SemaDeclCXX.cpp revision 136da1c4320156fe8924139f58fbeed2e32cc6e8
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 = 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, and after 1238/// instantiating an in-class initializer in a class template. Such actions 1239/// are deferred until the class is complete. 1240void 1241Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1242 Expr *InitExpr) { 1243 FieldDecl *FD = cast<FieldDecl>(D); 1244 1245 if (!InitExpr) { 1246 FD->setInvalidDecl(); 1247 FD->removeInClassInitializer(); 1248 return; 1249 } 1250 1251 ExprResult Init = InitExpr; 1252 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1253 // FIXME: if there is no EqualLoc, this is list-initialization. 1254 Init = PerformCopyInitialization( 1255 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1256 if (Init.isInvalid()) { 1257 FD->setInvalidDecl(); 1258 return; 1259 } 1260 1261 CheckImplicitConversions(Init.get(), EqualLoc); 1262 } 1263 1264 // C++0x [class.base.init]p7: 1265 // The initialization of each base and member constitutes a 1266 // full-expression. 1267 Init = MaybeCreateExprWithCleanups(Init); 1268 if (Init.isInvalid()) { 1269 FD->setInvalidDecl(); 1270 return; 1271 } 1272 1273 InitExpr = Init.release(); 1274 1275 FD->setInClassInitializer(InitExpr); 1276} 1277 1278/// \brief Find the direct and/or virtual base specifiers that 1279/// correspond to the given base type, for use in base initialization 1280/// within a constructor. 1281static bool FindBaseInitializer(Sema &SemaRef, 1282 CXXRecordDecl *ClassDecl, 1283 QualType BaseType, 1284 const CXXBaseSpecifier *&DirectBaseSpec, 1285 const CXXBaseSpecifier *&VirtualBaseSpec) { 1286 // First, check for a direct base class. 1287 DirectBaseSpec = 0; 1288 for (CXXRecordDecl::base_class_const_iterator Base 1289 = ClassDecl->bases_begin(); 1290 Base != ClassDecl->bases_end(); ++Base) { 1291 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1292 // We found a direct base of this type. That's what we're 1293 // initializing. 1294 DirectBaseSpec = &*Base; 1295 break; 1296 } 1297 } 1298 1299 // Check for a virtual base class. 1300 // FIXME: We might be able to short-circuit this if we know in advance that 1301 // there are no virtual bases. 1302 VirtualBaseSpec = 0; 1303 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1304 // We haven't found a base yet; search the class hierarchy for a 1305 // virtual base class. 1306 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1307 /*DetectVirtual=*/false); 1308 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1309 BaseType, Paths)) { 1310 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1311 Path != Paths.end(); ++Path) { 1312 if (Path->back().Base->isVirtual()) { 1313 VirtualBaseSpec = Path->back().Base; 1314 break; 1315 } 1316 } 1317 } 1318 } 1319 1320 return DirectBaseSpec || VirtualBaseSpec; 1321} 1322 1323/// ActOnMemInitializer - Handle a C++ member initializer. 1324MemInitResult 1325Sema::ActOnMemInitializer(Decl *ConstructorD, 1326 Scope *S, 1327 CXXScopeSpec &SS, 1328 IdentifierInfo *MemberOrBase, 1329 ParsedType TemplateTypeTy, 1330 SourceLocation IdLoc, 1331 SourceLocation LParenLoc, 1332 ExprTy **Args, unsigned NumArgs, 1333 SourceLocation RParenLoc, 1334 SourceLocation EllipsisLoc) { 1335 if (!ConstructorD) 1336 return true; 1337 1338 AdjustDeclIfTemplate(ConstructorD); 1339 1340 CXXConstructorDecl *Constructor 1341 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1342 if (!Constructor) { 1343 // The user wrote a constructor initializer on a function that is 1344 // not a C++ constructor. Ignore the error for now, because we may 1345 // have more member initializers coming; we'll diagnose it just 1346 // once in ActOnMemInitializers. 1347 return true; 1348 } 1349 1350 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1351 1352 // C++ [class.base.init]p2: 1353 // Names in a mem-initializer-id are looked up in the scope of the 1354 // constructor's class and, if not found in that scope, are looked 1355 // up in the scope containing the constructor's definition. 1356 // [Note: if the constructor's class contains a member with the 1357 // same name as a direct or virtual base class of the class, a 1358 // mem-initializer-id naming the member or base class and composed 1359 // of a single identifier refers to the class member. A 1360 // mem-initializer-id for the hidden base class may be specified 1361 // using a qualified name. ] 1362 if (!SS.getScopeRep() && !TemplateTypeTy) { 1363 // Look for a member, first. 1364 FieldDecl *Member = 0; 1365 DeclContext::lookup_result Result 1366 = ClassDecl->lookup(MemberOrBase); 1367 if (Result.first != Result.second) { 1368 Member = dyn_cast<FieldDecl>(*Result.first); 1369 1370 if (Member) { 1371 if (EllipsisLoc.isValid()) 1372 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1373 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1374 1375 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1376 LParenLoc, RParenLoc); 1377 } 1378 1379 // Handle anonymous union case. 1380 if (IndirectFieldDecl* IndirectField 1381 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1382 if (EllipsisLoc.isValid()) 1383 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1384 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1385 1386 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1387 NumArgs, IdLoc, 1388 LParenLoc, RParenLoc); 1389 } 1390 } 1391 } 1392 // It didn't name a member, so see if it names a class. 1393 QualType BaseType; 1394 TypeSourceInfo *TInfo = 0; 1395 1396 if (TemplateTypeTy) { 1397 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1398 } else { 1399 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1400 LookupParsedName(R, S, &SS); 1401 1402 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1403 if (!TyD) { 1404 if (R.isAmbiguous()) return true; 1405 1406 // We don't want access-control diagnostics here. 1407 R.suppressDiagnostics(); 1408 1409 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1410 bool NotUnknownSpecialization = false; 1411 DeclContext *DC = computeDeclContext(SS, false); 1412 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1413 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1414 1415 if (!NotUnknownSpecialization) { 1416 // When the scope specifier can refer to a member of an unknown 1417 // specialization, we take it as a type name. 1418 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1419 SS.getWithLocInContext(Context), 1420 *MemberOrBase, IdLoc); 1421 if (BaseType.isNull()) 1422 return true; 1423 1424 R.clear(); 1425 R.setLookupName(MemberOrBase); 1426 } 1427 } 1428 1429 // If no results were found, try to correct typos. 1430 TypoCorrection Corr; 1431 if (R.empty() && BaseType.isNull() && 1432 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1433 ClassDecl, false, CTC_NoKeywords))) { 1434 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1435 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1436 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1437 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1438 // We have found a non-static data member with a similar 1439 // name to what was typed; complain and initialize that 1440 // member. 1441 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1442 << MemberOrBase << true << CorrectedQuotedStr 1443 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1444 Diag(Member->getLocation(), diag::note_previous_decl) 1445 << CorrectedQuotedStr; 1446 1447 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1448 LParenLoc, RParenLoc); 1449 } 1450 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1451 const CXXBaseSpecifier *DirectBaseSpec; 1452 const CXXBaseSpecifier *VirtualBaseSpec; 1453 if (FindBaseInitializer(*this, ClassDecl, 1454 Context.getTypeDeclType(Type), 1455 DirectBaseSpec, VirtualBaseSpec)) { 1456 // We have found a direct or virtual base class with a 1457 // similar name to what was typed; complain and initialize 1458 // that base class. 1459 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1460 << MemberOrBase << false << CorrectedQuotedStr 1461 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1462 1463 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1464 : VirtualBaseSpec; 1465 Diag(BaseSpec->getSourceRange().getBegin(), 1466 diag::note_base_class_specified_here) 1467 << BaseSpec->getType() 1468 << BaseSpec->getSourceRange(); 1469 1470 TyD = Type; 1471 } 1472 } 1473 } 1474 1475 if (!TyD && BaseType.isNull()) { 1476 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1477 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1478 return true; 1479 } 1480 } 1481 1482 if (BaseType.isNull()) { 1483 BaseType = Context.getTypeDeclType(TyD); 1484 if (SS.isSet()) { 1485 NestedNameSpecifier *Qualifier = 1486 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1487 1488 // FIXME: preserve source range information 1489 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1490 } 1491 } 1492 } 1493 1494 if (!TInfo) 1495 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1496 1497 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1498 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1499} 1500 1501/// Checks an initializer expression for use of uninitialized fields, such as 1502/// containing the field that is being initialized. Returns true if there is an 1503/// uninitialized field was used an updates the SourceLocation parameter; false 1504/// otherwise. 1505static bool InitExprContainsUninitializedFields(const Stmt *S, 1506 const ValueDecl *LhsField, 1507 SourceLocation *L) { 1508 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1509 1510 if (isa<CallExpr>(S)) { 1511 // Do not descend into function calls or constructors, as the use 1512 // of an uninitialized field may be valid. One would have to inspect 1513 // the contents of the function/ctor to determine if it is safe or not. 1514 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1515 // may be safe, depending on what the function/ctor does. 1516 return false; 1517 } 1518 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1519 const NamedDecl *RhsField = ME->getMemberDecl(); 1520 1521 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1522 // The member expression points to a static data member. 1523 assert(VD->isStaticDataMember() && 1524 "Member points to non-static data member!"); 1525 (void)VD; 1526 return false; 1527 } 1528 1529 if (isa<EnumConstantDecl>(RhsField)) { 1530 // The member expression points to an enum. 1531 return false; 1532 } 1533 1534 if (RhsField == LhsField) { 1535 // Initializing a field with itself. Throw a warning. 1536 // But wait; there are exceptions! 1537 // Exception #1: The field may not belong to this record. 1538 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1539 const Expr *base = ME->getBase(); 1540 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1541 // Even though the field matches, it does not belong to this record. 1542 return false; 1543 } 1544 // None of the exceptions triggered; return true to indicate an 1545 // uninitialized field was used. 1546 *L = ME->getMemberLoc(); 1547 return true; 1548 } 1549 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1550 // sizeof/alignof doesn't reference contents, do not warn. 1551 return false; 1552 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1553 // address-of doesn't reference contents (the pointer may be dereferenced 1554 // in the same expression but it would be rare; and weird). 1555 if (UOE->getOpcode() == UO_AddrOf) 1556 return false; 1557 } 1558 for (Stmt::const_child_range it = S->children(); it; ++it) { 1559 if (!*it) { 1560 // An expression such as 'member(arg ?: "")' may trigger this. 1561 continue; 1562 } 1563 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1564 return true; 1565 } 1566 return false; 1567} 1568 1569MemInitResult 1570Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1571 unsigned NumArgs, SourceLocation IdLoc, 1572 SourceLocation LParenLoc, 1573 SourceLocation RParenLoc) { 1574 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1575 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1576 assert((DirectMember || IndirectMember) && 1577 "Member must be a FieldDecl or IndirectFieldDecl"); 1578 1579 if (Member->isInvalidDecl()) 1580 return true; 1581 1582 // Diagnose value-uses of fields to initialize themselves, e.g. 1583 // foo(foo) 1584 // where foo is not also a parameter to the constructor. 1585 // TODO: implement -Wuninitialized and fold this into that framework. 1586 for (unsigned i = 0; i < NumArgs; ++i) { 1587 SourceLocation L; 1588 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1589 // FIXME: Return true in the case when other fields are used before being 1590 // uninitialized. For example, let this field be the i'th field. When 1591 // initializing the i'th field, throw a warning if any of the >= i'th 1592 // fields are used, as they are not yet initialized. 1593 // Right now we are only handling the case where the i'th field uses 1594 // itself in its initializer. 1595 Diag(L, diag::warn_field_is_uninit); 1596 } 1597 } 1598 1599 bool HasDependentArg = false; 1600 for (unsigned i = 0; i < NumArgs; i++) 1601 HasDependentArg |= Args[i]->isTypeDependent(); 1602 1603 Expr *Init; 1604 if (Member->getType()->isDependentType() || HasDependentArg) { 1605 // Can't check initialization for a member of dependent type or when 1606 // any of the arguments are type-dependent expressions. 1607 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1608 RParenLoc, 1609 Member->getType().getNonReferenceType()); 1610 1611 DiscardCleanupsInEvaluationContext(); 1612 } else { 1613 // Initialize the member. 1614 InitializedEntity MemberEntity = 1615 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1616 : InitializedEntity::InitializeMember(IndirectMember, 0); 1617 InitializationKind Kind = 1618 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1619 1620 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1621 1622 ExprResult MemberInit = 1623 InitSeq.Perform(*this, MemberEntity, Kind, 1624 MultiExprArg(*this, Args, NumArgs), 0); 1625 if (MemberInit.isInvalid()) 1626 return true; 1627 1628 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1629 1630 // C++0x [class.base.init]p7: 1631 // The initialization of each base and member constitutes a 1632 // full-expression. 1633 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1634 if (MemberInit.isInvalid()) 1635 return true; 1636 1637 // If we are in a dependent context, template instantiation will 1638 // perform this type-checking again. Just save the arguments that we 1639 // received in a ParenListExpr. 