SemaDeclCXX.cpp revision 225736
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().Microsoft) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 ExprTy *BW, const VirtSpecifiers &VS, 1064 ExprTy *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = D.isDeclarationOfFunction(); 1083 1084 // C++ 9.2p6: A member shall not be declared to have automatic storage 1085 // duration (auto, register) or with the extern storage-class-specifier. 1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1087 // data members and cannot be applied to names declared const or static, 1088 // and cannot be applied to reference members. 1089 switch (DS.getStorageClassSpec()) { 1090 case DeclSpec::SCS_unspecified: 1091 case DeclSpec::SCS_typedef: 1092 case DeclSpec::SCS_static: 1093 // FALL THROUGH. 1094 break; 1095 case DeclSpec::SCS_mutable: 1096 if (isFunc) { 1097 if (DS.getStorageClassSpecLoc().isValid()) 1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1099 else 1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1101 1102 // FIXME: It would be nicer if the keyword was ignored only for this 1103 // declarator. Otherwise we could get follow-up errors. 1104 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1105 } 1106 break; 1107 default: 1108 if (DS.getStorageClassSpecLoc().isValid()) 1109 Diag(DS.getStorageClassSpecLoc(), 1110 diag::err_storageclass_invalid_for_member); 1111 else 1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1113 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1114 } 1115 1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1118 !isFunc); 1119 1120 Decl *Member; 1121 if (isInstField) { 1122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1123 1124 if (SS.isSet() && !SS.isInvalid()) { 1125 // The user provided a superfluous scope specifier inside a class 1126 // definition: 1127 // 1128 // class X { 1129 // int X::member; 1130 // }; 1131 DeclContext *DC = 0; 1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1134 << Name << FixItHint::CreateRemoval(SS.getRange()); 1135 else 1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1137 << Name << SS.getRange(); 1138 1139 SS.clear(); 1140 } 1141 1142 // FIXME: Check for template parameters! 1143 // FIXME: Check that the name is an identifier! 1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1145 HasDeferredInit, AS); 1146 assert(Member && "HandleField never returns null"); 1147 } else { 1148 assert(!HasDeferredInit); 1149 1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1151 if (!Member) { 1152 return 0; 1153 } 1154 1155 // Non-instance-fields can't have a bitfield. 1156 if (BitWidth) { 1157 if (Member->isInvalidDecl()) { 1158 // don't emit another diagnostic. 1159 } else if (isa<VarDecl>(Member)) { 1160 // C++ 9.6p3: A bit-field shall not be a static member. 1161 // "static member 'A' cannot be a bit-field" 1162 Diag(Loc, diag::err_static_not_bitfield) 1163 << Name << BitWidth->getSourceRange(); 1164 } else if (isa<TypedefDecl>(Member)) { 1165 // "typedef member 'x' cannot be a bit-field" 1166 Diag(Loc, diag::err_typedef_not_bitfield) 1167 << Name << BitWidth->getSourceRange(); 1168 } else { 1169 // A function typedef ("typedef int f(); f a;"). 1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1171 Diag(Loc, diag::err_not_integral_type_bitfield) 1172 << Name << cast<ValueDecl>(Member)->getType() 1173 << BitWidth->getSourceRange(); 1174 } 1175 1176 BitWidth = 0; 1177 Member->setInvalidDecl(); 1178 } 1179 1180 Member->setAccess(AS); 1181 1182 // If we have declared a member function template, set the access of the 1183 // templated declaration as well. 1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1185 FunTmpl->getTemplatedDecl()->setAccess(AS); 1186 } 1187 1188 if (VS.isOverrideSpecified()) { 1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1190 if (!MD || !MD->isVirtual()) { 1191 Diag(Member->getLocStart(), 1192 diag::override_keyword_only_allowed_on_virtual_member_functions) 1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1194 } else 1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1196 } 1197 if (VS.isFinalSpecified()) { 1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1199 if (!MD || !MD->isVirtual()) { 1200 Diag(Member->getLocStart(), 1201 diag::override_keyword_only_allowed_on_virtual_member_functions) 1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1203 } else 1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1205 } 1206 1207 if (VS.getLastLocation().isValid()) { 1208 // Update the end location of a method that has a virt-specifiers. 1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1210 MD->setRangeEnd(VS.getLastLocation()); 1211 } 1212 1213 CheckOverrideControl(Member); 1214 1215 assert((Name || isInstField) && "No identifier for non-field ?"); 1216 1217 if (Init) 1218 AddInitializerToDecl(Member, Init, false, 1219 DS.getTypeSpecType() == DeclSpec::TST_auto); 1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1223 // data member if a brace-or-equal-initializer is provided. 1224 Diag(Loc, diag::err_auto_var_requires_init) 1225 << Name << cast<ValueDecl>(Member)->getType(); 1226 Member->setInvalidDecl(); 1227 } 1228 1229 FinalizeDeclaration(Member); 1230 1231 if (isInstField) 1232 FieldCollector->Add(cast<FieldDecl>(Member)); 1233 return Member; 1234} 1235 1236/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1237/// in-class initializer for a non-static C++ class member. Such parsing 1238/// is deferred until the class is complete. 1239void 1240Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1241 Expr *InitExpr) { 1242 FieldDecl *FD = cast<FieldDecl>(D); 1243 1244 if (!InitExpr) { 1245 FD->setInvalidDecl(); 1246 FD->removeInClassInitializer(); 1247 return; 1248 } 1249 1250 ExprResult Init = InitExpr; 1251 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1252 // FIXME: if there is no EqualLoc, this is list-initialization. 1253 Init = PerformCopyInitialization( 1254 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1255 if (Init.isInvalid()) { 1256 FD->setInvalidDecl(); 1257 return; 1258 } 1259 1260 CheckImplicitConversions(Init.get(), EqualLoc); 1261 } 1262 1263 // C++0x [class.base.init]p7: 1264 // The initialization of each base and member constitutes a 1265 // full-expression. 1266 Init = MaybeCreateExprWithCleanups(Init); 1267 if (Init.isInvalid()) { 1268 FD->setInvalidDecl(); 1269 return; 1270 } 1271 1272 InitExpr = Init.release(); 1273 1274 FD->setInClassInitializer(InitExpr); 1275} 1276 1277/// \brief Find the direct and/or virtual base specifiers that 1278/// correspond to the given base type, for use in base initialization 1279/// within a constructor. 1280static bool FindBaseInitializer(Sema &SemaRef, 1281 CXXRecordDecl *ClassDecl, 1282 QualType BaseType, 1283 const CXXBaseSpecifier *&DirectBaseSpec, 1284 const CXXBaseSpecifier *&VirtualBaseSpec) { 1285 // First, check for a direct base class. 1286 DirectBaseSpec = 0; 1287 for (CXXRecordDecl::base_class_const_iterator Base 1288 = ClassDecl->bases_begin(); 1289 Base != ClassDecl->bases_end(); ++Base) { 1290 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1291 // We found a direct base of this type. That's what we're 1292 // initializing. 1293 DirectBaseSpec = &*Base; 1294 break; 1295 } 1296 } 1297 1298 // Check for a virtual base class. 1299 // FIXME: We might be able to short-circuit this if we know in advance that 1300 // there are no virtual bases. 1301 VirtualBaseSpec = 0; 1302 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1303 // We haven't found a base yet; search the class hierarchy for a 1304 // virtual base class. 1305 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1306 /*DetectVirtual=*/false); 1307 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1308 BaseType, Paths)) { 1309 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1310 Path != Paths.end(); ++Path) { 1311 if (Path->back().Base->isVirtual()) { 1312 VirtualBaseSpec = Path->back().Base; 1313 break; 1314 } 1315 } 1316 } 1317 } 1318 1319 return DirectBaseSpec || VirtualBaseSpec; 1320} 1321 1322/// ActOnMemInitializer - Handle a C++ member initializer. 1323MemInitResult 1324Sema::ActOnMemInitializer(Decl *ConstructorD, 1325 Scope *S, 1326 CXXScopeSpec &SS, 1327 IdentifierInfo *MemberOrBase, 1328 ParsedType TemplateTypeTy, 1329 SourceLocation IdLoc, 1330 SourceLocation LParenLoc, 1331 ExprTy **Args, unsigned NumArgs, 1332 SourceLocation RParenLoc, 1333 SourceLocation EllipsisLoc) { 1334 if (!ConstructorD) 1335 return true; 1336 1337 AdjustDeclIfTemplate(ConstructorD); 1338 1339 CXXConstructorDecl *Constructor 1340 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1341 if (!Constructor) { 1342 // The user wrote a constructor initializer on a function that is 1343 // not a C++ constructor. Ignore the error for now, because we may 1344 // have more member initializers coming; we'll diagnose it just 1345 // once in ActOnMemInitializers. 1346 return true; 1347 } 1348 1349 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1350 1351 // C++ [class.base.init]p2: 1352 // Names in a mem-initializer-id are looked up in the scope of the 1353 // constructor's class and, if not found in that scope, are looked 1354 // up in the scope containing the constructor's definition. 1355 // [Note: if the constructor's class contains a member with the 1356 // same name as a direct or virtual base class of the class, a 1357 // mem-initializer-id naming the member or base class and composed 1358 // of a single identifier refers to the class member. A 1359 // mem-initializer-id for the hidden base class may be specified 1360 // using a qualified name. ] 1361 if (!SS.getScopeRep() && !TemplateTypeTy) { 1362 // Look for a member, first. 1363 FieldDecl *Member = 0; 1364 DeclContext::lookup_result Result 1365 = ClassDecl->lookup(MemberOrBase); 1366 if (Result.first != Result.second) { 1367 Member = dyn_cast<FieldDecl>(*Result.first); 1368 1369 if (Member) { 1370 if (EllipsisLoc.isValid()) 1371 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1372 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1373 1374 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1375 LParenLoc, RParenLoc); 1376 } 1377 1378 // Handle anonymous union case. 1379 if (IndirectFieldDecl* IndirectField 1380 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1381 if (EllipsisLoc.isValid()) 1382 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1383 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1384 1385 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1386 NumArgs, IdLoc, 1387 LParenLoc, RParenLoc); 1388 } 1389 } 1390 } 1391 // It didn't name a member, so see if it names a class. 1392 QualType BaseType; 1393 TypeSourceInfo *TInfo = 0; 1394 1395 if (TemplateTypeTy) { 1396 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1397 } else { 1398 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1399 LookupParsedName(R, S, &SS); 1400 1401 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1402 if (!TyD) { 1403 if (R.isAmbiguous()) return true; 1404 1405 // We don't want access-control diagnostics here. 1406 R.suppressDiagnostics(); 1407 1408 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1409 bool NotUnknownSpecialization = false; 1410 DeclContext *DC = computeDeclContext(SS, false); 1411 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1412 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1413 1414 if (!NotUnknownSpecialization) { 1415 // When the scope specifier can refer to a member of an unknown 1416 // specialization, we take it as a type name. 1417 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1418 SS.getWithLocInContext(Context), 1419 *MemberOrBase, IdLoc); 1420 if (BaseType.isNull()) 1421 return true; 1422 1423 R.clear(); 1424 R.setLookupName(MemberOrBase); 1425 } 1426 } 1427 1428 // If no results were found, try to correct typos. 1429 TypoCorrection Corr; 1430 if (R.empty() && BaseType.isNull() && 1431 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1432 ClassDecl, false, CTC_NoKeywords))) { 1433 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1434 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1435 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1436 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1437 // We have found a non-static data member with a similar 1438 // name to what was typed; complain and initialize that 1439 // member. 1440 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1441 << MemberOrBase << true << CorrectedQuotedStr 1442 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1443 Diag(Member->getLocation(), diag::note_previous_decl) 1444 << CorrectedQuotedStr; 1445 1446 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1447 LParenLoc, RParenLoc); 1448 } 1449 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1450 const CXXBaseSpecifier *DirectBaseSpec; 1451 const CXXBaseSpecifier *VirtualBaseSpec; 1452 if (FindBaseInitializer(*this, ClassDecl, 1453 Context.getTypeDeclType(Type), 1454 DirectBaseSpec, VirtualBaseSpec)) { 1455 // We have found a direct or virtual base class with a 1456 // similar name to what was typed; complain and initialize 1457 // that base class. 1458 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1459 << MemberOrBase << false << CorrectedQuotedStr 1460 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1461 1462 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1463 : VirtualBaseSpec; 1464 Diag(BaseSpec->getSourceRange().getBegin(), 1465 diag::note_base_class_specified_here) 1466 << BaseSpec->getType() 1467 << BaseSpec->getSourceRange(); 1468 1469 TyD = Type; 1470 } 1471 } 1472 } 1473 1474 if (!TyD && BaseType.isNull()) { 1475 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1476 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1477 return true; 1478 } 1479 } 1480 1481 if (BaseType.isNull()) { 1482 BaseType = Context.getTypeDeclType(TyD); 1483 if (SS.isSet()) { 1484 NestedNameSpecifier *Qualifier = 1485 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1486 1487 // FIXME: preserve source range information 1488 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1489 } 1490 } 1491 } 1492 1493 if (!TInfo) 1494 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1495 1496 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1497 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1498} 1499 1500/// Checks an initializer expression for use of uninitialized fields, such as 1501/// containing the field that is being initialized. Returns true if there is an 1502/// uninitialized field was used an updates the SourceLocation parameter; false 1503/// otherwise. 1504static bool InitExprContainsUninitializedFields(const Stmt *S, 1505 const ValueDecl *LhsField, 1506 SourceLocation *L) { 1507 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1508 1509 if (isa<CallExpr>(S)) { 1510 // Do not descend into function calls or constructors, as the use 1511 // of an uninitialized field may be valid. One would have to inspect 1512 // the contents of the function/ctor to determine if it is safe or not. 1513 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1514 // may be safe, depending on what the function/ctor does. 1515 return false; 1516 } 1517 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1518 const NamedDecl *RhsField = ME->getMemberDecl(); 1519 1520 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1521 // The member expression points to a static data member. 1522 assert(VD->isStaticDataMember() && 1523 "Member points to non-static data member!"); 1524 (void)VD; 1525 return false; 1526 } 1527 1528 if (isa<EnumConstantDecl>(RhsField)) { 1529 // The member expression points to an enum. 1530 return false; 1531 } 1532 1533 if (RhsField == LhsField) { 1534 // Initializing a field with itself. Throw a warning. 1535 // But wait; there are exceptions! 1536 // Exception #1: The field may not belong to this record. 1537 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1538 const Expr *base = ME->getBase(); 1539 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1540 // Even though the field matches, it does not belong to this record. 1541 return false; 1542 } 1543 // None of the exceptions triggered; return true to indicate an 1544 // uninitialized field was used. 1545 *L = ME->getMemberLoc(); 1546 return true; 1547 } 1548 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1549 // sizeof/alignof doesn't reference contents, do not warn. 1550 return false; 1551 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1552 // address-of doesn't reference contents (the pointer may be dereferenced 1553 // in the same expression but it would be rare; and weird). 1554 if (UOE->getOpcode() == UO_AddrOf) 1555 return false; 1556 } 1557 for (Stmt::const_child_range it = S->children(); it; ++it) { 1558 if (!*it) { 1559 // An expression such as 'member(arg ?: "")' may trigger this. 1560 continue; 1561 } 1562 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1563 return true; 1564 } 1565 return false; 1566} 1567 1568MemInitResult 1569Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1570 unsigned NumArgs, SourceLocation IdLoc, 1571 SourceLocation LParenLoc, 1572 SourceLocation RParenLoc) { 1573 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1574 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1575 assert((DirectMember || IndirectMember) && 1576 "Member must be a FieldDecl or IndirectFieldDecl"); 1577 1578 if (Member->isInvalidDecl()) 1579 return true; 1580 1581 // Diagnose value-uses of fields to initialize themselves, e.g. 1582 // foo(foo) 1583 // where foo is not also a parameter to the constructor. 1584 // TODO: implement -Wuninitialized and fold this into that framework. 1585 for (unsigned i = 0; i < NumArgs; ++i) { 1586 SourceLocation L; 1587 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1588 // FIXME: Return true in the case when other fields are used before being 1589 // uninitialized. For example, let this field be the i'th field. When 1590 // initializing the i'th field, throw a warning if any of the >= i'th 1591 // fields are used, as they are not yet initialized. 1592 // Right now we are only handling the case where the i'th field uses 1593 // itself in its initializer. 1594 Diag(L, diag::warn_field_is_uninit); 1595 } 1596 } 1597 1598 bool HasDependentArg = false; 1599 for (unsigned i = 0; i < NumArgs; i++) 1600 HasDependentArg |= Args[i]->isTypeDependent(); 1601 1602 Expr *Init; 1603 if (Member->getType()->isDependentType() || HasDependentArg) { 1604 // Can't check initialization for a member of dependent type or when 1605 // any of the arguments are type-dependent expressions. 1606 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1607 RParenLoc, 1608 Member->getType().getNonReferenceType()); 1609 1610 DiscardCleanupsInEvaluationContext(); 1611 } else { 1612 // Initialize the member. 1613 InitializedEntity MemberEntity = 1614 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1615 : InitializedEntity::InitializeMember(IndirectMember, 0); 1616 InitializationKind Kind = 1617 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1618 1619 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1620 1621 ExprResult MemberInit = 1622 InitSeq.Perform(*this, MemberEntity, Kind, 1623 MultiExprArg(*this, Args, NumArgs), 0); 1624 if (MemberInit.isInvalid()) 1625 return true; 1626 1627 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1628 1629 // C++0x [class.base.init]p7: 1630 // The initialization of each base and member constitutes a 1631 // full-expression. 1632 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1633 if (MemberInit.isInvalid()) 1634 return true; 1635 1636 // If we are in a dependent context, template instantiation will 1637 // perform this type-checking again. Just save the arguments that we 1638 // received in a ParenListExpr. 1639 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1640 // of the information that we have about the member 1641 // initializer. However, deconstructing the ASTs is a dicey process, 1642 // and this approach is far more likely to get the corner cases right. 1643 if (CurContext->isDependentContext()) 1644 Init = new (Context) ParenListExpr( 1645 Context, LParenLoc, Args, NumArgs, RParenLoc, 1646 Member->getType().getNonReferenceType()); 1647 else 1648 Init = MemberInit.get(); 1649 } 1650 1651 if (DirectMember) { 1652 return new (Context) CXXCtorInitializer(Context, DirectMember, 1653 IdLoc, LParenLoc, Init, 1654 RParenLoc); 1655 } else { 1656 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1657 IdLoc, LParenLoc, Init, 1658 RParenLoc); 1659 } 1660} 1661 1662MemInitResult 1663Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1664 Expr **Args, unsigned NumArgs, 1665 SourceLocation NameLoc, 1666 SourceLocation LParenLoc, 1667 SourceLocation RParenLoc, 1668 CXXRecordDecl *ClassDecl) { 1669 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1670 if (!LangOpts.CPlusPlus0x) 1671 return Diag(Loc, diag::err_delegation_0x_only) 1672 << TInfo->getTypeLoc().getLocalSourceRange(); 1673 1674 // Initialize the object. 1675 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1676 QualType(ClassDecl->getTypeForDecl(), 0)); 1677 InitializationKind Kind = 1678 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1679 1680 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1681 1682 ExprResult DelegationInit = 1683 InitSeq.Perform(*this, DelegationEntity, Kind, 1684 MultiExprArg(*this, Args, NumArgs), 0); 1685 if (DelegationInit.isInvalid()) 1686 return true; 1687 1688 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1689 CXXConstructorDecl *Constructor 1690 = ConExpr->getConstructor(); 1691 assert(Constructor && "Delegating constructor with no target?"); 1692 1693 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1694 1695 // C++0x [class.base.init]p7: 1696 // The initialization of each base and member constitutes a 1697 // full-expression. 1698 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1699 if (DelegationInit.isInvalid()) 1700 return true; 1701 1702 assert(!CurContext->isDependentContext()); 1703 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1704 DelegationInit.takeAs<Expr>(), 1705 RParenLoc); 1706} 1707 1708MemInitResult 1709Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1710 Expr **Args, unsigned NumArgs, 1711 SourceLocation LParenLoc, SourceLocation RParenLoc, 1712 CXXRecordDecl *ClassDecl, 1713 SourceLocation EllipsisLoc) { 1714 bool HasDependentArg = false; 1715 for (unsigned i = 0; i < NumArgs; i++) 1716 HasDependentArg |= Args[i]->isTypeDependent(); 1717 1718 SourceLocation BaseLoc 1719 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1720 1721 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1722 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1723 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1724 1725 // C++ [class.base.init]p2: 1726 // [...] Unless the mem-initializer-id names a nonstatic data 1727 // member of the constructor's class or a direct or virtual base 1728 // of that class, the mem-initializer is ill-formed. A 1729 // mem-initializer-list can initialize a base class using any 1730 // name that denotes that base class type. 1731 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1732 1733 if (EllipsisLoc.isValid()) { 1734 // This is a pack expansion. 1735 if (!BaseType->containsUnexpandedParameterPack()) { 1736 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1737 << SourceRange(BaseLoc, RParenLoc); 1738 1739 EllipsisLoc = SourceLocation(); 1740 } 1741 } else { 1742 // Check for any unexpanded parameter packs. 1743 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1744 return true; 1745 1746 for (unsigned I = 0; I != NumArgs; ++I) 1747 if (DiagnoseUnexpandedParameterPack(Args[I])) 1748 return true; 1749 } 1750 1751 // Check for direct and virtual base classes. 1752 const CXXBaseSpecifier *DirectBaseSpec = 0; 1753 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1754 if (!Dependent) { 1755 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1756 BaseType)) 1757 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1758 LParenLoc, RParenLoc, ClassDecl); 1759 1760 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1761 VirtualBaseSpec); 1762 1763 // C++ [base.class.init]p2: 1764 // Unless the mem-initializer-id names a nonstatic data member of the 1765 // constructor's class or a direct or virtual base of that class, the 1766 // mem-initializer is ill-formed. 1767 if (!DirectBaseSpec && !VirtualBaseSpec) { 1768 // If the class has any dependent bases, then it's possible that 1769 // one of those types will resolve to the same type as 1770 // BaseType. Therefore, just treat this as a dependent base 1771 // class initialization. FIXME: Should we try to check the 1772 // initialization anyway? It seems odd. 1773 if (ClassDecl->hasAnyDependentBases()) 1774 Dependent = true; 1775 else 1776 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1777 << BaseType << Context.getTypeDeclType(ClassDecl) 1778 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1779 } 1780 } 1781 1782 if (Dependent) { 1783 // Can't check initialization for a base of dependent type or when 1784 // any of the arguments are type-dependent expressions. 1785 ExprResult BaseInit 1786 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1787 RParenLoc, BaseType)); 1788 1789 DiscardCleanupsInEvaluationContext(); 1790 1791 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1792 /*IsVirtual=*/false, 1793 LParenLoc, 1794 BaseInit.takeAs<Expr>(), 1795 RParenLoc, 1796 EllipsisLoc); 1797 } 1798 1799 // C++ [base.class.init]p2: 1800 // If a mem-initializer-id is ambiguous because it designates both 1801 // a direct non-virtual base class and an inherited virtual base 1802 // class, the mem-initializer is ill-formed. 1803 if (DirectBaseSpec && VirtualBaseSpec) 1804 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1805 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1806 1807 CXXBaseSpecifier *BaseSpec 1808 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1809 if (!BaseSpec) 1810 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1811 1812 // Initialize the base. 1813 InitializedEntity BaseEntity = 1814 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1815 InitializationKind Kind = 1816 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1817 1818 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1819 1820 ExprResult BaseInit = 1821 InitSeq.Perform(*this, BaseEntity, Kind, 1822 MultiExprArg(*this, Args, NumArgs), 0); 1823 if (BaseInit.isInvalid()) 1824 return true; 1825 1826 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1827 1828 // C++0x [class.base.init]p7: 1829 // The initialization of each base and member constitutes a 1830 // full-expression. 1831 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1832 if (BaseInit.isInvalid()) 1833 return true; 1834 1835 // If we are in a dependent context, template instantiation will 1836 // perform this type-checking again. Just save the arguments that we 1837 // received in a ParenListExpr. 1838 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1839 // of the information that we have about the base 1840 // initializer. However, deconstructing the ASTs is a dicey process, 1841 // and this approach is far more likely to get the corner cases right. 1842 if (CurContext->isDependentContext()) { 1843 ExprResult Init 1844 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1845 RParenLoc, BaseType)); 1846 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1847 BaseSpec->isVirtual(), 1848 LParenLoc, 1849 Init.takeAs<Expr>(), 1850 RParenLoc, 1851 EllipsisLoc); 1852 } 1853 1854 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1855 BaseSpec->isVirtual(), 1856 LParenLoc, 1857 BaseInit.takeAs<Expr>(), 1858 RParenLoc, 1859 EllipsisLoc); 1860} 1861 1862/// ImplicitInitializerKind - How an implicit base or member initializer should 1863/// initialize its base or member. 1864enum ImplicitInitializerKind { 1865 IIK_Default, 1866 IIK_Copy, 1867 IIK_Move 1868}; 1869 1870static bool 1871BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1872 ImplicitInitializerKind ImplicitInitKind, 1873 CXXBaseSpecifier *BaseSpec, 1874 bool IsInheritedVirtualBase, 1875 CXXCtorInitializer *&CXXBaseInit) { 1876 InitializedEntity InitEntity 1877 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1878 IsInheritedVirtualBase); 1879 1880 ExprResult BaseInit; 1881 1882 switch (ImplicitInitKind) { 1883 case IIK_Default: { 1884 InitializationKind InitKind 1885 = InitializationKind::CreateDefault(Constructor->getLocation()); 1886 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1887 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1888 MultiExprArg(SemaRef, 0, 0)); 1889 break; 1890 } 1891 1892 case IIK_Copy: { 1893 ParmVarDecl *Param = Constructor->getParamDecl(0); 1894 QualType ParamType = Param->getType().getNonReferenceType(); 1895 1896 Expr *CopyCtorArg = 1897 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1898 Constructor->getLocation(), ParamType, 1899 VK_LValue, 0); 1900 1901 // Cast to the base class to avoid ambiguities. 1902 QualType ArgTy = 1903 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1904 ParamType.getQualifiers()); 1905 1906 CXXCastPath BasePath; 1907 BasePath.push_back(BaseSpec); 1908 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1909 CK_UncheckedDerivedToBase, 1910 VK_LValue, &BasePath).take(); 1911 1912 InitializationKind InitKind 1913 = InitializationKind::CreateDirect(Constructor->getLocation(), 1914 SourceLocation(), SourceLocation()); 1915 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1916 &CopyCtorArg, 1); 1917 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1918 MultiExprArg(&CopyCtorArg, 1)); 1919 break; 1920 } 1921 1922 case IIK_Move: 1923 assert(false && "Unhandled initializer kind!"); 1924 } 1925 1926 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1927 if (BaseInit.isInvalid()) 1928 return true; 1929 1930 CXXBaseInit = 1931 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1932 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1933 SourceLocation()), 1934 BaseSpec->isVirtual(), 1935 SourceLocation(), 1936 BaseInit.takeAs<Expr>(), 1937 SourceLocation(), 1938 SourceLocation()); 1939 1940 return false; 1941} 1942 1943static bool 1944BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1945 ImplicitInitializerKind ImplicitInitKind, 1946 FieldDecl *Field, 1947 CXXCtorInitializer *&CXXMemberInit) { 1948 if (Field->isInvalidDecl()) 1949 return true; 1950 1951 SourceLocation Loc = Constructor->getLocation(); 1952 1953 if (ImplicitInitKind == IIK_Copy) { 1954 ParmVarDecl *Param = Constructor->getParamDecl(0); 1955 QualType ParamType = Param->getType().getNonReferenceType(); 1956 1957 // Suppress copying zero-width bitfields. 1958 if (const Expr *Width = Field->getBitWidth()) 1959 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1960 return false; 1961 1962 Expr *MemberExprBase = 1963 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1964 Loc, ParamType, VK_LValue, 0); 1965 1966 // Build a reference to this field within the parameter. 1967 CXXScopeSpec SS; 1968 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1969 Sema::LookupMemberName); 1970 MemberLookup.addDecl(Field, AS_public); 1971 MemberLookup.resolveKind(); 1972 ExprResult CopyCtorArg 1973 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1974 ParamType, Loc, 1975 /*IsArrow=*/false, 1976 SS, 1977 /*FirstQualifierInScope=*/0, 1978 MemberLookup, 1979 /*TemplateArgs=*/0); 1980 if (CopyCtorArg.isInvalid()) 1981 return true; 1982 1983 // When the field we are copying is an array, create index variables for 1984 // each dimension of the array. We use these index variables to subscript 1985 // the source array, and other clients (e.g., CodeGen) will perform the 1986 // necessary iteration with these index variables. 1987 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1988 QualType BaseType = Field->getType(); 1989 QualType SizeType = SemaRef.Context.getSizeType(); 1990 while (const ConstantArrayType *Array 1991 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1992 // Create the iteration variable for this array index. 1993 IdentifierInfo *IterationVarName = 0; 1994 { 1995 llvm::SmallString<8> Str; 1996 llvm::raw_svector_ostream OS(Str); 1997 OS << "__i" << IndexVariables.size(); 1998 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1999 } 2000 VarDecl *IterationVar 2001 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2002 IterationVarName, SizeType, 2003 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2004 SC_None, SC_None); 2005 IndexVariables.push_back(IterationVar); 2006 2007 // Create a reference to the iteration variable. 2008 ExprResult IterationVarRef 2009 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2010 assert(!IterationVarRef.isInvalid() && 2011 "Reference to invented variable cannot fail!"); 2012 2013 // Subscript the array with this iteration variable. 2014 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2015 Loc, 2016 IterationVarRef.take(), 2017 Loc); 2018 if (CopyCtorArg.isInvalid()) 2019 return true; 2020 2021 BaseType = Array->getElementType(); 2022 } 2023 2024 // Construct the entity that we will be initializing. For an array, this 2025 // will be first element in the array, which may require several levels 2026 // of array-subscript entities. 2027 llvm::SmallVector<InitializedEntity, 4> Entities; 2028 Entities.reserve(1 + IndexVariables.size()); 2029 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2030 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2031 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2032 0, 2033 Entities.back())); 2034 2035 // Direct-initialize to use the copy constructor. 2036 InitializationKind InitKind = 2037 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2038 2039 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2040 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2041 &CopyCtorArgE, 1); 2042 2043 ExprResult MemberInit 2044 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2045 MultiExprArg(&CopyCtorArgE, 1)); 2046 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2047 if (MemberInit.isInvalid()) 2048 return true; 2049 2050 CXXMemberInit 2051 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 2052 MemberInit.takeAs<Expr>(), Loc, 2053 IndexVariables.data(), 2054 IndexVariables.size()); 2055 return false; 2056 } 2057 2058 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2059 2060 QualType FieldBaseElementType = 2061 SemaRef.Context.getBaseElementType(Field->getType()); 2062 2063 if (FieldBaseElementType->isRecordType()) { 2064 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2065 InitializationKind InitKind = 2066 InitializationKind::CreateDefault(Loc); 2067 2068 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2069 ExprResult MemberInit = 2070 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2071 2072 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2073 if (MemberInit.isInvalid()) 2074 return true; 2075 2076 CXXMemberInit = 2077 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2078 Field, Loc, Loc, 2079 MemberInit.get(), 2080 Loc); 2081 return false; 2082 } 2083 2084 if (!Field->getParent()->isUnion()) { 2085 if (FieldBaseElementType->isReferenceType()) { 2086 SemaRef.Diag(Constructor->getLocation(), 2087 diag::err_uninitialized_member_in_ctor) 2088 << (int)Constructor->isImplicit() 2089 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2090 << 0 << Field->getDeclName(); 2091 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2092 return true; 2093 } 2094 2095 if (FieldBaseElementType.isConstQualified()) { 2096 SemaRef.Diag(Constructor->getLocation(), 2097 diag::err_uninitialized_member_in_ctor) 2098 << (int)Constructor->isImplicit() 2099 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2100 << 1 << Field->getDeclName(); 2101 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2102 return true; 2103 } 2104 } 2105 2106 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2107 FieldBaseElementType->isObjCRetainableType() && 2108 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2109 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2110 // Instant objects: 2111 // Default-initialize Objective-C pointers to NULL. 2112 CXXMemberInit 2113 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2114 Loc, Loc, 2115 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2116 Loc); 2117 return false; 2118 } 2119 2120 // Nothing to initialize. 