SemaDeclCXX.cpp revision 62b7cfb73e202051e7ab0dad42ba213acd0dec7e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDecl(); 424 Older; Older = Older->getPreviousDecl()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++11 [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 663 if (MD && MD->isInstance()) { 664 // C++11 [dcl.constexpr]p4: In the definition of a constexpr constructor... 665 // In addition, either its function-body shall be = delete or = default or 666 // it shall satisfy the following constraints: 667 // - the class shall not have any virtual base classes; 668 // 669 // We apply this to constexpr member functions too: the class cannot be a 670 // literal type, so the members are not permitted to be constexpr. 671 const CXXRecordDecl *RD = MD->getParent(); 672 if (RD->getNumVBases()) { 673 // Note, this is still illegal if the body is = default, since the 674 // implicit body does not satisfy the requirements of a constexpr 675 // constructor. We also reject cases where the body is = delete, as 676 // required by N3308. 677 if (CCK != CCK_Instantiation) { 678 Diag(NewFD->getLocation(), 679 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 680 : diag::note_constexpr_tmpl_virtual_base) 681 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 682 << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } 691 692 if (!isa<CXXConstructorDecl>(NewFD)) { 693 // C++11 [dcl.constexpr]p3: 694 // The definition of a constexpr function shall satisfy the following 695 // constraints: 696 // - it shall not be virtual; 697 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 698 if (Method && Method->isVirtual()) { 699 if (CCK != CCK_Instantiation) { 700 Diag(NewFD->getLocation(), 701 CCK == CCK_Declaration ? diag::err_constexpr_virtual 702 : diag::note_constexpr_tmpl_virtual); 703 704 // If it's not obvious why this function is virtual, find an overridden 705 // function which uses the 'virtual' keyword. 706 const CXXMethodDecl *WrittenVirtual = Method; 707 while (!WrittenVirtual->isVirtualAsWritten()) 708 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 709 if (WrittenVirtual != Method) 710 Diag(WrittenVirtual->getLocation(), 711 diag::note_overridden_virtual_function); 712 } 713 return false; 714 } 715 716 // - its return type shall be a literal type; 717 QualType RT = NewFD->getResultType(); 718 if (!RT->isDependentType() && 719 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 720 PDiag(diag::err_constexpr_non_literal_return) : 721 PDiag(), 722 /*AllowIncompleteType*/ true)) { 723 if (CCK == CCK_NoteNonConstexprInstantiation) 724 Diag(NewFD->getLocation(), 725 diag::note_constexpr_tmpl_non_literal_return) << RT; 726 return false; 727 } 728 } 729 730 // - each of its parameter types shall be a literal type; 731 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 732 return false; 733 734 return true; 735} 736 737/// Check the given declaration statement is legal within a constexpr function 738/// body. C++0x [dcl.constexpr]p3,p4. 739/// 740/// \return true if the body is OK, false if we have diagnosed a problem. 741static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 742 DeclStmt *DS) { 743 // C++0x [dcl.constexpr]p3 and p4: 744 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 745 // contain only 746 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 747 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 748 switch ((*DclIt)->getKind()) { 749 case Decl::StaticAssert: 750 case Decl::Using: 751 case Decl::UsingShadow: 752 case Decl::UsingDirective: 753 case Decl::UnresolvedUsingTypename: 754 // - static_assert-declarations 755 // - using-declarations, 756 // - using-directives, 757 continue; 758 759 case Decl::Typedef: 760 case Decl::TypeAlias: { 761 // - typedef declarations and alias-declarations that do not define 762 // classes or enumerations, 763 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 764 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 765 // Don't allow variably-modified types in constexpr functions. 766 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 767 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 768 << TL.getSourceRange() << TL.getType() 769 << isa<CXXConstructorDecl>(Dcl); 770 return false; 771 } 772 continue; 773 } 774 775 case Decl::Enum: 776 case Decl::CXXRecord: 777 // As an extension, we allow the declaration (but not the definition) of 778 // classes and enumerations in all declarations, not just in typedef and 779 // alias declarations. 780 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 781 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 782 << isa<CXXConstructorDecl>(Dcl); 783 return false; 784 } 785 continue; 786 787 case Decl::Var: 788 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 789 << isa<CXXConstructorDecl>(Dcl); 790 return false; 791 792 default: 793 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 794 << isa<CXXConstructorDecl>(Dcl); 795 return false; 796 } 797 } 798 799 return true; 800} 801 802/// Check that the given field is initialized within a constexpr constructor. 803/// 804/// \param Dcl The constexpr constructor being checked. 805/// \param Field The field being checked. This may be a member of an anonymous 806/// struct or union nested within the class being checked. 807/// \param Inits All declarations, including anonymous struct/union members and 808/// indirect members, for which any initialization was provided. 809/// \param Diagnosed Set to true if an error is produced. 810static void CheckConstexprCtorInitializer(Sema &SemaRef, 811 const FunctionDecl *Dcl, 812 FieldDecl *Field, 813 llvm::SmallSet<Decl*, 16> &Inits, 814 bool &Diagnosed) { 815 if (Field->isUnnamedBitfield()) 816 return; 817 818 if (!Inits.count(Field)) { 819 if (!Diagnosed) { 820 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 821 Diagnosed = true; 822 } 823 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 824 } else if (Field->isAnonymousStructOrUnion()) { 825 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 826 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 827 I != E; ++I) 828 // If an anonymous union contains an anonymous struct of which any member 829 // is initialized, all members must be initialized. 830 if (!RD->isUnion() || Inits.count(*I)) 831 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 832 } 833} 834 835/// Check the body for the given constexpr function declaration only contains 836/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 837/// 838/// \return true if the body is OK, false if we have diagnosed a problem. 839bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 840 if (isa<CXXTryStmt>(Body)) { 841 // C++0x [dcl.constexpr]p3: 842 // The definition of a constexpr function shall satisfy the following 843 // constraints: [...] 844 // - its function-body shall be = delete, = default, or a 845 // compound-statement 846 // 847 // C++0x [dcl.constexpr]p4: 848 // In the definition of a constexpr constructor, [...] 849 // - its function-body shall not be a function-try-block; 850 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 851 << isa<CXXConstructorDecl>(Dcl); 852 return false; 853 } 854 855 // - its function-body shall be [...] a compound-statement that contains only 856 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 857 858 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 859 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 860 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 861 switch ((*BodyIt)->getStmtClass()) { 862 case Stmt::NullStmtClass: 863 // - null statements, 864 continue; 865 866 case Stmt::DeclStmtClass: 867 // - static_assert-declarations 868 // - using-declarations, 869 // - using-directives, 870 // - typedef declarations and alias-declarations that do not define 871 // classes or enumerations, 872 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 873 return false; 874 continue; 875 876 case Stmt::ReturnStmtClass: 877 // - and exactly one return statement; 878 if (isa<CXXConstructorDecl>(Dcl)) 879 break; 880 881 ReturnStmts.push_back((*BodyIt)->getLocStart()); 882 // FIXME 883 // - every constructor call and implicit conversion used in initializing 884 // the return value shall be one of those allowed in a constant 885 // expression. 886 // Deal with this as part of a general check that the function can produce 887 // a constant expression (for [dcl.constexpr]p5). 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // - every non-static data member and base class sub-object shall be 903 // initialized; 904 if (RD->isUnion()) { 905 // DR1359: Exactly one member of a union shall be initialized. 906 if (Constructor->getNumCtorInitializers() == 0) { 907 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 908 return false; 909 } 910 } else if (!Constructor->isDependentContext() && 911 !Constructor->isDelegatingConstructor()) { 912 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 913 914 // Skip detailed checking if we have enough initializers, and we would 915 // allow at most one initializer per member. 916 bool AnyAnonStructUnionMembers = false; 917 unsigned Fields = 0; 918 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 919 E = RD->field_end(); I != E; ++I, ++Fields) { 920 if ((*I)->isAnonymousStructOrUnion()) { 921 AnyAnonStructUnionMembers = true; 922 break; 923 } 924 } 925 if (AnyAnonStructUnionMembers || 926 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 927 // Check initialization of non-static data members. Base classes are 928 // always initialized so do not need to be checked. Dependent bases 929 // might not have initializers in the member initializer list. 930 llvm::SmallSet<Decl*, 16> Inits; 931 for (CXXConstructorDecl::init_const_iterator 932 I = Constructor->init_begin(), E = Constructor->init_end(); 933 I != E; ++I) { 934 if (FieldDecl *FD = (*I)->getMember()) 935 Inits.insert(FD); 936 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 937 Inits.insert(ID->chain_begin(), ID->chain_end()); 938 } 939 940 bool Diagnosed = false; 941 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 942 E = RD->field_end(); I != E; ++I) 943 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 944 if (Diagnosed) 945 return false; 946 } 947 } 948 949 // FIXME 950 // - every constructor involved in initializing non-static data members 951 // and base class sub-objects shall be a constexpr constructor; 952 // - every assignment-expression that is an initializer-clause appearing 953 // directly or indirectly within a brace-or-equal-initializer for 954 // a non-static data member that is not named by a mem-initializer-id 955 // shall be a constant expression; and 956 // - every implicit conversion used in converting a constructor argument 957 // to the corresponding parameter type and converting 958 // a full-expression to the corresponding member type shall be one of 959 // those allowed in a constant expression. 960 // Deal with these as part of a general check that the function can produce 961 // a constant expression (for [dcl.constexpr]p5). 962 } else { 963 if (ReturnStmts.empty()) { 964 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 965 return false; 966 } 967 if (ReturnStmts.size() > 1) { 968 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 969 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 970 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 971 return false; 972 } 973 } 974 975 return true; 976} 977 978/// isCurrentClassName - Determine whether the identifier II is the 979/// name of the class type currently being defined. In the case of 980/// nested classes, this will only return true if II is the name of 981/// the innermost class. 982bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 983 const CXXScopeSpec *SS) { 984 assert(getLangOptions().CPlusPlus && "No class names in C!"); 985 986 CXXRecordDecl *CurDecl; 987 if (SS && SS->isSet() && !SS->isInvalid()) { 988 DeclContext *DC = computeDeclContext(*SS, true); 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 990 } else 991 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 992 993 if (CurDecl && CurDecl->getIdentifier()) 994 return &II == CurDecl->getIdentifier(); 995 else 996 return false; 997} 998 999/// \brief Check the validity of a C++ base class specifier. 1000/// 1001/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1002/// and returns NULL otherwise. 1003CXXBaseSpecifier * 1004Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1005 SourceRange SpecifierRange, 1006 bool Virtual, AccessSpecifier Access, 1007 TypeSourceInfo *TInfo, 1008 SourceLocation EllipsisLoc) { 1009 QualType BaseType = TInfo->getType(); 1010 1011 // C++ [class.union]p1: 1012 // A union shall not have base classes. 1013 if (Class->isUnion()) { 1014 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1015 << SpecifierRange; 1016 return 0; 1017 } 1018 1019 if (EllipsisLoc.isValid() && 1020 !TInfo->getType()->containsUnexpandedParameterPack()) { 1021 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1022 << TInfo->getTypeLoc().getSourceRange(); 1023 EllipsisLoc = SourceLocation(); 1024 } 1025 1026 if (BaseType->isDependentType()) 1027 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1028 Class->getTagKind() == TTK_Class, 1029 Access, TInfo, EllipsisLoc); 1030 1031 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1032 1033 // Base specifiers must be record types. 1034 if (!BaseType->isRecordType()) { 1035 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1036 return 0; 1037 } 1038 1039 // C++ [class.union]p1: 1040 // A union shall not be used as a base class. 1041 if (BaseType->isUnionType()) { 1042 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1043 return 0; 1044 } 1045 1046 // C++ [class.derived]p2: 1047 // The class-name in a base-specifier shall not be an incompletely 1048 // defined class. 1049 if (RequireCompleteType(BaseLoc, BaseType, 1050 PDiag(diag::err_incomplete_base_class) 1051 << SpecifierRange)) { 1052 Class->setInvalidDecl(); 1053 return 0; 1054 } 1055 1056 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1057 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1058 assert(BaseDecl && "Record type has no declaration"); 1059 BaseDecl = BaseDecl->getDefinition(); 1060 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1061 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1062 assert(CXXBaseDecl && "Base type is not a C++ type"); 1063 1064 // C++ [class]p3: 1065 // If a class is marked final and it appears as a base-type-specifier in 1066 // base-clause, the program is ill-formed. 1067 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1068 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1069 << CXXBaseDecl->getDeclName(); 1070 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1071 << CXXBaseDecl->getDeclName(); 1072 return 0; 1073 } 1074 1075 if (BaseDecl->isInvalidDecl()) 1076 Class->setInvalidDecl(); 1077 1078 // Create the base specifier. 1079 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1080 Class->getTagKind() == TTK_Class, 1081 Access, TInfo, EllipsisLoc); 1082} 1083 1084/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1085/// one entry in the base class list of a class specifier, for 1086/// example: 1087/// class foo : public bar, virtual private baz { 1088/// 'public bar' and 'virtual private baz' are each base-specifiers. 1089BaseResult 1090Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1091 bool Virtual, AccessSpecifier Access, 1092 ParsedType basetype, SourceLocation BaseLoc, 1093 SourceLocation EllipsisLoc) { 1094 if (!classdecl) 1095 return true; 1096 1097 AdjustDeclIfTemplate(classdecl); 1098 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1099 if (!Class) 1100 return true; 1101 1102 TypeSourceInfo *TInfo = 0; 1103 GetTypeFromParser(basetype, &TInfo); 1104 1105 if (EllipsisLoc.isInvalid() && 1106 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1107 UPPC_BaseType)) 1108 return true; 1109 1110 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1111 Virtual, Access, TInfo, 1112 EllipsisLoc)) 1113 return BaseSpec; 1114 1115 return true; 1116} 1117 1118/// \brief Performs the actual work of attaching the given base class 1119/// specifiers to a C++ class. 1120bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1121 unsigned NumBases) { 1122 if (NumBases == 0) 1123 return false; 1124 1125 // Used to keep track of which base types we have already seen, so 1126 // that we can properly diagnose redundant direct base types. Note 1127 // that the key is always the unqualified canonical type of the base 1128 // class. 1129 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1130 1131 // Copy non-redundant base specifiers into permanent storage. 1132 unsigned NumGoodBases = 0; 1133 bool Invalid = false; 1134 for (unsigned idx = 0; idx < NumBases; ++idx) { 1135 QualType NewBaseType 1136 = Context.getCanonicalType(Bases[idx]->getType()); 1137 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1138 if (KnownBaseTypes[NewBaseType]) { 1139 // C++ [class.mi]p3: 1140 // A class shall not be specified as a direct base class of a 1141 // derived class more than once. 1142 Diag(Bases[idx]->getSourceRange().getBegin(), 1143 diag::err_duplicate_base_class) 1144 << KnownBaseTypes[NewBaseType]->getType() 1145 << Bases[idx]->getSourceRange(); 1146 1147 // Delete the duplicate base class specifier; we're going to 1148 // overwrite its pointer later. 1149 Context.Deallocate(Bases[idx]); 1150 1151 Invalid = true; 1152 } else { 1153 // Okay, add this new base class. 1154 KnownBaseTypes[NewBaseType] = Bases[idx]; 1155 Bases[NumGoodBases++] = Bases[idx]; 1156 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1157 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1158 if (RD->hasAttr<WeakAttr>()) 1159 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1160 } 1161 } 1162 1163 // Attach the remaining base class specifiers to the derived class. 1164 Class->setBases(Bases, NumGoodBases); 1165 1166 // Delete the remaining (good) base class specifiers, since their 1167 // data has been copied into the CXXRecordDecl. 1168 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1169 Context.Deallocate(Bases[idx]); 1170 1171 return Invalid; 1172} 1173 1174/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1175/// class, after checking whether there are any duplicate base 1176/// classes. 1177void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1178 unsigned NumBases) { 1179 if (!ClassDecl || !Bases || !NumBases) 1180 return; 1181 1182 AdjustDeclIfTemplate(ClassDecl); 1183 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1184 (CXXBaseSpecifier**)(Bases), NumBases); 1185} 1186 1187static CXXRecordDecl *GetClassForType(QualType T) { 1188 if (const RecordType *RT = T->getAs<RecordType>()) 1189 return cast<CXXRecordDecl>(RT->getDecl()); 1190 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1191 return ICT->getDecl(); 1192 else 1193 return 0; 1194} 1195 1196/// \brief Determine whether the type \p Derived is a C++ class that is 1197/// derived from the type \p Base. 1198bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1199 if (!getLangOptions().CPlusPlus) 1200 return false; 1201 1202 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1203 if (!DerivedRD) 1204 return false; 1205 1206 CXXRecordDecl *BaseRD = GetClassForType(Base); 1207 if (!BaseRD) 1208 return false; 1209 1210 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1211 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1212} 1213 1214/// \brief Determine whether the type \p Derived is a C++ class that is 1215/// derived from the type \p Base. 1216bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1217 if (!getLangOptions().CPlusPlus) 1218 return false; 1219 1220 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1221 if (!DerivedRD) 1222 return false; 1223 1224 CXXRecordDecl *BaseRD = GetClassForType(Base); 1225 if (!BaseRD) 1226 return false; 1227 1228 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1229} 1230 1231void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1232 CXXCastPath &BasePathArray) { 1233 assert(BasePathArray.empty() && "Base path array must be empty!"); 1234 assert(Paths.isRecordingPaths() && "Must record paths!"); 1235 1236 const CXXBasePath &Path = Paths.front(); 1237 1238 // We first go backward and check if we have a virtual base. 1239 // FIXME: It would be better if CXXBasePath had the base specifier for 1240 // the nearest virtual base. 1241 unsigned Start = 0; 1242 for (unsigned I = Path.size(); I != 0; --I) { 1243 if (Path[I - 1].Base->isVirtual()) { 1244 Start = I - 1; 1245 break; 1246 } 1247 } 1248 1249 // Now add all bases. 1250 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1251 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1252} 1253 1254/// \brief Determine whether the given base path includes a virtual 1255/// base class. 1256bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1257 for (CXXCastPath::const_iterator B = BasePath.begin(), 1258 BEnd = BasePath.end(); 1259 B != BEnd; ++B) 1260 if ((*B)->isVirtual()) 1261 return true; 1262 1263 return false; 1264} 1265 1266/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1267/// conversion (where Derived and Base are class types) is 1268/// well-formed, meaning that the conversion is unambiguous (and 1269/// that all of the base classes are accessible). Returns true 1270/// and emits a diagnostic if the code is ill-formed, returns false 1271/// otherwise. Loc is the location where this routine should point to 1272/// if there is an error, and Range is the source range to highlight 1273/// if there is an error. 1274bool 1275Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1276 unsigned InaccessibleBaseID, 1277 unsigned AmbigiousBaseConvID, 1278 SourceLocation Loc, SourceRange Range, 1279 DeclarationName Name, 1280 CXXCastPath *BasePath) { 1281 // First, determine whether the path from Derived to Base is 1282 // ambiguous. This is slightly more expensive than checking whether 1283 // the Derived to Base conversion exists, because here we need to 1284 // explore multiple paths to determine if there is an ambiguity. 1285 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1286 /*DetectVirtual=*/false); 1287 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1288 assert(DerivationOkay && 1289 "Can only be used with a derived-to-base conversion"); 1290 (void)DerivationOkay; 1291 1292 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1293 if (InaccessibleBaseID) { 1294 // Check that the base class can be accessed. 1295 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1296 InaccessibleBaseID)) { 1297 case AR_inaccessible: 1298 return true; 1299 case AR_accessible: 1300 case AR_dependent: 1301 case AR_delayed: 1302 break; 1303 } 1304 } 1305 1306 // Build a base path if necessary. 1307 if (BasePath) 1308 BuildBasePathArray(Paths, *BasePath); 1309 return false; 1310 } 1311 1312 // We know that the derived-to-base conversion is ambiguous, and 1313 // we're going to produce a diagnostic. Perform the derived-to-base 1314 // search just one more time to compute all of the possible paths so 1315 // that we can print them out. This is more expensive than any of 1316 // the previous derived-to-base checks we've done, but at this point 1317 // performance isn't as much of an issue. 1318 Paths.clear(); 1319 Paths.setRecordingPaths(true); 1320 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1321 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1322 (void)StillOkay; 1323 1324 // Build up a textual representation of the ambiguous paths, e.g., 1325 // D -> B -> A, that will be used to illustrate the ambiguous 1326 // conversions in the diagnostic. We only print one of the paths 1327 // to each base class subobject. 1328 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1329 1330 Diag(Loc, AmbigiousBaseConvID) 1331 << Derived << Base << PathDisplayStr << Range << Name; 1332 return true; 1333} 1334 1335bool 1336Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1337 SourceLocation Loc, SourceRange Range, 1338 CXXCastPath *BasePath, 1339 bool IgnoreAccess) { 1340 return CheckDerivedToBaseConversion(Derived, Base, 1341 IgnoreAccess ? 0 1342 : diag::err_upcast_to_inaccessible_base, 1343 diag::err_ambiguous_derived_to_base_conv, 1344 Loc, Range, DeclarationName(), 1345 BasePath); 1346} 1347 1348 1349/// @brief Builds a string representing ambiguous paths from a 1350/// specific derived class to different subobjects of the same base 1351/// class. 1352/// 1353/// This function builds a string that can be used in error messages 1354/// to show the different paths that one can take through the 1355/// inheritance hierarchy to go from the derived class to different 1356/// subobjects of a base class. The result looks something like this: 1357/// @code 1358/// struct D -> struct B -> struct A 1359/// struct D -> struct C -> struct A 1360/// @endcode 1361std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1362 std::string PathDisplayStr; 1363 std::set<unsigned> DisplayedPaths; 1364 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1365 Path != Paths.end(); ++Path) { 1366 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1367 // We haven't displayed a path to this particular base 1368 // class subobject yet. 1369 PathDisplayStr += "\n "; 1370 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1371 for (CXXBasePath::const_iterator Element = Path->begin(); 1372 Element != Path->end(); ++Element) 1373 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1374 } 1375 } 1376 1377 return PathDisplayStr; 1378} 1379 1380//===----------------------------------------------------------------------===// 1381// C++ class member Handling 1382//===----------------------------------------------------------------------===// 1383 1384/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1385bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1386 SourceLocation ASLoc, 1387 SourceLocation ColonLoc, 1388 AttributeList *Attrs) { 1389 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1390 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1391 ASLoc, ColonLoc); 1392 CurContext->addHiddenDecl(ASDecl); 1393 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1394} 1395 1396/// CheckOverrideControl - Check C++0x override control semantics. 1397void Sema::CheckOverrideControl(const Decl *D) { 1398 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1399 if (!MD || !MD->isVirtual()) 1400 return; 1401 1402 if (MD->isDependentContext()) 1403 return; 1404 1405 // C++0x [class.virtual]p3: 1406 // If a virtual function is marked with the virt-specifier override and does 1407 // not override a member function of a base class, 1408 // the program is ill-formed. 1409 bool HasOverriddenMethods = 1410 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1411 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1412 Diag(MD->getLocation(), 1413 diag::err_function_marked_override_not_overriding) 1414 << MD->getDeclName(); 1415 return; 1416 } 1417} 1418 1419/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1420/// function overrides a virtual member function marked 'final', according to 1421/// C++0x [class.virtual]p3. 1422bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1423 const CXXMethodDecl *Old) { 1424 if (!Old->hasAttr<FinalAttr>()) 1425 return false; 1426 1427 Diag(New->getLocation(), diag::err_final_function_overridden) 1428 << New->getDeclName(); 1429 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1430 return true; 1431} 1432 1433/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1434/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1435/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1436/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1437/// present but parsing it has been deferred. 1438Decl * 1439Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1440 MultiTemplateParamsArg TemplateParameterLists, 1441 Expr *BW, const VirtSpecifiers &VS, 1442 bool HasDeferredInit) { 1443 const DeclSpec &DS = D.getDeclSpec(); 1444 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1445 DeclarationName Name = NameInfo.getName(); 1446 SourceLocation Loc = NameInfo.getLoc(); 1447 1448 // For anonymous bitfields, the location should point to the type. 1449 if (Loc.isInvalid()) 1450 Loc = D.getSourceRange().getBegin(); 1451 1452 Expr *BitWidth = static_cast<Expr*>(BW); 1453 1454 assert(isa<CXXRecordDecl>(CurContext)); 1455 assert(!DS.isFriendSpecified()); 1456 1457 bool isFunc = D.isDeclarationOfFunction(); 1458 1459 // C++ 9.2p6: A member shall not be declared to have automatic storage 1460 // duration (auto, register) or with the extern storage-class-specifier. 1461 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1462 // data members and cannot be applied to names declared const or static, 1463 // and cannot be applied to reference members. 1464 switch (DS.getStorageClassSpec()) { 1465 case DeclSpec::SCS_unspecified: 1466 case DeclSpec::SCS_typedef: 1467 case DeclSpec::SCS_static: 1468 // FALL THROUGH. 1469 break; 1470 case DeclSpec::SCS_mutable: 1471 if (isFunc) { 1472 if (DS.getStorageClassSpecLoc().isValid()) 1473 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1474 else 1475 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1476 1477 // FIXME: It would be nicer if the keyword was ignored only for this 1478 // declarator. Otherwise we could get follow-up errors. 1479 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1480 } 1481 break; 1482 default: 1483 if (DS.getStorageClassSpecLoc().isValid()) 1484 Diag(DS.getStorageClassSpecLoc(), 1485 diag::err_storageclass_invalid_for_member); 1486 else 1487 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1488 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1489 } 1490 1491 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1492 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1493 !isFunc); 1494 1495 Decl *Member; 1496 if (isInstField) { 1497 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1498 1499 // Data members must have identifiers for names. 1500 if (Name.getNameKind() != DeclarationName::Identifier) { 1501 Diag(Loc, diag::err_bad_variable_name) 1502 << Name; 1503 return 0; 1504 } 1505 1506 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1507 1508 // Member field could not be with "template" keyword. 1509 // So TemplateParameterLists should be empty in this case. 1510 if (TemplateParameterLists.size()) { 1511 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1512 if (TemplateParams->size()) { 1513 // There is no such thing as a member field template. 1514 Diag(D.getIdentifierLoc(), diag::err_template_member) 1515 << II 1516 << SourceRange(TemplateParams->getTemplateLoc(), 1517 TemplateParams->getRAngleLoc()); 1518 } else { 1519 // There is an extraneous 'template<>' for this member. 1520 Diag(TemplateParams->getTemplateLoc(), 1521 diag::err_template_member_noparams) 1522 << II 1523 << SourceRange(TemplateParams->getTemplateLoc(), 1524 TemplateParams->getRAngleLoc()); 1525 } 1526 return 0; 1527 } 1528 1529 if (SS.isSet() && !SS.isInvalid()) { 1530 // The user provided a superfluous scope specifier inside a class 1531 // definition: 1532 // 1533 // class X { 1534 // int X::member; 1535 // }; 1536 DeclContext *DC = 0; 1537 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1538 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1539 << Name << FixItHint::CreateRemoval(SS.getRange()); 1540 else 1541 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1542 << Name << SS.getRange(); 1543 1544 SS.clear(); 1545 } 1546 1547 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1548 HasDeferredInit, AS); 1549 assert(Member && "HandleField never returns null"); 1550 } else { 1551 assert(!HasDeferredInit); 1552 1553 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1554 if (!Member) { 1555 return 0; 1556 } 1557 1558 // Non-instance-fields can't have a bitfield. 1559 if (BitWidth) { 1560 if (Member->isInvalidDecl()) { 1561 // don't emit another diagnostic. 1562 } else if (isa<VarDecl>(Member)) { 1563 // C++ 9.6p3: A bit-field shall not be a static member. 1564 // "static member 'A' cannot be a bit-field" 1565 Diag(Loc, diag::err_static_not_bitfield) 1566 << Name << BitWidth->getSourceRange(); 1567 } else if (isa<TypedefDecl>(Member)) { 1568 // "typedef member 'x' cannot be a bit-field" 1569 Diag(Loc, diag::err_typedef_not_bitfield) 1570 << Name << BitWidth->getSourceRange(); 1571 } else { 1572 // A function typedef ("typedef int f(); f a;"). 1573 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1574 Diag(Loc, diag::err_not_integral_type_bitfield) 1575 << Name << cast<ValueDecl>(Member)->getType() 1576 << BitWidth->getSourceRange(); 1577 } 1578 1579 BitWidth = 0; 1580 Member->setInvalidDecl(); 1581 } 1582 1583 Member->setAccess(AS); 1584 1585 // If we have declared a member function template, set the access of the 1586 // templated declaration as well. 1587 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1588 FunTmpl->getTemplatedDecl()->setAccess(AS); 1589 } 1590 1591 if (VS.isOverrideSpecified()) { 1592 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1593 if (!MD || !MD->isVirtual()) { 1594 Diag(Member->getLocStart(), 1595 diag::override_keyword_only_allowed_on_virtual_member_functions) 1596 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1597 } else 1598 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1599 } 1600 if (VS.isFinalSpecified()) { 1601 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1602 if (!MD || !MD->isVirtual()) { 1603 Diag(Member->getLocStart(), 1604 diag::override_keyword_only_allowed_on_virtual_member_functions) 1605 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1606 } else 1607 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1608 } 1609 1610 if (VS.getLastLocation().isValid()) { 1611 // Update the end location of a method that has a virt-specifiers. 1612 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1613 MD->setRangeEnd(VS.getLastLocation()); 1614 } 1615 1616 CheckOverrideControl(Member); 1617 1618 assert((Name || isInstField) && "No identifier for non-field ?"); 1619 1620 if (isInstField) 1621 FieldCollector->Add(cast<FieldDecl>(Member)); 1622 return Member; 1623} 1624 1625/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1626/// in-class initializer for a non-static C++ class member, and after 1627/// instantiating an in-class initializer in a class template. Such actions 1628/// are deferred until the class is complete. 1629void 1630Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1631 Expr *InitExpr) { 1632 FieldDecl *FD = cast<FieldDecl>(D); 1633 1634 if (!InitExpr) { 1635 FD->setInvalidDecl(); 1636 FD->removeInClassInitializer(); 1637 return; 1638 } 1639 1640 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1641 FD->setInvalidDecl(); 1642 FD->removeInClassInitializer(); 1643 return; 1644 } 1645 1646 ExprResult Init = InitExpr; 1647 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1648 // FIXME: if there is no EqualLoc, this is list-initialization. 1649 Init = PerformCopyInitialization( 1650 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1651 if (Init.isInvalid()) { 1652 FD->setInvalidDecl(); 1653 return; 1654 } 1655 1656 CheckImplicitConversions(Init.get(), EqualLoc); 1657 } 1658 1659 // C++0x [class.base.init]p7: 1660 // The initialization of each base and member constitutes a 1661 // full-expression. 1662 Init = MaybeCreateExprWithCleanups(Init); 1663 if (Init.isInvalid()) { 1664 FD->setInvalidDecl(); 1665 return; 1666 } 1667 1668 InitExpr = Init.release(); 1669 1670 FD->setInClassInitializer(InitExpr); 1671} 1672 1673/// \brief Find the direct and/or virtual base specifiers that 1674/// correspond to the given base type, for use in base initialization 1675/// within a constructor. 1676static bool FindBaseInitializer(Sema &SemaRef, 1677 CXXRecordDecl *ClassDecl, 1678 QualType BaseType, 1679 const CXXBaseSpecifier *&DirectBaseSpec, 1680 const CXXBaseSpecifier *&VirtualBaseSpec) { 1681 // First, check for a direct base class. 1682 DirectBaseSpec = 0; 1683 for (CXXRecordDecl::base_class_const_iterator Base 1684 = ClassDecl->bases_begin(); 1685 Base != ClassDecl->bases_end(); ++Base) { 1686 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1687 // We found a direct base of this type. That's what we're 1688 // initializing. 1689 DirectBaseSpec = &*Base; 1690 break; 1691 } 1692 } 1693 1694 // Check for a virtual base class. 1695 // FIXME: We might be able to short-circuit this if we know in advance that 1696 // there are no virtual bases. 1697 VirtualBaseSpec = 0; 1698 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1699 // We haven't found a base yet; search the class hierarchy for a 1700 // virtual base class. 1701 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1702 /*DetectVirtual=*/false); 1703 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1704 BaseType, Paths)) { 1705 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1706 Path != Paths.end(); ++Path) { 1707 if (Path->back().Base->isVirtual()) { 1708 VirtualBaseSpec = Path->back().Base; 1709 break; 1710 } 1711 } 1712 } 1713 } 1714 1715 return DirectBaseSpec || VirtualBaseSpec; 1716} 1717 1718/// \brief Handle a C++ member initializer using braced-init-list syntax. 1719MemInitResult 1720Sema::ActOnMemInitializer(Decl *ConstructorD, 1721 Scope *S, 1722 CXXScopeSpec &SS, 1723 IdentifierInfo *MemberOrBase, 1724 ParsedType TemplateTypeTy, 1725 SourceLocation IdLoc, 1726 Expr *InitList, 1727 SourceLocation EllipsisLoc) { 1728 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1729 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1730} 1731 1732/// \brief Handle a C++ member initializer using parentheses syntax. 1733MemInitResult 1734Sema::ActOnMemInitializer(Decl *ConstructorD, 1735 Scope *S, 1736 CXXScopeSpec &SS, 1737 IdentifierInfo *MemberOrBase, 1738 ParsedType TemplateTypeTy, 1739 SourceLocation IdLoc, 1740 SourceLocation LParenLoc, 1741 Expr **Args, unsigned NumArgs, 1742 SourceLocation RParenLoc, 1743 SourceLocation EllipsisLoc) { 1744 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1745 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1746 RParenLoc), 1747 EllipsisLoc); 1748} 1749 1750namespace { 1751 1752// Callback to only accept typo corrections that can be a valid C++ member 1753// intializer: either a non-static field member or a base class. 1754class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1755 public: 1756 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1757 : ClassDecl(ClassDecl) {} 1758 1759 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1760 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1761 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1762 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1763 else 1764 return isa<TypeDecl>(ND); 1765 } 1766 return false; 1767 } 1768 1769 private: 1770 CXXRecordDecl *ClassDecl; 1771}; 1772 1773} 1774 1775/// \brief Handle a C++ member initializer. 1776MemInitResult 1777Sema::BuildMemInitializer(Decl *ConstructorD, 1778 Scope *S, 1779 CXXScopeSpec &SS, 1780 IdentifierInfo *MemberOrBase, 1781 ParsedType TemplateTypeTy, 1782 SourceLocation IdLoc, 1783 const MultiInitializer &Args, 1784 SourceLocation EllipsisLoc) { 1785 if (!ConstructorD) 1786 return true; 1787 1788 AdjustDeclIfTemplate(ConstructorD); 1789 1790 CXXConstructorDecl *Constructor 1791 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1792 if (!Constructor) { 1793 // The user wrote a constructor initializer on a function that is 1794 // not a C++ constructor. Ignore the error for now, because we may 1795 // have more member initializers coming; we'll diagnose it just 1796 // once in ActOnMemInitializers. 1797 return true; 1798 } 1799 1800 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1801 1802 // C++ [class.base.init]p2: 1803 // Names in a mem-initializer-id are looked up in the scope of the 1804 // constructor's class and, if not found in that scope, are looked 1805 // up in the scope containing the constructor's definition. 1806 // [Note: if the constructor's class contains a member with the 1807 // same name as a direct or virtual base class of the class, a 1808 // mem-initializer-id naming the member or base class and composed 1809 // of a single identifier refers to the class member. A 1810 // mem-initializer-id for the hidden base class may be specified 1811 // using a qualified name. ] 1812 if (!SS.getScopeRep() && !TemplateTypeTy) { 1813 // Look for a member, first. 1814 DeclContext::lookup_result Result 1815 = ClassDecl->lookup(MemberOrBase); 1816 if (Result.first != Result.second) { 1817 ValueDecl *Member; 1818 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1819 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1820 if (EllipsisLoc.isValid()) 1821 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1822 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1823 1824 return BuildMemberInitializer(Member, Args, IdLoc); 1825 } 1826 } 1827 } 1828 // It didn't name a member, so see if it names a class. 1829 QualType BaseType; 1830 TypeSourceInfo *TInfo = 0; 1831 1832 if (TemplateTypeTy) { 1833 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1834 } else { 1835 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1836 LookupParsedName(R, S, &SS); 1837 1838 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1839 if (!TyD) { 1840 if (R.isAmbiguous()) return true; 1841 1842 // We don't want access-control diagnostics here. 1843 R.suppressDiagnostics(); 1844 1845 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1846 bool NotUnknownSpecialization = false; 1847 DeclContext *DC = computeDeclContext(SS, false); 1848 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1849 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1850 1851 if (!NotUnknownSpecialization) { 1852 // When the scope specifier can refer to a member of an unknown 1853 // specialization, we take it as a type name. 1854 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1855 SS.getWithLocInContext(Context), 1856 *MemberOrBase, IdLoc); 1857 if (BaseType.isNull()) 1858 return true; 1859 1860 R.clear(); 1861 R.setLookupName(MemberOrBase); 1862 } 1863 } 1864 1865 // If no results were found, try to correct typos. 1866 TypoCorrection Corr; 1867 MemInitializerValidatorCCC Validator(ClassDecl); 1868 if (R.empty() && BaseType.isNull() && 1869 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1870 &Validator, ClassDecl))) { 1871 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1872 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1873 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1874 // We have found a non-static data member with a similar 1875 // name to what was typed; complain and initialize that 1876 // member. 1877 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1878 << MemberOrBase << true << CorrectedQuotedStr 1879 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1880 Diag(Member->getLocation(), diag::note_previous_decl) 1881 << CorrectedQuotedStr; 1882 1883 return BuildMemberInitializer(Member, Args, IdLoc); 1884 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1885 const CXXBaseSpecifier *DirectBaseSpec; 1886 const CXXBaseSpecifier *VirtualBaseSpec; 1887 if (FindBaseInitializer(*this, ClassDecl, 1888 Context.getTypeDeclType(Type), 1889 DirectBaseSpec, VirtualBaseSpec)) { 1890 // We have found a direct or virtual base class with a 1891 // similar name to what was typed; complain and initialize 1892 // that base class. 1893 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1894 << MemberOrBase << false << CorrectedQuotedStr 1895 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1896 1897 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1898 : VirtualBaseSpec; 1899 Diag(BaseSpec->getSourceRange().getBegin(), 1900 diag::note_base_class_specified_here) 1901 << BaseSpec->getType() 1902 << BaseSpec->getSourceRange(); 1903 1904 TyD = Type; 1905 } 1906 } 1907 } 1908 1909 if (!TyD && BaseType.isNull()) { 1910 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1911 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1912 return true; 1913 } 1914 } 1915 1916 if (BaseType.isNull()) { 1917 BaseType = Context.getTypeDeclType(TyD); 1918 if (SS.isSet()) { 1919 NestedNameSpecifier *Qualifier = 1920 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1921 1922 // FIXME: preserve source range information 1923 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1924 } 1925 } 1926 } 1927 1928 if (!TInfo) 1929 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1930 1931 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1932} 1933 1934/// Checks a member initializer expression for cases where reference (or 1935/// pointer) members are bound to by-value parameters (or their addresses). 1936static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1937 Expr *Init, 1938 SourceLocation IdLoc) { 1939 QualType MemberTy = Member->getType(); 1940 1941 // We only handle pointers and references currently. 1942 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1943 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1944 return; 1945 1946 const bool IsPointer = MemberTy->isPointerType(); 1947 if (IsPointer) { 1948 if (const UnaryOperator *Op 1949 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1950 // The only case we're worried about with pointers requires taking the 1951 // address. 1952 if (Op->getOpcode() != UO_AddrOf) 1953 return; 1954 1955 Init = Op->getSubExpr(); 1956 } else { 1957 // We only handle address-of expression initializers for pointers. 1958 return; 1959 } 1960 } 1961 1962 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1963 // Taking the address of a temporary will be diagnosed as a hard error. 1964 if (IsPointer) 1965 return; 1966 1967 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1968 << Member << Init->getSourceRange(); 1969 } else if (const DeclRefExpr *DRE 1970 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1971 // We only warn when referring to a non-reference parameter declaration. 1972 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1973 if (!Parameter || Parameter->getType()->isReferenceType()) 1974 return; 1975 1976 S.Diag(Init->getExprLoc(), 1977 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1978 : diag::warn_bind_ref_member_to_parameter) 1979 << Member << Parameter << Init->getSourceRange(); 1980 } else { 1981 // Other initializers are fine. 1982 return; 1983 } 1984 1985 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1986 << (unsigned)IsPointer; 1987} 1988 1989/// Checks an initializer expression for use of uninitialized fields, such as 1990/// containing the field that is being initialized. Returns true if there is an 1991/// uninitialized field was used an updates the SourceLocation parameter; false 1992/// otherwise. 