Destructor, 9086 PDiag(diag::err_access_dtor_var) 9087 << VD->getDeclName() 9088 << VD->getType()); 9089 9090 if (!VD->hasGlobalStorage()) return; 9091 9092 // Emit warning for non-trivial dtor in global scope (a real global, 9093 // class-static, function-static). 9094 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9095 9096 // TODO: this should be re-enabled for static locals by !CXAAtExit 9097 if (!VD->isStaticLocal()) 9098 Diag(VD->getLocation(), diag::warn_global_destructor); 9099} 9100 9101/// AddCXXDirectInitializerToDecl - This action is called immediately after 9102/// ActOnDeclarator, when a C++ direct initializer is present. 9103/// e.g: "int x(1);" 9104void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9105 SourceLocation LParenLoc, 9106 MultiExprArg Exprs, 9107 SourceLocation RParenLoc, 9108 bool TypeMayContainAuto) { 9109 // If there is no declaration, there was an error parsing it. Just ignore 9110 // the initializer. 9111 if (RealDecl == 0) 9112 return; 9113 9114 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9115 if (!VDecl) { 9116 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9117 RealDecl->setInvalidDecl(); 9118 return; 9119 } 9120 9121 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9122 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9123 if (Exprs.size() == 0) { 9124 // It isn't possible to write this directly, but it is possible to 9125 // end up in this situation with "auto x(some_pack...);" 9126 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 9127 << VDecl->getDeclName() << VDecl->getType() 9128 << VDecl->getSourceRange(); 9129 RealDecl->setInvalidDecl(); 9130 return; 9131 } 9132 9133 if (Exprs.size() > 1) { 9134 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9135 diag::err_auto_var_init_multiple_expressions) 9136 << VDecl->getDeclName() << VDecl->getType() 9137 << VDecl->getSourceRange(); 9138 RealDecl->setInvalidDecl(); 9139 return; 9140 } 9141 9142 Expr *Init = Exprs.get()[0]; 9143 TypeSourceInfo *DeducedType = 0; 9144 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 9145 DAR_Failed) 9146 DiagnoseAutoDeductionFailure(VDecl, Init); 9147 if (!DeducedType) { 9148 RealDecl->setInvalidDecl(); 9149 return; 9150 } 9151 VDecl->setTypeSourceInfo(DeducedType); 9152 VDecl->setType(DeducedType->getType()); 9153 9154 // In ARC, infer lifetime. 9155 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9156 VDecl->setInvalidDecl(); 9157 9158 // If this is a redeclaration, check that the type we just deduced matches 9159 // the previously declared type. 9160 if (VarDecl *Old = VDecl->getPreviousDecl()) 9161 MergeVarDeclTypes(VDecl, Old); 9162 } 9163 9164 // We will represent direct-initialization similarly to copy-initialization: 9165 // int x(1); -as-> int x = 1; 9166 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9167 // 9168 // Clients that want to distinguish between the two forms, can check for 9169 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9170 // A major benefit is that clients that don't particularly care about which 9171 // exactly form was it (like the CodeGen) can handle both cases without 9172 // special case code. 9173 9174 // C++ 8.5p11: 9175 // The form of initialization (using parentheses or '=') is generally 9176 // insignificant, but does matter when the entity being initialized has a 9177 // class type. 9178 9179 if (!VDecl->getType()->isDependentType() && 9180 !VDecl->getType()->isIncompleteArrayType() && 9181 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9182 diag::err_typecheck_decl_incomplete_type)) { 9183 VDecl->setInvalidDecl(); 9184 return; 9185 } 9186 9187 // The variable can not have an abstract class type. 9188 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9189 diag::err_abstract_type_in_decl, 9190 AbstractVariableType)) 9191 VDecl->setInvalidDecl(); 9192 9193 const VarDecl *Def; 9194 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9195 Diag(VDecl->getLocation(), diag::err_redefinition) 9196 << VDecl->getDeclName(); 9197 Diag(Def->getLocation(), diag::note_previous_definition); 9198 VDecl->setInvalidDecl(); 9199 return; 9200 } 9201 9202 // C++ [class.static.data]p4 9203 // If a static data member is of const integral or const 9204 // enumeration type, its declaration in the class definition can 9205 // specify a constant-initializer which shall be an integral 9206 // constant expression (5.19). In that case, the member can appear 9207 // in integral constant expressions. The member shall still be 9208 // defined in a namespace scope if it is used in the program and the 9209 // namespace scope definition shall not contain an initializer. 9210 // 9211 // We already performed a redefinition check above, but for static 9212 // data members we also need to check whether there was an in-class 9213 // declaration with an initializer. 9214 const VarDecl* PrevInit = 0; 9215 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9216 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9217 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9218 return; 9219 } 9220 9221 bool IsDependent = false; 9222 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9223 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9224 VDecl->setInvalidDecl(); 9225 return; 9226 } 9227 9228 if (Exprs.get()[I]->isTypeDependent()) 9229 IsDependent = true; 9230 } 9231 9232 // If either the declaration has a dependent type or if any of the 9233 // expressions is type-dependent, we represent the initialization 9234 // via a ParenListExpr for later use during template instantiation. 9235 if (VDecl->getType()->isDependentType() || IsDependent) { 9236 // Let clients know that initialization was done with a direct initializer. 9237 VDecl->setCXXDirectInitializer(true); 9238 9239 // Store the initialization expressions as a ParenListExpr. 9240 unsigned NumExprs = Exprs.size(); 9241 VDecl->setInit(new (Context) ParenListExpr( 9242 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9243 VDecl->getType().getNonReferenceType())); 9244 return; 9245 } 9246 9247 // Capture the variable that is being initialized and the style of 9248 // initialization. 9249 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9250 9251 // FIXME: Poor source location information. 9252 InitializationKind Kind 9253 = InitializationKind::CreateDirect(VDecl->getLocation(), 9254 LParenLoc, RParenLoc); 9255 9256 QualType T = VDecl->getType(); 9257 InitializationSequence InitSeq(*this, Entity, Kind, 9258 Exprs.get(), Exprs.size()); 9259 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9260 if (Result.isInvalid()) { 9261 VDecl->setInvalidDecl(); 9262 return; 9263 } else if (T != VDecl->getType()) { 9264 VDecl->setType(T); 9265 Result.get()->setType(T); 9266 } 9267 9268 9269 Expr *Init = Result.get(); 9270 CheckImplicitConversions(Init, LParenLoc); 9271 9272 Init = MaybeCreateExprWithCleanups(Init); 9273 VDecl->setInit(Init); 9274 VDecl->setCXXDirectInitializer(true); 9275 9276 CheckCompleteVariableDeclaration(VDecl); 9277} 9278 9279/// \brief Given a constructor and the set of arguments provided for the 9280/// constructor, convert the arguments and add any required default arguments 9281/// to form a proper call to this constructor. 9282/// 9283/// \returns true if an error occurred, false otherwise. 9284bool 9285Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9286 MultiExprArg ArgsPtr, 9287 SourceLocation Loc, 9288 ASTOwningVector<Expr*> &ConvertedArgs) { 9289 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9290 unsigned NumArgs = ArgsPtr.size(); 9291 Expr **Args = (Expr **)ArgsPtr.get(); 9292 9293 const FunctionProtoType *Proto 9294 = Constructor->getType()->getAs<FunctionProtoType>(); 9295 assert(Proto && "Constructor without a prototype?"); 9296 unsigned NumArgsInProto = Proto->getNumArgs(); 9297 9298 // If too few arguments are available, we'll fill in the rest with defaults. 9299 if (NumArgs < NumArgsInProto) 9300 ConvertedArgs.reserve(NumArgsInProto); 9301 else 9302 ConvertedArgs.reserve(NumArgs); 9303 9304 VariadicCallType CallType = 9305 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9306 SmallVector<Expr *, 8> AllArgs; 9307 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9308 Proto, 0, Args, NumArgs, AllArgs, 9309 CallType); 9310 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9311 ConvertedArgs.push_back(AllArgs[i]); 9312 return Invalid; 9313} 9314 9315static inline bool 9316CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9317 const FunctionDecl *FnDecl) { 9318 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9319 if (isa<NamespaceDecl>(DC)) { 9320 return SemaRef.Diag(FnDecl->getLocation(), 9321 diag::err_operator_new_delete_declared_in_namespace) 9322 << FnDecl->getDeclName(); 9323 } 9324 9325 if (isa<TranslationUnitDecl>(DC) && 9326 FnDecl->getStorageClass() == SC_Static) { 9327 return SemaRef.Diag(FnDecl->getLocation(), 9328 diag::err_operator_new_delete_declared_static) 9329 << FnDecl->getDeclName(); 9330 } 9331 9332 return false; 9333} 9334 9335static inline bool 9336CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9337 CanQualType ExpectedResultType, 9338 CanQualType ExpectedFirstParamType, 9339 unsigned DependentParamTypeDiag, 9340 unsigned InvalidParamTypeDiag) { 9341 QualType ResultType = 9342 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9343 9344 // Check that the result type is not dependent. 