2121 CXXMemberInit = 0; 2122 return false; 2123} 2124 2125namespace { 2126struct BaseAndFieldInfo { 2127 Sema &S; 2128 CXXConstructorDecl *Ctor; 2129 bool AnyErrorsInInits; 2130 ImplicitInitializerKind IIK; 2131 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2132 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2133 2134 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2135 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2136 // FIXME: Handle implicit move constructors. 2137 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2138 IIK = IIK_Copy; 2139 else 2140 IIK = IIK_Default; 2141 } 2142}; 2143} 2144 2145static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2146 FieldDecl *Top, FieldDecl *Field) { 2147 2148 // Overwhelmingly common case: we have a direct initializer for this field. 2149 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2150 Info.AllToInit.push_back(Init); 2151 return false; 2152 } 2153 2154 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2155 // has a brace-or-equal-initializer, the entity is initialized as specified 2156 // in [dcl.init]. 2157 if (Field->hasInClassInitializer()) { 2158 Info.AllToInit.push_back( 2159 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2160 SourceLocation(), 2161 SourceLocation(), 0, 2162 SourceLocation())); 2163 return false; 2164 } 2165 2166 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2167 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2168 assert(FieldClassType && "anonymous struct/union without record type"); 2169 CXXRecordDecl *FieldClassDecl 2170 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2171 2172 // Even though union members never have non-trivial default 2173 // constructions in C++03, we still build member initializers for aggregate 2174 // record types which can be union members, and C++0x allows non-trivial 2175 // default constructors for union members, so we ensure that only one 2176 // member is initialized for these. 2177 if (FieldClassDecl->isUnion()) { 2178 // First check for an explicit initializer for one field. 2179 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2180 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2181 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2182 Info.AllToInit.push_back(Init); 2183 2184 // Once we've initialized a field of an anonymous union, the union 2185 // field in the class is also initialized, so exit immediately. 2186 return false; 2187 } else if ((*FA)->isAnonymousStructOrUnion()) { 2188 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2189 return true; 2190 } 2191 } 2192 2193 // FIXME: C++0x unrestricted unions might call a default constructor here. 2194 return false; 2195 } else { 2196 // For structs, we simply descend through to initialize all members where 2197 // necessary. 2198 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2199 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2200 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2201 return true; 2202 } 2203 } 2204 } 2205 2206 // Don't try to build an implicit initializer if there were semantic 2207 // errors in any of the initializers (and therefore we might be 2208 // missing some that the user actually wrote). 2209 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2210 return false; 2211 2212 CXXCtorInitializer *Init = 0; 2213 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2214 return true; 2215 2216 if (Init) 2217 Info.AllToInit.push_back(Init); 2218 2219 return false; 2220} 2221 2222bool 2223Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2224 CXXCtorInitializer *Initializer) { 2225 assert(Initializer->isDelegatingInitializer()); 2226 Constructor->setNumCtorInitializers(1); 2227 CXXCtorInitializer **initializer = 2228 new (Context) CXXCtorInitializer*[1]; 2229 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2230 Constructor->setCtorInitializers(initializer); 2231 2232 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2233 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2234 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2235 } 2236 2237 DelegatingCtorDecls.push_back(Constructor); 2238 2239 return false; 2240} 2241 2242bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2243 CXXCtorInitializer **Initializers, 2244 unsigned NumInitializers, 2245 bool AnyErrors) { 2246 if (Constructor->getDeclContext()->isDependentContext()) { 2247 // Just store the initializers as written, they will be checked during 2248 // instantiation. 2249 if (NumInitializers > 0) { 2250 Constructor->setNumCtorInitializers(NumInitializers); 2251 CXXCtorInitializer **baseOrMemberInitializers = 2252 new (Context) CXXCtorInitializer*[NumInitializers]; 2253 memcpy(baseOrMemberInitializers, Initializers, 2254 NumInitializers * sizeof(CXXCtorInitializer*)); 2255 Constructor->setCtorInitializers(baseOrMemberInitializers); 2256 } 2257 2258 return false; 2259 } 2260 2261 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2262 2263 // We need to build the initializer AST according to order of construction 2264 // and not what user specified in the Initializers list. 2265 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2266 if (!ClassDecl) 2267 return true; 2268 2269 bool HadError = false; 2270 2271 for (unsigned i = 0; i < NumInitializers; i++) { 2272 CXXCtorInitializer *Member = Initializers[i]; 2273 2274 if (Member->isBaseInitializer()) 2275 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2276 else 2277 Info.AllBaseFields[Member->getAnyMember()] = Member; 2278 } 2279 2280 // Keep track of the direct virtual bases. 2281 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2282 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2283 E = ClassDecl->bases_end(); I != E; ++I) { 2284 if (I->isVirtual()) 2285 DirectVBases.insert(I); 2286 } 2287 2288 // Push virtual bases before others. 2289 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2290 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2291 2292 if (CXXCtorInitializer *Value 2293 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2294 Info.AllToInit.push_back(Value); 2295 } else if (!AnyErrors) { 2296 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2297 CXXCtorInitializer *CXXBaseInit; 2298 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2299 VBase, IsInheritedVirtualBase, 2300 CXXBaseInit)) { 2301 HadError = true; 2302 continue; 2303 } 2304 2305 Info.AllToInit.push_back(CXXBaseInit); 2306 } 2307 } 2308 2309 // Non-virtual bases. 2310 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2311 E = ClassDecl->bases_end(); Base != E; ++Base) { 2312 // Virtuals are in the virtual base list and already constructed. 2313 if (Base->isVirtual()) 2314 continue; 2315 2316 if (CXXCtorInitializer *Value 2317 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2318 Info.AllToInit.push_back(Value); 2319 } else if (!AnyErrors) { 2320 CXXCtorInitializer *CXXBaseInit; 2321 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2322 Base, /*IsInheritedVirtualBase=*/false, 2323 CXXBaseInit)) { 2324 HadError = true; 2325 continue; 2326 } 2327 2328 Info.AllToInit.push_back(CXXBaseInit); 2329 } 2330 } 2331 2332 // Fields. 2333 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2334 E = ClassDecl->field_end(); Field != E; ++Field) { 2335 if ((*Field)->getType()->isIncompleteArrayType()) { 2336 assert(ClassDecl->hasFlexibleArrayMember() && 2337 "Incomplete array type is not valid"); 2338 continue; 2339 } 2340 if (CollectFieldInitializer(*this, Info, *Field, *Field)) 2341 HadError = true; 2342 } 2343 2344 NumInitializers = Info.AllToInit.size(); 2345 if (NumInitializers > 0) { 2346 Constructor->setNumCtorInitializers(NumInitializers); 2347 CXXCtorInitializer **baseOrMemberInitializers = 2348 new (Context) CXXCtorInitializer*[NumInitializers]; 2349 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2350 NumInitializers * sizeof(CXXCtorInitializer*)); 2351 Constructor->setCtorInitializers(baseOrMemberInitializers); 2352 2353 // Constructors implicitly reference the base and member 2354 // destructors. 2355 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2356 Constructor->getParent()); 2357 } 2358 2359 return HadError; 2360} 2361 2362static void *GetKeyForTopLevelField(FieldDecl *Field) { 2363 // For anonymous unions, use the class declaration as the key. 2364 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2365 if (RT->getDecl()->isAnonymousStructOrUnion()) 2366 return static_cast<void *>(RT->getDecl()); 2367 } 2368 return static_cast<void *>(Field); 2369} 2370 2371static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2372 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2373} 2374 2375static void *GetKeyForMember(ASTContext &Context, 2376 CXXCtorInitializer *Member) { 2377 if (!Member->isAnyMemberInitializer()) 2378 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2379 2380 // For fields injected into the class via declaration of an anonymous union, 2381 // use its anonymous union class declaration as the unique key. 2382 FieldDecl *Field = Member->getAnyMember(); 2383 2384 // If the field is a member of an anonymous struct or union, our key 2385 // is the anonymous record decl that's a direct child of the class. 2386 RecordDecl *RD = Field->getParent(); 2387 if (RD->isAnonymousStructOrUnion()) { 2388 while (true) { 2389 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2390 if (Parent->isAnonymousStructOrUnion()) 2391 RD = Parent; 2392 else 2393 break; 2394 } 2395 2396 return static_cast<void *>(RD); 2397 } 2398 2399 return static_cast<void *>(Field); 2400} 2401 2402static void 2403DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2404 const CXXConstructorDecl *Constructor, 2405 CXXCtorInitializer **Inits, 2406 unsigned NumInits) { 2407 if (Constructor->getDeclContext()->isDependentContext()) 2408 return; 2409 2410 // Don't check initializers order unless the warning is enabled at the 2411 // location of at least one initializer. 2412 bool ShouldCheckOrder = false; 2413 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2414 CXXCtorInitializer *Init = Inits[InitIndex]; 2415 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2416 Init->getSourceLocation()) 2417 != Diagnostic::Ignored) { 2418 ShouldCheckOrder = true; 2419 break; 2420 } 2421 } 2422 if (!ShouldCheckOrder) 2423 return; 2424 2425 // Build the list of bases and members in the order that they'll 2426 // actually be initialized. The explicit initializers should be in 2427 // this same order but may be missing things. 2428 llvm::SmallVector<const void*, 32> IdealInitKeys; 2429 2430 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2431 2432 // 1. Virtual bases. 2433 for (CXXRecordDecl::base_class_const_iterator VBase = 2434 ClassDecl->vbases_begin(), 2435 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2436 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2437 2438 // 2. Non-virtual bases. 2439 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2440 E = ClassDecl->bases_end(); Base != E; ++Base) { 2441 if (Base->isVirtual()) 2442 continue; 2443 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2444 } 2445 2446 // 3. Direct fields. 2447 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2448 E = ClassDecl->field_end(); Field != E; ++Field) 2449 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2450 2451 unsigned NumIdealInits = IdealInitKeys.size(); 2452 unsigned IdealIndex = 0; 2453 2454 CXXCtorInitializer *PrevInit = 0; 2455 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2456 CXXCtorInitializer *Init = Inits[InitIndex]; 2457 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2458 2459 // Scan forward to try to find this initializer in the idealized 2460 // initializers list. 2461 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2462 if (InitKey == IdealInitKeys[IdealIndex]) 2463 break; 2464 2465 // If we didn't find this initializer, it must be because we 2466 // scanned past it on a previous iteration. That can only 2467 // happen if we're out of order; emit a warning. 2468 if (IdealIndex == NumIdealInits && PrevInit) { 2469 Sema::SemaDiagnosticBuilder D = 2470 SemaRef.Diag(PrevInit->getSourceLocation(), 2471 diag::warn_initializer_out_of_order); 2472 2473 if (PrevInit->isAnyMemberInitializer()) 2474 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2475 else 2476 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2477 2478 if (Init->isAnyMemberInitializer()) 2479 D << 0 << Init->getAnyMember()->getDeclName(); 2480 else 2481 D << 1 << Init->getBaseClassInfo()->getType(); 2482 2483 // Move back to the initializer's location in the ideal list. 2484 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2485 if (InitKey == IdealInitKeys[IdealIndex]) 2486 break; 2487 2488 assert(IdealIndex != NumIdealInits && 2489 "initializer not found in initializer list"); 2490 } 2491 2492 PrevInit = Init; 2493 } 2494} 2495 2496namespace { 2497bool CheckRedundantInit(Sema &S, 2498 CXXCtorInitializer *Init, 2499 CXXCtorInitializer *&PrevInit) { 2500 if (!PrevInit) { 2501 PrevInit = Init; 2502 return false; 2503 } 2504 2505 if (FieldDecl *Field = Init->getMember()) 2506 S.Diag(Init->getSourceLocation(), 2507 diag::err_multiple_mem_initialization) 2508 << Field->getDeclName() 2509 << Init->getSourceRange(); 2510 else { 2511 const Type *BaseClass = Init->getBaseClass(); 2512 assert(BaseClass && "neither field nor base"); 2513 S.Diag(Init->getSourceLocation(), 2514 diag::err_multiple_base_initialization) 2515 << QualType(BaseClass, 0) 2516 << Init->getSourceRange(); 2517 } 2518 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2519 << 0 << PrevInit->getSourceRange(); 2520 2521 return true; 2522} 2523 2524typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2525typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2526 2527bool CheckRedundantUnionInit(Sema &S, 2528 CXXCtorInitializer *Init, 2529 RedundantUnionMap &Unions) { 2530 FieldDecl *Field = Init->getAnyMember(); 2531 RecordDecl *Parent = Field->getParent(); 2532 if (!Parent->isAnonymousStructOrUnion()) 2533 return false; 2534 2535 NamedDecl *Child = Field; 2536 do { 2537 if (Parent->isUnion()) { 2538 UnionEntry &En = Unions[Parent]; 2539 if (En.first && En.first != Child) { 2540 S.Diag(Init->getSourceLocation(), 2541 diag::err_multiple_mem_union_initialization) 2542 << Field->getDeclName() 2543 << Init->getSourceRange(); 2544 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2545 << 0 << En.second->getSourceRange(); 2546 return true; 2547 } else if (!En.first) { 2548 En.first = Child; 2549 En.second = Init; 2550 } 2551 } 2552 2553 Child = Parent; 2554 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2555 } while (Parent->isAnonymousStructOrUnion()); 2556 2557 return false; 2558} 2559} 2560 2561/// ActOnMemInitializers - Handle the member initializers for a constructor. 2562void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2563 SourceLocation ColonLoc, 2564 MemInitTy **meminits, unsigned NumMemInits, 2565 bool AnyErrors) { 2566 if (!ConstructorDecl) 2567 return; 2568 2569 AdjustDeclIfTemplate(ConstructorDecl); 2570 2571 CXXConstructorDecl *Constructor 2572 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2573 2574 if (!Constructor) { 2575 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2576 return; 2577 } 2578 2579 CXXCtorInitializer **MemInits = 2580 reinterpret_cast<CXXCtorInitializer **>(meminits); 2581 2582 // Mapping for the duplicate initializers check. 2583 // For member initializers, this is keyed with a FieldDecl*. 2584 // For base initializers, this is keyed with a Type*. 2585 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2586 2587 // Mapping for the inconsistent anonymous-union initializers check. 2588 RedundantUnionMap MemberUnions; 2589 2590 bool HadError = false; 2591 for (unsigned i = 0; i < NumMemInits; i++) { 2592 CXXCtorInitializer *Init = MemInits[i]; 2593 2594 // Set the source order index. 2595 Init->setSourceOrder(i); 2596 2597 if (Init->isAnyMemberInitializer()) { 2598 FieldDecl *Field = Init->getAnyMember(); 2599 if (CheckRedundantInit(*this, Init, Members[Field]) || 2600 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2601 HadError = true; 2602 } else if (Init->isBaseInitializer()) { 2603 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2604 if (CheckRedundantInit(*this, Init, Members[Key])) 2605 HadError = true; 2606 } else { 2607 assert(Init->isDelegatingInitializer()); 2608 // This must be the only initializer 2609 if (i != 0 || NumMemInits > 1) { 2610 Diag(MemInits[0]->getSourceLocation(), 2611 diag::err_delegating_initializer_alone) 2612 << MemInits[0]->getSourceRange(); 2613 HadError = true; 2614 // We will treat this as being the only initializer. 2615 } 2616 SetDelegatingInitializer(Constructor, MemInits[i]); 2617 // Return immediately as the initializer is set. 2618 return; 2619 } 2620 } 2621 2622 if (HadError) 2623 return; 2624 2625 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2626 2627 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2628} 2629 2630void 2631Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2632 CXXRecordDecl *ClassDecl) { 2633 // Ignore dependent contexts. 2634 if (ClassDecl->isDependentContext()) 2635 return; 2636 2637 // FIXME: all the access-control diagnostics are positioned on the 2638 // field/base declaration. That's probably good; that said, the 2639 // user might reasonably want to know why the destructor is being 2640 // emitted, and we currently don't say. 2641 2642 // Non-static data members. 2643 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2644 E = ClassDecl->field_end(); I != E; ++I) { 2645 FieldDecl *Field = *I; 2646 if (Field->isInvalidDecl()) 2647 continue; 2648 QualType FieldType = Context.getBaseElementType(Field->getType()); 2649 2650 const RecordType* RT = FieldType->getAs<RecordType>(); 2651 if (!RT) 2652 continue; 2653 2654 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2655 if (FieldClassDecl->isInvalidDecl()) 2656 continue; 2657 if (FieldClassDecl->hasTrivialDestructor()) 2658 continue; 2659 2660 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2661 assert(Dtor && "No dtor found for FieldClassDecl!"); 2662 CheckDestructorAccess(Field->getLocation(), Dtor, 2663 PDiag(diag::err_access_dtor_field) 2664 << Field->getDeclName() 2665 << FieldType); 2666 2667 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2668 } 2669 2670 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2671 2672 // Bases. 2673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2674 E = ClassDecl->bases_end(); Base != E; ++Base) { 2675 // Bases are always records in a well-formed non-dependent class. 2676 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2677 2678 // Remember direct virtual bases. 2679 if (Base->isVirtual()) 2680 DirectVirtualBases.insert(RT); 2681 2682 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2683 // If our base class is invalid, we probably can't get its dtor anyway. 2684 if (BaseClassDecl->isInvalidDecl()) 2685 continue; 2686 // Ignore trivial destructors. 2687 if (BaseClassDecl->hasTrivialDestructor()) 2688 continue; 2689 2690 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2691 assert(Dtor && "No dtor found for BaseClassDecl!"); 2692 2693 // FIXME: caret should be on the start of the class name 2694 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2695 PDiag(diag::err_access_dtor_base) 2696 << Base->getType() 2697 << Base->getSourceRange()); 2698 2699 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2700 } 2701 2702 // Virtual bases. 2703 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2704 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2705 2706 // Bases are always records in a well-formed non-dependent class. 2707 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2708 2709 // Ignore direct virtual bases. 2710 if (DirectVirtualBases.count(RT)) 2711 continue; 2712 2713 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2714 // If our base class is invalid, we probably can't get its dtor anyway. 2715 if (BaseClassDecl->isInvalidDecl()) 2716 continue; 2717 // Ignore trivial destructors. 2718 if (BaseClassDecl->hasTrivialDestructor()) 2719 continue; 2720 2721 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2722 assert(Dtor && "No dtor found for BaseClassDecl!"); 2723 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2724 PDiag(diag::err_access_dtor_vbase) 2725 << VBase->getType()); 2726 2727 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2728 } 2729} 2730 2731void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2732 if (!CDtorDecl) 2733 return; 2734 2735 if (CXXConstructorDecl *Constructor 2736 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2737 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2738} 2739 2740bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2741 unsigned DiagID, AbstractDiagSelID SelID) { 2742 if (SelID == -1) 2743 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2744 else 2745 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2746} 2747 2748bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2749 const PartialDiagnostic &PD) { 2750 if (!getLangOptions().CPlusPlus) 2751 return false; 2752 2753 if (const ArrayType *AT = Context.getAsArrayType(T)) 2754 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2755 2756 if (const PointerType *PT = T->getAs<PointerType>()) { 2757 // Find the innermost pointer type. 2758 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2759 PT = T; 2760 2761 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2762 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2763 } 2764 2765 const RecordType *RT = T->getAs<RecordType>(); 2766 if (!RT) 2767 return false; 2768 2769 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2770 2771 // We can't answer whether something is abstract until it has a 2772 // definition. If it's currently being defined, we'll walk back 2773 // over all the declarations when we have a full definition. 2774 const CXXRecordDecl *Def = RD->getDefinition(); 2775 if (!Def || Def->isBeingDefined()) 2776 return false; 2777 2778 if (!RD->isAbstract()) 2779 return false; 2780 2781 Diag(Loc, PD) << RD->getDeclName(); 2782 DiagnoseAbstractType(RD); 2783 2784 return true; 2785} 2786 2787void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2788 // Check if we've already emitted the list of pure virtual functions 2789 // for this class. 2790 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2791 return; 2792 2793 CXXFinalOverriderMap FinalOverriders; 2794 RD->getFinalOverriders(FinalOverriders); 2795 2796 // Keep a set of seen pure methods so we won't diagnose the same method 2797 // more than once. 2798 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2799 2800 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2801 MEnd = FinalOverriders.end(); 2802 M != MEnd; 2803 ++M) { 2804 for (OverridingMethods::iterator SO = M->second.begin(), 2805 SOEnd = M->second.end(); 2806 SO != SOEnd; ++SO) { 2807 // C++ [class.abstract]p4: 2808 // A class is abstract if it contains or inherits at least one 2809 // pure virtual function for which the final overrider is pure 2810 // virtual. 2811 2812 // 2813 if (SO->second.size() != 1) 2814 continue; 2815 2816 if (!SO->second.front().Method->isPure()) 2817 continue; 2818 2819 if (!SeenPureMethods.insert(SO->second.front().Method)) 2820 continue; 2821 2822 Diag(SO->second.front().Method->getLocation(), 2823 diag::note_pure_virtual_function) 2824 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2825 } 2826 } 2827 2828 if (!PureVirtualClassDiagSet) 2829 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2830 PureVirtualClassDiagSet->insert(RD); 2831} 2832 2833namespace { 2834struct AbstractUsageInfo { 2835 Sema &S; 2836 CXXRecordDecl *Record; 2837 CanQualType AbstractType; 2838 bool Invalid; 2839 2840 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2841 : S(S), Record(Record), 2842 AbstractType(S.Context.getCanonicalType( 2843 S.Context.getTypeDeclType(Record))), 2844 Invalid(false) {} 2845 2846 void DiagnoseAbstractType() { 2847 if (Invalid) return; 2848 S.DiagnoseAbstractType(Record); 2849 Invalid = true; 2850 } 2851 2852 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2853}; 2854 2855struct CheckAbstractUsage { 2856 AbstractUsageInfo &Info; 2857 const NamedDecl *Ctx; 2858 2859 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2860 : Info(Info), Ctx(Ctx) {} 2861 2862 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2863 switch (TL.getTypeLocClass()) { 2864#define ABSTRACT_TYPELOC(CLASS, PARENT) 2865#define TYPELOC(CLASS, PARENT) \ 2866 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2867#include "clang/AST/TypeLocNodes.def" 2868 } 2869 } 2870 2871 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2872 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2873 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2874 if (!TL.getArg(I)) 2875 continue; 2876 2877 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2878 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2879 } 2880 } 2881 2882 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2883 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2884 } 2885 2886 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2887 // Visit the type parameters from a permissive context. 2888 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2889 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2890 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2891 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2892 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2893 // TODO: other template argument types? 2894 } 2895 } 2896 2897 // Visit pointee types from a permissive context. 2898#define CheckPolymorphic(Type) \ 2899 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2900 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2901 } 2902 CheckPolymorphic(PointerTypeLoc) 2903 CheckPolymorphic(ReferenceTypeLoc) 2904 CheckPolymorphic(MemberPointerTypeLoc) 2905 CheckPolymorphic(BlockPointerTypeLoc) 2906 2907 /// Handle all the types we haven't given a more specific 2908 /// implementation for above. 2909 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2910 // Every other kind of type that we haven't called out already 2911 // that has an inner type is either (1) sugar or (2) contains that 2912 // inner type in some way as a subobject. 2913 if (TypeLoc Next = TL.getNextTypeLoc()) 2914 return Visit(Next, Sel); 2915 2916 // If there's no inner type and we're in a permissive context, 2917 // don't diagnose. 2918 if (Sel == Sema::AbstractNone) return; 2919 2920 // Check whether the type matches the abstract type. 2921 QualType T = TL.getType(); 2922 if (T->isArrayType()) { 2923 Sel = Sema::AbstractArrayType; 2924 T = Info.S.Context.getBaseElementType(T); 2925 } 2926 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2927 if (CT != Info.AbstractType) return; 2928 2929 // It matched; do some magic. 2930 if (Sel == Sema::AbstractArrayType) { 2931 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2932 << T << TL.getSourceRange(); 2933 } else { 2934 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2935 << Sel << T << TL.getSourceRange(); 2936 } 2937 Info.DiagnoseAbstractType(); 2938 } 2939}; 2940 2941void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2942 Sema::AbstractDiagSelID Sel) { 2943 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2944} 2945 2946} 2947 2948/// Check for invalid uses of an abstract type in a method declaration. 2949static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2950 CXXMethodDecl *MD) { 2951 // No need to do the check on definitions, which require that 2952 // the return/param types be complete. 2953 if (MD->doesThisDeclarationHaveABody()) 2954 return; 2955 2956 // For safety's sake, just ignore it if we don't have type source 2957 // information. This should never happen for non-implicit methods, 2958 // but... 2959 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2960 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2961} 2962 2963/// Check for invalid uses of an abstract type within a class definition. 2964static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2965 CXXRecordDecl *RD) { 2966 for (CXXRecordDecl::decl_iterator 2967 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2968 Decl *D = *I; 2969 if (D->isImplicit()) continue; 2970 2971 // Methods and method templates. 2972 if (isa<CXXMethodDecl>(D)) { 2973 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2974 } else if (isa<FunctionTemplateDecl>(D)) { 2975 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2976 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2977 2978 // Fields and static variables. 2979 } else if (isa<FieldDecl>(D)) { 2980 FieldDecl *FD = cast<FieldDecl>(D); 2981 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2982 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2983 } else if (isa<VarDecl>(D)) { 2984 VarDecl *VD = cast<VarDecl>(D); 2985 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2986 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2987 2988 // Nested classes and class templates. 2989 } else if (isa<CXXRecordDecl>(D)) { 2990 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2991 } else if (isa<ClassTemplateDecl>(D)) { 2992 CheckAbstractClassUsage(Info, 2993 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2994 } 2995 } 2996} 2997 2998/// \brief Perform semantic checks on a class definition that has been 2999/// completing, introducing implicitly-declared members, checking for 3000/// abstract types, etc. 3001void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3002 if (!Record) 3003 return; 3004 3005 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3006 AbstractUsageInfo Info(*this, Record); 3007 CheckAbstractClassUsage(Info, Record); 3008 } 3009 3010 // If this is not an aggregate type and has no user-declared constructor, 3011 // complain about any non-static data members of reference or const scalar 3012 // type, since they will never get initializers. 3013 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3014 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3015 bool Complained = false; 3016 for (RecordDecl::field_iterator F = Record->field_begin(), 3017 FEnd = Record->field_end(); 3018 F != FEnd; ++F) { 3019 if (F->hasInClassInitializer()) 3020 continue; 3021 3022 if (F->getType()->isReferenceType() || 3023 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3024 if (!Complained) { 3025 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3026 << Record->getTagKind() << Record; 3027 Complained = true; 3028 } 3029 3030 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3031 << F->getType()->isReferenceType() 3032 << F->getDeclName(); 3033 } 3034 } 3035 } 3036 3037 if (Record->isDynamicClass() && !Record->isDependentType()) 3038 DynamicClasses.push_back(Record); 3039 3040 if (Record->getIdentifier()) { 3041 // C++ [class.mem]p13: 3042 // If T is the name of a class, then each of the following shall have a 3043 // name different from T: 3044 // - every member of every anonymous union that is a member of class T. 3045 // 3046 // C++ [class.mem]p14: 3047 // In addition, if class T has a user-declared constructor (12.1), every 3048 // non-static data member of class T shall have a name different from T. 3049 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3050 R.first != R.second; ++R.first) { 3051 NamedDecl *D = *R.first; 3052 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3053 isa<IndirectFieldDecl>(D)) { 3054 Diag(D->getLocation(), diag::err_member_name_of_class) 3055 << D->getDeclName(); 3056 break; 3057 } 3058 } 3059 } 3060 3061 // Warn if the class has virtual methods but non-virtual public destructor. 3062 if (Record->isPolymorphic() && !Record->isDependentType()) { 3063 CXXDestructorDecl *dtor = Record->getDestructor(); 3064 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3065 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3066 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3067 } 3068 3069 // See if a method overloads virtual methods in a base 3070 /// class without overriding any. 3071 if (!Record->isDependentType()) { 3072 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3073 MEnd = Record->method_end(); 3074 M != MEnd; ++M) { 3075 if (!(*M)->isStatic()) 3076 DiagnoseHiddenVirtualMethods(Record, *M); 3077 } 3078 } 3079 3080 // Declare inherited constructors. We do this eagerly here because: 3081 // - The standard requires an eager diagnostic for conflicting inherited 3082 // constructors from different classes. 3083 // - The lazy declaration of the other implicit constructors is so as to not 3084 // waste space and performance on classes that are not meant to be 3085 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3086 // have inherited constructors. 3087 DeclareInheritedConstructors(Record); 3088 3089 if (!Record->isDependentType()) 3090 CheckExplicitlyDefaultedMethods(Record); 3091} 3092 3093void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3094 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3095 ME = Record->method_end(); 3096 MI != ME; ++MI) { 3097 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3098 switch (getSpecialMember(*MI)) { 3099 case CXXDefaultConstructor: 3100 CheckExplicitlyDefaultedDefaultConstructor( 3101 cast<CXXConstructorDecl>(*MI)); 3102 break; 3103 3104 case CXXDestructor: 3105 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3106 break; 3107 3108 case CXXCopyConstructor: 3109 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3110 break; 3111 3112 case CXXCopyAssignment: 3113 CheckExplicitlyDefaultedCopyAssignment(*MI); 3114 break; 3115 3116 case CXXMoveConstructor: 3117 case CXXMoveAssignment: 3118 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3119 break; 3120 3121 default: 3122 // FIXME: Do moves once they exist 3123 llvm_unreachable("non-special member explicitly defaulted!"); 3124 } 3125 } 3126 } 3127 3128} 3129 3130void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3131 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3132 3133 // Whether this was the first-declared instance of the constructor. 3134 // This affects whether we implicitly add an exception spec (and, eventually, 3135 // constexpr). It is also ill-formed to explicitly default a constructor such 3136 // that it would be deleted. (C++0x [decl.fct.def.default]) 3137 bool First = CD == CD->getCanonicalDecl(); 3138 3139 bool HadError = false; 3140 if (CD->getNumParams() != 0) { 3141 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3142 << CD->getSourceRange(); 3143 HadError = true; 3144 } 3145 3146 ImplicitExceptionSpecification Spec 3147 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3148 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3149 if (EPI.ExceptionSpecType == EST_Delayed) { 3150 // Exception specification depends on some deferred part of the class. We'll 3151 // try again when the class's definition has been fully processed. 3152 return; 3153 } 3154 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3155 *ExceptionType = Context.getFunctionType( 3156 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3157 3158 if (CtorType->hasExceptionSpec()) { 3159 if (CheckEquivalentExceptionSpec( 3160 PDiag(diag::err_incorrect_defaulted_exception_spec) 3161 << CXXDefaultConstructor, 3162 PDiag(), 3163 ExceptionType, SourceLocation(), 3164 CtorType, CD->getLocation())) { 3165 HadError = true; 3166 } 3167 } else if (First) { 3168 // We set the declaration to have the computed exception spec here. 3169 // We know there are no parameters. 3170 EPI.ExtInfo = CtorType->getExtInfo(); 3171 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3172 } 3173 3174 if (HadError) { 3175 CD->setInvalidDecl(); 3176 return; 3177 } 3178 3179 if (ShouldDeleteDefaultConstructor(CD)) { 3180 if (First) { 3181 CD->setDeletedAsWritten(); 3182 } else { 3183 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3184 << CXXDefaultConstructor; 3185 CD->setInvalidDecl(); 3186 } 3187 } 3188} 3189 3190void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3191 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3192 3193 // Whether this was the first-declared instance of the constructor. 