1640 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1641 // of the information that we have about the member 1642 // initializer. However, deconstructing the ASTs is a dicey process, 1643 // and this approach is far more likely to get the corner cases right. 1644 if (CurContext->isDependentContext()) 1645 Init = new (Context) ParenListExpr( 1646 Context, LParenLoc, Args, NumArgs, RParenLoc, 1647 Member->getType().getNonReferenceType()); 1648 else 1649 Init = MemberInit.get(); 1650 } 1651 1652 if (DirectMember) { 1653 return new (Context) CXXCtorInitializer(Context, DirectMember, 1654 IdLoc, LParenLoc, Init, 1655 RParenLoc); 1656 } else { 1657 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1658 IdLoc, LParenLoc, Init, 1659 RParenLoc); 1660 } 1661} 1662 1663MemInitResult 1664Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1665 Expr **Args, unsigned NumArgs, 1666 SourceLocation NameLoc, 1667 SourceLocation LParenLoc, 1668 SourceLocation RParenLoc, 1669 CXXRecordDecl *ClassDecl) { 1670 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1671 if (!LangOpts.CPlusPlus0x) 1672 return Diag(Loc, diag::err_delegation_0x_only) 1673 << TInfo->getTypeLoc().getLocalSourceRange(); 1674 1675 // Initialize the object. 1676 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1677 QualType(ClassDecl->getTypeForDecl(), 0)); 1678 InitializationKind Kind = 1679 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1680 1681 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1682 1683 ExprResult DelegationInit = 1684 InitSeq.Perform(*this, DelegationEntity, Kind, 1685 MultiExprArg(*this, Args, NumArgs), 0); 1686 if (DelegationInit.isInvalid()) 1687 return true; 1688 1689 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1690 CXXConstructorDecl *Constructor 1691 = ConExpr->getConstructor(); 1692 assert(Constructor && "Delegating constructor with no target?"); 1693 1694 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1695 1696 // C++0x [class.base.init]p7: 1697 // The initialization of each base and member constitutes a 1698 // full-expression. 1699 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1700 if (DelegationInit.isInvalid()) 1701 return true; 1702 1703 assert(!CurContext->isDependentContext()); 1704 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1705 DelegationInit.takeAs<Expr>(), 1706 RParenLoc); 1707} 1708 1709MemInitResult 1710Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1711 Expr **Args, unsigned NumArgs, 1712 SourceLocation LParenLoc, SourceLocation RParenLoc, 1713 CXXRecordDecl *ClassDecl, 1714 SourceLocation EllipsisLoc) { 1715 bool HasDependentArg = false; 1716 for (unsigned i = 0; i < NumArgs; i++) 1717 HasDependentArg |= Args[i]->isTypeDependent(); 1718 1719 SourceLocation BaseLoc 1720 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1721 1722 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1723 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1724 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1725 1726 // C++ [class.base.init]p2: 1727 // [...] Unless the mem-initializer-id names a nonstatic data 1728 // member of the constructor's class or a direct or virtual base 1729 // of that class, the mem-initializer is ill-formed. A 1730 // mem-initializer-list can initialize a base class using any 1731 // name that denotes that base class type. 1732 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1733 1734 if (EllipsisLoc.isValid()) { 1735 // This is a pack expansion. 1736 if (!BaseType->containsUnexpandedParameterPack()) { 1737 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1738 << SourceRange(BaseLoc, RParenLoc); 1739 1740 EllipsisLoc = SourceLocation(); 1741 } 1742 } else { 1743 // Check for any unexpanded parameter packs. 1744 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1745 return true; 1746 1747 for (unsigned I = 0; I != NumArgs; ++I) 1748 if (DiagnoseUnexpandedParameterPack(Args[I])) 1749 return true; 1750 } 1751 1752 // Check for direct and virtual base classes. 1753 const CXXBaseSpecifier *DirectBaseSpec = 0; 1754 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1755 if (!Dependent) { 1756 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1757 BaseType)) 1758 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1759 LParenLoc, RParenLoc, ClassDecl); 1760 1761 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1762 VirtualBaseSpec); 1763 1764 // C++ [base.class.init]p2: 1765 // Unless the mem-initializer-id names a nonstatic data member of the 1766 // constructor's class or a direct or virtual base of that class, the 1767 // mem-initializer is ill-formed. 1768 if (!DirectBaseSpec && !VirtualBaseSpec) { 1769 // If the class has any dependent bases, then it's possible that 1770 // one of those types will resolve to the same type as 1771 // BaseType. Therefore, just treat this as a dependent base 1772 // class initialization. FIXME: Should we try to check the 1773 // initialization anyway? It seems odd. 1774 if (ClassDecl->hasAnyDependentBases()) 1775 Dependent = true; 1776 else 1777 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1778 << BaseType << Context.getTypeDeclType(ClassDecl) 1779 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1780 } 1781 } 1782 1783 if (Dependent) { 1784 // Can't check initialization for a base of dependent type or when 1785 // any of the arguments are type-dependent expressions. 1786 ExprResult BaseInit 1787 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1788 RParenLoc, BaseType)); 1789 1790 DiscardCleanupsInEvaluationContext(); 1791 1792 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1793 /*IsVirtual=*/false, 1794 LParenLoc, 1795 BaseInit.takeAs<Expr>(), 1796 RParenLoc, 1797 EllipsisLoc); 1798 } 1799 1800 // C++ [base.class.init]p2: 1801 // If a mem-initializer-id is ambiguous because it designates both 1802 // a direct non-virtual base class and an inherited virtual base 1803 // class, the mem-initializer is ill-formed. 1804 if (DirectBaseSpec && VirtualBaseSpec) 1805 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1806 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1807 1808 CXXBaseSpecifier *BaseSpec 1809 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1810 if (!BaseSpec) 1811 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1812 1813 // Initialize the base. 1814 InitializedEntity BaseEntity = 1815 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1816 InitializationKind Kind = 1817 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1818 1819 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1820 1821 ExprResult BaseInit = 1822 InitSeq.Perform(*this, BaseEntity, Kind, 1823 MultiExprArg(*this, Args, NumArgs), 0); 1824 if (BaseInit.isInvalid()) 1825 return true; 1826 1827 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1828 1829 // C++0x [class.base.init]p7: 1830 // The initialization of each base and member constitutes a 1831 // full-expression. 1832 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1833 if (BaseInit.isInvalid()) 1834 return true; 1835 1836 // If we are in a dependent context, template instantiation will 1837 // perform this type-checking again. Just save the arguments that we 1838 // received in a ParenListExpr. 1839 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1840 // of the information that we have about the base 1841 // initializer. However, deconstructing the ASTs is a dicey process, 1842 // and this approach is far more likely to get the corner cases right. 1843 if (CurContext->isDependentContext()) { 1844 ExprResult Init 1845 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1846 RParenLoc, BaseType)); 1847 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1848 BaseSpec->isVirtual(), 1849 LParenLoc, 1850 Init.takeAs<Expr>(), 1851 RParenLoc, 1852 EllipsisLoc); 1853 } 1854 1855 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1856 BaseSpec->isVirtual(), 1857 LParenLoc, 1858 BaseInit.takeAs<Expr>(), 1859 RParenLoc, 1860 EllipsisLoc); 1861} 1862 1863/// ImplicitInitializerKind - How an implicit base or member initializer should 1864/// initialize its base or member. 1865enum ImplicitInitializerKind { 1866 IIK_Default, 1867 IIK_Copy, 1868 IIK_Move 1869}; 1870 1871static bool 1872BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1873 ImplicitInitializerKind ImplicitInitKind, 1874 CXXBaseSpecifier *BaseSpec, 1875 bool IsInheritedVirtualBase, 1876 CXXCtorInitializer *&CXXBaseInit) { 1877 InitializedEntity InitEntity 1878 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1879 IsInheritedVirtualBase); 1880 1881 ExprResult BaseInit; 1882 1883 switch (ImplicitInitKind) { 1884 case IIK_Default: { 1885 InitializationKind InitKind 1886 = InitializationKind::CreateDefault(Constructor->getLocation()); 1887 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1888 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1889 MultiExprArg(SemaRef, 0, 0)); 1890 break; 1891 } 1892 1893 case IIK_Copy: { 1894 ParmVarDecl *Param = Constructor->getParamDecl(0); 1895 QualType ParamType = Param->getType().getNonReferenceType(); 1896 1897 Expr *CopyCtorArg = 1898 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1899 Constructor->getLocation(), ParamType, 1900 VK_LValue, 0); 1901 1902 // Cast to the base class to avoid ambiguities. 1903 QualType ArgTy = 1904 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1905 ParamType.getQualifiers()); 1906 1907 CXXCastPath BasePath; 1908 BasePath.push_back(BaseSpec); 1909 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1910 CK_UncheckedDerivedToBase, 1911 VK_LValue, &BasePath).take(); 1912 1913 InitializationKind InitKind 1914 = InitializationKind::CreateDirect(Constructor->getLocation(), 1915 SourceLocation(), SourceLocation()); 1916 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1917 &CopyCtorArg, 1); 1918 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1919 MultiExprArg(&CopyCtorArg, 1)); 1920 break; 1921 } 1922 1923 case IIK_Move: 1924 assert(false && "Unhandled initializer kind!"); 1925 } 1926 1927 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1928 if (BaseInit.isInvalid()) 1929 return true; 1930 1931 CXXBaseInit = 1932 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1933 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1934 SourceLocation()), 1935 BaseSpec->isVirtual(), 1936 SourceLocation(), 1937 BaseInit.takeAs<Expr>(), 1938 SourceLocation(), 1939 SourceLocation()); 1940 1941 return false; 1942} 1943 1944static bool 1945BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1946 ImplicitInitializerKind ImplicitInitKind, 1947 FieldDecl *Field, IndirectFieldDecl *Indirect, 1948 CXXCtorInitializer *&CXXMemberInit) { 1949 if (Field->isInvalidDecl()) 1950 return true; 1951 1952 SourceLocation Loc = Constructor->getLocation(); 1953 1954 if (ImplicitInitKind == IIK_Copy) { 1955 ParmVarDecl *Param = Constructor->getParamDecl(0); 1956 QualType ParamType = Param->getType().getNonReferenceType(); 1957 1958 // Suppress copying zero-width bitfields. 1959 if (const Expr *Width = Field->getBitWidth()) 1960 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1961 return false; 1962 1963 Expr *MemberExprBase = 1964 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1965 Loc, ParamType, VK_LValue, 0); 1966 1967 // Build a reference to this field within the parameter. 1968 CXXScopeSpec SS; 1969 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1970 Sema::LookupMemberName); 1971 MemberLookup.addDecl(Indirect? cast<ValueDecl>(Indirect) : cast<ValueDecl>(Field), AS_public); 1972 MemberLookup.resolveKind(); 1973 ExprResult CopyCtorArg 1974 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1975 ParamType, Loc, 1976 /*IsArrow=*/false, 1977 SS, 1978 /*FirstQualifierInScope=*/0, 1979 MemberLookup, 1980 /*TemplateArgs=*/0); 1981 if (CopyCtorArg.isInvalid()) 1982 return true; 1983 1984 // When the field we are copying is an array, create index variables for 1985 // each dimension of the array. We use these index variables to subscript 1986 // the source array, and other clients (e.g., CodeGen) will perform the 1987 // necessary iteration with these index variables. 1988 SmallVector<VarDecl *, 4> IndexVariables; 1989 QualType BaseType = Field->getType(); 1990 QualType SizeType = SemaRef.Context.getSizeType(); 1991 while (const ConstantArrayType *Array 1992 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1993 // Create the iteration variable for this array index. 1994 IdentifierInfo *IterationVarName = 0; 1995 { 1996 llvm::SmallString<8> Str; 1997 llvm::raw_svector_ostream OS(Str); 1998 OS << "__i" << IndexVariables.size(); 1999 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2000 } 2001 VarDecl *IterationVar 2002 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2003 IterationVarName, SizeType, 2004 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2005 SC_None, SC_None); 2006 IndexVariables.push_back(IterationVar); 2007 2008 // Create a reference to the iteration variable. 2009 ExprResult IterationVarRef 2010 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2011 assert(!IterationVarRef.isInvalid() && 2012 "Reference to invented variable cannot fail!"); 2013 2014 // Subscript the array with this iteration variable. 2015 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2016 Loc, 2017 IterationVarRef.take(), 2018 Loc); 2019 if (CopyCtorArg.isInvalid()) 2020 return true; 2021 2022 BaseType = Array->getElementType(); 2023 } 2024 2025 // Construct the entity that we will be initializing. For an array, this 2026 // will be first element in the array, which may require several levels 2027 // of array-subscript entities. 2028 SmallVector<InitializedEntity, 4> Entities; 2029 Entities.reserve(1 + IndexVariables.size()); 2030 if (Indirect) 2031 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2032 else 2033 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2034 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2035 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2036 0, 2037 Entities.back())); 2038 2039 // Direct-initialize to use the copy constructor. 