9345 if (ResultType->isDependentType()) 9346 return SemaRef.Diag(FnDecl->getLocation(), 9347 diag::err_operator_new_delete_dependent_result_type) 9348 << FnDecl->getDeclName() << ExpectedResultType; 9349 9350 // Check that the result type is what we expect. 9351 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9352 return SemaRef.Diag(FnDecl->getLocation(), 9353 diag::err_operator_new_delete_invalid_result_type) 9354 << FnDecl->getDeclName() << ExpectedResultType; 9355 9356 // A function template must have at least 2 parameters. 9357 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9358 return SemaRef.Diag(FnDecl->getLocation(), 9359 diag::err_operator_new_delete_template_too_few_parameters) 9360 << FnDecl->getDeclName(); 9361 9362 // The function decl must have at least 1 parameter. 9363 if (FnDecl->getNumParams() == 0) 9364 return SemaRef.Diag(FnDecl->getLocation(), 9365 diag::err_operator_new_delete_too_few_parameters) 9366 << FnDecl->getDeclName(); 9367 9368 // Check the the first parameter type is not dependent. 9369 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9370 if (FirstParamType->isDependentType()) 9371 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9372 << FnDecl->getDeclName() << ExpectedFirstParamType; 9373 9374 // Check that the first parameter type is what we expect. 9375 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9376 ExpectedFirstParamType) 9377 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9378 << FnDecl->getDeclName() << ExpectedFirstParamType; 9379 9380 return false; 9381} 9382 9383static bool 9384CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9385 // C++ [basic.stc.dynamic.allocation]p1: 9386 // A program is ill-formed if an allocation function is 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 CanQualType SizeTy = 9393 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9394 9395 // C++ [basic.stc.dynamic.allocation]p1: 9396 // The return type shall be void*. The first parameter shall have type 9397 // std::size_t. 9398 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9399 SizeTy, 9400 diag::err_operator_new_dependent_param_type, 9401 diag::err_operator_new_param_type)) 9402 return true; 9403 9404 // C++ [basic.stc.dynamic.allocation]p1: 9405 // The first parameter shall not have an associated default argument. 9406 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9407 return SemaRef.Diag(FnDecl->getLocation(), 9408 diag::err_operator_new_default_arg) 9409 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9410 9411 return false; 9412} 9413 9414static bool 9415CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9416 // C++ [basic.stc.dynamic.deallocation]p1: 9417 // A program is ill-formed if deallocation functions are declared in a 9418 // namespace scope other than global scope or declared static in global 9419 // scope. 9420 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9421 return true; 9422 9423 // C++ [basic.stc.dynamic.deallocation]p2: 9424 // Each deallocation function shall return void and its first parameter 9425 // shall be void*. 9426 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9427 SemaRef.Context.VoidPtrTy, 9428 diag::err_operator_delete_dependent_param_type, 9429 diag::err_operator_delete_param_type)) 9430 return true; 9431 9432 return false; 9433} 9434 9435/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9436/// of this overloaded operator is well-formed. If so, returns false; 9437/// otherwise, emits appropriate diagnostics and returns true. 9438bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9439 assert(FnDecl && FnDecl->isOverloadedOperator() && 9440 "Expected an overloaded operator declaration"); 9441 9442 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9443 9444 // C++ [over.oper]p5: 9445 // The allocation and deallocation functions, operator new, 9446 // operator new[], operator delete and operator delete[], are 9447 // described completely in 3.7.3. The attributes and restrictions 9448 // found in the rest of this subclause do not apply to them unless 9449 // explicitly stated in 3.7.3. 9450 if (Op == OO_Delete || Op == OO_Array_Delete) 9451 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9452 9453 if (Op == OO_New || Op == OO_Array_New) 9454 return CheckOperatorNewDeclaration(*this, FnDecl); 9455 9456 // C++ [over.oper]p6: 9457 // An operator function shall either be a non-static member 9458 // function or be a non-member function and have at least one 9459 // parameter whose type is a class, a reference to a class, an 9460 // enumeration, or a reference to an enumeration. 9461 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9462 if (MethodDecl->isStatic()) 9463 return Diag(FnDecl->getLocation(), 9464 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9465 } else { 9466 bool ClassOrEnumParam = false; 9467 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9468 ParamEnd = FnDecl->param_end(); 9469 Param != ParamEnd; ++Param) { 9470 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9471 if (ParamType->isDependentType() || ParamType->isRecordType() || 9472 ParamType->isEnumeralType()) { 9473 ClassOrEnumParam = true; 9474 break; 9475 } 9476 } 9477 9478 if (!ClassOrEnumParam) 9479 return Diag(FnDecl->getLocation(), 9480 diag::err_operator_overload_needs_class_or_enum) 9481 << FnDecl->getDeclName(); 9482 } 9483 9484 // C++ [over.oper]p8: 9485 // An operator function cannot have default arguments (8.3.6), 9486 // except where explicitly stated below. 9487 // 9488 // Only the function-call operator allows default arguments 9489 // (C++ [over.call]p1). 9490 if (Op != OO_Call) { 9491 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9492 Param != FnDecl->param_end(); ++Param) { 9493 if ((*Param)->hasDefaultArg()) 9494 return Diag((*Param)->getLocation(), 9495 diag::err_operator_overload_default_arg) 9496 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9497 } 9498 } 9499 9500 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9501 { false, false, false } 9502#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9503 , { Unary, Binary, MemberOnly } 9504#include "clang/Basic/OperatorKinds.def" 9505 }; 9506 9507 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9508 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9509 bool MustBeMemberOperator = OperatorUses[Op][2]; 9510 9511 // C++ [over.oper]p8: 9512 // [...] Operator functions cannot have more or fewer parameters 9513 // than the number required for the corresponding operator, as 9514 // described in the rest of this subclause. 9515 unsigned NumParams = FnDecl->getNumParams() 9516 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9517 if (Op != OO_Call && 9518 ((NumParams == 1 && !CanBeUnaryOperator) || 9519 (NumParams == 2 && !CanBeBinaryOperator) || 9520 (NumParams < 1) || (NumParams > 2))) { 9521 // We have the wrong number of parameters. 9522 unsigned ErrorKind; 9523 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9524 ErrorKind = 2; // 2 -> unary or binary. 9525 } else if (CanBeUnaryOperator) { 9526 ErrorKind = 0; // 0 -> unary 9527 } else { 9528 assert(CanBeBinaryOperator && 9529 "All non-call overloaded operators are unary or binary!"); 9530 ErrorKind = 1; // 1 -> binary 9531 } 9532 9533 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9534 << FnDecl->getDeclName() << NumParams << ErrorKind; 9535 } 9536 9537 // Overloaded operators other than operator() cannot be variadic. 9538 if (Op != OO_Call && 9539 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9540 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9541 << FnDecl->getDeclName(); 9542 } 9543 9544 // Some operators must be non-static member functions. 9545 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9546 return Diag(FnDecl->getLocation(), 9547 diag::err_operator_overload_must_be_member) 9548 << FnDecl->getDeclName(); 9549 } 9550 9551 // C++ [over.inc]p1: 9552 // The user-defined function called operator++ implements the 9553 // prefix and postfix ++ operator. If this function is a member 9554 // function with no parameters, or a non-member function with one 9555 // parameter of class or enumeration type, it defines the prefix 9556 // increment operator ++ for objects of that type. If the function 9557 // is a member function with one parameter (which shall be of type 9558 // int) or a non-member function with two parameters (the second 9559 // of which shall be of type int), it defines the postfix 9560 // increment operator ++ for objects of that type. 9561 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9562 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9563 bool ParamIsInt = false; 9564 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9565 ParamIsInt = BT->getKind() == BuiltinType::Int; 9566 9567 if (!ParamIsInt) 9568 return Diag(LastParam->getLocation(), 9569 diag::err_operator_overload_post_incdec_must_be_int) 9570 << LastParam->getType() << (Op == OO_MinusMinus); 9571 } 9572 9573 return false; 9574} 9575 9576/// CheckLiteralOperatorDeclaration - Check whether the declaration 9577/// of this literal operator function is well-formed. If so, returns 9578/// false; otherwise, emits appropriate diagnostics and returns true. 9579bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9580 DeclContext *DC = FnDecl->getDeclContext(); 9581 Decl::Kind Kind = DC->getDeclKind(); 9582 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9583 Kind != Decl::LinkageSpec) { 9584 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9585 << FnDecl->getDeclName(); 9586 return true; 9587 } 9588 9589 bool Valid = false; 9590 9591 // template <char...