3194 bool First = CD == CD->getCanonicalDecl(); 3195 3196 bool HadError = false; 3197 if (CD->getNumParams() != 1) { 3198 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3199 << CD->getSourceRange(); 3200 HadError = true; 3201 } 3202 3203 ImplicitExceptionSpecification Spec(Context); 3204 bool Const; 3205 llvm::tie(Spec, Const) = 3206 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3207 3208 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3209 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3210 *ExceptionType = Context.getFunctionType( 3211 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3212 3213 // Check for parameter type matching. 3214 // This is a copy ctor so we know it's a cv-qualified reference to T. 3215 QualType ArgType = CtorType->getArgType(0); 3216 if (ArgType->getPointeeType().isVolatileQualified()) { 3217 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3218 HadError = true; 3219 } 3220 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3221 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3222 HadError = true; 3223 } 3224 3225 if (CtorType->hasExceptionSpec()) { 3226 if (CheckEquivalentExceptionSpec( 3227 PDiag(diag::err_incorrect_defaulted_exception_spec) 3228 << CXXCopyConstructor, 3229 PDiag(), 3230 ExceptionType, SourceLocation(), 3231 CtorType, CD->getLocation())) { 3232 HadError = true; 3233 } 3234 } else if (First) { 3235 // We set the declaration to have the computed exception spec here. 3236 // We duplicate the one parameter type. 3237 EPI.ExtInfo = CtorType->getExtInfo(); 3238 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3239 } 3240 3241 if (HadError) { 3242 CD->setInvalidDecl(); 3243 return; 3244 } 3245 3246 if (ShouldDeleteCopyConstructor(CD)) { 3247 if (First) { 3248 CD->setDeletedAsWritten(); 3249 } else { 3250 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3251 << CXXCopyConstructor; 3252 CD->setInvalidDecl(); 3253 } 3254 } 3255} 3256 3257void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3258 assert(MD->isExplicitlyDefaulted()); 3259 3260 // Whether this was the first-declared instance of the operator 3261 bool First = MD == MD->getCanonicalDecl(); 3262 3263 bool HadError = false; 3264 if (MD->getNumParams() != 1) { 3265 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3266 << MD->getSourceRange(); 3267 HadError = true; 3268 } 3269 3270 QualType ReturnType = 3271 MD->getType()->getAs<FunctionType>()->getResultType(); 3272 if (!ReturnType->isLValueReferenceType() || 3273 !Context.hasSameType( 3274 Context.getCanonicalType(ReturnType->getPointeeType()), 3275 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3276 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3277 HadError = true; 3278 } 3279 3280 ImplicitExceptionSpecification Spec(Context); 3281 bool Const; 3282 llvm::tie(Spec, Const) = 3283 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3284 3285 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3286 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3287 *ExceptionType = Context.getFunctionType( 3288 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3289 3290 QualType ArgType = OperType->getArgType(0); 3291 if (!ArgType->isReferenceType()) { 3292 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3293 HadError = true; 3294 } else { 3295 if (ArgType->getPointeeType().isVolatileQualified()) { 3296 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3297 HadError = true; 3298 } 3299 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3300 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3301 HadError = true; 3302 } 3303 } 3304 3305 if (OperType->getTypeQuals()) { 3306 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3307 HadError = true; 3308 } 3309 3310 if (OperType->hasExceptionSpec()) { 3311 if (CheckEquivalentExceptionSpec( 3312 PDiag(diag::err_incorrect_defaulted_exception_spec) 3313 << CXXCopyAssignment, 3314 PDiag(), 3315 ExceptionType, SourceLocation(), 3316 OperType, MD->getLocation())) { 3317 HadError = true; 3318 } 3319 } else if (First) { 3320 // We set the declaration to have the computed exception spec here. 3321 // We duplicate the one parameter type. 3322 EPI.RefQualifier = OperType->getRefQualifier(); 3323 EPI.ExtInfo = OperType->getExtInfo(); 3324 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3325 } 3326 3327 if (HadError) { 3328 MD->setInvalidDecl(); 3329 return; 3330 } 3331 3332 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3333 if (First) { 3334 MD->setDeletedAsWritten(); 3335 } else { 3336 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3337 << CXXCopyAssignment; 3338 MD->setInvalidDecl(); 3339 } 3340 } 3341} 3342 3343void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3344 assert(DD->isExplicitlyDefaulted()); 3345 3346 // Whether this was the first-declared instance of the destructor. 3347 bool First = DD == DD->getCanonicalDecl(); 3348 3349 ImplicitExceptionSpecification Spec 3350 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3351 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3352 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3353 *ExceptionType = Context.getFunctionType( 3354 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3355 3356 if (DtorType->hasExceptionSpec()) { 3357 if (CheckEquivalentExceptionSpec( 3358 PDiag(diag::err_incorrect_defaulted_exception_spec) 3359 << CXXDestructor, 3360 PDiag(), 3361 ExceptionType, SourceLocation(), 3362 DtorType, DD->getLocation())) { 3363 DD->setInvalidDecl(); 3364 return; 3365 } 3366 } else if (First) { 3367 // We set the declaration to have the computed exception spec here. 3368 // There are no parameters. 3369 EPI.ExtInfo = DtorType->getExtInfo(); 3370 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3371 } 3372 3373 if (ShouldDeleteDestructor(DD)) { 3374 if (First) { 3375 DD->setDeletedAsWritten(); 3376 } else { 3377 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3378 << CXXDestructor; 3379 DD->setInvalidDecl(); 3380 } 3381 } 3382} 3383 3384bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3385 CXXRecordDecl *RD = CD->getParent(); 3386 assert(!RD->isDependentType() && "do deletion after instantiation"); 3387 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3388 return false; 3389 3390 SourceLocation Loc = CD->getLocation(); 3391 3392 // Do access control from the constructor 3393 ContextRAII CtorContext(*this, CD); 3394 3395 bool Union = RD->isUnion(); 3396 bool AllConst = true; 3397 3398 // We do this because we should never actually use an anonymous 3399 // union's constructor. 3400 if (Union && RD->isAnonymousStructOrUnion()) 3401 return false; 3402 3403 // FIXME: We should put some diagnostic logic right into this function. 3404 3405 // C++0x [class.ctor]/5 3406 // A defaulted default constructor for class X is defined as deleted if: 3407 3408 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3409 BE = RD->bases_end(); 3410 BI != BE; ++BI) { 3411 // We'll handle this one later 3412 if (BI->isVirtual()) 3413 continue; 3414 3415 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3416 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3417 3418 // -- any [direct base class] has a type with a destructor that is 3419 // deleted or inaccessible from the defaulted default constructor 3420 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3421 if (BaseDtor->isDeleted()) 3422 return true; 3423 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3424 AR_accessible) 3425 return true; 3426 3427 // -- any [direct base class either] has no default constructor or 3428 // overload resolution as applied to [its] default constructor 3429 // results in an ambiguity or in a function that is deleted or 3430 // inaccessible from the defaulted default constructor 3431 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3432 if (!BaseDefault || BaseDefault->isDeleted()) 3433 return true; 3434 3435 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3436 PDiag()) != AR_accessible) 3437 return true; 3438 } 3439 3440 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3441 BE = RD->vbases_end(); 3442 BI != BE; ++BI) { 3443 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3444 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3445 3446 // -- any [virtual base class] has a type with a destructor that is 3447 // delete or inaccessible from the defaulted default constructor 3448 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3449 if (BaseDtor->isDeleted()) 3450 return true; 3451 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3452 AR_accessible) 3453 return true; 3454 3455 // -- any [virtual base class either] has no default constructor or 3456 // overload resolution as applied to [its] default constructor 3457 // results in an ambiguity or in a function that is deleted or 3458 // inaccessible from the defaulted default constructor 3459 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3460 if (!BaseDefault || BaseDefault->isDeleted()) 3461 return true; 3462 3463 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3464 PDiag()) != AR_accessible) 3465 return true; 3466 } 3467 3468 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3469 FE = RD->field_end(); 3470 FI != FE; ++FI) { 3471 if (FI->isInvalidDecl()) 3472 continue; 3473 3474 QualType FieldType = Context.getBaseElementType(FI->getType()); 3475 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3476 3477 // -- any non-static data member with no brace-or-equal-initializer is of 3478 // reference type 3479 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3480 return true; 3481 3482 // -- X is a union and all its variant members are of const-qualified type 3483 // (or array thereof) 3484 if (Union && !FieldType.isConstQualified()) 3485 AllConst = false; 3486 3487 if (FieldRecord) { 3488 // -- X is a union-like class that has a variant member with a non-trivial 3489 // default constructor 3490 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3491 return true; 3492 3493 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3494 if (FieldDtor->isDeleted()) 3495 return true; 3496 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3497 AR_accessible) 3498 return true; 3499 3500 // -- any non-variant non-static data member of const-qualified type (or 3501 // array thereof) with no brace-or-equal-initializer does not have a 3502 // user-provided default constructor 3503 if (FieldType.isConstQualified() && 3504 !FI->hasInClassInitializer() && 3505 !FieldRecord->hasUserProvidedDefaultConstructor()) 3506 return true; 3507 3508 if (!Union && FieldRecord->isUnion() && 3509 FieldRecord->isAnonymousStructOrUnion()) { 3510 // We're okay to reuse AllConst here since we only care about the 3511 // value otherwise if we're in a union. 3512 AllConst = true; 3513 3514 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3515 UE = FieldRecord->field_end(); 3516 UI != UE; ++UI) { 3517 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3518 CXXRecordDecl *UnionFieldRecord = 3519 UnionFieldType->getAsCXXRecordDecl(); 3520 3521 if (!UnionFieldType.isConstQualified()) 3522 AllConst = false; 3523 3524 if (UnionFieldRecord && 3525 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3526 return true; 3527 } 3528 3529 if (AllConst) 3530 return true; 3531 3532 // Don't try to initialize the anonymous union 3533 // This is technically non-conformant, but sanity demands it. 3534 continue; 3535 } 3536 3537 // -- any non-static data member with no brace-or-equal-initializer has 3538 // class type M (or array thereof) and either M has no default 3539 // constructor or overload resolution as applied to M's default 3540 // constructor results in an ambiguity or in a function that is deleted 3541 // or inaccessible from the defaulted default constructor. 3542 if (!FI->hasInClassInitializer()) { 3543 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3544 if (!FieldDefault || FieldDefault->isDeleted()) 3545 return true; 3546 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3547 PDiag()) != AR_accessible) 3548 return true; 3549 } 3550 } else if (!Union && FieldType.isConstQualified() && 3551 !FI->hasInClassInitializer()) { 3552 // -- any non-variant non-static data member of const-qualified type (or 3553 // array thereof) with no brace-or-equal-initializer does not have a 3554 // user-provided default constructor 3555 return true; 3556 } 3557 } 3558 3559 if (Union && AllConst) 3560 return true; 3561 3562 return false; 3563} 3564 3565bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3566 CXXRecordDecl *RD = CD->getParent(); 3567 assert(!RD->isDependentType() && "do deletion after instantiation"); 3568 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3569 return false; 3570 3571 SourceLocation Loc = CD->getLocation(); 3572 3573 // Do access control from the constructor 3574 ContextRAII CtorContext(*this, CD); 3575 3576 bool Union = RD->isUnion(); 3577 3578 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3579 "copy assignment arg has no pointee type"); 3580 unsigned ArgQuals = 3581 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3582 Qualifiers::Const : 0; 3583 3584 // We do this because we should never actually use an anonymous 3585 // union's constructor. 3586 if (Union && RD->isAnonymousStructOrUnion()) 3587 return false; 3588 3589 // FIXME: We should put some diagnostic logic right into this function. 3590 3591 // C++0x [class.copy]/11 3592 // A defaulted [copy] constructor for class X is defined as delete if X has: 3593 3594 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3595 BE = RD->bases_end(); 3596 BI != BE; ++BI) { 3597 // We'll handle this one later 3598 if (BI->isVirtual()) 3599 continue; 3600 3601 QualType BaseType = BI->getType(); 3602 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3603 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3604 3605 // -- any [direct base class] of a type with a destructor that is deleted or 3606 // inaccessible from the defaulted constructor 3607 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3608 if (BaseDtor->isDeleted()) 3609 return true; 3610 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3611 AR_accessible) 3612 return true; 3613 3614 // -- a [direct base class] B that cannot be [copied] because overload 3615 // resolution, as applied to B's [copy] constructor, results in an 3616 // ambiguity or a function that is deleted or inaccessible from the 3617 // defaulted constructor 3618 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3619 if (!BaseCtor || BaseCtor->isDeleted()) 3620 return true; 3621 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3622 AR_accessible) 3623 return true; 3624 } 3625 3626 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3627 BE = RD->vbases_end(); 3628 BI != BE; ++BI) { 3629 QualType BaseType = BI->getType(); 3630 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3631 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3632 3633 // -- any [virtual base class] of a type with a destructor that is deleted or 3634 // inaccessible from the defaulted constructor 3635 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3636 if (BaseDtor->isDeleted()) 3637 return true; 3638 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3639 AR_accessible) 3640 return true; 3641 3642 // -- a [virtual base class] B that cannot be [copied] because overload 3643 // resolution, as applied to B's [copy] constructor, results in an 3644 // ambiguity or a function that is deleted or inaccessible from the 3645 // defaulted constructor 3646 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3647 if (!BaseCtor || BaseCtor->isDeleted()) 3648 return true; 3649 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3650 AR_accessible) 3651 return true; 3652 } 3653 3654 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3655 FE = RD->field_end(); 3656 FI != FE; ++FI) { 3657 QualType FieldType = Context.getBaseElementType(FI->getType()); 3658 3659 // -- for a copy constructor, a non-static data member of rvalue reference 3660 // type 3661 if (FieldType->isRValueReferenceType()) 3662 return true; 3663 3664 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3665 3666 if (FieldRecord) { 3667 // This is an anonymous union 3668 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3669 // Anonymous unions inside unions do not variant members create 3670 if (!Union) { 3671 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3672 UE = FieldRecord->field_end(); 3673 UI != UE; ++UI) { 3674 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3675 CXXRecordDecl *UnionFieldRecord = 3676 UnionFieldType->getAsCXXRecordDecl(); 3677 3678 // -- a variant member with a non-trivial [copy] constructor and X 3679 // is a union-like class 3680 if (UnionFieldRecord && 3681 !UnionFieldRecord->hasTrivialCopyConstructor()) 3682 return true; 3683 } 3684 } 3685 3686 // Don't try to initalize an anonymous union 3687 continue; 3688 } else { 3689 // -- a variant member with a non-trivial [copy] constructor and X is a 3690 // union-like class 3691 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3692 return true; 3693 3694 // -- any [non-static data member] of a type with a destructor that is 3695 // deleted or inaccessible from the defaulted constructor 3696 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3697 if (FieldDtor->isDeleted()) 3698 return true; 3699 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3700 AR_accessible) 3701 return true; 3702 } 3703 3704 // -- a [non-static data member of class type (or array thereof)] B that 3705 // cannot be [copied] because overload resolution, as applied to B's 3706 // [copy] constructor, results in an ambiguity or a function that is 3707 // deleted or inaccessible from the defaulted constructor 3708 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3709 ArgQuals); 3710 if (!FieldCtor || FieldCtor->isDeleted()) 3711 return true; 3712 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3713 PDiag()) != AR_accessible) 3714 return true; 3715 } 3716 } 3717 3718 return false; 3719} 3720 3721bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3722 CXXRecordDecl *RD = MD->getParent(); 3723 assert(!RD->isDependentType() && "do deletion after instantiation"); 3724 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3725 return false; 3726 3727 SourceLocation Loc = MD->getLocation(); 3728 3729 // Do access control from the constructor 3730 ContextRAII MethodContext(*this, MD); 3731 3732 bool Union = RD->isUnion(); 3733 3734 unsigned ArgQuals = 3735 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3736 Qualifiers::Const : 0; 3737 3738 // We do this because we should never actually use an anonymous 3739 // union's constructor. 3740 if (Union && RD->isAnonymousStructOrUnion()) 3741 return false; 3742 3743 // FIXME: We should put some diagnostic logic right into this function. 3744 3745 // C++0x [class.copy]/11 3746 // A defaulted [copy] assignment operator for class X is defined as deleted 3747 // if X has: 3748 3749 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3750 BE = RD->bases_end(); 3751 BI != BE; ++BI) { 3752 // We'll handle this one later 3753 if (BI->isVirtual()) 3754 continue; 3755 3756 QualType BaseType = BI->getType(); 3757 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3758 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3759 3760 // -- a [direct base class] B that cannot be [copied] because overload 3761 // resolution, as applied to B's [copy] assignment operator, results in 3762 // an ambiguity or a function that is deleted or inaccessible from the 3763 // assignment operator 3764 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3765 0); 3766 if (!CopyOper || CopyOper->isDeleted()) 3767 return true; 3768 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3769 return true; 3770 } 3771 3772 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3773 BE = RD->vbases_end(); 3774 BI != BE; ++BI) { 3775 QualType BaseType = BI->getType(); 3776 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3777 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3778 3779 // -- a [virtual base class] B that cannot be [copied] because overload 3780 // resolution, as applied to B's [copy] assignment operator, results in 3781 // an ambiguity or a function that is deleted or inaccessible from the 3782 // assignment operator 3783 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3784 0); 3785 if (!CopyOper || CopyOper->isDeleted()) 3786 return true; 3787 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3788 return true; 3789 } 3790 3791 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3792 FE = RD->field_end(); 3793 FI != FE; ++FI) { 3794 QualType FieldType = Context.getBaseElementType(FI->getType()); 3795 3796 // -- a non-static data member of reference type 3797 if (FieldType->isReferenceType()) 3798 return true; 3799 3800 // -- a non-static data member of const non-class type (or array thereof) 3801 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3802 return true; 3803 3804 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3805 3806 if (FieldRecord) { 3807 // This is an anonymous union 3808 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3809 // Anonymous unions inside unions do not variant members create 3810 if (!Union) { 3811 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3812 UE = FieldRecord->field_end(); 3813 UI != UE; ++UI) { 3814 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3815 CXXRecordDecl *UnionFieldRecord = 3816 UnionFieldType->getAsCXXRecordDecl(); 3817 3818 // -- a variant member with a non-trivial [copy] assignment operator 3819 // and X is a union-like class 3820 if (UnionFieldRecord && 3821 !UnionFieldRecord->hasTrivialCopyAssignment()) 3822 return true; 3823 } 3824 } 3825 3826 // Don't try to initalize an anonymous union 3827 continue; 3828 // -- a variant member with a non-trivial [copy] assignment operator 3829 // and X is a union-like class 3830 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3831 return true; 3832 } 3833 3834 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 3835 false, 0); 3836 if (!CopyOper || CopyOper->isDeleted()) 3837 return false; 3838 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3839 return false; 3840 } 3841 } 3842 3843 return false; 3844} 3845 3846bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3847 CXXRecordDecl *RD = DD->getParent(); 3848 assert(!RD->isDependentType() && "do deletion after instantiation"); 3849 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3850 return false; 3851 3852 SourceLocation Loc = DD->getLocation(); 3853 3854 // Do access control from the destructor 3855 ContextRAII CtorContext(*this, DD); 3856 3857 bool Union = RD->isUnion(); 3858 3859 // We do this because we should never actually use an anonymous 3860 // union's destructor. 3861 if (Union && RD->isAnonymousStructOrUnion()) 3862 return false; 3863 3864 // C++0x [class.dtor]p5 3865 // A defaulted destructor for a class X is defined as deleted if: 3866 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3867 BE = RD->bases_end(); 3868 BI != BE; ++BI) { 3869 // We'll handle this one later 3870 if (BI->isVirtual()) 3871 continue; 3872 3873 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3874 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3875 assert(BaseDtor && "base has no destructor"); 3876 3877 // -- any direct or virtual base class has a deleted destructor or 3878 // a destructor that is inaccessible from the defaulted destructor 3879 if (BaseDtor->isDeleted()) 3880 return true; 3881 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3882 AR_accessible) 3883 return true; 3884 } 3885 3886 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3887 BE = RD->vbases_end(); 3888 BI != BE; ++BI) { 3889 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3890 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3891 assert(BaseDtor && "base has no destructor"); 3892 3893 // -- any direct or virtual base class has a deleted destructor or 3894 // a destructor that is inaccessible from the defaulted destructor 3895 if (BaseDtor->isDeleted()) 3896 return true; 3897 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3898 AR_accessible) 3899 return true; 3900 } 3901 3902 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3903 FE = RD->field_end(); 3904 FI != FE; ++FI) { 3905 QualType FieldType = Context.getBaseElementType(FI->getType()); 3906 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3907 if (FieldRecord) { 3908 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3909 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3910 UE = FieldRecord->field_end(); 3911 UI != UE; ++UI) { 3912 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3913 CXXRecordDecl *UnionFieldRecord = 3914 UnionFieldType->getAsCXXRecordDecl(); 3915 3916 // -- X is a union-like class that has a variant member with a non- 3917 // trivial destructor. 3918 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3919 return true; 3920 } 3921 // Technically we are supposed to do this next check unconditionally. 3922 // But that makes absolutely no sense. 3923 } else { 3924 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3925 3926 // -- any of the non-static data members has class type M (or array 3927 // thereof) and M has a deleted destructor or a destructor that is 3928 // inaccessible from the defaulted destructor 3929 if (FieldDtor->isDeleted()) 3930 return true; 3931 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3932 AR_accessible) 3933 return true; 3934 3935 // -- X is a union-like class that has a variant member with a non- 3936 // trivial destructor. 3937 if (Union && !FieldDtor->isTrivial()) 3938 return true; 3939 } 3940 } 3941 } 3942 3943 if (DD->isVirtual()) { 3944 FunctionDecl *OperatorDelete = 0; 3945 DeclarationName Name = 3946 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3947 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3948 false)) 3949 return true; 3950 } 3951 3952 3953 return false; 3954} 3955 3956/// \brief Data used with FindHiddenVirtualMethod 3957namespace { 3958 struct FindHiddenVirtualMethodData { 3959 Sema *S; 3960 CXXMethodDecl *Method; 3961 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3962 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3963 }; 3964} 3965 3966/// \brief Member lookup function that determines whether a given C++ 3967/// method overloads virtual methods in a base class without overriding any, 3968/// to be used with CXXRecordDecl::lookupInBases(). 3969static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3970 CXXBasePath &Path, 3971 void *UserData) { 3972 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3973 3974 FindHiddenVirtualMethodData &Data 3975 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3976 3977 DeclarationName Name = Data.Method->getDeclName(); 3978 assert(Name.getNameKind() == DeclarationName::Identifier); 3979 3980 bool foundSameNameMethod = false; 3981 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3982 for (Path.Decls = BaseRecord->lookup(Name); 3983 Path.Decls.first != Path.Decls.second; 3984 ++Path.Decls.first) { 3985 NamedDecl *D = *Path.Decls.first; 3986 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3987 MD = MD->getCanonicalDecl(); 3988 foundSameNameMethod = true; 3989 // Interested only in hidden virtual methods. 3990 if (!MD->isVirtual()) 3991 continue; 3992 // If the method we are checking overrides a method from its base 3993 // don't warn about the other overloaded methods. 3994 if (!Data.S->IsOverload(Data.Method, MD, false)) 3995 return true; 3996 // Collect the overload only if its hidden. 3997 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3998 overloadedMethods.push_back(MD); 3999 } 4000 } 4001 4002 if (foundSameNameMethod) 4003 Data.OverloadedMethods.append(overloadedMethods.begin(), 4004 overloadedMethods.end()); 4005 return foundSameNameMethod; 4006} 4007 4008/// \brief See if a method overloads virtual methods in a base class without 4009/// overriding any. 4010void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4011 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4012 MD->getLocation()) == Diagnostic::Ignored) 4013 return; 4014 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4015 return; 4016 4017 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4018 /*bool RecordPaths=*/false, 4019 /*bool DetectVirtual=*/false); 4020 FindHiddenVirtualMethodData Data; 4021 Data.Method = MD; 4022 Data.S = this; 4023 4024 // Keep the base methods that were overriden or introduced in the subclass 4025 // by 'using' in a set. A base method not in this set is hidden. 4026 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4027 res.first != res.second; ++res.first) { 4028 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4029 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4030 E = MD->end_overridden_methods(); 4031 I != E; ++I) 4032 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4033 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4034 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4035 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4036 } 4037 4038 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4039 !Data.OverloadedMethods.empty()) { 4040 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4041 << MD << (Data.OverloadedMethods.size() > 1); 4042 4043 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4044 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4045 Diag(overloadedMD->getLocation(), 4046 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4047 } 4048 } 4049} 4050 4051void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4052 Decl *TagDecl, 4053 SourceLocation LBrac, 4054 SourceLocation RBrac, 4055 AttributeList *AttrList) { 4056 if (!TagDecl) 4057 return; 4058 4059 AdjustDeclIfTemplate(TagDecl); 4060 4061 ActOnFields(S, RLoc, TagDecl, 4062 // strict aliasing violation! 4063 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4064 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4065 4066 CheckCompletedCXXClass( 4067 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4068} 4069 4070/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4071/// special functions, such as the default constructor, copy 4072/// constructor, or destructor, to the given C++ class (C++ 4073/// [special]p1). This routine can only be executed just before the 4074/// definition of the class is complete. 4075void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4076 if (!ClassDecl->hasUserDeclaredConstructor()) 4077 ++ASTContext::NumImplicitDefaultConstructors; 4078 4079 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4080 ++ASTContext::NumImplicitCopyConstructors; 4081 4082 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4083 ++ASTContext::NumImplicitCopyAssignmentOperators; 4084 4085 // If we have a dynamic class, then the copy assignment operator may be 4086 // virtual, so we have to declare it immediately. This ensures that, e.g., 4087 // it shows up in the right place in the vtable and that we diagnose 4088 // problems with the implicit exception specification. 4089 if (ClassDecl->isDynamicClass()) 4090 DeclareImplicitCopyAssignment(ClassDecl); 4091 } 4092 4093 if (!ClassDecl->hasUserDeclaredDestructor()) { 4094 ++ASTContext::NumImplicitDestructors; 4095 4096 // If we have a dynamic class, then the destructor may be virtual, so we 4097 // have to declare the destructor immediately. This ensures that, e.g., it 4098 // shows up in the right place in the vtable and that we diagnose problems 4099 // with the implicit exception specification. 4100 if (ClassDecl->isDynamicClass()) 4101 DeclareImplicitDestructor(ClassDecl); 4102 } 4103} 4104 4105void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4106 if (!D) 4107 return; 4108 4109 int NumParamList = D->getNumTemplateParameterLists(); 4110 for (int i = 0; i < NumParamList; i++) { 4111 TemplateParameterList* Params = D->getTemplateParameterList(i); 4112 for (TemplateParameterList::iterator Param = Params->begin(), 4113 ParamEnd = Params->end(); 4114 Param != ParamEnd; ++Param) { 4115 NamedDecl *Named = cast<NamedDecl>(*Param); 4116 if (Named->getDeclName()) { 4117 S->AddDecl(Named); 4118 IdResolver.AddDecl(Named); 4119 } 4120 } 4121 } 4122} 4123 4124void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4125 if (!D) 4126 return; 4127 4128 TemplateParameterList *Params = 0; 4129 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4130 Params = Template->getTemplateParameters(); 4131 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4132 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4133 Params = PartialSpec->getTemplateParameters(); 4134 else 4135 return; 4136 4137 for (TemplateParameterList::iterator Param = Params->begin(), 4138 ParamEnd = Params->end(); 4139 Param != ParamEnd; ++Param) { 4140 NamedDecl *Named = cast<NamedDecl>(*Param); 4141 if (Named->getDeclName()) { 4142 S->AddDecl(Named); 4143 IdResolver.AddDecl(Named); 4144 } 4145 } 4146} 4147 4148void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4149 if (!RecordD) return; 4150 AdjustDeclIfTemplate(RecordD); 4151 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4152 PushDeclContext(S, Record); 4153} 4154 4155void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4156 if (!RecordD) return; 4157 PopDeclContext(); 4158} 4159 4160/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4161/// parsing a top-level (non-nested) C++ class, and we are now 4162/// parsing those parts of the given Method declaration that could 4163/// not be parsed earlier (C++ [class.mem]p2), such as default 4164/// arguments. This action should enter the scope of the given 4165/// Method declaration as if we had just parsed the qualified method 4166/// name. However, it should not bring the parameters into scope; 4167/// that will be performed by ActOnDelayedCXXMethodParameter. 4168void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4169} 4170 4171/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4172/// C++ method declaration. We're (re-)introducing the given 4173/// function parameter into scope for use in parsing later parts of 4174/// the method declaration. For example, we could see an 4175/// ActOnParamDefaultArgument event for this parameter. 4176void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4177 if (!ParamD) 4178 return; 4179 4180 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4181 4182 // If this parameter has an unparsed default argument, clear it out 4183 // to make way for the parsed default argument. 4184 if (Param->hasUnparsedDefaultArg()) 4185 Param->setDefaultArg(0); 4186 4187 S->AddDecl(Param); 4188 if (Param->getDeclName()) 4189 IdResolver.AddDecl(Param); 4190} 4191 4192/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4193/// processing the delayed method declaration for Method. The method 4194/// declaration is now considered finished. There may be a separate 4195/// ActOnStartOfFunctionDef action later (not necessarily 4196/// immediately!) for this method, if it was also defined inside the 4197/// class body. 4198void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4199 if (!MethodD) 4200 return; 4201 4202 AdjustDeclIfTemplate(MethodD); 4203 4204 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4205 4206 // Now that we have our default arguments, check the constructor 4207 // again. It could produce additional diagnostics or affect whether 4208 // the class has implicitly-declared destructors, among other 4209 // things. 4210 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4211 CheckConstructor(Constructor); 4212 4213 // Check the default arguments, which we may have added. 4214 if (!Method->isInvalidDecl()) 4215 CheckCXXDefaultArguments(Method); 4216} 4217 4218/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4219/// the well-formedness of the constructor declarator @p D with type @p 4220/// R. If there are any errors in the declarator, this routine will 4221/// emit diagnostics and set the invalid bit to true. In any case, the type 4222/// will be updated to reflect a well-formed type for the constructor and 4223/// returned. 4224QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4225 StorageClass &SC) { 4226 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4227 4228 // C++ [class.ctor]p3: 4229 // A constructor shall not be virtual (10.3) or static (9.4). A 4230 // constructor can be invoked for a const, volatile or const 4231 // volatile object. A constructor shall not be declared const, 4232 // volatile, or const volatile (9.3.2). 