1993static bool InitExprContainsUninitializedFields(const Stmt *S, 1994 const ValueDecl *LhsField, 1995 SourceLocation *L) { 1996 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1997 1998 if (isa<CallExpr>(S)) { 1999 // Do not descend into function calls or constructors, as the use 2000 // of an uninitialized field may be valid. One would have to inspect 2001 // the contents of the function/ctor to determine if it is safe or not. 2002 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2003 // may be safe, depending on what the function/ctor does. 2004 return false; 2005 } 2006 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2007 const NamedDecl *RhsField = ME->getMemberDecl(); 2008 2009 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2010 // The member expression points to a static data member. 2011 assert(VD->isStaticDataMember() && 2012 "Member points to non-static data member!"); 2013 (void)VD; 2014 return false; 2015 } 2016 2017 if (isa<EnumConstantDecl>(RhsField)) { 2018 // The member expression points to an enum. 2019 return false; 2020 } 2021 2022 if (RhsField == LhsField) { 2023 // Initializing a field with itself. Throw a warning. 2024 // But wait; there are exceptions! 2025 // Exception #1: The field may not belong to this record. 2026 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2027 const Expr *base = ME->getBase(); 2028 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2029 // Even though the field matches, it does not belong to this record. 2030 return false; 2031 } 2032 // None of the exceptions triggered; return true to indicate an 2033 // uninitialized field was used. 2034 *L = ME->getMemberLoc(); 2035 return true; 2036 } 2037 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2038 // sizeof/alignof doesn't reference contents, do not warn. 2039 return false; 2040 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2041 // address-of doesn't reference contents (the pointer may be dereferenced 2042 // in the same expression but it would be rare; and weird). 2043 if (UOE->getOpcode() == UO_AddrOf) 2044 return false; 2045 } 2046 for (Stmt::const_child_range it = S->children(); it; ++it) { 2047 if (!*it) { 2048 // An expression such as 'member(arg ?: "")' may trigger this. 2049 continue; 2050 } 2051 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2052 return true; 2053 } 2054 return false; 2055} 2056 2057MemInitResult 2058Sema::BuildMemberInitializer(ValueDecl *Member, 2059 const MultiInitializer &Args, 2060 SourceLocation IdLoc) { 2061 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2062 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2063 assert((DirectMember || IndirectMember) && 2064 "Member must be a FieldDecl or IndirectFieldDecl"); 2065 2066 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2067 return true; 2068 2069 if (Member->isInvalidDecl()) 2070 return true; 2071 2072 // Diagnose value-uses of fields to initialize themselves, e.g. 2073 // foo(foo) 2074 // where foo is not also a parameter to the constructor. 2075 // TODO: implement -Wuninitialized and fold this into that framework. 2076 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2077 I != E; ++I) { 2078 SourceLocation L; 2079 Expr *Arg = *I; 2080 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2081 Arg = DIE->getInit(); 2082 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2083 // FIXME: Return true in the case when other fields are used before being 2084 // uninitialized. For example, let this field be the i'th field. When 2085 // initializing the i'th field, throw a warning if any of the >= i'th 2086 // fields are used, as they are not yet initialized. 2087 // Right now we are only handling the case where the i'th field uses 2088 // itself in its initializer. 2089 Diag(L, diag::warn_field_is_uninit); 2090 } 2091 } 2092 2093 bool HasDependentArg = Args.isTypeDependent(); 2094 2095 Expr *Init; 2096 if (Member->getType()->isDependentType() || HasDependentArg) { 2097 // Can't check initialization for a member of dependent type or when 2098 // any of the arguments are type-dependent expressions. 2099 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2100 2101 DiscardCleanupsInEvaluationContext(); 2102 } else { 2103 // Initialize the member. 2104 InitializedEntity MemberEntity = 2105 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2106 : InitializedEntity::InitializeMember(IndirectMember, 0); 2107 InitializationKind Kind = 2108 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2109 Args.getEndLoc()); 2110 2111 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2112 if (MemberInit.isInvalid()) 2113 return true; 2114 2115 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2116 2117 // C++0x [class.base.init]p7: 2118 // The initialization of each base and member constitutes a 2119 // full-expression. 2120 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2121 if (MemberInit.isInvalid()) 2122 return true; 2123 2124 // If we are in a dependent context, template instantiation will 2125 // perform this type-checking again. Just save the arguments that we 2126 // received in a ParenListExpr. 2127 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2128 // of the information that we have about the member 2129 // initializer. However, deconstructing the ASTs is a dicey process, 2130 // and this approach is far more likely to get the corner cases right. 2131 if (CurContext->isDependentContext()) { 2132 Init = Args.CreateInitExpr(Context, 2133 Member->getType().getNonReferenceType()); 2134 } else { 2135 Init = MemberInit.get(); 2136 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2137 } 2138 } 2139 2140 if (DirectMember) { 2141 return new (Context) CXXCtorInitializer(Context, DirectMember, 2142 IdLoc, Args.getStartLoc(), 2143 Init, Args.getEndLoc()); 2144 } else { 2145 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2146 IdLoc, Args.getStartLoc(), 2147 Init, Args.getEndLoc()); 2148 } 2149} 2150 2151MemInitResult 2152Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2153 const MultiInitializer &Args, 2154 CXXRecordDecl *ClassDecl) { 2155 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2156 if (!LangOpts.CPlusPlus0x) 2157 return Diag(NameLoc, diag::err_delegating_ctor) 2158 << TInfo->getTypeLoc().getLocalSourceRange(); 2159 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2160 2161 // Initialize the object. 2162 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2163 QualType(ClassDecl->getTypeForDecl(), 0)); 2164 InitializationKind Kind = 2165 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2166 Args.getEndLoc()); 2167 2168 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2169 if (DelegationInit.isInvalid()) 2170 return true; 2171 2172 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2173 "Delegating constructor with no target?"); 2174 2175 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2176 2177 // C++0x [class.base.init]p7: 2178 // The initialization of each base and member constitutes a 2179 // full-expression. 2180 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2181 if (DelegationInit.isInvalid()) 2182 return true; 2183 2184 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2185 DelegationInit.takeAs<Expr>(), 2186 Args.getEndLoc()); 2187} 2188 2189MemInitResult 2190Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2191 const MultiInitializer &Args, 2192 CXXRecordDecl *ClassDecl, 2193 SourceLocation EllipsisLoc) { 2194 bool HasDependentArg = Args.isTypeDependent(); 2195 2196 SourceLocation BaseLoc 2197 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2198 2199 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2200 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2201 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2202 2203 // C++ [class.base.init]p2: 2204 // [...] Unless the mem-initializer-id names a nonstatic data 2205 // member of the constructor's class or a direct or virtual base 2206 // of that class, the mem-initializer is ill-formed. A 2207 // mem-initializer-list can initialize a base class using any 2208 // name that denotes that base class type. 2209 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2210 2211 if (EllipsisLoc.isValid()) { 2212 // This is a pack expansion. 2213 if (!BaseType->containsUnexpandedParameterPack()) { 2214 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2215 << SourceRange(BaseLoc, Args.getEndLoc()); 2216 2217 EllipsisLoc = SourceLocation(); 2218 } 2219 } else { 2220 // Check for any unexpanded parameter packs. 2221 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2222 return true; 2223 2224 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2225 return true; 2226 } 2227 2228 // Check for direct and virtual base classes. 2229 const CXXBaseSpecifier *DirectBaseSpec = 0; 2230 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2231 if (!Dependent) { 2232 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2233 BaseType)) 2234 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2235 2236 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2237 VirtualBaseSpec); 2238 2239 // C++ [base.class.init]p2: 2240 // Unless the mem-initializer-id names a nonstatic data member of the 2241 // constructor's class or a direct or virtual base of that class, the 2242 // mem-initializer is ill-formed. 2243 if (!DirectBaseSpec && !VirtualBaseSpec) { 2244 // If the class has any dependent bases, then it's possible that 2245 // one of those types will resolve to the same type as 2246 // BaseType. Therefore, just treat this as a dependent base 2247 // class initialization. FIXME: Should we try to check the 2248 // initialization anyway? It seems odd. 2249 if (ClassDecl->hasAnyDependentBases()) 2250 Dependent = true; 2251 else 2252 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2253 << BaseType << Context.getTypeDeclType(ClassDecl) 2254 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2255 } 2256 } 2257 2258 if (Dependent) { 2259 // Can't check initialization for a base of dependent type or when 2260 // any of the arguments are type-dependent expressions. 2261 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2262 2263 DiscardCleanupsInEvaluationContext(); 2264 2265 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2266 /*IsVirtual=*/false, 2267 Args.getStartLoc(), BaseInit, 2268 Args.getEndLoc(), EllipsisLoc); 2269 } 2270 2271 // C++ [base.class.init]p2: 2272 // If a mem-initializer-id is ambiguous because it designates both 2273 // a direct non-virtual base class and an inherited virtual base 2274 // class, the mem-initializer is ill-formed. 2275 if (DirectBaseSpec && VirtualBaseSpec) 2276 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2277 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2278 2279 CXXBaseSpecifier *BaseSpec 2280 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2281 if (!BaseSpec) 2282 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2283 2284 // Initialize the base. 2285 InitializedEntity BaseEntity = 2286 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2287 InitializationKind Kind = 2288 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2289 Args.getEndLoc()); 2290 2291 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2292 if (BaseInit.isInvalid()) 2293 return true; 2294 2295 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2296 2297 // C++0x [class.base.init]p7: 2298 // The initialization of each base and member constitutes a 2299 // full-expression. 2300 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2301 if (BaseInit.isInvalid()) 2302 return true; 2303 2304 // If we are in a dependent context, template instantiation will 2305 // perform this type-checking again. Just save the arguments that we 2306 // received in a ParenListExpr. 2307 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2308 // of the information that we have about the base 2309 // initializer. However, deconstructing the ASTs is a dicey process, 2310 // and this approach is far more likely to get the corner cases right. 2311 if (CurContext->isDependentContext()) 2312 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2313 2314 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2315 BaseSpec->isVirtual(), 2316 Args.getStartLoc(), 2317 BaseInit.takeAs<Expr>(), 2318 Args.getEndLoc(), EllipsisLoc); 2319} 2320 2321// Create a static_cast\<T&&>(expr). 2322static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2323 QualType ExprType = E->getType(); 2324 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2325 SourceLocation ExprLoc = E->getLocStart(); 2326 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2327 TargetType, ExprLoc); 2328 2329 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2330 SourceRange(ExprLoc, ExprLoc), 2331 E->getSourceRange()).take(); 2332} 2333 2334/// ImplicitInitializerKind - How an implicit base or member initializer should 2335/// initialize its base or member. 2336enum ImplicitInitializerKind { 2337 IIK_Default, 2338 IIK_Copy, 2339 IIK_Move 2340}; 2341 2342static bool 2343BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2344 ImplicitInitializerKind ImplicitInitKind, 2345 CXXBaseSpecifier *BaseSpec, 2346 bool IsInheritedVirtualBase, 2347 CXXCtorInitializer *&CXXBaseInit) { 2348 InitializedEntity InitEntity 2349 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2350 IsInheritedVirtualBase); 2351 2352 ExprResult BaseInit; 2353 2354 switch (ImplicitInitKind) { 2355 case IIK_Default: { 2356 InitializationKind InitKind 2357 = InitializationKind::CreateDefault(Constructor->getLocation()); 2358 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2359 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2360 MultiExprArg(SemaRef, 0, 0)); 2361 break; 2362 } 2363 2364 case IIK_Move: 2365 case IIK_Copy: { 2366 bool Moving = ImplicitInitKind == IIK_Move; 2367 ParmVarDecl *Param = Constructor->getParamDecl(0); 2368 QualType ParamType = Param->getType().getNonReferenceType(); 2369 2370 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2371 2372 Expr *CopyCtorArg = 2373 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2374 Constructor->getLocation(), ParamType, 2375 VK_LValue, 0); 2376 2377 // Cast to the base class to avoid ambiguities. 2378 QualType ArgTy = 2379 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2380 ParamType.getQualifiers()); 2381 2382 if (Moving) { 2383 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2384 } 2385 2386 CXXCastPath BasePath; 2387 BasePath.push_back(BaseSpec); 2388 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2389 CK_UncheckedDerivedToBase, 2390 Moving ? VK_XValue : VK_LValue, 2391 &BasePath).take(); 2392 2393 InitializationKind InitKind 2394 = InitializationKind::CreateDirect(Constructor->getLocation(), 2395 SourceLocation(), SourceLocation()); 2396 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2397 &CopyCtorArg, 1); 2398 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2399 MultiExprArg(&CopyCtorArg, 1)); 2400 break; 2401 } 2402 } 2403 2404 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2405 if (BaseInit.isInvalid()) 2406 return true; 2407 2408 CXXBaseInit = 2409 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2410 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2411 SourceLocation()), 2412 BaseSpec->isVirtual(), 2413 SourceLocation(), 2414 BaseInit.takeAs<Expr>(), 2415 SourceLocation(), 2416 SourceLocation()); 2417 2418 return false; 2419} 2420 2421static bool RefersToRValueRef(Expr *MemRef) { 2422 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2423 return Referenced->getType()->isRValueReferenceType(); 2424} 2425 2426static bool 2427BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2428 ImplicitInitializerKind ImplicitInitKind, 2429 FieldDecl *Field, IndirectFieldDecl *Indirect, 2430 CXXCtorInitializer *&CXXMemberInit) { 2431 if (Field->isInvalidDecl()) 2432 return true; 2433 2434 SourceLocation Loc = Constructor->getLocation(); 2435 2436 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2437 bool Moving = ImplicitInitKind == IIK_Move; 2438 ParmVarDecl *Param = Constructor->getParamDecl(0); 2439 QualType ParamType = Param->getType().getNonReferenceType(); 2440 2441 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2442 2443 // Suppress copying zero-width bitfields. 2444 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2445 return false; 2446 2447 Expr *MemberExprBase = 2448 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2449 Loc, ParamType, VK_LValue, 0); 2450 2451 if (Moving) { 2452 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2453 } 2454 2455 // Build a reference to this field within the parameter. 2456 CXXScopeSpec SS; 2457 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2458 Sema::LookupMemberName); 2459 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2460 : cast<ValueDecl>(Field), AS_public); 2461 MemberLookup.resolveKind(); 2462 ExprResult CtorArg 2463 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2464 ParamType, Loc, 2465 /*IsArrow=*/false, 2466 SS, 2467 /*FirstQualifierInScope=*/0, 2468 MemberLookup, 2469 /*TemplateArgs=*/0); 2470 if (CtorArg.isInvalid()) 2471 return true; 2472 2473 // C++11 [class.copy]p15: 2474 // - if a member m has rvalue reference type T&&, it is direct-initialized 2475 // with static_cast<T&&>(x.m); 2476 if (RefersToRValueRef(CtorArg.get())) { 2477 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2478 } 2479 2480 // When the field we are copying is an array, create index variables for 2481 // each dimension of the array. We use these index variables to subscript 2482 // the source array, and other clients (e.g., CodeGen) will perform the 2483 // necessary iteration with these index variables. 2484 SmallVector<VarDecl *, 4> IndexVariables; 2485 QualType BaseType = Field->getType(); 2486 QualType SizeType = SemaRef.Context.getSizeType(); 2487 bool InitializingArray = false; 2488 while (const ConstantArrayType *Array 2489 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2490 InitializingArray = true; 2491 // Create the iteration variable for this array index. 2492 IdentifierInfo *IterationVarName = 0; 2493 { 2494 llvm::SmallString<8> Str; 2495 llvm::raw_svector_ostream OS(Str); 2496 OS << "__i" << IndexVariables.size(); 2497 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2498 } 2499 VarDecl *IterationVar 2500 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2501 IterationVarName, SizeType, 2502 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2503 SC_None, SC_None); 2504 IndexVariables.push_back(IterationVar); 2505 2506 // Create a reference to the iteration variable. 2507 ExprResult IterationVarRef 2508 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2509 assert(!IterationVarRef.isInvalid() && 2510 "Reference to invented variable cannot fail!"); 2511 2512 // Subscript the array with this iteration variable. 2513 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2514 IterationVarRef.take(), 2515 Loc); 2516 if (CtorArg.isInvalid()) 2517 return true; 2518 2519 BaseType = Array->getElementType(); 2520 } 2521 2522 // The array subscript expression is an lvalue, which is wrong for moving. 2523 if (Moving && InitializingArray) 2524 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2525 2526 // Construct the entity that we will be initializing. For an array, this 2527 // will be first element in the array, which may require several levels 2528 // of array-subscript entities. 2529 SmallVector<InitializedEntity, 4> Entities; 2530 Entities.reserve(1 + IndexVariables.size()); 2531 if (Indirect) 2532 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2533 else 2534 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2535 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2536 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2537 0, 2538 Entities.back())); 2539 2540 // Direct-initialize to use the copy constructor. 2541 InitializationKind InitKind = 2542 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2543 2544 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2545 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2546 &CtorArgE, 1); 2547 2548 ExprResult MemberInit 2549 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2550 MultiExprArg(&CtorArgE, 1)); 2551 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2552 if (MemberInit.isInvalid()) 2553 return true; 2554 2555 if (Indirect) { 2556 assert(IndexVariables.size() == 0 && 2557 "Indirect field improperly initialized"); 2558 CXXMemberInit 2559 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2560 Loc, Loc, 2561 MemberInit.takeAs<Expr>(), 2562 Loc); 2563 } else 2564 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2565 Loc, MemberInit.takeAs<Expr>(), 2566 Loc, 2567 IndexVariables.data(), 2568 IndexVariables.size()); 2569 return false; 2570 } 2571 2572 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2573 2574 QualType FieldBaseElementType = 2575 SemaRef.Context.getBaseElementType(Field->getType()); 2576 2577 if (FieldBaseElementType->isRecordType()) { 2578 InitializedEntity InitEntity 2579 = Indirect? InitializedEntity::InitializeMember(Indirect) 2580 : InitializedEntity::InitializeMember(Field); 2581 InitializationKind InitKind = 2582 InitializationKind::CreateDefault(Loc); 2583 2584 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2585 ExprResult MemberInit = 2586 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2587 2588 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2589 if (MemberInit.isInvalid()) 2590 return true; 2591 2592 if (Indirect) 2593 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2594 Indirect, Loc, 2595 Loc, 2596 MemberInit.get(), 2597 Loc); 2598 else 2599 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2600 Field, Loc, Loc, 2601 MemberInit.get(), 2602 Loc); 2603 return false; 2604 } 2605 2606 if (!Field->getParent()->isUnion()) { 2607 if (FieldBaseElementType->isReferenceType()) { 2608 SemaRef.Diag(Constructor->getLocation(), 2609 diag::err_uninitialized_member_in_ctor) 2610 << (int)Constructor->isImplicit() 2611 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2612 << 0 << Field->getDeclName(); 2613 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2614 return true; 2615 } 2616 2617 if (FieldBaseElementType.isConstQualified()) { 2618 SemaRef.Diag(Constructor->getLocation(), 2619 diag::err_uninitialized_member_in_ctor) 2620 << (int)Constructor->isImplicit() 2621 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2622 << 1 << Field->getDeclName(); 2623 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2624 return true; 2625 } 2626 } 2627 2628 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2629 FieldBaseElementType->isObjCRetainableType() && 2630 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2631 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2632 // Instant objects: 2633 // Default-initialize Objective-C pointers to NULL. 2634 CXXMemberInit 2635 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2636 Loc, Loc, 2637 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2638 Loc); 2639 return false; 2640 } 2641 2642 // Nothing to initialize. 2643 CXXMemberInit = 0; 2644 return false; 2645} 2646 2647namespace { 2648struct BaseAndFieldInfo { 2649 Sema &S; 2650 CXXConstructorDecl *Ctor; 2651 bool AnyErrorsInInits; 2652 ImplicitInitializerKind IIK; 2653 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2654 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2655 2656 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2657 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2658 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2659 if (Generated && Ctor->isCopyConstructor()) 2660 IIK = IIK_Copy; 2661 else if (Generated && Ctor->isMoveConstructor()) 2662 IIK = IIK_Move; 2663 else 2664 IIK = IIK_Default; 2665 } 2666 2667 bool isImplicitCopyOrMove() const { 2668 switch (IIK) { 2669 case IIK_Copy: 2670 case IIK_Move: 2671 return true; 2672 2673 case IIK_Default: 2674 return false; 2675 } 2676 2677 return false; 2678 } 2679}; 2680} 2681 2682/// \brief Determine whether the given indirect field declaration is somewhere 2683/// within an anonymous union. 2684static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2685 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2686 CEnd = F->chain_end(); 2687 C != CEnd; ++C) 2688 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2689 if (Record->isUnion()) 2690 return true; 2691 2692 return false; 2693} 2694 2695/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2696/// array type. 2697static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2698 if (T->isIncompleteArrayType()) 2699 return true; 2700 2701 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2702 if (!ArrayT->getSize()) 2703 return true; 2704 2705 T = ArrayT->getElementType(); 2706 } 2707 2708 return false; 2709} 2710 2711static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2712 FieldDecl *Field, 2713 IndirectFieldDecl *Indirect = 0) { 2714 2715 // Overwhelmingly common case: we have a direct initializer for this field. 2716 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2717 Info.AllToInit.push_back(Init); 2718 return false; 2719 } 2720 2721 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2722 // has a brace-or-equal-initializer, the entity is initialized as specified 2723 // in [dcl.init]. 2724 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2725 CXXCtorInitializer *Init; 2726 if (Indirect) 2727 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2728 SourceLocation(), 2729 SourceLocation(), 0, 2730 SourceLocation()); 2731 else 2732 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2733 SourceLocation(), 2734 SourceLocation(), 0, 2735 SourceLocation()); 2736 Info.AllToInit.push_back(Init); 2737 return false; 2738 } 2739 2740 // Don't build an implicit initializer for union members if none was 2741 // explicitly specified. 2742 if (Field->getParent()->isUnion() || 2743 (Indirect && isWithinAnonymousUnion(Indirect))) 2744 return false; 2745 2746 // Don't initialize incomplete or zero-length arrays. 2747 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2748 return false; 2749 2750 // Don't try to build an implicit initializer if there were semantic 2751 // errors in any of the initializers (and therefore we might be 2752 // missing some that the user actually wrote). 2753 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2754 return false; 2755 2756 CXXCtorInitializer *Init = 0; 2757 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2758 Indirect, Init)) 2759 return true; 2760 2761 if (Init) 2762 Info.AllToInit.push_back(Init); 2763 2764 return false; 2765} 2766 2767bool 2768Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2769 CXXCtorInitializer *Initializer) { 2770 assert(Initializer->isDelegatingInitializer()); 2771 Constructor->setNumCtorInitializers(1); 2772 CXXCtorInitializer **initializer = 2773 new (Context) CXXCtorInitializer*[1]; 2774 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2775 Constructor->setCtorInitializers(initializer); 2776 2777 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2778 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2779 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2780 } 2781 2782 DelegatingCtorDecls.push_back(Constructor); 2783 2784 return false; 2785} 2786 2787bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2788 CXXCtorInitializer **Initializers, 2789 unsigned NumInitializers, 2790 bool AnyErrors) { 2791 if (Constructor->isDependentContext()) { 2792 // Just store the initializers as written, they will be checked during 2793 // instantiation. 2794 if (NumInitializers > 0) { 2795 Constructor->setNumCtorInitializers(NumInitializers); 2796 CXXCtorInitializer **baseOrMemberInitializers = 2797 new (Context) CXXCtorInitializer*[NumInitializers]; 2798 memcpy(baseOrMemberInitializers, Initializers, 2799 NumInitializers * sizeof(CXXCtorInitializer*)); 2800 Constructor->setCtorInitializers(baseOrMemberInitializers); 2801 } 2802 2803 return false; 2804 } 2805 2806 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2807 2808 // We need to build the initializer AST according to order of construction 2809 // and not what user specified in the Initializers list. 2810 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2811 if (!ClassDecl) 2812 return true; 2813 2814 bool HadError = false; 2815 2816 for (unsigned i = 0; i < NumInitializers; i++) { 2817 CXXCtorInitializer *Member = Initializers[i]; 2818 2819 if (Member->isBaseInitializer()) 2820 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2821 else 2822 Info.AllBaseFields[Member->getAnyMember()] = Member; 2823 } 2824 2825 // Keep track of the direct virtual bases. 2826 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2827 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2828 E = ClassDecl->bases_end(); I != E; ++I) { 2829 if (I->isVirtual()) 2830 DirectVBases.insert(I); 2831 } 2832 2833 // Push virtual bases before others. 2834 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2835 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2836 2837 if (CXXCtorInitializer *Value 2838 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2839 Info.AllToInit.push_back(Value); 2840 } else if (!AnyErrors) { 2841 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2842 CXXCtorInitializer *CXXBaseInit; 2843 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2844 VBase, IsInheritedVirtualBase, 2845 CXXBaseInit)) { 2846 HadError = true; 2847 continue; 2848 } 2849 2850 Info.AllToInit.push_back(CXXBaseInit); 2851 } 2852 } 2853 2854 // Non-virtual bases. 2855 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2856 E = ClassDecl->bases_end(); Base != E; ++Base) { 2857 // Virtuals are in the virtual base list and already constructed. 2858 if (Base->isVirtual()) 2859 continue; 2860 2861 if (CXXCtorInitializer *Value 2862 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2863 Info.AllToInit.push_back(Value); 2864 } else if (!AnyErrors) { 2865 CXXCtorInitializer *CXXBaseInit; 2866 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2867 Base, /*IsInheritedVirtualBase=*/false, 2868 CXXBaseInit)) { 2869 HadError = true; 2870 continue; 2871 } 2872 2873 Info.AllToInit.push_back(CXXBaseInit); 2874 } 2875 } 2876 2877 // Fields. 2878 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2879 MemEnd = ClassDecl->decls_end(); 2880 Mem != MemEnd; ++Mem) { 2881 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2882 // C++ [class.bit]p2: 2883 // A declaration for a bit-field that omits the identifier declares an 2884 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2885 // initialized. 2886 if (F->isUnnamedBitfield()) 2887 continue; 2888 2889 // If we're not generating the implicit copy/move constructor, then we'll 2890 // handle anonymous struct/union fields based on their individual 2891 // indirect fields. 2892 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2893 continue; 2894 2895 if (CollectFieldInitializer(*this, Info, F)) 2896 HadError = true; 2897 continue; 2898 } 2899 2900 // Beyond this point, we only consider default initialization. 2901 if (Info.IIK != IIK_Default) 2902 continue; 2903 2904 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2905 if (F->getType()->isIncompleteArrayType()) { 2906 assert(ClassDecl->hasFlexibleArrayMember() && 2907 "Incomplete array type is not valid"); 2908 continue; 2909 } 2910 2911 // Initialize each field of an anonymous struct individually. 2912 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2913 HadError = true; 2914 2915 continue; 2916 } 2917 } 2918 2919 NumInitializers = Info.AllToInit.size(); 2920 if (NumInitializers > 0) { 2921 Constructor->setNumCtorInitializers(NumInitializers); 2922 CXXCtorInitializer **baseOrMemberInitializers = 2923 new (Context) CXXCtorInitializer*[NumInitializers]; 2924 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2925 NumInitializers * sizeof(CXXCtorInitializer*)); 2926 Constructor->setCtorInitializers(baseOrMemberInitializers); 2927 2928 // Constructors implicitly reference the base and member 2929 // destructors. 2930 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2931 Constructor->getParent()); 2932 } 2933 2934 return HadError; 2935} 2936 2937static void *GetKeyForTopLevelField(FieldDecl *Field) { 2938 // For anonymous unions, use the class declaration as the key. 2939 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2940 if (RT->getDecl()->isAnonymousStructOrUnion()) 2941 return static_cast<void *>(RT->getDecl()); 2942 } 2943 return static_cast<void *>(Field); 2944} 2945 2946static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2947 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2948} 2949 2950static void *GetKeyForMember(ASTContext &Context, 2951 CXXCtorInitializer *Member) { 2952 if (!Member->isAnyMemberInitializer()) 2953 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2954 2955 // For fields injected into the class via declaration of an anonymous union, 2956 // use its anonymous union class declaration as the unique key. 2957 FieldDecl *Field = Member->getAnyMember(); 2958 2959 // If the field is a member of an anonymous struct or union, our key 2960 // is the anonymous record decl that's a direct child of the class. 2961 RecordDecl *RD = Field->getParent(); 2962 if (RD->isAnonymousStructOrUnion()) { 2963 while (true) { 2964 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2965 if (Parent->isAnonymousStructOrUnion()) 2966 RD = Parent; 2967 else 2968 break; 2969 } 2970 2971 return static_cast<void *>(RD); 2972 } 2973 2974 return static_cast<void *>(Field); 2975} 2976 2977static void 2978DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2979 const CXXConstructorDecl *Constructor, 2980 CXXCtorInitializer **Inits, 2981 unsigned NumInits) { 2982 if (Constructor->getDeclContext()->isDependentContext()) 2983 return; 2984 2985 // Don't check initializers order unless the warning is enabled at the 2986 // location of at least one initializer. 2987 bool ShouldCheckOrder = false; 2988 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2989 CXXCtorInitializer *Init = Inits[InitIndex]; 2990 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2991 Init->getSourceLocation()) 2992 != DiagnosticsEngine::Ignored) { 2993 ShouldCheckOrder = true; 2994 break; 2995 } 2996 } 2997 if (!ShouldCheckOrder) 2998 return; 2999 3000 // Build the list of bases and members in the order that they'll 3001 // actually be initialized. The explicit initializers should be in 3002 // this same order but may be missing things. 3003 SmallVector<const void*, 32> IdealInitKeys; 3004 3005 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3006 3007 // 1. Virtual bases. 3008 for (CXXRecordDecl::base_class_const_iterator VBase = 3009 ClassDecl->vbases_begin(), 3010 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3011 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3012 3013 // 2. Non-virtual bases. 3014 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3015 E = ClassDecl->bases_end(); Base != E; ++Base) { 3016 if (Base->isVirtual()) 3017 continue; 3018 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3019 } 3020 3021 // 3. Direct fields. 3022 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3023 E = ClassDecl->field_end(); Field != E; ++Field) { 3024 if (Field->isUnnamedBitfield()) 3025 continue; 3026 3027 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3028 } 3029 3030 unsigned NumIdealInits = IdealInitKeys.size(); 3031 unsigned IdealIndex = 0; 3032 3033 CXXCtorInitializer *PrevInit = 0; 3034 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3035 CXXCtorInitializer *Init = Inits[InitIndex]; 3036 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3037 3038 // Scan forward to try to find this initializer in the idealized 3039 // initializers list. 3040 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3041 if (InitKey == IdealInitKeys[IdealIndex]) 3042 break; 3043 3044 // If we didn't find this initializer, it must be because we 3045 // scanned past it on a previous iteration. That can only 3046 // happen if we're out of order; emit a warning. 3047 if (IdealIndex == NumIdealInits && PrevInit) { 3048 Sema::SemaDiagnosticBuilder D = 3049 SemaRef.Diag(PrevInit->getSourceLocation(), 3050 diag::warn_initializer_out_of_order); 3051 3052 if (PrevInit->isAnyMemberInitializer()) 3053 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3054 else 3055 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3056 3057 if (Init->isAnyMemberInitializer()) 3058 D << 0 << Init->getAnyMember()->getDeclName(); 3059 else 3060 D << 1 << Init->getTypeSourceInfo()->getType(); 3061 3062 // Move back to the initializer's location in the ideal list. 3063 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3064 if (InitKey == IdealInitKeys[IdealIndex]) 3065 break; 3066 3067 assert(IdealIndex != NumIdealInits && 3068 "initializer not found in initializer list"); 3069 } 3070 3071 PrevInit = Init; 3072 } 3073} 3074 3075namespace { 3076bool CheckRedundantInit(Sema &S, 3077 CXXCtorInitializer *Init, 3078 CXXCtorInitializer *&PrevInit) { 3079 if (!PrevInit) { 3080 PrevInit = Init; 3081 return false; 3082 } 3083 3084 if (FieldDecl *Field = Init->getMember()) 3085 S.Diag(Init->getSourceLocation(), 3086 diag::err_multiple_mem_initialization) 3087 << Field->getDeclName() 3088 << Init->getSourceRange(); 3089 else { 3090 const Type *BaseClass = Init->getBaseClass(); 3091 assert(BaseClass && "neither field nor base"); 3092 S.Diag(Init->getSourceLocation(), 3093 diag::err_multiple_base_initialization) 3094 << QualType(BaseClass, 0) 3095 << Init->getSourceRange(); 3096 } 3097 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3098 << 0 << PrevInit->getSourceRange(); 3099 3100 return true; 3101} 3102 3103typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3104typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3105 3106bool CheckRedundantUnionInit(Sema &S, 3107 CXXCtorInitializer *Init, 3108 RedundantUnionMap &Unions) { 3109 FieldDecl *Field = Init->getAnyMember(); 3110 RecordDecl *Parent = Field->getParent(); 3111 NamedDecl *Child = Field; 3112 3113 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3114 if (Parent->isUnion()) { 3115 UnionEntry &En = Unions[Parent]; 3116 if (En.first && En.first != Child) { 3117 S.Diag(Init->getSourceLocation(), 3118 diag::err_multiple_mem_union_initialization) 3119 << Field->getDeclName() 3120 << Init->getSourceRange(); 3121 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3122 << 0 << En.second->getSourceRange(); 3123 return true; 3124 } 3125 if (!En.first) { 3126 En.first = Child; 3127 En.second = Init; 3128 } 3129 if (!Parent->isAnonymousStructOrUnion()) 3130 return false; 3131 } 3132 3133 Child = Parent; 3134 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3135 } 3136 3137 return false; 3138} 3139} 3140 3141/// ActOnMemInitializers - Handle the member initializers for a constructor. 3142void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3143 SourceLocation ColonLoc, 3144 CXXCtorInitializer **meminits, 3145 unsigned NumMemInits, 3146 bool AnyErrors) { 3147 if (!ConstructorDecl) 3148 return; 3149 3150 AdjustDeclIfTemplate(ConstructorDecl); 3151 3152 CXXConstructorDecl *Constructor 3153 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3154 3155 if (!Constructor) { 3156 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3157 return; 3158 } 3159 3160 CXXCtorInitializer **MemInits = 3161 reinterpret_cast<CXXCtorInitializer **>(meminits); 3162 3163 // Mapping for the duplicate initializers check. 3164 // For member initializers, this is keyed with a FieldDecl*. 3165 // For base initializers, this is keyed with a Type*. 3166 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3167 3168 // Mapping for the inconsistent anonymous-union initializers check. 3169 RedundantUnionMap MemberUnions; 3170 3171 bool HadError = false; 3172 for (unsigned i = 0; i < NumMemInits; i++) { 3173 CXXCtorInitializer *Init = MemInits[i]; 3174 3175 // Set the source order index. 3176 Init->setSourceOrder(i); 3177 3178 if (Init->isAnyMemberInitializer()) { 3179 FieldDecl *Field = Init->getAnyMember(); 3180 if (CheckRedundantInit(*this, Init, Members[Field]) || 3181 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3182 HadError = true; 3183 } else if (Init->isBaseInitializer()) { 3184 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3185 if (CheckRedundantInit(*this, Init, Members[Key])) 3186 HadError = true; 3187 } else { 3188 assert(Init->isDelegatingInitializer()); 3189 // This must be the only initializer 3190 if (i != 0 || NumMemInits > 1) { 3191 Diag(MemInits[0]->getSourceLocation(), 3192 diag::err_delegating_initializer_alone) 3193 << MemInits[0]->getSourceRange(); 3194 HadError = true; 3195 // We will treat this as being the only initializer. 3196 } 3197 SetDelegatingInitializer(Constructor, MemInits[i]); 3198 // Return immediately as the initializer is set. 3199 return; 3200 } 3201 } 3202 3203 if (HadError) 3204 return; 3205 3206 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3207 3208 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3209} 3210 3211void 3212Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3213 CXXRecordDecl *ClassDecl) { 3214 // Ignore dependent contexts. Also ignore unions, since their members never 3215 // have destructors implicitly called. 3216 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3217 return; 3218 3219 // FIXME: all the access-control diagnostics are positioned on the 3220 // field/base declaration. That's probably good; that said, the 3221 // user might reasonably want to know why the destructor is being 3222 // emitted, and we currently don't say. 3223 3224 // Non-static data members. 3225 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3226 E = ClassDecl->field_end(); I != E; ++I) { 3227 FieldDecl *Field = *I; 3228 if (Field->isInvalidDecl()) 3229 continue; 3230 3231 // Don't destroy incomplete or zero-length arrays. 3232 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3233 continue; 3234 3235 QualType FieldType = Context.getBaseElementType(Field->getType()); 3236 3237 const RecordType* RT = FieldType->getAs<RecordType>(); 3238 if (!RT) 3239 continue; 3240 3241 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3242 if (FieldClassDecl->isInvalidDecl()) 3243 continue; 3244 if (FieldClassDecl->hasTrivialDestructor()) 3245 continue; 3246 3247 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3248 assert(Dtor && "No dtor found for FieldClassDecl!"); 3249 CheckDestructorAccess(Field->getLocation(), Dtor, 3250 PDiag(diag::err_access_dtor_field) 3251 << Field->getDeclName() 3252 << FieldType); 3253 3254 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3255 } 3256 3257 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3258 3259 // Bases. 3260 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3261 E = ClassDecl->bases_end(); Base != E; ++Base) { 3262 // Bases are always records in a well-formed non-dependent class. 3263 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3264 3265 // Remember direct virtual bases. 3266 if (Base->isVirtual()) 3267 DirectVirtualBases.insert(RT); 3268 3269 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3270 // If our base class is invalid, we probably can't get its dtor anyway. 3271 if (BaseClassDecl->isInvalidDecl()) 3272 continue; 3273 // Ignore trivial destructors. 3274 if (BaseClassDecl->hasTrivialDestructor()) 3275 continue; 3276 3277 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3278 assert(Dtor && "No dtor found for BaseClassDecl!"); 3279 3280 // FIXME: caret should be on the start of the class name 3281 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3282 PDiag(diag::err_access_dtor_base) 3283 << Base->getType() 3284 << Base->getSourceRange()); 3285 3286 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3287 } 3288 3289 // Virtual bases. 3290 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3291 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3292 3293 // Bases are always records in a well-formed non-dependent class. 3294 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3295 3296 // Ignore direct virtual bases. 3297 if (DirectVirtualBases.count(RT)) 3298 continue; 3299 3300 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3301 // If our base class is invalid, we probably can't get its dtor anyway. 3302 if (BaseClassDecl->isInvalidDecl()) 3303 continue; 3304 // Ignore trivial destructors. 3305 if (BaseClassDecl->hasTrivialDestructor()) 3306 continue; 3307 3308 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3309 assert(Dtor && "No dtor found for BaseClassDecl!"); 3310 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3311 PDiag(diag::err_access_dtor_vbase) 3312 << VBase->getType()); 3313 3314 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3315 } 3316} 3317 3318void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3319 if (!CDtorDecl) 3320 return; 3321 3322 if (CXXConstructorDecl *Constructor 3323 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3324 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3325} 3326 3327bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3328 unsigned DiagID, AbstractDiagSelID SelID) { 3329 if (SelID == -1) 3330 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3331 else 3332 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3333} 3334 3335bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3336 const PartialDiagnostic &PD) { 3337 if (!getLangOptions().CPlusPlus) 3338 return false; 3339 3340 if (const ArrayType *AT = Context.getAsArrayType(T)) 3341 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3342 3343 if (const PointerType *PT = T->getAs<PointerType>()) { 3344 // Find the innermost pointer type. 3345 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3346 PT = T; 3347 3348 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3349 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3350 } 3351 3352 const RecordType *RT = T->getAs<RecordType>(); 3353 if (!RT) 3354 return false; 3355 3356 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3357 3358 // We can't answer whether something is abstract until it has a 3359 // definition. If it's currently being defined, we'll walk back 3360 // over all the declarations when we have a full definition. 