> type operator "" name() is the only valid template 9592 // signature, and the only valid signature with no parameters. 9593 if (FnDecl->param_size() == 0) { 9594 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9595 // Must have only one template parameter 9596 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9597 if (Params->size() == 1) { 9598 NonTypeTemplateParmDecl *PmDecl = 9599 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9600 9601 // The template parameter must be a char parameter pack. 9602 if (PmDecl && PmDecl->isTemplateParameterPack() && 9603 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9604 Valid = true; 9605 } 9606 } 9607 } else { 9608 // Check the first parameter 9609 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9610 9611 QualType T = (*Param)->getType(); 9612 9613 // unsigned long long int, long double, and any character type are allowed 9614 // as the only parameters. 9615 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9616 Context.hasSameType(T, Context.LongDoubleTy) || 9617 Context.hasSameType(T, Context.CharTy) || 9618 Context.hasSameType(T, Context.WCharTy) || 9619 Context.hasSameType(T, Context.Char16Ty) || 9620 Context.hasSameType(T, Context.Char32Ty)) { 9621 if (++Param == FnDecl->param_end()) 9622 Valid = true; 9623 goto FinishedParams; 9624 } 9625 9626 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9627 const PointerType *PT = T->getAs<PointerType>(); 9628 if (!PT) 9629 goto FinishedParams; 9630 T = PT->getPointeeType(); 9631 if (!T.isConstQualified()) 9632 goto FinishedParams; 9633 T = T.getUnqualifiedType(); 9634 9635 // Move on to the second parameter; 9636 ++Param; 9637 9638 // If there is no second parameter, the first must be a const char * 9639 if (Param == FnDecl->param_end()) { 9640 if (Context.hasSameType(T, Context.CharTy)) 9641 Valid = true; 9642 goto FinishedParams; 9643 } 9644 9645 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9646 // are allowed as the first parameter to a two-parameter function 9647 if (!(Context.hasSameType(T, Context.CharTy) || 9648 Context.hasSameType(T, Context.WCharTy) || 9649 Context.hasSameType(T, Context.Char16Ty) || 9650 Context.hasSameType(T, Context.Char32Ty))) 9651 goto FinishedParams; 9652 9653 // The second and final parameter must be an std::size_t 9654 T = (*Param)->getType().getUnqualifiedType(); 9655 if (Context.hasSameType(T, Context.getSizeType()) && 9656 ++Param == FnDecl->param_end()) 9657 Valid = true; 9658 } 9659 9660 // FIXME: This diagnostic is absolutely terrible. 9661FinishedParams: 9662 if (!Valid) { 9663 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9664 << FnDecl->getDeclName(); 9665 return true; 9666 } 9667 9668 StringRef LiteralName 9669 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9670 if (LiteralName[0] != '_') { 9671 // C++0x [usrlit.suffix]p1: 9672 // Literal suffix identifiers that do not start with an underscore are 9673 // reserved for future standardization. 9674 bool IsHexFloat = true; 9675 if (LiteralName.size() > 1 && 9676 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9677 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9678 if (!isdigit(LiteralName[I])) { 9679 IsHexFloat = false; 9680 break; 9681 } 9682 } 9683 } 9684 9685 if (IsHexFloat) 9686 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9687 << LiteralName; 9688 else 9689 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9690 } 9691 9692 return false; 9693} 9694 9695/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9696/// linkage specification, including the language and (if present) 9697/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9698/// the location of the language string literal, which is provided 9699/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9700/// the '{' brace. Otherwise, this linkage specification does not 9701/// have any braces. 9702Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9703 SourceLocation LangLoc, 9704 StringRef Lang, 9705 SourceLocation LBraceLoc) { 9706 LinkageSpecDecl::LanguageIDs Language; 9707 if (Lang == "\"C\"") 9708 Language = LinkageSpecDecl::lang_c; 9709 else if (Lang == "\"C++\"") 9710 Language = LinkageSpecDecl::lang_cxx; 9711 else { 9712 Diag(LangLoc, diag::err_bad_language); 9713 return 0; 9714 } 9715 9716 // FIXME: Add all the various semantics of linkage specifications 9717 9718 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9719 ExternLoc, LangLoc, Language); 9720 CurContext->addDecl(D); 9721 PushDeclContext(S, D); 9722 return D; 9723} 9724 9725/// ActOnFinishLinkageSpecification - Complete the definition of 9726/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9727/// valid, it's the position of the closing '}' brace in a linkage 9728/// specification that uses braces. 9729Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9730 Decl *LinkageSpec, 9731 SourceLocation RBraceLoc) { 9732 if (LinkageSpec) { 9733 if (RBraceLoc.isValid()) { 9734 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9735 LSDecl->setRBraceLoc(RBraceLoc); 9736 } 9737 PopDeclContext(); 9738 } 9739 return LinkageSpec; 9740} 9741 9742/// \brief Perform semantic analysis for the variable declaration that 9743/// occurs within a C++ catch clause, returning the newly-created 9744/// variable. 9745VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9746 TypeSourceInfo *TInfo, 9747 SourceLocation StartLoc, 9748 SourceLocation Loc, 9749 IdentifierInfo *Name) { 9750 bool Invalid = false; 9751 QualType ExDeclType = TInfo->getType(); 9752 9753 // Arrays and functions decay. 9754 if (ExDeclType->isArrayType()) 9755 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9756 else if (ExDeclType->isFunctionType()) 9757 ExDeclType = Context.getPointerType(ExDeclType); 9758 9759 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9760 // The exception-declaration shall not denote a pointer or reference to an 9761 // incomplete type, other than [cv] void*. 9762 // N2844 forbids rvalue references. 9763 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9764 Diag(Loc, diag::err_catch_rvalue_ref); 9765 Invalid = true; 9766 } 9767 9768 QualType BaseType = ExDeclType; 9769 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9770 unsigned DK = diag::err_catch_incomplete; 9771 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9772 BaseType = Ptr->getPointeeType(); 9773 Mode = 1; 9774 DK = diag::err_catch_incomplete_ptr; 9775 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9776 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9777 BaseType = Ref->getPointeeType(); 9778 Mode = 2; 9779 DK = diag::err_catch_incomplete_ref; 9780 } 9781 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9782 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9783 Invalid = true; 9784 9785 if (!Invalid && !ExDeclType->isDependentType() && 9786 RequireNonAbstractType(Loc, ExDeclType, 9787 diag::err_abstract_type_in_decl, 9788 AbstractVariableType)) 9789 Invalid = true; 9790 9791 // Only the non-fragile NeXT runtime currently supports C++ catches 9792 // of ObjC types, and no runtime supports catching ObjC types by value. 9793 if (!Invalid && getLangOptions().ObjC1) { 9794 QualType T = ExDeclType; 9795 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9796 T = RT->getPointeeType(); 9797 9798 if (T->isObjCObjectType()) { 9799 Diag(Loc, diag::err_objc_object_catch); 9800 Invalid = true; 9801 } else if (T->isObjCObjectPointerType()) { 9802 if (!getLangOptions().ObjCNonFragileABI) 9803 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9804 } 9805 } 9806 9807 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9808 ExDeclType, TInfo, SC_None, SC_None); 9809 ExDecl->setExceptionVariable(true); 9810 9811 // In ARC, infer 'retaining' for variables of retainable type. 9812 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9813 Invalid = true; 9814 9815 if (!Invalid && !ExDeclType->isDependentType()) { 9816 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9817 // C++ [except.handle]p16: 9818 // The object declared in an exception-declaration or, if the 9819 // exception-declaration does not specify a name, a temporary (12.2) is 9820 // copy-initialized (8.5) from the exception object. [...] 9821 // The object is destroyed when the handler exits, after the destruction 9822 // of any automatic objects initialized within the handler. 9823 // 9824 // We just pretend to initialize the object with itself, then make sure 9825 // it can be destroyed later. 9826 QualType initType = ExDeclType; 9827 9828 InitializedEntity entity = 9829 InitializedEntity::InitializeVariable(ExDecl); 9830 InitializationKind initKind = 9831 InitializationKind::CreateCopy(Loc, SourceLocation()); 9832 9833 Expr *opaqueValue = 9834 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9835 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9836 ExprResult result = sequence.Perform(*this, entity, initKind, 9837 MultiExprArg(&opaqueValue, 1)); 9838 if (result.isInvalid()) 9839 Invalid = true; 9840 else { 9841 // If the constructor used was non-trivial, set this as the 9842 // "initializer". 