2040 InitializationKind InitKind = 2041 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2042 2043 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2044 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2045 &CopyCtorArgE, 1); 2046 2047 ExprResult MemberInit 2048 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2049 MultiExprArg(&CopyCtorArgE, 1)); 2050 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2051 if (MemberInit.isInvalid()) 2052 return true; 2053 2054 if (Indirect) { 2055 assert(IndexVariables.size() == 0 && 2056 "Indirect field improperly initialized"); 2057 CXXMemberInit 2058 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2059 Loc, Loc, 2060 MemberInit.takeAs<Expr>(), 2061 Loc); 2062 } else 2063 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2064 Loc, MemberInit.takeAs<Expr>(), 2065 Loc, 2066 IndexVariables.data(), 2067 IndexVariables.size()); 2068 return false; 2069 } 2070 2071 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2072 2073 QualType FieldBaseElementType = 2074 SemaRef.Context.getBaseElementType(Field->getType()); 2075 2076 if (FieldBaseElementType->isRecordType()) { 2077 InitializedEntity InitEntity 2078 = Indirect? InitializedEntity::InitializeMember(Indirect) 2079 : InitializedEntity::InitializeMember(Field); 2080 InitializationKind InitKind = 2081 InitializationKind::CreateDefault(Loc); 2082 2083 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2084 ExprResult MemberInit = 2085 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2086 2087 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2088 if (MemberInit.isInvalid()) 2089 return true; 2090 2091 if (Indirect) 2092 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2093 Indirect, Loc, 2094 Loc, 2095 MemberInit.get(), 2096 Loc); 2097 else 2098 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2099 Field, Loc, Loc, 2100 MemberInit.get(), 2101 Loc); 2102 return false; 2103 } 2104 2105 if (!Field->getParent()->isUnion()) { 2106 if (FieldBaseElementType->isReferenceType()) { 2107 SemaRef.Diag(Constructor->getLocation(), 2108 diag::err_uninitialized_member_in_ctor) 2109 << (int)Constructor->isImplicit() 2110 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2111 << 0 << Field->getDeclName(); 2112 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2113 return true; 2114 } 2115 2116 if (FieldBaseElementType.isConstQualified()) { 2117 SemaRef.Diag(Constructor->getLocation(), 2118 diag::err_uninitialized_member_in_ctor) 2119 << (int)Constructor->isImplicit() 2120 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2121 << 1 << Field->getDeclName(); 2122 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2123 return true; 2124 } 2125 } 2126 2127 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2128 FieldBaseElementType->isObjCRetainableType() && 2129 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2130 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2131 // Instant objects: 2132 // Default-initialize Objective-C pointers to NULL. 2133 CXXMemberInit 2134 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2135 Loc, Loc, 2136 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2137 Loc); 2138 return false; 2139 } 2140 2141 // Nothing to initialize. 2142 CXXMemberInit = 0; 2143 return false; 2144} 2145 2146namespace { 2147struct BaseAndFieldInfo { 2148 Sema &S; 2149 CXXConstructorDecl *Ctor; 2150 bool AnyErrorsInInits; 2151 ImplicitInitializerKind IIK; 2152 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2153 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2154 2155 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2156 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2157 // FIXME: Handle implicit move constructors. 2158 if ((Ctor->isImplicit() || Ctor->isDefaulted()) && 2159 Ctor->isCopyConstructor()) 2160 IIK = IIK_Copy; 2161 else 2162 IIK = IIK_Default; 2163 } 2164}; 2165} 2166 2167static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2168 FieldDecl *Field, 2169 IndirectFieldDecl *Indirect = 0) { 2170 2171 // Overwhelmingly common case: we have a direct initializer for this field. 2172 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2173 Info.AllToInit.push_back(Init); 2174 return false; 2175 } 2176 2177 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2178 // has a brace-or-equal-initializer, the entity is initialized as specified 2179 // in [dcl.init]. 2180 if (Field->hasInClassInitializer()) { 2181 CXXCtorInitializer *Init; 2182 if (Indirect) 2183 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2184 SourceLocation(), 2185 SourceLocation(), 0, 2186 SourceLocation()); 2187 else 2188 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2189 SourceLocation(), 2190 SourceLocation(), 0, 2191 SourceLocation()); 2192 Info.AllToInit.push_back(Init); 2193 return false; 2194 } 2195 2196 // Don't try to build an implicit initializer if there were semantic 2197 // errors in any of the initializers (and therefore we might be 2198 // missing some that the user actually wrote). 2199 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2200 return false; 2201 2202 CXXCtorInitializer *Init = 0; 2203 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2204 Indirect, Init)) 2205 return true; 2206 2207 if (Init) 2208 Info.AllToInit.push_back(Init); 2209 2210 return false; 2211} 2212 2213bool 2214Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2215 CXXCtorInitializer *Initializer) { 2216 assert(Initializer->isDelegatingInitializer()); 2217 Constructor->setNumCtorInitializers(1); 2218 CXXCtorInitializer **initializer = 2219 new (Context) CXXCtorInitializer*[1]; 2220 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2221 Constructor->setCtorInitializers(initializer); 2222 2223 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2224 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2225 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2226 } 2227 2228 DelegatingCtorDecls.push_back(Constructor); 2229 2230 return false; 2231} 2232 2233/// \brief Determine whether the given indirect field declaration is somewhere 2234/// within an anonymous union. 2235static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2236 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2237 CEnd = F->chain_end(); 2238 C != CEnd; ++C) 2239 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2240 if (Record->isUnion()) 2241 return true; 2242 2243 return false; 2244} 2245 2246bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2247 CXXCtorInitializer **Initializers, 2248 unsigned NumInitializers, 2249 bool AnyErrors) { 2250 if (Constructor->getDeclContext()->isDependentContext()) { 2251 // Just store the initializers as written, they will be checked during 2252 // instantiation. 2253 if (NumInitializers > 0) { 2254 Constructor->setNumCtorInitializers(NumInitializers); 2255 CXXCtorInitializer **baseOrMemberInitializers = 2256 new (Context) CXXCtorInitializer*[NumInitializers]; 2257 memcpy(baseOrMemberInitializers, Initializers, 2258 NumInitializers * sizeof(CXXCtorInitializer*)); 2259 Constructor->setCtorInitializers(baseOrMemberInitializers); 2260 } 2261 2262 return false; 2263 } 2264 2265 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2266 2267 // We need to build the initializer AST according to order of construction 2268 // and not what user specified in the Initializers list. 2269 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2270 if (!ClassDecl) 2271 return true; 2272 2273 bool HadError = false; 2274 2275 for (unsigned i = 0; i < NumInitializers; i++) { 2276 CXXCtorInitializer *Member = Initializers[i]; 2277 2278 if (Member->isBaseInitializer()) 2279 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2280 else 2281 Info.AllBaseFields[Member->getAnyMember()] = Member; 2282 } 2283 2284 // Keep track of the direct virtual bases. 2285 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2286 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2287 E = ClassDecl->bases_end(); I != E; ++I) { 2288 if (I->isVirtual()) 2289 DirectVBases.insert(I); 2290 } 2291 2292 // Push virtual bases before others. 2293 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2294 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2295 2296 if (CXXCtorInitializer *Value 2297 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2298 Info.AllToInit.push_back(Value); 2299 } else if (!AnyErrors) { 2300 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2301 CXXCtorInitializer *CXXBaseInit; 2302 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2303 VBase, IsInheritedVirtualBase, 2304 CXXBaseInit)) { 2305 HadError = true; 2306 continue; 2307 } 2308 2309 Info.AllToInit.push_back(CXXBaseInit); 2310 } 2311 } 2312 2313 // Non-virtual bases. 2314 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2315 E = ClassDecl->bases_end(); Base != E; ++Base) { 2316 // Virtuals are in the virtual base list and already constructed. 2317 if (Base->isVirtual()) 2318 continue; 2319 2320 if (CXXCtorInitializer *Value 2321 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2322 Info.AllToInit.push_back(Value); 2323 } else if (!AnyErrors) { 2324 CXXCtorInitializer *CXXBaseInit; 2325 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2326 Base, /*IsInheritedVirtualBase=*/false, 2327 CXXBaseInit)) { 2328 HadError = true; 2329 continue; 2330 } 2331 2332 Info.AllToInit.push_back(CXXBaseInit); 2333 } 2334 } 2335 2336 // Fields. 2337 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2338 MemEnd = ClassDecl->decls_end(); 2339 Mem != MemEnd; ++Mem) { 2340 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2341 if (F->getType()->isIncompleteArrayType()) { 2342 assert(ClassDecl->hasFlexibleArrayMember() && 2343 "Incomplete array type is not valid"); 2344 continue; 2345 } 2346 2347 // If we're not generating the implicit copy constructor, then we'll 2348 // handle anonymous struct/union fields based on their individual 2349 // indirect fields. 2350 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2351 continue; 2352 2353 if (CollectFieldInitializer(*this, Info, F)) 2354 HadError = true; 2355 continue; 2356 } 2357 2358 // Beyond this point, we only consider default initialization. 2359 if (Info.IIK != IIK_Default) 2360 continue; 2361 2362 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2363 if (F->getType()->isIncompleteArrayType()) { 2364 assert(ClassDecl->hasFlexibleArrayMember() && 2365 "Incomplete array type is not valid"); 2366 continue; 2367 } 2368 2369 // If this field is somewhere within an anonymous union, we only 2370 // initialize it if there's an explicit initializer. 2371 if (isWithinAnonymousUnion(F)) { 2372 if (CXXCtorInitializer *Init 2373 = Info.AllBaseFields.lookup(F->getAnonField())) { 2374 Info.AllToInit.push_back(Init); 2375 } 2376 2377 continue; 2378 } 2379 2380 // Initialize each field of an anonymous struct individually. 2381 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2382 HadError = true; 2383 2384 continue; 2385 } 2386 } 2387 2388 NumInitializers = Info.AllToInit.size(); 2389 if (NumInitializers > 0) { 2390 Constructor->setNumCtorInitializers(NumInitializers); 2391 CXXCtorInitializer **baseOrMemberInitializers = 2392 new (Context) CXXCtorInitializer*[NumInitializers]; 2393 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2394 NumInitializers * sizeof(CXXCtorInitializer*)); 2395 Constructor->setCtorInitializers(baseOrMemberInitializers); 2396 2397 // Constructors implicitly reference the base and member 2398 // destructors. 2399 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2400 Constructor->getParent()); 2401 } 2402 2403 return HadError; 2404} 2405 2406static void *GetKeyForTopLevelField(FieldDecl *Field) { 2407 // For anonymous unions, use the class declaration as the key. 2408 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2409 if (RT->getDecl()->isAnonymousStructOrUnion()) 2410 return static_cast<void *>(RT->getDecl()); 2411 } 2412 return static_cast<void *>(Field); 2413} 2414 2415static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2416 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2417} 2418 2419static void *GetKeyForMember(ASTContext &Context, 2420 CXXCtorInitializer *Member) { 2421 if (!Member->isAnyMemberInitializer()) 2422 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2423 2424 // For fields injected into the class via declaration of an anonymous union, 2425 // use its anonymous union class declaration as the unique key. 2426 FieldDecl *Field = Member->getAnyMember(); 2427 2428 // If the field is a member of an anonymous struct or union, our key 2429 // is the anonymous record decl that's a direct child of the class. 2430 RecordDecl *RD = Field->getParent(); 2431 if (RD->isAnonymousStructOrUnion()) { 2432 while (true) { 2433 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2434 if (Parent->isAnonymousStructOrUnion()) 2435 RD = Parent; 2436 else 2437 break; 2438 } 2439 2440 return static_cast<void *>(RD); 2441 } 2442 2443 return static_cast<void *>(Field); 2444} 2445 2446static void 2447DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2448 const CXXConstructorDecl *Constructor, 2449 CXXCtorInitializer **Inits, 2450 unsigned NumInits) { 2451 if (Constructor->getDeclContext()->isDependentContext()) 2452 return; 2453 2454 // Don't check initializers order unless the warning is enabled at the 2455 // location of at least one initializer. 2456 bool ShouldCheckOrder = false; 2457 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2458 CXXCtorInitializer *Init = Inits[InitIndex]; 2459 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2460 Init->getSourceLocation()) 2461 != Diagnostic::Ignored) { 2462 ShouldCheckOrder = true; 2463 break; 2464 } 2465 } 2466 if (!ShouldCheckOrder) 2467 return; 2468 2469 // Build the list of bases and members in the order that they'll 2470 // actually be initialized. The explicit initializers should be in 2471 // this same order but may be missing things. 2472 SmallVector<const void*, 32> IdealInitKeys; 2473 2474 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2475 2476 // 1. Virtual bases. 2477 for (CXXRecordDecl::base_class_const_iterator VBase = 2478 ClassDecl->vbases_begin(), 2479 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2480 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2481 2482 // 2. Non-virtual bases. 2483 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2484 E = ClassDecl->bases_end(); Base != E; ++Base) { 2485 if (Base->isVirtual()) 2486 continue; 2487 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2488 } 2489 2490 // 3. Direct fields. 