4233 if (isVirtual) { 4234 if (!D.isInvalidType()) 4235 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4236 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4237 << SourceRange(D.getIdentifierLoc()); 4238 D.setInvalidType(); 4239 } 4240 if (SC == SC_Static) { 4241 if (!D.isInvalidType()) 4242 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4243 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4244 << SourceRange(D.getIdentifierLoc()); 4245 D.setInvalidType(); 4246 SC = SC_None; 4247 } 4248 4249 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4250 if (FTI.TypeQuals != 0) { 4251 if (FTI.TypeQuals & Qualifiers::Const) 4252 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4253 << "const" << SourceRange(D.getIdentifierLoc()); 4254 if (FTI.TypeQuals & Qualifiers::Volatile) 4255 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4256 << "volatile" << SourceRange(D.getIdentifierLoc()); 4257 if (FTI.TypeQuals & Qualifiers::Restrict) 4258 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4259 << "restrict" << SourceRange(D.getIdentifierLoc()); 4260 D.setInvalidType(); 4261 } 4262 4263 // C++0x [class.ctor]p4: 4264 // A constructor shall not be declared with a ref-qualifier. 4265 if (FTI.hasRefQualifier()) { 4266 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4267 << FTI.RefQualifierIsLValueRef 4268 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4269 D.setInvalidType(); 4270 } 4271 4272 // Rebuild the function type "R" without any type qualifiers (in 4273 // case any of the errors above fired) and with "void" as the 4274 // return type, since constructors don't have return types. 4275 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4276 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4277 return R; 4278 4279 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4280 EPI.TypeQuals = 0; 4281 EPI.RefQualifier = RQ_None; 4282 4283 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4284 Proto->getNumArgs(), EPI); 4285} 4286 4287/// CheckConstructor - Checks a fully-formed constructor for 4288/// well-formedness, issuing any diagnostics required. Returns true if 4289/// the constructor declarator is invalid. 4290void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4291 CXXRecordDecl *ClassDecl 4292 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4293 if (!ClassDecl) 4294 return Constructor->setInvalidDecl(); 4295 4296 // C++ [class.copy]p3: 4297 // A declaration of a constructor for a class X is ill-formed if 4298 // its first parameter is of type (optionally cv-qualified) X and 4299 // either there are no other parameters or else all other 4300 // parameters have default arguments. 4301 if (!Constructor->isInvalidDecl() && 4302 ((Constructor->getNumParams() == 1) || 4303 (Constructor->getNumParams() > 1 && 4304 Constructor->getParamDecl(1)->hasDefaultArg())) && 4305 Constructor->getTemplateSpecializationKind() 4306 != TSK_ImplicitInstantiation) { 4307 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4308 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4309 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4310 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4311 const char *ConstRef 4312 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4313 : " const &"; 4314 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4315 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4316 4317 // FIXME: Rather that making the constructor invalid, we should endeavor 4318 // to fix the type. 4319 Constructor->setInvalidDecl(); 4320 } 4321 } 4322} 4323 4324/// CheckDestructor - Checks a fully-formed destructor definition for 4325/// well-formedness, issuing any diagnostics required. Returns true 4326/// on error. 4327bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4328 CXXRecordDecl *RD = Destructor->getParent(); 4329 4330 if (Destructor->isVirtual()) { 4331 SourceLocation Loc; 4332 4333 if (!Destructor->isImplicit()) 4334 Loc = Destructor->getLocation(); 4335 else 4336 Loc = RD->getLocation(); 4337 4338 // If we have a virtual destructor, look up the deallocation function 4339 FunctionDecl *OperatorDelete = 0; 4340 DeclarationName Name = 4341 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4342 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4343 return true; 4344 4345 MarkDeclarationReferenced(Loc, OperatorDelete); 4346 4347 Destructor->setOperatorDelete(OperatorDelete); 4348 } 4349 4350 return false; 4351} 4352 4353static inline bool 4354FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4355 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4356 FTI.ArgInfo[0].Param && 4357 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4358} 4359 4360/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4361/// the well-formednes of the destructor declarator @p D with type @p 4362/// R. If there are any errors in the declarator, this routine will 4363/// emit diagnostics and set the declarator to invalid. Even if this happens, 4364/// will be updated to reflect a well-formed type for the destructor and 4365/// returned. 4366QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4367 StorageClass& SC) { 4368 // C++ [class.dtor]p1: 4369 // [...] A typedef-name that names a class is a class-name 4370 // (7.1.3); however, a typedef-name that names a class shall not 4371 // be used as the identifier in the declarator for a destructor 4372 // declaration. 4373 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4374 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4375 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4376 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4377 else if (const TemplateSpecializationType *TST = 4378 DeclaratorType->getAs<TemplateSpecializationType>()) 4379 if (TST->isTypeAlias()) 4380 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4381 << DeclaratorType << 1; 4382 4383 // C++ [class.dtor]p2: 4384 // A destructor is used to destroy objects of its class type. A 4385 // destructor takes no parameters, and no return type can be 4386 // specified for it (not even void). The address of a destructor 4387 // shall not be taken. A destructor shall not be static. A 4388 // destructor can be invoked for a const, volatile or const 4389 // volatile object. A destructor shall not be declared const, 4390 // volatile or const volatile (9.3.2). 4391 if (SC == SC_Static) { 4392 if (!D.isInvalidType()) 4393 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4394 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4395 << SourceRange(D.getIdentifierLoc()) 4396 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4397 4398 SC = SC_None; 4399 } 4400 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4401 // Destructors don't have return types, but the parser will 4402 // happily parse something like: 4403 // 4404 // class X { 4405 // float ~X(); 4406 // }; 4407 // 4408 // The return type will be eliminated later. 4409 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4410 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4411 << SourceRange(D.getIdentifierLoc()); 4412 } 4413 4414 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4415 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4416 if (FTI.TypeQuals & Qualifiers::Const) 4417 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4418 << "const" << SourceRange(D.getIdentifierLoc()); 4419 if (FTI.TypeQuals & Qualifiers::Volatile) 4420 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4421 << "volatile" << SourceRange(D.getIdentifierLoc()); 4422 if (FTI.TypeQuals & Qualifiers::Restrict) 4423 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4424 << "restrict" << SourceRange(D.getIdentifierLoc()); 4425 D.setInvalidType(); 4426 } 4427 4428 // C++0x [class.dtor]p2: 4429 // A destructor shall not be declared with a ref-qualifier. 4430 if (FTI.hasRefQualifier()) { 4431 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4432 << FTI.RefQualifierIsLValueRef 4433 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4434 D.setInvalidType(); 4435 } 4436 4437 // Make sure we don't have any parameters. 4438 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4439 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4440 4441 // Delete the parameters. 4442 FTI.freeArgs(); 4443 D.setInvalidType(); 4444 } 4445 4446 // Make sure the destructor isn't variadic. 4447 if (FTI.isVariadic) { 4448 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4449 D.setInvalidType(); 4450 } 4451 4452 // Rebuild the function type "R" without any type qualifiers or 4453 // parameters (in case any of the errors above fired) and with 4454 // "void" as the return type, since destructors don't have return 4455 // types. 4456 if (!D.isInvalidType()) 4457 return R; 4458 4459 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4460 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4461 EPI.Variadic = false; 4462 EPI.TypeQuals = 0; 4463 EPI.RefQualifier = RQ_None; 4464 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4465} 4466 4467/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4468/// well-formednes of the conversion function declarator @p D with 4469/// type @p R. If there are any errors in the declarator, this routine 4470/// will emit diagnostics and return true. Otherwise, it will return 4471/// false. Either way, the type @p R will be updated to reflect a 4472/// well-formed type for the conversion operator. 4473void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4474 StorageClass& SC) { 4475 // C++ [class.conv.fct]p1: 4476 // Neither parameter types nor return type can be specified. The 4477 // type of a conversion function (8.3.5) is "function taking no 4478 // parameter returning conversion-type-id." 4479 if (SC == SC_Static) { 4480 if (!D.isInvalidType()) 4481 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4482 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4483 << SourceRange(D.getIdentifierLoc()); 4484 D.setInvalidType(); 4485 SC = SC_None; 4486 } 4487 4488 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4489 4490 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4491 // Conversion functions don't have return types, but the parser will 4492 // happily parse something like: 4493 // 4494 // class X { 4495 // float operator bool(); 4496 // }; 4497 // 4498 // The return type will be changed later anyway. 4499 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4500 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4501 << SourceRange(D.getIdentifierLoc()); 4502 D.setInvalidType(); 4503 } 4504 4505 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4506 4507 // Make sure we don't have any parameters. 4508 if (Proto->getNumArgs() > 0) { 4509 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4510 4511 // Delete the parameters. 4512 D.getFunctionTypeInfo().freeArgs(); 4513 D.setInvalidType(); 4514 } else if (Proto->isVariadic()) { 4515 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4516 D.setInvalidType(); 4517 } 4518 4519 // Diagnose "&operator bool()" and other such nonsense. This 4520 // is actually a gcc extension which we don't support. 4521 if (Proto->getResultType() != ConvType) { 4522 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4523 << Proto->getResultType(); 4524 D.setInvalidType(); 4525 ConvType = Proto->getResultType(); 4526 } 4527 4528 // C++ [class.conv.fct]p4: 4529 // The conversion-type-id shall not represent a function type nor 4530 // an array type. 4531 if (ConvType->isArrayType()) { 4532 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4533 ConvType = Context.getPointerType(ConvType); 4534 D.setInvalidType(); 4535 } else if (ConvType->isFunctionType()) { 4536 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4537 ConvType = Context.getPointerType(ConvType); 4538 D.setInvalidType(); 4539 } 4540 4541 // Rebuild the function type "R" without any parameters (in case any 4542 // of the errors above fired) and with the conversion type as the 4543 // return type. 4544 if (D.isInvalidType()) 4545 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4546 4547 // C++0x explicit conversion operators. 4548 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4549 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4550 diag::warn_explicit_conversion_functions) 4551 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4552} 4553 4554/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4555/// the declaration of the given C++ conversion function. This routine 4556/// is responsible for recording the conversion function in the C++ 4557/// class, if possible. 4558Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4559 assert(Conversion && "Expected to receive a conversion function declaration"); 4560 4561 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4562 4563 // Make sure we aren't redeclaring the conversion function. 4564 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4565 4566 // C++ [class.conv.fct]p1: 4567 // [...] A conversion function is never used to convert a 4568 // (possibly cv-qualified) object to the (possibly cv-qualified) 4569 // same object type (or a reference to it), to a (possibly 4570 // cv-qualified) base class of that type (or a reference to it), 4571 // or to (possibly cv-qualified) void. 4572 // FIXME: Suppress this warning if the conversion function ends up being a 4573 // virtual function that overrides a virtual function in a base class. 4574 QualType ClassType 4575 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4576 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4577 ConvType = ConvTypeRef->getPointeeType(); 4578 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4579 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4580 /* Suppress diagnostics for instantiations. */; 4581 else if (ConvType->isRecordType()) { 4582 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4583 if (ConvType == ClassType) 4584 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4585 << ClassType; 4586 else if (IsDerivedFrom(ClassType, ConvType)) 4587 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4588 << ClassType << ConvType; 4589 } else if (ConvType->isVoidType()) { 4590 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4591 << ClassType << ConvType; 4592 } 4593 4594 if (FunctionTemplateDecl *ConversionTemplate 4595 = Conversion->getDescribedFunctionTemplate()) 4596 return ConversionTemplate; 4597 4598 return Conversion; 4599} 4600 4601//===----------------------------------------------------------------------===// 4602// Namespace Handling 4603//===----------------------------------------------------------------------===// 4604 4605 4606 4607/// ActOnStartNamespaceDef - This is called at the start of a namespace 4608/// definition. 4609Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4610 SourceLocation InlineLoc, 4611 SourceLocation NamespaceLoc, 4612 SourceLocation IdentLoc, 4613 IdentifierInfo *II, 4614 SourceLocation LBrace, 4615 AttributeList *AttrList) { 4616 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4617 // For anonymous namespace, take the location of the left brace. 4618 SourceLocation Loc = II ? IdentLoc : LBrace; 4619 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4620 StartLoc, Loc, II); 4621 Namespc->setInline(InlineLoc.isValid()); 4622 4623 Scope *DeclRegionScope = NamespcScope->getParent(); 4624 4625 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4626 4627 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4628 PushNamespaceVisibilityAttr(Attr); 4629 4630 if (II) { 4631 // C++ [namespace.def]p2: 4632 // The identifier in an original-namespace-definition shall not 4633 // have been previously defined in the declarative region in 4634 // which the original-namespace-definition appears. The 4635 // identifier in an original-namespace-definition is the name of 4636 // the namespace. Subsequently in that declarative region, it is 4637 // treated as an original-namespace-name. 4638 // 4639 // Since namespace names are unique in their scope, and we don't 4640 // look through using directives, just look for any ordinary names. 4641 4642 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4643 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4644 Decl::IDNS_Namespace; 4645 NamedDecl *PrevDecl = 0; 4646 for (DeclContext::lookup_result R 4647 = CurContext->getRedeclContext()->lookup(II); 4648 R.first != R.second; ++R.first) { 4649 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4650 PrevDecl = *R.first; 4651 break; 4652 } 4653 } 4654 4655 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4656 // This is an extended namespace definition. 4657 if (Namespc->isInline() != OrigNS->isInline()) { 4658 // inline-ness must match 4659 if (OrigNS->isInline()) { 4660 // The user probably just forgot the 'inline', so suggest that it 4661 // be added back. 4662 Diag(Namespc->getLocation(), 4663 diag::warn_inline_namespace_reopened_noninline) 4664 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4665 } else { 4666 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4667 << Namespc->isInline(); 4668 } 4669 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4670 4671 // Recover by ignoring the new namespace's inline status. 4672 Namespc->setInline(OrigNS->isInline()); 4673 } 4674 4675 // Attach this namespace decl to the chain of extended namespace 4676 // definitions. 4677 OrigNS->setNextNamespace(Namespc); 4678 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4679 4680 // Remove the previous declaration from the scope. 4681 if (DeclRegionScope->isDeclScope(OrigNS)) { 4682 IdResolver.RemoveDecl(OrigNS); 4683 DeclRegionScope->RemoveDecl(OrigNS); 4684 } 4685 } else if (PrevDecl) { 4686 // This is an invalid name redefinition. 4687 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4688 << Namespc->getDeclName(); 4689 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4690 Namespc->setInvalidDecl(); 4691 // Continue on to push Namespc as current DeclContext and return it. 4692 } else if (II->isStr("std") && 4693 CurContext->getRedeclContext()->isTranslationUnit()) { 4694 // This is the first "real" definition of the namespace "std", so update 4695 // our cache of the "std" namespace to point at this definition. 4696 if (NamespaceDecl *StdNS = getStdNamespace()) { 4697 // We had already defined a dummy namespace "std". Link this new 4698 // namespace definition to the dummy namespace "std". 4699 StdNS->setNextNamespace(Namespc); 4700 StdNS->setLocation(IdentLoc); 4701 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4702 } 4703 4704 // Make our StdNamespace cache point at the first real definition of the 4705 // "std" namespace. 4706 StdNamespace = Namespc; 4707 4708 // Add this instance of "std" to the set of known namespaces 4709 KnownNamespaces[Namespc] = false; 4710 } else if (!Namespc->isInline()) { 4711 // Since this is an "original" namespace, add it to the known set of 4712 // namespaces if it is not an inline namespace. 4713 KnownNamespaces[Namespc] = false; 4714 } 4715 4716 PushOnScopeChains(Namespc, DeclRegionScope); 4717 } else { 4718 // Anonymous namespaces. 4719 assert(Namespc->isAnonymousNamespace()); 4720 4721 // Link the anonymous namespace into its parent. 4722 NamespaceDecl *PrevDecl; 4723 DeclContext *Parent = CurContext->getRedeclContext(); 4724 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4725 PrevDecl = TU->getAnonymousNamespace(); 4726 TU->setAnonymousNamespace(Namespc); 4727 } else { 4728 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4729 PrevDecl = ND->getAnonymousNamespace(); 4730 ND->setAnonymousNamespace(Namespc); 4731 } 4732 4733 // Link the anonymous namespace with its previous declaration. 4734 if (PrevDecl) { 4735 assert(PrevDecl->isAnonymousNamespace()); 4736 assert(!PrevDecl->getNextNamespace()); 4737 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4738 PrevDecl->setNextNamespace(Namespc); 4739 4740 if (Namespc->isInline() != PrevDecl->isInline()) { 4741 // inline-ness must match 4742 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4743 << Namespc->isInline(); 4744 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4745 Namespc->setInvalidDecl(); 4746 // Recover by ignoring the new namespace's inline status. 4747 Namespc->setInline(PrevDecl->isInline()); 4748 } 4749 } 4750 4751 CurContext->addDecl(Namespc); 4752 4753 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4754 // behaves as if it were replaced by 4755 // namespace unique { /* empty body */ } 4756 // using namespace unique; 4757 // namespace unique { namespace-body } 4758 // where all occurrences of 'unique' in a translation unit are 4759 // replaced by the same identifier and this identifier differs 4760 // from all other identifiers in the entire program. 4761 4762 // We just create the namespace with an empty name and then add an 4763 // implicit using declaration, just like the standard suggests. 4764 // 4765 // CodeGen enforces the "universally unique" aspect by giving all 4766 // declarations semantically contained within an anonymous 4767 // namespace internal linkage. 4768 4769 if (!PrevDecl) { 4770 UsingDirectiveDecl* UD 4771 = UsingDirectiveDecl::Create(Context, CurContext, 4772 /* 'using' */ LBrace, 4773 /* 'namespace' */ SourceLocation(), 4774 /* qualifier */ NestedNameSpecifierLoc(), 4775 /* identifier */ SourceLocation(), 4776 Namespc, 4777 /* Ancestor */ CurContext); 4778 UD->setImplicit(); 4779 CurContext->addDecl(UD); 4780 } 4781 } 4782 4783 // Although we could have an invalid decl (i.e. the namespace name is a 4784 // redefinition), push it as current DeclContext and try to continue parsing. 4785 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4786 // for the namespace has the declarations that showed up in that particular 4787 // namespace definition. 4788 PushDeclContext(NamespcScope, Namespc); 4789 return Namespc; 4790} 4791 4792/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4793/// is a namespace alias, returns the namespace it points to. 4794static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4795 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4796 return AD->getNamespace(); 4797 return dyn_cast_or_null<NamespaceDecl>(D); 4798} 4799 4800/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4801/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4802void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4803 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4804 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4805 Namespc->setRBraceLoc(RBrace); 4806 PopDeclContext(); 4807 if (Namespc->hasAttr<VisibilityAttr>()) 4808 PopPragmaVisibility(); 4809} 4810 4811CXXRecordDecl *Sema::getStdBadAlloc() const { 4812 return cast_or_null<CXXRecordDecl>( 4813 StdBadAlloc.get(Context.getExternalSource())); 4814} 4815 4816NamespaceDecl *Sema::getStdNamespace() const { 4817 return cast_or_null<NamespaceDecl>( 4818 StdNamespace.get(Context.getExternalSource())); 4819} 4820 4821/// \brief Retrieve the special "std" namespace, which may require us to 4822/// implicitly define the namespace. 4823NamespaceDecl *Sema::getOrCreateStdNamespace() { 4824 if (!StdNamespace) { 4825 // The "std" namespace has not yet been defined, so build one implicitly. 4826 StdNamespace = NamespaceDecl::Create(Context, 4827 Context.getTranslationUnitDecl(), 4828 SourceLocation(), SourceLocation(), 4829 &PP.getIdentifierTable().get("std")); 4830 getStdNamespace()->setImplicit(true); 4831 } 4832 4833 return getStdNamespace(); 4834} 4835 4836/// \brief Determine whether a using statement is in a context where it will be 4837/// apply in all contexts. 4838static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4839 switch (CurContext->getDeclKind()) { 4840 case Decl::TranslationUnit: 4841 return true; 4842 case Decl::LinkageSpec: 4843 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4844 default: 4845 return false; 4846 } 4847} 4848 4849static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 4850 CXXScopeSpec &SS, 4851 SourceLocation IdentLoc, 4852 IdentifierInfo *Ident) { 4853 R.clear(); 4854 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 4855 R.getLookupKind(), Sc, &SS, NULL, 4856 false, S.CTC_NoKeywords, NULL)) { 4857 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 4858 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 4859 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 4860 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 4861 if (DeclContext *DC = S.computeDeclContext(SS, false)) 4862 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 4863 << Ident << DC << CorrectedQuotedStr << SS.getRange() 4864 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4865 else 4866 S.Diag(IdentLoc, diag::err_using_directive_suggest) 4867 << Ident << CorrectedQuotedStr 4868 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4869 4870 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 4871 diag::note_namespace_defined_here) << CorrectedQuotedStr; 4872 4873 Ident = Corrected.getCorrectionAsIdentifierInfo(); 4874 R.addDecl(Corrected.getCorrectionDecl()); 4875 return true; 4876 } 4877 R.setLookupName(Ident); 4878 } 4879 return false; 4880} 4881 4882Decl *Sema::ActOnUsingDirective(Scope *S, 4883 SourceLocation UsingLoc, 4884 SourceLocation NamespcLoc, 4885 CXXScopeSpec &SS, 4886 SourceLocation IdentLoc, 4887 IdentifierInfo *NamespcName, 4888 AttributeList *AttrList) { 4889 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4890 assert(NamespcName && "Invalid NamespcName."); 4891 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4892 4893 // This can only happen along a recovery path. 4894 while (S->getFlags() & Scope::TemplateParamScope) 4895 S = S->getParent(); 4896 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4897 4898 UsingDirectiveDecl *UDir = 0; 4899 NestedNameSpecifier *Qualifier = 0; 4900 if (SS.isSet()) 4901 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4902 4903 // Lookup namespace name. 4904 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4905 LookupParsedName(R, S, &SS); 4906 if (R.isAmbiguous()) 4907 return 0; 4908 4909 if (R.empty()) { 4910 R.clear(); 4911 // Allow "using namespace std;" or "using namespace ::std;" even if 4912 // "std" hasn't been defined yet, for GCC compatibility. 4913 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4914 NamespcName->isStr("std")) { 4915 Diag(IdentLoc, diag::ext_using_undefined_std); 4916 R.addDecl(getOrCreateStdNamespace()); 4917 R.resolveKind(); 4918 } 4919 // Otherwise, attempt typo correction. 4920 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 4921 } 4922 4923 if (!R.empty()) { 4924 NamedDecl *Named = R.getFoundDecl(); 4925 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4926 && "expected namespace decl"); 4927 // C++ [namespace.udir]p1: 4928 // A using-directive specifies that the names in the nominated 4929 // namespace can be used in the scope in which the 4930 // using-directive appears after the using-directive. During 4931 // unqualified name lookup (3.4.1), the names appear as if they 4932 // were declared in the nearest enclosing namespace which 4933 // contains both the using-directive and the nominated 4934 // namespace. [Note: in this context, "contains" means "contains 4935 // directly or indirectly". ] 4936 4937 // Find enclosing context containing both using-directive and 4938 // nominated namespace. 4939 NamespaceDecl *NS = getNamespaceDecl(Named); 4940 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4941 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4942 CommonAncestor = CommonAncestor->getParent(); 4943 4944 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4945 SS.getWithLocInContext(Context), 4946 IdentLoc, Named, CommonAncestor); 4947 4948 if (IsUsingDirectiveInToplevelContext(CurContext) && 4949 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4950 Diag(IdentLoc, diag::warn_using_directive_in_header); 4951 } 4952 4953 PushUsingDirective(S, UDir); 4954 } else { 4955 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4956 } 4957 4958 // FIXME: We ignore attributes for now. 4959 return UDir; 4960} 4961 4962void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4963 // If scope has associated entity, then using directive is at namespace 4964 // or translation unit scope. We add UsingDirectiveDecls, into 4965 // it's lookup structure. 4966 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4967 Ctx->addDecl(UDir); 4968 else 4969 // Otherwise it is block-sope. using-directives will affect lookup 4970 // only to the end of scope. 4971 S->PushUsingDirective(UDir); 4972} 4973 4974 4975Decl *Sema::ActOnUsingDeclaration(Scope *S, 4976 AccessSpecifier AS, 4977 bool HasUsingKeyword, 4978 SourceLocation UsingLoc, 4979 CXXScopeSpec &SS, 4980 UnqualifiedId &Name, 4981 AttributeList *AttrList, 4982 bool IsTypeName, 4983 SourceLocation TypenameLoc) { 4984 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4985 4986 switch (Name.getKind()) { 4987 case UnqualifiedId::IK_ImplicitSelfParam: 4988 case UnqualifiedId::IK_Identifier: 4989 case UnqualifiedId::IK_OperatorFunctionId: 4990 case UnqualifiedId::IK_LiteralOperatorId: 4991 case UnqualifiedId::IK_ConversionFunctionId: 4992 break; 4993 4994 case UnqualifiedId::IK_ConstructorName: 4995 case UnqualifiedId::IK_ConstructorTemplateId: 4996 // C++0x inherited constructors. 4997 if (getLangOptions().CPlusPlus0x) break; 4998 4999 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5000 << SS.getRange(); 5001 return 0; 5002 5003 case UnqualifiedId::IK_DestructorName: 5004 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5005 << SS.getRange(); 5006 return 0; 5007 5008 case UnqualifiedId::IK_TemplateId: 5009 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5010 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5011 return 0; 5012 } 5013 5014 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5015 DeclarationName TargetName = TargetNameInfo.getName(); 5016 if (!TargetName) 5017 return 0; 5018 5019 // Warn about using declarations. 5020 // TODO: store that the declaration was written without 'using' and 5021 // talk about access decls instead of using decls in the 5022 // diagnostics. 5023 if (!HasUsingKeyword) { 5024 UsingLoc = Name.getSourceRange().getBegin(); 5025 5026 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5027 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5028 } 5029 5030 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5031 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5032 return 0; 5033 5034 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5035 TargetNameInfo, AttrList, 5036 /* IsInstantiation */ false, 5037 IsTypeName, TypenameLoc); 5038 if (UD) 5039 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5040 5041 return UD; 5042} 5043 5044/// \brief Determine whether a using declaration considers the given 5045/// declarations as "equivalent", e.g., if they are redeclarations of 5046/// the same entity or are both typedefs of the same type. 5047static bool 5048IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5049 bool &SuppressRedeclaration) { 5050 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5051 SuppressRedeclaration = false; 5052 return true; 5053 } 5054 5055 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5056 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5057 SuppressRedeclaration = true; 5058 return Context.hasSameType(TD1->getUnderlyingType(), 5059 TD2->getUnderlyingType()); 5060 } 5061 5062 return false; 5063} 5064 5065 5066/// Determines whether to create a using shadow decl for a particular 5067/// decl, given the set of decls existing prior to this using lookup. 5068bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5069 const LookupResult &Previous) { 5070 // Diagnose finding a decl which is not from a base class of the 5071 // current class. We do this now because there are cases where this 5072 // function will silently decide not to build a shadow decl, which 5073 // will pre-empt further diagnostics. 5074 // 5075 // We don't need to do this in C++0x because we do the check once on 5076 // the qualifier. 5077 // 5078 // FIXME: diagnose the following if we care enough: 5079 // struct A { int foo; }; 5080 // struct B : A { using A::foo; }; 5081 // template <class T> struct C : A {}; 5082 // template <class T> struct D : C<T> { using B::foo; } // <--- 5083 // This is invalid (during instantiation) in C++03 because B::foo 5084 // resolves to the using decl in B, which is not a base class of D<T>. 5085 // We can't diagnose it immediately because C<T> is an unknown 5086 // specialization. The UsingShadowDecl in D<T> then points directly 5087 // to A::foo, which will look well-formed when we instantiate. 5088 // The right solution is to not collapse the shadow-decl chain. 5089 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5090 DeclContext *OrigDC = Orig->getDeclContext(); 5091 5092 // Handle enums and anonymous structs. 5093 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5094 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5095 while (OrigRec->isAnonymousStructOrUnion()) 5096 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5097 5098 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5099 if (OrigDC == CurContext) { 5100 Diag(Using->getLocation(), 5101 diag::err_using_decl_nested_name_specifier_is_current_class) 5102 << Using->getQualifierLoc().getSourceRange(); 5103 Diag(Orig->getLocation(), diag::note_using_decl_target); 5104 return true; 5105 } 5106 5107 Diag(Using->getQualifierLoc().getBeginLoc(), 5108 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5109 << Using->getQualifier() 5110 << cast<CXXRecordDecl>(CurContext) 5111 << Using->getQualifierLoc().getSourceRange(); 5112 Diag(Orig->getLocation(), diag::note_using_decl_target); 5113 return true; 5114 } 5115 } 5116 5117 if (Previous.empty()) return false; 5118 5119 NamedDecl *Target = Orig; 5120 if (isa<UsingShadowDecl>(Target)) 5121 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5122 5123 // If the target happens to be one of the previous declarations, we 5124 // don't have a conflict. 5125 // 5126 // FIXME: but we might be increasing its access, in which case we 5127 // should redeclare it. 5128 NamedDecl *NonTag = 0, *Tag = 0; 5129 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5130 I != E; ++I) { 5131 NamedDecl *D = (*I)->getUnderlyingDecl(); 5132 bool Result; 5133 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5134 return Result; 5135 5136 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5137 } 5138 5139 if (Target->isFunctionOrFunctionTemplate()) { 5140 FunctionDecl *FD; 5141 if (isa<FunctionTemplateDecl>(Target)) 5142 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5143 else 5144 FD = cast<FunctionDecl>(Target); 5145 5146 NamedDecl *OldDecl = 0; 5147 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5148 case Ovl_Overload: 5149 return false; 5150 5151 case Ovl_NonFunction: 5152 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5153 break; 5154 5155 // We found a decl with the exact signature. 5156 case Ovl_Match: 5157 // If we're in a record, we want to hide the target, so we 5158 // return true (without a diagnostic) to tell the caller not to 5159 // build a shadow decl. 5160 if (CurContext->isRecord()) 5161 return true; 5162 5163 // If we're not in a record, this is an error. 5164 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5165 break; 5166 } 5167 5168 Diag(Target->getLocation(), diag::note_using_decl_target); 5169 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5170 return true; 5171 } 5172 5173 // Target is not a function. 5174 5175 if (isa<TagDecl>(Target)) { 5176 // No conflict between a tag and a non-tag. 5177 if (!Tag) return false; 5178 5179 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5180 Diag(Target->getLocation(), diag::note_using_decl_target); 5181 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5182 return true; 5183 } 5184 5185 // No conflict between a tag and a non-tag. 5186 if (!NonTag) return false; 5187 5188 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5189 Diag(Target->getLocation(), diag::note_using_decl_target); 5190 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5191 return true; 5192} 5193 5194/// Builds a shadow declaration corresponding to a 'using' declaration. 