9843 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9844 if (!construct->getConstructor()->isTrivial()) { 9845 Expr *init = MaybeCreateExprWithCleanups(construct); 9846 ExDecl->setInit(init); 9847 } 9848 9849 // And make sure it's destructable. 9850 FinalizeVarWithDestructor(ExDecl, recordType); 9851 } 9852 } 9853 } 9854 9855 if (Invalid) 9856 ExDecl->setInvalidDecl(); 9857 9858 return ExDecl; 9859} 9860 9861/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9862/// handler. 9863Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9864 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9865 bool Invalid = D.isInvalidType(); 9866 9867 // Check for unexpanded parameter packs. 9868 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9869 UPPC_ExceptionType)) { 9870 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9871 D.getIdentifierLoc()); 9872 Invalid = true; 9873 } 9874 9875 IdentifierInfo *II = D.getIdentifier(); 9876 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9877 LookupOrdinaryName, 9878 ForRedeclaration)) { 9879 // The scope should be freshly made just for us. There is just no way 9880 // it contains any previous declaration. 9881 assert(!S->isDeclScope(PrevDecl)); 9882 if (PrevDecl->isTemplateParameter()) { 9883 // Maybe we will complain about the shadowed template parameter. 9884 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9885 PrevDecl = 0; 9886 } 9887 } 9888 9889 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9890 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9891 << D.getCXXScopeSpec().getRange(); 9892 Invalid = true; 9893 } 9894 9895 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9896 D.getSourceRange().getBegin(), 9897 D.getIdentifierLoc(), 9898 D.getIdentifier()); 9899 if (Invalid) 9900 ExDecl->setInvalidDecl(); 9901 9902 // Add the exception declaration into this scope. 9903 if (II) 9904 PushOnScopeChains(ExDecl, S); 9905 else 9906 CurContext->addDecl(ExDecl); 9907 9908 ProcessDeclAttributes(S, ExDecl, D); 9909 return ExDecl; 9910} 9911 9912Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9913 Expr *AssertExpr, 9914 Expr *AssertMessageExpr_, 9915 SourceLocation RParenLoc) { 9916 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9917 9918 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9919 // In a static_assert-declaration, the constant-expression shall be a 9920 // constant expression that can be contextually converted to bool. 9921 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9922 if (Converted.isInvalid()) 9923 return 0; 9924 9925 llvm::APSInt Cond; 9926 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9927 PDiag(diag::err_static_assert_expression_is_not_constant), 9928 /*AllowFold=*/false).isInvalid()) 9929 return 0; 9930 9931 if (!Cond) 9932 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9933 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9934 } 9935 9936 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9937 return 0; 9938 9939 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9940 AssertExpr, AssertMessage, RParenLoc); 9941 9942 CurContext->addDecl(Decl); 9943 return Decl; 9944} 9945 9946/// \brief Perform semantic analysis of the given friend type declaration. 9947/// 9948/// \returns A friend declaration that. 9949FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9950 SourceLocation FriendLoc, 9951 TypeSourceInfo *TSInfo) { 9952 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9953 9954 QualType T = TSInfo->getType(); 9955 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9956 9957 // C++03 [class.friend]p2: 9958 // An elaborated-type-specifier shall be used in a friend declaration 9959 // for a class.* 9960 // 9961 // * The class-key of the elaborated-type-specifier is required. 9962 if (!ActiveTemplateInstantiations.empty()) { 9963 // Do not complain about the form of friend template types during 9964 // template instantiation; we will already have complained when the 9965 // template was declared. 9966 } else if (!T->isElaboratedTypeSpecifier()) { 9967 // If we evaluated the type to a record type, suggest putting 9968 // a tag in front. 9969 if (const RecordType *RT = T->getAs<RecordType>()) { 9970 RecordDecl *RD = RT->getDecl(); 9971 9972 std::string InsertionText = std::string(" ") + RD->getKindName(); 9973 9974 Diag(TypeRange.getBegin(), 9975 getLangOptions().CPlusPlus0x ? 9976 diag::warn_cxx98_compat_unelaborated_friend_type : 9977 diag::ext_unelaborated_friend_type) 9978 << (unsigned) RD->getTagKind() 9979 << T 9980 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9981 InsertionText); 9982 } else { 9983 Diag(FriendLoc, 9984 getLangOptions().CPlusPlus0x ? 9985 diag::warn_cxx98_compat_nonclass_type_friend : 9986 diag::ext_nonclass_type_friend) 9987 << T 9988 << SourceRange(FriendLoc, TypeRange.getEnd()); 9989 } 9990 } else if (T->getAs<EnumType>()) { 9991 Diag(FriendLoc, 9992 getLangOptions().CPlusPlus0x ? 9993 diag::warn_cxx98_compat_enum_friend : 9994 diag::ext_enum_friend) 9995 << T 9996 << SourceRange(FriendLoc, TypeRange.getEnd()); 9997 } 9998 9999 // C++0x [class.friend]p3: 10000 // If the type specifier in a friend declaration designates a (possibly 10001 // cv-qualified) class type, that class is declared as a friend; otherwise, 10002 // the friend declaration is ignored. 10003 10004 // FIXME: C++0x has some syntactic restrictions on friend type declarations 10005 // in [class.friend]p3 that we do not implement. 10006 10007 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 10008} 10009 10010/// Handle a friend tag declaration where the scope specifier was 10011/// templated. 10012Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10013 unsigned TagSpec, SourceLocation TagLoc, 10014 CXXScopeSpec &SS, 10015 IdentifierInfo *Name, SourceLocation NameLoc, 10016 AttributeList *Attr, 10017 MultiTemplateParamsArg TempParamLists) { 10018 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10019 10020 bool isExplicitSpecialization = false; 10021 bool Invalid = false; 10022 10023 if (TemplateParameterList *TemplateParams 10024 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10025 TempParamLists.get(), 10026 TempParamLists.size(), 10027 /*friend*/ true, 10028 isExplicitSpecialization, 10029 Invalid)) { 10030 if (TemplateParams->size() > 0) { 10031 // This is a declaration of a class template. 10032 if (Invalid) 10033 return 0; 10034 10035 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10036 SS, Name, NameLoc, Attr, 10037 TemplateParams, AS_public, 10038 /*ModulePrivateLoc=*/SourceLocation(), 10039 TempParamLists.size() - 1, 10040 (TemplateParameterList**) TempParamLists.release()).take(); 10041 } else { 10042 // The "template<>" header is extraneous. 10043 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10044 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10045 isExplicitSpecialization = true; 10046 } 10047 } 10048 10049 if (Invalid) return 0; 10050 10051 bool isAllExplicitSpecializations = true; 10052 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10053 if (TempParamLists.get()[I]->size()) { 10054 isAllExplicitSpecializations = false; 10055 break; 10056 } 10057 } 10058 10059 // FIXME: don't ignore attributes. 10060 10061 // If it's explicit specializations all the way down, just forget 10062 // about the template header and build an appropriate non-templated 10063 // friend. TODO: for source fidelity, remember the headers. 10064 if (isAllExplicitSpecializations) { 10065 if (SS.isEmpty()) { 10066 bool Owned = false; 10067 bool IsDependent = false; 10068 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10069 Attr, AS_public, 10070 /*ModulePrivateLoc=*/SourceLocation(), 10071 MultiTemplateParamsArg(), Owned, IsDependent, 10072 /*ScopedEnumKWLoc=*/SourceLocation(), 10073 /*ScopedEnumUsesClassTag=*/false, 10074 /*UnderlyingType=*/TypeResult()); 10075 } 10076 10077 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10078 ElaboratedTypeKeyword Keyword 10079 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10080 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10081 *Name, NameLoc); 10082 if (T.isNull()) 10083 return 0; 10084 10085 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10086 if (isa<DependentNameType>(T)) { 10087 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10088 TL.setKeywordLoc(TagLoc); 10089 TL.setQualifierLoc(QualifierLoc); 10090 TL.setNameLoc(NameLoc); 10091 } else { 10092 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10093 TL.setKeywordLoc(TagLoc); 10094 TL.setQualifierLoc(QualifierLoc); 10095 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10096 } 10097 10098 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10099 TSI, FriendLoc); 10100 Friend->setAccess(AS_public); 10101 CurContext->addDecl(Friend); 10102 return Friend; 10103 } 10104 10105 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10106 10107 10108 10109 // Handle the case of a templated-scope friend class. e.g. 10110 // template <class T> class A<T>::B; 10111 // FIXME: we don't support these right now. 10112 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10113 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10114 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10115 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10116 TL.setKeywordLoc(TagLoc); 10117 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10118 TL.setNameLoc(NameLoc); 10119 10120 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10121 TSI, FriendLoc); 10122 Friend->setAccess(AS_public); 10123 Friend->setUnsupportedFriend(true); 10124 CurContext->addDecl(Friend); 10125 return Friend; 10126} 10127 10128 10129/// Handle a friend type declaration. This works in tandem with 10130/// ActOnTag. 