2491 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2492 E = ClassDecl->field_end(); Field != E; ++Field) 2493 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2494 2495 unsigned NumIdealInits = IdealInitKeys.size(); 2496 unsigned IdealIndex = 0; 2497 2498 CXXCtorInitializer *PrevInit = 0; 2499 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2500 CXXCtorInitializer *Init = Inits[InitIndex]; 2501 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2502 2503 // Scan forward to try to find this initializer in the idealized 2504 // initializers list. 2505 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2506 if (InitKey == IdealInitKeys[IdealIndex]) 2507 break; 2508 2509 // If we didn't find this initializer, it must be because we 2510 // scanned past it on a previous iteration. That can only 2511 // happen if we're out of order; emit a warning. 2512 if (IdealIndex == NumIdealInits && PrevInit) { 2513 Sema::SemaDiagnosticBuilder D = 2514 SemaRef.Diag(PrevInit->getSourceLocation(), 2515 diag::warn_initializer_out_of_order); 2516 2517 if (PrevInit->isAnyMemberInitializer()) 2518 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2519 else 2520 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2521 2522 if (Init->isAnyMemberInitializer()) 2523 D << 0 << Init->getAnyMember()->getDeclName(); 2524 else 2525 D << 1 << Init->getBaseClassInfo()->getType(); 2526 2527 // Move back to the initializer's location in the ideal list. 2528 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2529 if (InitKey == IdealInitKeys[IdealIndex]) 2530 break; 2531 2532 assert(IdealIndex != NumIdealInits && 2533 "initializer not found in initializer list"); 2534 } 2535 2536 PrevInit = Init; 2537 } 2538} 2539 2540namespace { 2541bool CheckRedundantInit(Sema &S, 2542 CXXCtorInitializer *Init, 2543 CXXCtorInitializer *&PrevInit) { 2544 if (!PrevInit) { 2545 PrevInit = Init; 2546 return false; 2547 } 2548 2549 if (FieldDecl *Field = Init->getMember()) 2550 S.Diag(Init->getSourceLocation(), 2551 diag::err_multiple_mem_initialization) 2552 << Field->getDeclName() 2553 << Init->getSourceRange(); 2554 else { 2555 const Type *BaseClass = Init->getBaseClass(); 2556 assert(BaseClass && "neither field nor base"); 2557 S.Diag(Init->getSourceLocation(), 2558 diag::err_multiple_base_initialization) 2559 << QualType(BaseClass, 0) 2560 << Init->getSourceRange(); 2561 } 2562 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2563 << 0 << PrevInit->getSourceRange(); 2564 2565 return true; 2566} 2567 2568typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2569typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2570 2571bool CheckRedundantUnionInit(Sema &S, 2572 CXXCtorInitializer *Init, 2573 RedundantUnionMap &Unions) { 2574 FieldDecl *Field = Init->getAnyMember(); 2575 RecordDecl *Parent = Field->getParent(); 2576 if (!Parent->isAnonymousStructOrUnion()) 2577 return false; 2578 2579 NamedDecl *Child = Field; 2580 do { 2581 if (Parent->isUnion()) { 2582 UnionEntry &En = Unions[Parent]; 2583 if (En.first && En.first != Child) { 2584 S.Diag(Init->getSourceLocation(), 2585 diag::err_multiple_mem_union_initialization) 2586 << Field->getDeclName() 2587 << Init->getSourceRange(); 2588 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2589 << 0 << En.second->getSourceRange(); 2590 return true; 2591 } else if (!En.first) { 2592 En.first = Child; 2593 En.second = Init; 2594 } 2595 } 2596 2597 Child = Parent; 2598 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2599 } while (Parent->isAnonymousStructOrUnion()); 2600 2601 return false; 2602} 2603} 2604 2605/// ActOnMemInitializers - Handle the member initializers for a constructor. 2606void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2607 SourceLocation ColonLoc, 2608 MemInitTy **meminits, unsigned NumMemInits, 2609 bool AnyErrors) { 2610 if (!ConstructorDecl) 2611 return; 2612 2613 AdjustDeclIfTemplate(ConstructorDecl); 2614 2615 CXXConstructorDecl *Constructor 2616 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2617 2618 if (!Constructor) { 2619 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2620 return; 2621 } 2622 2623 CXXCtorInitializer **MemInits = 2624 reinterpret_cast<CXXCtorInitializer **>(meminits); 2625 2626 // Mapping for the duplicate initializers check. 2627 // For member initializers, this is keyed with a FieldDecl*. 2628 // For base initializers, this is keyed with a Type*. 2629 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2630 2631 // Mapping for the inconsistent anonymous-union initializers check. 2632 RedundantUnionMap MemberUnions; 2633 2634 bool HadError = false; 2635 for (unsigned i = 0; i < NumMemInits; i++) { 2636 CXXCtorInitializer *Init = MemInits[i]; 2637 2638 // Set the source order index. 2639 Init->setSourceOrder(i); 2640 2641 if (Init->isAnyMemberInitializer()) { 2642 FieldDecl *Field = Init->getAnyMember(); 2643 if (CheckRedundantInit(*this, Init, Members[Field]) || 2644 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2645 HadError = true; 2646 } else if (Init->isBaseInitializer()) { 2647 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2648 if (CheckRedundantInit(*this, Init, Members[Key])) 2649 HadError = true; 2650 } else { 2651 assert(Init->isDelegatingInitializer()); 2652 // This must be the only initializer 2653 if (i != 0 || NumMemInits > 1) { 2654 Diag(MemInits[0]->getSourceLocation(), 2655 diag::err_delegating_initializer_alone) 2656 << MemInits[0]->getSourceRange(); 2657 HadError = true; 2658 // We will treat this as being the only initializer. 2659 } 2660 SetDelegatingInitializer(Constructor, MemInits[i]); 2661 // Return immediately as the initializer is set. 2662 return; 2663 } 2664 } 2665 2666 if (HadError) 2667 return; 2668 2669 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2670 2671 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2672} 2673 2674void 2675Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2676 CXXRecordDecl *ClassDecl) { 2677 // Ignore dependent contexts. 2678 if (ClassDecl->isDependentContext()) 2679 return; 2680 2681 // FIXME: all the access-control diagnostics are positioned on the 2682 // field/base declaration. That's probably good; that said, the 2683 // user might reasonably want to know why the destructor is being 2684 // emitted, and we currently don't say. 2685 2686 // Non-static data members. 2687 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2688 E = ClassDecl->field_end(); I != E; ++I) { 2689 FieldDecl *Field = *I; 2690 if (Field->isInvalidDecl()) 2691 continue; 2692 QualType FieldType = Context.getBaseElementType(Field->getType()); 2693 2694 const RecordType* RT = FieldType->getAs<RecordType>(); 2695 if (!RT) 2696 continue; 2697 2698 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2699 if (FieldClassDecl->isInvalidDecl()) 2700 continue; 2701 if (FieldClassDecl->hasTrivialDestructor()) 2702 continue; 2703 2704 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2705 assert(Dtor && "No dtor found for FieldClassDecl!"); 2706 CheckDestructorAccess(Field->getLocation(), Dtor, 2707 PDiag(diag::err_access_dtor_field) 2708 << Field->getDeclName() 2709 << FieldType); 2710 2711 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2712 } 2713 2714 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2715 2716 // Bases. 2717 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2718 E = ClassDecl->bases_end(); Base != E; ++Base) { 2719 // Bases are always records in a well-formed non-dependent class. 2720 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2721 2722 // Remember direct virtual bases. 2723 if (Base->isVirtual()) 2724 DirectVirtualBases.insert(RT); 2725 2726 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2727 // If our base class is invalid, we probably can't get its dtor anyway. 2728 if (BaseClassDecl->isInvalidDecl()) 2729 continue; 2730 // Ignore trivial destructors. 2731 if (BaseClassDecl->hasTrivialDestructor()) 2732 continue; 2733 2734 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2735 assert(Dtor && "No dtor found for BaseClassDecl!"); 2736 2737 // FIXME: caret should be on the start of the class name 2738 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2739 PDiag(diag::err_access_dtor_base) 2740 << Base->getType() 2741 << Base->getSourceRange()); 2742 2743 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2744 } 2745 2746 // Virtual bases. 2747 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2748 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2749 2750 // Bases are always records in a well-formed non-dependent class. 2751 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2752 2753 // Ignore direct virtual bases. 2754 if (DirectVirtualBases.count(RT)) 2755 continue; 2756 2757 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2758 // If our base class is invalid, we probably can't get its dtor anyway. 2759 if (BaseClassDecl->isInvalidDecl()) 2760 continue; 2761 // Ignore trivial destructors. 2762 if (BaseClassDecl->hasTrivialDestructor()) 2763 continue; 2764 2765 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2766 assert(Dtor && "No dtor found for BaseClassDecl!"); 2767 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2768 PDiag(diag::err_access_dtor_vbase) 2769 << VBase->getType()); 2770 2771 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2772 } 2773} 2774 2775void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2776 if (!CDtorDecl) 2777 return; 2778 2779 if (CXXConstructorDecl *Constructor 2780 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2781 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2782} 2783 2784bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2785 unsigned DiagID, AbstractDiagSelID SelID) { 2786 if (SelID == -1) 2787 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2788 else 2789 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2790} 2791 2792bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2793 const PartialDiagnostic &PD) { 2794 if (!getLangOptions().CPlusPlus) 2795 return false; 2796 2797 if (const ArrayType *AT = Context.getAsArrayType(T)) 2798 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2799 2800 if (const PointerType *PT = T->getAs<PointerType>()) { 2801 // Find the innermost pointer type. 2802 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2803 PT = T; 2804 2805 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2806 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2807 } 2808 2809 const RecordType *RT = T->getAs<RecordType>(); 2810 if (!RT) 2811 return false; 2812 2813 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2814 2815 // We can't answer whether something is abstract until it has a 2816 // definition. If it's currently being defined, we'll walk back 2817 // over all the declarations when we have a full definition. 2818 const CXXRecordDecl *Def = RD->getDefinition(); 2819 if (!Def || Def->isBeingDefined()) 2820 return false; 2821 2822 if (!RD->isAbstract()) 2823 return false; 2824 2825 Diag(Loc, PD) << RD->getDeclName(); 2826 DiagnoseAbstractType(RD); 2827 2828 return true; 2829} 2830 2831void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2832 // Check if we've already emitted the list of pure virtual functions 2833 // for this class. 2834 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2835 return; 2836 2837 CXXFinalOverriderMap FinalOverriders; 2838 RD->getFinalOverriders(FinalOverriders); 2839 2840 // Keep a set of seen pure methods so we won't diagnose the same method 2841 // more than once. 2842 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2843 2844 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2845 MEnd = FinalOverriders.end(); 2846 M != MEnd; 2847 ++M) { 2848 for (OverridingMethods::iterator SO = M->second.begin(), 2849 SOEnd = M->second.end(); 2850 SO != SOEnd; ++SO) { 2851 // C++ [class.abstract]p4: 2852 // A class is abstract if it contains or inherits at least one 2853 // pure virtual function for which the final overrider is pure 2854 // virtual. 2855 2856 // 2857 if (SO->second.size() != 1) 2858 continue; 2859 2860 if (!SO->second.front().Method->isPure()) 2861 continue; 2862 2863 if (!SeenPureMethods.insert(SO->second.front().Method)) 2864 continue; 2865 2866 Diag(SO->second.front().Method->getLocation(), 2867 diag::note_pure_virtual_function) 2868 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2869 } 2870 } 2871 2872 if (!PureVirtualClassDiagSet) 2873 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2874 PureVirtualClassDiagSet->insert(RD); 2875} 2876 2877namespace { 2878struct AbstractUsageInfo { 2879 Sema &S; 2880 CXXRecordDecl *Record; 2881 CanQualType AbstractType; 2882 bool Invalid; 2883 2884 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2885 : S(S), Record(Record), 2886 AbstractType(S.Context.getCanonicalType( 2887 S.Context.getTypeDeclType(Record))), 2888 Invalid(false) {} 2889 2890 void DiagnoseAbstractType() { 2891 if (Invalid) return; 2892 S.DiagnoseAbstractType(Record); 2893 Invalid = true; 2894 } 2895 2896 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2897}; 2898 2899struct CheckAbstractUsage { 2900 AbstractUsageInfo &Info; 2901 const NamedDecl *Ctx; 2902 2903 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2904 : Info(Info), Ctx(Ctx) {} 2905 2906 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2907 switch (TL.getTypeLocClass()) { 2908#define ABSTRACT_TYPELOC(CLASS, PARENT) 2909#define TYPELOC(CLASS, PARENT) \ 2910 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2911#include "clang/AST/TypeLocNodes.def" 2912 } 2913 } 2914 2915 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2916 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2917 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2918 if (!TL.getArg(I)) 2919 continue; 2920 2921 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2922 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2923 } 2924 } 2925 2926 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2927 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2928 } 2929 2930 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2931 // Visit the type parameters from a permissive context. 2932 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2933 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2934 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2935 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2936 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2937 // TODO: other template argument types? 2938 } 2939 } 2940 2941 // Visit pointee types from a permissive context. 