3361 const CXXRecordDecl *Def = RD->getDefinition(); 3362 if (!Def || Def->isBeingDefined()) 3363 return false; 3364 3365 if (!RD->isAbstract()) 3366 return false; 3367 3368 Diag(Loc, PD) << RD->getDeclName(); 3369 DiagnoseAbstractType(RD); 3370 3371 return true; 3372} 3373 3374void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3375 // Check if we've already emitted the list of pure virtual functions 3376 // for this class. 3377 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3378 return; 3379 3380 CXXFinalOverriderMap FinalOverriders; 3381 RD->getFinalOverriders(FinalOverriders); 3382 3383 // Keep a set of seen pure methods so we won't diagnose the same method 3384 // more than once. 3385 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3386 3387 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3388 MEnd = FinalOverriders.end(); 3389 M != MEnd; 3390 ++M) { 3391 for (OverridingMethods::iterator SO = M->second.begin(), 3392 SOEnd = M->second.end(); 3393 SO != SOEnd; ++SO) { 3394 // C++ [class.abstract]p4: 3395 // A class is abstract if it contains or inherits at least one 3396 // pure virtual function for which the final overrider is pure 3397 // virtual. 3398 3399 // 3400 if (SO->second.size() != 1) 3401 continue; 3402 3403 if (!SO->second.front().Method->isPure()) 3404 continue; 3405 3406 if (!SeenPureMethods.insert(SO->second.front().Method)) 3407 continue; 3408 3409 Diag(SO->second.front().Method->getLocation(), 3410 diag::note_pure_virtual_function) 3411 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3412 } 3413 } 3414 3415 if (!PureVirtualClassDiagSet) 3416 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3417 PureVirtualClassDiagSet->insert(RD); 3418} 3419 3420namespace { 3421struct AbstractUsageInfo { 3422 Sema &S; 3423 CXXRecordDecl *Record; 3424 CanQualType AbstractType; 3425 bool Invalid; 3426 3427 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3428 : S(S), Record(Record), 3429 AbstractType(S.Context.getCanonicalType( 3430 S.Context.getTypeDeclType(Record))), 3431 Invalid(false) {} 3432 3433 void DiagnoseAbstractType() { 3434 if (Invalid) return; 3435 S.DiagnoseAbstractType(Record); 3436 Invalid = true; 3437 } 3438 3439 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3440}; 3441 3442struct CheckAbstractUsage { 3443 AbstractUsageInfo &Info; 3444 const NamedDecl *Ctx; 3445 3446 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3447 : Info(Info), Ctx(Ctx) {} 3448 3449 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3450 switch (TL.getTypeLocClass()) { 3451#define ABSTRACT_TYPELOC(CLASS, PARENT) 3452#define TYPELOC(CLASS, PARENT) \ 3453 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3454#include "clang/AST/TypeLocNodes.def" 3455 } 3456 } 3457 3458 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3459 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3460 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3461 if (!TL.getArg(I)) 3462 continue; 3463 3464 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3465 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3466 } 3467 } 3468 3469 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3470 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3471 } 3472 3473 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3474 // Visit the type parameters from a permissive context. 3475 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3476 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3477 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3478 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3479 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3480 // TODO: other template argument types? 3481 } 3482 } 3483 3484 // Visit pointee types from a permissive context. 3485#define CheckPolymorphic(Type) \ 3486 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3487 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3488 } 3489 CheckPolymorphic(PointerTypeLoc) 3490 CheckPolymorphic(ReferenceTypeLoc) 3491 CheckPolymorphic(MemberPointerTypeLoc) 3492 CheckPolymorphic(BlockPointerTypeLoc) 3493 CheckPolymorphic(AtomicTypeLoc) 3494 3495 /// Handle all the types we haven't given a more specific 3496 /// implementation for above. 3497 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3498 // Every other kind of type that we haven't called out already 3499 // that has an inner type is either (1) sugar or (2) contains that 3500 // inner type in some way as a subobject. 3501 if (TypeLoc Next = TL.getNextTypeLoc()) 3502 return Visit(Next, Sel); 3503 3504 // If there's no inner type and we're in a permissive context, 3505 // don't diagnose. 3506 if (Sel == Sema::AbstractNone) return; 3507 3508 // Check whether the type matches the abstract type. 3509 QualType T = TL.getType(); 3510 if (T->isArrayType()) { 3511 Sel = Sema::AbstractArrayType; 3512 T = Info.S.Context.getBaseElementType(T); 3513 } 3514 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3515 if (CT != Info.AbstractType) return; 3516 3517 // It matched; do some magic. 3518 if (Sel == Sema::AbstractArrayType) { 3519 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3520 << T << TL.getSourceRange(); 3521 } else { 3522 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3523 << Sel << T << TL.getSourceRange(); 3524 } 3525 Info.DiagnoseAbstractType(); 3526 } 3527}; 3528 3529void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3530 Sema::AbstractDiagSelID Sel) { 3531 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3532} 3533 3534} 3535 3536/// Check for invalid uses of an abstract type in a method declaration. 3537static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3538 CXXMethodDecl *MD) { 3539 // No need to do the check on definitions, which require that 3540 // the return/param types be complete. 3541 if (MD->doesThisDeclarationHaveABody()) 3542 return; 3543 3544 // For safety's sake, just ignore it if we don't have type source 3545 // information. This should never happen for non-implicit methods, 3546 // but... 3547 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3548 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3549} 3550 3551/// Check for invalid uses of an abstract type within a class definition. 3552static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3553 CXXRecordDecl *RD) { 3554 for (CXXRecordDecl::decl_iterator 3555 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3556 Decl *D = *I; 3557 if (D->isImplicit()) continue; 3558 3559 // Methods and method templates. 3560 if (isa<CXXMethodDecl>(D)) { 3561 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3562 } else if (isa<FunctionTemplateDecl>(D)) { 3563 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3564 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3565 3566 // Fields and static variables. 3567 } else if (isa<FieldDecl>(D)) { 3568 FieldDecl *FD = cast<FieldDecl>(D); 3569 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3570 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3571 } else if (isa<VarDecl>(D)) { 3572 VarDecl *VD = cast<VarDecl>(D); 3573 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3574 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3575 3576 // Nested classes and class templates. 3577 } else if (isa<CXXRecordDecl>(D)) { 3578 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3579 } else if (isa<ClassTemplateDecl>(D)) { 3580 CheckAbstractClassUsage(Info, 3581 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3582 } 3583 } 3584} 3585 3586/// \brief Perform semantic checks on a class definition that has been 3587/// completing, introducing implicitly-declared members, checking for 3588/// abstract types, etc. 3589void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3590 if (!Record) 3591 return; 3592 3593 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3594 AbstractUsageInfo Info(*this, Record); 3595 CheckAbstractClassUsage(Info, Record); 3596 } 3597 3598 // If this is not an aggregate type and has no user-declared constructor, 3599 // complain about any non-static data members of reference or const scalar 3600 // type, since they will never get initializers. 3601 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3602 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3603 bool Complained = false; 3604 for (RecordDecl::field_iterator F = Record->field_begin(), 3605 FEnd = Record->field_end(); 3606 F != FEnd; ++F) { 3607 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3608 continue; 3609 3610 if (F->getType()->isReferenceType() || 3611 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3612 if (!Complained) { 3613 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3614 << Record->getTagKind() << Record; 3615 Complained = true; 3616 } 3617 3618 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3619 << F->getType()->isReferenceType() 3620 << F->getDeclName(); 3621 } 3622 } 3623 } 3624 3625 if (Record->isDynamicClass() && !Record->isDependentType()) 3626 DynamicClasses.push_back(Record); 3627 3628 if (Record->getIdentifier()) { 3629 // C++ [class.mem]p13: 3630 // If T is the name of a class, then each of the following shall have a 3631 // name different from T: 3632 // - every member of every anonymous union that is a member of class T. 3633 // 3634 // C++ [class.mem]p14: 3635 // In addition, if class T has a user-declared constructor (12.1), every 3636 // non-static data member of class T shall have a name different from T. 3637 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3638 R.first != R.second; ++R.first) { 3639 NamedDecl *D = *R.first; 3640 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3641 isa<IndirectFieldDecl>(D)) { 3642 Diag(D->getLocation(), diag::err_member_name_of_class) 3643 << D->getDeclName(); 3644 break; 3645 } 3646 } 3647 } 3648 3649 // Warn if the class has virtual methods but non-virtual public destructor. 3650 if (Record->isPolymorphic() && !Record->isDependentType()) { 3651 CXXDestructorDecl *dtor = Record->getDestructor(); 3652 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3653 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3654 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3655 } 3656 3657 // See if a method overloads virtual methods in a base 3658 /// class without overriding any. 3659 if (!Record->isDependentType()) { 3660 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3661 MEnd = Record->method_end(); 3662 M != MEnd; ++M) { 3663 if (!(*M)->isStatic()) 3664 DiagnoseHiddenVirtualMethods(Record, *M); 3665 } 3666 } 3667 3668 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3669 // function that is not a constructor declares that member function to be 3670 // const. [...] The class of which that function is a member shall be 3671 // a literal type. 3672 // 3673 // It's fine to diagnose constructors here too: such constructors cannot 3674 // produce a constant expression, so are ill-formed (no diagnostic required). 3675 // 3676 // If the class has virtual bases, any constexpr members will already have 3677 // been diagnosed by the checks performed on the member declaration, so 3678 // suppress this (less useful) diagnostic. 3679 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3680 !Record->isLiteral() && !Record->getNumVBases()) { 3681 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3682 MEnd = Record->method_end(); 3683 M != MEnd; ++M) { 3684 if (M->isConstexpr() && M->isInstance()) { 3685 switch (Record->getTemplateSpecializationKind()) { 3686 case TSK_ImplicitInstantiation: 3687 case TSK_ExplicitInstantiationDeclaration: 3688 case TSK_ExplicitInstantiationDefinition: 3689 // If a template instantiates to a non-literal type, but its members 3690 // instantiate to constexpr functions, the template is technically 3691 // ill-formed, but we allow it for sanity. Such members are treated as 3692 // non-constexpr. 3693 (*M)->setConstexpr(false); 3694 continue; 3695 3696 case TSK_Undeclared: 3697 case TSK_ExplicitSpecialization: 3698 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3699 PDiag(diag::err_constexpr_method_non_literal)); 3700 break; 3701 } 3702 3703 // Only produce one error per class. 3704 break; 3705 } 3706 } 3707 } 3708 3709 // Declare inherited constructors. We do this eagerly here because: 3710 // - The standard requires an eager diagnostic for conflicting inherited 3711 // constructors from different classes. 3712 // - The lazy declaration of the other implicit constructors is so as to not 3713 // waste space and performance on classes that are not meant to be 3714 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3715 // have inherited constructors. 3716 DeclareInheritedConstructors(Record); 3717 3718 if (!Record->isDependentType()) 3719 CheckExplicitlyDefaultedMethods(Record); 3720} 3721 3722void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3723 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3724 ME = Record->method_end(); 3725 MI != ME; ++MI) { 3726 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3727 switch (getSpecialMember(*MI)) { 3728 case CXXDefaultConstructor: 3729 CheckExplicitlyDefaultedDefaultConstructor( 3730 cast<CXXConstructorDecl>(*MI)); 3731 break; 3732 3733 case CXXDestructor: 3734 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3735 break; 3736 3737 case CXXCopyConstructor: 3738 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3739 break; 3740 3741 case CXXCopyAssignment: 3742 CheckExplicitlyDefaultedCopyAssignment(*MI); 3743 break; 3744 3745 case CXXMoveConstructor: 3746 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3747 break; 3748 3749 case CXXMoveAssignment: 3750 CheckExplicitlyDefaultedMoveAssignment(*MI); 3751 break; 3752 3753 case CXXInvalid: 3754 llvm_unreachable("non-special member explicitly defaulted!"); 3755 } 3756 } 3757 } 3758 3759} 3760 3761void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3762 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3763 3764 // Whether this was the first-declared instance of the constructor. 3765 // This affects whether we implicitly add an exception spec (and, eventually, 3766 // constexpr). It is also ill-formed to explicitly default a constructor such 3767 // that it would be deleted. (C++0x [decl.fct.def.default]) 3768 bool First = CD == CD->getCanonicalDecl(); 3769 3770 bool HadError = false; 3771 if (CD->getNumParams() != 0) { 3772 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3773 << CD->getSourceRange(); 3774 HadError = true; 3775 } 3776 3777 ImplicitExceptionSpecification Spec 3778 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3779 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3780 if (EPI.ExceptionSpecType == EST_Delayed) { 3781 // Exception specification depends on some deferred part of the class. We'll 3782 // try again when the class's definition has been fully processed. 3783 return; 3784 } 3785 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3786 *ExceptionType = Context.getFunctionType( 3787 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3788 3789 // C++11 [dcl.fct.def.default]p2: 3790 // An explicitly-defaulted function may be declared constexpr only if it 3791 // would have been implicitly declared as constexpr, 3792 if (CD->isConstexpr()) { 3793 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3794 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3795 << CXXDefaultConstructor; 3796 HadError = true; 3797 } 3798 } 3799 // and may have an explicit exception-specification only if it is compatible 3800 // with the exception-specification on the implicit declaration. 3801 if (CtorType->hasExceptionSpec()) { 3802 if (CheckEquivalentExceptionSpec( 3803 PDiag(diag::err_incorrect_defaulted_exception_spec) 3804 << CXXDefaultConstructor, 3805 PDiag(), 3806 ExceptionType, SourceLocation(), 3807 CtorType, CD->getLocation())) { 3808 HadError = true; 3809 } 3810 } 3811 3812 // If a function is explicitly defaulted on its first declaration, 3813 if (First) { 3814 // -- it is implicitly considered to be constexpr if the implicit 3815 // definition would be, 3816 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3817 3818 // -- it is implicitly considered to have the same 3819 // exception-specification as if it had been implicitly declared 3820 // 3821 // FIXME: a compatible, but different, explicit exception specification 3822 // will be silently overridden. We should issue a warning if this happens. 3823 EPI.ExtInfo = CtorType->getExtInfo(); 3824 } 3825 3826 if (HadError) { 3827 CD->setInvalidDecl(); 3828 return; 3829 } 3830 3831 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3832 if (First) { 3833 CD->setDeletedAsWritten(); 3834 } else { 3835 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3836 << CXXDefaultConstructor; 3837 CD->setInvalidDecl(); 3838 } 3839 } 3840} 3841 3842void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3843 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3844 3845 // Whether this was the first-declared instance of the constructor. 3846 bool First = CD == CD->getCanonicalDecl(); 3847 3848 bool HadError = false; 3849 if (CD->getNumParams() != 1) { 3850 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3851 << CD->getSourceRange(); 3852 HadError = true; 3853 } 3854 3855 ImplicitExceptionSpecification Spec(Context); 3856 bool Const; 3857 llvm::tie(Spec, Const) = 3858 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3859 3860 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3861 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3862 *ExceptionType = Context.getFunctionType( 3863 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3864 3865 // Check for parameter type matching. 3866 // This is a copy ctor so we know it's a cv-qualified reference to T. 3867 QualType ArgType = CtorType->getArgType(0); 3868 if (ArgType->getPointeeType().isVolatileQualified()) { 3869 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3870 HadError = true; 3871 } 3872 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3873 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3874 HadError = true; 3875 } 3876 3877 // C++11 [dcl.fct.def.default]p2: 3878 // An explicitly-defaulted function may be declared constexpr only if it 3879 // would have been implicitly declared as constexpr, 3880 if (CD->isConstexpr()) { 3881 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3882 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3883 << CXXCopyConstructor; 3884 HadError = true; 3885 } 3886 } 3887 // and may have an explicit exception-specification only if it is compatible 3888 // with the exception-specification on the implicit declaration. 3889 if (CtorType->hasExceptionSpec()) { 3890 if (CheckEquivalentExceptionSpec( 3891 PDiag(diag::err_incorrect_defaulted_exception_spec) 3892 << CXXCopyConstructor, 3893 PDiag(), 3894 ExceptionType, SourceLocation(), 3895 CtorType, CD->getLocation())) { 3896 HadError = true; 3897 } 3898 } 3899 3900 // If a function is explicitly defaulted on its first declaration, 3901 if (First) { 3902 // -- it is implicitly considered to be constexpr if the implicit 3903 // definition would be, 3904 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3905 3906 // -- it is implicitly considered to have the same 3907 // exception-specification as if it had been implicitly declared, and 3908 // 3909 // FIXME: a compatible, but different, explicit exception specification 3910 // will be silently overridden. We should issue a warning if this happens. 3911 EPI.ExtInfo = CtorType->getExtInfo(); 3912 3913 // -- [...] it shall have the same parameter type as if it had been 3914 // implicitly declared. 3915 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3916 } 3917 3918 if (HadError) { 3919 CD->setInvalidDecl(); 3920 return; 3921 } 3922 3923 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3924 if (First) { 3925 CD->setDeletedAsWritten(); 3926 } else { 3927 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3928 << CXXCopyConstructor; 3929 CD->setInvalidDecl(); 3930 } 3931 } 3932} 3933 3934void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3935 assert(MD->isExplicitlyDefaulted()); 3936 3937 // Whether this was the first-declared instance of the operator 3938 bool First = MD == MD->getCanonicalDecl(); 3939 3940 bool HadError = false; 3941 if (MD->getNumParams() != 1) { 3942 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3943 << MD->getSourceRange(); 3944 HadError = true; 3945 } 3946 3947 QualType ReturnType = 3948 MD->getType()->getAs<FunctionType>()->getResultType(); 3949 if (!ReturnType->isLValueReferenceType() || 3950 !Context.hasSameType( 3951 Context.getCanonicalType(ReturnType->getPointeeType()), 3952 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3953 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3954 HadError = true; 3955 } 3956 3957 ImplicitExceptionSpecification Spec(Context); 3958 bool Const; 3959 llvm::tie(Spec, Const) = 3960 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3961 3962 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3963 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3964 *ExceptionType = Context.getFunctionType( 3965 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3966 3967 QualType ArgType = OperType->getArgType(0); 3968 if (!ArgType->isLValueReferenceType()) { 3969 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3970 HadError = true; 3971 } else { 3972 if (ArgType->getPointeeType().isVolatileQualified()) { 3973 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3974 HadError = true; 3975 } 3976 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3977 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3978 HadError = true; 3979 } 3980 } 3981 3982 if (OperType->getTypeQuals()) { 3983 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3984 HadError = true; 3985 } 3986 3987 if (OperType->hasExceptionSpec()) { 3988 if (CheckEquivalentExceptionSpec( 3989 PDiag(diag::err_incorrect_defaulted_exception_spec) 3990 << CXXCopyAssignment, 3991 PDiag(), 3992 ExceptionType, SourceLocation(), 3993 OperType, MD->getLocation())) { 3994 HadError = true; 3995 } 3996 } 3997 if (First) { 3998 // We set the declaration to have the computed exception spec here. 3999 // We duplicate the one parameter type. 4000 EPI.RefQualifier = OperType->getRefQualifier(); 4001 EPI.ExtInfo = OperType->getExtInfo(); 4002 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4003 } 4004 4005 if (HadError) { 4006 MD->setInvalidDecl(); 4007 return; 4008 } 4009 4010 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4011 if (First) { 4012 MD->setDeletedAsWritten(); 4013 } else { 4014 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4015 << CXXCopyAssignment; 4016 MD->setInvalidDecl(); 4017 } 4018 } 4019} 4020 4021void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4022 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4023 4024 // Whether this was the first-declared instance of the constructor. 4025 bool First = CD == CD->getCanonicalDecl(); 4026 4027 bool HadError = false; 4028 if (CD->getNumParams() != 1) { 4029 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4030 << CD->getSourceRange(); 4031 HadError = true; 4032 } 4033 4034 ImplicitExceptionSpecification Spec( 4035 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4036 4037 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4038 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4039 *ExceptionType = Context.getFunctionType( 4040 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4041 4042 // Check for parameter type matching. 4043 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4044 QualType ArgType = CtorType->getArgType(0); 4045 if (ArgType->getPointeeType().isVolatileQualified()) { 4046 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4047 HadError = true; 4048 } 4049 if (ArgType->getPointeeType().isConstQualified()) { 4050 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4051 HadError = true; 4052 } 4053 4054 // C++11 [dcl.fct.def.default]p2: 4055 // An explicitly-defaulted function may be declared constexpr only if it 4056 // would have been implicitly declared as constexpr, 4057 if (CD->isConstexpr()) { 4058 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4059 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4060 << CXXMoveConstructor; 4061 HadError = true; 4062 } 4063 } 4064 // and may have an explicit exception-specification only if it is compatible 4065 // with the exception-specification on the implicit declaration. 4066 if (CtorType->hasExceptionSpec()) { 4067 if (CheckEquivalentExceptionSpec( 4068 PDiag(diag::err_incorrect_defaulted_exception_spec) 4069 << CXXMoveConstructor, 4070 PDiag(), 4071 ExceptionType, SourceLocation(), 4072 CtorType, CD->getLocation())) { 4073 HadError = true; 4074 } 4075 } 4076 4077 // If a function is explicitly defaulted on its first declaration, 4078 if (First) { 4079 // -- it is implicitly considered to be constexpr if the implicit 4080 // definition would be, 4081 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4082 4083 // -- it is implicitly considered to have the same 4084 // exception-specification as if it had been implicitly declared, and 4085 // 4086 // FIXME: a compatible, but different, explicit exception specification 4087 // will be silently overridden. We should issue a warning if this happens. 4088 EPI.ExtInfo = CtorType->getExtInfo(); 4089 4090 // -- [...] it shall have the same parameter type as if it had been 4091 // implicitly declared. 4092 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4093 } 4094 4095 if (HadError) { 4096 CD->setInvalidDecl(); 4097 return; 4098 } 4099 4100 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4101 if (First) { 4102 CD->setDeletedAsWritten(); 4103 } else { 4104 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4105 << CXXMoveConstructor; 4106 CD->setInvalidDecl(); 4107 } 4108 } 4109} 4110 4111void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4112 assert(MD->isExplicitlyDefaulted()); 4113 4114 // Whether this was the first-declared instance of the operator 4115 bool First = MD == MD->getCanonicalDecl(); 4116 4117 bool HadError = false; 4118 if (MD->getNumParams() != 1) { 4119 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4120 << MD->getSourceRange(); 4121 HadError = true; 4122 } 4123 4124 QualType ReturnType = 4125 MD->getType()->getAs<FunctionType>()->getResultType(); 4126 if (!ReturnType->isLValueReferenceType() || 4127 !Context.hasSameType( 4128 Context.getCanonicalType(ReturnType->getPointeeType()), 4129 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4130 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4131 HadError = true; 4132 } 4133 4134 ImplicitExceptionSpecification Spec( 4135 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4136 4137 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4138 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4139 *ExceptionType = Context.getFunctionType( 4140 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4141 4142 QualType ArgType = OperType->getArgType(0); 4143 if (!ArgType->isRValueReferenceType()) { 4144 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4145 HadError = true; 4146 } else { 4147 if (ArgType->getPointeeType().isVolatileQualified()) { 4148 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4149 HadError = true; 4150 } 4151 if (ArgType->getPointeeType().isConstQualified()) { 4152 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4153 HadError = true; 4154 } 4155 } 4156 4157 if (OperType->getTypeQuals()) { 4158 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4159 HadError = true; 4160 } 4161 4162 if (OperType->hasExceptionSpec()) { 4163 if (CheckEquivalentExceptionSpec( 4164 PDiag(diag::err_incorrect_defaulted_exception_spec) 4165 << CXXMoveAssignment, 4166 PDiag(), 4167 ExceptionType, SourceLocation(), 4168 OperType, MD->getLocation())) { 4169 HadError = true; 4170 } 4171 } 4172 if (First) { 4173 // We set the declaration to have the computed exception spec here. 4174 // We duplicate the one parameter type. 4175 EPI.RefQualifier = OperType->getRefQualifier(); 4176 EPI.ExtInfo = OperType->getExtInfo(); 4177 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4178 } 4179 4180 if (HadError) { 4181 MD->setInvalidDecl(); 4182 return; 4183 } 4184 4185 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4186 if (First) { 4187 MD->setDeletedAsWritten(); 4188 } else { 4189 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4190 << CXXMoveAssignment; 4191 MD->setInvalidDecl(); 4192 } 4193 } 4194} 4195 4196void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4197 assert(DD->isExplicitlyDefaulted()); 4198 4199 // Whether this was the first-declared instance of the destructor. 4200 bool First = DD == DD->getCanonicalDecl(); 4201 4202 ImplicitExceptionSpecification Spec 4203 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4204 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4205 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4206 *ExceptionType = Context.getFunctionType( 4207 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4208 4209 if (DtorType->hasExceptionSpec()) { 4210 if (CheckEquivalentExceptionSpec( 4211 PDiag(diag::err_incorrect_defaulted_exception_spec) 4212 << CXXDestructor, 4213 PDiag(), 4214 ExceptionType, SourceLocation(), 4215 DtorType, DD->getLocation())) { 4216 DD->setInvalidDecl(); 4217 return; 4218 } 4219 } 4220 if (First) { 4221 // We set the declaration to have the computed exception spec here. 4222 // There are no parameters. 4223 EPI.ExtInfo = DtorType->getExtInfo(); 4224 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4225 } 4226 4227 if (ShouldDeleteDestructor(DD)) { 4228 if (First) { 4229 DD->setDeletedAsWritten(); 4230 } else { 4231 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4232 << CXXDestructor; 4233 DD->setInvalidDecl(); 4234 } 4235 } 4236} 4237 4238/// This function implements the following C++0x paragraphs: 4239/// - [class.ctor]/5 4240/// - [class.copy]/11 4241bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4242 assert(!MD->isInvalidDecl()); 4243 CXXRecordDecl *RD = MD->getParent(); 4244 assert(!RD->isDependentType() && "do deletion after instantiation"); 4245 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4246 return false; 4247 4248 bool IsUnion = RD->isUnion(); 4249 bool IsConstructor = false; 4250 bool IsAssignment = false; 4251 bool IsMove = false; 4252 4253 bool ConstArg = false; 4254 4255 switch (CSM) { 4256 case CXXDefaultConstructor: 4257 IsConstructor = true; 4258 break; 4259 case CXXCopyConstructor: 4260 IsConstructor = true; 4261 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4262 break; 4263 case CXXMoveConstructor: 4264 IsConstructor = true; 4265 IsMove = true; 4266 break; 4267 default: 4268 llvm_unreachable("function only currently implemented for default ctors"); 4269 } 4270 4271 SourceLocation Loc = MD->getLocation(); 4272 4273 // Do access control from the special member function 4274 ContextRAII MethodContext(*this, MD); 4275 4276 bool AllConst = true; 4277 4278 // We do this because we should never actually use an anonymous 4279 // union's constructor. 4280 if (IsUnion && RD->isAnonymousStructOrUnion()) 4281 return false; 4282 4283 // FIXME: We should put some diagnostic logic right into this function. 4284 4285 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4286 BE = RD->bases_end(); 4287 BI != BE; ++BI) { 4288 // We'll handle this one later 4289 if (BI->isVirtual()) 4290 continue; 4291 4292 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4293 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4294 4295 // Unless we have an assignment operator, the base's destructor must 4296 // be accessible and not deleted. 4297 if (!IsAssignment) { 4298 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4299 if (BaseDtor->isDeleted()) 4300 return true; 4301 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4302 AR_accessible) 4303 return true; 4304 } 4305 4306 // Finding the corresponding member in the base should lead to a 4307 // unique, accessible, non-deleted function. If we are doing 4308 // a destructor, we have already checked this case. 4309 if (CSM != CXXDestructor) { 4310 SpecialMemberOverloadResult *SMOR = 4311 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4312 false); 4313 if (!SMOR->hasSuccess()) 4314 return true; 4315 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4316 if (IsConstructor) { 4317 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4318 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4319 PDiag()) != AR_accessible) 4320 return true; 4321 4322 // For a move operation, the corresponding operation must actually 4323 // be a move operation (and not a copy selected by overload 4324 // resolution) unless we are working on a trivially copyable class. 4325 if (IsMove && !BaseCtor->isMoveConstructor() && 4326 !BaseDecl->isTriviallyCopyable()) 4327 return true; 4328 } 4329 } 4330 } 4331 4332 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4333 BE = RD->vbases_end(); 4334 BI != BE; ++BI) { 4335 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4336 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4337 4338 // Unless we have an assignment operator, the base's destructor must 4339 // be accessible and not deleted. 4340 if (!IsAssignment) { 4341 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4342 if (BaseDtor->isDeleted()) 4343 return true; 4344 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4345 AR_accessible) 4346 return true; 4347 } 4348 4349 // Finding the corresponding member in the base should lead to a 4350 // unique, accessible, non-deleted function. 4351 if (CSM != CXXDestructor) { 4352 SpecialMemberOverloadResult *SMOR = 4353 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4354 false); 4355 if (!SMOR->hasSuccess()) 4356 return true; 4357 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4358 if (IsConstructor) { 4359 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4360 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4361 PDiag()) != AR_accessible) 4362 return true; 4363 4364 // For a move operation, the corresponding operation must actually 4365 // be a move operation (and not a copy selected by overload 4366 // resolution) unless we are working on a trivially copyable class. 4367 if (IsMove && !BaseCtor->isMoveConstructor() && 4368 !BaseDecl->isTriviallyCopyable()) 4369 return true; 4370 } 4371 } 4372 } 4373 4374 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4375 FE = RD->field_end(); 4376 FI != FE; ++FI) { 4377 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4378 continue; 4379 4380 QualType FieldType = Context.getBaseElementType(FI->getType()); 4381 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4382 4383 // For a default constructor, all references must be initialized in-class 4384 // and, if a union, it must have a non-const member. 4385 if (CSM == CXXDefaultConstructor) { 4386 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4387 return true; 4388 4389 if (IsUnion && !FieldType.isConstQualified()) 4390 AllConst = false; 4391 // For a copy constructor, data members must not be of rvalue reference 4392 // type. 4393 } else if (CSM == CXXCopyConstructor) { 4394 if (FieldType->isRValueReferenceType()) 4395 return true; 4396 } 4397 4398 if (FieldRecord) { 4399 // For a default constructor, a const member must have a user-provided 4400 // default constructor or else be explicitly initialized. 4401 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4402 !FI->hasInClassInitializer() && 4403 !FieldRecord->hasUserProvidedDefaultConstructor()) 4404 return true; 4405 4406 // Some additional restrictions exist on the variant members. 4407 if (!IsUnion && FieldRecord->isUnion() && 4408 FieldRecord->isAnonymousStructOrUnion()) { 4409 // We're okay to reuse AllConst here since we only care about the 4410 // value otherwise if we're in a union. 4411 AllConst = true; 4412 4413 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4414 UE = FieldRecord->field_end(); 4415 UI != UE; ++UI) { 4416 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4417 CXXRecordDecl *UnionFieldRecord = 4418 UnionFieldType->getAsCXXRecordDecl(); 4419 4420 if (!UnionFieldType.isConstQualified()) 4421 AllConst = false; 4422 4423 if (UnionFieldRecord) { 4424 // FIXME: Checking for accessibility and validity of this 4425 // destructor is technically going beyond the 4426 // standard, but this is believed to be a defect. 4427 if (!IsAssignment) { 4428 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4429 if (FieldDtor->isDeleted()) 4430 return true; 4431 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4432 AR_accessible) 4433 return true; 4434 if (!FieldDtor->isTrivial()) 4435 return true; 4436 } 4437 4438 if (CSM != CXXDestructor) { 4439 SpecialMemberOverloadResult *SMOR = 4440 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4441 false, false, false); 4442 // FIXME: Checking for accessibility and validity of this 4443 // corresponding member is technically going beyond the 4444 // standard, but this is believed to be a defect. 4445 if (!SMOR->hasSuccess()) 4446 return true; 4447 4448 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4449 // A member of a union must have a trivial corresponding 4450 // constructor. 4451 if (!FieldMember->isTrivial()) 4452 return true; 4453 4454 if (IsConstructor) { 4455 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4456 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4457 PDiag()) != AR_accessible) 4458 return true; 4459 } 4460 } 4461 } 4462 } 4463 4464 // At least one member in each anonymous union must be non-const 4465 if (CSM == CXXDefaultConstructor && AllConst) 4466 return true; 4467 4468 // Don't try to initialize the anonymous union 4469 // This is technically non-conformant, but sanity demands it. 4470 continue; 4471 } 4472 4473 // Unless we're doing assignment, the field's destructor must be 4474 // accessible and not deleted. 4475 if (!IsAssignment) { 4476 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4477 if (FieldDtor->isDeleted()) 4478 return true; 4479 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4480 AR_accessible) 4481 return true; 4482 } 4483 4484 // Check that the corresponding member of the field is accessible, 4485 // unique, and non-deleted. We don't do this if it has an explicit 4486 // initialization when default-constructing. 4487 if (CSM != CXXDestructor && 4488 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4489 SpecialMemberOverloadResult *SMOR = 4490 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4491 false); 4492 if (!SMOR->hasSuccess()) 4493 return true; 4494 4495 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4496 if (IsConstructor) { 4497 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4498 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4499 PDiag()) != AR_accessible) 4500 return true; 4501 4502 // For a move operation, the corresponding operation must actually 4503 // be a move operation (and not a copy selected by overload 4504 // resolution) unless we are working on a trivially copyable class. 4505 if (IsMove && !FieldCtor->isMoveConstructor() && 4506 !FieldRecord->isTriviallyCopyable()) 4507 return true; 4508 } 4509 4510 // We need the corresponding member of a union to be trivial so that 4511 // we can safely copy them all simultaneously. 4512 // FIXME: Note that performing the check here (where we rely on the lack 4513 // of an in-class initializer) is technically ill-formed. However, this 4514 // seems most obviously to be a bug in the standard. 4515 if (IsUnion && !FieldMember->isTrivial()) 4516 return true; 4517 } 4518 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4519 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4520 // We can't initialize a const member of non-class type to any value. 4521 return true; 4522 } 4523 } 4524 4525 // We can't have all const members in a union when default-constructing, 4526 // or else they're all nonsensical garbage values that can't be changed. 4527 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4528 return true; 4529 4530 return false; 4531} 4532 4533bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4534 CXXRecordDecl *RD = MD->getParent(); 4535 assert(!RD->isDependentType() && "do deletion after instantiation"); 4536 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4537 return false; 4538 4539 SourceLocation Loc = MD->getLocation(); 4540 4541 // Do access control from the constructor 4542 ContextRAII MethodContext(*this, MD); 4543 4544 bool Union = RD->isUnion(); 4545 4546 unsigned ArgQuals = 4547 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4548 Qualifiers::Const : 0; 4549 4550 // We do this because we should never actually use an anonymous 4551 // union's constructor. 4552 if (Union && RD->isAnonymousStructOrUnion()) 4553 return false; 4554 4555 // FIXME: We should put some diagnostic logic right into this function. 4556 4557 // C++0x [class.copy]/20 4558 // A defaulted [copy] assignment operator for class X is defined as deleted 4559 // if X has: 4560 4561 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4562 BE = RD->bases_end(); 4563 BI != BE; ++BI) { 4564 // We'll handle this one later 4565 if (BI->isVirtual()) 4566 continue; 4567 4568 QualType BaseType = BI->getType(); 4569 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4570 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4571 4572 // -- a [direct base class] B that cannot be [copied] because overload 4573 // resolution, as applied to B's [copy] assignment operator, results in 4574 // an ambiguity or a function that is deleted or inaccessible from the 4575 // assignment operator 4576 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4577 0); 4578 if (!CopyOper || CopyOper->isDeleted()) 4579 return true; 4580 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4581 return true; 4582 } 4583 4584 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4585 BE = RD->vbases_end(); 4586 BI != BE; ++BI) { 4587 QualType BaseType = BI->getType(); 4588 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4589 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4590 4591 // -- a [virtual base class] B that cannot be [copied] because overload 4592 // resolution, as applied to B's [copy] assignment operator, results in 4593 // an ambiguity or a function that is deleted or inaccessible from the 4594 // assignment operator 4595 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4596 0); 4597 if (!CopyOper || CopyOper->isDeleted()) 4598 return true; 4599 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4600 return true; 4601 } 4602 4603 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4604 FE = RD->field_end(); 4605 FI != FE; ++FI) { 4606 if (FI->isUnnamedBitfield()) 4607 continue; 4608 4609 QualType FieldType = Context.getBaseElementType(FI->getType()); 4610 4611 // -- a non-static data member of reference type 4612 if (FieldType->isReferenceType()) 4613 return true; 4614 4615 // -- a non-static data member of const non-class type (or array thereof) 4616 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4617 return true; 4618 4619 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4620 4621 if (FieldRecord) { 4622 // This is an anonymous union 4623 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4624 // Anonymous unions inside unions do not variant members create 4625 if (!Union) { 4626 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4627 UE = FieldRecord->field_end(); 4628 UI != UE; ++UI) { 4629 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4630 CXXRecordDecl *UnionFieldRecord = 4631 UnionFieldType->getAsCXXRecordDecl(); 4632 4633 // -- a variant member with a non-trivial [copy] assignment operator 4634 // and X is a union-like class 4635 if (UnionFieldRecord && 4636 !UnionFieldRecord->hasTrivialCopyAssignment()) 4637 return true; 4638 } 4639 } 4640 4641 // Don't try to initalize an anonymous union 4642 continue; 4643 // -- a variant member with a non-trivial [copy] assignment operator 4644 // and X is a union-like class 4645 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4646 return true; 4647 } 4648 4649 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4650 false, 0); 4651 if (!CopyOper || CopyOper->isDeleted()) 4652 return true; 4653 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4654 return true; 4655 } 4656 } 4657 4658 return false; 4659} 4660 4661bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4662 CXXRecordDecl *RD = MD->getParent(); 4663 assert(!RD->isDependentType() && "do deletion after instantiation"); 4664 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4665 return false; 4666 4667 SourceLocation Loc = MD->getLocation(); 4668 4669 // Do access control from the constructor 4670 ContextRAII MethodContext(*this, MD); 4671 4672 bool Union = RD->isUnion(); 4673 4674 // We do this because we should never actually use an anonymous 4675 // union's constructor. 4676 if (Union && RD->isAnonymousStructOrUnion()) 4677 return false; 4678 4679 // C++0x [class.copy]/20 4680 // A defaulted [move] assignment operator for class X is defined as deleted 4681 // if X has: 4682 4683 // -- for the move constructor, [...] any direct or indirect virtual base 4684 // class. 4685 if (RD->getNumVBases() != 0) 4686 return true; 4687 4688 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4689 BE = RD->bases_end(); 4690 BI != BE; ++BI) { 4691 4692 QualType BaseType = BI->getType(); 4693 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4694 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4695 4696 // -- a [direct base class] B that cannot be [moved] because overload 4697 // resolution, as applied to B's [move] assignment operator, results in 4698 // an ambiguity or a function that is deleted or inaccessible from the 4699 // assignment operator 4700 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4701 if (!MoveOper || MoveOper->isDeleted()) 4702 return true; 4703 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4704 return true; 4705 4706 // -- for the move assignment operator, a [direct base class] with a type 4707 // that does not have a move assignment operator and is not trivially 4708 // copyable. 