10131/// 10132/// Notes on friend class templates: 10133/// 10134/// We generally treat friend class declarations as if they were 10135/// declaring a class. So, for example, the elaborated type specifier 10136/// in a friend declaration is required to obey the restrictions of a 10137/// class-head (i.e. no typedefs in the scope chain), template 10138/// parameters are required to match up with simple template-ids, &c. 10139/// However, unlike when declaring a template specialization, it's 10140/// okay to refer to a template specialization without an empty 10141/// template parameter declaration, e.g. 10142/// friend class A<T>::B<unsigned>; 10143/// We permit this as a special case; if there are any template 10144/// parameters present at all, require proper matching, i.e. 10145/// template <> template <class T> friend class A<int>::B; 10146Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10147 MultiTemplateParamsArg TempParams) { 10148 SourceLocation Loc = DS.getSourceRange().getBegin(); 10149 10150 assert(DS.isFriendSpecified()); 10151 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10152 10153 // Try to convert the decl specifier to a type. This works for 10154 // friend templates because ActOnTag never produces a ClassTemplateDecl 10155 // for a TUK_Friend. 10156 Declarator TheDeclarator(DS, Declarator::MemberContext); 10157 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10158 QualType T = TSI->getType(); 10159 if (TheDeclarator.isInvalidType()) 10160 return 0; 10161 10162 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10163 return 0; 10164 10165 // This is definitely an error in C++98. It's probably meant to 10166 // be forbidden in C++0x, too, but the specification is just 10167 // poorly written. 10168 // 10169 // The problem is with declarations like the following: 10170 // template <T> friend A<T>::foo; 10171 // where deciding whether a class C is a friend or not now hinges 10172 // on whether there exists an instantiation of A that causes 10173 // 'foo' to equal C. There are restrictions on class-heads 10174 // (which we declare (by fiat) elaborated friend declarations to 10175 // be) that makes this tractable. 10176 // 10177 // FIXME: handle "template <> friend class A<T>;", which 10178 // is possibly well-formed? Who even knows? 10179 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10180 Diag(Loc, diag::err_tagless_friend_type_template) 10181 << DS.getSourceRange(); 10182 return 0; 10183 } 10184 10185 // C++98 [class.friend]p1: A friend of a class is a function 10186 // or class that is not a member of the class . . . 10187 // This is fixed in DR77, which just barely didn't make the C++03 10188 // deadline. It's also a very silly restriction that seriously 10189 // affects inner classes and which nobody else seems to implement; 10190 // thus we never diagnose it, not even in -pedantic. 10191 // 10192 // But note that we could warn about it: it's always useless to 10193 // friend one of your own members (it's not, however, worthless to 10194 // friend a member of an arbitrary specialization of your template). 10195 10196 Decl *D; 10197 if (unsigned NumTempParamLists = TempParams.size()) 10198 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10199 NumTempParamLists, 10200 TempParams.release(), 10201 TSI, 10202 DS.getFriendSpecLoc()); 10203 else 10204 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10205 10206 if (!D) 10207 return 0; 10208 10209 D->setAccess(AS_public); 10210 CurContext->addDecl(D); 10211 10212 return D; 10213} 10214 10215Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10216 MultiTemplateParamsArg TemplateParams) { 10217 const DeclSpec &DS = D.getDeclSpec(); 10218 10219 assert(DS.isFriendSpecified()); 10220 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10221 10222 SourceLocation Loc = D.getIdentifierLoc(); 10223 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10224 10225 // C++ [class.friend]p1 10226 // A friend of a class is a function or class.... 10227 // Note that this sees through typedefs, which is intended. 10228 // It *doesn't* see through dependent types, which is correct 10229 // according to [temp.arg.type]p3: 10230 // If a declaration acquires a function type through a 10231 // type dependent on a template-parameter and this causes 10232 // a declaration that does not use the syntactic form of a 10233 // function declarator to have a function type, the program 10234 // is ill-formed. 10235 if (!TInfo->getType()->isFunctionType()) { 10236 Diag(Loc, diag::err_unexpected_friend); 10237 10238 // It might be worthwhile to try to recover by creating an 10239 // appropriate declaration. 10240 return 0; 10241 } 10242 10243 // C++ [namespace.memdef]p3 10244 // - If a friend declaration in a non-local class first declares a 10245 // class or function, the friend class or function is a member 10246 // of the innermost enclosing namespace. 10247 // - The name of the friend is not found by simple name lookup 10248 // until a matching declaration is provided in that namespace 10249 // scope (either before or after the class declaration granting 10250 // friendship). 10251 // - If a friend function is called, its name may be found by the 10252 // name lookup that considers functions from namespaces and 10253 // classes associated with the types of the function arguments. 10254 // - When looking for a prior declaration of a class or a function 10255 // declared as a friend, scopes outside the innermost enclosing 10256 // namespace scope are not considered. 10257 10258 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10259 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10260 DeclarationName Name = NameInfo.getName(); 10261 assert(Name); 10262 10263 // Check for unexpanded parameter packs. 10264 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10265 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10266 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10267 return 0; 10268 10269 // The context we found the declaration in, or in which we should 10270 // create the declaration. 10271 DeclContext *DC; 10272 Scope *DCScope = S; 10273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10274 ForRedeclaration); 10275 10276 // FIXME: there are different rules in local classes 10277 10278 // There are four cases here. 10279 // - There's no scope specifier, in which case we just go to the 10280 // appropriate scope and look for a function or function template 10281 // there as appropriate. 10282 // Recover from invalid scope qualifiers as if they just weren't there. 10283 if (SS.isInvalid() || !SS.isSet()) { 10284 // C++0x [namespace.memdef]p3: 10285 // If the name in a friend declaration is neither qualified nor 10286 // a template-id and the declaration is a function or an 10287 // elaborated-type-specifier, the lookup to determine whether 10288 // the entity has been previously declared shall not consider 10289 // any scopes outside the innermost enclosing namespace. 10290 // C++0x [class.friend]p11: 10291 // If a friend declaration appears in a local class and the name 10292 // specified is an unqualified name, a prior declaration is 10293 // looked up without considering scopes that are outside the 10294 // innermost enclosing non-class scope. For a friend function 10295 // declaration, if there is no prior declaration, the program is 10296 // ill-formed. 10297 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10298 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10299 10300 // Find the appropriate context according to the above. 10301 DC = CurContext; 10302 while (true) { 10303 // Skip class contexts. If someone can cite chapter and verse 10304 // for this behavior, that would be nice --- it's what GCC and 10305 // EDG do, and it seems like a reasonable intent, but the spec 10306 // really only says that checks for unqualified existing 10307 // declarations should stop at the nearest enclosing namespace, 10308 // not that they should only consider the nearest enclosing 10309 // namespace. 10310 while (DC->isRecord()) 10311 DC = DC->getParent(); 10312 10313 LookupQualifiedName(Previous, DC); 10314 10315 // TODO: decide what we think about using declarations. 10316 if (isLocal || !Previous.empty()) 10317 break; 10318 10319 if (isTemplateId) { 10320 if (isa<TranslationUnitDecl>(DC)) break; 10321 } else { 10322 if (DC->isFileContext()) break; 10323 } 10324 DC = DC->getParent(); 10325 } 10326 10327 // C++ [class.friend]p1: A friend of a class is a function or 10328 // class that is not a member of the class . . . 10329 // C++11 changes this for both friend types and functions. 10330 // Most C++ 98 compilers do seem to give an error here, so 10331 // we do, too. 10332 if (!Previous.empty() && DC->Equals(CurContext)) 10333 Diag(DS.getFriendSpecLoc(), 10334 getLangOptions().CPlusPlus0x ? 10335 diag::warn_cxx98_compat_friend_is_member : 10336 diag::err_friend_is_member); 10337 10338 DCScope = getScopeForDeclContext(S, DC); 10339 10340 // C++ [class.friend]p6: 10341 // A function can be defined in a friend declaration of a class if and 10342 // only if the class is a non-local class (9.8), the function name is 10343 // unqualified, and the function has namespace scope. 