2942#define CheckPolymorphic(Type) \ 2943 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2944 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2945 } 2946 CheckPolymorphic(PointerTypeLoc) 2947 CheckPolymorphic(ReferenceTypeLoc) 2948 CheckPolymorphic(MemberPointerTypeLoc) 2949 CheckPolymorphic(BlockPointerTypeLoc) 2950 2951 /// Handle all the types we haven't given a more specific 2952 /// implementation for above. 2953 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2954 // Every other kind of type that we haven't called out already 2955 // that has an inner type is either (1) sugar or (2) contains that 2956 // inner type in some way as a subobject. 2957 if (TypeLoc Next = TL.getNextTypeLoc()) 2958 return Visit(Next, Sel); 2959 2960 // If there's no inner type and we're in a permissive context, 2961 // don't diagnose. 2962 if (Sel == Sema::AbstractNone) return; 2963 2964 // Check whether the type matches the abstract type. 2965 QualType T = TL.getType(); 2966 if (T->isArrayType()) { 2967 Sel = Sema::AbstractArrayType; 2968 T = Info.S.Context.getBaseElementType(T); 2969 } 2970 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2971 if (CT != Info.AbstractType) return; 2972 2973 // It matched; do some magic. 2974 if (Sel == Sema::AbstractArrayType) { 2975 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2976 << T << TL.getSourceRange(); 2977 } else { 2978 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2979 << Sel << T << TL.getSourceRange(); 2980 } 2981 Info.DiagnoseAbstractType(); 2982 } 2983}; 2984 2985void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2986 Sema::AbstractDiagSelID Sel) { 2987 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2988} 2989 2990} 2991 2992/// Check for invalid uses of an abstract type in a method declaration. 2993static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2994 CXXMethodDecl *MD) { 2995 // No need to do the check on definitions, which require that 2996 // the return/param types be complete. 2997 if (MD->doesThisDeclarationHaveABody()) 2998 return; 2999 3000 // For safety's sake, just ignore it if we don't have type source 3001 // information. This should never happen for non-implicit methods, 3002 // but... 3003 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3004 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3005} 3006 3007/// Check for invalid uses of an abstract type within a class definition. 3008static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3009 CXXRecordDecl *RD) { 3010 for (CXXRecordDecl::decl_iterator 3011 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3012 Decl *D = *I; 3013 if (D->isImplicit()) continue; 3014 3015 // Methods and method templates. 3016 if (isa<CXXMethodDecl>(D)) { 3017 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3018 } else if (isa<FunctionTemplateDecl>(D)) { 3019 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3020 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3021 3022 // Fields and static variables. 3023 } else if (isa<FieldDecl>(D)) { 3024 FieldDecl *FD = cast<FieldDecl>(D); 3025 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3026 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3027 } else if (isa<VarDecl>(D)) { 3028 VarDecl *VD = cast<VarDecl>(D); 3029 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3030 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3031 3032 // Nested classes and class templates. 3033 } else if (isa<CXXRecordDecl>(D)) { 3034 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3035 } else if (isa<ClassTemplateDecl>(D)) { 3036 CheckAbstractClassUsage(Info, 3037 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3038 } 3039 } 3040} 3041 3042/// \brief Perform semantic checks on a class definition that has been 3043/// completing, introducing implicitly-declared members, checking for 3044/// abstract types, etc. 3045void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3046 if (!Record) 3047 return; 3048 3049 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3050 AbstractUsageInfo Info(*this, Record); 3051 CheckAbstractClassUsage(Info, Record); 3052 } 3053 3054 // If this is not an aggregate type and has no user-declared constructor, 3055 // complain about any non-static data members of reference or const scalar 3056 // type, since they will never get initializers. 3057 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3058 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3059 bool Complained = false; 3060 for (RecordDecl::field_iterator F = Record->field_begin(), 3061 FEnd = Record->field_end(); 3062 F != FEnd; ++F) { 3063 if (F->hasInClassInitializer()) 3064 continue; 3065 3066 if (F->getType()->isReferenceType() || 3067 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3068 if (!Complained) { 3069 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3070 << Record->getTagKind() << Record; 3071 Complained = true; 3072 } 3073 3074 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3075 << F->getType()->isReferenceType() 3076 << F->getDeclName(); 3077 } 3078 } 3079 } 3080 3081 if (Record->isDynamicClass() && !Record->isDependentType()) 3082 DynamicClasses.push_back(Record); 3083 3084 if (Record->getIdentifier()) { 3085 // C++ [class.mem]p13: 3086 // If T is the name of a class, then each of the following shall have a 3087 // name different from T: 3088 // - every member of every anonymous union that is a member of class T. 3089 // 3090 // C++ [class.mem]p14: 3091 // In addition, if class T has a user-declared constructor (12.1), every 3092 // non-static data member of class T shall have a name different from T. 3093 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3094 R.first != R.second; ++R.first) { 3095 NamedDecl *D = *R.first; 3096 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3097 isa<IndirectFieldDecl>(D)) { 3098 Diag(D->getLocation(), diag::err_member_name_of_class) 3099 << D->getDeclName(); 3100 break; 3101 } 3102 } 3103 } 3104 3105 // Warn if the class has virtual methods but non-virtual public destructor. 3106 if (Record->isPolymorphic() && !Record->isDependentType()) { 3107 CXXDestructorDecl *dtor = Record->getDestructor(); 3108 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3109 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3110 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3111 } 3112 3113 // See if a method overloads virtual methods in a base 3114 /// class without overriding any. 3115 if (!Record->isDependentType()) { 3116 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3117 MEnd = Record->method_end(); 3118 M != MEnd; ++M) { 3119 if (!(*M)->isStatic()) 3120 DiagnoseHiddenVirtualMethods(Record, *M); 3121 } 3122 } 3123 3124 // Declare inherited constructors. We do this eagerly here because: 3125 // - The standard requires an eager diagnostic for conflicting inherited 3126 // constructors from different classes. 3127 // - The lazy declaration of the other implicit constructors is so as to not 3128 // waste space and performance on classes that are not meant to be 3129 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3130 // have inherited constructors. 3131 DeclareInheritedConstructors(Record); 3132 3133 if (!Record->isDependentType()) 3134 CheckExplicitlyDefaultedMethods(Record); 3135} 3136 3137void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3138 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3139 ME = Record->method_end(); 3140 MI != ME; ++MI) { 3141 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3142 switch (getSpecialMember(*MI)) { 3143 case CXXDefaultConstructor: 3144 CheckExplicitlyDefaultedDefaultConstructor( 3145 cast<CXXConstructorDecl>(*MI)); 3146 break; 3147 3148 case CXXDestructor: 3149 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3150 break; 3151 3152 case CXXCopyConstructor: 3153 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3154 break; 3155 3156 case CXXCopyAssignment: 3157 CheckExplicitlyDefaultedCopyAssignment(*MI); 3158 break; 3159 3160 case CXXMoveConstructor: 3161 case CXXMoveAssignment: 3162 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3163 break; 3164 3165 default: 3166 // FIXME: Do moves once they exist 3167 llvm_unreachable("non-special member explicitly defaulted!"); 3168 } 3169 } 3170 } 3171 3172} 3173 3174void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3175 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3176 3177 // Whether this was the first-declared instance of the constructor. 3178 // This affects whether we implicitly add an exception spec (and, eventually, 3179 // constexpr). It is also ill-formed to explicitly default a constructor such 3180 // that it would be deleted. (C++0x [decl.fct.def.default]) 3181 bool First = CD == CD->getCanonicalDecl(); 3182 3183 bool HadError = false; 3184 if (CD->getNumParams() != 0) { 3185 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3186 << CD->getSourceRange(); 3187 HadError = true; 3188 } 3189 3190 ImplicitExceptionSpecification Spec 3191 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3192 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3193 if (EPI.ExceptionSpecType == EST_Delayed) { 3194 // Exception specification depends on some deferred part of the class. We'll 3195 // try again when the class's definition has been fully processed. 3196 return; 3197 } 3198 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3199 *ExceptionType = Context.getFunctionType( 3200 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3201 3202 if (CtorType->hasExceptionSpec()) { 3203 if (CheckEquivalentExceptionSpec( 3204 PDiag(diag::err_incorrect_defaulted_exception_spec) 3205 << CXXDefaultConstructor, 3206 PDiag(), 3207 ExceptionType, SourceLocation(), 3208 CtorType, CD->getLocation())) { 3209 HadError = true; 3210 } 3211 } else if (First) { 3212 // We set the declaration to have the computed exception spec here. 3213 // We know there are no parameters. 3214 EPI.ExtInfo = CtorType->getExtInfo(); 3215 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3216 } 3217 3218 if (HadError) { 3219 CD->setInvalidDecl(); 3220 return; 3221 } 3222 3223 if (ShouldDeleteDefaultConstructor(CD)) { 3224 if (First) { 3225 CD->setDeletedAsWritten(); 3226 } else { 3227 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3228 << CXXDefaultConstructor; 3229 CD->setInvalidDecl(); 3230 } 3231 } 3232} 3233 3234void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3235 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3236 3237 // Whether this was the first-declared instance of the constructor. 3238 bool First = CD == CD->getCanonicalDecl(); 3239 3240 bool HadError = false; 3241 if (CD->getNumParams() != 1) { 3242 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3243 << CD->getSourceRange(); 3244 HadError = true; 3245 } 3246 3247 ImplicitExceptionSpecification Spec(Context); 3248 bool Const; 3249 llvm::tie(Spec, Const) = 3250 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3251 3252 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3253 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3254 *ExceptionType = Context.getFunctionType( 3255 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3256 3257 // Check for parameter type matching. 3258 // This is a copy ctor so we know it's a cv-qualified reference to T. 3259 QualType ArgType = CtorType->getArgType(0); 3260 if (ArgType->getPointeeType().isVolatileQualified()) { 3261 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3262 HadError = true; 3263 } 3264 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3265 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3266 HadError = true; 3267 } 3268 3269 if (CtorType->hasExceptionSpec()) { 3270 if (CheckEquivalentExceptionSpec( 3271 PDiag(diag::err_incorrect_defaulted_exception_spec) 3272 << CXXCopyConstructor, 3273 PDiag(), 3274 ExceptionType, SourceLocation(), 3275 CtorType, CD->getLocation())) { 3276 HadError = true; 3277 } 3278 } else if (First) { 3279 // We set the declaration to have the computed exception spec here. 3280 // We duplicate the one parameter type. 3281 EPI.ExtInfo = CtorType->getExtInfo(); 3282 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3283 } 3284 3285 if (HadError) { 3286 CD->setInvalidDecl(); 3287 return; 3288 } 3289 3290 if (ShouldDeleteCopyConstructor(CD)) { 3291 if (First) { 3292 CD->setDeletedAsWritten(); 3293 } else { 3294 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3295 << CXXCopyConstructor; 3296 CD->setInvalidDecl(); 3297 } 3298 } 3299} 3300 3301void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3302 assert(MD->isExplicitlyDefaulted()); 3303 3304 // Whether this was the first-declared instance of the operator 3305 bool First = MD == MD->getCanonicalDecl(); 3306 3307 bool HadError = false; 3308 if (MD->getNumParams() != 1) { 3309 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3310 << MD->getSourceRange(); 3311 HadError = true; 3312 } 3313 3314 QualType ReturnType = 3315 MD->getType()->getAs<FunctionType>()->getResultType(); 3316 if (!ReturnType->isLValueReferenceType() || 3317 !Context.hasSameType( 3318 Context.getCanonicalType(ReturnType->getPointeeType()), 3319 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3320 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3321 HadError = true; 3322 } 3323 3324 ImplicitExceptionSpecification Spec(Context); 3325 bool Const; 3326 llvm::tie(Spec, Const) = 3327 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3328 3329 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3330 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3331 *ExceptionType = Context.getFunctionType( 3332 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3333 3334 QualType ArgType = OperType->getArgType(0); 3335 if (!ArgType->isReferenceType()) { 3336 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3337 HadError = true; 3338 } else { 3339 if (ArgType->getPointeeType().isVolatileQualified()) { 3340 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3341 HadError = true; 3342 } 3343 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3344 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3345 HadError = true; 3346 } 3347 } 3348 3349 if (OperType->getTypeQuals()) { 3350 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3351 HadError = true; 3352 } 3353 3354 if (OperType->hasExceptionSpec()) { 3355 if (CheckEquivalentExceptionSpec( 3356 PDiag(diag::err_incorrect_defaulted_exception_spec) 3357 << CXXCopyAssignment, 3358 PDiag(), 3359 ExceptionType, SourceLocation(), 3360 OperType, MD->getLocation())) { 3361 HadError = true; 3362 } 3363 } else if (First) { 3364 // We set the declaration to have the computed exception spec here. 3365 // We duplicate the one parameter type. 3366 EPI.RefQualifier = OperType->getRefQualifier(); 3367 EPI.ExtInfo = OperType->getExtInfo(); 3368 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3369 } 3370 3371 if (HadError) { 3372 MD->setInvalidDecl(); 3373 return; 3374 } 3375 3376 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3377 if (First) { 3378 MD->setDeletedAsWritten(); 3379 } else { 3380 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3381 << CXXCopyAssignment; 3382 MD->setInvalidDecl(); 3383 } 3384 } 3385} 3386 3387void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3388 assert(DD->isExplicitlyDefaulted()); 3389 3390 // Whether this was the first-declared instance of the destructor. 