5195UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5196 UsingDecl *UD, 5197 NamedDecl *Orig) { 5198 5199 // If we resolved to another shadow declaration, just coalesce them. 5200 NamedDecl *Target = Orig; 5201 if (isa<UsingShadowDecl>(Target)) { 5202 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5203 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5204 } 5205 5206 UsingShadowDecl *Shadow 5207 = UsingShadowDecl::Create(Context, CurContext, 5208 UD->getLocation(), UD, Target); 5209 UD->addShadowDecl(Shadow); 5210 5211 Shadow->setAccess(UD->getAccess()); 5212 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5213 Shadow->setInvalidDecl(); 5214 5215 if (S) 5216 PushOnScopeChains(Shadow, S); 5217 else 5218 CurContext->addDecl(Shadow); 5219 5220 5221 return Shadow; 5222} 5223 5224/// Hides a using shadow declaration. This is required by the current 5225/// using-decl implementation when a resolvable using declaration in a 5226/// class is followed by a declaration which would hide or override 5227/// one or more of the using decl's targets; for example: 5228/// 5229/// struct Base { void foo(int); }; 5230/// struct Derived : Base { 5231/// using Base::foo; 5232/// void foo(int); 5233/// }; 5234/// 5235/// The governing language is C++03 [namespace.udecl]p12: 5236/// 5237/// When a using-declaration brings names from a base class into a 5238/// derived class scope, member functions in the derived class 5239/// override and/or hide member functions with the same name and 5240/// parameter types in a base class (rather than conflicting). 5241/// 5242/// There are two ways to implement this: 5243/// (1) optimistically create shadow decls when they're not hidden 5244/// by existing declarations, or 5245/// (2) don't create any shadow decls (or at least don't make them 5246/// visible) until we've fully parsed/instantiated the class. 5247/// The problem with (1) is that we might have to retroactively remove 5248/// a shadow decl, which requires several O(n) operations because the 5249/// decl structures are (very reasonably) not designed for removal. 5250/// (2) avoids this but is very fiddly and phase-dependent. 5251void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5252 if (Shadow->getDeclName().getNameKind() == 5253 DeclarationName::CXXConversionFunctionName) 5254 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5255 5256 // Remove it from the DeclContext... 5257 Shadow->getDeclContext()->removeDecl(Shadow); 5258 5259 // ...and the scope, if applicable... 5260 if (S) { 5261 S->RemoveDecl(Shadow); 5262 IdResolver.RemoveDecl(Shadow); 5263 } 5264 5265 // ...and the using decl. 5266 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5267 5268 // TODO: complain somehow if Shadow was used. It shouldn't 5269 // be possible for this to happen, because...? 5270} 5271 5272/// Builds a using declaration. 5273/// 5274/// \param IsInstantiation - Whether this call arises from an 5275/// instantiation of an unresolved using declaration. We treat 5276/// the lookup differently for these declarations. 5277NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5278 SourceLocation UsingLoc, 5279 CXXScopeSpec &SS, 5280 const DeclarationNameInfo &NameInfo, 5281 AttributeList *AttrList, 5282 bool IsInstantiation, 5283 bool IsTypeName, 5284 SourceLocation TypenameLoc) { 5285 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5286 SourceLocation IdentLoc = NameInfo.getLoc(); 5287 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5288 5289 // FIXME: We ignore attributes for now. 5290 5291 if (SS.isEmpty()) { 5292 Diag(IdentLoc, diag::err_using_requires_qualname); 5293 return 0; 5294 } 5295 5296 // Do the redeclaration lookup in the current scope. 5297 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5298 ForRedeclaration); 5299 Previous.setHideTags(false); 5300 if (S) { 5301 LookupName(Previous, S); 5302 5303 // It is really dumb that we have to do this. 5304 LookupResult::Filter F = Previous.makeFilter(); 5305 while (F.hasNext()) { 5306 NamedDecl *D = F.next(); 5307 if (!isDeclInScope(D, CurContext, S)) 5308 F.erase(); 5309 } 5310 F.done(); 5311 } else { 5312 assert(IsInstantiation && "no scope in non-instantiation"); 5313 assert(CurContext->isRecord() && "scope not record in instantiation"); 5314 LookupQualifiedName(Previous, CurContext); 5315 } 5316 5317 // Check for invalid redeclarations. 5318 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5319 return 0; 5320 5321 // Check for bad qualifiers. 5322 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5323 return 0; 5324 5325 DeclContext *LookupContext = computeDeclContext(SS); 5326 NamedDecl *D; 5327 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5328 if (!LookupContext) { 5329 if (IsTypeName) { 5330 // FIXME: not all declaration name kinds are legal here 5331 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5332 UsingLoc, TypenameLoc, 5333 QualifierLoc, 5334 IdentLoc, NameInfo.getName()); 5335 } else { 5336 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5337 QualifierLoc, NameInfo); 5338 } 5339 } else { 5340 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5341 NameInfo, IsTypeName); 5342 } 5343 D->setAccess(AS); 5344 CurContext->addDecl(D); 5345 5346 if (!LookupContext) return D; 5347 UsingDecl *UD = cast<UsingDecl>(D); 5348 5349 if (RequireCompleteDeclContext(SS, LookupContext)) { 5350 UD->setInvalidDecl(); 5351 return UD; 5352 } 5353 5354 // Constructor inheriting using decls get special treatment. 5355 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5356 if (CheckInheritedConstructorUsingDecl(UD)) 5357 UD->setInvalidDecl(); 5358 return UD; 5359 } 5360 5361 // Otherwise, look up the target name. 5362 5363 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5364 R.setUsingDeclaration(true); 5365 5366 // Unlike most lookups, we don't always want to hide tag 5367 // declarations: tag names are visible through the using declaration 5368 // even if hidden by ordinary names, *except* in a dependent context 5369 // where it's important for the sanity of two-phase lookup. 5370 if (!IsInstantiation) 5371 R.setHideTags(false); 5372 5373 LookupQualifiedName(R, LookupContext); 5374 5375 if (R.empty()) { 5376 Diag(IdentLoc, diag::err_no_member) 5377 << NameInfo.getName() << LookupContext << SS.getRange(); 5378 UD->setInvalidDecl(); 5379 return UD; 5380 } 5381 5382 if (R.isAmbiguous()) { 5383 UD->setInvalidDecl(); 5384 return UD; 5385 } 5386 5387 if (IsTypeName) { 5388 // If we asked for a typename and got a non-type decl, error out. 5389 if (!R.getAsSingle<TypeDecl>()) { 5390 Diag(IdentLoc, diag::err_using_typename_non_type); 5391 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5392 Diag((*I)->getUnderlyingDecl()->getLocation(), 5393 diag::note_using_decl_target); 5394 UD->setInvalidDecl(); 5395 return UD; 5396 } 5397 } else { 5398 // If we asked for a non-typename and we got a type, error out, 5399 // but only if this is an instantiation of an unresolved using 5400 // decl. Otherwise just silently find the type name. 5401 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5402 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5403 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5404 UD->setInvalidDecl(); 5405 return UD; 5406 } 5407 } 5408 5409 // C++0x N2914 [namespace.udecl]p6: 5410 // A using-declaration shall not name a namespace. 5411 if (R.getAsSingle<NamespaceDecl>()) { 5412 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5413 << SS.getRange(); 5414 UD->setInvalidDecl(); 5415 return UD; 5416 } 5417 5418 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5419 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5420 BuildUsingShadowDecl(S, UD, *I); 5421 } 5422 5423 return UD; 5424} 5425 5426/// Additional checks for a using declaration referring to a constructor name. 5427bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5428 if (UD->isTypeName()) { 5429 // FIXME: Cannot specify typename when specifying constructor 5430 return true; 5431 } 5432 5433 const Type *SourceType = UD->getQualifier()->getAsType(); 5434 assert(SourceType && 5435 "Using decl naming constructor doesn't have type in scope spec."); 5436 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5437 5438 // Check whether the named type is a direct base class. 5439 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5440 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5441 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5442 BaseIt != BaseE; ++BaseIt) { 5443 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5444 if (CanonicalSourceType == BaseType) 5445 break; 5446 } 5447 5448 if (BaseIt == BaseE) { 5449 // Did not find SourceType in the bases. 5450 Diag(UD->getUsingLocation(), 5451 diag::err_using_decl_constructor_not_in_direct_base) 5452 << UD->getNameInfo().getSourceRange() 5453 << QualType(SourceType, 0) << TargetClass; 5454 return true; 5455 } 5456 5457 BaseIt->setInheritConstructors(); 5458 5459 return false; 5460} 5461 5462/// Checks that the given using declaration is not an invalid 5463/// redeclaration. Note that this is checking only for the using decl 5464/// itself, not for any ill-formedness among the UsingShadowDecls. 5465bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5466 bool isTypeName, 5467 const CXXScopeSpec &SS, 5468 SourceLocation NameLoc, 5469 const LookupResult &Prev) { 5470 // C++03 [namespace.udecl]p8: 5471 // C++0x [namespace.udecl]p10: 5472 // A using-declaration is a declaration and can therefore be used 5473 // repeatedly where (and only where) multiple declarations are 5474 // allowed. 5475 // 5476 // That's in non-member contexts. 5477 if (!CurContext->getRedeclContext()->isRecord()) 5478 return false; 5479 5480 NestedNameSpecifier *Qual 5481 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5482 5483 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5484 NamedDecl *D = *I; 5485 5486 bool DTypename; 5487 NestedNameSpecifier *DQual; 5488 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5489 DTypename = UD->isTypeName(); 5490 DQual = UD->getQualifier(); 5491 } else if (UnresolvedUsingValueDecl *UD 5492 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5493 DTypename = false; 5494 DQual = UD->getQualifier(); 5495 } else if (UnresolvedUsingTypenameDecl *UD 5496 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5497 DTypename = true; 5498 DQual = UD->getQualifier(); 5499 } else continue; 5500 5501 // using decls differ if one says 'typename' and the other doesn't. 5502 // FIXME: non-dependent using decls? 5503 if (isTypeName != DTypename) continue; 5504 5505 // using decls differ if they name different scopes (but note that 5506 // template instantiation can cause this check to trigger when it 5507 // didn't before instantiation). 5508 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5509 Context.getCanonicalNestedNameSpecifier(DQual)) 5510 continue; 5511 5512 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5513 Diag(D->getLocation(), diag::note_using_decl) << 1; 5514 return true; 5515 } 5516 5517 return false; 5518} 5519 5520 5521/// Checks that the given nested-name qualifier used in a using decl 5522/// in the current context is appropriately related to the current 5523/// scope. If an error is found, diagnoses it and returns true. 5524bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5525 const CXXScopeSpec &SS, 5526 SourceLocation NameLoc) { 5527 DeclContext *NamedContext = computeDeclContext(SS); 5528 5529 if (!CurContext->isRecord()) { 5530 // C++03 [namespace.udecl]p3: 5531 // C++0x [namespace.udecl]p8: 5532 // A using-declaration for a class member shall be a member-declaration. 5533 5534 // If we weren't able to compute a valid scope, it must be a 5535 // dependent class scope. 5536 if (!NamedContext || NamedContext->isRecord()) { 5537 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5538 << SS.getRange(); 5539 return true; 5540 } 5541 5542 // Otherwise, everything is known to be fine. 5543 return false; 5544 } 5545 5546 // The current scope is a record. 5547 5548 // If the named context is dependent, we can't decide much. 5549 if (!NamedContext) { 5550 // FIXME: in C++0x, we can diagnose if we can prove that the 5551 // nested-name-specifier does not refer to a base class, which is 5552 // still possible in some cases. 5553 5554 // Otherwise we have to conservatively report that things might be 5555 // okay. 5556 return false; 5557 } 5558 5559 if (!NamedContext->isRecord()) { 5560 // Ideally this would point at the last name in the specifier, 5561 // but we don't have that level of source info. 5562 Diag(SS.getRange().getBegin(), 5563 diag::err_using_decl_nested_name_specifier_is_not_class) 5564 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5565 return true; 5566 } 5567 5568 if (!NamedContext->isDependentContext() && 5569 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5570 return true; 5571 5572 if (getLangOptions().CPlusPlus0x) { 5573 // C++0x [namespace.udecl]p3: 5574 // In a using-declaration used as a member-declaration, the 5575 // nested-name-specifier shall name a base class of the class 5576 // being defined. 5577 5578 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5579 cast<CXXRecordDecl>(NamedContext))) { 5580 if (CurContext == NamedContext) { 5581 Diag(NameLoc, 5582 diag::err_using_decl_nested_name_specifier_is_current_class) 5583 << SS.getRange(); 5584 return true; 5585 } 5586 5587 Diag(SS.getRange().getBegin(), 5588 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5589 << (NestedNameSpecifier*) SS.getScopeRep() 5590 << cast<CXXRecordDecl>(CurContext) 5591 << SS.getRange(); 5592 return true; 5593 } 5594 5595 return false; 5596 } 5597 5598 // C++03 [namespace.udecl]p4: 5599 // A using-declaration used as a member-declaration shall refer 5600 // to a member of a base class of the class being defined [etc.]. 5601 5602 // Salient point: SS doesn't have to name a base class as long as 5603 // lookup only finds members from base classes. Therefore we can 5604 // diagnose here only if we can prove that that can't happen, 5605 // i.e. if the class hierarchies provably don't intersect. 5606 5607 // TODO: it would be nice if "definitely valid" results were cached 5608 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5609 // need to be repeated. 5610 5611 struct UserData { 5612 llvm::DenseSet<const CXXRecordDecl*> Bases; 5613 5614 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5615 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5616 Data->Bases.insert(Base); 5617 return true; 5618 } 5619 5620 bool hasDependentBases(const CXXRecordDecl *Class) { 5621 return !Class->forallBases(collect, this); 5622 } 5623 5624 /// Returns true if the base is dependent or is one of the 5625 /// accumulated base classes. 5626 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5627 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5628 return !Data->Bases.count(Base); 5629 } 5630 5631 bool mightShareBases(const CXXRecordDecl *Class) { 5632 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5633 } 5634 }; 5635 5636 UserData Data; 5637 5638 // Returns false if we find a dependent base. 5639 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5640 return false; 5641 5642 // Returns false if the class has a dependent base or if it or one 5643 // of its bases is present in the base set of the current context. 5644 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5645 return false; 5646 5647 Diag(SS.getRange().getBegin(), 5648 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5649 << (NestedNameSpecifier*) SS.getScopeRep() 5650 << cast<CXXRecordDecl>(CurContext) 5651 << SS.getRange(); 5652 5653 return true; 5654} 5655 5656Decl *Sema::ActOnAliasDeclaration(Scope *S, 5657 AccessSpecifier AS, 5658 MultiTemplateParamsArg TemplateParamLists, 5659 SourceLocation UsingLoc, 5660 UnqualifiedId &Name, 5661 TypeResult Type) { 5662 // Skip up to the relevant declaration scope. 5663 while (S->getFlags() & Scope::TemplateParamScope) 5664 S = S->getParent(); 5665 assert((S->getFlags() & Scope::DeclScope) && 5666 "got alias-declaration outside of declaration scope"); 5667 5668 if (Type.isInvalid()) 5669 return 0; 5670 5671 bool Invalid = false; 5672 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5673 TypeSourceInfo *TInfo = 0; 5674 GetTypeFromParser(Type.get(), &TInfo); 5675 5676 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5677 return 0; 5678 5679 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5680 UPPC_DeclarationType)) { 5681 Invalid = true; 5682 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5683 TInfo->getTypeLoc().getBeginLoc()); 5684 } 5685 5686 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5687 LookupName(Previous, S); 5688 5689 // Warn about shadowing the name of a template parameter. 5690 if (Previous.isSingleResult() && 5691 Previous.getFoundDecl()->isTemplateParameter()) { 5692 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5693 Previous.getFoundDecl())) 5694 Invalid = true; 5695 Previous.clear(); 5696 } 5697 5698 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5699 "name in alias declaration must be an identifier"); 5700 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5701 Name.StartLocation, 5702 Name.Identifier, TInfo); 5703 5704 NewTD->setAccess(AS); 5705 5706 if (Invalid) 5707 NewTD->setInvalidDecl(); 5708 5709 CheckTypedefForVariablyModifiedType(S, NewTD); 5710 Invalid |= NewTD->isInvalidDecl(); 5711 5712 bool Redeclaration = false; 5713 5714 NamedDecl *NewND; 5715 if (TemplateParamLists.size()) { 5716 TypeAliasTemplateDecl *OldDecl = 0; 5717 TemplateParameterList *OldTemplateParams = 0; 5718 5719 if (TemplateParamLists.size() != 1) { 5720 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5721 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5722 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5723 } 5724 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5725 5726 // Only consider previous declarations in the same scope. 5727 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5728 /*ExplicitInstantiationOrSpecialization*/false); 5729 if (!Previous.empty()) { 5730 Redeclaration = true; 5731 5732 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5733 if (!OldDecl && !Invalid) { 5734 Diag(UsingLoc, diag::err_redefinition_different_kind) 5735 << Name.Identifier; 5736 5737 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5738 if (OldD->getLocation().isValid()) 5739 Diag(OldD->getLocation(), diag::note_previous_definition); 5740 5741 Invalid = true; 5742 } 5743 5744 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5745 if (TemplateParameterListsAreEqual(TemplateParams, 5746 OldDecl->getTemplateParameters(), 5747 /*Complain=*/true, 5748 TPL_TemplateMatch)) 5749 OldTemplateParams = OldDecl->getTemplateParameters(); 5750 else 5751 Invalid = true; 5752 5753 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5754 if (!Invalid && 5755 !Context.hasSameType(OldTD->getUnderlyingType(), 5756 NewTD->getUnderlyingType())) { 5757 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5758 // but we can't reasonably accept it. 5759 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5760 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5761 if (OldTD->getLocation().isValid()) 5762 Diag(OldTD->getLocation(), diag::note_previous_definition); 5763 Invalid = true; 5764 } 5765 } 5766 } 5767 5768 // Merge any previous default template arguments into our parameters, 5769 // and check the parameter list. 5770 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5771 TPC_TypeAliasTemplate)) 5772 return 0; 5773 5774 TypeAliasTemplateDecl *NewDecl = 5775 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5776 Name.Identifier, TemplateParams, 5777 NewTD); 5778 5779 NewDecl->setAccess(AS); 5780 5781 if (Invalid) 5782 NewDecl->setInvalidDecl(); 5783 else if (OldDecl) 5784 NewDecl->setPreviousDeclaration(OldDecl); 5785 5786 NewND = NewDecl; 5787 } else { 5788 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5789 NewND = NewTD; 5790 } 5791 5792 if (!Redeclaration) 5793 PushOnScopeChains(NewND, S); 5794 5795 return NewND; 5796} 5797 5798Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5799 SourceLocation NamespaceLoc, 5800 SourceLocation AliasLoc, 5801 IdentifierInfo *Alias, 5802 CXXScopeSpec &SS, 5803 SourceLocation IdentLoc, 5804 IdentifierInfo *Ident) { 5805 5806 // Lookup the namespace name. 5807 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5808 LookupParsedName(R, S, &SS); 5809 5810 // Check if we have a previous declaration with the same name. 5811 NamedDecl *PrevDecl 5812 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5813 ForRedeclaration); 5814 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5815 PrevDecl = 0; 5816 5817 if (PrevDecl) { 5818 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5819 // We already have an alias with the same name that points to the same 5820 // namespace, so don't create a new one. 5821 // FIXME: At some point, we'll want to create the (redundant) 5822 // declaration to maintain better source information. 5823 if (!R.isAmbiguous() && !R.empty() && 5824 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5825 return 0; 5826 } 5827 5828 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5829 diag::err_redefinition_different_kind; 5830 Diag(AliasLoc, DiagID) << Alias; 5831 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5832 return 0; 5833 } 5834 5835 if (R.isAmbiguous()) 5836 return 0; 5837 5838 if (R.empty()) { 5839 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 5840 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5841 return 0; 5842 } 5843 } 5844 5845 NamespaceAliasDecl *AliasDecl = 5846 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5847 Alias, SS.getWithLocInContext(Context), 5848 IdentLoc, R.getFoundDecl()); 5849 5850 PushOnScopeChains(AliasDecl, S); 5851 return AliasDecl; 5852} 5853 5854namespace { 5855 /// \brief Scoped object used to handle the state changes required in Sema 5856 /// to implicitly define the body of a C++ member function; 5857 class ImplicitlyDefinedFunctionScope { 5858 Sema &S; 5859 Sema::ContextRAII SavedContext; 5860 5861 public: 5862 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5863 : S(S), SavedContext(S, Method) 5864 { 5865 S.PushFunctionScope(); 5866 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5867 } 5868 5869 ~ImplicitlyDefinedFunctionScope() { 5870 S.PopExpressionEvaluationContext(); 5871 S.PopFunctionOrBlockScope(); 5872 } 5873 }; 5874} 5875 5876Sema::ImplicitExceptionSpecification 5877Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5878 // C++ [except.spec]p14: 5879 // An implicitly declared special member function (Clause 12) shall have an 5880 // exception-specification. [...] 5881 ImplicitExceptionSpecification ExceptSpec(Context); 5882 if (ClassDecl->isInvalidDecl()) 5883 return ExceptSpec; 5884 5885 // Direct base-class constructors. 5886 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5887 BEnd = ClassDecl->bases_end(); 5888 B != BEnd; ++B) { 5889 if (B->isVirtual()) // Handled below. 5890 continue; 5891 5892 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5893 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5894 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5895 // If this is a deleted function, add it anyway. This might be conformant 5896 // with the standard. This might not. I'm not sure. It might not matter. 5897 if (Constructor) 5898 ExceptSpec.CalledDecl(Constructor); 5899 } 5900 } 5901 5902 // Virtual base-class constructors. 5903 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5904 BEnd = ClassDecl->vbases_end(); 5905 B != BEnd; ++B) { 5906 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5907 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5908 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5909 // If this is a deleted function, add it anyway. This might be conformant 5910 // with the standard. This might not. I'm not sure. It might not matter. 5911 if (Constructor) 5912 ExceptSpec.CalledDecl(Constructor); 5913 } 5914 } 5915 5916 // Field constructors. 5917 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5918 FEnd = ClassDecl->field_end(); 5919 F != FEnd; ++F) { 5920 if (F->hasInClassInitializer()) { 5921 if (Expr *E = F->getInClassInitializer()) 5922 ExceptSpec.CalledExpr(E); 5923 else if (!F->isInvalidDecl()) 5924 ExceptSpec.SetDelayed(); 5925 } else if (const RecordType *RecordTy 5926 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5927 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5928 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5929 // If this is a deleted function, add it anyway. This might be conformant 5930 // with the standard. This might not. I'm not sure. It might not matter. 5931 // In particular, the problem is that this function never gets called. It 5932 // might just be ill-formed because this function attempts to refer to 5933 // a deleted function here. 5934 if (Constructor) 5935 ExceptSpec.CalledDecl(Constructor); 5936 } 5937 } 5938 5939 return ExceptSpec; 5940} 5941 5942CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5943 CXXRecordDecl *ClassDecl) { 5944 // C++ [class.ctor]p5: 5945 // A default constructor for a class X is a constructor of class X 5946 // that can be called without an argument. If there is no 5947 // user-declared constructor for class X, a default constructor is 5948 // implicitly declared. An implicitly-declared default constructor 5949 // is an inline public member of its class. 5950 assert(!ClassDecl->hasUserDeclaredConstructor() && 5951 "Should not build implicit default constructor!"); 5952 5953 ImplicitExceptionSpecification Spec = 5954 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5955 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5956 5957 // Create the actual constructor declaration. 5958 CanQualType ClassType 5959 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5960 SourceLocation ClassLoc = ClassDecl->getLocation(); 5961 DeclarationName Name 5962 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5963 DeclarationNameInfo NameInfo(Name, ClassLoc); 5964 CXXConstructorDecl *DefaultCon 5965 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5966 Context.getFunctionType(Context.VoidTy, 5967 0, 0, EPI), 5968 /*TInfo=*/0, 5969 /*isExplicit=*/false, 5970 /*isInline=*/true, 5971 /*isImplicitlyDeclared=*/true); 5972 DefaultCon->setAccess(AS_public); 5973 DefaultCon->setDefaulted(); 5974 DefaultCon->setImplicit(); 5975 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5976 5977 // Note that we have declared this constructor. 5978 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5979 5980 if (Scope *S = getScopeForContext(ClassDecl)) 5981 PushOnScopeChains(DefaultCon, S, false); 5982 ClassDecl->addDecl(DefaultCon); 5983 5984 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5985 DefaultCon->setDeletedAsWritten(); 5986 5987 return DefaultCon; 5988} 5989 5990void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5991 CXXConstructorDecl *Constructor) { 5992 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5993 !Constructor->doesThisDeclarationHaveABody() && 5994 !Constructor->isDeleted()) && 5995 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5996 5997 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5998 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5999 6000 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6001 DiagnosticErrorTrap Trap(Diags); 6002 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6003 Trap.hasErrorOccurred()) { 6004 Diag(CurrentLocation, diag::note_member_synthesized_at) 6005 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6006 Constructor->setInvalidDecl(); 6007 return; 6008 } 6009 6010 SourceLocation Loc = Constructor->getLocation(); 6011 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6012 6013 Constructor->setUsed(); 6014 MarkVTableUsed(CurrentLocation, ClassDecl); 6015 6016 if (ASTMutationListener *L = getASTMutationListener()) { 6017 L->CompletedImplicitDefinition(Constructor); 6018 } 6019} 6020 6021/// Get any existing defaulted default constructor for the given class. Do not 6022/// implicitly define one if it does not exist. 6023static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6024 CXXRecordDecl *D) { 6025 ASTContext &Context = Self.Context; 6026 QualType ClassType = Context.getTypeDeclType(D); 6027 DeclarationName ConstructorName 6028 = Context.DeclarationNames.getCXXConstructorName( 6029 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6030 6031 DeclContext::lookup_const_iterator Con, ConEnd; 6032 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6033 Con != ConEnd; ++Con) { 6034 // A function template cannot be defaulted. 6035 if (isa<FunctionTemplateDecl>(*Con)) 6036 continue; 6037 6038 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6039 if (Constructor->isDefaultConstructor()) 6040 return Constructor->isDefaulted() ? Constructor : 0; 6041 } 6042 return 0; 6043} 6044 6045void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6046 if (!D) return; 6047 AdjustDeclIfTemplate(D); 6048 6049 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6050 CXXConstructorDecl *CtorDecl 6051 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6052 6053 if (!CtorDecl) return; 6054 6055 // Compute the exception specification for the default constructor. 6056 const FunctionProtoType *CtorTy = 6057 CtorDecl->getType()->castAs<FunctionProtoType>(); 6058 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6059 ImplicitExceptionSpecification Spec = 6060 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6061 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6062 assert(EPI.ExceptionSpecType != EST_Delayed); 6063 6064 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6065 } 6066 6067 // If the default constructor is explicitly defaulted, checking the exception 6068 // specification is deferred until now. 6069 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6070 !ClassDecl->isDependentType()) 6071 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6072} 6073 6074void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6075 // We start with an initial pass over the base classes to collect those that 6076 // inherit constructors from. If there are none, we can forgo all further 6077 // processing. 6078 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6079 BasesVector BasesToInheritFrom; 6080 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6081 BaseE = ClassDecl->bases_end(); 6082 BaseIt != BaseE; ++BaseIt) { 6083 if (BaseIt->getInheritConstructors()) { 6084 QualType Base = BaseIt->getType(); 6085 if (Base->isDependentType()) { 6086 // If we inherit constructors from anything that is dependent, just 6087 // abort processing altogether. We'll get another chance for the 6088 // instantiations. 6089 return; 6090 } 6091 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6092 } 6093 } 6094 if (BasesToInheritFrom.empty()) 6095 return; 6096 6097 // Now collect the constructors that we already have in the current class. 6098 // Those take precedence over inherited constructors. 6099 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6100 // unless there is a user-declared constructor with the same signature in 6101 // the class where the using-declaration appears. 6102 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6103 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6104 CtorE = ClassDecl->ctor_end(); 6105 CtorIt != CtorE; ++CtorIt) { 6106 ExistingConstructors.insert( 6107 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6108 } 6109 6110 Scope *S = getScopeForContext(ClassDecl); 6111 DeclarationName CreatedCtorName = 6112 Context.DeclarationNames.getCXXConstructorName( 6113 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6114 6115 // Now comes the true work. 6116 // First, we keep a map from constructor types to the base that introduced 6117 // them. Needed for finding conflicting constructors. We also keep the 6118 // actually inserted declarations in there, for pretty diagnostics. 6119 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6120 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6121 ConstructorToSourceMap InheritedConstructors; 6122 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6123 BaseE = BasesToInheritFrom.end(); 6124 BaseIt != BaseE; ++BaseIt) { 6125 const RecordType *Base = *BaseIt; 6126 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6127 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6128 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6129 CtorE = BaseDecl->ctor_end(); 6130 CtorIt != CtorE; ++CtorIt) { 6131 // Find the using declaration for inheriting this base's constructors. 6132 DeclarationName Name = 6133 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6134 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6135 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6136 SourceLocation UsingLoc = UD ? UD->getLocation() : 6137 ClassDecl->getLocation(); 6138 6139 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6140 // from the class X named in the using-declaration consists of actual 6141 // constructors and notional constructors that result from the 6142 // transformation of defaulted parameters as follows: 6143 // - all non-template default constructors of X, and 6144 // - for each non-template constructor of X that has at least one 6145 // parameter with a default argument, the set of constructors that 6146 // results from omitting any ellipsis parameter specification and 6147 // successively omitting parameters with a default argument from the 6148 // end of the parameter-type-list. 6149 CXXConstructorDecl *BaseCtor = *CtorIt; 6150 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6151 const FunctionProtoType *BaseCtorType = 6152 BaseCtor->getType()->getAs<FunctionProtoType>(); 6153 6154 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6155 maxParams = BaseCtor->getNumParams(); 6156 params <= maxParams; ++params) { 6157 // Skip default constructors. They're never inherited. 6158 if (params == 0) 6159 continue; 6160 // Skip copy and move constructors for the same reason. 6161 if (CanBeCopyOrMove && params == 1) 6162 continue; 6163 6164 // Build up a function type for this particular constructor. 6165 // FIXME: The working paper does not consider that the exception spec 6166 // for the inheriting constructor might be larger than that of the 6167 // source. This code doesn't yet, either. When it does, this code will 6168 // need to be delayed until after exception specifications and in-class 6169 // member initializers are attached. 6170 const Type *NewCtorType; 6171 if (params == maxParams) 6172 NewCtorType = BaseCtorType; 6173 else { 6174 llvm::SmallVector<QualType, 16> Args; 6175 for (unsigned i = 0; i < params; ++i) { 6176 Args.push_back(BaseCtorType->getArgType(i)); 6177 } 6178 FunctionProtoType::ExtProtoInfo ExtInfo = 6179 BaseCtorType->getExtProtoInfo(); 6180 ExtInfo.Variadic = false; 6181 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6182 Args.data(), params, ExtInfo) 6183 .getTypePtr(); 6184 } 6185 const Type *CanonicalNewCtorType = 6186 Context.getCanonicalType(NewCtorType); 6187 6188 // Now that we have the type, first check if the class already has a 6189 // constructor with this signature. 6190 if (ExistingConstructors.count(CanonicalNewCtorType)) 6191 continue; 6192 6193 // Then we check if we have already declared an inherited constructor 6194 // with this signature. 6195 std::pair<ConstructorToSourceMap::iterator, bool> result = 6196 InheritedConstructors.insert(std::make_pair( 6197 CanonicalNewCtorType, 6198 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6199 if (!result.second) { 6200 // Already in the map. If it came from a different class, that's an 6201 // error. Not if it's from the same. 6202 CanQualType PreviousBase = result.first->second.first; 6203 if (CanonicalBase != PreviousBase) { 6204 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6205 const CXXConstructorDecl *PrevBaseCtor = 6206 PrevCtor->getInheritedConstructor(); 6207 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6208 6209 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6210 Diag(BaseCtor->getLocation(), 6211 diag::note_using_decl_constructor_conflict_current_ctor); 6212 Diag(PrevBaseCtor->getLocation(), 6213 diag::note_using_decl_constructor_conflict_previous_ctor); 6214 Diag(PrevCtor->getLocation(), 6215 diag::note_using_decl_constructor_conflict_previous_using); 6216 } 6217 continue; 6218 } 6219 6220 // OK, we're there, now add the constructor. 6221 // C++0x [class.inhctor]p8: [...] that would be performed by a 6222 // user-writtern inline constructor [...] 