10344 if (isLocal && D.isFunctionDefinition()) { 10345 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10346 } 10347 10348 // - There's a non-dependent scope specifier, in which case we 10349 // compute it and do a previous lookup there for a function 10350 // or function template. 10351 } else if (!SS.getScopeRep()->isDependent()) { 10352 DC = computeDeclContext(SS); 10353 if (!DC) return 0; 10354 10355 if (RequireCompleteDeclContext(SS, DC)) return 0; 10356 10357 LookupQualifiedName(Previous, DC); 10358 10359 // Ignore things found implicitly in the wrong scope. 10360 // TODO: better diagnostics for this case. Suggesting the right 10361 // qualified scope would be nice... 10362 LookupResult::Filter F = Previous.makeFilter(); 10363 while (F.hasNext()) { 10364 NamedDecl *D = F.next(); 10365 if (!DC->InEnclosingNamespaceSetOf( 10366 D->getDeclContext()->getRedeclContext())) 10367 F.erase(); 10368 } 10369 F.done(); 10370 10371 if (Previous.empty()) { 10372 D.setInvalidType(); 10373 Diag(Loc, diag::err_qualified_friend_not_found) 10374 << Name << TInfo->getType(); 10375 return 0; 10376 } 10377 10378 // C++ [class.friend]p1: A friend of a class is a function or 10379 // class that is not a member of the class . . . 10380 if (DC->Equals(CurContext)) 10381 Diag(DS.getFriendSpecLoc(), 10382 getLangOptions().CPlusPlus0x ? 10383 diag::warn_cxx98_compat_friend_is_member : 10384 diag::err_friend_is_member); 10385 10386 if (D.isFunctionDefinition()) { 10387 // C++ [class.friend]p6: 10388 // A function can be defined in a friend declaration of a class if and 10389 // only if the class is a non-local class (9.8), the function name is 10390 // unqualified, and the function has namespace scope. 10391 SemaDiagnosticBuilder DB 10392 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10393 10394 DB << SS.getScopeRep(); 10395 if (DC->isFileContext()) 10396 DB << FixItHint::CreateRemoval(SS.getRange()); 10397 SS.clear(); 10398 } 10399 10400 // - There's a scope specifier that does not match any template 10401 // parameter lists, in which case we use some arbitrary context, 10402 // create a method or method template, and wait for instantiation. 10403 // - There's a scope specifier that does match some template 10404 // parameter lists, which we don't handle right now. 10405 } else { 10406 if (D.isFunctionDefinition()) { 10407 // C++ [class.friend]p6: 10408 // A function can be defined in a friend declaration of a class if and 10409 // only if the class is a non-local class (9.8), the function name is 10410 // unqualified, and the function has namespace scope. 10411 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10412 << SS.getScopeRep(); 10413 } 10414 10415 DC = CurContext; 10416 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10417 } 10418 10419 if (!DC->isRecord()) { 10420 // This implies that it has to be an operator or function. 10421 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10422 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10423 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10424 Diag(Loc, diag::err_introducing_special_friend) << 10425 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10426 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10427 return 0; 10428 } 10429 } 10430 10431 // FIXME: This is an egregious hack to cope with cases where the scope stack 10432 // does not contain the declaration context, i.e., in an out-of-line 10433 // definition of a class. 10434 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10435 if (!DCScope) { 10436 FakeDCScope.setEntity(DC); 10437 DCScope = &FakeDCScope; 10438 } 10439 10440 bool AddToScope = true; 10441 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10442 move(TemplateParams), AddToScope); 10443 if (!ND) return 0; 10444 10445 assert(ND->getDeclContext() == DC); 10446 assert(ND->getLexicalDeclContext() == CurContext); 10447 10448 // Add the function declaration to the appropriate lookup tables, 10449 // adjusting the redeclarations list as necessary. We don't 10450 // want to do this yet if the friending class is dependent. 10451 // 10452 // Also update the scope-based lookup if the target context's 10453 // lookup context is in lexical scope. 10454 if (!CurContext->isDependentContext()) { 10455 DC = DC->getRedeclContext(); 10456 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10457 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10458 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10459 } 10460 10461 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10462 D.getIdentifierLoc(), ND, 10463 DS.getFriendSpecLoc()); 10464 FrD->setAccess(AS_public); 10465 CurContext->addDecl(FrD); 10466 10467 if (ND->isInvalidDecl()) 10468 FrD->setInvalidDecl(); 10469 else { 10470 FunctionDecl *FD; 10471 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10472 FD = FTD->getTemplatedDecl(); 10473 else 10474 FD = cast<FunctionDecl>(ND); 10475 10476 // Mark templated-scope function declarations as unsupported. 10477 if (FD->getNumTemplateParameterLists()) 10478 FrD->setUnsupportedFriend(true); 10479 } 10480 10481 return ND; 10482} 10483 10484void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10485 AdjustDeclIfTemplate(Dcl); 10486 10487 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10488 if (!Fn) { 10489 Diag(DelLoc, diag::err_deleted_non_function); 10490 return; 10491 } 10492 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10493 Diag(DelLoc, diag::err_deleted_decl_not_first); 10494 Diag(Prev->getLocation(), diag::note_previous_declaration); 10495 // If the declaration wasn't the first, we delete the function anyway for 10496 // recovery. 10497 } 10498 Fn->setDeletedAsWritten(); 10499} 10500 10501void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10502 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10503 10504 if (MD) { 10505 if (MD->getParent()->isDependentType()) { 10506 MD->setDefaulted(); 10507 MD->setExplicitlyDefaulted(); 10508 return; 10509 } 10510 10511 CXXSpecialMember Member = getSpecialMember(MD); 10512 if (Member == CXXInvalid) { 10513 Diag(DefaultLoc, diag::err_default_special_members); 10514 return; 10515 } 10516 10517 MD->setDefaulted(); 10518 MD->setExplicitlyDefaulted(); 10519 10520 // If this definition appears within the record, do the checking when 10521 // the record is complete. 10522 const FunctionDecl *Primary = MD; 10523 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10524 // Find the uninstantiated declaration that actually had the '= default' 10525 // on it. 10526 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10527 10528 if (Primary == Primary->getCanonicalDecl()) 10529 return; 10530 10531 switch (Member) { 10532 case CXXDefaultConstructor: { 10533 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10534 CheckExplicitlyDefaultedDefaultConstructor(CD); 10535 if (!CD->isInvalidDecl()) 10536 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10537 break; 10538 } 10539 10540 case CXXCopyConstructor: { 10541 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10542 CheckExplicitlyDefaultedCopyConstructor(CD); 10543 if (!CD->isInvalidDecl()) 10544 DefineImplicitCopyConstructor(DefaultLoc, CD); 10545 break; 10546 } 10547 10548 case CXXCopyAssignment: { 10549 CheckExplicitlyDefaultedCopyAssignment(MD); 10550 if (!MD->isInvalidDecl()) 10551 DefineImplicitCopyAssignment(DefaultLoc, MD); 10552 break; 10553 } 10554 10555 case CXXDestructor: { 10556 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10557 CheckExplicitlyDefaultedDestructor(DD); 10558 if (!DD->isInvalidDecl()) 10559 DefineImplicitDestructor(DefaultLoc, DD); 10560 break; 10561 } 10562 10563 case CXXMoveConstructor: { 10564 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10565 CheckExplicitlyDefaultedMoveConstructor(CD); 10566 if (!CD->isInvalidDecl()) 10567 DefineImplicitMoveConstructor(DefaultLoc, CD); 10568 break; 10569 } 10570 10571 case CXXMoveAssignment: { 10572 CheckExplicitlyDefaultedMoveAssignment(MD); 10573 if (!MD->isInvalidDecl()) 10574 DefineImplicitMoveAssignment(DefaultLoc, MD); 10575 break; 10576 } 10577 10578 case CXXInvalid: 10579 llvm_unreachable("Invalid special member."); 10580 } 10581 } else { 10582 Diag(DefaultLoc, diag::err_default_special_members); 10583 } 10584} 10585 10586static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10587 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10588 Stmt *SubStmt = *CI; 10589 if (!SubStmt) 10590 continue; 10591 if (isa<ReturnStmt>(SubStmt)) 10592 Self.Diag(SubStmt->getSourceRange().getBegin(), 10593 diag::err_return_in_constructor_handler); 10594 if (!isa<Expr>(SubStmt)) 10595 SearchForReturnInStmt(Self, SubStmt); 10596 } 10597} 10598 10599void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10600 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10601 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10602 SearchForReturnInStmt(*this, Handler); 10603 } 10604} 10605 10606bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10607 const CXXMethodDecl *Old) { 10608 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10609 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10610 10611 if (Context.hasSameType(NewTy, OldTy) || 10612 NewTy->isDependentType() || OldTy->isDependentType()) 10613 return false; 10614 10615 // Check if the return types are covariant 10616 QualType NewClassTy, OldClassTy; 10617 10618 /// Both types must be pointers or references to classes. 