3391 bool First = DD == DD->getCanonicalDecl(); 3392 3393 ImplicitExceptionSpecification Spec 3394 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3395 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3396 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3397 *ExceptionType = Context.getFunctionType( 3398 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3399 3400 if (DtorType->hasExceptionSpec()) { 3401 if (CheckEquivalentExceptionSpec( 3402 PDiag(diag::err_incorrect_defaulted_exception_spec) 3403 << CXXDestructor, 3404 PDiag(), 3405 ExceptionType, SourceLocation(), 3406 DtorType, DD->getLocation())) { 3407 DD->setInvalidDecl(); 3408 return; 3409 } 3410 } else if (First) { 3411 // We set the declaration to have the computed exception spec here. 3412 // There are no parameters. 3413 EPI.ExtInfo = DtorType->getExtInfo(); 3414 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3415 } 3416 3417 if (ShouldDeleteDestructor(DD)) { 3418 if (First) { 3419 DD->setDeletedAsWritten(); 3420 } else { 3421 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3422 << CXXDestructor; 3423 DD->setInvalidDecl(); 3424 } 3425 } 3426} 3427 3428bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3429 CXXRecordDecl *RD = CD->getParent(); 3430 assert(!RD->isDependentType() && "do deletion after instantiation"); 3431 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3432 return false; 3433 3434 SourceLocation Loc = CD->getLocation(); 3435 3436 // Do access control from the constructor 3437 ContextRAII CtorContext(*this, CD); 3438 3439 bool Union = RD->isUnion(); 3440 bool AllConst = true; 3441 3442 // We do this because we should never actually use an anonymous 3443 // union's constructor. 3444 if (Union && RD->isAnonymousStructOrUnion()) 3445 return false; 3446 3447 // FIXME: We should put some diagnostic logic right into this function. 3448 3449 // C++0x [class.ctor]/5 3450 // A defaulted default constructor for class X is defined as deleted if: 3451 3452 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3453 BE = RD->bases_end(); 3454 BI != BE; ++BI) { 3455 // We'll handle this one later 3456 if (BI->isVirtual()) 3457 continue; 3458 3459 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3460 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3461 3462 // -- any [direct base class] has a type with a destructor that is 3463 // deleted or inaccessible from the defaulted default constructor 3464 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3465 if (BaseDtor->isDeleted()) 3466 return true; 3467 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3468 AR_accessible) 3469 return true; 3470 3471 // -- any [direct base class either] has no default constructor or 3472 // overload resolution as applied to [its] default constructor 3473 // results in an ambiguity or in a function that is deleted or 3474 // inaccessible from the defaulted default constructor 3475 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3476 if (!BaseDefault || BaseDefault->isDeleted()) 3477 return true; 3478 3479 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3480 PDiag()) != AR_accessible) 3481 return true; 3482 } 3483 3484 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3485 BE = RD->vbases_end(); 3486 BI != BE; ++BI) { 3487 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3488 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3489 3490 // -- any [virtual base class] has a type with a destructor that is 3491 // delete or inaccessible from the defaulted default constructor 3492 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3493 if (BaseDtor->isDeleted()) 3494 return true; 3495 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3496 AR_accessible) 3497 return true; 3498 3499 // -- any [virtual base class either] has no default constructor or 3500 // overload resolution as applied to [its] default constructor 3501 // results in an ambiguity or in a function that is deleted or 3502 // inaccessible from the defaulted default constructor 3503 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3504 if (!BaseDefault || BaseDefault->isDeleted()) 3505 return true; 3506 3507 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3508 PDiag()) != AR_accessible) 3509 return true; 3510 } 3511 3512 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3513 FE = RD->field_end(); 3514 FI != FE; ++FI) { 3515 if (FI->isInvalidDecl()) 3516 continue; 3517 3518 QualType FieldType = Context.getBaseElementType(FI->getType()); 3519 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3520 3521 // -- any non-static data member with no brace-or-equal-initializer is of 3522 // reference type 3523 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3524 return true; 3525 3526 // -- X is a union and all its variant members are of const-qualified type 3527 // (or array thereof) 3528 if (Union && !FieldType.isConstQualified()) 3529 AllConst = false; 3530 3531 if (FieldRecord) { 3532 // -- X is a union-like class that has a variant member with a non-trivial 3533 // default constructor 3534 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3535 return true; 3536 3537 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3538 if (FieldDtor->isDeleted()) 3539 return true; 3540 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3541 AR_accessible) 3542 return true; 3543 3544 // -- any non-variant non-static data member of const-qualified type (or 3545 // array thereof) with no brace-or-equal-initializer does not have a 3546 // user-provided default constructor 3547 if (FieldType.isConstQualified() && 3548 !FI->hasInClassInitializer() && 3549 !FieldRecord->hasUserProvidedDefaultConstructor()) 3550 return true; 3551 3552 if (!Union && FieldRecord->isUnion() && 3553 FieldRecord->isAnonymousStructOrUnion()) { 3554 // We're okay to reuse AllConst here since we only care about the 3555 // value otherwise if we're in a union. 3556 AllConst = true; 3557 3558 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3559 UE = FieldRecord->field_end(); 3560 UI != UE; ++UI) { 3561 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3562 CXXRecordDecl *UnionFieldRecord = 3563 UnionFieldType->getAsCXXRecordDecl(); 3564 3565 if (!UnionFieldType.isConstQualified()) 3566 AllConst = false; 3567 3568 if (UnionFieldRecord && 3569 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3570 return true; 3571 } 3572 3573 if (AllConst) 3574 return true; 3575 3576 // Don't try to initialize the anonymous union 3577 // This is technically non-conformant, but sanity demands it. 3578 continue; 3579 } 3580 3581 // -- any non-static data member with no brace-or-equal-initializer has 3582 // class type M (or array thereof) and either M has no default 3583 // constructor or overload resolution as applied to M's default 3584 // constructor results in an ambiguity or in a function that is deleted 3585 // or inaccessible from the defaulted default constructor. 3586 if (!FI->hasInClassInitializer()) { 3587 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3588 if (!FieldDefault || FieldDefault->isDeleted()) 3589 return true; 3590 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3591 PDiag()) != AR_accessible) 3592 return true; 3593 } 3594 } else if (!Union && FieldType.isConstQualified() && 3595 !FI->hasInClassInitializer()) { 3596 // -- any non-variant non-static data member of const-qualified type (or 3597 // array thereof) with no brace-or-equal-initializer does not have a 3598 // user-provided default constructor 3599 return true; 3600 } 3601 } 3602 3603 if (Union && AllConst) 3604 return true; 3605 3606 return false; 3607} 3608 3609bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3610 CXXRecordDecl *RD = CD->getParent(); 3611 assert(!RD->isDependentType() && "do deletion after instantiation"); 3612 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3613 return false; 3614 3615 SourceLocation Loc = CD->getLocation(); 3616 3617 // Do access control from the constructor 3618 ContextRAII CtorContext(*this, CD); 3619 3620 bool Union = RD->isUnion(); 3621 3622 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3623 "copy assignment arg has no pointee type"); 3624 unsigned ArgQuals = 3625 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3626 Qualifiers::Const : 0; 3627 3628 // We do this because we should never actually use an anonymous 3629 // union's constructor. 3630 if (Union && RD->isAnonymousStructOrUnion()) 3631 return false; 3632 3633 // FIXME: We should put some diagnostic logic right into this function. 3634 3635 // C++0x [class.copy]/11 3636 // A defaulted [copy] constructor for class X is defined as delete if X has: 3637 3638 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3639 BE = RD->bases_end(); 3640 BI != BE; ++BI) { 3641 // We'll handle this one later 3642 if (BI->isVirtual()) 3643 continue; 3644 3645 QualType BaseType = BI->getType(); 3646 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3647 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3648 3649 // -- any [direct base class] of a type with a destructor that is deleted or 3650 // inaccessible from the defaulted constructor 3651 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3652 if (BaseDtor->isDeleted()) 3653 return true; 3654 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3655 AR_accessible) 3656 return true; 3657 3658 // -- a [direct base class] B that cannot be [copied] because overload 3659 // resolution, as applied to B's [copy] constructor, results in an 3660 // ambiguity or a function that is deleted or inaccessible from the 3661 // defaulted constructor 3662 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3663 if (!BaseCtor || BaseCtor->isDeleted()) 3664 return true; 3665 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3666 AR_accessible) 3667 return true; 3668 } 3669 3670 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3671 BE = RD->vbases_end(); 3672 BI != BE; ++BI) { 3673 QualType BaseType = BI->getType(); 3674 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3675 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3676 3677 // -- any [virtual base class] of a type with a destructor that is deleted or 3678 // inaccessible from the defaulted constructor 3679 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3680 if (BaseDtor->isDeleted()) 3681 return true; 3682 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3683 AR_accessible) 3684 return true; 3685 3686 // -- a [virtual base class] B that cannot be [copied] because overload 3687 // resolution, as applied to B's [copy] constructor, results in an 3688 // ambiguity or a function that is deleted or inaccessible from the 3689 // defaulted constructor 3690 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3691 if (!BaseCtor || BaseCtor->isDeleted()) 3692 return true; 3693 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3694 AR_accessible) 3695 return true; 3696 } 3697 3698 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3699 FE = RD->field_end(); 3700 FI != FE; ++FI) { 3701 QualType FieldType = Context.getBaseElementType(FI->getType()); 3702 3703 // -- for a copy constructor, a non-static data member of rvalue reference 3704 // type 3705 if (FieldType->isRValueReferenceType()) 3706 return true; 3707 3708 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3709 3710 if (FieldRecord) { 3711 // This is an anonymous union 3712 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3713 // Anonymous unions inside unions do not variant members create 3714 if (!Union) { 3715 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3716 UE = FieldRecord->field_end(); 3717 UI != UE; ++UI) { 3718 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3719 CXXRecordDecl *UnionFieldRecord = 3720 UnionFieldType->getAsCXXRecordDecl(); 3721 3722 // -- a variant member with a non-trivial [copy] constructor and X 3723 // is a union-like class 3724 if (UnionFieldRecord && 3725 !UnionFieldRecord->hasTrivialCopyConstructor()) 3726 return true; 3727 } 3728 } 3729 3730 // Don't try to initalize an anonymous union 3731 continue; 3732 } else { 3733 // -- a variant member with a non-trivial [copy] constructor and X is a 3734 // union-like class 3735 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3736 return true; 3737 3738 // -- any [non-static data member] of a type with a destructor that is 3739 // deleted or inaccessible from the defaulted constructor 3740 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3741 if (FieldDtor->isDeleted()) 3742 return true; 3743 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3744 AR_accessible) 3745 return true; 3746 } 3747 3748 // -- a [non-static data member of class type (or array thereof)] B that 3749 // cannot be [copied] because overload resolution, as applied to B's 3750 // [copy] constructor, results in an ambiguity or a function that is 3751 // deleted or inaccessible from the defaulted constructor 3752 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3753 ArgQuals); 3754 if (!FieldCtor || FieldCtor->isDeleted()) 3755 return true; 3756 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3757 PDiag()) != AR_accessible) 3758 return true; 3759 } 3760 } 3761 3762 return false; 3763} 3764 3765bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3766 CXXRecordDecl *RD = MD->getParent(); 3767 assert(!RD->isDependentType() && "do deletion after instantiation"); 3768 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3769 return false; 3770 3771 SourceLocation Loc = MD->getLocation(); 3772 3773 // Do access control from the constructor 3774 ContextRAII MethodContext(*this, MD); 3775 3776 bool Union = RD->isUnion(); 3777 3778 unsigned ArgQuals = 3779 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3780 Qualifiers::Const : 0; 3781 3782 // We do this because we should never actually use an anonymous 3783 // union's constructor. 