4709 if (!MoveOper->isMoveAssignmentOperator() && 4710 !BaseDecl->isTriviallyCopyable()) 4711 return true; 4712 } 4713 4714 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4715 FE = RD->field_end(); 4716 FI != FE; ++FI) { 4717 if (FI->isUnnamedBitfield()) 4718 continue; 4719 4720 QualType FieldType = Context.getBaseElementType(FI->getType()); 4721 4722 // -- a non-static data member of reference type 4723 if (FieldType->isReferenceType()) 4724 return true; 4725 4726 // -- a non-static data member of const non-class type (or array thereof) 4727 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4728 return true; 4729 4730 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4731 4732 if (FieldRecord) { 4733 // This is an anonymous union 4734 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4735 // Anonymous unions inside unions do not variant members create 4736 if (!Union) { 4737 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4738 UE = FieldRecord->field_end(); 4739 UI != UE; ++UI) { 4740 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4741 CXXRecordDecl *UnionFieldRecord = 4742 UnionFieldType->getAsCXXRecordDecl(); 4743 4744 // -- a variant member with a non-trivial [move] assignment operator 4745 // and X is a union-like class 4746 if (UnionFieldRecord && 4747 !UnionFieldRecord->hasTrivialMoveAssignment()) 4748 return true; 4749 } 4750 } 4751 4752 // Don't try to initalize an anonymous union 4753 continue; 4754 // -- a variant member with a non-trivial [move] assignment operator 4755 // and X is a union-like class 4756 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4757 return true; 4758 } 4759 4760 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4761 if (!MoveOper || MoveOper->isDeleted()) 4762 return true; 4763 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4764 return true; 4765 4766 // -- for the move assignment operator, a [non-static data member] with a 4767 // type that does not have a move assignment operator and is not 4768 // trivially copyable. 4769 if (!MoveOper->isMoveAssignmentOperator() && 4770 !FieldRecord->isTriviallyCopyable()) 4771 return true; 4772 } 4773 } 4774 4775 return false; 4776} 4777 4778bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4779 CXXRecordDecl *RD = DD->getParent(); 4780 assert(!RD->isDependentType() && "do deletion after instantiation"); 4781 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4782 return false; 4783 4784 SourceLocation Loc = DD->getLocation(); 4785 4786 // Do access control from the destructor 4787 ContextRAII CtorContext(*this, DD); 4788 4789 bool Union = RD->isUnion(); 4790 4791 // We do this because we should never actually use an anonymous 4792 // union's destructor. 4793 if (Union && RD->isAnonymousStructOrUnion()) 4794 return false; 4795 4796 // C++0x [class.dtor]p5 4797 // A defaulted destructor for a class X is defined as deleted if: 4798 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4799 BE = RD->bases_end(); 4800 BI != BE; ++BI) { 4801 // We'll handle this one later 4802 if (BI->isVirtual()) 4803 continue; 4804 4805 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4806 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4807 assert(BaseDtor && "base has no destructor"); 4808 4809 // -- any direct or virtual base class has a deleted destructor or 4810 // a destructor that is inaccessible from the defaulted destructor 4811 if (BaseDtor->isDeleted()) 4812 return true; 4813 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4814 AR_accessible) 4815 return true; 4816 } 4817 4818 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4819 BE = RD->vbases_end(); 4820 BI != BE; ++BI) { 4821 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4822 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4823 assert(BaseDtor && "base has no destructor"); 4824 4825 // -- any direct or virtual base class has a deleted destructor or 4826 // a destructor that is inaccessible from the defaulted destructor 4827 if (BaseDtor->isDeleted()) 4828 return true; 4829 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4830 AR_accessible) 4831 return true; 4832 } 4833 4834 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4835 FE = RD->field_end(); 4836 FI != FE; ++FI) { 4837 QualType FieldType = Context.getBaseElementType(FI->getType()); 4838 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4839 if (FieldRecord) { 4840 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4841 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4842 UE = FieldRecord->field_end(); 4843 UI != UE; ++UI) { 4844 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4845 CXXRecordDecl *UnionFieldRecord = 4846 UnionFieldType->getAsCXXRecordDecl(); 4847 4848 // -- X is a union-like class that has a variant member with a non- 4849 // trivial destructor. 4850 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4851 return true; 4852 } 4853 // Technically we are supposed to do this next check unconditionally. 4854 // But that makes absolutely no sense. 4855 } else { 4856 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4857 4858 // -- any of the non-static data members has class type M (or array 4859 // thereof) and M has a deleted destructor or a destructor that is 4860 // inaccessible from the defaulted destructor 4861 if (FieldDtor->isDeleted()) 4862 return true; 4863 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4864 AR_accessible) 4865 return true; 4866 4867 // -- X is a union-like class that has a variant member with a non- 4868 // trivial destructor. 4869 if (Union && !FieldDtor->isTrivial()) 4870 return true; 4871 } 4872 } 4873 } 4874 4875 if (DD->isVirtual()) { 4876 FunctionDecl *OperatorDelete = 0; 4877 DeclarationName Name = 4878 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4879 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4880 false)) 4881 return true; 4882 } 4883 4884 4885 return false; 4886} 4887 4888/// \brief Data used with FindHiddenVirtualMethod 4889namespace { 4890 struct FindHiddenVirtualMethodData { 4891 Sema *S; 4892 CXXMethodDecl *Method; 4893 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4894 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4895 }; 4896} 4897 4898/// \brief Member lookup function that determines whether a given C++ 4899/// method overloads virtual methods in a base class without overriding any, 4900/// to be used with CXXRecordDecl::lookupInBases(). 4901static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4902 CXXBasePath &Path, 4903 void *UserData) { 4904 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4905 4906 FindHiddenVirtualMethodData &Data 4907 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4908 4909 DeclarationName Name = Data.Method->getDeclName(); 4910 assert(Name.getNameKind() == DeclarationName::Identifier); 4911 4912 bool foundSameNameMethod = false; 4913 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4914 for (Path.Decls = BaseRecord->lookup(Name); 4915 Path.Decls.first != Path.Decls.second; 4916 ++Path.Decls.first) { 4917 NamedDecl *D = *Path.Decls.first; 4918 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4919 MD = MD->getCanonicalDecl(); 4920 foundSameNameMethod = true; 4921 // Interested only in hidden virtual methods. 4922 if (!MD->isVirtual()) 4923 continue; 4924 // If the method we are checking overrides a method from its base 4925 // don't warn about the other overloaded methods. 4926 if (!Data.S->IsOverload(Data.Method, MD, false)) 4927 return true; 4928 // Collect the overload only if its hidden. 4929 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4930 overloadedMethods.push_back(MD); 4931 } 4932 } 4933 4934 if (foundSameNameMethod) 4935 Data.OverloadedMethods.append(overloadedMethods.begin(), 4936 overloadedMethods.end()); 4937 return foundSameNameMethod; 4938} 4939 4940/// \brief See if a method overloads virtual methods in a base class without 4941/// overriding any. 4942void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4943 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4944 MD->getLocation()) == DiagnosticsEngine::Ignored) 4945 return; 4946 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4947 return; 4948 4949 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4950 /*bool RecordPaths=*/false, 4951 /*bool DetectVirtual=*/false); 4952 FindHiddenVirtualMethodData Data; 4953 Data.Method = MD; 4954 Data.S = this; 4955 4956 // Keep the base methods that were overriden or introduced in the subclass 4957 // by 'using' in a set. A base method not in this set is hidden. 4958 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4959 res.first != res.second; ++res.first) { 4960 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4961 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4962 E = MD->end_overridden_methods(); 4963 I != E; ++I) 4964 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4965 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4966 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4967 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4968 } 4969 4970 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4971 !Data.OverloadedMethods.empty()) { 4972 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4973 << MD << (Data.OverloadedMethods.size() > 1); 4974 4975 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4976 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4977 Diag(overloadedMD->getLocation(), 4978 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4979 } 4980 } 4981} 4982 4983void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4984 Decl *TagDecl, 4985 SourceLocation LBrac, 4986 SourceLocation RBrac, 4987 AttributeList *AttrList) { 4988 if (!TagDecl) 4989 return; 4990 4991 AdjustDeclIfTemplate(TagDecl); 4992 4993 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4994 // strict aliasing violation! 4995 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4996 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4997 4998 CheckCompletedCXXClass( 4999 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5000} 5001 5002/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5003/// special functions, such as the default constructor, copy 5004/// constructor, or destructor, to the given C++ class (C++ 5005/// [special]p1). This routine can only be executed just before the 5006/// definition of the class is complete. 5007void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5008 if (!ClassDecl->hasUserDeclaredConstructor()) 5009 ++ASTContext::NumImplicitDefaultConstructors; 5010 5011 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5012 ++ASTContext::NumImplicitCopyConstructors; 5013 5014 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5015 ++ASTContext::NumImplicitMoveConstructors; 5016 5017 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5018 ++ASTContext::NumImplicitCopyAssignmentOperators; 5019 5020 // If we have a dynamic class, then the copy assignment operator may be 5021 // virtual, so we have to declare it immediately. This ensures that, e.g., 5022 // it shows up in the right place in the vtable and that we diagnose 5023 // problems with the implicit exception specification. 5024 if (ClassDecl->isDynamicClass()) 5025 DeclareImplicitCopyAssignment(ClassDecl); 5026 } 5027 5028 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5029 ++ASTContext::NumImplicitMoveAssignmentOperators; 5030 5031 // Likewise for the move assignment operator. 5032 if (ClassDecl->isDynamicClass()) 5033 DeclareImplicitMoveAssignment(ClassDecl); 5034 } 5035 5036 if (!ClassDecl->hasUserDeclaredDestructor()) { 5037 ++ASTContext::NumImplicitDestructors; 5038 5039 // If we have a dynamic class, then the destructor may be virtual, so we 5040 // have to declare the destructor immediately. This ensures that, e.g., it 5041 // shows up in the right place in the vtable and that we diagnose problems 5042 // with the implicit exception specification. 5043 if (ClassDecl->isDynamicClass()) 5044 DeclareImplicitDestructor(ClassDecl); 5045 } 5046} 5047 5048void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5049 if (!D) 5050 return; 5051 5052 int NumParamList = D->getNumTemplateParameterLists(); 5053 for (int i = 0; i < NumParamList; i++) { 5054 TemplateParameterList* Params = D->getTemplateParameterList(i); 5055 for (TemplateParameterList::iterator Param = Params->begin(), 5056 ParamEnd = Params->end(); 5057 Param != ParamEnd; ++Param) { 5058 NamedDecl *Named = cast<NamedDecl>(*Param); 5059 if (Named->getDeclName()) { 5060 S->AddDecl(Named); 5061 IdResolver.AddDecl(Named); 5062 } 5063 } 5064 } 5065} 5066 5067void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5068 if (!D) 5069 return; 5070 5071 TemplateParameterList *Params = 0; 5072 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5073 Params = Template->getTemplateParameters(); 5074 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5075 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5076 Params = PartialSpec->getTemplateParameters(); 5077 else 5078 return; 5079 5080 for (TemplateParameterList::iterator Param = Params->begin(), 5081 ParamEnd = Params->end(); 5082 Param != ParamEnd; ++Param) { 5083 NamedDecl *Named = cast<NamedDecl>(*Param); 5084 if (Named->getDeclName()) { 5085 S->AddDecl(Named); 5086 IdResolver.AddDecl(Named); 5087 } 5088 } 5089} 5090 5091void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5092 if (!RecordD) return; 5093 AdjustDeclIfTemplate(RecordD); 5094 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5095 PushDeclContext(S, Record); 5096} 5097 5098void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5099 if (!RecordD) return; 5100 PopDeclContext(); 5101} 5102 5103/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5104/// parsing a top-level (non-nested) C++ class, and we are now 5105/// parsing those parts of the given Method declaration that could 5106/// not be parsed earlier (C++ [class.mem]p2), such as default 5107/// arguments. This action should enter the scope of the given 5108/// Method declaration as if we had just parsed the qualified method 5109/// name. However, it should not bring the parameters into scope; 5110/// that will be performed by ActOnDelayedCXXMethodParameter. 5111void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5112} 5113 5114/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5115/// C++ method declaration. We're (re-)introducing the given 5116/// function parameter into scope for use in parsing later parts of 5117/// the method declaration. For example, we could see an 5118/// ActOnParamDefaultArgument event for this parameter. 5119void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5120 if (!ParamD) 5121 return; 5122 5123 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5124 5125 // If this parameter has an unparsed default argument, clear it out 5126 // to make way for the parsed default argument. 5127 if (Param->hasUnparsedDefaultArg()) 5128 Param->setDefaultArg(0); 5129 5130 S->AddDecl(Param); 5131 if (Param->getDeclName()) 5132 IdResolver.AddDecl(Param); 5133} 5134 5135/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5136/// processing the delayed method declaration for Method. The method 5137/// declaration is now considered finished. There may be a separate 5138/// ActOnStartOfFunctionDef action later (not necessarily 5139/// immediately!) for this method, if it was also defined inside the 5140/// class body. 5141void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5142 if (!MethodD) 5143 return; 5144 5145 AdjustDeclIfTemplate(MethodD); 5146 5147 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5148 5149 // Now that we have our default arguments, check the constructor 5150 // again. It could produce additional diagnostics or affect whether 5151 // the class has implicitly-declared destructors, among other 5152 // things. 5153 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5154 CheckConstructor(Constructor); 5155 5156 // Check the default arguments, which we may have added. 5157 if (!Method->isInvalidDecl()) 5158 CheckCXXDefaultArguments(Method); 5159} 5160 5161/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5162/// the well-formedness of the constructor declarator @p D with type @p 5163/// R. If there are any errors in the declarator, this routine will 5164/// emit diagnostics and set the invalid bit to true. In any case, the type 5165/// will be updated to reflect a well-formed type for the constructor and 5166/// returned. 5167QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5168 StorageClass &SC) { 5169 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5170 5171 // C++ [class.ctor]p3: 5172 // A constructor shall not be virtual (10.3) or static (9.4). A 5173 // constructor can be invoked for a const, volatile or const 5174 // volatile object. A constructor shall not be declared const, 5175 // volatile, or const volatile (9.3.2). 5176 if (isVirtual) { 5177 if (!D.isInvalidType()) 5178 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5179 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5180 << SourceRange(D.getIdentifierLoc()); 5181 D.setInvalidType(); 5182 } 5183 if (SC == SC_Static) { 5184 if (!D.isInvalidType()) 5185 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5186 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5187 << SourceRange(D.getIdentifierLoc()); 5188 D.setInvalidType(); 5189 SC = SC_None; 5190 } 5191 5192 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5193 if (FTI.TypeQuals != 0) { 5194 if (FTI.TypeQuals & Qualifiers::Const) 5195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5196 << "const" << SourceRange(D.getIdentifierLoc()); 5197 if (FTI.TypeQuals & Qualifiers::Volatile) 5198 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5199 << "volatile" << SourceRange(D.getIdentifierLoc()); 5200 if (FTI.TypeQuals & Qualifiers::Restrict) 5201 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5202 << "restrict" << SourceRange(D.getIdentifierLoc()); 5203 D.setInvalidType(); 5204 } 5205 5206 // C++0x [class.ctor]p4: 5207 // A constructor shall not be declared with a ref-qualifier. 5208 if (FTI.hasRefQualifier()) { 5209 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5210 << FTI.RefQualifierIsLValueRef 5211 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5212 D.setInvalidType(); 5213 } 5214 5215 // Rebuild the function type "R" without any type qualifiers (in 5216 // case any of the errors above fired) and with "void" as the 5217 // return type, since constructors don't have return types. 5218 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5219 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5220 return R; 5221 5222 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5223 EPI.TypeQuals = 0; 5224 EPI.RefQualifier = RQ_None; 5225 5226 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5227 Proto->getNumArgs(), EPI); 5228} 5229 5230/// CheckConstructor - Checks a fully-formed constructor for 5231/// well-formedness, issuing any diagnostics required. Returns true if 5232/// the constructor declarator is invalid. 5233void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5234 CXXRecordDecl *ClassDecl 5235 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5236 if (!ClassDecl) 5237 return Constructor->setInvalidDecl(); 5238 5239 // C++ [class.copy]p3: 5240 // A declaration of a constructor for a class X is ill-formed if 5241 // its first parameter is of type (optionally cv-qualified) X and 5242 // either there are no other parameters or else all other 5243 // parameters have default arguments. 5244 if (!Constructor->isInvalidDecl() && 5245 ((Constructor->getNumParams() == 1) || 5246 (Constructor->getNumParams() > 1 && 5247 Constructor->getParamDecl(1)->hasDefaultArg())) && 5248 Constructor->getTemplateSpecializationKind() 5249 != TSK_ImplicitInstantiation) { 5250 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5251 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5252 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5253 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5254 const char *ConstRef 5255 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5256 : " const &"; 5257 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5258 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5259 5260 // FIXME: Rather that making the constructor invalid, we should endeavor 5261 // to fix the type. 5262 Constructor->setInvalidDecl(); 5263 } 5264 } 5265} 5266 5267/// CheckDestructor - Checks a fully-formed destructor definition for 5268/// well-formedness, issuing any diagnostics required. Returns true 5269/// on error. 5270bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5271 CXXRecordDecl *RD = Destructor->getParent(); 5272 5273 if (Destructor->isVirtual()) { 5274 SourceLocation Loc; 5275 5276 if (!Destructor->isImplicit()) 5277 Loc = Destructor->getLocation(); 5278 else 5279 Loc = RD->getLocation(); 5280 5281 // If we have a virtual destructor, look up the deallocation function 5282 FunctionDecl *OperatorDelete = 0; 5283 DeclarationName Name = 5284 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5285 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5286 return true; 5287 5288 MarkDeclarationReferenced(Loc, OperatorDelete); 5289 5290 Destructor->setOperatorDelete(OperatorDelete); 5291 } 5292 5293 return false; 5294} 5295 5296static inline bool 5297FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5298 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5299 FTI.ArgInfo[0].Param && 5300 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5301} 5302 5303/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5304/// the well-formednes of the destructor declarator @p D with type @p 5305/// R. If there are any errors in the declarator, this routine will 5306/// emit diagnostics and set the declarator to invalid. Even if this happens, 5307/// will be updated to reflect a well-formed type for the destructor and 5308/// returned. 5309QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5310 StorageClass& SC) { 5311 // C++ [class.dtor]p1: 5312 // [...] A typedef-name that names a class is a class-name 5313 // (7.1.3); however, a typedef-name that names a class shall not 5314 // be used as the identifier in the declarator for a destructor 5315 // declaration. 5316 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5317 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5318 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5319 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5320 else if (const TemplateSpecializationType *TST = 5321 DeclaratorType->getAs<TemplateSpecializationType>()) 5322 if (TST->isTypeAlias()) 5323 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5324 << DeclaratorType << 1; 5325 5326 // C++ [class.dtor]p2: 5327 // A destructor is used to destroy objects of its class type. A 5328 // destructor takes no parameters, and no return type can be 5329 // specified for it (not even void). The address of a destructor 5330 // shall not be taken. A destructor shall not be static. A 5331 // destructor can be invoked for a const, volatile or const 5332 // volatile object. A destructor shall not be declared const, 5333 // volatile or const volatile (9.3.2). 5334 if (SC == SC_Static) { 5335 if (!D.isInvalidType()) 5336 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5337 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5338 << SourceRange(D.getIdentifierLoc()) 5339 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5340 5341 SC = SC_None; 5342 } 5343 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5344 // Destructors don't have return types, but the parser will 5345 // happily parse something like: 5346 // 5347 // class X { 5348 // float ~X(); 5349 // }; 5350 // 5351 // The return type will be eliminated later. 5352 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5353 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5354 << SourceRange(D.getIdentifierLoc()); 5355 } 5356 5357 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5358 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5359 if (FTI.TypeQuals & Qualifiers::Const) 5360 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5361 << "const" << SourceRange(D.getIdentifierLoc()); 5362 if (FTI.TypeQuals & Qualifiers::Volatile) 5363 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5364 << "volatile" << SourceRange(D.getIdentifierLoc()); 5365 if (FTI.TypeQuals & Qualifiers::Restrict) 5366 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5367 << "restrict" << SourceRange(D.getIdentifierLoc()); 5368 D.setInvalidType(); 5369 } 5370 5371 // C++0x [class.dtor]p2: 5372 // A destructor shall not be declared with a ref-qualifier. 5373 if (FTI.hasRefQualifier()) { 5374 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5375 << FTI.RefQualifierIsLValueRef 5376 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5377 D.setInvalidType(); 5378 } 5379 5380 // Make sure we don't have any parameters. 5381 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5382 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5383 5384 // Delete the parameters. 5385 FTI.freeArgs(); 5386 D.setInvalidType(); 5387 } 5388 5389 // Make sure the destructor isn't variadic. 5390 if (FTI.isVariadic) { 5391 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5392 D.setInvalidType(); 5393 } 5394 5395 // Rebuild the function type "R" without any type qualifiers or 5396 // parameters (in case any of the errors above fired) and with 5397 // "void" as the return type, since destructors don't have return 5398 // types. 5399 if (!D.isInvalidType()) 5400 return R; 5401 5402 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5403 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5404 EPI.Variadic = false; 5405 EPI.TypeQuals = 0; 5406 EPI.RefQualifier = RQ_None; 5407 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5408} 5409 5410/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5411/// well-formednes of the conversion function declarator @p D with 5412/// type @p R. If there are any errors in the declarator, this routine 5413/// will emit diagnostics and return true. Otherwise, it will return 5414/// false. Either way, the type @p R will be updated to reflect a 5415/// well-formed type for the conversion operator. 5416void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5417 StorageClass& SC) { 5418 // C++ [class.conv.fct]p1: 5419 // Neither parameter types nor return type can be specified. The 5420 // type of a conversion function (8.3.5) is "function taking no 5421 // parameter returning conversion-type-id." 5422 if (SC == SC_Static) { 5423 if (!D.isInvalidType()) 5424 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5425 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5426 << SourceRange(D.getIdentifierLoc()); 5427 D.setInvalidType(); 5428 SC = SC_None; 5429 } 5430 5431 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5432 5433 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5434 // Conversion functions don't have return types, but the parser will 5435 // happily parse something like: 5436 // 5437 // class X { 5438 // float operator bool(); 5439 // }; 5440 // 5441 // The return type will be changed later anyway. 5442 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5443 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5444 << SourceRange(D.getIdentifierLoc()); 5445 D.setInvalidType(); 5446 } 5447 5448 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5449 5450 // Make sure we don't have any parameters. 5451 if (Proto->getNumArgs() > 0) { 5452 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5453 5454 // Delete the parameters. 5455 D.getFunctionTypeInfo().freeArgs(); 5456 D.setInvalidType(); 5457 } else if (Proto->isVariadic()) { 5458 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5459 D.setInvalidType(); 5460 } 5461 5462 // Diagnose "&operator bool()" and other such nonsense. This 5463 // is actually a gcc extension which we don't support. 5464 if (Proto->getResultType() != ConvType) { 5465 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5466 << Proto->getResultType(); 5467 D.setInvalidType(); 5468 ConvType = Proto->getResultType(); 5469 } 5470 5471 // C++ [class.conv.fct]p4: 5472 // The conversion-type-id shall not represent a function type nor 5473 // an array type. 5474 if (ConvType->isArrayType()) { 5475 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5476 ConvType = Context.getPointerType(ConvType); 5477 D.setInvalidType(); 5478 } else if (ConvType->isFunctionType()) { 5479 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5480 ConvType = Context.getPointerType(ConvType); 5481 D.setInvalidType(); 5482 } 5483 5484 // Rebuild the function type "R" without any parameters (in case any 5485 // of the errors above fired) and with the conversion type as the 5486 // return type. 5487 if (D.isInvalidType()) 5488 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5489 5490 // C++0x explicit conversion operators. 5491 if (D.getDeclSpec().isExplicitSpecified()) 5492 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5493 getLangOptions().CPlusPlus0x ? 5494 diag::warn_cxx98_compat_explicit_conversion_functions : 5495 diag::ext_explicit_conversion_functions) 5496 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5497} 5498 5499/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5500/// the declaration of the given C++ conversion function. This routine 5501/// is responsible for recording the conversion function in the C++ 5502/// class, if possible. 5503Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5504 assert(Conversion && "Expected to receive a conversion function declaration"); 5505 5506 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5507 5508 // Make sure we aren't redeclaring the conversion function. 5509 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5510 5511 // C++ [class.conv.fct]p1: 5512 // [...] A conversion function is never used to convert a 5513 // (possibly cv-qualified) object to the (possibly cv-qualified) 5514 // same object type (or a reference to it), to a (possibly 5515 // cv-qualified) base class of that type (or a reference to it), 5516 // or to (possibly cv-qualified) void. 5517 // FIXME: Suppress this warning if the conversion function ends up being a 5518 // virtual function that overrides a virtual function in a base class. 5519 QualType ClassType 5520 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5521 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5522 ConvType = ConvTypeRef->getPointeeType(); 5523 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5524 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5525 /* Suppress diagnostics for instantiations. */; 5526 else if (ConvType->isRecordType()) { 5527 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5528 if (ConvType == ClassType) 5529 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5530 << ClassType; 5531 else if (IsDerivedFrom(ClassType, ConvType)) 5532 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5533 << ClassType << ConvType; 5534 } else if (ConvType->isVoidType()) { 5535 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5536 << ClassType << ConvType; 5537 } 5538 5539 if (FunctionTemplateDecl *ConversionTemplate 5540 = Conversion->getDescribedFunctionTemplate()) 5541 return ConversionTemplate; 5542 5543 return Conversion; 5544} 5545 5546//===----------------------------------------------------------------------===// 5547// Namespace Handling 5548//===----------------------------------------------------------------------===// 5549 5550 5551 5552/// ActOnStartNamespaceDef - This is called at the start of a namespace 5553/// definition. 5554Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5555 SourceLocation InlineLoc, 5556 SourceLocation NamespaceLoc, 5557 SourceLocation IdentLoc, 5558 IdentifierInfo *II, 5559 SourceLocation LBrace, 5560 AttributeList *AttrList) { 5561 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5562 // For anonymous namespace, take the location of the left brace. 5563 SourceLocation Loc = II ? IdentLoc : LBrace; 5564 bool IsInline = InlineLoc.isValid(); 5565 bool IsInvalid = false; 5566 bool IsStd = false; 5567 bool AddToKnown = false; 5568 Scope *DeclRegionScope = NamespcScope->getParent(); 5569 5570 NamespaceDecl *PrevNS = 0; 5571 if (II) { 5572 // C++ [namespace.def]p2: 5573 // The identifier in an original-namespace-definition shall not 5574 // have been previously defined in the declarative region in 5575 // which the original-namespace-definition appears. The 5576 // identifier in an original-namespace-definition is the name of 5577 // the namespace. Subsequently in that declarative region, it is 5578 // treated as an original-namespace-name. 5579 // 5580 // Since namespace names are unique in their scope, and we don't 5581 // look through using directives, just look for any ordinary names. 5582 5583 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5584 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5585 Decl::IDNS_Namespace; 5586 NamedDecl *PrevDecl = 0; 5587 for (DeclContext::lookup_result R 5588 = CurContext->getRedeclContext()->lookup(II); 5589 R.first != R.second; ++R.first) { 5590 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5591 PrevDecl = *R.first; 5592 break; 5593 } 5594 } 5595 5596 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5597 5598 if (PrevNS) { 5599 // This is an extended namespace definition. 5600 if (IsInline != PrevNS->isInline()) { 5601 // inline-ness must match 5602 if (PrevNS->isInline()) { 5603 // The user probably just forgot the 'inline', so suggest that it 5604 // be added back. 5605 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5606 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5607 } else { 5608 Diag(Loc, diag::err_inline_namespace_mismatch) 5609 << IsInline; 5610 } 5611 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5612 5613 IsInline = PrevNS->isInline(); 5614 } 5615 } else if (PrevDecl) { 5616 // This is an invalid name redefinition. 5617 Diag(Loc, diag::err_redefinition_different_kind) 5618 << II; 5619 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5620 IsInvalid = true; 5621 // Continue on to push Namespc as current DeclContext and return it. 5622 } else if (II->isStr("std") && 5623 CurContext->getRedeclContext()->isTranslationUnit()) { 5624 // This is the first "real" definition of the namespace "std", so update 5625 // our cache of the "std" namespace to point at this definition. 5626 PrevNS = getStdNamespace(); 5627 IsStd = true; 5628 AddToKnown = !IsInline; 5629 } else { 5630 // We've seen this namespace for the first time. 5631 AddToKnown = !IsInline; 5632 } 5633 } else { 5634 // Anonymous namespaces. 5635 5636 // Determine whether the parent already has an anonymous namespace. 5637 DeclContext *Parent = CurContext->getRedeclContext(); 5638 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5639 PrevNS = TU->getAnonymousNamespace(); 5640 } else { 5641 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5642 PrevNS = ND->getAnonymousNamespace(); 5643 } 5644 5645 if (PrevNS && IsInline != PrevNS->isInline()) { 5646 // inline-ness must match 5647 Diag(Loc, diag::err_inline_namespace_mismatch) 5648 << IsInline; 5649 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5650 5651 // Recover by ignoring the new namespace's inline status. 5652 IsInline = PrevNS->isInline(); 5653 } 5654 } 5655 5656 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5657 StartLoc, Loc, II, PrevNS); 5658 if (IsInvalid) 5659 Namespc->setInvalidDecl(); 5660 5661 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5662 5663 // FIXME: Should we be merging attributes? 5664 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5665 PushNamespaceVisibilityAttr(Attr); 5666 5667 if (IsStd) 5668 StdNamespace = Namespc; 5669 if (AddToKnown) 5670 KnownNamespaces[Namespc] = false; 5671 5672 if (II) { 5673 PushOnScopeChains(Namespc, DeclRegionScope); 5674 } else { 5675 // Link the anonymous namespace into its parent. 5676 DeclContext *Parent = CurContext->getRedeclContext(); 5677 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5678 TU->setAnonymousNamespace(Namespc); 5679 } else { 5680 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5681 } 5682 5683 CurContext->addDecl(Namespc); 5684 5685 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5686 // behaves as if it were replaced by 5687 // namespace unique { /* empty body */ } 5688 // using namespace unique; 5689 // namespace unique { namespace-body } 5690 // where all occurrences of 'unique' in a translation unit are 5691 // replaced by the same identifier and this identifier differs 5692 // from all other identifiers in the entire program. 5693 5694 // We just create the namespace with an empty name and then add an 5695 // implicit using declaration, just like the standard suggests. 5696 // 5697 // CodeGen enforces the "universally unique" aspect by giving all 5698 // declarations semantically contained within an anonymous 5699 // namespace internal linkage. 5700 5701 if (!PrevNS) { 5702 UsingDirectiveDecl* UD 5703 = UsingDirectiveDecl::Create(Context, CurContext, 5704 /* 'using' */ LBrace, 5705 /* 'namespace' */ SourceLocation(), 5706 /* qualifier */ NestedNameSpecifierLoc(), 5707 /* identifier */ SourceLocation(), 5708 Namespc, 5709 /* Ancestor */ CurContext); 5710 UD->setImplicit(); 5711 CurContext->addDecl(UD); 5712 } 5713 } 5714 5715 // Although we could have an invalid decl (i.e. the namespace name is a 5716 // redefinition), push it as current DeclContext and try to continue parsing. 5717 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5718 // for the namespace has the declarations that showed up in that particular 5719 // namespace definition. 5720 PushDeclContext(NamespcScope, Namespc); 5721 return Namespc; 5722} 5723 5724/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5725/// is a namespace alias, returns the namespace it points to. 5726static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5727 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5728 return AD->getNamespace(); 5729 return dyn_cast_or_null<NamespaceDecl>(D); 5730} 5731 5732/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5733/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5734void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5735 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5736 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5737 Namespc->setRBraceLoc(RBrace); 5738 PopDeclContext(); 5739 if (Namespc->hasAttr<VisibilityAttr>()) 5740 PopPragmaVisibility(); 5741} 5742 5743CXXRecordDecl *Sema::getStdBadAlloc() const { 5744 return cast_or_null<CXXRecordDecl>( 5745 StdBadAlloc.get(Context.getExternalSource())); 5746} 5747 5748NamespaceDecl *Sema::getStdNamespace() const { 5749 return cast_or_null<NamespaceDecl>( 5750 StdNamespace.get(Context.getExternalSource())); 5751} 5752 5753/// \brief Retrieve the special "std" namespace, which may require us to 5754/// implicitly define the namespace. 5755NamespaceDecl *Sema::getOrCreateStdNamespace() { 5756 if (!StdNamespace) { 5757 // The "std" namespace has not yet been defined, so build one implicitly. 5758 StdNamespace = NamespaceDecl::Create(Context, 5759 Context.getTranslationUnitDecl(), 5760 /*Inline=*/false, 5761 SourceLocation(), SourceLocation(), 5762 &PP.getIdentifierTable().get("std"), 5763 /*PrevDecl=*/0); 5764 getStdNamespace()->setImplicit(true); 5765 } 5766 5767 return getStdNamespace(); 5768} 5769 5770bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5771 assert(getLangOptions().CPlusPlus && 5772 "Looking for std::initializer_list outside of C++."); 5773 5774 // We're looking for implicit instantiations of 5775 // template <typename E> class std::initializer_list. 5776 5777 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5778 return false; 5779 5780 ClassTemplateDecl *Template = 0; 5781 const TemplateArgument *Arguments = 0; 5782 5783 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5784 5785 ClassTemplateSpecializationDecl *Specialization = 5786 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5787 if (!Specialization) 5788 return false; 5789 5790 if (Specialization->getSpecializationKind() != TSK_ImplicitInstantiation) 5791 return false; 5792 5793 Template = Specialization->getSpecializedTemplate(); 5794 Arguments = Specialization->getTemplateArgs().data(); 5795 } else if (const TemplateSpecializationType *TST = 5796 Ty->getAs<TemplateSpecializationType>()) { 5797 Template = dyn_cast_or_null<ClassTemplateDecl>( 5798 TST->getTemplateName().getAsTemplateDecl()); 5799 Arguments = TST->getArgs(); 5800 } 5801 if (!Template) 5802 return false; 5803 5804 if (!StdInitializerList) { 5805 // Haven't recognized std::initializer_list yet, maybe this is it. 5806 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5807 if (TemplateClass->getIdentifier() != 5808 &PP.getIdentifierTable().get("initializer_list") || 5809 !TemplateClass->getDeclContext()->Equals(getStdNamespace())) 5810 return false; 5811 // This is a template called std::initializer_list, but is it the right 5812 // template? 5813 TemplateParameterList *Params = Template->getTemplateParameters(); 5814 if (Params->size() != 1) 5815 return false; 5816 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5817 return false; 5818 5819 // It's the right template. 5820 StdInitializerList = Template; 5821 } 5822 5823 if (Template != StdInitializerList) 5824 return false; 5825 5826 // This is an instance of std::initializer_list. Find the argument type. 5827 if (Element) 5828 *Element = Arguments[0].getAsType(); 5829 return true; 5830} 5831 5832static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5833 NamespaceDecl *Std = S.getStdNamespace(); 5834 if (!Std) { 5835 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5836 return 0; 5837 } 5838 5839 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5840 Loc, Sema::LookupOrdinaryName); 5841 if (!S.LookupQualifiedName(Result, Std)) { 5842 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5843 return 0; 5844 } 5845 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5846 if (!Template) { 5847 Result.suppressDiagnostics(); 5848 // We found something weird. Complain about the first thing we found. 5849 NamedDecl *Found = *Result.begin(); 5850 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5851 return 0; 5852 } 5853 5854 // We found some template called std::initializer_list. Now verify that it's 5855 // correct. 5856 TemplateParameterList *Params = Template->getTemplateParameters(); 5857 if (Params->size() != 1 || !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5858 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5859 return 0; 5860 } 5861 5862 return Template; 5863} 5864 5865QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5866 if (!StdInitializerList) { 5867 StdInitializerList = LookupStdInitializerList(*this, Loc); 5868 if (!StdInitializerList) 5869 return QualType(); 5870 } 5871 5872 TemplateArgumentListInfo Args(Loc, Loc); 5873 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5874 Context.getTrivialTypeSourceInfo(Element, 5875 Loc))); 5876 return Context.getCanonicalType( 5877 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5878} 5879 5880/// \brief Determine whether a using statement is in a context where it will be 5881/// apply in all contexts. 5882static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5883 switch (CurContext->getDeclKind()) { 5884 case Decl::TranslationUnit: 5885 return true; 5886 case Decl::LinkageSpec: 5887 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5888 default: 5889 return false; 5890 } 5891} 5892 5893namespace { 5894 5895// Callback to only accept typo corrections that are namespaces. 5896class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5897 public: 5898 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5899 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5900 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5901 } 5902 return false; 5903 } 5904}; 5905 5906} 5907 5908static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5909 CXXScopeSpec &SS, 5910 SourceLocation IdentLoc, 5911 IdentifierInfo *Ident) { 5912 NamespaceValidatorCCC Validator; 5913 R.clear(); 5914 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5915 R.getLookupKind(), Sc, &SS, 5916 &Validator)) { 5917 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5918 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5919 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5920 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5921 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5922 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5923 else 5924 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5925 << Ident << CorrectedQuotedStr 5926 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5927 5928 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5929 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5930 5931 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5932 R.addDecl(Corrected.getCorrectionDecl()); 5933 return true; 5934 } 5935 return false; 5936} 5937 5938Decl *Sema::ActOnUsingDirective(Scope *S, 5939 SourceLocation UsingLoc, 5940 SourceLocation NamespcLoc, 5941 CXXScopeSpec &SS, 5942 SourceLocation IdentLoc, 5943 IdentifierInfo *NamespcName, 5944 AttributeList *AttrList) { 5945 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5946 assert(NamespcName && "Invalid NamespcName."); 5947 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5948 5949 // This can only happen along a recovery path. 5950 while (S->getFlags() & Scope::TemplateParamScope) 5951 S = S->getParent(); 5952 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5953 5954 UsingDirectiveDecl *UDir = 0; 5955 NestedNameSpecifier *Qualifier = 0; 5956 if (SS.isSet()) 5957 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5958 5959 // Lookup namespace name. 5960 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5961 LookupParsedName(R, S, &SS); 5962 if (R.isAmbiguous()) 5963 return 0; 5964 5965 if (R.empty()) { 5966 R.clear(); 5967 // Allow "using namespace std;" or "using namespace ::std;" even if 5968 // "std" hasn't been defined yet, for GCC compatibility. 5969 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5970 NamespcName->isStr("std")) { 5971 Diag(IdentLoc, diag::ext_using_undefined_std); 5972 R.addDecl(getOrCreateStdNamespace()); 5973 R.resolveKind(); 5974 } 5975 // Otherwise, attempt typo correction. 