10619 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10620 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10621 NewClassTy = NewPT->getPointeeType(); 10622 OldClassTy = OldPT->getPointeeType(); 10623 } 10624 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10625 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10626 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10627 NewClassTy = NewRT->getPointeeType(); 10628 OldClassTy = OldRT->getPointeeType(); 10629 } 10630 } 10631 } 10632 10633 // The return types aren't either both pointers or references to a class type. 10634 if (NewClassTy.isNull()) { 10635 Diag(New->getLocation(), 10636 diag::err_different_return_type_for_overriding_virtual_function) 10637 << New->getDeclName() << NewTy << OldTy; 10638 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10639 10640 return true; 10641 } 10642 10643 // C++ [class.virtual]p6: 10644 // If the return type of D::f differs from the return type of B::f, the 10645 // class type in the return type of D::f shall be complete at the point of 10646 // declaration of D::f or shall be the class type D. 10647 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10648 if (!RT->isBeingDefined() && 10649 RequireCompleteType(New->getLocation(), NewClassTy, 10650 PDiag(diag::err_covariant_return_incomplete) 10651 << New->getDeclName())) 10652 return true; 10653 } 10654 10655 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10656 // Check if the new class derives from the old class. 10657 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10658 Diag(New->getLocation(), 10659 diag::err_covariant_return_not_derived) 10660 << New->getDeclName() << NewTy << OldTy; 10661 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10662 return true; 10663 } 10664 10665 // Check if we the conversion from derived to base is valid. 10666 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10667 diag::err_covariant_return_inaccessible_base, 10668 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10669 // FIXME: Should this point to the return type? 10670 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10671 // FIXME: this note won't trigger for delayed access control 10672 // diagnostics, and it's impossible to get an undelayed error 10673 // here from access control during the original parse because 10674 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10675 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10676 return true; 10677 } 10678 } 10679 10680 // The qualifiers of the return types must be the same. 10681 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10682 Diag(New->getLocation(), 10683 diag::err_covariant_return_type_different_qualifications) 10684 << New->getDeclName() << NewTy << OldTy; 10685 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10686 return true; 10687 }; 10688 10689 10690 // The new class type must have the same or less qualifiers as the old type. 10691 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10692 Diag(New->getLocation(), 10693 diag::err_covariant_return_type_class_type_more_qualified) 10694 << New->getDeclName() << NewTy << OldTy; 10695 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10696 return true; 10697 }; 10698 10699 return false; 10700} 10701 10702/// \brief Mark the given method pure. 10703/// 10704/// \param Method the method to be marked pure. 10705/// 10706/// \param InitRange the source range that covers the "0" initializer. 10707bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10708 SourceLocation EndLoc = InitRange.getEnd(); 10709 if (EndLoc.isValid()) 10710 Method->setRangeEnd(EndLoc); 10711 10712 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10713 Method->setPure(); 10714 return false; 10715 } 10716 10717 if (!Method->isInvalidDecl()) 10718 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10719 << Method->getDeclName() << InitRange; 10720 return true; 10721} 10722 10723/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10724/// an initializer for the out-of-line declaration 'Dcl'. The scope 10725/// is a fresh scope pushed for just this purpose. 10726/// 10727/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10728/// static data member of class X, names should be looked up in the scope of 10729/// class X. 10730void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10731 // If there is no declaration, there was an error parsing it. 10732 if (D == 0 || D->isInvalidDecl()) return; 10733 10734 // We should only get called for declarations with scope specifiers, like: 10735 // int foo::bar; 10736 assert(D->isOutOfLine()); 10737 EnterDeclaratorContext(S, D->getDeclContext()); 10738} 10739 10740/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10741/// initializer for the out-of-line declaration 'D'. 10742void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10743 // If there is no declaration, there was an error parsing it. 10744 if (D == 0 || D->isInvalidDecl()) return; 10745 10746 assert(D->isOutOfLine()); 10747 ExitDeclaratorContext(S); 10748} 10749 10750/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10751/// C++ if/switch/while/for statement. 10752/// e.g: "if (int x = f()) {...}" 10753DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10754 // C++ 6.4p2: 10755 // The declarator shall not specify a function or an array. 10756 // The type-specifier-seq shall not contain typedef and shall not declare a 10757 // new class or enumeration. 10758 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10759 "Parser allowed 'typedef' as storage class of condition decl."); 10760 10761 Decl *Dcl = ActOnDeclarator(S, D); 10762 if (!Dcl) 10763 return true; 10764 10765 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10766 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10767 << D.getSourceRange(); 10768 return true; 10769 } 10770 10771 return Dcl; 10772} 10773 10774void Sema::LoadExternalVTableUses() { 10775 if (!ExternalSource) 10776 return; 10777 10778 SmallVector<ExternalVTableUse, 4> VTables; 10779 ExternalSource->ReadUsedVTables(VTables); 10780 SmallVector<VTableUse, 4> NewUses; 10781 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10782 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10783 = VTablesUsed.find(VTables[I].Record); 10784 // Even if a definition wasn't required before, it may be required now. 10785 if (Pos != VTablesUsed.end()) { 10786 if (!Pos->second && VTables[I].DefinitionRequired) 10787 Pos->second = true; 10788 continue; 10789 } 10790 10791 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10792 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10793 } 10794 10795 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10796} 10797 10798void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10799 bool DefinitionRequired) { 10800 // Ignore any vtable uses in unevaluated operands or for classes that do 10801 // not have a vtable. 10802 if (!Class->isDynamicClass() || Class->isDependentContext() || 10803 CurContext->isDependentContext() || 10804 ExprEvalContexts.back().Context == Unevaluated) 10805 return; 10806 10807 // Try to insert this class into the map. 10808 LoadExternalVTableUses(); 10809 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10810 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10811 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10812 if (!Pos.second) { 10813 // If we already had an entry, check to see if we are promoting this vtable 10814 // to required a definition. If so, we need to reappend to the VTableUses 10815 // list, since we may have already processed the first entry. 10816 if (DefinitionRequired && !Pos.first->second) { 10817 Pos.first->second = true; 10818 } else { 10819 // Otherwise, we can early exit. 10820 return; 10821 } 10822 } 10823 10824 // Local classes need to have their virtual members marked 10825 // immediately. For all other classes, we mark their virtual members 10826 // at the end of the translation unit. 10827 if (Class->isLocalClass()) 10828 MarkVirtualMembersReferenced(Loc, Class); 10829 else 10830 VTableUses.push_back(std::make_pair(Class, Loc)); 10831} 10832 10833bool Sema::DefineUsedVTables() { 10834 LoadExternalVTableUses(); 10835 if (VTableUses.empty()) 10836 return false; 10837 10838 // Note: The VTableUses vector could grow as a result of marking 10839 // the members of a class as "used", so we check the size each 10840 // time through the loop and prefer indices (with are stable) to 10841 // iterators (which are not). 10842 bool DefinedAnything = false; 10843 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10844 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10845 if (!Class) 10846 continue; 10847 10848 SourceLocation Loc = VTableUses[I].second; 10849 10850 // If this class has a key function, but that key function is 10851 // defined in another translation unit, we don't need to emit the 10852 // vtable even though we're using it. 10853 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10854 if (KeyFunction && !KeyFunction->hasBody()) { 10855 switch (KeyFunction->getTemplateSpecializationKind()) { 10856 case TSK_Undeclared: 10857 case TSK_ExplicitSpecialization: 10858 case TSK_ExplicitInstantiationDeclaration: 10859 // The key function is in another translation unit. 10860 continue; 10861 10862 case TSK_ExplicitInstantiationDefinition: 10863 case TSK_ImplicitInstantiation: 10864 // We will be instantiating the key function. 