6223 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6224 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6225 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6226 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6227 /*ImplicitlyDeclared=*/true); 6228 NewCtor->setAccess(BaseCtor->getAccess()); 6229 6230 // Build up the parameter decls and add them. 6231 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6232 for (unsigned i = 0; i < params; ++i) { 6233 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6234 UsingLoc, UsingLoc, 6235 /*IdentifierInfo=*/0, 6236 BaseCtorType->getArgType(i), 6237 /*TInfo=*/0, SC_None, 6238 SC_None, /*DefaultArg=*/0)); 6239 } 6240 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6241 NewCtor->setInheritedConstructor(BaseCtor); 6242 6243 PushOnScopeChains(NewCtor, S, false); 6244 ClassDecl->addDecl(NewCtor); 6245 result.first->second.second = NewCtor; 6246 } 6247 } 6248 } 6249} 6250 6251Sema::ImplicitExceptionSpecification 6252Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6253 // C++ [except.spec]p14: 6254 // An implicitly declared special member function (Clause 12) shall have 6255 // an exception-specification. 6256 ImplicitExceptionSpecification ExceptSpec(Context); 6257 if (ClassDecl->isInvalidDecl()) 6258 return ExceptSpec; 6259 6260 // Direct base-class destructors. 6261 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6262 BEnd = ClassDecl->bases_end(); 6263 B != BEnd; ++B) { 6264 if (B->isVirtual()) // Handled below. 6265 continue; 6266 6267 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6268 ExceptSpec.CalledDecl( 6269 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6270 } 6271 6272 // Virtual base-class destructors. 6273 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6274 BEnd = ClassDecl->vbases_end(); 6275 B != BEnd; ++B) { 6276 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6277 ExceptSpec.CalledDecl( 6278 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6279 } 6280 6281 // Field destructors. 6282 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6283 FEnd = ClassDecl->field_end(); 6284 F != FEnd; ++F) { 6285 if (const RecordType *RecordTy 6286 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6287 ExceptSpec.CalledDecl( 6288 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6289 } 6290 6291 return ExceptSpec; 6292} 6293 6294CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6295 // C++ [class.dtor]p2: 6296 // If a class has no user-declared destructor, a destructor is 6297 // declared implicitly. An implicitly-declared destructor is an 6298 // inline public member of its class. 6299 6300 ImplicitExceptionSpecification Spec = 6301 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6302 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6303 6304 // Create the actual destructor declaration. 6305 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6306 6307 CanQualType ClassType 6308 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6309 SourceLocation ClassLoc = ClassDecl->getLocation(); 6310 DeclarationName Name 6311 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6312 DeclarationNameInfo NameInfo(Name, ClassLoc); 6313 CXXDestructorDecl *Destructor 6314 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6315 /*isInline=*/true, 6316 /*isImplicitlyDeclared=*/true); 6317 Destructor->setAccess(AS_public); 6318 Destructor->setDefaulted(); 6319 Destructor->setImplicit(); 6320 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6321 6322 // Note that we have declared this destructor. 6323 ++ASTContext::NumImplicitDestructorsDeclared; 6324 6325 // Introduce this destructor into its scope. 6326 if (Scope *S = getScopeForContext(ClassDecl)) 6327 PushOnScopeChains(Destructor, S, false); 6328 ClassDecl->addDecl(Destructor); 6329 6330 // This could be uniqued if it ever proves significant. 6331 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6332 6333 if (ShouldDeleteDestructor(Destructor)) 6334 Destructor->setDeletedAsWritten(); 6335 6336 AddOverriddenMethods(ClassDecl, Destructor); 6337 6338 return Destructor; 6339} 6340 6341void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6342 CXXDestructorDecl *Destructor) { 6343 assert((Destructor->isDefaulted() && 6344 !Destructor->doesThisDeclarationHaveABody()) && 6345 "DefineImplicitDestructor - call it for implicit default dtor"); 6346 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6347 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6348 6349 if (Destructor->isInvalidDecl()) 6350 return; 6351 6352 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6353 6354 DiagnosticErrorTrap Trap(Diags); 6355 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6356 Destructor->getParent()); 6357 6358 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6359 Diag(CurrentLocation, diag::note_member_synthesized_at) 6360 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6361 6362 Destructor->setInvalidDecl(); 6363 return; 6364 } 6365 6366 SourceLocation Loc = Destructor->getLocation(); 6367 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6368 6369 Destructor->setUsed(); 6370 MarkVTableUsed(CurrentLocation, ClassDecl); 6371 6372 if (ASTMutationListener *L = getASTMutationListener()) { 6373 L->CompletedImplicitDefinition(Destructor); 6374 } 6375} 6376 6377void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6378 CXXDestructorDecl *destructor) { 6379 // C++11 [class.dtor]p3: 6380 // A declaration of a destructor that does not have an exception- 6381 // specification is implicitly considered to have the same exception- 6382 // specification as an implicit declaration. 6383 const FunctionProtoType *dtorType = destructor->getType()-> 6384 getAs<FunctionProtoType>(); 6385 if (dtorType->hasExceptionSpec()) 6386 return; 6387 6388 ImplicitExceptionSpecification exceptSpec = 6389 ComputeDefaultedDtorExceptionSpec(classDecl); 6390 6391 // Replace the destructor's type. 6392 FunctionProtoType::ExtProtoInfo epi; 6393 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6394 epi.NumExceptions = exceptSpec.size(); 6395 epi.Exceptions = exceptSpec.data(); 6396 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6397 6398 destructor->setType(ty); 6399 6400 // FIXME: If the destructor has a body that could throw, and the newly created 6401 // spec doesn't allow exceptions, we should emit a warning, because this 6402 // change in behavior can break conforming C++03 programs at runtime. 6403 // However, we don't have a body yet, so it needs to be done somewhere else. 6404} 6405 6406/// \brief Builds a statement that copies the given entity from \p From to 6407/// \c To. 6408/// 6409/// This routine is used to copy the members of a class with an 6410/// implicitly-declared copy assignment operator. When the entities being 6411/// copied are arrays, this routine builds for loops to copy them. 6412/// 6413/// \param S The Sema object used for type-checking. 6414/// 6415/// \param Loc The location where the implicit copy is being generated. 6416/// 6417/// \param T The type of the expressions being copied. Both expressions must 6418/// have this type. 6419/// 6420/// \param To The expression we are copying to. 6421/// 6422/// \param From The expression we are copying from. 6423/// 6424/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6425/// Otherwise, it's a non-static member subobject. 6426/// 6427/// \param Depth Internal parameter recording the depth of the recursion. 6428/// 6429/// \returns A statement or a loop that copies the expressions. 6430static StmtResult 6431BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6432 Expr *To, Expr *From, 6433 bool CopyingBaseSubobject, unsigned Depth = 0) { 6434 // C++0x [class.copy]p30: 6435 // Each subobject is assigned in the manner appropriate to its type: 6436 // 6437 // - if the subobject is of class type, the copy assignment operator 6438 // for the class is used (as if by explicit qualification; that is, 6439 // ignoring any possible virtual overriding functions in more derived 6440 // classes); 6441 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6442 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6443 6444 // Look for operator=. 6445 DeclarationName Name 6446 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6447 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6448 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6449 6450 // Filter out any result that isn't a copy-assignment operator. 6451 LookupResult::Filter F = OpLookup.makeFilter(); 6452 while (F.hasNext()) { 6453 NamedDecl *D = F.next(); 6454 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6455 if (Method->isCopyAssignmentOperator()) 6456 continue; 6457 6458 F.erase(); 6459 } 6460 F.done(); 6461 6462 // Suppress the protected check (C++ [class.protected]) for each of the 6463 // assignment operators we found. This strange dance is required when 6464 // we're assigning via a base classes's copy-assignment operator. To 6465 // ensure that we're getting the right base class subobject (without 6466 // ambiguities), we need to cast "this" to that subobject type; to 6467 // ensure that we don't go through the virtual call mechanism, we need 6468 // to qualify the operator= name with the base class (see below). However, 6469 // this means that if the base class has a protected copy assignment 6470 // operator, the protected member access check will fail. So, we 6471 // rewrite "protected" access to "public" access in this case, since we 6472 // know by construction that we're calling from a derived class. 6473 if (CopyingBaseSubobject) { 6474 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6475 L != LEnd; ++L) { 6476 if (L.getAccess() == AS_protected) 6477 L.setAccess(AS_public); 6478 } 6479 } 6480 6481 // Create the nested-name-specifier that will be used to qualify the 6482 // reference to operator=; this is required to suppress the virtual 6483 // call mechanism. 6484 CXXScopeSpec SS; 6485 SS.MakeTrivial(S.Context, 6486 NestedNameSpecifier::Create(S.Context, 0, false, 6487 T.getTypePtr()), 6488 Loc); 6489 6490 // Create the reference to operator=. 6491 ExprResult OpEqualRef 6492 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6493 /*FirstQualifierInScope=*/0, OpLookup, 6494 /*TemplateArgs=*/0, 6495 /*SuppressQualifierCheck=*/true); 6496 if (OpEqualRef.isInvalid()) 6497 return StmtError(); 6498 6499 // Build the call to the assignment operator. 6500 6501 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6502 OpEqualRef.takeAs<Expr>(), 6503 Loc, &From, 1, Loc); 6504 if (Call.isInvalid()) 6505 return StmtError(); 6506 6507 return S.Owned(Call.takeAs<Stmt>()); 6508 } 6509 6510 // - if the subobject is of scalar type, the built-in assignment 6511 // operator is used. 6512 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6513 if (!ArrayTy) { 6514 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6515 if (Assignment.isInvalid()) 6516 return StmtError(); 6517 6518 return S.Owned(Assignment.takeAs<Stmt>()); 6519 } 6520 6521 // - if the subobject is an array, each element is assigned, in the 6522 // manner appropriate to the element type; 6523 6524 // Construct a loop over the array bounds, e.g., 6525 // 6526 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6527 // 6528 // that will copy each of the array elements. 6529 QualType SizeType = S.Context.getSizeType(); 6530 6531 // Create the iteration variable. 6532 IdentifierInfo *IterationVarName = 0; 6533 { 6534 llvm::SmallString<8> Str; 6535 llvm::raw_svector_ostream OS(Str); 6536 OS << "__i" << Depth; 6537 IterationVarName = &S.Context.Idents.get(OS.str()); 6538 } 6539 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6540 IterationVarName, SizeType, 6541 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6542 SC_None, SC_None); 6543 6544 // Initialize the iteration variable to zero. 6545 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6546 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6547 6548 // Create a reference to the iteration variable; we'll use this several 6549 // times throughout. 6550 Expr *IterationVarRef 6551 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6552 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6553 6554 // Create the DeclStmt that holds the iteration variable. 6555 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6556 6557 // Create the comparison against the array bound. 6558 llvm::APInt Upper 6559 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6560 Expr *Comparison 6561 = new (S.Context) BinaryOperator(IterationVarRef, 6562 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6563 BO_NE, S.Context.BoolTy, 6564 VK_RValue, OK_Ordinary, Loc); 6565 6566 // Create the pre-increment of the iteration variable. 6567 Expr *Increment 6568 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6569 VK_LValue, OK_Ordinary, Loc); 6570 6571 // Subscript the "from" and "to" expressions with the iteration variable. 6572 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6573 IterationVarRef, Loc)); 6574 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6575 IterationVarRef, Loc)); 6576 6577 // Build the copy for an individual element of the array. 6578 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6579 To, From, CopyingBaseSubobject, 6580 Depth + 1); 6581 if (Copy.isInvalid()) 6582 return StmtError(); 6583 6584 // Construct the loop that copies all elements of this array. 6585 return S.ActOnForStmt(Loc, Loc, InitStmt, 6586 S.MakeFullExpr(Comparison), 6587 0, S.MakeFullExpr(Increment), 6588 Loc, Copy.take()); 6589} 6590 6591std::pair<Sema::ImplicitExceptionSpecification, bool> 6592Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6593 CXXRecordDecl *ClassDecl) { 6594 if (ClassDecl->isInvalidDecl()) 6595 return std::make_pair(ImplicitExceptionSpecification(Context), false); 6596 6597 // C++ [class.copy]p10: 6598 // If the class definition does not explicitly declare a copy 6599 // assignment operator, one is declared implicitly. 6600 // The implicitly-defined copy assignment operator for a class X 6601 // will have the form 6602 // 6603 // X& X::operator=(const X&) 6604 // 6605 // if 6606 bool HasConstCopyAssignment = true; 6607 6608 // -- each direct base class B of X has a copy assignment operator 6609 // whose parameter is of type const B&, const volatile B& or B, 6610 // and 6611 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6612 BaseEnd = ClassDecl->bases_end(); 6613 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6614 // We'll handle this below 6615 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 6616 continue; 6617 6618 assert(!Base->getType()->isDependentType() && 6619 "Cannot generate implicit members for class with dependent bases."); 6620 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6621 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6622 &HasConstCopyAssignment); 6623 } 6624 6625 // In C++0x, the above citation has "or virtual added" 6626 if (LangOpts.CPlusPlus0x) { 6627 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6628 BaseEnd = ClassDecl->vbases_end(); 6629 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6630 assert(!Base->getType()->isDependentType() && 6631 "Cannot generate implicit members for class with dependent bases."); 6632 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6633 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6634 &HasConstCopyAssignment); 6635 } 6636 } 6637 6638 // -- for all the nonstatic data members of X that are of a class 6639 // type M (or array thereof), each such class type has a copy 6640 // assignment operator whose parameter is of type const M&, 6641 // const volatile M& or M. 6642 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6643 FieldEnd = ClassDecl->field_end(); 6644 HasConstCopyAssignment && Field != FieldEnd; 6645 ++Field) { 6646 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6647 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6648 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 6649 &HasConstCopyAssignment); 6650 } 6651 } 6652 6653 // Otherwise, the implicitly declared copy assignment operator will 6654 // have the form 6655 // 6656 // X& X::operator=(X&) 6657 6658 // C++ [except.spec]p14: 6659 // An implicitly declared special member function (Clause 12) shall have an 6660 // exception-specification. [...] 6661 6662 // It is unspecified whether or not an implicit copy assignment operator 6663 // attempts to deduplicate calls to assignment operators of virtual bases are 6664 // made. As such, this exception specification is effectively unspecified. 6665 // Based on a similar decision made for constness in C++0x, we're erring on 6666 // the side of assuming such calls to be made regardless of whether they 6667 // actually happen. 6668 ImplicitExceptionSpecification ExceptSpec(Context); 6669 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 6670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6671 BaseEnd = ClassDecl->bases_end(); 6672 Base != BaseEnd; ++Base) { 6673 if (Base->isVirtual()) 6674 continue; 6675 6676 CXXRecordDecl *BaseClassDecl 6677 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6678 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6679 ArgQuals, false, 0)) 6680 ExceptSpec.CalledDecl(CopyAssign); 6681 } 6682 6683 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6684 BaseEnd = ClassDecl->vbases_end(); 6685 Base != BaseEnd; ++Base) { 6686 CXXRecordDecl *BaseClassDecl 6687 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6688 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6689 ArgQuals, false, 0)) 6690 ExceptSpec.CalledDecl(CopyAssign); 6691 } 6692 6693 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6694 FieldEnd = ClassDecl->field_end(); 6695 Field != FieldEnd; 6696 ++Field) { 6697 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6698 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6699 if (CXXMethodDecl *CopyAssign = 6700 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 6701 ExceptSpec.CalledDecl(CopyAssign); 6702 } 6703 } 6704 6705 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6706} 6707 6708CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6709 // Note: The following rules are largely analoguous to the copy 6710 // constructor rules. Note that virtual bases are not taken into account 6711 // for determining the argument type of the operator. Note also that 6712 // operators taking an object instead of a reference are allowed. 6713 6714 ImplicitExceptionSpecification Spec(Context); 6715 bool Const; 6716 llvm::tie(Spec, Const) = 6717 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6718 6719 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6720 QualType RetType = Context.getLValueReferenceType(ArgType); 6721 if (Const) 6722 ArgType = ArgType.withConst(); 6723 ArgType = Context.getLValueReferenceType(ArgType); 6724 6725 // An implicitly-declared copy assignment operator is an inline public 6726 // member of its class. 6727 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6728 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6729 SourceLocation ClassLoc = ClassDecl->getLocation(); 6730 DeclarationNameInfo NameInfo(Name, ClassLoc); 6731 CXXMethodDecl *CopyAssignment 6732 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6733 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6734 /*TInfo=*/0, /*isStatic=*/false, 6735 /*StorageClassAsWritten=*/SC_None, 6736 /*isInline=*/true, 6737 SourceLocation()); 6738 CopyAssignment->setAccess(AS_public); 6739 CopyAssignment->setDefaulted(); 6740 CopyAssignment->setImplicit(); 6741 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6742 6743 // Add the parameter to the operator. 6744 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6745 ClassLoc, ClassLoc, /*Id=*/0, 6746 ArgType, /*TInfo=*/0, 6747 SC_None, 6748 SC_None, 0); 6749 CopyAssignment->setParams(&FromParam, 1); 6750 6751 // Note that we have added this copy-assignment operator. 6752 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6753 6754 if (Scope *S = getScopeForContext(ClassDecl)) 6755 PushOnScopeChains(CopyAssignment, S, false); 6756 ClassDecl->addDecl(CopyAssignment); 6757 6758 // C++0x [class.copy]p18: 6759 // ... If the class definition declares a move constructor or move 6760 // assignment operator, the implicitly declared copy assignment operator is 6761 // defined as deleted; ... 6762 if (ClassDecl->hasUserDeclaredMoveConstructor() || 6763 ClassDecl->hasUserDeclaredMoveAssignment() || 6764 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6765 CopyAssignment->setDeletedAsWritten(); 6766 6767 AddOverriddenMethods(ClassDecl, CopyAssignment); 6768 return CopyAssignment; 6769} 6770 6771void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6772 CXXMethodDecl *CopyAssignOperator) { 6773 assert((CopyAssignOperator->isDefaulted() && 6774 CopyAssignOperator->isOverloadedOperator() && 6775 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6776 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6777 "DefineImplicitCopyAssignment called for wrong function"); 6778 6779 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6780 6781 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6782 CopyAssignOperator->setInvalidDecl(); 6783 return; 6784 } 6785 6786 CopyAssignOperator->setUsed(); 6787 6788 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6789 DiagnosticErrorTrap Trap(Diags); 6790 6791 // C++0x [class.copy]p30: 6792 // The implicitly-defined or explicitly-defaulted copy assignment operator 6793 // for a non-union class X performs memberwise copy assignment of its 6794 // subobjects. The direct base classes of X are assigned first, in the 6795 // order of their declaration in the base-specifier-list, and then the 6796 // immediate non-static data members of X are assigned, in the order in 6797 // which they were declared in the class definition. 6798 6799 // The statements that form the synthesized function body. 6800 ASTOwningVector<Stmt*> Statements(*this); 6801 6802 // The parameter for the "other" object, which we are copying from. 6803 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6804 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6805 QualType OtherRefType = Other->getType(); 6806 if (const LValueReferenceType *OtherRef 6807 = OtherRefType->getAs<LValueReferenceType>()) { 6808 OtherRefType = OtherRef->getPointeeType(); 6809 OtherQuals = OtherRefType.getQualifiers(); 6810 } 6811 6812 // Our location for everything implicitly-generated. 6813 SourceLocation Loc = CopyAssignOperator->getLocation(); 6814 6815 // Construct a reference to the "other" object. We'll be using this 6816 // throughout the generated ASTs. 6817 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6818 assert(OtherRef && "Reference to parameter cannot fail!"); 6819 6820 // Construct the "this" pointer. We'll be using this throughout the generated 6821 // ASTs. 6822 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6823 assert(This && "Reference to this cannot fail!"); 6824 6825 // Assign base classes. 6826 bool Invalid = false; 6827 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6828 E = ClassDecl->bases_end(); Base != E; ++Base) { 6829 // Form the assignment: 6830 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6831 QualType BaseType = Base->getType().getUnqualifiedType(); 6832 if (!BaseType->isRecordType()) { 6833 Invalid = true; 6834 continue; 6835 } 6836 6837 CXXCastPath BasePath; 6838 BasePath.push_back(Base); 6839 6840 // Construct the "from" expression, which is an implicit cast to the 6841 // appropriately-qualified base type. 6842 Expr *From = OtherRef; 6843 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6844 CK_UncheckedDerivedToBase, 6845 VK_LValue, &BasePath).take(); 6846 6847 // Dereference "this". 6848 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6849 6850 // Implicitly cast "this" to the appropriately-qualified base type. 6851 To = ImpCastExprToType(To.take(), 6852 Context.getCVRQualifiedType(BaseType, 6853 CopyAssignOperator->getTypeQualifiers()), 6854 CK_UncheckedDerivedToBase, 6855 VK_LValue, &BasePath); 6856 6857 // Build the copy. 6858 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6859 To.get(), From, 6860 /*CopyingBaseSubobject=*/true); 6861 if (Copy.isInvalid()) { 6862 Diag(CurrentLocation, diag::note_member_synthesized_at) 6863 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6864 CopyAssignOperator->setInvalidDecl(); 6865 return; 6866 } 6867 6868 // Success! Record the copy. 6869 Statements.push_back(Copy.takeAs<Expr>()); 6870 } 6871 6872 // \brief Reference to the __builtin_memcpy function. 6873 Expr *BuiltinMemCpyRef = 0; 6874 // \brief Reference to the __builtin_objc_memmove_collectable function. 6875 Expr *CollectableMemCpyRef = 0; 6876 6877 // Assign non-static members. 6878 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6879 FieldEnd = ClassDecl->field_end(); 6880 Field != FieldEnd; ++Field) { 6881 // Check for members of reference type; we can't copy those. 6882 if (Field->getType()->isReferenceType()) { 6883 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6884 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6885 Diag(Field->getLocation(), diag::note_declared_at); 6886 Diag(CurrentLocation, diag::note_member_synthesized_at) 6887 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6888 Invalid = true; 6889 continue; 6890 } 6891 6892 // Check for members of const-qualified, non-class type. 6893 QualType BaseType = Context.getBaseElementType(Field->getType()); 6894 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6895 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6896 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6897 Diag(Field->getLocation(), diag::note_declared_at); 6898 Diag(CurrentLocation, diag::note_member_synthesized_at) 6899 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6900 Invalid = true; 6901 continue; 6902 } 6903 6904 // Suppress assigning zero-width bitfields. 6905 if (const Expr *Width = Field->getBitWidth()) 6906 if (Width->EvaluateAsInt(Context) == 0) 6907 continue; 6908 6909 QualType FieldType = Field->getType().getNonReferenceType(); 6910 if (FieldType->isIncompleteArrayType()) { 6911 assert(ClassDecl->hasFlexibleArrayMember() && 6912 "Incomplete array type is not valid"); 6913 continue; 6914 } 6915 6916 // Build references to the field in the object we're copying from and to. 6917 CXXScopeSpec SS; // Intentionally empty 6918 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6919 LookupMemberName); 6920 MemberLookup.addDecl(*Field); 6921 MemberLookup.resolveKind(); 6922 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6923 Loc, /*IsArrow=*/false, 6924 SS, 0, MemberLookup, 0); 6925 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6926 Loc, /*IsArrow=*/true, 6927 SS, 0, MemberLookup, 0); 6928 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6929 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6930 6931 // If the field should be copied with __builtin_memcpy rather than via 6932 // explicit assignments, do so. This optimization only applies for arrays 6933 // of scalars and arrays of class type with trivial copy-assignment 6934 // operators. 6935 if (FieldType->isArrayType() && 6936 BaseType.hasTrivialCopyAssignment(Context)) { 6937 // Compute the size of the memory buffer to be copied. 6938 QualType SizeType = Context.getSizeType(); 6939 llvm::APInt Size(Context.getTypeSize(SizeType), 6940 Context.getTypeSizeInChars(BaseType).getQuantity()); 6941 for (const ConstantArrayType *Array 6942 = Context.getAsConstantArrayType(FieldType); 6943 Array; 6944 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6945 llvm::APInt ArraySize 6946 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6947 Size *= ArraySize; 6948 } 6949 6950 // Take the address of the field references for "from" and "to". 6951 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6952 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6953 6954 bool NeedsCollectableMemCpy = 6955 (BaseType->isRecordType() && 6956 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6957 6958 if (NeedsCollectableMemCpy) { 6959 if (!CollectableMemCpyRef) { 6960 // Create a reference to the __builtin_objc_memmove_collectable function. 6961 LookupResult R(*this, 6962 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6963 Loc, LookupOrdinaryName); 6964 LookupName(R, TUScope, true); 6965 6966 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6967 if (!CollectableMemCpy) { 6968 // Something went horribly wrong earlier, and we will have 6969 // complained about it. 6970 Invalid = true; 6971 continue; 6972 } 6973 6974 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6975 CollectableMemCpy->getType(), 6976 VK_LValue, Loc, 0).take(); 6977 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6978 } 6979 } 6980 // Create a reference to the __builtin_memcpy builtin function. 6981 else if (!BuiltinMemCpyRef) { 6982 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6983 LookupOrdinaryName); 6984 LookupName(R, TUScope, true); 6985 6986 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6987 if (!BuiltinMemCpy) { 6988 // Something went horribly wrong earlier, and we will have complained 6989 // about it. 6990 Invalid = true; 6991 continue; 6992 } 6993 6994 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6995 BuiltinMemCpy->getType(), 6996 VK_LValue, Loc, 0).take(); 6997 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6998 } 6999 7000 ASTOwningVector<Expr*> CallArgs(*this); 7001 CallArgs.push_back(To.takeAs<Expr>()); 7002 CallArgs.push_back(From.takeAs<Expr>()); 7003 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7004 ExprResult Call = ExprError(); 7005 if (NeedsCollectableMemCpy) 7006 Call = ActOnCallExpr(/*Scope=*/0, 7007 CollectableMemCpyRef, 7008 Loc, move_arg(CallArgs), 7009 Loc); 7010 else 7011 Call = ActOnCallExpr(/*Scope=*/0, 7012 BuiltinMemCpyRef, 7013 Loc, move_arg(CallArgs), 7014 Loc); 7015 7016 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7017 Statements.push_back(Call.takeAs<Expr>()); 7018 continue; 7019 } 7020 7021 // Build the copy of this field. 7022 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7023 To.get(), From.get(), 7024 /*CopyingBaseSubobject=*/false); 7025 if (Copy.isInvalid()) { 7026 Diag(CurrentLocation, diag::note_member_synthesized_at) 7027 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7028 CopyAssignOperator->setInvalidDecl(); 7029 return; 7030 } 7031 7032 // Success! Record the copy. 7033 Statements.push_back(Copy.takeAs<Stmt>()); 7034 } 7035 7036 if (!Invalid) { 7037 // Add a "return *this;" 7038 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7039 7040 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7041 if (Return.isInvalid()) 7042 Invalid = true; 7043 else { 7044 Statements.push_back(Return.takeAs<Stmt>()); 7045 7046 if (Trap.hasErrorOccurred()) { 7047 Diag(CurrentLocation, diag::note_member_synthesized_at) 7048 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7049 Invalid = true; 7050 } 7051 } 7052 } 7053 7054 if (Invalid) { 7055 CopyAssignOperator->setInvalidDecl(); 7056 return; 7057 } 7058 7059 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7060 /*isStmtExpr=*/false); 7061 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7062 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7063 7064 if (ASTMutationListener *L = getASTMutationListener()) { 7065 L->CompletedImplicitDefinition(CopyAssignOperator); 7066 } 7067} 7068 7069std::pair<Sema::ImplicitExceptionSpecification, bool> 7070Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7071 if (ClassDecl->isInvalidDecl()) 7072 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7073 7074 // C++ [class.copy]p5: 7075 // The implicitly-declared copy constructor for a class X will 7076 // have the form 7077 // 7078 // X::X(const X&) 7079 // 7080 // if 7081 // FIXME: It ought to be possible to store this on the record. 7082 bool HasConstCopyConstructor = true; 7083 7084 // -- each direct or virtual base class B of X has a copy 7085 // constructor whose first parameter is of type const B& or 7086 // const volatile B&, and 7087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7088 BaseEnd = ClassDecl->bases_end(); 7089 HasConstCopyConstructor && Base != BaseEnd; 7090 ++Base) { 7091 // Virtual bases are handled below. 7092 if (Base->isVirtual()) 7093 continue; 7094 7095 CXXRecordDecl *BaseClassDecl 7096 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7097 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7098 &HasConstCopyConstructor); 7099 } 7100 7101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7102 BaseEnd = ClassDecl->vbases_end(); 7103 HasConstCopyConstructor && Base != BaseEnd; 7104 ++Base) { 7105 CXXRecordDecl *BaseClassDecl 7106 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7107 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7108 &HasConstCopyConstructor); 7109 } 7110 7111 // -- for all the nonstatic data members of X that are of a 7112 // class type M (or array thereof), each such class type 7113 // has a copy constructor whose first parameter is of type 7114 // const M& or const volatile M&. 7115 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7116 FieldEnd = ClassDecl->field_end(); 7117 HasConstCopyConstructor && Field != FieldEnd; 7118 ++Field) { 7119 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7120 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7121 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 7122 &HasConstCopyConstructor); 7123 } 7124 } 7125 // Otherwise, the implicitly declared copy constructor will have 7126 // the form 7127 // 7128 // X::X(X&) 7129 7130 // C++ [except.spec]p14: 7131 // An implicitly declared special member function (Clause 12) shall have an 7132 // exception-specification. [...] 7133 ImplicitExceptionSpecification ExceptSpec(Context); 7134 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7135 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7136 BaseEnd = ClassDecl->bases_end(); 7137 Base != BaseEnd; 7138 ++Base) { 7139 // Virtual bases are handled below. 7140 if (Base->isVirtual()) 7141 continue; 7142 7143 CXXRecordDecl *BaseClassDecl 7144 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7145 if (CXXConstructorDecl *CopyConstructor = 7146 LookupCopyingConstructor(BaseClassDecl, Quals)) 7147 ExceptSpec.CalledDecl(CopyConstructor); 7148 } 7149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7150 BaseEnd = ClassDecl->vbases_end(); 7151 Base != BaseEnd; 7152 ++Base) { 7153 CXXRecordDecl *BaseClassDecl 7154 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7155 if (CXXConstructorDecl *CopyConstructor = 7156 LookupCopyingConstructor(BaseClassDecl, Quals)) 7157 ExceptSpec.CalledDecl(CopyConstructor); 7158 } 7159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7160 FieldEnd = ClassDecl->field_end(); 7161 Field != FieldEnd; 7162 ++Field) { 7163 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7165 if (CXXConstructorDecl *CopyConstructor = 7166 LookupCopyingConstructor(FieldClassDecl, Quals)) 7167 ExceptSpec.CalledDecl(CopyConstructor); 7168 } 7169 } 7170 7171 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7172} 7173 7174CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7175 CXXRecordDecl *ClassDecl) { 7176 // C++ [class.copy]p4: 7177 // If the class definition does not explicitly declare a copy 7178 // constructor, one is declared implicitly. 7179 7180 ImplicitExceptionSpecification Spec(Context); 7181 bool Const; 7182 llvm::tie(Spec, Const) = 7183 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7184 7185 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7186 QualType ArgType = ClassType; 7187 if (Const) 7188 ArgType = ArgType.withConst(); 7189 ArgType = Context.getLValueReferenceType(ArgType); 7190 7191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7192 7193 DeclarationName Name 7194 = Context.DeclarationNames.getCXXConstructorName( 7195 Context.getCanonicalType(ClassType)); 7196 SourceLocation ClassLoc = ClassDecl->getLocation(); 7197 DeclarationNameInfo NameInfo(Name, ClassLoc); 7198 7199 // An implicitly-declared copy constructor is an inline public 7200 // member of its class. 7201 CXXConstructorDecl *CopyConstructor 7202 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7203 Context.getFunctionType(Context.VoidTy, 7204 &ArgType, 1, EPI), 7205 /*TInfo=*/0, 7206 /*isExplicit=*/false, 7207 /*isInline=*/true, 7208 /*isImplicitlyDeclared=*/true); 7209 CopyConstructor->setAccess(AS_public); 7210 CopyConstructor->setDefaulted(); 7211 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7212 7213 // Note that we have declared this constructor. 7214 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7215 7216 // Add the parameter to the constructor. 