5976 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5977 } 5978 5979 if (!R.empty()) { 5980 NamedDecl *Named = R.getFoundDecl(); 5981 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5982 && "expected namespace decl"); 5983 // C++ [namespace.udir]p1: 5984 // A using-directive specifies that the names in the nominated 5985 // namespace can be used in the scope in which the 5986 // using-directive appears after the using-directive. During 5987 // unqualified name lookup (3.4.1), the names appear as if they 5988 // were declared in the nearest enclosing namespace which 5989 // contains both the using-directive and the nominated 5990 // namespace. [Note: in this context, "contains" means "contains 5991 // directly or indirectly". ] 5992 5993 // Find enclosing context containing both using-directive and 5994 // nominated namespace. 5995 NamespaceDecl *NS = getNamespaceDecl(Named); 5996 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5997 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5998 CommonAncestor = CommonAncestor->getParent(); 5999 6000 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6001 SS.getWithLocInContext(Context), 6002 IdentLoc, Named, CommonAncestor); 6003 6004 if (IsUsingDirectiveInToplevelContext(CurContext) && 6005 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6006 Diag(IdentLoc, diag::warn_using_directive_in_header); 6007 } 6008 6009 PushUsingDirective(S, UDir); 6010 } else { 6011 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6012 } 6013 6014 // FIXME: We ignore attributes for now. 6015 return UDir; 6016} 6017 6018void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6019 // If scope has associated entity, then using directive is at namespace 6020 // or translation unit scope. We add UsingDirectiveDecls, into 6021 // it's lookup structure. 6022 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6023 Ctx->addDecl(UDir); 6024 else 6025 // Otherwise it is block-sope. using-directives will affect lookup 6026 // only to the end of scope. 6027 S->PushUsingDirective(UDir); 6028} 6029 6030 6031Decl *Sema::ActOnUsingDeclaration(Scope *S, 6032 AccessSpecifier AS, 6033 bool HasUsingKeyword, 6034 SourceLocation UsingLoc, 6035 CXXScopeSpec &SS, 6036 UnqualifiedId &Name, 6037 AttributeList *AttrList, 6038 bool IsTypeName, 6039 SourceLocation TypenameLoc) { 6040 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6041 6042 switch (Name.getKind()) { 6043 case UnqualifiedId::IK_ImplicitSelfParam: 6044 case UnqualifiedId::IK_Identifier: 6045 case UnqualifiedId::IK_OperatorFunctionId: 6046 case UnqualifiedId::IK_LiteralOperatorId: 6047 case UnqualifiedId::IK_ConversionFunctionId: 6048 break; 6049 6050 case UnqualifiedId::IK_ConstructorName: 6051 case UnqualifiedId::IK_ConstructorTemplateId: 6052 // C++0x inherited constructors. 6053 Diag(Name.getSourceRange().getBegin(), 6054 getLangOptions().CPlusPlus0x ? 6055 diag::warn_cxx98_compat_using_decl_constructor : 6056 diag::err_using_decl_constructor) 6057 << SS.getRange(); 6058 6059 if (getLangOptions().CPlusPlus0x) break; 6060 6061 return 0; 6062 6063 case UnqualifiedId::IK_DestructorName: 6064 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6065 << SS.getRange(); 6066 return 0; 6067 6068 case UnqualifiedId::IK_TemplateId: 6069 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6070 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6071 return 0; 6072 } 6073 6074 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6075 DeclarationName TargetName = TargetNameInfo.getName(); 6076 if (!TargetName) 6077 return 0; 6078 6079 // Warn about using declarations. 6080 // TODO: store that the declaration was written without 'using' and 6081 // talk about access decls instead of using decls in the 6082 // diagnostics. 6083 if (!HasUsingKeyword) { 6084 UsingLoc = Name.getSourceRange().getBegin(); 6085 6086 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6087 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6088 } 6089 6090 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6091 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6092 return 0; 6093 6094 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6095 TargetNameInfo, AttrList, 6096 /* IsInstantiation */ false, 6097 IsTypeName, TypenameLoc); 6098 if (UD) 6099 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6100 6101 return UD; 6102} 6103 6104/// \brief Determine whether a using declaration considers the given 6105/// declarations as "equivalent", e.g., if they are redeclarations of 6106/// the same entity or are both typedefs of the same type. 6107static bool 6108IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6109 bool &SuppressRedeclaration) { 6110 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6111 SuppressRedeclaration = false; 6112 return true; 6113 } 6114 6115 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6116 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6117 SuppressRedeclaration = true; 6118 return Context.hasSameType(TD1->getUnderlyingType(), 6119 TD2->getUnderlyingType()); 6120 } 6121 6122 return false; 6123} 6124 6125 6126/// Determines whether to create a using shadow decl for a particular 6127/// decl, given the set of decls existing prior to this using lookup. 6128bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6129 const LookupResult &Previous) { 6130 // Diagnose finding a decl which is not from a base class of the 6131 // current class. We do this now because there are cases where this 6132 // function will silently decide not to build a shadow decl, which 6133 // will pre-empt further diagnostics. 6134 // 6135 // We don't need to do this in C++0x because we do the check once on 6136 // the qualifier. 6137 // 6138 // FIXME: diagnose the following if we care enough: 6139 // struct A { int foo; }; 6140 // struct B : A { using A::foo; }; 6141 // template <class T> struct C : A {}; 6142 // template <class T> struct D : C<T> { using B::foo; } // <--- 6143 // This is invalid (during instantiation) in C++03 because B::foo 6144 // resolves to the using decl in B, which is not a base class of D<T>. 6145 // We can't diagnose it immediately because C<T> is an unknown 6146 // specialization. The UsingShadowDecl in D<T> then points directly 6147 // to A::foo, which will look well-formed when we instantiate. 6148 // The right solution is to not collapse the shadow-decl chain. 6149 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6150 DeclContext *OrigDC = Orig->getDeclContext(); 6151 6152 // Handle enums and anonymous structs. 6153 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6154 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6155 while (OrigRec->isAnonymousStructOrUnion()) 6156 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6157 6158 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6159 if (OrigDC == CurContext) { 6160 Diag(Using->getLocation(), 6161 diag::err_using_decl_nested_name_specifier_is_current_class) 6162 << Using->getQualifierLoc().getSourceRange(); 6163 Diag(Orig->getLocation(), diag::note_using_decl_target); 6164 return true; 6165 } 6166 6167 Diag(Using->getQualifierLoc().getBeginLoc(), 6168 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6169 << Using->getQualifier() 6170 << cast<CXXRecordDecl>(CurContext) 6171 << Using->getQualifierLoc().getSourceRange(); 6172 Diag(Orig->getLocation(), diag::note_using_decl_target); 6173 return true; 6174 } 6175 } 6176 6177 if (Previous.empty()) return false; 6178 6179 NamedDecl *Target = Orig; 6180 if (isa<UsingShadowDecl>(Target)) 6181 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6182 6183 // If the target happens to be one of the previous declarations, we 6184 // don't have a conflict. 6185 // 6186 // FIXME: but we might be increasing its access, in which case we 6187 // should redeclare it. 6188 NamedDecl *NonTag = 0, *Tag = 0; 6189 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6190 I != E; ++I) { 6191 NamedDecl *D = (*I)->getUnderlyingDecl(); 6192 bool Result; 6193 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6194 return Result; 6195 6196 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6197 } 6198 6199 if (Target->isFunctionOrFunctionTemplate()) { 6200 FunctionDecl *FD; 6201 if (isa<FunctionTemplateDecl>(Target)) 6202 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6203 else 6204 FD = cast<FunctionDecl>(Target); 6205 6206 NamedDecl *OldDecl = 0; 6207 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6208 case Ovl_Overload: 6209 return false; 6210 6211 case Ovl_NonFunction: 6212 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6213 break; 6214 6215 // We found a decl with the exact signature. 6216 case Ovl_Match: 6217 // If we're in a record, we want to hide the target, so we 6218 // return true (without a diagnostic) to tell the caller not to 6219 // build a shadow decl. 6220 if (CurContext->isRecord()) 6221 return true; 6222 6223 // If we're not in a record, this is an error. 6224 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6225 break; 6226 } 6227 6228 Diag(Target->getLocation(), diag::note_using_decl_target); 6229 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6230 return true; 6231 } 6232 6233 // Target is not a function. 6234 6235 if (isa<TagDecl>(Target)) { 6236 // No conflict between a tag and a non-tag. 6237 if (!Tag) return false; 6238 6239 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6240 Diag(Target->getLocation(), diag::note_using_decl_target); 6241 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6242 return true; 6243 } 6244 6245 // No conflict between a tag and a non-tag. 6246 if (!NonTag) return false; 6247 6248 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6249 Diag(Target->getLocation(), diag::note_using_decl_target); 6250 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6251 return true; 6252} 6253 6254/// Builds a shadow declaration corresponding to a 'using' declaration. 6255UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6256 UsingDecl *UD, 6257 NamedDecl *Orig) { 6258 6259 // If we resolved to another shadow declaration, just coalesce them. 6260 NamedDecl *Target = Orig; 6261 if (isa<UsingShadowDecl>(Target)) { 6262 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6263 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6264 } 6265 6266 UsingShadowDecl *Shadow 6267 = UsingShadowDecl::Create(Context, CurContext, 6268 UD->getLocation(), UD, Target); 6269 UD->addShadowDecl(Shadow); 6270 6271 Shadow->setAccess(UD->getAccess()); 6272 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6273 Shadow->setInvalidDecl(); 6274 6275 if (S) 6276 PushOnScopeChains(Shadow, S); 6277 else 6278 CurContext->addDecl(Shadow); 6279 6280 6281 return Shadow; 6282} 6283 6284/// Hides a using shadow declaration. This is required by the current 6285/// using-decl implementation when a resolvable using declaration in a 6286/// class is followed by a declaration which would hide or override 6287/// one or more of the using decl's targets; for example: 6288/// 6289/// struct Base { void foo(int); }; 6290/// struct Derived : Base { 6291/// using Base::foo; 6292/// void foo(int); 6293/// }; 6294/// 6295/// The governing language is C++03 [namespace.udecl]p12: 6296/// 6297/// When a using-declaration brings names from a base class into a 6298/// derived class scope, member functions in the derived class 6299/// override and/or hide member functions with the same name and 6300/// parameter types in a base class (rather than conflicting). 6301/// 6302/// There are two ways to implement this: 6303/// (1) optimistically create shadow decls when they're not hidden 6304/// by existing declarations, or 6305/// (2) don't create any shadow decls (or at least don't make them 6306/// visible) until we've fully parsed/instantiated the class. 6307/// The problem with (1) is that we might have to retroactively remove 6308/// a shadow decl, which requires several O(n) operations because the 6309/// decl structures are (very reasonably) not designed for removal. 6310/// (2) avoids this but is very fiddly and phase-dependent. 6311void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6312 if (Shadow->getDeclName().getNameKind() == 6313 DeclarationName::CXXConversionFunctionName) 6314 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6315 6316 // Remove it from the DeclContext... 6317 Shadow->getDeclContext()->removeDecl(Shadow); 6318 6319 // ...and the scope, if applicable... 6320 if (S) { 6321 S->RemoveDecl(Shadow); 6322 IdResolver.RemoveDecl(Shadow); 6323 } 6324 6325 // ...and the using decl. 6326 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6327 6328 // TODO: complain somehow if Shadow was used. It shouldn't 6329 // be possible for this to happen, because...? 6330} 6331 6332/// Builds a using declaration. 6333/// 6334/// \param IsInstantiation - Whether this call arises from an 6335/// instantiation of an unresolved using declaration. We treat 6336/// the lookup differently for these declarations. 6337NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6338 SourceLocation UsingLoc, 6339 CXXScopeSpec &SS, 6340 const DeclarationNameInfo &NameInfo, 6341 AttributeList *AttrList, 6342 bool IsInstantiation, 6343 bool IsTypeName, 6344 SourceLocation TypenameLoc) { 6345 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6346 SourceLocation IdentLoc = NameInfo.getLoc(); 6347 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6348 6349 // FIXME: We ignore attributes for now. 6350 6351 if (SS.isEmpty()) { 6352 Diag(IdentLoc, diag::err_using_requires_qualname); 6353 return 0; 6354 } 6355 6356 // Do the redeclaration lookup in the current scope. 6357 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6358 ForRedeclaration); 6359 Previous.setHideTags(false); 6360 if (S) { 6361 LookupName(Previous, S); 6362 6363 // It is really dumb that we have to do this. 6364 LookupResult::Filter F = Previous.makeFilter(); 6365 while (F.hasNext()) { 6366 NamedDecl *D = F.next(); 6367 if (!isDeclInScope(D, CurContext, S)) 6368 F.erase(); 6369 } 6370 F.done(); 6371 } else { 6372 assert(IsInstantiation && "no scope in non-instantiation"); 6373 assert(CurContext->isRecord() && "scope not record in instantiation"); 6374 LookupQualifiedName(Previous, CurContext); 6375 } 6376 6377 // Check for invalid redeclarations. 6378 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6379 return 0; 6380 6381 // Check for bad qualifiers. 6382 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6383 return 0; 6384 6385 DeclContext *LookupContext = computeDeclContext(SS); 6386 NamedDecl *D; 6387 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6388 if (!LookupContext) { 6389 if (IsTypeName) { 6390 // FIXME: not all declaration name kinds are legal here 6391 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6392 UsingLoc, TypenameLoc, 6393 QualifierLoc, 6394 IdentLoc, NameInfo.getName()); 6395 } else { 6396 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6397 QualifierLoc, NameInfo); 6398 } 6399 } else { 6400 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6401 NameInfo, IsTypeName); 6402 } 6403 D->setAccess(AS); 6404 CurContext->addDecl(D); 6405 6406 if (!LookupContext) return D; 6407 UsingDecl *UD = cast<UsingDecl>(D); 6408 6409 if (RequireCompleteDeclContext(SS, LookupContext)) { 6410 UD->setInvalidDecl(); 6411 return UD; 6412 } 6413 6414 // Constructor inheriting using decls get special treatment. 6415 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6416 if (CheckInheritedConstructorUsingDecl(UD)) 6417 UD->setInvalidDecl(); 6418 return UD; 6419 } 6420 6421 // Otherwise, look up the target name. 6422 6423 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6424 6425 // Unlike most lookups, we don't always want to hide tag 6426 // declarations: tag names are visible through the using declaration 6427 // even if hidden by ordinary names, *except* in a dependent context 6428 // where it's important for the sanity of two-phase lookup. 6429 if (!IsInstantiation) 6430 R.setHideTags(false); 6431 6432 LookupQualifiedName(R, LookupContext); 6433 6434 if (R.empty()) { 6435 Diag(IdentLoc, diag::err_no_member) 6436 << NameInfo.getName() << LookupContext << SS.getRange(); 6437 UD->setInvalidDecl(); 6438 return UD; 6439 } 6440 6441 if (R.isAmbiguous()) { 6442 UD->setInvalidDecl(); 6443 return UD; 6444 } 6445 6446 if (IsTypeName) { 6447 // If we asked for a typename and got a non-type decl, error out. 6448 if (!R.getAsSingle<TypeDecl>()) { 6449 Diag(IdentLoc, diag::err_using_typename_non_type); 6450 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6451 Diag((*I)->getUnderlyingDecl()->getLocation(), 6452 diag::note_using_decl_target); 6453 UD->setInvalidDecl(); 6454 return UD; 6455 } 6456 } else { 6457 // If we asked for a non-typename and we got a type, error out, 6458 // but only if this is an instantiation of an unresolved using 6459 // decl. Otherwise just silently find the type name. 6460 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6461 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6462 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6463 UD->setInvalidDecl(); 6464 return UD; 6465 } 6466 } 6467 6468 // C++0x N2914 [namespace.udecl]p6: 6469 // A using-declaration shall not name a namespace. 6470 if (R.getAsSingle<NamespaceDecl>()) { 6471 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6472 << SS.getRange(); 6473 UD->setInvalidDecl(); 6474 return UD; 6475 } 6476 6477 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6478 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6479 BuildUsingShadowDecl(S, UD, *I); 6480 } 6481 6482 return UD; 6483} 6484 6485/// Additional checks for a using declaration referring to a constructor name. 6486bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6487 if (UD->isTypeName()) { 6488 // FIXME: Cannot specify typename when specifying constructor 6489 return true; 6490 } 6491 6492 const Type *SourceType = UD->getQualifier()->getAsType(); 6493 assert(SourceType && 6494 "Using decl naming constructor doesn't have type in scope spec."); 6495 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6496 6497 // Check whether the named type is a direct base class. 6498 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6499 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6500 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6501 BaseIt != BaseE; ++BaseIt) { 6502 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6503 if (CanonicalSourceType == BaseType) 6504 break; 6505 } 6506 6507 if (BaseIt == BaseE) { 6508 // Did not find SourceType in the bases. 6509 Diag(UD->getUsingLocation(), 6510 diag::err_using_decl_constructor_not_in_direct_base) 6511 << UD->getNameInfo().getSourceRange() 6512 << QualType(SourceType, 0) << TargetClass; 6513 return true; 6514 } 6515 6516 BaseIt->setInheritConstructors(); 6517 6518 return false; 6519} 6520 6521/// Checks that the given using declaration is not an invalid 6522/// redeclaration. Note that this is checking only for the using decl 6523/// itself, not for any ill-formedness among the UsingShadowDecls. 6524bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6525 bool isTypeName, 6526 const CXXScopeSpec &SS, 6527 SourceLocation NameLoc, 6528 const LookupResult &Prev) { 6529 // C++03 [namespace.udecl]p8: 6530 // C++0x [namespace.udecl]p10: 6531 // A using-declaration is a declaration and can therefore be used 6532 // repeatedly where (and only where) multiple declarations are 6533 // allowed. 6534 // 6535 // That's in non-member contexts. 6536 if (!CurContext->getRedeclContext()->isRecord()) 6537 return false; 6538 6539 NestedNameSpecifier *Qual 6540 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6541 6542 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6543 NamedDecl *D = *I; 6544 6545 bool DTypename; 6546 NestedNameSpecifier *DQual; 6547 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6548 DTypename = UD->isTypeName(); 6549 DQual = UD->getQualifier(); 6550 } else if (UnresolvedUsingValueDecl *UD 6551 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6552 DTypename = false; 6553 DQual = UD->getQualifier(); 6554 } else if (UnresolvedUsingTypenameDecl *UD 6555 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6556 DTypename = true; 6557 DQual = UD->getQualifier(); 6558 } else continue; 6559 6560 // using decls differ if one says 'typename' and the other doesn't. 6561 // FIXME: non-dependent using decls? 6562 if (isTypeName != DTypename) continue; 6563 6564 // using decls differ if they name different scopes (but note that 6565 // template instantiation can cause this check to trigger when it 6566 // didn't before instantiation). 6567 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6568 Context.getCanonicalNestedNameSpecifier(DQual)) 6569 continue; 6570 6571 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6572 Diag(D->getLocation(), diag::note_using_decl) << 1; 6573 return true; 6574 } 6575 6576 return false; 6577} 6578 6579 6580/// Checks that the given nested-name qualifier used in a using decl 6581/// in the current context is appropriately related to the current 6582/// scope. If an error is found, diagnoses it and returns true. 6583bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6584 const CXXScopeSpec &SS, 6585 SourceLocation NameLoc) { 6586 DeclContext *NamedContext = computeDeclContext(SS); 6587 6588 if (!CurContext->isRecord()) { 6589 // C++03 [namespace.udecl]p3: 6590 // C++0x [namespace.udecl]p8: 6591 // A using-declaration for a class member shall be a member-declaration. 6592 6593 // If we weren't able to compute a valid scope, it must be a 6594 // dependent class scope. 6595 if (!NamedContext || NamedContext->isRecord()) { 6596 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6597 << SS.getRange(); 6598 return true; 6599 } 6600 6601 // Otherwise, everything is known to be fine. 6602 return false; 6603 } 6604 6605 // The current scope is a record. 6606 6607 // If the named context is dependent, we can't decide much. 6608 if (!NamedContext) { 6609 // FIXME: in C++0x, we can diagnose if we can prove that the 6610 // nested-name-specifier does not refer to a base class, which is 6611 // still possible in some cases. 6612 6613 // Otherwise we have to conservatively report that things might be 6614 // okay. 6615 return false; 6616 } 6617 6618 if (!NamedContext->isRecord()) { 6619 // Ideally this would point at the last name in the specifier, 6620 // but we don't have that level of source info. 6621 Diag(SS.getRange().getBegin(), 6622 diag::err_using_decl_nested_name_specifier_is_not_class) 6623 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6624 return true; 6625 } 6626 6627 if (!NamedContext->isDependentContext() && 6628 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6629 return true; 6630 6631 if (getLangOptions().CPlusPlus0x) { 6632 // C++0x [namespace.udecl]p3: 6633 // In a using-declaration used as a member-declaration, the 6634 // nested-name-specifier shall name a base class of the class 6635 // being defined. 6636 6637 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6638 cast<CXXRecordDecl>(NamedContext))) { 6639 if (CurContext == NamedContext) { 6640 Diag(NameLoc, 6641 diag::err_using_decl_nested_name_specifier_is_current_class) 6642 << SS.getRange(); 6643 return true; 6644 } 6645 6646 Diag(SS.getRange().getBegin(), 6647 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6648 << (NestedNameSpecifier*) SS.getScopeRep() 6649 << cast<CXXRecordDecl>(CurContext) 6650 << SS.getRange(); 6651 return true; 6652 } 6653 6654 return false; 6655 } 6656 6657 // C++03 [namespace.udecl]p4: 6658 // A using-declaration used as a member-declaration shall refer 6659 // to a member of a base class of the class being defined [etc.]. 6660 6661 // Salient point: SS doesn't have to name a base class as long as 6662 // lookup only finds members from base classes. Therefore we can 6663 // diagnose here only if we can prove that that can't happen, 6664 // i.e. if the class hierarchies provably don't intersect. 6665 6666 // TODO: it would be nice if "definitely valid" results were cached 6667 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6668 // need to be repeated. 6669 6670 struct UserData { 6671 llvm::DenseSet<const CXXRecordDecl*> Bases; 6672 6673 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6674 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6675 Data->Bases.insert(Base); 6676 return true; 6677 } 6678 6679 bool hasDependentBases(const CXXRecordDecl *Class) { 6680 return !Class->forallBases(collect, this); 6681 } 6682 6683 /// Returns true if the base is dependent or is one of the 6684 /// accumulated base classes. 6685 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6686 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6687 return !Data->Bases.count(Base); 6688 } 6689 6690 bool mightShareBases(const CXXRecordDecl *Class) { 6691 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6692 } 6693 }; 6694 6695 UserData Data; 6696 6697 // Returns false if we find a dependent base. 6698 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6699 return false; 6700 6701 // Returns false if the class has a dependent base or if it or one 6702 // of its bases is present in the base set of the current context. 6703 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6704 return false; 6705 6706 Diag(SS.getRange().getBegin(), 6707 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6708 << (NestedNameSpecifier*) SS.getScopeRep() 6709 << cast<CXXRecordDecl>(CurContext) 6710 << SS.getRange(); 6711 6712 return true; 6713} 6714 6715Decl *Sema::ActOnAliasDeclaration(Scope *S, 6716 AccessSpecifier AS, 6717 MultiTemplateParamsArg TemplateParamLists, 6718 SourceLocation UsingLoc, 6719 UnqualifiedId &Name, 6720 TypeResult Type) { 6721 // Skip up to the relevant declaration scope. 6722 while (S->getFlags() & Scope::TemplateParamScope) 6723 S = S->getParent(); 6724 assert((S->getFlags() & Scope::DeclScope) && 6725 "got alias-declaration outside of declaration scope"); 6726 6727 if (Type.isInvalid()) 6728 return 0; 6729 6730 bool Invalid = false; 6731 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6732 TypeSourceInfo *TInfo = 0; 6733 GetTypeFromParser(Type.get(), &TInfo); 6734 6735 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6736 return 0; 6737 6738 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6739 UPPC_DeclarationType)) { 6740 Invalid = true; 6741 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6742 TInfo->getTypeLoc().getBeginLoc()); 6743 } 6744 6745 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6746 LookupName(Previous, S); 6747 6748 // Warn about shadowing the name of a template parameter. 6749 if (Previous.isSingleResult() && 6750 Previous.getFoundDecl()->isTemplateParameter()) { 6751 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6752 Previous.clear(); 6753 } 6754 6755 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6756 "name in alias declaration must be an identifier"); 6757 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6758 Name.StartLocation, 6759 Name.Identifier, TInfo); 6760 6761 NewTD->setAccess(AS); 6762 6763 if (Invalid) 6764 NewTD->setInvalidDecl(); 6765 6766 CheckTypedefForVariablyModifiedType(S, NewTD); 6767 Invalid |= NewTD->isInvalidDecl(); 6768 6769 bool Redeclaration = false; 6770 6771 NamedDecl *NewND; 6772 if (TemplateParamLists.size()) { 6773 TypeAliasTemplateDecl *OldDecl = 0; 6774 TemplateParameterList *OldTemplateParams = 0; 6775 6776 if (TemplateParamLists.size() != 1) { 6777 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6778 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6779 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6780 } 6781 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6782 6783 // Only consider previous declarations in the same scope. 6784 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6785 /*ExplicitInstantiationOrSpecialization*/false); 6786 if (!Previous.empty()) { 6787 Redeclaration = true; 6788 6789 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6790 if (!OldDecl && !Invalid) { 6791 Diag(UsingLoc, diag::err_redefinition_different_kind) 6792 << Name.Identifier; 6793 6794 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6795 if (OldD->getLocation().isValid()) 6796 Diag(OldD->getLocation(), diag::note_previous_definition); 6797 6798 Invalid = true; 6799 } 6800 6801 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6802 if (TemplateParameterListsAreEqual(TemplateParams, 6803 OldDecl->getTemplateParameters(), 6804 /*Complain=*/true, 6805 TPL_TemplateMatch)) 6806 OldTemplateParams = OldDecl->getTemplateParameters(); 6807 else 6808 Invalid = true; 6809 6810 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6811 if (!Invalid && 6812 !Context.hasSameType(OldTD->getUnderlyingType(), 6813 NewTD->getUnderlyingType())) { 6814 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6815 // but we can't reasonably accept it. 6816 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6817 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6818 if (OldTD->getLocation().isValid()) 6819 Diag(OldTD->getLocation(), diag::note_previous_definition); 6820 Invalid = true; 6821 } 6822 } 6823 } 6824 6825 // Merge any previous default template arguments into our parameters, 6826 // and check the parameter list. 6827 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6828 TPC_TypeAliasTemplate)) 6829 return 0; 6830 6831 TypeAliasTemplateDecl *NewDecl = 6832 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6833 Name.Identifier, TemplateParams, 6834 NewTD); 6835 6836 NewDecl->setAccess(AS); 6837 6838 if (Invalid) 6839 NewDecl->setInvalidDecl(); 6840 else if (OldDecl) 6841 NewDecl->setPreviousDeclaration(OldDecl); 6842 6843 NewND = NewDecl; 6844 } else { 6845 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6846 NewND = NewTD; 6847 } 6848 6849 if (!Redeclaration) 6850 PushOnScopeChains(NewND, S); 6851 6852 return NewND; 6853} 6854 6855Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6856 SourceLocation NamespaceLoc, 6857 SourceLocation AliasLoc, 6858 IdentifierInfo *Alias, 6859 CXXScopeSpec &SS, 6860 SourceLocation IdentLoc, 6861 IdentifierInfo *Ident) { 6862 6863 // Lookup the namespace name. 6864 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6865 LookupParsedName(R, S, &SS); 6866 6867 // Check if we have a previous declaration with the same name. 6868 NamedDecl *PrevDecl 6869 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6870 ForRedeclaration); 6871 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6872 PrevDecl = 0; 6873 6874 if (PrevDecl) { 6875 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6876 // We already have an alias with the same name that points to the same 6877 // namespace, so don't create a new one. 6878 // FIXME: At some point, we'll want to create the (redundant) 6879 // declaration to maintain better source information. 6880 if (!R.isAmbiguous() && !R.empty() && 6881 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6882 return 0; 6883 } 6884 6885 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6886 diag::err_redefinition_different_kind; 6887 Diag(AliasLoc, DiagID) << Alias; 6888 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6889 return 0; 6890 } 6891 6892 if (R.isAmbiguous()) 6893 return 0; 6894 6895 if (R.empty()) { 6896 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6897 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6898 return 0; 6899 } 6900 } 6901 6902 NamespaceAliasDecl *AliasDecl = 6903 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6904 Alias, SS.getWithLocInContext(Context), 6905 IdentLoc, R.getFoundDecl()); 6906 6907 PushOnScopeChains(AliasDecl, S); 6908 return AliasDecl; 6909} 6910 6911namespace { 6912 /// \brief Scoped object used to handle the state changes required in Sema 6913 /// to implicitly define the body of a C++ member function; 6914 class ImplicitlyDefinedFunctionScope { 6915 Sema &S; 6916 Sema::ContextRAII SavedContext; 6917 6918 public: 6919 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6920 : S(S), SavedContext(S, Method) 6921 { 6922 S.PushFunctionScope(); 6923 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6924 } 6925 6926 ~ImplicitlyDefinedFunctionScope() { 6927 S.PopExpressionEvaluationContext(); 6928 S.PopFunctionScopeInfo(); 6929 } 6930 }; 6931} 6932 6933Sema::ImplicitExceptionSpecification 6934Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6935 // C++ [except.spec]p14: 6936 // An implicitly declared special member function (Clause 12) shall have an 6937 // exception-specification. [...] 6938 ImplicitExceptionSpecification ExceptSpec(Context); 6939 if (ClassDecl->isInvalidDecl()) 6940 return ExceptSpec; 6941 6942 // Direct base-class constructors. 6943 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6944 BEnd = ClassDecl->bases_end(); 6945 B != BEnd; ++B) { 6946 if (B->isVirtual()) // Handled below. 6947 continue; 6948 6949 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6950 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6951 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6952 // If this is a deleted function, add it anyway. This might be conformant 6953 // with the standard. This might not. I'm not sure. It might not matter. 6954 if (Constructor) 6955 ExceptSpec.CalledDecl(Constructor); 6956 } 6957 } 6958 6959 // Virtual base-class constructors. 6960 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6961 BEnd = ClassDecl->vbases_end(); 6962 B != BEnd; ++B) { 6963 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6964 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6965 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6966 // If this is a deleted function, add it anyway. This might be conformant 6967 // with the standard. This might not. I'm not sure. It might not matter. 6968 if (Constructor) 6969 ExceptSpec.CalledDecl(Constructor); 6970 } 6971 } 6972 6973 // Field constructors. 6974 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6975 FEnd = ClassDecl->field_end(); 6976 F != FEnd; ++F) { 6977 if (F->hasInClassInitializer()) { 6978 if (Expr *E = F->getInClassInitializer()) 6979 ExceptSpec.CalledExpr(E); 6980 else if (!F->isInvalidDecl()) 6981 ExceptSpec.SetDelayed(); 6982 } else if (const RecordType *RecordTy 6983 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6984 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6985 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6986 // If this is a deleted function, add it anyway. This might be conformant 6987 // with the standard. This might not. I'm not sure. It might not matter. 6988 // In particular, the problem is that this function never gets called. It 6989 // might just be ill-formed because this function attempts to refer to 6990 // a deleted function here. 6991 if (Constructor) 6992 ExceptSpec.CalledDecl(Constructor); 6993 } 6994 } 6995 6996 return ExceptSpec; 6997} 6998 6999CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7000 CXXRecordDecl *ClassDecl) { 7001 // C++ [class.ctor]p5: 7002 // A default constructor for a class X is a constructor of class X 7003 // that can be called without an argument. If there is no 7004 // user-declared constructor for class X, a default constructor is 7005 // implicitly declared. An implicitly-declared default constructor 7006 // is an inline public member of its class. 7007 assert(!ClassDecl->hasUserDeclaredConstructor() && 7008 "Should not build implicit default constructor!"); 7009 7010 ImplicitExceptionSpecification Spec = 7011 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7012 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7013 7014 // Create the actual constructor declaration. 7015 CanQualType ClassType 7016 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7017 SourceLocation ClassLoc = ClassDecl->getLocation(); 7018 DeclarationName Name 7019 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7020 DeclarationNameInfo NameInfo(Name, ClassLoc); 7021 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7022 Context, ClassDecl, ClassLoc, NameInfo, 7023 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 7024 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7025 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 7026 getLangOptions().CPlusPlus0x); 7027 DefaultCon->setAccess(AS_public); 7028 DefaultCon->setDefaulted(); 7029 DefaultCon->setImplicit(); 7030 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7031 7032 // Note that we have declared this constructor. 7033 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7034 7035 if (Scope *S = getScopeForContext(ClassDecl)) 7036 PushOnScopeChains(DefaultCon, S, false); 7037 ClassDecl->addDecl(DefaultCon); 7038 7039 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7040 DefaultCon->setDeletedAsWritten(); 7041 7042 return DefaultCon; 7043} 7044 7045void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7046 CXXConstructorDecl *Constructor) { 7047 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7048 !Constructor->doesThisDeclarationHaveABody() && 7049 !Constructor->isDeleted()) && 7050 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7051 7052 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7053 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7054 7055 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7056 DiagnosticErrorTrap Trap(Diags); 7057 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7058 Trap.hasErrorOccurred()) { 7059 Diag(CurrentLocation, diag::note_member_synthesized_at) 7060 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7061 Constructor->setInvalidDecl(); 7062 return; 7063 } 7064 7065 SourceLocation Loc = Constructor->getLocation(); 7066 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7067 7068 Constructor->setUsed(); 7069 MarkVTableUsed(CurrentLocation, ClassDecl); 7070 7071 if (ASTMutationListener *L = getASTMutationListener()) { 7072 L->CompletedImplicitDefinition(Constructor); 7073 } 7074} 7075 7076/// Get any existing defaulted default constructor for the given class. Do not 7077/// implicitly define one if it does not exist. 7078static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7079 CXXRecordDecl *D) { 7080 ASTContext &Context = Self.Context; 7081 QualType ClassType = Context.getTypeDeclType(D); 7082 DeclarationName ConstructorName 7083 = Context.DeclarationNames.getCXXConstructorName( 7084 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7085 7086 DeclContext::lookup_const_iterator Con, ConEnd; 7087 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7088 Con != ConEnd; ++Con) { 7089 // A function template cannot be defaulted. 7090 if (isa<FunctionTemplateDecl>(*Con)) 7091 continue; 7092 7093 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7094 if (Constructor->isDefaultConstructor()) 7095 return Constructor->isDefaulted() ? Constructor : 0; 7096 } 7097 return 0; 7098} 7099 7100void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7101 if (!D) return; 7102 AdjustDeclIfTemplate(D); 7103 7104 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7105 CXXConstructorDecl *CtorDecl 7106 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7107 7108 if (!CtorDecl) return; 7109 7110 // Compute the exception specification for the default constructor. 7111 const FunctionProtoType *CtorTy = 7112 CtorDecl->getType()->castAs<FunctionProtoType>(); 7113 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7114 ImplicitExceptionSpecification Spec = 7115 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7116 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7117 assert(EPI.ExceptionSpecType != EST_Delayed); 7118 7119 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7120 } 7121 7122 // If the default constructor is explicitly defaulted, checking the exception 7123 // specification is deferred until now. 7124 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7125 !ClassDecl->isDependentType()) 7126 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7127} 7128 7129void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7130 // We start with an initial pass over the base classes to collect those that 7131 // inherit constructors from. If there are none, we can forgo all further 7132 // processing. 7133 typedef SmallVector<const RecordType *, 4> BasesVector; 7134 BasesVector BasesToInheritFrom; 7135 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7136 BaseE = ClassDecl->bases_end(); 7137 BaseIt != BaseE; ++BaseIt) { 7138 if (BaseIt->getInheritConstructors()) { 7139 QualType Base = BaseIt->getType(); 7140 if (Base->isDependentType()) { 7141 // If we inherit constructors from anything that is dependent, just 7142 // abort processing altogether. We'll get another chance for the 7143 // instantiations. 7144 return; 7145 } 7146 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7147 } 7148 } 7149 if (BasesToInheritFrom.empty()) 7150 return; 7151 7152 // Now collect the constructors that we already have in the current class. 7153 // Those take precedence over inherited constructors. 7154 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7155 // unless there is a user-declared constructor with the same signature in 7156 // the class where the using-declaration appears. 7157 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7158 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7159 CtorE = ClassDecl->ctor_end(); 7160 CtorIt != CtorE; ++CtorIt) { 7161 ExistingConstructors.insert( 7162 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7163 } 7164 7165 Scope *S = getScopeForContext(ClassDecl); 7166 DeclarationName CreatedCtorName = 7167 Context.DeclarationNames.getCXXConstructorName( 7168 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7169 7170 // Now comes the true work. 7171 // First, we keep a map from constructor types to the base that introduced 7172 // them. Needed for finding conflicting constructors. We also keep the 7173 // actually inserted declarations in there, for pretty diagnostics. 7174 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7175 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7176 ConstructorToSourceMap InheritedConstructors; 7177 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7178 BaseE = BasesToInheritFrom.end(); 7179 BaseIt != BaseE; ++BaseIt) { 7180 const RecordType *Base = *BaseIt; 7181 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7182 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7183 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7184 CtorE = BaseDecl->ctor_end(); 7185 CtorIt != CtorE; ++CtorIt) { 7186 // Find the using declaration for inheriting this base's constructors. 7187 DeclarationName Name = 7188 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7189 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7190 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7191 SourceLocation UsingLoc = UD ? UD->getLocation() : 7192 ClassDecl->getLocation(); 7193 7194 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7195 // from the class X named in the using-declaration consists of actual 7196 // constructors and notional constructors that result from the 7197 // transformation of defaulted parameters as follows: 7198 // - all non-template default constructors of X, and 7199 // - for each non-template constructor of X that has at least one 7200 // parameter with a default argument, the set of constructors that 7201 // results from omitting any ellipsis parameter specification and 7202 // successively omitting parameters with a default argument from the 7203 // end of the parameter-type-list. 7204 CXXConstructorDecl *BaseCtor = *CtorIt; 7205 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7206 const FunctionProtoType *BaseCtorType = 7207 BaseCtor->getType()->getAs<FunctionProtoType>(); 7208 7209 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7210 maxParams = BaseCtor->getNumParams(); 7211 params <= maxParams; ++params) { 7212 // Skip default constructors. They're never inherited. 7213 if (params == 0) 7214 continue; 7215 // Skip copy and move constructors for the same reason. 7216 if (CanBeCopyOrMove && params == 1) 7217 continue; 7218 7219 // Build up a function type for this particular constructor. 7220 // FIXME: The working paper does not consider that the exception spec 7221 // for the inheriting constructor might be larger than that of the 7222 // source. This code doesn't yet, either. When it does, this code will 7223 // need to be delayed until after exception specifications and in-class 7224 // member initializers are attached. 7225 const Type *NewCtorType; 7226 if (params == maxParams) 7227 NewCtorType = BaseCtorType; 7228 else { 7229 SmallVector<QualType, 16> Args; 7230 for (unsigned i = 0; i < params; ++i) { 7231 Args.push_back(BaseCtorType->getArgType(i)); 7232 } 7233 FunctionProtoType::ExtProtoInfo ExtInfo = 7234 BaseCtorType->getExtProtoInfo(); 7235 ExtInfo.Variadic = false; 7236 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7237 Args.data(), params, ExtInfo) 7238 .getTypePtr(); 7239 } 7240 const Type *CanonicalNewCtorType = 7241 Context.getCanonicalType(NewCtorType); 7242 7243 // Now that we have the type, first check if the class already has a 7244 // constructor with this signature. 7245 if (ExistingConstructors.count(CanonicalNewCtorType)) 7246 continue; 7247 7248 // Then we check if we have already declared an inherited constructor 7249 // with this signature. 7250 std::pair<ConstructorToSourceMap::iterator, bool> result = 7251 InheritedConstructors.insert(std::make_pair( 7252 CanonicalNewCtorType, 7253 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7254 if (!result.second) { 7255 // Already in the map. If it came from a different class, that's an 7256 // error. Not if it's from the same. 7257 CanQualType PreviousBase = result.first->second.first; 7258 if (CanonicalBase != PreviousBase) { 7259 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7260 const CXXConstructorDecl *PrevBaseCtor = 7261 PrevCtor->getInheritedConstructor(); 7262 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7263 7264 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7265 Diag(BaseCtor->getLocation(), 7266 diag::note_using_decl_constructor_conflict_current_ctor); 7267 Diag(PrevBaseCtor->getLocation(), 7268 diag::note_using_decl_constructor_conflict_previous_ctor); 7269 Diag(PrevCtor->getLocation(), 7270 diag::note_using_decl_constructor_conflict_previous_using); 7271 } 7272 continue; 7273 } 7274 7275 // OK, we're there, now add the constructor. 7276 // C++0x [class.inhctor]p8: [...] that would be performed by a 7277 // user-written inline constructor [...] 7278 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7279 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7280 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7281 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7282 /*ImplicitlyDeclared=*/true, 7283 // FIXME: Due to a defect in the standard, we treat inherited 7284 // constructors as constexpr even if that makes them ill-formed. 