3784 if (Union && RD->isAnonymousStructOrUnion()) 3785 return false; 3786 3787 // FIXME: We should put some diagnostic logic right into this function. 3788 3789 // C++0x [class.copy]/11 3790 // A defaulted [copy] assignment operator for class X is defined as deleted 3791 // if X has: 3792 3793 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3794 BE = RD->bases_end(); 3795 BI != BE; ++BI) { 3796 // We'll handle this one later 3797 if (BI->isVirtual()) 3798 continue; 3799 3800 QualType BaseType = BI->getType(); 3801 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3802 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3803 3804 // -- a [direct base class] B that cannot be [copied] because overload 3805 // resolution, as applied to B's [copy] assignment operator, results in 3806 // an ambiguity or a function that is deleted or inaccessible from the 3807 // assignment operator 3808 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3809 0); 3810 if (!CopyOper || CopyOper->isDeleted()) 3811 return true; 3812 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3813 return true; 3814 } 3815 3816 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3817 BE = RD->vbases_end(); 3818 BI != BE; ++BI) { 3819 QualType BaseType = BI->getType(); 3820 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3821 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3822 3823 // -- a [virtual base class] B that cannot be [copied] because overload 3824 // resolution, as applied to B's [copy] assignment operator, results in 3825 // an ambiguity or a function that is deleted or inaccessible from the 3826 // assignment operator 3827 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3828 0); 3829 if (!CopyOper || CopyOper->isDeleted()) 3830 return true; 3831 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3832 return true; 3833 } 3834 3835 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3836 FE = RD->field_end(); 3837 FI != FE; ++FI) { 3838 QualType FieldType = Context.getBaseElementType(FI->getType()); 3839 3840 // -- a non-static data member of reference type 3841 if (FieldType->isReferenceType()) 3842 return true; 3843 3844 // -- a non-static data member of const non-class type (or array thereof) 3845 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3846 return true; 3847 3848 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3849 3850 if (FieldRecord) { 3851 // This is an anonymous union 3852 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3853 // Anonymous unions inside unions do not variant members create 3854 if (!Union) { 3855 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3856 UE = FieldRecord->field_end(); 3857 UI != UE; ++UI) { 3858 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3859 CXXRecordDecl *UnionFieldRecord = 3860 UnionFieldType->getAsCXXRecordDecl(); 3861 3862 // -- a variant member with a non-trivial [copy] assignment operator 3863 // and X is a union-like class 3864 if (UnionFieldRecord && 3865 !UnionFieldRecord->hasTrivialCopyAssignment()) 3866 return true; 3867 } 3868 } 3869 3870 // Don't try to initalize an anonymous union 3871 continue; 3872 // -- a variant member with a non-trivial [copy] assignment operator 3873 // and X is a union-like class 3874 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3875 return true; 3876 } 3877 3878 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 3879 false, 0); 3880 if (!CopyOper || CopyOper->isDeleted()) 3881 return false; 3882 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3883 return false; 3884 } 3885 } 3886 3887 return false; 3888} 3889 3890bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3891 CXXRecordDecl *RD = DD->getParent(); 3892 assert(!RD->isDependentType() && "do deletion after instantiation"); 3893 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3894 return false; 3895 3896 SourceLocation Loc = DD->getLocation(); 3897 3898 // Do access control from the destructor 3899 ContextRAII CtorContext(*this, DD); 3900 3901 bool Union = RD->isUnion(); 3902 3903 // We do this because we should never actually use an anonymous 3904 // union's destructor. 3905 if (Union && RD->isAnonymousStructOrUnion()) 3906 return false; 3907 3908 // C++0x [class.dtor]p5 3909 // A defaulted destructor for a class X is defined as deleted if: 3910 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3911 BE = RD->bases_end(); 3912 BI != BE; ++BI) { 3913 // We'll handle this one later 3914 if (BI->isVirtual()) 3915 continue; 3916 3917 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3918 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3919 assert(BaseDtor && "base has no destructor"); 3920 3921 // -- any direct or virtual base class has a deleted destructor or 3922 // a destructor that is inaccessible from the defaulted destructor 3923 if (BaseDtor->isDeleted()) 3924 return true; 3925 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3926 AR_accessible) 3927 return true; 3928 } 3929 3930 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3931 BE = RD->vbases_end(); 3932 BI != BE; ++BI) { 3933 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3934 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3935 assert(BaseDtor && "base has no destructor"); 3936 3937 // -- any direct or virtual base class has a deleted destructor or 3938 // a destructor that is inaccessible from the defaulted destructor 3939 if (BaseDtor->isDeleted()) 3940 return true; 3941 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3942 AR_accessible) 3943 return true; 3944 } 3945 3946 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3947 FE = RD->field_end(); 3948 FI != FE; ++FI) { 3949 QualType FieldType = Context.getBaseElementType(FI->getType()); 3950 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3951 if (FieldRecord) { 3952 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3953 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3954 UE = FieldRecord->field_end(); 3955 UI != UE; ++UI) { 3956 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3957 CXXRecordDecl *UnionFieldRecord = 3958 UnionFieldType->getAsCXXRecordDecl(); 3959 3960 // -- X is a union-like class that has a variant member with a non- 3961 // trivial destructor. 3962 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3963 return true; 3964 } 3965 // Technically we are supposed to do this next check unconditionally. 3966 // But that makes absolutely no sense. 3967 } else { 3968 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3969 3970 // -- any of the non-static data members has class type M (or array 3971 // thereof) and M has a deleted destructor or a destructor that is 3972 // inaccessible from the defaulted destructor 3973 if (FieldDtor->isDeleted()) 3974 return true; 3975 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3976 AR_accessible) 3977 return true; 3978 3979 // -- X is a union-like class that has a variant member with a non- 3980 // trivial destructor. 3981 if (Union && !FieldDtor->isTrivial()) 3982 return true; 3983 } 3984 } 3985 } 3986 3987 if (DD->isVirtual()) { 3988 FunctionDecl *OperatorDelete = 0; 3989 DeclarationName Name = 3990 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3991 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3992 false)) 3993 return true; 3994 } 3995 3996 3997 return false; 3998} 3999 4000/// \brief Data used with FindHiddenVirtualMethod 4001namespace { 4002 struct FindHiddenVirtualMethodData { 4003 Sema *S; 4004 CXXMethodDecl *Method; 4005 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4006 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4007 }; 4008} 4009 4010/// \brief Member lookup function that determines whether a given C++ 4011/// method overloads virtual methods in a base class without overriding any, 4012/// to be used with CXXRecordDecl::lookupInBases(). 4013static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4014 CXXBasePath &Path, 4015 void *UserData) { 4016 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4017 4018 FindHiddenVirtualMethodData &Data 4019 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4020 4021 DeclarationName Name = Data.Method->getDeclName(); 4022 assert(Name.getNameKind() == DeclarationName::Identifier); 4023 4024 bool foundSameNameMethod = false; 4025 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4026 for (Path.Decls = BaseRecord->lookup(Name); 4027 Path.Decls.first != Path.Decls.second; 4028 ++Path.Decls.first) { 4029 NamedDecl *D = *Path.Decls.first; 4030 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4031 MD = MD->getCanonicalDecl(); 4032 foundSameNameMethod = true; 4033 // Interested only in hidden virtual methods. 4034 if (!MD->isVirtual()) 4035 continue; 4036 // If the method we are checking overrides a method from its base 4037 // don't warn about the other overloaded methods. 4038 if (!Data.S->IsOverload(Data.Method, MD, false)) 4039 return true; 4040 // Collect the overload only if its hidden. 4041 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4042 overloadedMethods.push_back(MD); 4043 } 4044 } 4045 4046 if (foundSameNameMethod) 4047 Data.OverloadedMethods.append(overloadedMethods.begin(), 4048 overloadedMethods.end()); 4049 return foundSameNameMethod; 4050} 4051 4052/// \brief See if a method overloads virtual methods in a base class without 4053/// overriding any. 4054void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4055 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4056 MD->getLocation()) == Diagnostic::Ignored) 4057 return; 4058 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4059 return; 4060 4061 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4062 /*bool RecordPaths=*/false, 4063 /*bool DetectVirtual=*/false); 4064 FindHiddenVirtualMethodData Data; 4065 Data.Method = MD; 4066 Data.S = this; 4067 4068 // Keep the base methods that were overriden or introduced in the subclass 4069 // by 'using' in a set. A base method not in this set is hidden. 4070 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4071 res.first != res.second; ++res.first) { 4072 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4073 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4074 E = MD->end_overridden_methods(); 4075 I != E; ++I) 4076 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4077 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4078 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4079 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4080 } 4081 4082 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4083 !Data.OverloadedMethods.empty()) { 4084 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4085 << MD << (Data.OverloadedMethods.size() > 1); 4086 4087 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4088 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4089 Diag(overloadedMD->getLocation(), 4090 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4091 } 4092 } 4093} 4094 4095void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4096 Decl *TagDecl, 4097 SourceLocation LBrac, 4098 SourceLocation RBrac, 4099 AttributeList *AttrList) { 4100 if (!TagDecl) 4101 return; 4102 4103 AdjustDeclIfTemplate(TagDecl); 4104 4105 ActOnFields(S, RLoc, TagDecl, 4106 // strict aliasing violation! 4107 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4108 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4109 4110 CheckCompletedCXXClass( 4111 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4112} 4113 4114/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4115/// special functions, such as the default constructor, copy 4116/// constructor, or destructor, to the given C++ class (C++ 4117/// [special]p1). This routine can only be executed just before the 4118/// definition of the class is complete. 4119void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4120 if (!ClassDecl->hasUserDeclaredConstructor()) 4121 ++ASTContext::NumImplicitDefaultConstructors; 4122 4123 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4124 ++ASTContext::NumImplicitCopyConstructors; 4125 4126 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4127 ++ASTContext::NumImplicitCopyAssignmentOperators; 4128 4129 // If we have a dynamic class, then the copy assignment operator may be 4130 // virtual, so we have to declare it immediately. This ensures that, e.g., 4131 // it shows up in the right place in the vtable and that we diagnose 4132 // problems with the implicit exception specification. 4133 if (ClassDecl->isDynamicClass()) 4134 DeclareImplicitCopyAssignment(ClassDecl); 4135 } 4136 4137 if (!ClassDecl->hasUserDeclaredDestructor()) { 4138 ++ASTContext::NumImplicitDestructors; 4139 4140 // If we have a dynamic class, then the destructor may be virtual, so we 4141 // have to declare the destructor immediately. This ensures that, e.g., it 4142 // shows up in the right place in the vtable and that we diagnose problems 4143 // with the implicit exception specification. 4144 if (ClassDecl->isDynamicClass()) 4145 DeclareImplicitDestructor(ClassDecl); 4146 } 4147} 4148 4149void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4150 if (!D) 4151 return; 4152 4153 int NumParamList = D->getNumTemplateParameterLists(); 4154 for (int i = 0; i < NumParamList; i++) { 4155 TemplateParameterList* Params = D->getTemplateParameterList(i); 4156 for (TemplateParameterList::iterator Param = Params->begin(), 4157 ParamEnd = Params->end(); 4158 Param != ParamEnd; ++Param) { 4159 NamedDecl *Named = cast<NamedDecl>(*Param); 4160 if (Named->getDeclName()) { 4161 S->AddDecl(Named); 4162 IdResolver.AddDecl(Named); 4163 } 4164 } 4165 } 4166} 4167 4168void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4169 if (!D) 4170 return; 4171 4172 TemplateParameterList *Params = 0; 4173 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4174 Params = Template->getTemplateParameters(); 4175 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4176 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4177 Params = PartialSpec->getTemplateParameters(); 4178 else 4179 return; 4180 4181 for (TemplateParameterList::iterator Param = Params->begin(), 4182 ParamEnd = Params->end(); 4183 Param != ParamEnd; ++Param) { 4184 NamedDecl *Named = cast<NamedDecl>(*Param); 4185 if (Named->getDeclName()) { 4186 S->AddDecl(Named); 4187 IdResolver.AddDecl(Named); 4188 } 4189 } 4190} 4191 4192void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4193 if (!RecordD) return; 4194 AdjustDeclIfTemplate(RecordD); 4195 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4196 PushDeclContext(S, Record); 4197} 4198 4199void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4200 if (!RecordD) return; 4201 PopDeclContext(); 4202} 4203 4204/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4205/// parsing a top-level (non-nested) C++ class, and we are now 4206/// parsing those parts of the given Method declaration that could 4207/// not be parsed earlier (C++ [class.mem]p2), such as default 4208/// arguments. This action should enter the scope of the given 4209/// Method declaration as if we had just parsed the qualified method 4210/// name. However, it should not bring the parameters into scope; 4211/// that will be performed by ActOnDelayedCXXMethodParameter. 