10865 break; 10866 } 10867 } else if (!KeyFunction) { 10868 // If we have a class with no key function that is the subject 10869 // of an explicit instantiation declaration, suppress the 10870 // vtable; it will live with the explicit instantiation 10871 // definition. 10872 bool IsExplicitInstantiationDeclaration 10873 = Class->getTemplateSpecializationKind() 10874 == TSK_ExplicitInstantiationDeclaration; 10875 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10876 REnd = Class->redecls_end(); 10877 R != REnd; ++R) { 10878 TemplateSpecializationKind TSK 10879 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10880 if (TSK == TSK_ExplicitInstantiationDeclaration) 10881 IsExplicitInstantiationDeclaration = true; 10882 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10883 IsExplicitInstantiationDeclaration = false; 10884 break; 10885 } 10886 } 10887 10888 if (IsExplicitInstantiationDeclaration) 10889 continue; 10890 } 10891 10892 // Mark all of the virtual members of this class as referenced, so 10893 // that we can build a vtable. Then, tell the AST consumer that a 10894 // vtable for this class is required. 10895 DefinedAnything = true; 10896 MarkVirtualMembersReferenced(Loc, Class); 10897 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10898 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10899 10900 // Optionally warn if we're emitting a weak vtable. 10901 if (Class->getLinkage() == ExternalLinkage && 10902 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10903 const FunctionDecl *KeyFunctionDef = 0; 10904 if (!KeyFunction || 10905 (KeyFunction->hasBody(KeyFunctionDef) && 10906 KeyFunctionDef->isInlined())) 10907 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10908 TSK_ExplicitInstantiationDefinition 10909 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10910 << Class; 10911 } 10912 } 10913 VTableUses.clear(); 10914 10915 return DefinedAnything; 10916} 10917 10918void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10919 const CXXRecordDecl *RD) { 10920 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10921 e = RD->method_end(); i != e; ++i) { 10922 CXXMethodDecl *MD = *i; 10923 10924 // C++ [basic.def.odr]p2: 10925 // [...] A virtual member function is used if it is not pure. [...] 10926 if (MD->isVirtual() && !MD->isPure()) 10927 MarkFunctionReferenced(Loc, MD); 10928 } 10929 10930 // Only classes that have virtual bases need a VTT. 10931 if (RD->getNumVBases() == 0) 10932 return; 10933 10934 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10935 e = RD->bases_end(); i != e; ++i) { 10936 const CXXRecordDecl *Base = 10937 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10938 if (Base->getNumVBases() == 0) 10939 continue; 10940 MarkVirtualMembersReferenced(Loc, Base); 10941 } 10942} 10943 10944/// SetIvarInitializers - This routine builds initialization ASTs for the 10945/// Objective-C implementation whose ivars need be initialized. 10946void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10947 if (!getLangOptions().CPlusPlus) 10948 return; 10949 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10950 SmallVector<ObjCIvarDecl*, 8> ivars; 10951 CollectIvarsToConstructOrDestruct(OID, ivars); 10952 if (ivars.empty()) 10953 return; 10954 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10955 for (unsigned i = 0; i < ivars.size(); i++) { 10956 FieldDecl *Field = ivars[i]; 10957 if (Field->isInvalidDecl()) 10958 continue; 10959 10960 CXXCtorInitializer *Member; 10961 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10962 InitializationKind InitKind = 10963 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10964 10965 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10966 ExprResult MemberInit = 10967 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10968 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10969 // Note, MemberInit could actually come back empty if no initialization 10970 // is required (e.g., because it would call a trivial default constructor) 10971 if (!MemberInit.get() || MemberInit.isInvalid()) 10972 continue; 10973 10974 Member = 10975 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10976 SourceLocation(), 10977 MemberInit.takeAs<Expr>(), 10978 SourceLocation()); 10979 AllToInit.push_back(Member); 10980 10981 // Be sure that the destructor is accessible and is marked as referenced. 10982 if (const RecordType *RecordTy 10983 = Context.getBaseElementType(Field->getType()) 10984 ->getAs<RecordType>()) { 10985 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10986 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10987 MarkFunctionReferenced(Field->getLocation(), Destructor); 10988 CheckDestructorAccess(Field->getLocation(), Destructor, 10989 PDiag(diag::err_access_dtor_ivar) 10990 << Context.getBaseElementType(Field->getType())); 10991 } 10992 } 10993 } 10994 ObjCImplementation->setIvarInitializers(Context, 10995 AllToInit.data(), AllToInit.size()); 10996 } 10997} 10998 10999static 11000void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11001 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11002 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11003 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11004 Sema &S) { 11005 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11006 CE = Current.end(); 11007 if (Ctor->isInvalidDecl()) 11008 return; 11009 11010 const FunctionDecl *FNTarget = 0; 11011 CXXConstructorDecl *Target; 11012 11013 // We ignore the result here since if we don't have a body, Target will be 11014 // null below. 11015 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 11016 Target 11017= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 11018 11019 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11020 // Avoid dereferencing a null pointer here. 11021 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11022 11023 if (!Current.insert(Canonical)) 11024 return; 11025 11026 // We know that beyond here, we aren't chaining into a cycle. 11027 if (!Target || !Target->isDelegatingConstructor() || 11028 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11029 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11030 Valid.insert(*CI); 11031 Current.clear(); 11032 // We've hit a cycle. 11033 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11034 Current.count(TCanonical)) { 11035 // If we haven't diagnosed this cycle yet, do so now. 11036 if (!Invalid.count(TCanonical)) { 11037 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11038 diag::warn_delegating_ctor_cycle) 11039 << Ctor; 11040 11041 // Don't add a note for a function delegating directo to itself. 11042 if (TCanonical != Canonical) 11043 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11044 11045 CXXConstructorDecl *C = Target; 11046 while (C->getCanonicalDecl() != Canonical) { 11047 (void)C->getTargetConstructor()->hasBody(FNTarget); 11048 assert(FNTarget && "Ctor cycle through bodiless function"); 11049 11050 C 11051 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11052 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11053 } 11054 } 11055 11056 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11057 Invalid.insert(*CI); 11058 Current.clear(); 11059 } else { 11060 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11061 } 11062} 11063 11064 11065void Sema::CheckDelegatingCtorCycles() { 11066 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11067 11068 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11069 CE = Current.end(); 11070 11071 for (DelegatingCtorDeclsType::iterator 11072 I = DelegatingCtorDecls.begin(ExternalSource), 11073 E = DelegatingCtorDecls.end(); 11074 I != E; ++I) { 11075 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11076 } 11077 11078 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11079 (*CI)->setInvalidDecl(); 11080} 11081 11082/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11083Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11084 // Implicitly declared functions (e.g. copy constructors) are 11085 // __host__ __device__ 11086 if (D->isImplicit()) 11087 return CFT_HostDevice; 11088 11089 if (D->hasAttr<CUDAGlobalAttr>()) 11090 return CFT_Global; 11091 11092 if (D->hasAttr<CUDADeviceAttr>()) { 11093 if (D->hasAttr<CUDAHostAttr>()) 11094 return CFT_HostDevice; 11095 else 11096 return CFT_Device; 11097 } 11098 11099 return CFT_Host; 11100} 11101 11102bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11103 CUDAFunctionTarget CalleeTarget) { 11104 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11105 // Callable from the device only." 11106 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11107 return true; 11108 11109 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11110 // Callable from the host only." 11111 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11112 // Callable from the host only." 11113 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11114 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11115 return true; 11116 11117 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11118 return true; 11119 11120 return false; 11121} 11122