7217 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7218 ClassLoc, ClassLoc, 7219 /*IdentifierInfo=*/0, 7220 ArgType, /*TInfo=*/0, 7221 SC_None, 7222 SC_None, 0); 7223 CopyConstructor->setParams(&FromParam, 1); 7224 7225 if (Scope *S = getScopeForContext(ClassDecl)) 7226 PushOnScopeChains(CopyConstructor, S, false); 7227 ClassDecl->addDecl(CopyConstructor); 7228 7229 // C++0x [class.copy]p7: 7230 // ... If the class definition declares a move constructor or move 7231 // assignment operator, the implicitly declared constructor is defined as 7232 // deleted; ... 7233 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7234 ClassDecl->hasUserDeclaredMoveAssignment() || 7235 ShouldDeleteCopyConstructor(CopyConstructor)) 7236 CopyConstructor->setDeletedAsWritten(); 7237 7238 return CopyConstructor; 7239} 7240 7241void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7242 CXXConstructorDecl *CopyConstructor) { 7243 assert((CopyConstructor->isDefaulted() && 7244 CopyConstructor->isCopyConstructor() && 7245 !CopyConstructor->doesThisDeclarationHaveABody()) && 7246 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7247 7248 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7249 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7250 7251 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7252 DiagnosticErrorTrap Trap(Diags); 7253 7254 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7255 Trap.hasErrorOccurred()) { 7256 Diag(CurrentLocation, diag::note_member_synthesized_at) 7257 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7258 CopyConstructor->setInvalidDecl(); 7259 } else { 7260 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7261 CopyConstructor->getLocation(), 7262 MultiStmtArg(*this, 0, 0), 7263 /*isStmtExpr=*/false) 7264 .takeAs<Stmt>()); 7265 } 7266 7267 CopyConstructor->setUsed(); 7268 7269 if (ASTMutationListener *L = getASTMutationListener()) { 7270 L->CompletedImplicitDefinition(CopyConstructor); 7271 } 7272} 7273 7274ExprResult 7275Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7276 CXXConstructorDecl *Constructor, 7277 MultiExprArg ExprArgs, 7278 bool RequiresZeroInit, 7279 unsigned ConstructKind, 7280 SourceRange ParenRange) { 7281 bool Elidable = false; 7282 7283 // C++0x [class.copy]p34: 7284 // When certain criteria are met, an implementation is allowed to 7285 // omit the copy/move construction of a class object, even if the 7286 // copy/move constructor and/or destructor for the object have 7287 // side effects. [...] 7288 // - when a temporary class object that has not been bound to a 7289 // reference (12.2) would be copied/moved to a class object 7290 // with the same cv-unqualified type, the copy/move operation 7291 // can be omitted by constructing the temporary object 7292 // directly into the target of the omitted copy/move 7293 if (ConstructKind == CXXConstructExpr::CK_Complete && 7294 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7295 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7296 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7297 } 7298 7299 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7300 Elidable, move(ExprArgs), RequiresZeroInit, 7301 ConstructKind, ParenRange); 7302} 7303 7304/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7305/// including handling of its default argument expressions. 7306ExprResult 7307Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7308 CXXConstructorDecl *Constructor, bool Elidable, 7309 MultiExprArg ExprArgs, 7310 bool RequiresZeroInit, 7311 unsigned ConstructKind, 7312 SourceRange ParenRange) { 7313 unsigned NumExprs = ExprArgs.size(); 7314 Expr **Exprs = (Expr **)ExprArgs.release(); 7315 7316 for (specific_attr_iterator<NonNullAttr> 7317 i = Constructor->specific_attr_begin<NonNullAttr>(), 7318 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7319 const NonNullAttr *NonNull = *i; 7320 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7321 } 7322 7323 MarkDeclarationReferenced(ConstructLoc, Constructor); 7324 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7325 Constructor, Elidable, Exprs, NumExprs, 7326 RequiresZeroInit, 7327 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7328 ParenRange)); 7329} 7330 7331bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7332 CXXConstructorDecl *Constructor, 7333 MultiExprArg Exprs) { 7334 // FIXME: Provide the correct paren SourceRange when available. 7335 ExprResult TempResult = 7336 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7337 move(Exprs), false, CXXConstructExpr::CK_Complete, 7338 SourceRange()); 7339 if (TempResult.isInvalid()) 7340 return true; 7341 7342 Expr *Temp = TempResult.takeAs<Expr>(); 7343 CheckImplicitConversions(Temp, VD->getLocation()); 7344 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7345 Temp = MaybeCreateExprWithCleanups(Temp); 7346 VD->setInit(Temp); 7347 7348 return false; 7349} 7350 7351void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7352 if (VD->isInvalidDecl()) return; 7353 7354 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7355 if (ClassDecl->isInvalidDecl()) return; 7356 if (ClassDecl->hasTrivialDestructor()) return; 7357 if (ClassDecl->isDependentContext()) return; 7358 7359 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7360 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7361 CheckDestructorAccess(VD->getLocation(), Destructor, 7362 PDiag(diag::err_access_dtor_var) 7363 << VD->getDeclName() 7364 << VD->getType()); 7365 7366 if (!VD->hasGlobalStorage()) return; 7367 7368 // Emit warning for non-trivial dtor in global scope (a real global, 7369 // class-static, function-static). 7370 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7371 7372 // TODO: this should be re-enabled for static locals by !CXAAtExit 7373 if (!VD->isStaticLocal()) 7374 Diag(VD->getLocation(), diag::warn_global_destructor); 7375} 7376 7377/// AddCXXDirectInitializerToDecl - This action is called immediately after 7378/// ActOnDeclarator, when a C++ direct initializer is present. 7379/// e.g: "int x(1);" 7380void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7381 SourceLocation LParenLoc, 7382 MultiExprArg Exprs, 7383 SourceLocation RParenLoc, 7384 bool TypeMayContainAuto) { 7385 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7386 7387 // If there is no declaration, there was an error parsing it. Just ignore 7388 // the initializer. 7389 if (RealDecl == 0) 7390 return; 7391 7392 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7393 if (!VDecl) { 7394 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7395 RealDecl->setInvalidDecl(); 7396 return; 7397 } 7398 7399 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7400 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7401 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7402 if (Exprs.size() > 1) { 7403 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7404 diag::err_auto_var_init_multiple_expressions) 7405 << VDecl->getDeclName() << VDecl->getType() 7406 << VDecl->getSourceRange(); 7407 RealDecl->setInvalidDecl(); 7408 return; 7409 } 7410 7411 Expr *Init = Exprs.get()[0]; 7412 TypeSourceInfo *DeducedType = 0; 7413 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7414 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7415 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7416 << Init->getSourceRange(); 7417 if (!DeducedType) { 7418 RealDecl->setInvalidDecl(); 7419 return; 7420 } 7421 VDecl->setTypeSourceInfo(DeducedType); 7422 VDecl->setType(DeducedType->getType()); 7423 7424 // In ARC, infer lifetime. 7425 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7426 VDecl->setInvalidDecl(); 7427 7428 // If this is a redeclaration, check that the type we just deduced matches 7429 // the previously declared type. 7430 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7431 MergeVarDeclTypes(VDecl, Old); 7432 } 7433 7434 // We will represent direct-initialization similarly to copy-initialization: 7435 // int x(1); -as-> int x = 1; 7436 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7437 // 7438 // Clients that want to distinguish between the two forms, can check for 7439 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7440 // A major benefit is that clients that don't particularly care about which 7441 // exactly form was it (like the CodeGen) can handle both cases without 7442 // special case code. 7443 7444 // C++ 8.5p11: 7445 // The form of initialization (using parentheses or '=') is generally 7446 // insignificant, but does matter when the entity being initialized has a 7447 // class type. 7448 7449 if (!VDecl->getType()->isDependentType() && 7450 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7451 diag::err_typecheck_decl_incomplete_type)) { 7452 VDecl->setInvalidDecl(); 7453 return; 7454 } 7455 7456 // The variable can not have an abstract class type. 7457 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7458 diag::err_abstract_type_in_decl, 7459 AbstractVariableType)) 7460 VDecl->setInvalidDecl(); 7461 7462 const VarDecl *Def; 7463 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7464 Diag(VDecl->getLocation(), diag::err_redefinition) 7465 << VDecl->getDeclName(); 7466 Diag(Def->getLocation(), diag::note_previous_definition); 7467 VDecl->setInvalidDecl(); 7468 return; 7469 } 7470 7471 // C++ [class.static.data]p4 7472 // If a static data member is of const integral or const 7473 // enumeration type, its declaration in the class definition can 7474 // specify a constant-initializer which shall be an integral 7475 // constant expression (5.19). In that case, the member can appear 7476 // in integral constant expressions. The member shall still be 7477 // defined in a namespace scope if it is used in the program and the 7478 // namespace scope definition shall not contain an initializer. 7479 // 7480 // We already performed a redefinition check above, but for static 7481 // data members we also need to check whether there was an in-class 7482 // declaration with an initializer. 7483 const VarDecl* PrevInit = 0; 7484 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7485 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7486 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7487 return; 7488 } 7489 7490 bool IsDependent = false; 7491 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7492 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7493 VDecl->setInvalidDecl(); 7494 return; 7495 } 7496 7497 if (Exprs.get()[I]->isTypeDependent()) 7498 IsDependent = true; 7499 } 7500 7501 // If either the declaration has a dependent type or if any of the 7502 // expressions is type-dependent, we represent the initialization 7503 // via a ParenListExpr for later use during template instantiation. 7504 if (VDecl->getType()->isDependentType() || IsDependent) { 7505 // Let clients know that initialization was done with a direct initializer. 7506 VDecl->setCXXDirectInitializer(true); 7507 7508 // Store the initialization expressions as a ParenListExpr. 7509 unsigned NumExprs = Exprs.size(); 7510 VDecl->setInit(new (Context) ParenListExpr( 7511 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 7512 VDecl->getType().getNonReferenceType())); 7513 return; 7514 } 7515 7516 // Capture the variable that is being initialized and the style of 7517 // initialization. 7518 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7519 7520 // FIXME: Poor source location information. 7521 InitializationKind Kind 7522 = InitializationKind::CreateDirect(VDecl->getLocation(), 7523 LParenLoc, RParenLoc); 7524 7525 InitializationSequence InitSeq(*this, Entity, Kind, 7526 Exprs.get(), Exprs.size()); 7527 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7528 if (Result.isInvalid()) { 7529 VDecl->setInvalidDecl(); 7530 return; 7531 } 7532 7533 CheckImplicitConversions(Result.get(), LParenLoc); 7534 7535 Result = MaybeCreateExprWithCleanups(Result); 7536 VDecl->setInit(Result.takeAs<Expr>()); 7537 VDecl->setCXXDirectInitializer(true); 7538 7539 CheckCompleteVariableDeclaration(VDecl); 7540} 7541 7542/// \brief Given a constructor and the set of arguments provided for the 7543/// constructor, convert the arguments and add any required default arguments 7544/// to form a proper call to this constructor. 7545/// 7546/// \returns true if an error occurred, false otherwise. 7547bool 7548Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7549 MultiExprArg ArgsPtr, 7550 SourceLocation Loc, 7551 ASTOwningVector<Expr*> &ConvertedArgs) { 7552 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7553 unsigned NumArgs = ArgsPtr.size(); 7554 Expr **Args = (Expr **)ArgsPtr.get(); 7555 7556 const FunctionProtoType *Proto 7557 = Constructor->getType()->getAs<FunctionProtoType>(); 7558 assert(Proto && "Constructor without a prototype?"); 7559 unsigned NumArgsInProto = Proto->getNumArgs(); 7560 7561 // If too few arguments are available, we'll fill in the rest with defaults. 7562 if (NumArgs < NumArgsInProto) 7563 ConvertedArgs.reserve(NumArgsInProto); 7564 else 7565 ConvertedArgs.reserve(NumArgs); 7566 7567 VariadicCallType CallType = 7568 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7569 llvm::SmallVector<Expr *, 8> AllArgs; 7570 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7571 Proto, 0, Args, NumArgs, AllArgs, 7572 CallType); 7573 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7574 ConvertedArgs.push_back(AllArgs[i]); 7575 return Invalid; 7576} 7577 7578static inline bool 7579CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7580 const FunctionDecl *FnDecl) { 7581 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7582 if (isa<NamespaceDecl>(DC)) { 7583 return SemaRef.Diag(FnDecl->getLocation(), 7584 diag::err_operator_new_delete_declared_in_namespace) 7585 << FnDecl->getDeclName(); 7586 } 7587 7588 if (isa<TranslationUnitDecl>(DC) && 7589 FnDecl->getStorageClass() == SC_Static) { 7590 return SemaRef.Diag(FnDecl->getLocation(), 7591 diag::err_operator_new_delete_declared_static) 7592 << FnDecl->getDeclName(); 7593 } 7594 7595 return false; 7596} 7597 7598static inline bool 7599CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7600 CanQualType ExpectedResultType, 7601 CanQualType ExpectedFirstParamType, 7602 unsigned DependentParamTypeDiag, 7603 unsigned InvalidParamTypeDiag) { 7604 QualType ResultType = 7605 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7606 7607 // Check that the result type is not dependent. 7608 if (ResultType->isDependentType()) 7609 return SemaRef.Diag(FnDecl->getLocation(), 7610 diag::err_operator_new_delete_dependent_result_type) 7611 << FnDecl->getDeclName() << ExpectedResultType; 7612 7613 // Check that the result type is what we expect. 7614 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7615 return SemaRef.Diag(FnDecl->getLocation(), 7616 diag::err_operator_new_delete_invalid_result_type) 7617 << FnDecl->getDeclName() << ExpectedResultType; 7618 7619 // A function template must have at least 2 parameters. 7620 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7621 return SemaRef.Diag(FnDecl->getLocation(), 7622 diag::err_operator_new_delete_template_too_few_parameters) 7623 << FnDecl->getDeclName(); 7624 7625 // The function decl must have at least 1 parameter. 7626 if (FnDecl->getNumParams() == 0) 7627 return SemaRef.Diag(FnDecl->getLocation(), 7628 diag::err_operator_new_delete_too_few_parameters) 7629 << FnDecl->getDeclName(); 7630 7631 // Check the the first parameter type is not dependent. 7632 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7633 if (FirstParamType->isDependentType()) 7634 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7635 << FnDecl->getDeclName() << ExpectedFirstParamType; 7636 7637 // Check that the first parameter type is what we expect. 7638 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7639 ExpectedFirstParamType) 7640 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7641 << FnDecl->getDeclName() << ExpectedFirstParamType; 7642 7643 return false; 7644} 7645 7646static bool 7647CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7648 // C++ [basic.stc.dynamic.allocation]p1: 7649 // A program is ill-formed if an allocation function is declared in a 7650 // namespace scope other than global scope or declared static in global 7651 // scope. 7652 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7653 return true; 7654 7655 CanQualType SizeTy = 7656 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7657 7658 // C++ [basic.stc.dynamic.allocation]p1: 7659 // The return type shall be void*. The first parameter shall have type 7660 // std::size_t. 7661 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7662 SizeTy, 7663 diag::err_operator_new_dependent_param_type, 7664 diag::err_operator_new_param_type)) 7665 return true; 7666 7667 // C++ [basic.stc.dynamic.allocation]p1: 7668 // The first parameter shall not have an associated default argument. 7669 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7670 return SemaRef.Diag(FnDecl->getLocation(), 7671 diag::err_operator_new_default_arg) 7672 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7673 7674 return false; 7675} 7676 7677static bool 7678CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7679 // C++ [basic.stc.dynamic.deallocation]p1: 7680 // A program is ill-formed if deallocation functions are declared in a 7681 // namespace scope other than global scope or declared static in global 7682 // scope. 7683 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7684 return true; 7685 7686 // C++ [basic.stc.dynamic.deallocation]p2: 7687 // Each deallocation function shall return void and its first parameter 7688 // shall be void*. 7689 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7690 SemaRef.Context.VoidPtrTy, 7691 diag::err_operator_delete_dependent_param_type, 7692 diag::err_operator_delete_param_type)) 7693 return true; 7694 7695 return false; 7696} 7697 7698/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7699/// of this overloaded operator is well-formed. If so, returns false; 7700/// otherwise, emits appropriate diagnostics and returns true. 7701bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7702 assert(FnDecl && FnDecl->isOverloadedOperator() && 7703 "Expected an overloaded operator declaration"); 7704 7705 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7706 7707 // C++ [over.oper]p5: 7708 // The allocation and deallocation functions, operator new, 7709 // operator new[], operator delete and operator delete[], are 7710 // described completely in 3.7.3. The attributes and restrictions 7711 // found in the rest of this subclause do not apply to them unless 7712 // explicitly stated in 3.7.3. 7713 if (Op == OO_Delete || Op == OO_Array_Delete) 7714 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7715 7716 if (Op == OO_New || Op == OO_Array_New) 7717 return CheckOperatorNewDeclaration(*this, FnDecl); 7718 7719 // C++ [over.oper]p6: 7720 // An operator function shall either be a non-static member 7721 // function or be a non-member function and have at least one 7722 // parameter whose type is a class, a reference to a class, an 7723 // enumeration, or a reference to an enumeration. 7724 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7725 if (MethodDecl->isStatic()) 7726 return Diag(FnDecl->getLocation(), 7727 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7728 } else { 7729 bool ClassOrEnumParam = false; 7730 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7731 ParamEnd = FnDecl->param_end(); 7732 Param != ParamEnd; ++Param) { 7733 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7734 if (ParamType->isDependentType() || ParamType->isRecordType() || 7735 ParamType->isEnumeralType()) { 7736 ClassOrEnumParam = true; 7737 break; 7738 } 7739 } 7740 7741 if (!ClassOrEnumParam) 7742 return Diag(FnDecl->getLocation(), 7743 diag::err_operator_overload_needs_class_or_enum) 7744 << FnDecl->getDeclName(); 7745 } 7746 7747 // C++ [over.oper]p8: 7748 // An operator function cannot have default arguments (8.3.6), 7749 // except where explicitly stated below. 7750 // 7751 // Only the function-call operator allows default arguments 7752 // (C++ [over.call]p1). 7753 if (Op != OO_Call) { 7754 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7755 Param != FnDecl->param_end(); ++Param) { 7756 if ((*Param)->hasDefaultArg()) 7757 return Diag((*Param)->getLocation(), 7758 diag::err_operator_overload_default_arg) 7759 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7760 } 7761 } 7762 7763 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7764 { false, false, false } 7765#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7766 , { Unary, Binary, MemberOnly } 7767#include "clang/Basic/OperatorKinds.def" 7768 }; 7769 7770 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7771 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7772 bool MustBeMemberOperator = OperatorUses[Op][2]; 7773 7774 // C++ [over.oper]p8: 7775 // [...] Operator functions cannot have more or fewer parameters 7776 // than the number required for the corresponding operator, as 7777 // described in the rest of this subclause. 7778 unsigned NumParams = FnDecl->getNumParams() 7779 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7780 if (Op != OO_Call && 7781 ((NumParams == 1 && !CanBeUnaryOperator) || 7782 (NumParams == 2 && !CanBeBinaryOperator) || 7783 (NumParams < 1) || (NumParams > 2))) { 7784 // We have the wrong number of parameters. 7785 unsigned ErrorKind; 7786 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7787 ErrorKind = 2; // 2 -> unary or binary. 7788 } else if (CanBeUnaryOperator) { 7789 ErrorKind = 0; // 0 -> unary 7790 } else { 7791 assert(CanBeBinaryOperator && 7792 "All non-call overloaded operators are unary or binary!"); 7793 ErrorKind = 1; // 1 -> binary 7794 } 7795 7796 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7797 << FnDecl->getDeclName() << NumParams << ErrorKind; 7798 } 7799 7800 // Overloaded operators other than operator() cannot be variadic. 7801 if (Op != OO_Call && 7802 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7803 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7804 << FnDecl->getDeclName(); 7805 } 7806 7807 // Some operators must be non-static member functions. 7808 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7809 return Diag(FnDecl->getLocation(), 7810 diag::err_operator_overload_must_be_member) 7811 << FnDecl->getDeclName(); 7812 } 7813 7814 // C++ [over.inc]p1: 7815 // The user-defined function called operator++ implements the 7816 // prefix and postfix ++ operator. If this function is a member 7817 // function with no parameters, or a non-member function with one 7818 // parameter of class or enumeration type, it defines the prefix 7819 // increment operator ++ for objects of that type. If the function 7820 // is a member function with one parameter (which shall be of type 7821 // int) or a non-member function with two parameters (the second 7822 // of which shall be of type int), it defines the postfix 7823 // increment operator ++ for objects of that type. 7824 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7825 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7826 bool ParamIsInt = false; 7827 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7828 ParamIsInt = BT->getKind() == BuiltinType::Int; 7829 7830 if (!ParamIsInt) 7831 return Diag(LastParam->getLocation(), 7832 diag::err_operator_overload_post_incdec_must_be_int) 7833 << LastParam->getType() << (Op == OO_MinusMinus); 7834 } 7835 7836 return false; 7837} 7838 7839/// CheckLiteralOperatorDeclaration - Check whether the declaration 7840/// of this literal operator function is well-formed. If so, returns 7841/// false; otherwise, emits appropriate diagnostics and returns true. 7842bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7843 DeclContext *DC = FnDecl->getDeclContext(); 7844 Decl::Kind Kind = DC->getDeclKind(); 7845 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7846 Kind != Decl::LinkageSpec) { 7847 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7848 << FnDecl->getDeclName(); 7849 return true; 7850 } 7851 7852 bool Valid = false; 7853 7854 // template <char...> type operator "" name() is the only valid template 7855 // signature, and the only valid signature with no parameters. 7856 if (FnDecl->param_size() == 0) { 7857 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7858 // Must have only one template parameter 7859 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7860 if (Params->size() == 1) { 7861 NonTypeTemplateParmDecl *PmDecl = 7862 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7863 7864 // The template parameter must be a char parameter pack. 7865 if (PmDecl && PmDecl->isTemplateParameterPack() && 7866 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7867 Valid = true; 7868 } 7869 } 7870 } else { 7871 // Check the first parameter 7872 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7873 7874 QualType T = (*Param)->getType(); 7875 7876 // unsigned long long int, long double, and any character type are allowed 7877 // as the only parameters. 7878 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7879 Context.hasSameType(T, Context.LongDoubleTy) || 7880 Context.hasSameType(T, Context.CharTy) || 7881 Context.hasSameType(T, Context.WCharTy) || 7882 Context.hasSameType(T, Context.Char16Ty) || 7883 Context.hasSameType(T, Context.Char32Ty)) { 7884 if (++Param == FnDecl->param_end()) 7885 Valid = true; 7886 goto FinishedParams; 7887 } 7888 7889 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7890 const PointerType *PT = T->getAs<PointerType>(); 7891 if (!PT) 7892 goto FinishedParams; 7893 T = PT->getPointeeType(); 7894 if (!T.isConstQualified()) 7895 goto FinishedParams; 7896 T = T.getUnqualifiedType(); 7897 7898 // Move on to the second parameter; 7899 ++Param; 7900 7901 // If there is no second parameter, the first must be a const char * 7902 if (Param == FnDecl->param_end()) { 7903 if (Context.hasSameType(T, Context.CharTy)) 7904 Valid = true; 7905 goto FinishedParams; 7906 } 7907 7908 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7909 // are allowed as the first parameter to a two-parameter function 7910 if (!(Context.hasSameType(T, Context.CharTy) || 7911 Context.hasSameType(T, Context.WCharTy) || 7912 Context.hasSameType(T, Context.Char16Ty) || 7913 Context.hasSameType(T, Context.Char32Ty))) 7914 goto FinishedParams; 7915 7916 // The second and final parameter must be an std::size_t 7917 T = (*Param)->getType().getUnqualifiedType(); 7918 if (Context.hasSameType(T, Context.getSizeType()) && 7919 ++Param == FnDecl->param_end()) 7920 Valid = true; 7921 } 7922 7923 // FIXME: This diagnostic is absolutely terrible. 7924FinishedParams: 7925 if (!Valid) { 7926 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7927 << FnDecl->getDeclName(); 7928 return true; 7929 } 7930 7931 return false; 7932} 7933 7934/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7935/// linkage specification, including the language and (if present) 7936/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7937/// the location of the language string literal, which is provided 7938/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7939/// the '{' brace. Otherwise, this linkage specification does not 7940/// have any braces. 7941Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7942 SourceLocation LangLoc, 7943 llvm::StringRef Lang, 7944 SourceLocation LBraceLoc) { 7945 LinkageSpecDecl::LanguageIDs Language; 7946 if (Lang == "\"C\"") 7947 Language = LinkageSpecDecl::lang_c; 7948 else if (Lang == "\"C++\"") 7949 Language = LinkageSpecDecl::lang_cxx; 7950 else { 7951 Diag(LangLoc, diag::err_bad_language); 7952 return 0; 7953 } 7954 7955 // FIXME: Add all the various semantics of linkage specifications 7956 7957 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7958 ExternLoc, LangLoc, Language); 7959 CurContext->addDecl(D); 7960 PushDeclContext(S, D); 7961 return D; 7962} 7963 7964/// ActOnFinishLinkageSpecification - Complete the definition of 7965/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7966/// valid, it's the position of the closing '}' brace in a linkage 7967/// specification that uses braces. 7968Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7969 Decl *LinkageSpec, 7970 SourceLocation RBraceLoc) { 7971 if (LinkageSpec) { 7972 if (RBraceLoc.isValid()) { 7973 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7974 LSDecl->setRBraceLoc(RBraceLoc); 7975 } 7976 PopDeclContext(); 7977 } 7978 return LinkageSpec; 7979} 7980 7981/// \brief Perform semantic analysis for the variable declaration that 7982/// occurs within a C++ catch clause, returning the newly-created 7983/// variable. 7984VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7985 TypeSourceInfo *TInfo, 7986 SourceLocation StartLoc, 7987 SourceLocation Loc, 7988 IdentifierInfo *Name) { 7989 bool Invalid = false; 7990 QualType ExDeclType = TInfo->getType(); 7991 7992 // Arrays and functions decay. 7993 if (ExDeclType->isArrayType()) 7994 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7995 else if (ExDeclType->isFunctionType()) 7996 ExDeclType = Context.getPointerType(ExDeclType); 7997 7998 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7999 // The exception-declaration shall not denote a pointer or reference to an 8000 // incomplete type, other than [cv] void*. 8001 // N2844 forbids rvalue references. 8002 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 8003 Diag(Loc, diag::err_catch_rvalue_ref); 8004 Invalid = true; 8005 } 8006 8007 // GCC allows catching pointers and references to incomplete types 8008 // as an extension; so do we, but we warn by default. 8009 8010 QualType BaseType = ExDeclType; 8011 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8012 unsigned DK = diag::err_catch_incomplete; 8013 bool IncompleteCatchIsInvalid = true; 8014 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8015 BaseType = Ptr->getPointeeType(); 8016 Mode = 1; 8017 DK = diag::ext_catch_incomplete_ptr; 8018 IncompleteCatchIsInvalid = false; 8019 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8020 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8021 BaseType = Ref->getPointeeType(); 8022 Mode = 2; 8023 DK = diag::ext_catch_incomplete_ref; 8024 IncompleteCatchIsInvalid = false; 8025 } 8026 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8027 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8028 IncompleteCatchIsInvalid) 8029 Invalid = true; 8030 8031 if (!Invalid && !ExDeclType->isDependentType() && 8032 RequireNonAbstractType(Loc, ExDeclType, 8033 diag::err_abstract_type_in_decl, 8034 AbstractVariableType)) 8035 Invalid = true; 8036 8037 // Only the non-fragile NeXT runtime currently supports C++ catches 8038 // of ObjC types, and no runtime supports catching ObjC types by value. 8039 if (!Invalid && getLangOptions().ObjC1) { 8040 QualType T = ExDeclType; 8041 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8042 T = RT->getPointeeType(); 8043 8044 if (T->isObjCObjectType()) { 8045 Diag(Loc, diag::err_objc_object_catch); 8046 Invalid = true; 8047 } else if (T->isObjCObjectPointerType()) { 8048 if (!getLangOptions().ObjCNonFragileABI) 8049 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 8050 } 8051 } 8052 8053 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8054 ExDeclType, TInfo, SC_None, SC_None); 8055 ExDecl->setExceptionVariable(true); 8056 8057 if (!Invalid && !ExDeclType->isDependentType()) { 8058 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8059 // C++ [except.handle]p16: 8060 // The object declared in an exception-declaration or, if the 8061 // exception-declaration does not specify a name, a temporary (12.2) is 8062 // copy-initialized (8.5) from the exception object. [...] 8063 // The object is destroyed when the handler exits, after the destruction 8064 // of any automatic objects initialized within the handler. 8065 // 8066 // We just pretend to initialize the object with itself, then make sure 8067 // it can be destroyed later. 8068 QualType initType = ExDeclType; 8069 8070 InitializedEntity entity = 8071 InitializedEntity::InitializeVariable(ExDecl); 8072 InitializationKind initKind = 8073 InitializationKind::CreateCopy(Loc, SourceLocation()); 8074 8075 Expr *opaqueValue = 8076 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8077 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8078 ExprResult result = sequence.Perform(*this, entity, initKind, 8079 MultiExprArg(&opaqueValue, 1)); 8080 if (result.isInvalid()) 8081 Invalid = true; 8082 else { 8083 // If the constructor used was non-trivial, set this as the 8084 // "initializer". 8085 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8086 if (!construct->getConstructor()->isTrivial()) { 8087 Expr *init = MaybeCreateExprWithCleanups(construct); 8088 ExDecl->setInit(init); 8089 } 8090 8091 // And make sure it's destructable. 8092 FinalizeVarWithDestructor(ExDecl, recordType); 8093 } 8094 } 8095 } 8096 8097 if (Invalid) 8098 ExDecl->setInvalidDecl(); 8099 8100 return ExDecl; 8101} 8102 8103/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8104/// handler. 8105Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8106 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8107 bool Invalid = D.isInvalidType(); 8108 8109 // Check for unexpanded parameter packs. 8110 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8111 UPPC_ExceptionType)) { 8112 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8113 D.getIdentifierLoc()); 8114 Invalid = true; 8115 } 8116 8117 IdentifierInfo *II = D.getIdentifier(); 8118 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8119 LookupOrdinaryName, 8120 ForRedeclaration)) { 8121 // The scope should be freshly made just for us. There is just no way 8122 // it contains any previous declaration. 8123 assert(!S->isDeclScope(PrevDecl)); 8124 if (PrevDecl->isTemplateParameter()) { 8125 // Maybe we will complain about the shadowed template parameter. 8126 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8127 } 8128 } 8129 8130 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8131 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8132 << D.getCXXScopeSpec().getRange(); 8133 Invalid = true; 8134 } 8135 8136 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8137 D.getSourceRange().getBegin(), 8138 D.getIdentifierLoc(), 8139 D.getIdentifier()); 8140 if (Invalid) 8141 ExDecl->setInvalidDecl(); 8142 8143 // Add the exception declaration into this scope. 8144 if (II) 8145 PushOnScopeChains(ExDecl, S); 8146 else 8147 CurContext->addDecl(ExDecl); 8148 8149 ProcessDeclAttributes(S, ExDecl, D); 8150 return ExDecl; 8151} 8152 8153Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8154 Expr *AssertExpr, 8155 Expr *AssertMessageExpr_, 8156 SourceLocation RParenLoc) { 8157 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8158 8159 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8160 llvm::APSInt Value(32); 8161 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8162 Diag(StaticAssertLoc, 8163 diag::err_static_assert_expression_is_not_constant) << 8164 AssertExpr->getSourceRange(); 8165 return 0; 8166 } 8167 8168 if (Value == 0) { 8169 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8170 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8171 } 8172 } 8173 8174 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8175 return 0; 8176 8177 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8178 AssertExpr, AssertMessage, RParenLoc); 8179 8180 CurContext->addDecl(Decl); 8181 return Decl; 8182} 8183 8184/// \brief Perform semantic analysis of the given friend type declaration. 8185/// 8186/// \returns A friend declaration that. 8187FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8188 TypeSourceInfo *TSInfo) { 8189 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8190 8191 QualType T = TSInfo->getType(); 8192 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8193 8194 if (!getLangOptions().CPlusPlus0x) { 8195 // C++03 [class.friend]p2: 8196 // An elaborated-type-specifier shall be used in a friend declaration 8197 // for a class.* 8198 // 8199 // * The class-key of the elaborated-type-specifier is required. 8200 if (!ActiveTemplateInstantiations.empty()) { 8201 // Do not complain about the form of friend template types during 8202 // template instantiation; we will already have complained when the 8203 // template was declared. 8204 } else if (!T->isElaboratedTypeSpecifier()) { 8205 // If we evaluated the type to a record type, suggest putting 8206 // a tag in front. 