7285 /*Constexpr=*/BaseCtor->isConstexpr()); 7286 NewCtor->setAccess(BaseCtor->getAccess()); 7287 7288 // Build up the parameter decls and add them. 7289 SmallVector<ParmVarDecl *, 16> ParamDecls; 7290 for (unsigned i = 0; i < params; ++i) { 7291 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7292 UsingLoc, UsingLoc, 7293 /*IdentifierInfo=*/0, 7294 BaseCtorType->getArgType(i), 7295 /*TInfo=*/0, SC_None, 7296 SC_None, /*DefaultArg=*/0)); 7297 } 7298 NewCtor->setParams(ParamDecls); 7299 NewCtor->setInheritedConstructor(BaseCtor); 7300 7301 PushOnScopeChains(NewCtor, S, false); 7302 ClassDecl->addDecl(NewCtor); 7303 result.first->second.second = NewCtor; 7304 } 7305 } 7306 } 7307} 7308 7309Sema::ImplicitExceptionSpecification 7310Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7311 // C++ [except.spec]p14: 7312 // An implicitly declared special member function (Clause 12) shall have 7313 // an exception-specification. 7314 ImplicitExceptionSpecification ExceptSpec(Context); 7315 if (ClassDecl->isInvalidDecl()) 7316 return ExceptSpec; 7317 7318 // Direct base-class destructors. 7319 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7320 BEnd = ClassDecl->bases_end(); 7321 B != BEnd; ++B) { 7322 if (B->isVirtual()) // Handled below. 7323 continue; 7324 7325 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7326 ExceptSpec.CalledDecl( 7327 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7328 } 7329 7330 // Virtual base-class destructors. 7331 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7332 BEnd = ClassDecl->vbases_end(); 7333 B != BEnd; ++B) { 7334 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7335 ExceptSpec.CalledDecl( 7336 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7337 } 7338 7339 // Field destructors. 7340 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7341 FEnd = ClassDecl->field_end(); 7342 F != FEnd; ++F) { 7343 if (const RecordType *RecordTy 7344 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7345 ExceptSpec.CalledDecl( 7346 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7347 } 7348 7349 return ExceptSpec; 7350} 7351 7352CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7353 // C++ [class.dtor]p2: 7354 // If a class has no user-declared destructor, a destructor is 7355 // declared implicitly. An implicitly-declared destructor is an 7356 // inline public member of its class. 7357 7358 ImplicitExceptionSpecification Spec = 7359 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7360 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7361 7362 // Create the actual destructor declaration. 7363 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7364 7365 CanQualType ClassType 7366 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7367 SourceLocation ClassLoc = ClassDecl->getLocation(); 7368 DeclarationName Name 7369 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7370 DeclarationNameInfo NameInfo(Name, ClassLoc); 7371 CXXDestructorDecl *Destructor 7372 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7373 /*isInline=*/true, 7374 /*isImplicitlyDeclared=*/true); 7375 Destructor->setAccess(AS_public); 7376 Destructor->setDefaulted(); 7377 Destructor->setImplicit(); 7378 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7379 7380 // Note that we have declared this destructor. 7381 ++ASTContext::NumImplicitDestructorsDeclared; 7382 7383 // Introduce this destructor into its scope. 7384 if (Scope *S = getScopeForContext(ClassDecl)) 7385 PushOnScopeChains(Destructor, S, false); 7386 ClassDecl->addDecl(Destructor); 7387 7388 // This could be uniqued if it ever proves significant. 7389 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7390 7391 if (ShouldDeleteDestructor(Destructor)) 7392 Destructor->setDeletedAsWritten(); 7393 7394 AddOverriddenMethods(ClassDecl, Destructor); 7395 7396 return Destructor; 7397} 7398 7399void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7400 CXXDestructorDecl *Destructor) { 7401 assert((Destructor->isDefaulted() && 7402 !Destructor->doesThisDeclarationHaveABody()) && 7403 "DefineImplicitDestructor - call it for implicit default dtor"); 7404 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7405 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7406 7407 if (Destructor->isInvalidDecl()) 7408 return; 7409 7410 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7411 7412 DiagnosticErrorTrap Trap(Diags); 7413 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7414 Destructor->getParent()); 7415 7416 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7417 Diag(CurrentLocation, diag::note_member_synthesized_at) 7418 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7419 7420 Destructor->setInvalidDecl(); 7421 return; 7422 } 7423 7424 SourceLocation Loc = Destructor->getLocation(); 7425 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7426 Destructor->setImplicitlyDefined(true); 7427 Destructor->setUsed(); 7428 MarkVTableUsed(CurrentLocation, ClassDecl); 7429 7430 if (ASTMutationListener *L = getASTMutationListener()) { 7431 L->CompletedImplicitDefinition(Destructor); 7432 } 7433} 7434 7435void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7436 CXXDestructorDecl *destructor) { 7437 // C++11 [class.dtor]p3: 7438 // A declaration of a destructor that does not have an exception- 7439 // specification is implicitly considered to have the same exception- 7440 // specification as an implicit declaration. 7441 const FunctionProtoType *dtorType = destructor->getType()-> 7442 getAs<FunctionProtoType>(); 7443 if (dtorType->hasExceptionSpec()) 7444 return; 7445 7446 ImplicitExceptionSpecification exceptSpec = 7447 ComputeDefaultedDtorExceptionSpec(classDecl); 7448 7449 // Replace the destructor's type, building off the existing one. Fortunately, 7450 // the only thing of interest in the destructor type is its extended info. 7451 // The return and arguments are fixed. 7452 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7453 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7454 epi.NumExceptions = exceptSpec.size(); 7455 epi.Exceptions = exceptSpec.data(); 7456 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7457 7458 destructor->setType(ty); 7459 7460 // FIXME: If the destructor has a body that could throw, and the newly created 7461 // spec doesn't allow exceptions, we should emit a warning, because this 7462 // change in behavior can break conforming C++03 programs at runtime. 7463 // However, we don't have a body yet, so it needs to be done somewhere else. 7464} 7465 7466/// \brief Builds a statement that copies/moves the given entity from \p From to 7467/// \c To. 7468/// 7469/// This routine is used to copy/move the members of a class with an 7470/// implicitly-declared copy/move assignment operator. When the entities being 7471/// copied are arrays, this routine builds for loops to copy them. 7472/// 7473/// \param S The Sema object used for type-checking. 7474/// 7475/// \param Loc The location where the implicit copy/move is being generated. 7476/// 7477/// \param T The type of the expressions being copied/moved. Both expressions 7478/// must have this type. 7479/// 7480/// \param To The expression we are copying/moving to. 7481/// 7482/// \param From The expression we are copying/moving from. 7483/// 7484/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7485/// Otherwise, it's a non-static member subobject. 7486/// 7487/// \param Copying Whether we're copying or moving. 7488/// 7489/// \param Depth Internal parameter recording the depth of the recursion. 7490/// 7491/// \returns A statement or a loop that copies the expressions. 7492static StmtResult 7493BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7494 Expr *To, Expr *From, 7495 bool CopyingBaseSubobject, bool Copying, 7496 unsigned Depth = 0) { 7497 // C++0x [class.copy]p28: 7498 // Each subobject is assigned in the manner appropriate to its type: 7499 // 7500 // - if the subobject is of class type, as if by a call to operator= with 7501 // the subobject as the object expression and the corresponding 7502 // subobject of x as a single function argument (as if by explicit 7503 // qualification; that is, ignoring any possible virtual overriding 7504 // functions in more derived classes); 7505 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7506 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7507 7508 // Look for operator=. 7509 DeclarationName Name 7510 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7511 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7512 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7513 7514 // Filter out any result that isn't a copy/move-assignment operator. 7515 LookupResult::Filter F = OpLookup.makeFilter(); 7516 while (F.hasNext()) { 7517 NamedDecl *D = F.next(); 7518 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7519 if (Copying ? Method->isCopyAssignmentOperator() : 7520 Method->isMoveAssignmentOperator()) 7521 continue; 7522 7523 F.erase(); 7524 } 7525 F.done(); 7526 7527 // Suppress the protected check (C++ [class.protected]) for each of the 7528 // assignment operators we found. This strange dance is required when 7529 // we're assigning via a base classes's copy-assignment operator. To 7530 // ensure that we're getting the right base class subobject (without 7531 // ambiguities), we need to cast "this" to that subobject type; to 7532 // ensure that we don't go through the virtual call mechanism, we need 7533 // to qualify the operator= name with the base class (see below). However, 7534 // this means that if the base class has a protected copy assignment 7535 // operator, the protected member access check will fail. So, we 7536 // rewrite "protected" access to "public" access in this case, since we 7537 // know by construction that we're calling from a derived class. 7538 if (CopyingBaseSubobject) { 7539 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7540 L != LEnd; ++L) { 7541 if (L.getAccess() == AS_protected) 7542 L.setAccess(AS_public); 7543 } 7544 } 7545 7546 // Create the nested-name-specifier that will be used to qualify the 7547 // reference to operator=; this is required to suppress the virtual 7548 // call mechanism. 7549 CXXScopeSpec SS; 7550 SS.MakeTrivial(S.Context, 7551 NestedNameSpecifier::Create(S.Context, 0, false, 7552 T.getTypePtr()), 7553 Loc); 7554 7555 // Create the reference to operator=. 7556 ExprResult OpEqualRef 7557 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7558 /*FirstQualifierInScope=*/0, OpLookup, 7559 /*TemplateArgs=*/0, 7560 /*SuppressQualifierCheck=*/true); 7561 if (OpEqualRef.isInvalid()) 7562 return StmtError(); 7563 7564 // Build the call to the assignment operator. 7565 7566 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7567 OpEqualRef.takeAs<Expr>(), 7568 Loc, &From, 1, Loc); 7569 if (Call.isInvalid()) 7570 return StmtError(); 7571 7572 return S.Owned(Call.takeAs<Stmt>()); 7573 } 7574 7575 // - if the subobject is of scalar type, the built-in assignment 7576 // operator is used. 7577 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7578 if (!ArrayTy) { 7579 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7580 if (Assignment.isInvalid()) 7581 return StmtError(); 7582 7583 return S.Owned(Assignment.takeAs<Stmt>()); 7584 } 7585 7586 // - if the subobject is an array, each element is assigned, in the 7587 // manner appropriate to the element type; 7588 7589 // Construct a loop over the array bounds, e.g., 7590 // 7591 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7592 // 7593 // that will copy each of the array elements. 7594 QualType SizeType = S.Context.getSizeType(); 7595 7596 // Create the iteration variable. 7597 IdentifierInfo *IterationVarName = 0; 7598 { 7599 llvm::SmallString<8> Str; 7600 llvm::raw_svector_ostream OS(Str); 7601 OS << "__i" << Depth; 7602 IterationVarName = &S.Context.Idents.get(OS.str()); 7603 } 7604 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7605 IterationVarName, SizeType, 7606 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7607 SC_None, SC_None); 7608 7609 // Initialize the iteration variable to zero. 7610 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7611 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7612 7613 // Create a reference to the iteration variable; we'll use this several 7614 // times throughout. 7615 Expr *IterationVarRef 7616 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7617 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7618 7619 // Create the DeclStmt that holds the iteration variable. 7620 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7621 7622 // Create the comparison against the array bound. 7623 llvm::APInt Upper 7624 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7625 Expr *Comparison 7626 = new (S.Context) BinaryOperator(IterationVarRef, 7627 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7628 BO_NE, S.Context.BoolTy, 7629 VK_RValue, OK_Ordinary, Loc); 7630 7631 // Create the pre-increment of the iteration variable. 7632 Expr *Increment 7633 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7634 VK_LValue, OK_Ordinary, Loc); 7635 7636 // Subscript the "from" and "to" expressions with the iteration variable. 7637 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7638 IterationVarRef, Loc)); 7639 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7640 IterationVarRef, Loc)); 7641 if (!Copying) // Cast to rvalue 7642 From = CastForMoving(S, From); 7643 7644 // Build the copy/move for an individual element of the array. 7645 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7646 To, From, CopyingBaseSubobject, 7647 Copying, Depth + 1); 7648 if (Copy.isInvalid()) 7649 return StmtError(); 7650 7651 // Construct the loop that copies all elements of this array. 7652 return S.ActOnForStmt(Loc, Loc, InitStmt, 7653 S.MakeFullExpr(Comparison), 7654 0, S.MakeFullExpr(Increment), 7655 Loc, Copy.take()); 7656} 7657 7658std::pair<Sema::ImplicitExceptionSpecification, bool> 7659Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7660 CXXRecordDecl *ClassDecl) { 7661 if (ClassDecl->isInvalidDecl()) 7662 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7663 7664 // C++ [class.copy]p10: 7665 // If the class definition does not explicitly declare a copy 7666 // assignment operator, one is declared implicitly. 7667 // The implicitly-defined copy assignment operator for a class X 7668 // will have the form 7669 // 7670 // X& X::operator=(const X&) 7671 // 7672 // if 7673 bool HasConstCopyAssignment = true; 7674 7675 // -- each direct base class B of X has a copy assignment operator 7676 // whose parameter is of type const B&, const volatile B& or B, 7677 // and 7678 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7679 BaseEnd = ClassDecl->bases_end(); 7680 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7681 // We'll handle this below 7682 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7683 continue; 7684 7685 assert(!Base->getType()->isDependentType() && 7686 "Cannot generate implicit members for class with dependent bases."); 7687 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7688 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7689 &HasConstCopyAssignment); 7690 } 7691 7692 // In C++11, the above citation has "or virtual" added 7693 if (LangOpts.CPlusPlus0x) { 7694 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7695 BaseEnd = ClassDecl->vbases_end(); 7696 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7697 assert(!Base->getType()->isDependentType() && 7698 "Cannot generate implicit members for class with dependent bases."); 7699 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7700 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7701 &HasConstCopyAssignment); 7702 } 7703 } 7704 7705 // -- for all the nonstatic data members of X that are of a class 7706 // type M (or array thereof), each such class type has a copy 7707 // assignment operator whose parameter is of type const M&, 7708 // const volatile M& or M. 7709 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7710 FieldEnd = ClassDecl->field_end(); 7711 HasConstCopyAssignment && Field != FieldEnd; 7712 ++Field) { 7713 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7714 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7715 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7716 &HasConstCopyAssignment); 7717 } 7718 } 7719 7720 // Otherwise, the implicitly declared copy assignment operator will 7721 // have the form 7722 // 7723 // X& X::operator=(X&) 7724 7725 // C++ [except.spec]p14: 7726 // An implicitly declared special member function (Clause 12) shall have an 7727 // exception-specification. [...] 7728 7729 // It is unspecified whether or not an implicit copy assignment operator 7730 // attempts to deduplicate calls to assignment operators of virtual bases are 7731 // made. As such, this exception specification is effectively unspecified. 7732 // Based on a similar decision made for constness in C++0x, we're erring on 7733 // the side of assuming such calls to be made regardless of whether they 7734 // actually happen. 7735 ImplicitExceptionSpecification ExceptSpec(Context); 7736 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7737 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7738 BaseEnd = ClassDecl->bases_end(); 7739 Base != BaseEnd; ++Base) { 7740 if (Base->isVirtual()) 7741 continue; 7742 7743 CXXRecordDecl *BaseClassDecl 7744 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7745 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7746 ArgQuals, false, 0)) 7747 ExceptSpec.CalledDecl(CopyAssign); 7748 } 7749 7750 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7751 BaseEnd = ClassDecl->vbases_end(); 7752 Base != BaseEnd; ++Base) { 7753 CXXRecordDecl *BaseClassDecl 7754 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7755 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7756 ArgQuals, false, 0)) 7757 ExceptSpec.CalledDecl(CopyAssign); 7758 } 7759 7760 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7761 FieldEnd = ClassDecl->field_end(); 7762 Field != FieldEnd; 7763 ++Field) { 7764 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7765 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7766 if (CXXMethodDecl *CopyAssign = 7767 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7768 ExceptSpec.CalledDecl(CopyAssign); 7769 } 7770 } 7771 7772 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7773} 7774 7775CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7776 // Note: The following rules are largely analoguous to the copy 7777 // constructor rules. Note that virtual bases are not taken into account 7778 // for determining the argument type of the operator. Note also that 7779 // operators taking an object instead of a reference are allowed. 7780 7781 ImplicitExceptionSpecification Spec(Context); 7782 bool Const; 7783 llvm::tie(Spec, Const) = 7784 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7785 7786 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7787 QualType RetType = Context.getLValueReferenceType(ArgType); 7788 if (Const) 7789 ArgType = ArgType.withConst(); 7790 ArgType = Context.getLValueReferenceType(ArgType); 7791 7792 // An implicitly-declared copy assignment operator is an inline public 7793 // member of its class. 7794 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7795 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7796 SourceLocation ClassLoc = ClassDecl->getLocation(); 7797 DeclarationNameInfo NameInfo(Name, ClassLoc); 7798 CXXMethodDecl *CopyAssignment 7799 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7800 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7801 /*TInfo=*/0, /*isStatic=*/false, 7802 /*StorageClassAsWritten=*/SC_None, 7803 /*isInline=*/true, /*isConstexpr=*/false, 7804 SourceLocation()); 7805 CopyAssignment->setAccess(AS_public); 7806 CopyAssignment->setDefaulted(); 7807 CopyAssignment->setImplicit(); 7808 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7809 7810 // Add the parameter to the operator. 7811 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7812 ClassLoc, ClassLoc, /*Id=*/0, 7813 ArgType, /*TInfo=*/0, 7814 SC_None, 7815 SC_None, 0); 7816 CopyAssignment->setParams(FromParam); 7817 7818 // Note that we have added this copy-assignment operator. 7819 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7820 7821 if (Scope *S = getScopeForContext(ClassDecl)) 7822 PushOnScopeChains(CopyAssignment, S, false); 7823 ClassDecl->addDecl(CopyAssignment); 7824 7825 // C++0x [class.copy]p18: 7826 // ... If the class definition declares a move constructor or move 7827 // assignment operator, the implicitly declared copy assignment operator is 7828 // defined as deleted; ... 7829 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7830 ClassDecl->hasUserDeclaredMoveAssignment() || 7831 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7832 CopyAssignment->setDeletedAsWritten(); 7833 7834 AddOverriddenMethods(ClassDecl, CopyAssignment); 7835 return CopyAssignment; 7836} 7837 7838void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7839 CXXMethodDecl *CopyAssignOperator) { 7840 assert((CopyAssignOperator->isDefaulted() && 7841 CopyAssignOperator->isOverloadedOperator() && 7842 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7843 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7844 "DefineImplicitCopyAssignment called for wrong function"); 7845 7846 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7847 7848 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7849 CopyAssignOperator->setInvalidDecl(); 7850 return; 7851 } 7852 7853 CopyAssignOperator->setUsed(); 7854 7855 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7856 DiagnosticErrorTrap Trap(Diags); 7857 7858 // C++0x [class.copy]p30: 7859 // The implicitly-defined or explicitly-defaulted copy assignment operator 7860 // for a non-union class X performs memberwise copy assignment of its 7861 // subobjects. The direct base classes of X are assigned first, in the 7862 // order of their declaration in the base-specifier-list, and then the 7863 // immediate non-static data members of X are assigned, in the order in 7864 // which they were declared in the class definition. 7865 7866 // The statements that form the synthesized function body. 7867 ASTOwningVector<Stmt*> Statements(*this); 7868 7869 // The parameter for the "other" object, which we are copying from. 7870 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7871 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7872 QualType OtherRefType = Other->getType(); 7873 if (const LValueReferenceType *OtherRef 7874 = OtherRefType->getAs<LValueReferenceType>()) { 7875 OtherRefType = OtherRef->getPointeeType(); 7876 OtherQuals = OtherRefType.getQualifiers(); 7877 } 7878 7879 // Our location for everything implicitly-generated. 7880 SourceLocation Loc = CopyAssignOperator->getLocation(); 7881 7882 // Construct a reference to the "other" object. We'll be using this 7883 // throughout the generated ASTs. 7884 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7885 assert(OtherRef && "Reference to parameter cannot fail!"); 7886 7887 // Construct the "this" pointer. We'll be using this throughout the generated 7888 // ASTs. 7889 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7890 assert(This && "Reference to this cannot fail!"); 7891 7892 // Assign base classes. 7893 bool Invalid = false; 7894 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7895 E = ClassDecl->bases_end(); Base != E; ++Base) { 7896 // Form the assignment: 7897 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7898 QualType BaseType = Base->getType().getUnqualifiedType(); 7899 if (!BaseType->isRecordType()) { 7900 Invalid = true; 7901 continue; 7902 } 7903 7904 CXXCastPath BasePath; 7905 BasePath.push_back(Base); 7906 7907 // Construct the "from" expression, which is an implicit cast to the 7908 // appropriately-qualified base type. 7909 Expr *From = OtherRef; 7910 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7911 CK_UncheckedDerivedToBase, 7912 VK_LValue, &BasePath).take(); 7913 7914 // Dereference "this". 7915 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7916 7917 // Implicitly cast "this" to the appropriately-qualified base type. 7918 To = ImpCastExprToType(To.take(), 7919 Context.getCVRQualifiedType(BaseType, 7920 CopyAssignOperator->getTypeQualifiers()), 7921 CK_UncheckedDerivedToBase, 7922 VK_LValue, &BasePath); 7923 7924 // Build the copy. 7925 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7926 To.get(), From, 7927 /*CopyingBaseSubobject=*/true, 7928 /*Copying=*/true); 7929 if (Copy.isInvalid()) { 7930 Diag(CurrentLocation, diag::note_member_synthesized_at) 7931 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7932 CopyAssignOperator->setInvalidDecl(); 7933 return; 7934 } 7935 7936 // Success! Record the copy. 7937 Statements.push_back(Copy.takeAs<Expr>()); 7938 } 7939 7940 // \brief Reference to the __builtin_memcpy function. 7941 Expr *BuiltinMemCpyRef = 0; 7942 // \brief Reference to the __builtin_objc_memmove_collectable function. 7943 Expr *CollectableMemCpyRef = 0; 7944 7945 // Assign non-static members. 7946 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7947 FieldEnd = ClassDecl->field_end(); 7948 Field != FieldEnd; ++Field) { 7949 if (Field->isUnnamedBitfield()) 7950 continue; 7951 7952 // Check for members of reference type; we can't copy those. 7953 if (Field->getType()->isReferenceType()) { 7954 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7955 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7956 Diag(Field->getLocation(), diag::note_declared_at); 7957 Diag(CurrentLocation, diag::note_member_synthesized_at) 7958 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7959 Invalid = true; 7960 continue; 7961 } 7962 7963 // Check for members of const-qualified, non-class type. 7964 QualType BaseType = Context.getBaseElementType(Field->getType()); 7965 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7966 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7967 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7968 Diag(Field->getLocation(), diag::note_declared_at); 7969 Diag(CurrentLocation, diag::note_member_synthesized_at) 7970 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7971 Invalid = true; 7972 continue; 7973 } 7974 7975 // Suppress assigning zero-width bitfields. 7976 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7977 continue; 7978 7979 QualType FieldType = Field->getType().getNonReferenceType(); 7980 if (FieldType->isIncompleteArrayType()) { 7981 assert(ClassDecl->hasFlexibleArrayMember() && 7982 "Incomplete array type is not valid"); 7983 continue; 7984 } 7985 7986 // Build references to the field in the object we're copying from and to. 7987 CXXScopeSpec SS; // Intentionally empty 7988 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7989 LookupMemberName); 7990 MemberLookup.addDecl(*Field); 7991 MemberLookup.resolveKind(); 7992 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7993 Loc, /*IsArrow=*/false, 7994 SS, 0, MemberLookup, 0); 7995 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7996 Loc, /*IsArrow=*/true, 7997 SS, 0, MemberLookup, 0); 7998 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7999 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8000 8001 // If the field should be copied with __builtin_memcpy rather than via 8002 // explicit assignments, do so. This optimization only applies for arrays 8003 // of scalars and arrays of class type with trivial copy-assignment 8004 // operators. 8005 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8006 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8007 // Compute the size of the memory buffer to be copied. 8008 QualType SizeType = Context.getSizeType(); 8009 llvm::APInt Size(Context.getTypeSize(SizeType), 8010 Context.getTypeSizeInChars(BaseType).getQuantity()); 8011 for (const ConstantArrayType *Array 8012 = Context.getAsConstantArrayType(FieldType); 8013 Array; 8014 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8015 llvm::APInt ArraySize 8016 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8017 Size *= ArraySize; 8018 } 8019 8020 // Take the address of the field references for "from" and "to". 8021 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8022 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8023 8024 bool NeedsCollectableMemCpy = 8025 (BaseType->isRecordType() && 8026 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8027 8028 if (NeedsCollectableMemCpy) { 8029 if (!CollectableMemCpyRef) { 8030 // Create a reference to the __builtin_objc_memmove_collectable function. 8031 LookupResult R(*this, 8032 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8033 Loc, LookupOrdinaryName); 8034 LookupName(R, TUScope, true); 8035 8036 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8037 if (!CollectableMemCpy) { 8038 // Something went horribly wrong earlier, and we will have 8039 // complained about it. 8040 Invalid = true; 8041 continue; 8042 } 8043 8044 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8045 CollectableMemCpy->getType(), 8046 VK_LValue, Loc, 0).take(); 8047 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8048 } 8049 } 8050 // Create a reference to the __builtin_memcpy builtin function. 8051 else if (!BuiltinMemCpyRef) { 8052 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8053 LookupOrdinaryName); 8054 LookupName(R, TUScope, true); 8055 8056 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8057 if (!BuiltinMemCpy) { 8058 // Something went horribly wrong earlier, and we will have complained 8059 // about it. 8060 Invalid = true; 8061 continue; 8062 } 8063 8064 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8065 BuiltinMemCpy->getType(), 8066 VK_LValue, Loc, 0).take(); 8067 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8068 } 8069 8070 ASTOwningVector<Expr*> CallArgs(*this); 8071 CallArgs.push_back(To.takeAs<Expr>()); 8072 CallArgs.push_back(From.takeAs<Expr>()); 8073 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8074 ExprResult Call = ExprError(); 8075 if (NeedsCollectableMemCpy) 8076 Call = ActOnCallExpr(/*Scope=*/0, 8077 CollectableMemCpyRef, 8078 Loc, move_arg(CallArgs), 8079 Loc); 8080 else 8081 Call = ActOnCallExpr(/*Scope=*/0, 8082 BuiltinMemCpyRef, 8083 Loc, move_arg(CallArgs), 8084 Loc); 8085 8086 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8087 Statements.push_back(Call.takeAs<Expr>()); 8088 continue; 8089 } 8090 8091 // Build the copy of this field. 8092 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8093 To.get(), From.get(), 8094 /*CopyingBaseSubobject=*/false, 8095 /*Copying=*/true); 8096 if (Copy.isInvalid()) { 8097 Diag(CurrentLocation, diag::note_member_synthesized_at) 8098 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8099 CopyAssignOperator->setInvalidDecl(); 8100 return; 8101 } 8102 8103 // Success! Record the copy. 8104 Statements.push_back(Copy.takeAs<Stmt>()); 8105 } 8106 8107 if (!Invalid) { 8108 // Add a "return *this;" 8109 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8110 8111 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8112 if (Return.isInvalid()) 8113 Invalid = true; 8114 else { 8115 Statements.push_back(Return.takeAs<Stmt>()); 8116 8117 if (Trap.hasErrorOccurred()) { 8118 Diag(CurrentLocation, diag::note_member_synthesized_at) 8119 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8120 Invalid = true; 8121 } 8122 } 8123 } 8124 8125 if (Invalid) { 8126 CopyAssignOperator->setInvalidDecl(); 8127 return; 8128 } 8129 8130 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8131 /*isStmtExpr=*/false); 8132 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8133 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8134 8135 if (ASTMutationListener *L = getASTMutationListener()) { 8136 L->CompletedImplicitDefinition(CopyAssignOperator); 8137 } 8138} 8139 8140Sema::ImplicitExceptionSpecification 8141Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8142 ImplicitExceptionSpecification ExceptSpec(Context); 8143 8144 if (ClassDecl->isInvalidDecl()) 8145 return ExceptSpec; 8146 8147 // C++0x [except.spec]p14: 8148 // An implicitly declared special member function (Clause 12) shall have an 8149 // exception-specification. [...] 8150 8151 // It is unspecified whether or not an implicit move assignment operator 8152 // attempts to deduplicate calls to assignment operators of virtual bases are 8153 // made. As such, this exception specification is effectively unspecified. 8154 // Based on a similar decision made for constness in C++0x, we're erring on 8155 // the side of assuming such calls to be made regardless of whether they 8156 // actually happen. 8157 // Note that a move constructor is not implicitly declared when there are 8158 // virtual bases, but it can still be user-declared and explicitly defaulted. 8159 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8160 BaseEnd = ClassDecl->bases_end(); 8161 Base != BaseEnd; ++Base) { 8162 if (Base->isVirtual()) 8163 continue; 8164 8165 CXXRecordDecl *BaseClassDecl 8166 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8167 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8168 false, 0)) 8169 ExceptSpec.CalledDecl(MoveAssign); 8170 } 8171 8172 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8173 BaseEnd = ClassDecl->vbases_end(); 8174 Base != BaseEnd; ++Base) { 8175 CXXRecordDecl *BaseClassDecl 8176 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8177 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8178 false, 0)) 8179 ExceptSpec.CalledDecl(MoveAssign); 8180 } 8181 8182 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8183 FieldEnd = ClassDecl->field_end(); 8184 Field != FieldEnd; 8185 ++Field) { 8186 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8187 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8188 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8189 false, 0)) 8190 ExceptSpec.CalledDecl(MoveAssign); 8191 } 8192 } 8193 8194 return ExceptSpec; 8195} 8196 8197CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8198 // Note: The following rules are largely analoguous to the move 8199 // constructor rules. 8200 8201 ImplicitExceptionSpecification Spec( 8202 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8203 8204 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8205 QualType RetType = Context.getLValueReferenceType(ArgType); 8206 ArgType = Context.getRValueReferenceType(ArgType); 8207 8208 // An implicitly-declared move assignment operator is an inline public 8209 // member of its class. 8210 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8211 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8212 SourceLocation ClassLoc = ClassDecl->getLocation(); 8213 DeclarationNameInfo NameInfo(Name, ClassLoc); 8214 CXXMethodDecl *MoveAssignment 8215 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8216 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8217 /*TInfo=*/0, /*isStatic=*/false, 8218 /*StorageClassAsWritten=*/SC_None, 8219 /*isInline=*/true, 8220 /*isConstexpr=*/false, 8221 SourceLocation()); 8222 MoveAssignment->setAccess(AS_public); 8223 MoveAssignment->setDefaulted(); 8224 MoveAssignment->setImplicit(); 8225 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8226 8227 // Add the parameter to the operator. 8228 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8229 ClassLoc, ClassLoc, /*Id=*/0, 8230 ArgType, /*TInfo=*/0, 8231 SC_None, 8232 SC_None, 0); 8233 MoveAssignment->setParams(FromParam); 8234 8235 // Note that we have added this copy-assignment operator. 8236 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8237 8238 // C++0x [class.copy]p9: 8239 // If the definition of a class X does not explicitly declare a move 8240 // assignment operator, one will be implicitly declared as defaulted if and 8241 // only if: 8242 // [...] 8243 // - the move assignment operator would not be implicitly defined as 8244 // deleted. 8245 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8246 // Cache this result so that we don't try to generate this over and over 8247 // on every lookup, leaking memory and wasting time. 8248 ClassDecl->setFailedImplicitMoveAssignment(); 8249 return 0; 8250 } 8251 8252 if (Scope *S = getScopeForContext(ClassDecl)) 8253 PushOnScopeChains(MoveAssignment, S, false); 8254 ClassDecl->addDecl(MoveAssignment); 8255 8256 AddOverriddenMethods(ClassDecl, MoveAssignment); 8257 return MoveAssignment; 8258} 8259 8260void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8261 CXXMethodDecl *MoveAssignOperator) { 8262 assert((MoveAssignOperator->isDefaulted() && 8263 MoveAssignOperator->isOverloadedOperator() && 8264 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8265 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8266 "DefineImplicitMoveAssignment called for wrong function"); 8267 8268 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8269 8270 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8271 MoveAssignOperator->setInvalidDecl(); 8272 return; 8273 } 8274 8275 MoveAssignOperator->setUsed(); 8276 8277 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8278 DiagnosticErrorTrap Trap(Diags); 8279 8280 // C++0x [class.copy]p28: 8281 // The implicitly-defined or move assignment operator for a non-union class 8282 // X performs memberwise move assignment of its subobjects. The direct base 8283 // classes of X are assigned first, in the order of their declaration in the 8284 // base-specifier-list, and then the immediate non-static data members of X 8285 // are assigned, in the order in which they were declared in the class 8286 // definition. 8287 8288 // The statements that form the synthesized function body. 8289 ASTOwningVector<Stmt*> Statements(*this); 8290 8291 // The parameter for the "other" object, which we are move from. 8292 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8293 QualType OtherRefType = Other->getType()-> 8294 getAs<RValueReferenceType>()->getPointeeType(); 8295 assert(OtherRefType.getQualifiers() == 0 && 8296 "Bad argument type of defaulted move assignment"); 8297 8298 // Our location for everything implicitly-generated. 8299 SourceLocation Loc = MoveAssignOperator->getLocation(); 8300 8301 // Construct a reference to the "other" object. We'll be using this 8302 // throughout the generated ASTs. 8303 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8304 assert(OtherRef && "Reference to parameter cannot fail!"); 8305 // Cast to rvalue. 8306 OtherRef = CastForMoving(*this, OtherRef); 8307 8308 // Construct the "this" pointer. We'll be using this throughout the generated 8309 // ASTs. 8310 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8311 assert(This && "Reference to this cannot fail!"); 8312 8313 // Assign base classes. 8314 bool Invalid = false; 8315 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8316 E = ClassDecl->bases_end(); Base != E; ++Base) { 8317 // Form the assignment: 8318 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8319 QualType BaseType = Base->getType().getUnqualifiedType(); 8320 if (!BaseType->isRecordType()) { 8321 Invalid = true; 8322 continue; 8323 } 8324 8325 CXXCastPath BasePath; 8326 BasePath.push_back(Base); 8327 8328 // Construct the "from" expression, which is an implicit cast to the 8329 // appropriately-qualified base type. 8330 Expr *From = OtherRef; 8331 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8332 VK_XValue, &BasePath).take(); 8333 8334 // Dereference "this". 8335 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8336 8337 // Implicitly cast "this" to the appropriately-qualified base type. 8338 To = ImpCastExprToType(To.take(), 8339 Context.getCVRQualifiedType(BaseType, 8340 MoveAssignOperator->getTypeQualifiers()), 8341 CK_UncheckedDerivedToBase, 8342 VK_LValue, &BasePath); 8343 8344 // Build the move. 8345 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8346 To.get(), From, 8347 /*CopyingBaseSubobject=*/true, 8348 /*Copying=*/false); 8349 if (Move.isInvalid()) { 8350 Diag(CurrentLocation, diag::note_member_synthesized_at) 8351 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8352 MoveAssignOperator->setInvalidDecl(); 8353 return; 8354 } 8355 8356 // Success! Record the move. 8357 Statements.push_back(Move.takeAs<Expr>()); 8358 } 8359 8360 // \brief Reference to the __builtin_memcpy function. 8361 Expr *BuiltinMemCpyRef = 0; 8362 // \brief Reference to the __builtin_objc_memmove_collectable function. 8363 Expr *CollectableMemCpyRef = 0; 8364 8365 // Assign non-static members. 8366 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8367 FieldEnd = ClassDecl->field_end(); 8368 Field != FieldEnd; ++Field) { 8369 if (Field->isUnnamedBitfield()) 8370 continue; 8371 8372 // Check for members of reference type; we can't move those. 8373 if (Field->getType()->isReferenceType()) { 8374 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8375 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8376 Diag(Field->getLocation(), diag::note_declared_at); 8377 Diag(CurrentLocation, diag::note_member_synthesized_at) 8378 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8379 Invalid = true; 8380 continue; 8381 } 8382 8383 // Check for members of const-qualified, non-class type. 8384 QualType BaseType = Context.getBaseElementType(Field->getType()); 8385 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8386 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8387 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8388 Diag(Field->getLocation(), diag::note_declared_at); 8389 Diag(CurrentLocation, diag::note_member_synthesized_at) 8390 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8391 Invalid = true; 8392 continue; 8393 } 8394 8395 // Suppress assigning zero-width bitfields. 8396 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8397 continue; 8398 8399 QualType FieldType = Field->getType().getNonReferenceType(); 8400 if (FieldType->isIncompleteArrayType()) { 8401 assert(ClassDecl->hasFlexibleArrayMember() && 8402 "Incomplete array type is not valid"); 8403 continue; 8404 } 8405 8406 // Build references to the field in the object we're copying from and to. 8407 CXXScopeSpec SS; // Intentionally empty 8408 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8409 LookupMemberName); 8410 MemberLookup.addDecl(*Field); 8411 MemberLookup.resolveKind(); 8412 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8413 Loc, /*IsArrow=*/false, 8414 SS, 0, MemberLookup, 0); 8415 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8416 Loc, /*IsArrow=*/true, 8417 SS, 0, MemberLookup, 0); 8418 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8419 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8420 8421 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8422 "Member reference with rvalue base must be rvalue except for reference " 8423 "members, which aren't allowed for move assignment."); 8424 8425 // If the field should be copied with __builtin_memcpy rather than via 8426 // explicit assignments, do so. This optimization only applies for arrays 8427 // of scalars and arrays of class type with trivial move-assignment 8428 // operators. 8429 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8430 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8431 // Compute the size of the memory buffer to be copied. 8432 QualType SizeType = Context.getSizeType(); 8433 llvm::APInt Size(Context.getTypeSize(SizeType), 8434 Context.getTypeSizeInChars(BaseType).getQuantity()); 8435 for (const ConstantArrayType *Array 8436 = Context.getAsConstantArrayType(FieldType); 8437 Array; 8438 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8439 llvm::APInt ArraySize 8440 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8441 Size *= ArraySize; 8442 } 8443 8444 // Take the address of the field references for "from" and "to". We 8445 // directly construct UnaryOperators here because semantic analysis 8446 // does not permit us to take the address of an xvalue. 8447 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8448 Context.getPointerType(From.get()->getType()), 8449 VK_RValue, OK_Ordinary, Loc); 8450 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8451 Context.getPointerType(To.get()->getType()), 8452 VK_RValue, OK_Ordinary, Loc); 8453 8454 bool NeedsCollectableMemCpy = 8455 (BaseType->isRecordType() && 8456 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8457 8458 if (NeedsCollectableMemCpy) { 8459 if (!CollectableMemCpyRef) { 8460 // Create a reference to the __builtin_objc_memmove_collectable function. 8461 LookupResult R(*this, 8462 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8463 Loc, LookupOrdinaryName); 8464 LookupName(R, TUScope, true); 8465 8466 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8467 if (!CollectableMemCpy) { 8468 // Something went horribly wrong earlier, and we will have 8469 // complained about it. 8470 Invalid = true; 8471 continue; 8472 } 8473 8474 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8475 CollectableMemCpy->getType(), 8476 VK_LValue, Loc, 0).take(); 8477 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8478 } 8479 } 8480 // Create a reference to the __builtin_memcpy builtin function. 8481 else if (!BuiltinMemCpyRef) { 8482 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8483 LookupOrdinaryName); 8484 LookupName(R, TUScope, true); 8485 8486 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8487 if (!BuiltinMemCpy) { 8488 // Something went horribly wrong earlier, and we will have complained 8489 // about it. 8490 Invalid = true; 8491 continue; 8492 } 8493 8494 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8495 BuiltinMemCpy->getType(), 8496 VK_LValue, Loc, 0).take(); 8497 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8498 } 8499 8500 ASTOwningVector<Expr*> CallArgs(*this); 8501 CallArgs.push_back(To.takeAs<Expr>()); 8502 CallArgs.push_back(From.takeAs<Expr>()); 8503 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8504 ExprResult Call = ExprError(); 8505 if (NeedsCollectableMemCpy) 8506 Call = ActOnCallExpr(/*Scope=*/0, 8507 CollectableMemCpyRef, 8508 Loc, move_arg(CallArgs), 8509 Loc); 8510 else 8511 Call = ActOnCallExpr(/*Scope=*/0, 8512 BuiltinMemCpyRef, 8513 Loc, move_arg(CallArgs), 8514 Loc); 8515 8516 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8517 Statements.push_back(Call.takeAs<Expr>()); 8518 continue; 8519 } 8520 8521 // Build the move of this field. 