8207 if (const RecordType *RT = T->getAs<RecordType>()) { 8208 RecordDecl *RD = RT->getDecl(); 8209 8210 std::string InsertionText = std::string(" ") + RD->getKindName(); 8211 8212 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8213 << (unsigned) RD->getTagKind() 8214 << T 8215 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8216 InsertionText); 8217 } else { 8218 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8219 << T 8220 << SourceRange(FriendLoc, TypeRange.getEnd()); 8221 } 8222 } else if (T->getAs<EnumType>()) { 8223 Diag(FriendLoc, diag::ext_enum_friend) 8224 << T 8225 << SourceRange(FriendLoc, TypeRange.getEnd()); 8226 } 8227 } 8228 8229 // C++0x [class.friend]p3: 8230 // If the type specifier in a friend declaration designates a (possibly 8231 // cv-qualified) class type, that class is declared as a friend; otherwise, 8232 // the friend declaration is ignored. 8233 8234 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8235 // in [class.friend]p3 that we do not implement. 8236 8237 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8238} 8239 8240/// Handle a friend tag declaration where the scope specifier was 8241/// templated. 8242Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8243 unsigned TagSpec, SourceLocation TagLoc, 8244 CXXScopeSpec &SS, 8245 IdentifierInfo *Name, SourceLocation NameLoc, 8246 AttributeList *Attr, 8247 MultiTemplateParamsArg TempParamLists) { 8248 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8249 8250 bool isExplicitSpecialization = false; 8251 bool Invalid = false; 8252 8253 if (TemplateParameterList *TemplateParams 8254 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8255 TempParamLists.get(), 8256 TempParamLists.size(), 8257 /*friend*/ true, 8258 isExplicitSpecialization, 8259 Invalid)) { 8260 if (TemplateParams->size() > 0) { 8261 // This is a declaration of a class template. 8262 if (Invalid) 8263 return 0; 8264 8265 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8266 SS, Name, NameLoc, Attr, 8267 TemplateParams, AS_public, 8268 TempParamLists.size() - 1, 8269 (TemplateParameterList**) TempParamLists.release()).take(); 8270 } else { 8271 // The "template<>" header is extraneous. 8272 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8273 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8274 isExplicitSpecialization = true; 8275 } 8276 } 8277 8278 if (Invalid) return 0; 8279 8280 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8281 8282 bool isAllExplicitSpecializations = true; 8283 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8284 if (TempParamLists.get()[I]->size()) { 8285 isAllExplicitSpecializations = false; 8286 break; 8287 } 8288 } 8289 8290 // FIXME: don't ignore attributes. 8291 8292 // If it's explicit specializations all the way down, just forget 8293 // about the template header and build an appropriate non-templated 8294 // friend. TODO: for source fidelity, remember the headers. 8295 if (isAllExplicitSpecializations) { 8296 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8297 ElaboratedTypeKeyword Keyword 8298 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8299 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8300 *Name, NameLoc); 8301 if (T.isNull()) 8302 return 0; 8303 8304 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8305 if (isa<DependentNameType>(T)) { 8306 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8307 TL.setKeywordLoc(TagLoc); 8308 TL.setQualifierLoc(QualifierLoc); 8309 TL.setNameLoc(NameLoc); 8310 } else { 8311 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8312 TL.setKeywordLoc(TagLoc); 8313 TL.setQualifierLoc(QualifierLoc); 8314 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8315 } 8316 8317 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8318 TSI, FriendLoc); 8319 Friend->setAccess(AS_public); 8320 CurContext->addDecl(Friend); 8321 return Friend; 8322 } 8323 8324 // Handle the case of a templated-scope friend class. e.g. 8325 // template <class T> class A<T>::B; 8326 // FIXME: we don't support these right now. 8327 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8328 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8329 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8330 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8331 TL.setKeywordLoc(TagLoc); 8332 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8333 TL.setNameLoc(NameLoc); 8334 8335 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8336 TSI, FriendLoc); 8337 Friend->setAccess(AS_public); 8338 Friend->setUnsupportedFriend(true); 8339 CurContext->addDecl(Friend); 8340 return Friend; 8341} 8342 8343 8344/// Handle a friend type declaration. This works in tandem with 8345/// ActOnTag. 8346/// 8347/// Notes on friend class templates: 8348/// 8349/// We generally treat friend class declarations as if they were 8350/// declaring a class. So, for example, the elaborated type specifier 8351/// in a friend declaration is required to obey the restrictions of a 8352/// class-head (i.e. no typedefs in the scope chain), template 8353/// parameters are required to match up with simple template-ids, &c. 8354/// However, unlike when declaring a template specialization, it's 8355/// okay to refer to a template specialization without an empty 8356/// template parameter declaration, e.g. 8357/// friend class A<T>::B<unsigned>; 8358/// We permit this as a special case; if there are any template 8359/// parameters present at all, require proper matching, i.e. 8360/// template <> template <class T> friend class A<int>::B; 8361Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8362 MultiTemplateParamsArg TempParams) { 8363 SourceLocation Loc = DS.getSourceRange().getBegin(); 8364 8365 assert(DS.isFriendSpecified()); 8366 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8367 8368 // Try to convert the decl specifier to a type. This works for 8369 // friend templates because ActOnTag never produces a ClassTemplateDecl 8370 // for a TUK_Friend. 8371 Declarator TheDeclarator(DS, Declarator::MemberContext); 8372 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8373 QualType T = TSI->getType(); 8374 if (TheDeclarator.isInvalidType()) 8375 return 0; 8376 8377 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8378 return 0; 8379 8380 // This is definitely an error in C++98. It's probably meant to 8381 // be forbidden in C++0x, too, but the specification is just 8382 // poorly written. 8383 // 8384 // The problem is with declarations like the following: 8385 // template <T> friend A<T>::foo; 8386 // where deciding whether a class C is a friend or not now hinges 8387 // on whether there exists an instantiation of A that causes 8388 // 'foo' to equal C. There are restrictions on class-heads 8389 // (which we declare (by fiat) elaborated friend declarations to 8390 // be) that makes this tractable. 8391 // 8392 // FIXME: handle "template <> friend class A<T>;", which 8393 // is possibly well-formed? Who even knows? 8394 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8395 Diag(Loc, diag::err_tagless_friend_type_template) 8396 << DS.getSourceRange(); 8397 return 0; 8398 } 8399 8400 // C++98 [class.friend]p1: A friend of a class is a function 8401 // or class that is not a member of the class . . . 8402 // This is fixed in DR77, which just barely didn't make the C++03 8403 // deadline. It's also a very silly restriction that seriously 8404 // affects inner classes and which nobody else seems to implement; 8405 // thus we never diagnose it, not even in -pedantic. 8406 // 8407 // But note that we could warn about it: it's always useless to 8408 // friend one of your own members (it's not, however, worthless to 8409 // friend a member of an arbitrary specialization of your template). 8410 8411 Decl *D; 8412 if (unsigned NumTempParamLists = TempParams.size()) 8413 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8414 NumTempParamLists, 8415 TempParams.release(), 8416 TSI, 8417 DS.getFriendSpecLoc()); 8418 else 8419 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8420 8421 if (!D) 8422 return 0; 8423 8424 D->setAccess(AS_public); 8425 CurContext->addDecl(D); 8426 8427 return D; 8428} 8429 8430Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8431 MultiTemplateParamsArg TemplateParams) { 8432 const DeclSpec &DS = D.getDeclSpec(); 8433 8434 assert(DS.isFriendSpecified()); 8435 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8436 8437 SourceLocation Loc = D.getIdentifierLoc(); 8438 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8439 QualType T = TInfo->getType(); 8440 8441 // C++ [class.friend]p1 8442 // A friend of a class is a function or class.... 8443 // Note that this sees through typedefs, which is intended. 8444 // It *doesn't* see through dependent types, which is correct 8445 // according to [temp.arg.type]p3: 8446 // If a declaration acquires a function type through a 8447 // type dependent on a template-parameter and this causes 8448 // a declaration that does not use the syntactic form of a 8449 // function declarator to have a function type, the program 8450 // is ill-formed. 8451 if (!T->isFunctionType()) { 8452 Diag(Loc, diag::err_unexpected_friend); 8453 8454 // It might be worthwhile to try to recover by creating an 8455 // appropriate declaration. 8456 return 0; 8457 } 8458 8459 // C++ [namespace.memdef]p3 8460 // - If a friend declaration in a non-local class first declares a 8461 // class or function, the friend class or function is a member 8462 // of the innermost enclosing namespace. 8463 // - The name of the friend is not found by simple name lookup 8464 // until a matching declaration is provided in that namespace 8465 // scope (either before or after the class declaration granting 8466 // friendship). 8467 // - If a friend function is called, its name may be found by the 8468 // name lookup that considers functions from namespaces and 8469 // classes associated with the types of the function arguments. 8470 // - When looking for a prior declaration of a class or a function 8471 // declared as a friend, scopes outside the innermost enclosing 8472 // namespace scope are not considered. 8473 8474 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8475 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8476 DeclarationName Name = NameInfo.getName(); 8477 assert(Name); 8478 8479 // Check for unexpanded parameter packs. 8480 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8481 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8482 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8483 return 0; 8484 8485 // The context we found the declaration in, or in which we should 8486 // create the declaration. 8487 DeclContext *DC; 8488 Scope *DCScope = S; 8489 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8490 ForRedeclaration); 8491 8492 // FIXME: there are different rules in local classes 8493 8494 // There are four cases here. 8495 // - There's no scope specifier, in which case we just go to the 8496 // appropriate scope and look for a function or function template 8497 // there as appropriate. 8498 // Recover from invalid scope qualifiers as if they just weren't there. 8499 if (SS.isInvalid() || !SS.isSet()) { 8500 // C++0x [namespace.memdef]p3: 8501 // If the name in a friend declaration is neither qualified nor 8502 // a template-id and the declaration is a function or an 8503 // elaborated-type-specifier, the lookup to determine whether 8504 // the entity has been previously declared shall not consider 8505 // any scopes outside the innermost enclosing namespace. 8506 // C++0x [class.friend]p11: 8507 // If a friend declaration appears in a local class and the name 8508 // specified is an unqualified name, a prior declaration is 8509 // looked up without considering scopes that are outside the 8510 // innermost enclosing non-class scope. For a friend function 8511 // declaration, if there is no prior declaration, the program is 8512 // ill-formed. 8513 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8514 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8515 8516 // Find the appropriate context according to the above. 8517 DC = CurContext; 8518 while (true) { 8519 // Skip class contexts. If someone can cite chapter and verse 8520 // for this behavior, that would be nice --- it's what GCC and 8521 // EDG do, and it seems like a reasonable intent, but the spec 8522 // really only says that checks for unqualified existing 8523 // declarations should stop at the nearest enclosing namespace, 8524 // not that they should only consider the nearest enclosing 8525 // namespace. 8526 while (DC->isRecord()) 8527 DC = DC->getParent(); 8528 8529 LookupQualifiedName(Previous, DC); 8530 8531 // TODO: decide what we think about using declarations. 8532 if (isLocal || !Previous.empty()) 8533 break; 8534 8535 if (isTemplateId) { 8536 if (isa<TranslationUnitDecl>(DC)) break; 8537 } else { 8538 if (DC->isFileContext()) break; 8539 } 8540 DC = DC->getParent(); 8541 } 8542 8543 // C++ [class.friend]p1: A friend of a class is a function or 8544 // class that is not a member of the class . . . 8545 // C++0x changes this for both friend types and functions. 8546 // Most C++ 98 compilers do seem to give an error here, so 8547 // we do, too. 8548 if (!Previous.empty() && DC->Equals(CurContext) 8549 && !getLangOptions().CPlusPlus0x) 8550 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8551 8552 DCScope = getScopeForDeclContext(S, DC); 8553 8554 // - There's a non-dependent scope specifier, in which case we 8555 // compute it and do a previous lookup there for a function 8556 // or function template. 8557 } else if (!SS.getScopeRep()->isDependent()) { 8558 DC = computeDeclContext(SS); 8559 if (!DC) return 0; 8560 8561 if (RequireCompleteDeclContext(SS, DC)) return 0; 8562 8563 LookupQualifiedName(Previous, DC); 8564 8565 // Ignore things found implicitly in the wrong scope. 8566 // TODO: better diagnostics for this case. Suggesting the right 8567 // qualified scope would be nice... 8568 LookupResult::Filter F = Previous.makeFilter(); 8569 while (F.hasNext()) { 8570 NamedDecl *D = F.next(); 8571 if (!DC->InEnclosingNamespaceSetOf( 8572 D->getDeclContext()->getRedeclContext())) 8573 F.erase(); 8574 } 8575 F.done(); 8576 8577 if (Previous.empty()) { 8578 D.setInvalidType(); 8579 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8580 return 0; 8581 } 8582 8583 // C++ [class.friend]p1: A friend of a class is a function or 8584 // class that is not a member of the class . . . 8585 if (DC->Equals(CurContext)) 8586 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8587 8588 // - There's a scope specifier that does not match any template 8589 // parameter lists, in which case we use some arbitrary context, 8590 // create a method or method template, and wait for instantiation. 8591 // - There's a scope specifier that does match some template 8592 // parameter lists, which we don't handle right now. 8593 } else { 8594 DC = CurContext; 8595 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8596 } 8597 8598 if (!DC->isRecord()) { 8599 // This implies that it has to be an operator or function. 8600 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8601 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8602 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8603 Diag(Loc, diag::err_introducing_special_friend) << 8604 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8605 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8606 return 0; 8607 } 8608 } 8609 8610 bool Redeclaration = false; 8611 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8612 move(TemplateParams), 8613 IsDefinition, 8614 Redeclaration); 8615 if (!ND) return 0; 8616 8617 assert(ND->getDeclContext() == DC); 8618 assert(ND->getLexicalDeclContext() == CurContext); 8619 8620 // Add the function declaration to the appropriate lookup tables, 8621 // adjusting the redeclarations list as necessary. We don't 8622 // want to do this yet if the friending class is dependent. 8623 // 8624 // Also update the scope-based lookup if the target context's 8625 // lookup context is in lexical scope. 8626 if (!CurContext->isDependentContext()) { 8627 DC = DC->getRedeclContext(); 8628 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8629 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8630 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8631 } 8632 8633 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8634 D.getIdentifierLoc(), ND, 8635 DS.getFriendSpecLoc()); 8636 FrD->setAccess(AS_public); 8637 CurContext->addDecl(FrD); 8638 8639 if (ND->isInvalidDecl()) 8640 FrD->setInvalidDecl(); 8641 else { 8642 FunctionDecl *FD; 8643 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8644 FD = FTD->getTemplatedDecl(); 8645 else 8646 FD = cast<FunctionDecl>(ND); 8647 8648 // Mark templated-scope function declarations as unsupported. 8649 if (FD->getNumTemplateParameterLists()) 8650 FrD->setUnsupportedFriend(true); 8651 } 8652 8653 return ND; 8654} 8655 8656void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8657 AdjustDeclIfTemplate(Dcl); 8658 8659 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8660 if (!Fn) { 8661 Diag(DelLoc, diag::err_deleted_non_function); 8662 return; 8663 } 8664 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8665 Diag(DelLoc, diag::err_deleted_decl_not_first); 8666 Diag(Prev->getLocation(), diag::note_previous_declaration); 8667 // If the declaration wasn't the first, we delete the function anyway for 8668 // recovery. 8669 } 8670 Fn->setDeletedAsWritten(); 8671} 8672 8673void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8674 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8675 8676 if (MD) { 8677 if (MD->getParent()->isDependentType()) { 8678 MD->setDefaulted(); 8679 MD->setExplicitlyDefaulted(); 8680 return; 8681 } 8682 8683 CXXSpecialMember Member = getSpecialMember(MD); 8684 if (Member == CXXInvalid) { 8685 Diag(DefaultLoc, diag::err_default_special_members); 8686 return; 8687 } 8688 8689 MD->setDefaulted(); 8690 MD->setExplicitlyDefaulted(); 8691 8692 // If this definition appears within the record, do the checking when 8693 // the record is complete. 8694 const FunctionDecl *Primary = MD; 8695 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8696 // Find the uninstantiated declaration that actually had the '= default' 8697 // on it. 8698 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8699 8700 if (Primary == Primary->getCanonicalDecl()) 8701 return; 8702 8703 switch (Member) { 8704 case CXXDefaultConstructor: { 8705 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8706 CheckExplicitlyDefaultedDefaultConstructor(CD); 8707 if (!CD->isInvalidDecl()) 8708 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8709 break; 8710 } 8711 8712 case CXXCopyConstructor: { 8713 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8714 CheckExplicitlyDefaultedCopyConstructor(CD); 8715 if (!CD->isInvalidDecl()) 8716 DefineImplicitCopyConstructor(DefaultLoc, CD); 8717 break; 8718 } 8719 8720 case CXXCopyAssignment: { 8721 CheckExplicitlyDefaultedCopyAssignment(MD); 8722 if (!MD->isInvalidDecl()) 8723 DefineImplicitCopyAssignment(DefaultLoc, MD); 8724 break; 8725 } 8726 8727 case CXXDestructor: { 8728 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8729 CheckExplicitlyDefaultedDestructor(DD); 8730 if (!DD->isInvalidDecl()) 8731 DefineImplicitDestructor(DefaultLoc, DD); 8732 break; 8733 } 8734 8735 case CXXMoveConstructor: 8736 case CXXMoveAssignment: 8737 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8738 break; 8739 8740 default: 8741 // FIXME: Do the rest once we have move functions 8742 break; 8743 } 8744 } else { 8745 Diag(DefaultLoc, diag::err_default_special_members); 8746 } 8747} 8748 8749static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8750 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8751 Stmt *SubStmt = *CI; 8752 if (!SubStmt) 8753 continue; 8754 if (isa<ReturnStmt>(SubStmt)) 8755 Self.Diag(SubStmt->getSourceRange().getBegin(), 8756 diag::err_return_in_constructor_handler); 8757 if (!isa<Expr>(SubStmt)) 8758 SearchForReturnInStmt(Self, SubStmt); 8759 } 8760} 8761 8762void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8763 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8764 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8765 SearchForReturnInStmt(*this, Handler); 8766 } 8767} 8768 8769bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8770 const CXXMethodDecl *Old) { 8771 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8772 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8773 8774 if (Context.hasSameType(NewTy, OldTy) || 8775 NewTy->isDependentType() || OldTy->isDependentType()) 8776 return false; 8777 8778 // Check if the return types are covariant 8779 QualType NewClassTy, OldClassTy; 8780 8781 /// Both types must be pointers or references to classes. 8782 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8783 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8784 NewClassTy = NewPT->getPointeeType(); 8785 OldClassTy = OldPT->getPointeeType(); 8786 } 8787 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8788 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8789 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8790 NewClassTy = NewRT->getPointeeType(); 8791 OldClassTy = OldRT->getPointeeType(); 8792 } 8793 } 8794 } 8795 8796 // The return types aren't either both pointers or references to a class type. 8797 if (NewClassTy.isNull()) { 8798 Diag(New->getLocation(), 8799 diag::err_different_return_type_for_overriding_virtual_function) 8800 << New->getDeclName() << NewTy << OldTy; 8801 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8802 8803 return true; 8804 } 8805 8806 // C++ [class.virtual]p6: 8807 // If the return type of D::f differs from the return type of B::f, the 8808 // class type in the return type of D::f shall be complete at the point of 8809 // declaration of D::f or shall be the class type D. 8810 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8811 if (!RT->isBeingDefined() && 8812 RequireCompleteType(New->getLocation(), NewClassTy, 8813 PDiag(diag::err_covariant_return_incomplete) 8814 << New->getDeclName())) 8815 return true; 8816 } 8817 8818 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8819 // Check if the new class derives from the old class. 8820 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8821 Diag(New->getLocation(), 8822 diag::err_covariant_return_not_derived) 8823 << New->getDeclName() << NewTy << OldTy; 8824 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8825 return true; 8826 } 8827 8828 // Check if we the conversion from derived to base is valid. 8829 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8830 diag::err_covariant_return_inaccessible_base, 8831 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8832 // FIXME: Should this point to the return type? 8833 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8834 // FIXME: this note won't trigger for delayed access control 8835 // diagnostics, and it's impossible to get an undelayed error 8836 // here from access control during the original parse because 8837 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8838 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8839 return true; 8840 } 8841 } 8842 8843 // The qualifiers of the return types must be the same. 8844 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8845 Diag(New->getLocation(), 8846 diag::err_covariant_return_type_different_qualifications) 8847 << New->getDeclName() << NewTy << OldTy; 8848 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8849 return true; 8850 }; 8851 8852 8853 // The new class type must have the same or less qualifiers as the old type. 8854 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8855 Diag(New->getLocation(), 8856 diag::err_covariant_return_type_class_type_more_qualified) 8857 << New->getDeclName() << NewTy << OldTy; 8858 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8859 return true; 8860 }; 8861 8862 return false; 8863} 8864 8865/// \brief Mark the given method pure. 8866/// 8867/// \param Method the method to be marked pure. 8868/// 8869/// \param InitRange the source range that covers the "0" initializer. 8870bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8871 SourceLocation EndLoc = InitRange.getEnd(); 8872 if (EndLoc.isValid()) 8873 Method->setRangeEnd(EndLoc); 8874 8875 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8876 Method->setPure(); 8877 return false; 8878 } 8879 8880 if (!Method->isInvalidDecl()) 8881 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8882 << Method->getDeclName() << InitRange; 8883 return true; 8884} 8885 8886/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8887/// an initializer for the out-of-line declaration 'Dcl'. The scope 8888/// is a fresh scope pushed for just this purpose. 8889/// 8890/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8891/// static data member of class X, names should be looked up in the scope of 8892/// class X. 8893void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8894 // If there is no declaration, there was an error parsing it. 8895 if (D == 0 || D->isInvalidDecl()) return; 8896 8897 // We should only get called for declarations with scope specifiers, like: 8898 // int foo::bar; 8899 assert(D->isOutOfLine()); 8900 EnterDeclaratorContext(S, D->getDeclContext()); 8901} 8902 8903/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8904/// initializer for the out-of-line declaration 'D'. 8905void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8906 // If there is no declaration, there was an error parsing it. 8907 if (D == 0 || D->isInvalidDecl()) return; 8908 8909 assert(D->isOutOfLine()); 8910 ExitDeclaratorContext(S); 8911} 8912 8913/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8914/// C++ if/switch/while/for statement. 8915/// e.g: "if (int x = f()) {...}" 8916DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8917 // C++ 6.4p2: 8918 // The declarator shall not specify a function or an array. 8919 // The type-specifier-seq shall not contain typedef and shall not declare a 8920 // new class or enumeration. 8921 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8922 "Parser allowed 'typedef' as storage class of condition decl."); 8923 8924 Decl *Dcl = ActOnDeclarator(S, D); 8925 if (!Dcl) 8926 return true; 8927 8928 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 8929 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 8930 << D.getSourceRange(); 8931 return true; 8932 } 8933 8934 return Dcl; 8935} 8936 8937void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8938 bool DefinitionRequired) { 8939 // Ignore any vtable uses in unevaluated operands or for classes that do 8940 // not have a vtable. 8941 if (!Class->isDynamicClass() || Class->isDependentContext() || 8942 CurContext->isDependentContext() || 8943 ExprEvalContexts.back().Context == Unevaluated) 8944 return; 8945 8946 // Try to insert this class into the map. 8947 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8948 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8949 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8950 if (!Pos.second) { 8951 // If we already had an entry, check to see if we are promoting this vtable 8952 // to required a definition. If so, we need to reappend to the VTableUses 8953 // list, since we may have already processed the first entry. 8954 if (DefinitionRequired && !Pos.first->second) { 8955 Pos.first->second = true; 8956 } else { 8957 // Otherwise, we can early exit. 8958 return; 8959 } 8960 } 8961 8962 // Local classes need to have their virtual members marked 8963 // immediately. For all other classes, we mark their virtual members 8964 // at the end of the translation unit. 8965 if (Class->isLocalClass()) 8966 MarkVirtualMembersReferenced(Loc, Class); 8967 else 8968 VTableUses.push_back(std::make_pair(Class, Loc)); 8969} 8970 8971bool Sema::DefineUsedVTables() { 8972 if (VTableUses.empty()) 8973 return false; 8974 8975 // Note: The VTableUses vector could grow as a result of marking 8976 // the members of a class as "used", so we check the size each 8977 // time through the loop and prefer indices (with are stable) to 8978 // iterators (which are not). 8979 bool DefinedAnything = false; 8980 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8981 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8982 if (!Class) 8983 continue; 8984 8985 SourceLocation Loc = VTableUses[I].second; 8986 8987 // If this class has a key function, but that key function is 8988 // defined in another translation unit, we don't need to emit the 8989 // vtable even though we're using it. 8990 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8991 if (KeyFunction && !KeyFunction->hasBody()) { 8992 switch (KeyFunction->getTemplateSpecializationKind()) { 8993 case TSK_Undeclared: 8994 case TSK_ExplicitSpecialization: 8995 case TSK_ExplicitInstantiationDeclaration: 8996 // The key function is in another translation unit. 8997 continue; 8998 8999 case TSK_ExplicitInstantiationDefinition: 9000 case TSK_ImplicitInstantiation: 9001 // We will be instantiating the key function. 9002 break; 9003 } 9004 } else if (!KeyFunction) { 9005 // If we have a class with no key function that is the subject 9006 // of an explicit instantiation declaration, suppress the 9007 // vtable; it will live with the explicit instantiation 9008 // definition. 9009 bool IsExplicitInstantiationDeclaration 9010 = Class->getTemplateSpecializationKind() 9011 == TSK_ExplicitInstantiationDeclaration; 9012 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9013 REnd = Class->redecls_end(); 9014 R != REnd; ++R) { 9015 TemplateSpecializationKind TSK 9016 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9017 if (TSK == TSK_ExplicitInstantiationDeclaration) 9018 IsExplicitInstantiationDeclaration = true; 9019 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9020 IsExplicitInstantiationDeclaration = false; 9021 break; 9022 } 9023 } 9024 9025 if (IsExplicitInstantiationDeclaration) 9026 continue; 9027 } 9028 9029 // Mark all of the virtual members of this class as referenced, so 9030 // that we can build a vtable. Then, tell the AST consumer that a 9031 // vtable for this class is required. 9032 DefinedAnything = true; 9033 MarkVirtualMembersReferenced(Loc, Class); 9034 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9035 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9036 9037 // Optionally warn if we're emitting a weak vtable. 9038 if (Class->getLinkage() == ExternalLinkage && 9039 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9040 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9041 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9042 } 9043 } 9044 VTableUses.clear(); 9045 9046 return DefinedAnything; 9047} 9048 9049void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9050 const CXXRecordDecl *RD) { 9051 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9052 e = RD->method_end(); i != e; ++i) { 9053 CXXMethodDecl *MD = *i; 9054 9055 // C++ [basic.def.odr]p2: 9056 // [...] A virtual member function is used if it is not pure. [...] 9057 if (MD->isVirtual() && !MD->isPure()) 9058 MarkDeclarationReferenced(Loc, MD); 9059 } 9060 9061 // Only classes that have virtual bases need a VTT. 9062 if (RD->getNumVBases() == 0) 9063 return; 9064 9065 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9066 e = RD->bases_end(); i != e; ++i) { 9067 const CXXRecordDecl *Base = 9068 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9069 if (Base->getNumVBases() == 0) 9070 continue; 9071 MarkVirtualMembersReferenced(Loc, Base); 9072 } 9073} 9074 9075/// SetIvarInitializers - This routine builds initialization ASTs for the 9076/// Objective-C implementation whose ivars need be initialized. 9077void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9078 if (!getLangOptions().CPlusPlus) 9079 return; 9080 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9081 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9082 CollectIvarsToConstructOrDestruct(OID, ivars); 9083 if (ivars.empty()) 9084 return; 9085 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9086 for (unsigned i = 0; i < ivars.size(); i++) { 9087 FieldDecl *Field = ivars[i]; 9088 if (Field->isInvalidDecl()) 9089 continue; 9090 9091 CXXCtorInitializer *Member; 9092 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9093 InitializationKind InitKind = 9094 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9095 9096 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9097 ExprResult MemberInit = 9098 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9099 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9100 // Note, MemberInit could actually come back empty if no initialization 9101 // is required (e.g., because it would call a trivial default constructor) 9102 if (!MemberInit.get() || MemberInit.isInvalid()) 9103 continue; 9104 9105 Member = 9106 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9107 SourceLocation(), 9108 MemberInit.takeAs<Expr>(), 9109 SourceLocation()); 9110 AllToInit.push_back(Member); 9111 9112 // Be sure that the destructor is accessible and is marked as referenced. 9113 if (const RecordType *RecordTy 9114 = Context.getBaseElementType(Field->getType()) 9115 ->getAs<RecordType>()) { 9116 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9117 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9118 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9119 CheckDestructorAccess(Field->getLocation(), Destructor, 9120 PDiag(diag::err_access_dtor_ivar) 9121 << Context.getBaseElementType(Field->getType())); 9122 } 9123 } 9124 } 9125 ObjCImplementation->setIvarInitializers(Context, 9126 AllToInit.data(), AllToInit.size()); 9127 } 9128} 9129 9130static 9131void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9132 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9133 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9134 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9135 Sema &S) { 9136 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9137 CE = Current.end(); 9138 if (Ctor->isInvalidDecl()) 9139 return; 9140 9141 const FunctionDecl *FNTarget = 0; 9142 CXXConstructorDecl *Target; 9143 9144 // We ignore the result here since if we don't have a body, Target will be 9145 // null below. 9146 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9147 Target 9148= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9149 9150 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9151 // Avoid dereferencing a null pointer here. 9152 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9153 9154 if (!Current.insert(Canonical)) 9155 return; 9156 9157 // We know that beyond here, we aren't chaining into a cycle. 9158 if (!Target || !Target->isDelegatingConstructor() || 9159 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9160 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9161 Valid.insert(*CI); 9162 Current.clear(); 9163 // We've hit a cycle. 9164 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9165 Current.count(TCanonical)) { 9166 // If we haven't diagnosed this cycle yet, do so now. 9167 if (!Invalid.count(TCanonical)) { 9168 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9169 diag::warn_delegating_ctor_cycle) 9170 << Ctor; 9171 9172 // Don't add a note for a function delegating directo to itself. 9173 if (TCanonical != Canonical) 9174 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9175 9176 CXXConstructorDecl *C = Target; 9177 while (C->getCanonicalDecl() != Canonical) { 9178 (void)C->getTargetConstructor()->hasBody(FNTarget); 9179 assert(FNTarget && "Ctor cycle through bodiless function"); 9180 9181 C 9182 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9183 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9184 } 9185 } 9186 9187 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9188 Invalid.insert(*CI); 9189 Current.clear(); 9190 } else { 9191 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9192 } 9193} 9194 9195 9196void Sema::CheckDelegatingCtorCycles() { 9197 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9198 9199 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9200 CE = Current.end(); 9201 9202 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9203 I = DelegatingCtorDecls.begin(), 9204 E = DelegatingCtorDecls.end(); 9205 I != E; ++I) { 9206 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9207 } 9208 9209 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9210 (*CI)->setInvalidDecl(); 9211} 9212