8522 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8523 To.get(), From.get(), 8524 /*CopyingBaseSubobject=*/false, 8525 /*Copying=*/false); 8526 if (Move.isInvalid()) { 8527 Diag(CurrentLocation, diag::note_member_synthesized_at) 8528 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8529 MoveAssignOperator->setInvalidDecl(); 8530 return; 8531 } 8532 8533 // Success! Record the copy. 8534 Statements.push_back(Move.takeAs<Stmt>()); 8535 } 8536 8537 if (!Invalid) { 8538 // Add a "return *this;" 8539 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8540 8541 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8542 if (Return.isInvalid()) 8543 Invalid = true; 8544 else { 8545 Statements.push_back(Return.takeAs<Stmt>()); 8546 8547 if (Trap.hasErrorOccurred()) { 8548 Diag(CurrentLocation, diag::note_member_synthesized_at) 8549 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8550 Invalid = true; 8551 } 8552 } 8553 } 8554 8555 if (Invalid) { 8556 MoveAssignOperator->setInvalidDecl(); 8557 return; 8558 } 8559 8560 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8561 /*isStmtExpr=*/false); 8562 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8563 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8564 8565 if (ASTMutationListener *L = getASTMutationListener()) { 8566 L->CompletedImplicitDefinition(MoveAssignOperator); 8567 } 8568} 8569 8570std::pair<Sema::ImplicitExceptionSpecification, bool> 8571Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8572 if (ClassDecl->isInvalidDecl()) 8573 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8574 8575 // C++ [class.copy]p5: 8576 // The implicitly-declared copy constructor for a class X will 8577 // have the form 8578 // 8579 // X::X(const X&) 8580 // 8581 // if 8582 // FIXME: It ought to be possible to store this on the record. 8583 bool HasConstCopyConstructor = true; 8584 8585 // -- each direct or virtual base class B of X has a copy 8586 // constructor whose first parameter is of type const B& or 8587 // const volatile B&, and 8588 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8589 BaseEnd = ClassDecl->bases_end(); 8590 HasConstCopyConstructor && Base != BaseEnd; 8591 ++Base) { 8592 // Virtual bases are handled below. 8593 if (Base->isVirtual()) 8594 continue; 8595 8596 CXXRecordDecl *BaseClassDecl 8597 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8598 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8599 &HasConstCopyConstructor); 8600 } 8601 8602 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8603 BaseEnd = ClassDecl->vbases_end(); 8604 HasConstCopyConstructor && Base != BaseEnd; 8605 ++Base) { 8606 CXXRecordDecl *BaseClassDecl 8607 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8608 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8609 &HasConstCopyConstructor); 8610 } 8611 8612 // -- for all the nonstatic data members of X that are of a 8613 // class type M (or array thereof), each such class type 8614 // has a copy constructor whose first parameter is of type 8615 // const M& or const volatile M&. 8616 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8617 FieldEnd = ClassDecl->field_end(); 8618 HasConstCopyConstructor && Field != FieldEnd; 8619 ++Field) { 8620 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8621 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8622 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8623 &HasConstCopyConstructor); 8624 } 8625 } 8626 // Otherwise, the implicitly declared copy constructor will have 8627 // the form 8628 // 8629 // X::X(X&) 8630 8631 // C++ [except.spec]p14: 8632 // An implicitly declared special member function (Clause 12) shall have an 8633 // exception-specification. [...] 8634 ImplicitExceptionSpecification ExceptSpec(Context); 8635 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8636 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8637 BaseEnd = ClassDecl->bases_end(); 8638 Base != BaseEnd; 8639 ++Base) { 8640 // Virtual bases are handled below. 8641 if (Base->isVirtual()) 8642 continue; 8643 8644 CXXRecordDecl *BaseClassDecl 8645 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8646 if (CXXConstructorDecl *CopyConstructor = 8647 LookupCopyingConstructor(BaseClassDecl, Quals)) 8648 ExceptSpec.CalledDecl(CopyConstructor); 8649 } 8650 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8651 BaseEnd = ClassDecl->vbases_end(); 8652 Base != BaseEnd; 8653 ++Base) { 8654 CXXRecordDecl *BaseClassDecl 8655 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8656 if (CXXConstructorDecl *CopyConstructor = 8657 LookupCopyingConstructor(BaseClassDecl, Quals)) 8658 ExceptSpec.CalledDecl(CopyConstructor); 8659 } 8660 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8661 FieldEnd = ClassDecl->field_end(); 8662 Field != FieldEnd; 8663 ++Field) { 8664 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8665 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8666 if (CXXConstructorDecl *CopyConstructor = 8667 LookupCopyingConstructor(FieldClassDecl, Quals)) 8668 ExceptSpec.CalledDecl(CopyConstructor); 8669 } 8670 } 8671 8672 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8673} 8674 8675CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8676 CXXRecordDecl *ClassDecl) { 8677 // C++ [class.copy]p4: 8678 // If the class definition does not explicitly declare a copy 8679 // constructor, one is declared implicitly. 8680 8681 ImplicitExceptionSpecification Spec(Context); 8682 bool Const; 8683 llvm::tie(Spec, Const) = 8684 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8685 8686 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8687 QualType ArgType = ClassType; 8688 if (Const) 8689 ArgType = ArgType.withConst(); 8690 ArgType = Context.getLValueReferenceType(ArgType); 8691 8692 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8693 8694 DeclarationName Name 8695 = Context.DeclarationNames.getCXXConstructorName( 8696 Context.getCanonicalType(ClassType)); 8697 SourceLocation ClassLoc = ClassDecl->getLocation(); 8698 DeclarationNameInfo NameInfo(Name, ClassLoc); 8699 8700 // An implicitly-declared copy constructor is an inline public 8701 // member of its class. 8702 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8703 Context, ClassDecl, ClassLoc, NameInfo, 8704 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8705 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8706 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8707 getLangOptions().CPlusPlus0x); 8708 CopyConstructor->setAccess(AS_public); 8709 CopyConstructor->setDefaulted(); 8710 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8711 8712 // Note that we have declared this constructor. 8713 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8714 8715 // Add the parameter to the constructor. 8716 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8717 ClassLoc, ClassLoc, 8718 /*IdentifierInfo=*/0, 8719 ArgType, /*TInfo=*/0, 8720 SC_None, 8721 SC_None, 0); 8722 CopyConstructor->setParams(FromParam); 8723 8724 if (Scope *S = getScopeForContext(ClassDecl)) 8725 PushOnScopeChains(CopyConstructor, S, false); 8726 ClassDecl->addDecl(CopyConstructor); 8727 8728 // C++0x [class.copy]p7: 8729 // ... If the class definition declares a move constructor or move 8730 // assignment operator, the implicitly declared constructor is defined as 8731 // deleted; ... 8732 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8733 ClassDecl->hasUserDeclaredMoveAssignment() || 8734 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8735 CopyConstructor->setDeletedAsWritten(); 8736 8737 return CopyConstructor; 8738} 8739 8740void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8741 CXXConstructorDecl *CopyConstructor) { 8742 assert((CopyConstructor->isDefaulted() && 8743 CopyConstructor->isCopyConstructor() && 8744 !CopyConstructor->doesThisDeclarationHaveABody()) && 8745 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8746 8747 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8748 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8749 8750 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8751 DiagnosticErrorTrap Trap(Diags); 8752 8753 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8754 Trap.hasErrorOccurred()) { 8755 Diag(CurrentLocation, diag::note_member_synthesized_at) 8756 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8757 CopyConstructor->setInvalidDecl(); 8758 } else { 8759 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8760 CopyConstructor->getLocation(), 8761 MultiStmtArg(*this, 0, 0), 8762 /*isStmtExpr=*/false) 8763 .takeAs<Stmt>()); 8764 CopyConstructor->setImplicitlyDefined(true); 8765 } 8766 8767 CopyConstructor->setUsed(); 8768 if (ASTMutationListener *L = getASTMutationListener()) { 8769 L->CompletedImplicitDefinition(CopyConstructor); 8770 } 8771} 8772 8773Sema::ImplicitExceptionSpecification 8774Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8775 // C++ [except.spec]p14: 8776 // An implicitly declared special member function (Clause 12) shall have an 8777 // exception-specification. [...] 8778 ImplicitExceptionSpecification ExceptSpec(Context); 8779 if (ClassDecl->isInvalidDecl()) 8780 return ExceptSpec; 8781 8782 // Direct base-class constructors. 8783 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8784 BEnd = ClassDecl->bases_end(); 8785 B != BEnd; ++B) { 8786 if (B->isVirtual()) // Handled below. 8787 continue; 8788 8789 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8790 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8791 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8792 // If this is a deleted function, add it anyway. This might be conformant 8793 // with the standard. This might not. I'm not sure. It might not matter. 8794 if (Constructor) 8795 ExceptSpec.CalledDecl(Constructor); 8796 } 8797 } 8798 8799 // Virtual base-class constructors. 8800 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8801 BEnd = ClassDecl->vbases_end(); 8802 B != BEnd; ++B) { 8803 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8804 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8805 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8806 // If this is a deleted function, add it anyway. This might be conformant 8807 // with the standard. This might not. I'm not sure. It might not matter. 8808 if (Constructor) 8809 ExceptSpec.CalledDecl(Constructor); 8810 } 8811 } 8812 8813 // Field constructors. 8814 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8815 FEnd = ClassDecl->field_end(); 8816 F != FEnd; ++F) { 8817 if (const RecordType *RecordTy 8818 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8819 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8820 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8821 // If this is a deleted function, add it anyway. This might be conformant 8822 // with the standard. This might not. I'm not sure. It might not matter. 8823 // In particular, the problem is that this function never gets called. It 8824 // might just be ill-formed because this function attempts to refer to 8825 // a deleted function here. 8826 if (Constructor) 8827 ExceptSpec.CalledDecl(Constructor); 8828 } 8829 } 8830 8831 return ExceptSpec; 8832} 8833 8834CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8835 CXXRecordDecl *ClassDecl) { 8836 ImplicitExceptionSpecification Spec( 8837 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8838 8839 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8840 QualType ArgType = Context.getRValueReferenceType(ClassType); 8841 8842 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8843 8844 DeclarationName Name 8845 = Context.DeclarationNames.getCXXConstructorName( 8846 Context.getCanonicalType(ClassType)); 8847 SourceLocation ClassLoc = ClassDecl->getLocation(); 8848 DeclarationNameInfo NameInfo(Name, ClassLoc); 8849 8850 // C++0x [class.copy]p11: 8851 // An implicitly-declared copy/move constructor is an inline public 8852 // member of its class. 8853 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8854 Context, ClassDecl, ClassLoc, NameInfo, 8855 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8856 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8857 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8858 getLangOptions().CPlusPlus0x); 8859 MoveConstructor->setAccess(AS_public); 8860 MoveConstructor->setDefaulted(); 8861 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8862 8863 // Add the parameter to the constructor. 8864 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8865 ClassLoc, ClassLoc, 8866 /*IdentifierInfo=*/0, 8867 ArgType, /*TInfo=*/0, 8868 SC_None, 8869 SC_None, 0); 8870 MoveConstructor->setParams(FromParam); 8871 8872 // C++0x [class.copy]p9: 8873 // If the definition of a class X does not explicitly declare a move 8874 // constructor, one will be implicitly declared as defaulted if and only if: 8875 // [...] 8876 // - the move constructor would not be implicitly defined as deleted. 8877 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8878 // Cache this result so that we don't try to generate this over and over 8879 // on every lookup, leaking memory and wasting time. 8880 ClassDecl->setFailedImplicitMoveConstructor(); 8881 return 0; 8882 } 8883 8884 // Note that we have declared this constructor. 8885 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8886 8887 if (Scope *S = getScopeForContext(ClassDecl)) 8888 PushOnScopeChains(MoveConstructor, S, false); 8889 ClassDecl->addDecl(MoveConstructor); 8890 8891 return MoveConstructor; 8892} 8893 8894void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8895 CXXConstructorDecl *MoveConstructor) { 8896 assert((MoveConstructor->isDefaulted() && 8897 MoveConstructor->isMoveConstructor() && 8898 !MoveConstructor->doesThisDeclarationHaveABody()) && 8899 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8900 8901 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8902 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8903 8904 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8905 DiagnosticErrorTrap Trap(Diags); 8906 8907 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8908 Trap.hasErrorOccurred()) { 8909 Diag(CurrentLocation, diag::note_member_synthesized_at) 8910 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8911 MoveConstructor->setInvalidDecl(); 8912 } else { 8913 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8914 MoveConstructor->getLocation(), 8915 MultiStmtArg(*this, 0, 0), 8916 /*isStmtExpr=*/false) 8917 .takeAs<Stmt>()); 8918 MoveConstructor->setImplicitlyDefined(true); 8919 } 8920 8921 MoveConstructor->setUsed(); 8922 8923 if (ASTMutationListener *L = getASTMutationListener()) { 8924 L->CompletedImplicitDefinition(MoveConstructor); 8925 } 8926} 8927 8928ExprResult 8929Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8930 CXXConstructorDecl *Constructor, 8931 MultiExprArg ExprArgs, 8932 bool HadMultipleCandidates, 8933 bool RequiresZeroInit, 8934 unsigned ConstructKind, 8935 SourceRange ParenRange) { 8936 bool Elidable = false; 8937 8938 // C++0x [class.copy]p34: 8939 // When certain criteria are met, an implementation is allowed to 8940 // omit the copy/move construction of a class object, even if the 8941 // copy/move constructor and/or destructor for the object have 8942 // side effects. [...] 8943 // - when a temporary class object that has not been bound to a 8944 // reference (12.2) would be copied/moved to a class object 8945 // with the same cv-unqualified type, the copy/move operation 8946 // can be omitted by constructing the temporary object 8947 // directly into the target of the omitted copy/move 8948 if (ConstructKind == CXXConstructExpr::CK_Complete && 8949 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8950 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8951 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8952 } 8953 8954 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8955 Elidable, move(ExprArgs), HadMultipleCandidates, 8956 RequiresZeroInit, ConstructKind, ParenRange); 8957} 8958 8959/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8960/// including handling of its default argument expressions. 8961ExprResult 8962Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8963 CXXConstructorDecl *Constructor, bool Elidable, 8964 MultiExprArg ExprArgs, 8965 bool HadMultipleCandidates, 8966 bool RequiresZeroInit, 8967 unsigned ConstructKind, 8968 SourceRange ParenRange) { 8969 unsigned NumExprs = ExprArgs.size(); 8970 Expr **Exprs = (Expr **)ExprArgs.release(); 8971 8972 for (specific_attr_iterator<NonNullAttr> 8973 i = Constructor->specific_attr_begin<NonNullAttr>(), 8974 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8975 const NonNullAttr *NonNull = *i; 8976 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8977 } 8978 8979 MarkDeclarationReferenced(ConstructLoc, Constructor); 8980 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8981 Constructor, Elidable, Exprs, NumExprs, 8982 HadMultipleCandidates, RequiresZeroInit, 8983 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8984 ParenRange)); 8985} 8986 8987bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8988 CXXConstructorDecl *Constructor, 8989 MultiExprArg Exprs, 8990 bool HadMultipleCandidates) { 8991 // FIXME: Provide the correct paren SourceRange when available. 8992 ExprResult TempResult = 8993 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8994 move(Exprs), HadMultipleCandidates, false, 8995 CXXConstructExpr::CK_Complete, SourceRange()); 8996 if (TempResult.isInvalid()) 8997 return true; 8998 8999 Expr *Temp = TempResult.takeAs<Expr>(); 9000 CheckImplicitConversions(Temp, VD->getLocation()); 9001 MarkDeclarationReferenced(VD->getLocation(), Constructor); 9002 Temp = MaybeCreateExprWithCleanups(Temp); 9003 VD->setInit(Temp); 9004 9005 return false; 9006} 9007 9008void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9009 if (VD->isInvalidDecl()) return; 9010 9011 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9012 if (ClassDecl->isInvalidDecl()) return; 9013 if (ClassDecl->hasTrivialDestructor()) return; 9014 if (ClassDecl->isDependentContext()) return; 9015 9016 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9017 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9018 CheckDestructorAccess(VD->getLocation(), Destructor, 9019 PDiag(diag::err_access_dtor_var) 9020 << VD->getDeclName() 9021 << VD->getType()); 9022 9023 if (!VD->hasGlobalStorage()) return; 9024 9025 // Emit warning for non-trivial dtor in global scope (a real global, 9026 // class-static, function-static). 9027 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9028 9029 // TODO: this should be re-enabled for static locals by !CXAAtExit 9030 if (!VD->isStaticLocal()) 9031 Diag(VD->getLocation(), diag::warn_global_destructor); 9032} 9033 9034/// AddCXXDirectInitializerToDecl - This action is called immediately after 9035/// ActOnDeclarator, when a C++ direct initializer is present. 9036/// e.g: "int x(1);" 9037void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9038 SourceLocation LParenLoc, 9039 MultiExprArg Exprs, 9040 SourceLocation RParenLoc, 9041 bool TypeMayContainAuto) { 9042 // If there is no declaration, there was an error parsing it. Just ignore 9043 // the initializer. 9044 if (RealDecl == 0) 9045 return; 9046 9047 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9048 if (!VDecl) { 9049 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9050 RealDecl->setInvalidDecl(); 9051 return; 9052 } 9053 9054 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9055 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9056 if (Exprs.size() == 0) { 9057 // It isn't possible to write this directly, but it is possible to 9058 // end up in this situation with "auto x(some_pack...);" 9059 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 9060 << VDecl->getDeclName() << VDecl->getType() 9061 << VDecl->getSourceRange(); 9062 RealDecl->setInvalidDecl(); 9063 return; 9064 } 9065 9066 if (Exprs.size() > 1) { 9067 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9068 diag::err_auto_var_init_multiple_expressions) 9069 << VDecl->getDeclName() << VDecl->getType() 9070 << VDecl->getSourceRange(); 9071 RealDecl->setInvalidDecl(); 9072 return; 9073 } 9074 9075 Expr *Init = Exprs.get()[0]; 9076 TypeSourceInfo *DeducedType = 0; 9077 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 9078 DiagnoseAutoDeductionFailure(VDecl, Init); 9079 if (!DeducedType) { 9080 RealDecl->setInvalidDecl(); 9081 return; 9082 } 9083 VDecl->setTypeSourceInfo(DeducedType); 9084 VDecl->setType(DeducedType->getType()); 9085 9086 // In ARC, infer lifetime. 9087 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9088 VDecl->setInvalidDecl(); 9089 9090 // If this is a redeclaration, check that the type we just deduced matches 9091 // the previously declared type. 9092 if (VarDecl *Old = VDecl->getPreviousDecl()) 9093 MergeVarDeclTypes(VDecl, Old); 9094 } 9095 9096 // We will represent direct-initialization similarly to copy-initialization: 9097 // int x(1); -as-> int x = 1; 9098 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9099 // 9100 // Clients that want to distinguish between the two forms, can check for 9101 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9102 // A major benefit is that clients that don't particularly care about which 9103 // exactly form was it (like the CodeGen) can handle both cases without 9104 // special case code. 9105 9106 // C++ 8.5p11: 9107 // The form of initialization (using parentheses or '=') is generally 9108 // insignificant, but does matter when the entity being initialized has a 9109 // class type. 9110 9111 if (!VDecl->getType()->isDependentType() && 9112 !VDecl->getType()->isIncompleteArrayType() && 9113 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9114 diag::err_typecheck_decl_incomplete_type)) { 9115 VDecl->setInvalidDecl(); 9116 return; 9117 } 9118 9119 // The variable can not have an abstract class type. 9120 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9121 diag::err_abstract_type_in_decl, 9122 AbstractVariableType)) 9123 VDecl->setInvalidDecl(); 9124 9125 const VarDecl *Def; 9126 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9127 Diag(VDecl->getLocation(), diag::err_redefinition) 9128 << VDecl->getDeclName(); 9129 Diag(Def->getLocation(), diag::note_previous_definition); 9130 VDecl->setInvalidDecl(); 9131 return; 9132 } 9133 9134 // C++ [class.static.data]p4 9135 // If a static data member is of const integral or const 9136 // enumeration type, its declaration in the class definition can 9137 // specify a constant-initializer which shall be an integral 9138 // constant expression (5.19). In that case, the member can appear 9139 // in integral constant expressions. The member shall still be 9140 // defined in a namespace scope if it is used in the program and the 9141 // namespace scope definition shall not contain an initializer. 9142 // 9143 // We already performed a redefinition check above, but for static 9144 // data members we also need to check whether there was an in-class 9145 // declaration with an initializer. 9146 const VarDecl* PrevInit = 0; 9147 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9148 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9149 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9150 return; 9151 } 9152 9153 bool IsDependent = false; 9154 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9155 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9156 VDecl->setInvalidDecl(); 9157 return; 9158 } 9159 9160 if (Exprs.get()[I]->isTypeDependent()) 9161 IsDependent = true; 9162 } 9163 9164 // If either the declaration has a dependent type or if any of the 9165 // expressions is type-dependent, we represent the initialization 9166 // via a ParenListExpr for later use during template instantiation. 9167 if (VDecl->getType()->isDependentType() || IsDependent) { 9168 // Let clients know that initialization was done with a direct initializer. 9169 VDecl->setCXXDirectInitializer(true); 9170 9171 // Store the initialization expressions as a ParenListExpr. 9172 unsigned NumExprs = Exprs.size(); 9173 VDecl->setInit(new (Context) ParenListExpr( 9174 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9175 VDecl->getType().getNonReferenceType())); 9176 return; 9177 } 9178 9179 // Capture the variable that is being initialized and the style of 9180 // initialization. 9181 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9182 9183 // FIXME: Poor source location information. 9184 InitializationKind Kind 9185 = InitializationKind::CreateDirect(VDecl->getLocation(), 9186 LParenLoc, RParenLoc); 9187 9188 QualType T = VDecl->getType(); 9189 InitializationSequence InitSeq(*this, Entity, Kind, 9190 Exprs.get(), Exprs.size()); 9191 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9192 if (Result.isInvalid()) { 9193 VDecl->setInvalidDecl(); 9194 return; 9195 } else if (T != VDecl->getType()) { 9196 VDecl->setType(T); 9197 Result.get()->setType(T); 9198 } 9199 9200 9201 Expr *Init = Result.get(); 9202 CheckImplicitConversions(Init, LParenLoc); 9203 9204 Init = MaybeCreateExprWithCleanups(Init); 9205 VDecl->setInit(Init); 9206 VDecl->setCXXDirectInitializer(true); 9207 9208 CheckCompleteVariableDeclaration(VDecl); 9209} 9210 9211/// \brief Given a constructor and the set of arguments provided for the 9212/// constructor, convert the arguments and add any required default arguments 9213/// to form a proper call to this constructor. 9214/// 9215/// \returns true if an error occurred, false otherwise. 9216bool 9217Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9218 MultiExprArg ArgsPtr, 9219 SourceLocation Loc, 9220 ASTOwningVector<Expr*> &ConvertedArgs) { 9221 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9222 unsigned NumArgs = ArgsPtr.size(); 9223 Expr **Args = (Expr **)ArgsPtr.get(); 9224 9225 const FunctionProtoType *Proto 9226 = Constructor->getType()->getAs<FunctionProtoType>(); 9227 assert(Proto && "Constructor without a prototype?"); 9228 unsigned NumArgsInProto = Proto->getNumArgs(); 9229 9230 // If too few arguments are available, we'll fill in the rest with defaults. 9231 if (NumArgs < NumArgsInProto) 9232 ConvertedArgs.reserve(NumArgsInProto); 9233 else 9234 ConvertedArgs.reserve(NumArgs); 9235 9236 VariadicCallType CallType = 9237 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9238 SmallVector<Expr *, 8> AllArgs; 9239 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9240 Proto, 0, Args, NumArgs, AllArgs, 9241 CallType); 9242 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9243 ConvertedArgs.push_back(AllArgs[i]); 9244 return Invalid; 9245} 9246 9247static inline bool 9248CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9249 const FunctionDecl *FnDecl) { 9250 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9251 if (isa<NamespaceDecl>(DC)) { 9252 return SemaRef.Diag(FnDecl->getLocation(), 9253 diag::err_operator_new_delete_declared_in_namespace) 9254 << FnDecl->getDeclName(); 9255 } 9256 9257 if (isa<TranslationUnitDecl>(DC) && 9258 FnDecl->getStorageClass() == SC_Static) { 9259 return SemaRef.Diag(FnDecl->getLocation(), 9260 diag::err_operator_new_delete_declared_static) 9261 << FnDecl->getDeclName(); 9262 } 9263 9264 return false; 9265} 9266 9267static inline bool 9268CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9269 CanQualType ExpectedResultType, 9270 CanQualType ExpectedFirstParamType, 9271 unsigned DependentParamTypeDiag, 9272 unsigned InvalidParamTypeDiag) { 9273 QualType ResultType = 9274 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9275 9276 // Check that the result type is not dependent. 9277 if (ResultType->isDependentType()) 9278 return SemaRef.Diag(FnDecl->getLocation(), 9279 diag::err_operator_new_delete_dependent_result_type) 9280 << FnDecl->getDeclName() << ExpectedResultType; 9281 9282 // Check that the result type is what we expect. 9283 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9284 return SemaRef.Diag(FnDecl->getLocation(), 9285 diag::err_operator_new_delete_invalid_result_type) 9286 << FnDecl->getDeclName() << ExpectedResultType; 9287 9288 // A function template must have at least 2 parameters. 9289 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9290 return SemaRef.Diag(FnDecl->getLocation(), 9291 diag::err_operator_new_delete_template_too_few_parameters) 9292 << FnDecl->getDeclName(); 9293 9294 // The function decl must have at least 1 parameter. 9295 if (FnDecl->getNumParams() == 0) 9296 return SemaRef.Diag(FnDecl->getLocation(), 9297 diag::err_operator_new_delete_too_few_parameters) 9298 << FnDecl->getDeclName(); 9299 9300 // Check the the first parameter type is not dependent. 9301 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9302 if (FirstParamType->isDependentType()) 9303 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9304 << FnDecl->getDeclName() << ExpectedFirstParamType; 9305 9306 // Check that the first parameter type is what we expect. 9307 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9308 ExpectedFirstParamType) 9309 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9310 << FnDecl->getDeclName() << ExpectedFirstParamType; 9311 9312 return false; 9313} 9314 9315static bool 9316CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9317 // C++ [basic.stc.dynamic.allocation]p1: 9318 // A program is ill-formed if an allocation function is declared in a 9319 // namespace scope other than global scope or declared static in global 9320 // scope. 9321 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9322 return true; 9323 9324 CanQualType SizeTy = 9325 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9326 9327 // C++ [basic.stc.dynamic.allocation]p1: 9328 // The return type shall be void*. The first parameter shall have type 9329 // std::size_t. 9330 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9331 SizeTy, 9332 diag::err_operator_new_dependent_param_type, 9333 diag::err_operator_new_param_type)) 9334 return true; 9335 9336 // C++ [basic.stc.dynamic.allocation]p1: 9337 // The first parameter shall not have an associated default argument. 9338 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9339 return SemaRef.Diag(FnDecl->getLocation(), 9340 diag::err_operator_new_default_arg) 9341 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9342 9343 return false; 9344} 9345 9346static bool 9347CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9348 // C++ [basic.stc.dynamic.deallocation]p1: 9349 // A program is ill-formed if deallocation functions are declared in a 9350 // namespace scope other than global scope or declared static in global 9351 // scope. 9352 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9353 return true; 9354 9355 // C++ [basic.stc.dynamic.deallocation]p2: 9356 // Each deallocation function shall return void and its first parameter 9357 // shall be void*. 9358 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9359 SemaRef.Context.VoidPtrTy, 9360 diag::err_operator_delete_dependent_param_type, 9361 diag::err_operator_delete_param_type)) 9362 return true; 9363 9364 return false; 9365} 9366 9367/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9368/// of this overloaded operator is well-formed. If so, returns false; 9369/// otherwise, emits appropriate diagnostics and returns true. 9370bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9371 assert(FnDecl && FnDecl->isOverloadedOperator() && 9372 "Expected an overloaded operator declaration"); 9373 9374 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9375 9376 // C++ [over.oper]p5: 9377 // The allocation and deallocation functions, operator new, 9378 // operator new[], operator delete and operator delete[], are 9379 // described completely in 3.7.3. The attributes and restrictions 9380 // found in the rest of this subclause do not apply to them unless 9381 // explicitly stated in 3.7.3. 9382 if (Op == OO_Delete || Op == OO_Array_Delete) 9383 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9384 9385 if (Op == OO_New || Op == OO_Array_New) 9386 return CheckOperatorNewDeclaration(*this, FnDecl); 9387 9388 // C++ [over.oper]p6: 9389 // An operator function shall either be a non-static member 9390 // function or be a non-member function and have at least one 9391 // parameter whose type is a class, a reference to a class, an 9392 // enumeration, or a reference to an enumeration. 9393 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9394 if (MethodDecl->isStatic()) 9395 return Diag(FnDecl->getLocation(), 9396 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9397 } else { 9398 bool ClassOrEnumParam = false; 9399 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9400 ParamEnd = FnDecl->param_end(); 9401 Param != ParamEnd; ++Param) { 9402 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9403 if (ParamType->isDependentType() || ParamType->isRecordType() || 9404 ParamType->isEnumeralType()) { 9405 ClassOrEnumParam = true; 9406 break; 9407 } 9408 } 9409 9410 if (!ClassOrEnumParam) 9411 return Diag(FnDecl->getLocation(), 9412 diag::err_operator_overload_needs_class_or_enum) 9413 << FnDecl->getDeclName(); 9414 } 9415 9416 // C++ [over.oper]p8: 9417 // An operator function cannot have default arguments (8.3.6), 9418 // except where explicitly stated below. 9419 // 9420 // Only the function-call operator allows default arguments 9421 // (C++ [over.call]p1). 9422 if (Op != OO_Call) { 9423 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9424 Param != FnDecl->param_end(); ++Param) { 9425 if ((*Param)->hasDefaultArg()) 9426 return Diag((*Param)->getLocation(), 9427 diag::err_operator_overload_default_arg) 9428 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9429 } 9430 } 9431 9432 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9433 { false, false, false } 9434#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9435 , { Unary, Binary, MemberOnly } 9436#include "clang/Basic/OperatorKinds.def" 9437 }; 9438 9439 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9440 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9441 bool MustBeMemberOperator = OperatorUses[Op][2]; 9442 9443 // C++ [over.oper]p8: 9444 // [...] Operator functions cannot have more or fewer parameters 9445 // than the number required for the corresponding operator, as 9446 // described in the rest of this subclause. 9447 unsigned NumParams = FnDecl->getNumParams() 9448 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9449 if (Op != OO_Call && 9450 ((NumParams == 1 && !CanBeUnaryOperator) || 9451 (NumParams == 2 && !CanBeBinaryOperator) || 9452 (NumParams < 1) || (NumParams > 2))) { 9453 // We have the wrong number of parameters. 9454 unsigned ErrorKind; 9455 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9456 ErrorKind = 2; // 2 -> unary or binary. 9457 } else if (CanBeUnaryOperator) { 9458 ErrorKind = 0; // 0 -> unary 9459 } else { 9460 assert(CanBeBinaryOperator && 9461 "All non-call overloaded operators are unary or binary!"); 9462 ErrorKind = 1; // 1 -> binary 9463 } 9464 9465 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9466 << FnDecl->getDeclName() << NumParams << ErrorKind; 9467 } 9468 9469 // Overloaded operators other than operator() cannot be variadic. 9470 if (Op != OO_Call && 9471 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9472 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9473 << FnDecl->getDeclName(); 9474 } 9475 9476 // Some operators must be non-static member functions. 9477 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9478 return Diag(FnDecl->getLocation(), 9479 diag::err_operator_overload_must_be_member) 9480 << FnDecl->getDeclName(); 9481 } 9482 9483 // C++ [over.inc]p1: 9484 // The user-defined function called operator++ implements the 9485 // prefix and postfix ++ operator. If this function is a member 9486 // function with no parameters, or a non-member function with one 9487 // parameter of class or enumeration type, it defines the prefix 9488 // increment operator ++ for objects of that type. If the function 9489 // is a member function with one parameter (which shall be of type 9490 // int) or a non-member function with two parameters (the second 9491 // of which shall be of type int), it defines the postfix 9492 // increment operator ++ for objects of that type. 9493 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9494 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9495 bool ParamIsInt = false; 9496 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9497 ParamIsInt = BT->getKind() == BuiltinType::Int; 9498 9499 if (!ParamIsInt) 9500 return Diag(LastParam->getLocation(), 9501 diag::err_operator_overload_post_incdec_must_be_int) 9502 << LastParam->getType() << (Op == OO_MinusMinus); 9503 } 9504 9505 return false; 9506} 9507 9508/// CheckLiteralOperatorDeclaration - Check whether the declaration 9509/// of this literal operator function is well-formed. If so, returns 9510/// false; otherwise, emits appropriate diagnostics and returns true. 9511bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9512 DeclContext *DC = FnDecl->getDeclContext(); 9513 Decl::Kind Kind = DC->getDeclKind(); 9514 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9515 Kind != Decl::LinkageSpec) { 9516 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9517 << FnDecl->getDeclName(); 9518 return true; 9519 } 9520 9521 bool Valid = false; 9522 9523 // template <char...> type operator "" name() is the only valid template 9524 // signature, and the only valid signature with no parameters. 9525 if (FnDecl->param_size() == 0) { 9526 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9527 // Must have only one template parameter 9528 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9529 if (Params->size() == 1) { 9530 NonTypeTemplateParmDecl *PmDecl = 9531 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9532 9533 // The template parameter must be a char parameter pack. 9534 if (PmDecl && PmDecl->isTemplateParameterPack() && 9535 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9536 Valid = true; 9537 } 9538 } 9539 } else { 9540 // Check the first parameter 9541 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9542 9543 QualType T = (*Param)->getType(); 9544 9545 // unsigned long long int, long double, and any character type are allowed 9546 // as the only parameters. 9547 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9548 Context.hasSameType(T, Context.LongDoubleTy) || 9549 Context.hasSameType(T, Context.CharTy) || 9550 Context.hasSameType(T, Context.WCharTy) || 9551 Context.hasSameType(T, Context.Char16Ty) || 9552 Context.hasSameType(T, Context.Char32Ty)) { 9553 if (++Param == FnDecl->param_end()) 9554 Valid = true; 9555 goto FinishedParams; 9556 } 9557 9558 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9559 const PointerType *PT = T->getAs<PointerType>(); 9560 if (!PT) 9561 goto FinishedParams; 9562 T = PT->getPointeeType(); 9563 if (!T.isConstQualified()) 9564 goto FinishedParams; 9565 T = T.getUnqualifiedType(); 9566 9567 // Move on to the second parameter; 9568 ++Param; 9569 9570 // If there is no second parameter, the first must be a const char * 9571 if (Param == FnDecl->param_end()) { 9572 if (Context.hasSameType(T, Context.CharTy)) 9573 Valid = true; 9574 goto FinishedParams; 9575 } 9576 9577 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9578 // are allowed as the first parameter to a two-parameter function 9579 if (!(Context.hasSameType(T, Context.CharTy) || 9580 Context.hasSameType(T, Context.WCharTy) || 9581 Context.hasSameType(T, Context.Char16Ty) || 9582 Context.hasSameType(T, Context.Char32Ty))) 9583 goto FinishedParams; 9584 9585 // The second and final parameter must be an std::size_t 9586 T = (*Param)->getType().getUnqualifiedType(); 9587 if (Context.hasSameType(T, Context.getSizeType()) && 9588 ++Param == FnDecl->param_end()) 9589 Valid = true; 9590 } 9591 9592 // FIXME: This diagnostic is absolutely terrible. 9593FinishedParams: 9594 if (!Valid) { 9595 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9596 << FnDecl->getDeclName(); 9597 return true; 9598 } 9599 9600 StringRef LiteralName 9601 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9602 if (LiteralName[0] != '_') { 9603 // C++0x [usrlit.suffix]p1: 9604 // Literal suffix identifiers that do not start with an underscore are 9605 // reserved for future standardization. 9606 bool IsHexFloat = true; 9607 if (LiteralName.size() > 1 && 9608 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9609 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9610 if (!isdigit(LiteralName[I])) { 9611 IsHexFloat = false; 9612 break; 9613 } 9614 } 9615 } 9616 9617 if (IsHexFloat) 9618 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9619 << LiteralName; 9620 else 9621 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9622 } 9623 9624 return false; 9625} 9626 9627/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9628/// linkage specification, including the language and (if present) 9629/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9630/// the location of the language string literal, which is provided 9631/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9632/// the '{' brace. Otherwise, this linkage specification does not 9633/// have any braces. 9634Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9635 SourceLocation LangLoc, 9636 StringRef Lang, 9637 SourceLocation LBraceLoc) { 9638 LinkageSpecDecl::LanguageIDs Language; 9639 if (Lang == "\"C\"") 9640 Language = LinkageSpecDecl::lang_c; 9641 else if (Lang == "\"C++\"") 9642 Language = LinkageSpecDecl::lang_cxx; 9643 else { 9644 Diag(LangLoc, diag::err_bad_language); 9645 return 0; 9646 } 9647 9648 // FIXME: Add all the various semantics of linkage specifications 9649 9650 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9651 ExternLoc, LangLoc, Language); 9652 CurContext->addDecl(D); 9653 PushDeclContext(S, D); 9654 return D; 9655} 9656 9657/// ActOnFinishLinkageSpecification - Complete the definition of 9658/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9659/// valid, it's the position of the closing '}' brace in a linkage 9660/// specification that uses braces. 9661Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9662 Decl *LinkageSpec, 9663 SourceLocation RBraceLoc) { 9664 if (LinkageSpec) { 9665 if (RBraceLoc.isValid()) { 9666 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9667 LSDecl->setRBraceLoc(RBraceLoc); 9668 } 9669 PopDeclContext(); 9670 } 9671 return LinkageSpec; 9672} 9673 9674/// \brief Perform semantic analysis for the variable declaration that 9675/// occurs within a C++ catch clause, returning the newly-created 9676/// variable. 9677VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9678 TypeSourceInfo *TInfo, 9679 SourceLocation StartLoc, 9680 SourceLocation Loc, 9681 IdentifierInfo *Name) { 9682 bool Invalid = false; 9683 QualType ExDeclType = TInfo->getType(); 9684 9685 // Arrays and functions decay. 9686 if (ExDeclType->isArrayType()) 9687 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9688 else if (ExDeclType->isFunctionType()) 9689 ExDeclType = Context.getPointerType(ExDeclType); 9690 9691 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9692 // The exception-declaration shall not denote a pointer or reference to an 9693 // incomplete type, other than [cv] void*. 9694 // N2844 forbids rvalue references. 9695 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9696 Diag(Loc, diag::err_catch_rvalue_ref); 9697 Invalid = true; 9698 } 9699 9700 // GCC allows catching pointers and references to incomplete types 9701 // as an extension; so do we, but we warn by default. 9702 9703 QualType BaseType = ExDeclType; 9704 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9705 unsigned DK = diag::err_catch_incomplete; 9706 bool IncompleteCatchIsInvalid = true; 9707 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9708 BaseType = Ptr->getPointeeType(); 9709 Mode = 1; 9710 DK = diag::ext_catch_incomplete_ptr; 9711 IncompleteCatchIsInvalid = false; 9712 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9713 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9714 BaseType = Ref->getPointeeType(); 9715 Mode = 2; 9716 DK = diag::ext_catch_incomplete_ref; 9717 IncompleteCatchIsInvalid = false; 9718 } 9719 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9720 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9721 IncompleteCatchIsInvalid) 9722 Invalid = true; 9723 9724 if (!Invalid && !ExDeclType->isDependentType() && 9725 RequireNonAbstractType(Loc, ExDeclType, 9726 diag::err_abstract_type_in_decl, 9727 AbstractVariableType)) 9728 Invalid = true; 9729 9730 // Only the non-fragile NeXT runtime currently supports C++ catches 9731 // of ObjC types, and no runtime supports catching ObjC types by value. 9732 if (!Invalid && getLangOptions().ObjC1) { 9733 QualType T = ExDeclType; 9734 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9735 T = RT->getPointeeType(); 9736 9737 if (T->isObjCObjectType()) { 9738 Diag(Loc, diag::err_objc_object_catch); 9739 Invalid = true; 9740 } else if (T->isObjCObjectPointerType()) { 9741 if (!getLangOptions().ObjCNonFragileABI) 9742 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9743 } 9744 } 9745 9746 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9747 ExDeclType, TInfo, SC_None, SC_None); 9748 ExDecl->setExceptionVariable(true); 9749 9750 // In ARC, infer 'retaining' for variables of retainable type. 9751 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9752 Invalid = true; 9753 9754 if (!Invalid && !ExDeclType->isDependentType()) { 9755 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9756 // C++ [except.handle]p16: 9757 // The object declared in an exception-declaration or, if the 9758 // exception-declaration does not specify a name, a temporary (12.2) is 9759 // copy-initialized (8.5) from the exception object. [...] 9760 // The object is destroyed when the handler exits, after the destruction 9761 // of any automatic objects initialized within the handler. 9762 // 9763 // We just pretend to initialize the object with itself, then make sure 9764 // it can be destroyed later. 9765 QualType initType = ExDeclType; 9766 9767 InitializedEntity entity = 9768 InitializedEntity::InitializeVariable(ExDecl); 9769 InitializationKind initKind = 9770 InitializationKind::CreateCopy(Loc, SourceLocation()); 9771 9772 Expr *opaqueValue = 9773 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9774 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9775 ExprResult result = sequence.Perform(*this, entity, initKind, 9776 MultiExprArg(&opaqueValue, 1)); 9777 if (result.isInvalid()) 9778 Invalid = true; 9779 else { 9780 // If the constructor used was non-trivial, set this as the 9781 // "initializer". 9782 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9783 if (!construct->getConstructor()->isTrivial()) { 9784 Expr *init = MaybeCreateExprWithCleanups(construct); 9785 ExDecl->setInit(init); 9786 } 9787 9788 // And make sure it's destructable. 9789 FinalizeVarWithDestructor(ExDecl, recordType); 9790 } 9791 } 9792 } 9793 9794 if (Invalid) 9795 ExDecl->setInvalidDecl(); 9796 9797 return ExDecl; 9798} 9799 9800/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9801/// handler. 9802Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9803 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9804 bool Invalid = D.isInvalidType(); 9805 9806 // Check for unexpanded parameter packs. 9807 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9808 UPPC_ExceptionType)) { 9809 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9810 D.getIdentifierLoc()); 9811 Invalid = true; 9812 } 9813 9814 IdentifierInfo *II = D.getIdentifier(); 9815 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9816 LookupOrdinaryName, 9817 ForRedeclaration)) { 9818 // The scope should be freshly made just for us. There is just no way 9819 // it contains any previous declaration. 9820 assert(!S->isDeclScope(PrevDecl)); 9821 if (PrevDecl->isTemplateParameter()) { 9822 // Maybe we will complain about the shadowed template parameter. 9823 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9824 PrevDecl = 0; 9825 } 9826 } 9827 9828 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9829 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9830 << D.getCXXScopeSpec().getRange(); 9831 Invalid = true; 9832 } 9833 9834 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9835 D.getSourceRange().getBegin(), 9836 D.getIdentifierLoc(), 9837 D.getIdentifier()); 9838 if (Invalid) 9839 ExDecl->setInvalidDecl(); 9840 9841 // Add the exception declaration into this scope. 9842 if (II) 9843 PushOnScopeChains(ExDecl, S); 9844 else 9845 CurContext->addDecl(ExDecl); 9846 9847 ProcessDeclAttributes(S, ExDecl, D); 9848 return ExDecl; 9849} 9850 9851Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9852 Expr *AssertExpr, 9853 Expr *AssertMessageExpr_, 9854 SourceLocation RParenLoc) { 9855 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9856 9857 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9858 llvm::APSInt Cond; 9859 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9860 diag::err_static_assert_expression_is_not_constant, 9861 /*AllowFold=*/false)) 9862 return 0; 9863 9864 if (!Cond) 9865 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9866 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9867 } 9868 9869 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9870 return 0; 9871 9872 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9873 AssertExpr, AssertMessage, RParenLoc); 9874 9875 CurContext->addDecl(Decl); 9876 return Decl; 9877} 9878 9879/// \brief Perform semantic analysis of the given friend type declaration. 9880/// 9881/// \returns A friend declaration that. 9882FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9883 SourceLocation FriendLoc, 9884 TypeSourceInfo *TSInfo) { 9885 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9886 9887 QualType T = TSInfo->getType(); 9888 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9889 9890 // C++03 [class.friend]p2: 9891 // An elaborated-type-specifier shall be used in a friend declaration 9892 // for a class.* 9893 // 9894 // * The class-key of the elaborated-type-specifier is required. 9895 if (!ActiveTemplateInstantiations.empty()) { 9896 // Do not complain about the form of friend template types during 9897 // template instantiation; we will already have complained when the 9898 // template was declared. 9899 } else if (!T->isElaboratedTypeSpecifier()) { 9900 // If we evaluated the type to a record type, suggest putting 9901 // a tag in front. 9902 if (const RecordType *RT = T->getAs<RecordType>()) { 9903 RecordDecl *RD = RT->getDecl(); 9904 9905 std::string InsertionText = std::string(" ") + RD->getKindName(); 9906 9907 Diag(TypeRange.getBegin(), 9908 getLangOptions().CPlusPlus0x ? 9909 diag::warn_cxx98_compat_unelaborated_friend_type : 9910 diag::ext_unelaborated_friend_type) 9911 << (unsigned) RD->getTagKind() 9912 << T 9913 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9914 InsertionText); 9915 } else { 9916 Diag(FriendLoc, 9917 getLangOptions().CPlusPlus0x ? 9918 diag::warn_cxx98_compat_nonclass_type_friend : 9919 diag::ext_nonclass_type_friend) 9920 << T 9921 << SourceRange(FriendLoc, TypeRange.getEnd()); 9922 } 9923 } else if (T->getAs<EnumType>()) { 9924 Diag(FriendLoc, 9925 getLangOptions().CPlusPlus0x ? 9926 diag::warn_cxx98_compat_enum_friend : 9927 diag::ext_enum_friend) 9928 << T 9929 << SourceRange(FriendLoc, TypeRange.getEnd()); 9930 } 9931 9932 // C++0x [class.friend]p3: 9933 // If the type specifier in a friend declaration designates a (possibly 9934 // cv-qualified) class type, that class is declared as a friend; otherwise, 9935 // the friend declaration is ignored. 9936 9937 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9938 // in [class.friend]p3 that we do not implement. 9939 9940 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9941} 9942 9943/// Handle a friend tag declaration where the scope specifier was 9944/// templated. 9945Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9946 unsigned TagSpec, SourceLocation TagLoc, 9947 CXXScopeSpec &SS, 9948 IdentifierInfo *Name, SourceLocation NameLoc, 9949 AttributeList *Attr, 9950 MultiTemplateParamsArg TempParamLists) { 9951 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9952 9953 bool isExplicitSpecialization = false; 9954 bool Invalid = false; 9955 9956 if (TemplateParameterList *TemplateParams 9957 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9958 TempParamLists.get(), 9959 TempParamLists.size(), 9960 /*friend*/ true, 9961 isExplicitSpecialization, 9962 Invalid)) { 9963 if (TemplateParams->size() > 0) { 9964 // This is a declaration of a class template. 9965 if (Invalid) 9966 return 0; 9967 9968 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9969 SS, Name, NameLoc, Attr, 9970 TemplateParams, AS_public, 9971 /*ModulePrivateLoc=*/SourceLocation(), 9972 TempParamLists.size() - 1, 9973 (TemplateParameterList**) TempParamLists.release()).take(); 9974 } else { 9975 // The "template<>" header is extraneous. 9976 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9977 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9978 isExplicitSpecialization = true; 9979 } 9980 } 9981 9982 if (Invalid) return 0; 9983 9984 bool isAllExplicitSpecializations = true; 9985 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9986 if (TempParamLists.get()[I]->size()) { 9987 isAllExplicitSpecializations = false; 9988 break; 9989 } 9990 } 9991 9992 // FIXME: don't ignore attributes. 9993 9994 // If it's explicit specializations all the way down, just forget 9995 // about the template header and build an appropriate non-templated 9996 // friend. TODO: for source fidelity, remember the headers. 9997 if (isAllExplicitSpecializations) { 9998 if (SS.isEmpty()) { 9999 bool Owned = false; 10000 bool IsDependent = false; 10001 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10002 Attr, AS_public, 10003 /*ModulePrivateLoc=*/SourceLocation(), 10004 MultiTemplateParamsArg(), Owned, IsDependent, 10005 /*ScopedEnumKWLoc=*/SourceLocation(), 10006 /*ScopedEnumUsesClassTag=*/false, 10007 /*UnderlyingType=*/TypeResult()); 10008 } 10009 10010 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10011 ElaboratedTypeKeyword Keyword 10012 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10013 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10014 *Name, NameLoc); 10015 if (T.isNull()) 10016 return 0; 10017 10018 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10019 if (isa<DependentNameType>(T)) { 10020 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10021 TL.setKeywordLoc(TagLoc); 10022 TL.setQualifierLoc(QualifierLoc); 10023 TL.setNameLoc(NameLoc); 10024 } else { 10025 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10026 TL.setKeywordLoc(TagLoc); 10027 TL.setQualifierLoc(QualifierLoc); 10028 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10029 } 10030 10031 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10032 TSI, FriendLoc); 10033 Friend->setAccess(AS_public); 10034 CurContext->addDecl(Friend); 10035 return Friend; 10036 } 10037 10038 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10039 10040 10041 10042 // Handle the case of a templated-scope friend class. e.g. 10043 // template <class T> class A<T>::B; 10044 // FIXME: we don't support these right now. 10045 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10046 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10047 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10048 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10049 TL.setKeywordLoc(TagLoc); 10050 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10051 TL.setNameLoc(NameLoc); 10052 10053 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10054 TSI, FriendLoc); 10055 Friend->setAccess(AS_public); 10056 Friend->setUnsupportedFriend(true); 10057 CurContext->addDecl(Friend); 10058 return Friend; 10059} 10060 10061 10062/// Handle a friend type declaration. This works in tandem with 10063/// ActOnTag. 10064/// 10065/// Notes on friend class templates: 10066/// 10067/// We generally treat friend class declarations as if they were 10068/// declaring a class. So, for example, the elaborated type specifier 10069/// in a friend declaration is required to obey the restrictions of a 10070/// class-head (i.e. no typedefs in the scope chain), template 10071/// parameters are required to match up with simple template-ids, &c. 10072/// However, unlike when declaring a template specialization, it's 10073/// okay to refer to a template specialization without an empty 10074/// template parameter declaration, e.g. 10075/// friend class A<T>::B<unsigned>; 10076/// We permit this as a special case; if there are any template 10077/// parameters present at all, require proper matching, i.e. 10078/// template <> template <class T> friend class A<int>::B; 10079Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10080 MultiTemplateParamsArg TempParams) { 10081 SourceLocation Loc = DS.getSourceRange().getBegin(); 10082 10083 assert(DS.isFriendSpecified()); 10084 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10085 10086 // Try to convert the decl specifier to a type. This works for 10087 // friend templates because ActOnTag never produces a ClassTemplateDecl 10088 // for a TUK_Friend. 10089 Declarator TheDeclarator(DS, Declarator::MemberContext); 10090 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10091 QualType T = TSI->getType(); 10092 if (TheDeclarator.isInvalidType()) 10093 return 0; 10094 10095 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10096 return 0; 10097 10098 // This is definitely an error in C++98. It's probably meant to 10099 // be forbidden in C++0x, too, but the specification is just 10100 // poorly written. 10101 // 10102 // The problem is with declarations like the following: 10103 // template <T> friend A<T>::foo; 10104 // where deciding whether a class C is a friend or not now hinges 10105 // on whether there exists an instantiation of A that causes 10106 // 'foo' to equal C. There are restrictions on class-heads 10107 // (which we declare (by fiat) elaborated friend declarations to 10108 // be) that makes this tractable. 10109 // 10110 // FIXME: handle "template <> friend class A<T>;", which 10111 // is possibly well-formed? Who even knows? 10112 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10113 Diag(Loc, diag::err_tagless_friend_type_template) 10114 << DS.getSourceRange(); 10115 return 0; 10116 } 10117 10118 // C++98 [class.friend]p1: A friend of a class is a function 10119 // or class that is not a member of the class . . . 10120 // This is fixed in DR77, which just barely didn't make the C++03 10121 // deadline. It's also a very silly restriction that seriously 10122 // affects inner classes and which nobody else seems to implement; 10123 // thus we never diagnose it, not even in -pedantic. 10124 // 10125 // But note that we could warn about it: it's always useless to 10126 // friend one of your own members (it's not, however, worthless to 10127 // friend a member of an arbitrary specialization of your template). 10128 10129 Decl *D; 10130 if (unsigned NumTempParamLists = TempParams.size()) 10131 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10132 NumTempParamLists, 10133 TempParams.release(), 10134 TSI, 10135 DS.getFriendSpecLoc()); 10136 else 10137 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10138 10139 if (!D) 10140 return 0; 10141 10142 D->setAccess(AS_public); 10143 CurContext->addDecl(D); 10144 10145 return D; 10146} 10147 10148Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10149 MultiTemplateParamsArg TemplateParams) { 10150 const DeclSpec &DS = D.getDeclSpec(); 10151 10152 assert(DS.isFriendSpecified()); 10153 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10154 10155 SourceLocation Loc = D.getIdentifierLoc(); 10156 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10157 10158 // C++ [class.friend]p1 10159 // A friend of a class is a function or class.... 10160 // Note that this sees through typedefs, which is intended. 10161 // It *doesn't* see through dependent types, which is correct 10162 // according to [temp.arg.type]p3: 10163 // If a declaration acquires a function type through a 10164 // type dependent on a template-parameter and this causes 10165 // a declaration that does not use the syntactic form of a 10166 // function declarator to have a function type, the program 10167 // is ill-formed. 10168 if (!TInfo->getType()->isFunctionType()) { 10169 Diag(Loc, diag::err_unexpected_friend); 10170 10171 // It might be worthwhile to try to recover by creating an 10172 // appropriate declaration. 10173 return 0; 10174 } 10175 10176 // C++ [namespace.memdef]p3 10177 // - If a friend declaration in a non-local class first declares a 10178 // class or function, the friend class or function is a member 10179 // of the innermost enclosing namespace. 10180 // - The name of the friend is not found by simple name lookup 10181 // until a matching declaration is provided in that namespace 10182 // scope (either before or after the class declaration granting 10183 // friendship). 10184 // - If a friend function is called, its name may be found by the 10185 // name lookup that considers functions from namespaces and 10186 // classes associated with the types of the function arguments. 10187 // - When looking for a prior declaration of a class or a function 10188 // declared as a friend, scopes outside the innermost enclosing 10189 // namespace scope are not considered. 10190 10191 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10192 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10193 DeclarationName Name = NameInfo.getName(); 10194 assert(Name); 10195 10196 // Check for unexpanded parameter packs. 10197 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10198 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10199 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10200 return 0; 10201 10202 // The context we found the declaration in, or in which we should 10203 // create the declaration. 10204 DeclContext *DC; 10205 Scope *DCScope = S; 10206 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10207 ForRedeclaration); 10208 10209 // FIXME: there are different rules in local classes 10210 10211 // There are four cases here. 10212 // - There's no scope specifier, in which case we just go to the 10213 // appropriate scope and look for a function or function template 10214 // there as appropriate. 10215 // Recover from invalid scope qualifiers as if they just weren't there. 10216 if (SS.isInvalid() || !SS.isSet()) { 10217 // C++0x [namespace.memdef]p3: 10218 // If the name in a friend declaration is neither qualified nor 10219 // a template-id and the declaration is a function or an 10220 // elaborated-type-specifier, the lookup to determine whether 10221 // the entity has been previously declared shall not consider 10222 // any scopes outside the innermost enclosing namespace. 10223 // C++0x [class.friend]p11: 10224 // If a friend declaration appears in a local class and the name 10225 // specified is an unqualified name, a prior declaration is 10226 // looked up without considering scopes that are outside the 10227 // innermost enclosing non-class scope. For a friend function 10228 // declaration, if there is no prior declaration, the program is 10229 // ill-formed. 10230 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10231 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10232 10233 // Find the appropriate context according to the above. 10234 DC = CurContext; 10235 while (true) { 10236 // Skip class contexts. If someone can cite chapter and verse 10237 // for this behavior, that would be nice --- it's what GCC and 10238 // EDG do, and it seems like a reasonable intent, but the spec 10239 // really only says that checks for unqualified existing 10240 // declarations should stop at the nearest enclosing namespace, 10241 // not that they should only consider the nearest enclosing 10242 // namespace. 10243 while (DC->isRecord()) 10244 DC = DC->getParent(); 10245 10246 LookupQualifiedName(Previous, DC); 10247 10248 // TODO: decide what we think about using declarations. 10249 if (isLocal || !Previous.empty()) 10250 break; 10251 10252 if (isTemplateId) { 10253 if (isa<TranslationUnitDecl>(DC)) break; 10254 } else { 10255 if (DC->isFileContext()) break; 10256 } 10257 DC = DC->getParent(); 10258 } 10259 10260 // C++ [class.friend]p1: A friend of a class is a function or 10261 // class that is not a member of the class . . . 10262 // C++11 changes this for both friend types and functions. 10263 // Most C++ 98 compilers do seem to give an error here, so 10264 // we do, too. 10265 if (!Previous.empty() && DC->Equals(CurContext)) 10266 Diag(DS.getFriendSpecLoc(), 10267 getLangOptions().CPlusPlus0x ? 10268 diag::warn_cxx98_compat_friend_is_member : 10269 diag::err_friend_is_member); 10270 10271 DCScope = getScopeForDeclContext(S, DC); 10272 10273 // C++ [class.friend]p6: 10274 // A function can be defined in a friend declaration of a class if and 10275 // only if the class is a non-local class (9.8), the function name is 10276 // unqualified, and the function has namespace scope. 10277 if (isLocal && D.isFunctionDefinition()) { 10278 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10279 } 10280 10281 // - There's a non-dependent scope specifier, in which case we 10282 // compute it and do a previous lookup there for a function 10283 // or function template. 10284 } else if (!SS.getScopeRep()->isDependent()) { 10285 DC = computeDeclContext(SS); 10286 if (!DC) return 0; 10287 10288 if (RequireCompleteDeclContext(SS, DC)) return 0; 10289 10290 LookupQualifiedName(Previous, DC); 10291 10292 // Ignore things found implicitly in the wrong scope. 10293 // TODO: better diagnostics for this case. Suggesting the right 10294 // qualified scope would be nice... 10295 LookupResult::Filter F = Previous.makeFilter(); 10296 while (F.hasNext()) { 10297 NamedDecl *D = F.next(); 10298 if (!DC->InEnclosingNamespaceSetOf( 10299 D->getDeclContext()->getRedeclContext())) 10300 F.erase(); 10301 } 10302 F.done(); 10303 10304 if (Previous.empty()) { 10305 D.setInvalidType(); 10306 Diag(Loc, diag::err_qualified_friend_not_found) 10307 << Name << TInfo->getType(); 10308 return 0; 10309 } 10310 10311 // C++ [class.friend]p1: A friend of a class is a function or 10312 // class that is not a member of the class . . . 10313 if (DC->Equals(CurContext)) 10314 Diag(DS.getFriendSpecLoc(), 10315 getLangOptions().CPlusPlus0x ? 10316 diag::warn_cxx98_compat_friend_is_member : 10317 diag::err_friend_is_member); 10318 10319 if (D.isFunctionDefinition()) { 10320 // C++ [class.friend]p6: 10321 // A function can be defined in a friend declaration of a class if and 10322 // only if the class is a non-local class (9.8), the function name is 10323 // unqualified, and the function has namespace scope. 10324 SemaDiagnosticBuilder DB 10325 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10326 10327 DB << SS.getScopeRep(); 10328 if (DC->isFileContext()) 10329 DB << FixItHint::CreateRemoval(SS.getRange()); 10330 SS.clear(); 10331 } 10332 10333 // - There's a scope specifier that does not match any template 10334 // parameter lists, in which case we use some arbitrary context, 10335 // create a method or method template, and wait for instantiation. 10336 // - There's a scope specifier that does match some template 10337 // parameter lists, which we don't handle right now. 10338 } else { 10339 if (D.isFunctionDefinition()) { 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 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10345 << SS.getScopeRep(); 10346 } 10347 10348 DC = CurContext; 10349 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10350 } 10351 10352 if (!DC->isRecord()) { 10353 // This implies that it has to be an operator or function. 10354 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10355 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10356 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10357 Diag(Loc, diag::err_introducing_special_friend) << 10358 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10359 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10360 return 0; 10361 } 10362 } 10363 10364 // FIXME: This is an egregious hack to cope with cases where the scope stack 10365 // does not contain the declaration context, i.e., in an out-of-line 10366 // definition of a class. 10367 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10368 if (!DCScope) { 10369 FakeDCScope.setEntity(DC); 10370 DCScope = &FakeDCScope; 10371 } 10372 10373 bool AddToScope = true; 10374 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10375 move(TemplateParams), AddToScope); 10376 if (!ND) return 0; 10377 10378 assert(ND->getDeclContext() == DC); 10379 assert(ND->getLexicalDeclContext() == CurContext); 10380 10381 // Add the function declaration to the appropriate lookup tables, 10382 // adjusting the redeclarations list as necessary. We don't 10383 // want to do this yet if the friending class is dependent. 10384 // 10385 // Also update the scope-based lookup if the target context's 10386 // lookup context is in lexical scope. 10387 if (!CurContext->isDependentContext()) { 10388 DC = DC->getRedeclContext(); 10389 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10390 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10391 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10392 } 10393 10394 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10395 D.getIdentifierLoc(), ND, 10396 DS.getFriendSpecLoc()); 10397 FrD->setAccess(AS_public); 10398 CurContext->addDecl(FrD); 10399 10400 if (ND->isInvalidDecl()) 10401 FrD->setInvalidDecl(); 10402 else { 10403 FunctionDecl *FD; 10404 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10405 FD = FTD->getTemplatedDecl(); 10406 else 10407 FD = cast<FunctionDecl>(ND); 10408 10409 // Mark templated-scope function declarations as unsupported. 10410 if (FD->getNumTemplateParameterLists()) 10411 FrD->setUnsupportedFriend(true); 10412 } 10413 10414 return ND; 10415} 10416 10417void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10418 AdjustDeclIfTemplate(Dcl); 10419 10420 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10421 if (!Fn) { 10422 Diag(DelLoc, diag::err_deleted_non_function); 10423 return; 10424 } 10425 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10426 Diag(DelLoc, diag::err_deleted_decl_not_first); 10427 Diag(Prev->getLocation(), diag::note_previous_declaration); 10428 // If the declaration wasn't the first, we delete the function anyway for 10429 // recovery. 10430 } 10431 Fn->setDeletedAsWritten(); 10432} 10433 10434void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10435 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10436 10437 if (MD) { 10438 if (MD->getParent()->isDependentType()) { 10439 MD->setDefaulted(); 10440 MD->setExplicitlyDefaulted(); 10441 return; 10442 } 10443 10444 CXXSpecialMember Member = getSpecialMember(MD); 10445 if (Member == CXXInvalid) { 10446 Diag(DefaultLoc, diag::err_default_special_members); 10447 return; 10448 } 10449 10450 MD->setDefaulted(); 10451 MD->setExplicitlyDefaulted(); 10452 10453 // If this definition appears within the record, do the checking when 10454 // the record is complete. 10455 const FunctionDecl *Primary = MD; 10456 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10457 // Find the uninstantiated declaration that actually had the '= default' 10458 // on it. 10459 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10460 10461 if (Primary == Primary->getCanonicalDecl()) 10462 return; 10463 10464 switch (Member) { 10465 case CXXDefaultConstructor: { 10466 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10467 CheckExplicitlyDefaultedDefaultConstructor(CD); 10468 if (!CD->isInvalidDecl()) 10469 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10470 break; 10471 } 10472 10473 case CXXCopyConstructor: { 10474 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10475 CheckExplicitlyDefaultedCopyConstructor(CD); 10476 if (!CD->isInvalidDecl()) 10477 DefineImplicitCopyConstructor(DefaultLoc, CD); 10478 break; 10479 } 10480 10481 case CXXCopyAssignment: { 10482 CheckExplicitlyDefaultedCopyAssignment(MD); 10483 if (!MD->isInvalidDecl()) 10484 DefineImplicitCopyAssignment(DefaultLoc, MD); 10485 break; 10486 } 10487 10488 case CXXDestructor: { 10489 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10490 CheckExplicitlyDefaultedDestructor(DD); 10491 if (!DD->isInvalidDecl()) 10492 DefineImplicitDestructor(DefaultLoc, DD); 10493 break; 10494 } 10495 10496 case CXXMoveConstructor: { 10497 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10498 CheckExplicitlyDefaultedMoveConstructor(CD); 10499 if (!CD->isInvalidDecl()) 10500 DefineImplicitMoveConstructor(DefaultLoc, CD); 10501 break; 10502 } 10503 10504 case CXXMoveAssignment: { 10505 CheckExplicitlyDefaultedMoveAssignment(MD); 10506 if (!MD->isInvalidDecl()) 10507 DefineImplicitMoveAssignment(DefaultLoc, MD); 10508 break; 10509 } 10510 10511 case CXXInvalid: 10512 llvm_unreachable("Invalid special member."); 10513 } 10514 } else { 10515 Diag(DefaultLoc, diag::err_default_special_members); 10516 } 10517} 10518 10519static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10520 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10521 Stmt *SubStmt = *CI; 10522 if (!SubStmt) 10523 continue; 10524 if (isa<ReturnStmt>(SubStmt)) 10525 Self.Diag(SubStmt->getSourceRange().getBegin(), 10526 diag::err_return_in_constructor_handler); 10527 if (!isa<Expr>(SubStmt)) 10528 SearchForReturnInStmt(Self, SubStmt); 10529 } 10530} 10531 10532void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10533 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10534 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10535 SearchForReturnInStmt(*this, Handler); 10536 } 10537} 10538 10539bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10540 const CXXMethodDecl *Old) { 10541 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10542 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10543 10544 if (Context.hasSameType(NewTy, OldTy) || 10545 NewTy->isDependentType() || OldTy->isDependentType()) 10546 return false; 10547 10548 // Check if the return types are covariant 10549 QualType NewClassTy, OldClassTy; 10550 10551 /// Both types must be pointers or references to classes. 10552 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10553 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10554 NewClassTy = NewPT->getPointeeType(); 10555 OldClassTy = OldPT->getPointeeType(); 10556 } 10557 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10558 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10559 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10560 NewClassTy = NewRT->getPointeeType(); 10561 OldClassTy = OldRT->getPointeeType(); 10562 } 10563 } 10564 } 10565 10566 // The return types aren't either both pointers or references to a class type. 10567 if (NewClassTy.isNull()) { 10568 Diag(New->getLocation(), 10569 diag::err_different_return_type_for_overriding_virtual_function) 10570 << New->getDeclName() << NewTy << OldTy; 10571 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10572 10573 return true; 10574 } 10575 10576 // C++ [class.virtual]p6: 10577 // If the return type of D::f differs from the return type of B::f, the 10578 // class type in the return type of D::f shall be complete at the point of 10579 // declaration of D::f or shall be the class type D. 10580 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10581 if (!RT->isBeingDefined() && 10582 RequireCompleteType(New->getLocation(), NewClassTy, 10583 PDiag(diag::err_covariant_return_incomplete) 10584 << New->getDeclName())) 10585 return true; 10586 } 10587 10588 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10589 // Check if the new class derives from the old class. 10590 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10591 Diag(New->getLocation(), 10592 diag::err_covariant_return_not_derived) 10593 << New->getDeclName() << NewTy << OldTy; 10594 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10595 return true; 10596 } 10597 10598 // Check if we the conversion from derived to base is valid. 10599 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10600 diag::err_covariant_return_inaccessible_base, 10601 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10602 // FIXME: Should this point to the return type? 10603 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10604 // FIXME: this note won't trigger for delayed access control 10605 // diagnostics, and it's impossible to get an undelayed error 10606 // here from access control during the original parse because 10607 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10608 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10609 return true; 10610 } 10611 } 10612 10613 // The qualifiers of the return types must be the same. 10614 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10615 Diag(New->getLocation(), 10616 diag::err_covariant_return_type_different_qualifications) 10617 << New->getDeclName() << NewTy << OldTy; 10618 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10619 return true; 10620 }; 10621 10622 10623 // The new class type must have the same or less qualifiers as the old type. 10624 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10625 Diag(New->getLocation(), 10626 diag::err_covariant_return_type_class_type_more_qualified) 10627 << New->getDeclName() << NewTy << OldTy; 10628 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10629 return true; 10630 }; 10631 10632 return false; 10633} 10634 10635/// \brief Mark the given method pure. 10636/// 10637/// \param Method the method to be marked pure. 10638/// 10639/// \param InitRange the source range that covers the "0" initializer. 10640bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10641 SourceLocation EndLoc = InitRange.getEnd(); 10642 if (EndLoc.isValid()) 10643 Method->setRangeEnd(EndLoc); 10644 10645 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10646 Method->setPure(); 10647 return false; 10648 } 10649 10650 if (!Method->isInvalidDecl()) 10651 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10652 << Method->getDeclName() << InitRange; 10653 return true; 10654} 10655 10656/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10657/// an initializer for the out-of-line declaration 'Dcl'. The scope 10658/// is a fresh scope pushed for just this purpose. 10659/// 10660/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10661/// static data member of class X, names should be looked up in the scope of 10662/// class X. 10663void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10664 // If there is no declaration, there was an error parsing it. 10665 if (D == 0 || D->isInvalidDecl()) return; 10666 10667 // We should only get called for declarations with scope specifiers, like: 10668 // int foo::bar; 10669 assert(D->isOutOfLine()); 10670 EnterDeclaratorContext(S, D->getDeclContext()); 10671} 10672 10673/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10674/// initializer for the out-of-line declaration 'D'. 10675void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10676 // If there is no declaration, there was an error parsing it. 10677 if (D == 0 || D->isInvalidDecl()) return; 10678 10679 assert(D->isOutOfLine()); 10680 ExitDeclaratorContext(S); 10681} 10682 10683/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10684/// C++ if/switch/while/for statement. 10685/// e.g: "if (int x = f()) {...}" 10686DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10687 // C++ 6.4p2: 10688 // The declarator shall not specify a function or an array. 10689 // The type-specifier-seq shall not contain typedef and shall not declare a 10690 // new class or enumeration. 10691 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10692 "Parser allowed 'typedef' as storage class of condition decl."); 10693 10694 Decl *Dcl = ActOnDeclarator(S, D); 10695 if (!Dcl) 10696 return true; 10697 10698 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10699 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10700 << D.getSourceRange(); 10701 return true; 10702 } 10703 10704 return Dcl; 10705} 10706 10707void Sema::LoadExternalVTableUses() { 10708 if (!ExternalSource) 10709 return; 10710 10711 SmallVector<ExternalVTableUse, 4> VTables; 10712 ExternalSource->ReadUsedVTables(VTables); 10713 SmallVector<VTableUse, 4> NewUses; 10714 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10715 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10716 = VTablesUsed.find(VTables[I].Record); 10717 // Even if a definition wasn't required before, it may be required now. 10718 if (Pos != VTablesUsed.end()) { 10719 if (!Pos->second && VTables[I].DefinitionRequired) 10720 Pos->second = true; 10721 continue; 10722 } 10723 10724 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10725 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10726 } 10727 10728 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10729} 10730 10731void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10732 bool DefinitionRequired) { 10733 // Ignore any vtable uses in unevaluated operands or for classes that do 10734 // not have a vtable. 10735 if (!Class->isDynamicClass() || Class->isDependentContext() || 10736 CurContext->isDependentContext() || 10737 ExprEvalContexts.back().Context == Unevaluated || 10738 ExprEvalContexts.back().Context == ConstantEvaluated) 10739 return; 10740 10741 // Try to insert this class into the map. 10742 LoadExternalVTableUses(); 10743 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10744 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10745 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10746 if (!Pos.second) { 10747 // If we already had an entry, check to see if we are promoting this vtable 10748 // to required a definition. If so, we need to reappend to the VTableUses 10749 // list, since we may have already processed the first entry. 10750 if (DefinitionRequired && !Pos.first->second) { 10751 Pos.first->second = true; 10752 } else { 10753 // Otherwise, we can early exit. 10754 return; 10755 } 10756 } 10757 10758 // Local classes need to have their virtual members marked 10759 // immediately. For all other classes, we mark their virtual members 10760 // at the end of the translation unit. 10761 if (Class->isLocalClass()) 10762 MarkVirtualMembersReferenced(Loc, Class); 10763 else 10764 VTableUses.push_back(std::make_pair(Class, Loc)); 10765} 10766 10767bool Sema::DefineUsedVTables() { 10768 LoadExternalVTableUses(); 10769 if (VTableUses.empty()) 10770 return false; 10771 10772 // Note: The VTableUses vector could grow as a result of marking 10773 // the members of a class as "used", so we check the size each 10774 // time through the loop and prefer indices (with are stable) to 10775 // iterators (which are not). 10776 bool DefinedAnything = false; 10777 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10778 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10779 if (!Class) 10780 continue; 10781 10782 SourceLocation Loc = VTableUses[I].second; 10783 10784 // If this class has a key function, but that key function is 10785 // defined in another translation unit, we don't need to emit the 10786 // vtable even though we're using it. 10787 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10788 if (KeyFunction && !KeyFunction->hasBody()) { 10789 switch (KeyFunction->getTemplateSpecializationKind()) { 10790 case TSK_Undeclared: 10791 case TSK_ExplicitSpecialization: 10792 case TSK_ExplicitInstantiationDeclaration: 10793 // The key function is in another translation unit. 10794 continue; 10795 10796 case TSK_ExplicitInstantiationDefinition: 10797 case TSK_ImplicitInstantiation: 10798 // We will be instantiating the key function. 10799 break; 10800 } 10801 } else if (!KeyFunction) { 10802 // If we have a class with no key function that is the subject 10803 // of an explicit instantiation declaration, suppress the 10804 // vtable; it will live with the explicit instantiation 10805 // definition. 10806 bool IsExplicitInstantiationDeclaration 10807 = Class->getTemplateSpecializationKind() 10808 == TSK_ExplicitInstantiationDeclaration; 10809 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10810 REnd = Class->redecls_end(); 10811 R != REnd; ++R) { 10812 TemplateSpecializationKind TSK 10813 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10814 if (TSK == TSK_ExplicitInstantiationDeclaration) 10815 IsExplicitInstantiationDeclaration = true; 10816 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10817 IsExplicitInstantiationDeclaration = false; 10818 break; 10819 } 10820 } 10821 10822 if (IsExplicitInstantiationDeclaration) 10823 continue; 10824 } 10825 10826 // Mark all of the virtual members of this class as referenced, so 10827 // that we can build a vtable. Then, tell the AST consumer that a 10828 // vtable for this class is required. 10829 DefinedAnything = true; 10830 MarkVirtualMembersReferenced(Loc, Class); 10831 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10832 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10833 10834 // Optionally warn if we're emitting a weak vtable. 10835 if (Class->getLinkage() == ExternalLinkage && 10836 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10837 const FunctionDecl *KeyFunctionDef = 0; 10838 if (!KeyFunction || 10839 (KeyFunction->hasBody(KeyFunctionDef) && 10840 KeyFunctionDef->isInlined())) 10841 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10842 TSK_ExplicitInstantiationDefinition 10843 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10844 << Class; 10845 } 10846 } 10847 VTableUses.clear(); 10848 10849 return DefinedAnything; 10850} 10851 10852void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10853 const CXXRecordDecl *RD) { 10854 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10855 e = RD->method_end(); i != e; ++i) { 10856 CXXMethodDecl *MD = *i; 10857 10858 // C++ [basic.def.odr]p2: 10859 // [...] A virtual member function is used if it is not pure. [...] 10860 if (MD->isVirtual() && !MD->isPure()) 10861 MarkDeclarationReferenced(Loc, MD); 10862 } 10863 10864 // Only classes that have virtual bases need a VTT. 10865 if (RD->getNumVBases() == 0) 10866 return; 10867 10868 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10869 e = RD->bases_end(); i != e; ++i) { 10870 const CXXRecordDecl *Base = 10871 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10872 if (Base->getNumVBases() == 0) 10873 continue; 10874 MarkVirtualMembersReferenced(Loc, Base); 10875 } 10876} 10877 10878/// SetIvarInitializers - This routine builds initialization ASTs for the 10879/// Objective-C implementation whose ivars need be initialized. 10880void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10881 if (!getLangOptions().CPlusPlus) 10882 return; 10883 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10884 SmallVector<ObjCIvarDecl*, 8> ivars; 10885 CollectIvarsToConstructOrDestruct(OID, ivars); 10886 if (ivars.empty()) 10887 return; 10888 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10889 for (unsigned i = 0; i < ivars.size(); i++) { 10890 FieldDecl *Field = ivars[i]; 10891 if (Field->isInvalidDecl()) 10892 continue; 10893 10894 CXXCtorInitializer *Member; 10895 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10896 InitializationKind InitKind = 10897 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10898 10899 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10900 ExprResult MemberInit = 10901 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10902 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10903 // Note, MemberInit could actually come back empty if no initialization 10904 // is required (e.g., because it would call a trivial default constructor) 10905 if (!MemberInit.get() || MemberInit.isInvalid()) 10906 continue; 10907 10908 Member = 10909 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10910 SourceLocation(), 10911 MemberInit.takeAs<Expr>(), 10912 SourceLocation()); 10913 AllToInit.push_back(Member); 10914 10915 // Be sure that the destructor is accessible and is marked as referenced. 10916 if (const RecordType *RecordTy 10917 = Context.getBaseElementType(Field->getType()) 10918 ->getAs<RecordType>()) { 10919 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10920 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10921 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10922 CheckDestructorAccess(Field->getLocation(), Destructor, 10923 PDiag(diag::err_access_dtor_ivar) 10924 << Context.getBaseElementType(Field->getType())); 10925 } 10926 } 10927 } 10928 ObjCImplementation->setIvarInitializers(Context, 10929 AllToInit.data(), AllToInit.size()); 10930 } 10931} 10932 10933static 10934void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10935 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10936 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10937 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10938 Sema &S) { 10939 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10940 CE = Current.end(); 10941 if (Ctor->isInvalidDecl()) 10942 return; 10943 10944 const FunctionDecl *FNTarget = 0; 10945 CXXConstructorDecl *Target; 10946 10947 // We ignore the result here since if we don't have a body, Target will be 10948 // null below. 10949 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10950 Target 10951= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10952 10953 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10954 // Avoid dereferencing a null pointer here. 10955 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10956 10957 if (!Current.insert(Canonical)) 10958 return; 10959 10960 // We know that beyond here, we aren't chaining into a cycle. 10961 if (!Target || !Target->isDelegatingConstructor() || 10962 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10963 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10964 Valid.insert(*CI); 10965 Current.clear(); 10966 // We've hit a cycle. 10967 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10968 Current.count(TCanonical)) { 10969 // If we haven't diagnosed this cycle yet, do so now. 10970 if (!Invalid.count(TCanonical)) { 10971 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10972 diag::warn_delegating_ctor_cycle) 10973 << Ctor; 10974 10975 // Don't add a note for a function delegating directo to itself. 10976 if (TCanonical != Canonical) 10977 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10978 10979 CXXConstructorDecl *C = Target; 10980 while (C->getCanonicalDecl() != Canonical) { 10981 (void)C->getTargetConstructor()->hasBody(FNTarget); 10982 assert(FNTarget && "Ctor cycle through bodiless function"); 10983 10984 C 10985 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10986 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10987 } 10988 } 10989 10990 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10991 Invalid.insert(*CI); 10992 Current.clear(); 10993 } else { 10994 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10995 } 10996} 10997 10998 10999void Sema::CheckDelegatingCtorCycles() { 11000 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11001 11002 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11003 CE = Current.end(); 11004 11005 for (DelegatingCtorDeclsType::iterator 11006 I = DelegatingCtorDecls.begin(ExternalSource), 11007 E = DelegatingCtorDecls.end(); 11008 I != E; ++I) { 11009 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11010 } 11011 11012 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11013 (*CI)->setInvalidDecl(); 11014} 11015 11016/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11017Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11018 // Implicitly declared functions (e.g. copy constructors) are 11019 // __host__ __device__ 11020 if (D->isImplicit()) 11021 return CFT_HostDevice; 11022 11023 if (D->hasAttr<CUDAGlobalAttr>()) 11024 return CFT_Global; 11025 11026 if (D->hasAttr<CUDADeviceAttr>()) { 11027 if (D->hasAttr<CUDAHostAttr>()) 11028 return CFT_HostDevice; 11029 else 11030 return CFT_Device; 11031 } 11032 11033 return CFT_Host; 11034} 11035 11036bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11037 CUDAFunctionTarget CalleeTarget) { 11038 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11039 // Callable from the device only." 11040 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11041 return true; 11042 11043 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11044 // Callable from the host only." 11045 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11046 // Callable from the host only." 11047 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11048 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11049 return true; 11050 11051 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11052 return true; 11053 11054 return false; 11055} 11056