4212void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4213} 4214 4215/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4216/// C++ method declaration. We're (re-)introducing the given 4217/// function parameter into scope for use in parsing later parts of 4218/// the method declaration. For example, we could see an 4219/// ActOnParamDefaultArgument event for this parameter. 4220void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4221 if (!ParamD) 4222 return; 4223 4224 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4225 4226 // If this parameter has an unparsed default argument, clear it out 4227 // to make way for the parsed default argument. 4228 if (Param->hasUnparsedDefaultArg()) 4229 Param->setDefaultArg(0); 4230 4231 S->AddDecl(Param); 4232 if (Param->getDeclName()) 4233 IdResolver.AddDecl(Param); 4234} 4235 4236/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4237/// processing the delayed method declaration for Method. The method 4238/// declaration is now considered finished. There may be a separate 4239/// ActOnStartOfFunctionDef action later (not necessarily 4240/// immediately!) for this method, if it was also defined inside the 4241/// class body. 4242void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4243 if (!MethodD) 4244 return; 4245 4246 AdjustDeclIfTemplate(MethodD); 4247 4248 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4249 4250 // Now that we have our default arguments, check the constructor 4251 // again. It could produce additional diagnostics or affect whether 4252 // the class has implicitly-declared destructors, among other 4253 // things. 4254 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4255 CheckConstructor(Constructor); 4256 4257 // Check the default arguments, which we may have added. 4258 if (!Method->isInvalidDecl()) 4259 CheckCXXDefaultArguments(Method); 4260} 4261 4262/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4263/// the well-formedness of the constructor declarator @p D with type @p 4264/// R. If there are any errors in the declarator, this routine will 4265/// emit diagnostics and set the invalid bit to true. In any case, the type 4266/// will be updated to reflect a well-formed type for the constructor and 4267/// returned. 4268QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4269 StorageClass &SC) { 4270 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4271 4272 // C++ [class.ctor]p3: 4273 // A constructor shall not be virtual (10.3) or static (9.4). A 4274 // constructor can be invoked for a const, volatile or const 4275 // volatile object. A constructor shall not be declared const, 4276 // volatile, or const volatile (9.3.2). 4277 if (isVirtual) { 4278 if (!D.isInvalidType()) 4279 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4280 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4281 << SourceRange(D.getIdentifierLoc()); 4282 D.setInvalidType(); 4283 } 4284 if (SC == SC_Static) { 4285 if (!D.isInvalidType()) 4286 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4287 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4288 << SourceRange(D.getIdentifierLoc()); 4289 D.setInvalidType(); 4290 SC = SC_None; 4291 } 4292 4293 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4294 if (FTI.TypeQuals != 0) { 4295 if (FTI.TypeQuals & Qualifiers::Const) 4296 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4297 << "const" << SourceRange(D.getIdentifierLoc()); 4298 if (FTI.TypeQuals & Qualifiers::Volatile) 4299 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4300 << "volatile" << SourceRange(D.getIdentifierLoc()); 4301 if (FTI.TypeQuals & Qualifiers::Restrict) 4302 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4303 << "restrict" << SourceRange(D.getIdentifierLoc()); 4304 D.setInvalidType(); 4305 } 4306 4307 // C++0x [class.ctor]p4: 4308 // A constructor shall not be declared with a ref-qualifier. 4309 if (FTI.hasRefQualifier()) { 4310 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4311 << FTI.RefQualifierIsLValueRef 4312 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4313 D.setInvalidType(); 4314 } 4315 4316 // Rebuild the function type "R" without any type qualifiers (in 4317 // case any of the errors above fired) and with "void" as the 4318 // return type, since constructors don't have return types. 4319 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4320 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4321 return R; 4322 4323 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4324 EPI.TypeQuals = 0; 4325 EPI.RefQualifier = RQ_None; 4326 4327 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4328 Proto->getNumArgs(), EPI); 4329} 4330 4331/// CheckConstructor - Checks a fully-formed constructor for 4332/// well-formedness, issuing any diagnostics required. Returns true if 4333/// the constructor declarator is invalid. 4334void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4335 CXXRecordDecl *ClassDecl 4336 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4337 if (!ClassDecl) 4338 return Constructor->setInvalidDecl(); 4339 4340 // C++ [class.copy]p3: 4341 // A declaration of a constructor for a class X is ill-formed if 4342 // its first parameter is of type (optionally cv-qualified) X and 4343 // either there are no other parameters or else all other 4344 // parameters have default arguments. 4345 if (!Constructor->isInvalidDecl() && 4346 ((Constructor->getNumParams() == 1) || 4347 (Constructor->getNumParams() > 1 && 4348 Constructor->getParamDecl(1)->hasDefaultArg())) && 4349 Constructor->getTemplateSpecializationKind() 4350 != TSK_ImplicitInstantiation) { 4351 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4352 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4353 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4354 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4355 const char *ConstRef 4356 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4357 : " const &"; 4358 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4359 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4360 4361 // FIXME: Rather that making the constructor invalid, we should endeavor 4362 // to fix the type. 4363 Constructor->setInvalidDecl(); 4364 } 4365 } 4366} 4367 4368/// CheckDestructor - Checks a fully-formed destructor definition for 4369/// well-formedness, issuing any diagnostics required. Returns true 4370/// on error. 4371bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4372 CXXRecordDecl *RD = Destructor->getParent(); 4373 4374 if (Destructor->isVirtual()) { 4375 SourceLocation Loc; 4376 4377 if (!Destructor->isImplicit()) 4378 Loc = Destructor->getLocation(); 4379 else 4380 Loc = RD->getLocation(); 4381 4382 // If we have a virtual destructor, look up the deallocation function 4383 FunctionDecl *OperatorDelete = 0; 4384 DeclarationName Name = 4385 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4386 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4387 return true; 4388 4389 MarkDeclarationReferenced(Loc, OperatorDelete); 4390 4391 Destructor->setOperatorDelete(OperatorDelete); 4392 } 4393 4394 return false; 4395} 4396 4397static inline bool 4398FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4399 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4400 FTI.ArgInfo[0].Param && 4401 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4402} 4403 4404/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4405/// the well-formednes of the destructor declarator @p D with type @p 4406/// R. If there are any errors in the declarator, this routine will 4407/// emit diagnostics and set the declarator to invalid. Even if this happens, 4408/// will be updated to reflect a well-formed type for the destructor and 4409/// returned. 4410QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4411 StorageClass& SC) { 4412 // C++ [class.dtor]p1: 4413 // [...] A typedef-name that names a class is a class-name 4414 // (7.1.3); however, a typedef-name that names a class shall not 4415 // be used as the identifier in the declarator for a destructor 4416 // declaration. 4417 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4418 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4419 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4420 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4421 else if (const TemplateSpecializationType *TST = 4422 DeclaratorType->getAs<TemplateSpecializationType>()) 4423 if (TST->isTypeAlias()) 4424 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4425 << DeclaratorType << 1; 4426 4427 // C++ [class.dtor]p2: 4428 // A destructor is used to destroy objects of its class type. A 4429 // destructor takes no parameters, and no return type can be 4430 // specified for it (not even void). The address of a destructor 4431 // shall not be taken. A destructor shall not be static. A 4432 // destructor can be invoked for a const, volatile or const 4433 // volatile object. A destructor shall not be declared const, 4434 // volatile or const volatile (9.3.2). 4435 if (SC == SC_Static) { 4436 if (!D.isInvalidType()) 4437 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4438 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4439 << SourceRange(D.getIdentifierLoc()) 4440 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4441 4442 SC = SC_None; 4443 } 4444 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4445 // Destructors don't have return types, but the parser will 4446 // happily parse something like: 4447 // 4448 // class X { 4449 // float ~X(); 4450 // }; 4451 // 4452 // The return type will be eliminated later. 4453 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4454 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4455 << SourceRange(D.getIdentifierLoc()); 4456 } 4457 4458 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4459 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4460 if (FTI.TypeQuals & Qualifiers::Const) 4461 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4462 << "const" << SourceRange(D.getIdentifierLoc()); 4463 if (FTI.TypeQuals & Qualifiers::Volatile) 4464 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4465 << "volatile" << SourceRange(D.getIdentifierLoc()); 4466 if (FTI.TypeQuals & Qualifiers::Restrict) 4467 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4468 << "restrict" << SourceRange(D.getIdentifierLoc()); 4469 D.setInvalidType(); 4470 } 4471 4472 // C++0x [class.dtor]p2: 4473 // A destructor shall not be declared with a ref-qualifier. 4474 if (FTI.hasRefQualifier()) { 4475 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4476 << FTI.RefQualifierIsLValueRef 4477 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4478 D.setInvalidType(); 4479 } 4480 4481 // Make sure we don't have any parameters. 4482 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4483 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4484 4485 // Delete the parameters. 4486 FTI.freeArgs(); 4487 D.setInvalidType(); 4488 } 4489 4490 // Make sure the destructor isn't variadic. 4491 if (FTI.isVariadic) { 4492 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4493 D.setInvalidType(); 4494 } 4495 4496 // Rebuild the function type "R" without any type qualifiers or 4497 // parameters (in case any of the errors above fired) and with 4498 // "void" as the return type, since destructors don't have return 4499 // types. 4500 if (!D.isInvalidType()) 4501 return R; 4502 4503 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4504 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4505 EPI.Variadic = false; 4506 EPI.TypeQuals = 0; 4507 EPI.RefQualifier = RQ_None; 4508 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4509} 4510 4511/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4512/// well-formednes of the conversion function declarator @p D with 4513/// type @p R. If there are any errors in the declarator, this routine 4514/// will emit diagnostics and return true. Otherwise, it will return 4515/// false. Either way, the type @p R will be updated to reflect a 4516/// well-formed type for the conversion operator. 4517void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4518 StorageClass& SC) { 4519 // C++ [class.conv.fct]p1: 4520 // Neither parameter types nor return type can be specified. The 4521 // type of a conversion function (8.3.5) is "function taking no 4522 // parameter returning conversion-type-id." 4523 if (SC == SC_Static) { 4524 if (!D.isInvalidType()) 4525 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4526 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4527 << SourceRange(D.getIdentifierLoc()); 4528 D.setInvalidType(); 4529 SC = SC_None; 4530 } 4531 4532 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4533 4534 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4535 // Conversion functions don't have return types, but the parser will 4536 // happily parse something like: 4537 // 4538 // class X { 4539 // float operator bool(); 4540 // }; 4541 // 4542 // The return type will be changed later anyway. 4543 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4544 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4545 << SourceRange(D.getIdentifierLoc()); 4546 D.setInvalidType(); 4547 } 4548 4549 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4550 4551 // Make sure we don't have any parameters. 4552 if (Proto->getNumArgs() > 0) { 4553 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4554 4555 // Delete the parameters. 4556 D.getFunctionTypeInfo().freeArgs(); 4557 D.setInvalidType(); 4558 } else if (Proto->isVariadic()) { 4559 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4560 D.setInvalidType(); 4561 } 4562 4563 // Diagnose "&operator bool()" and other such nonsense. This 4564 // is actually a gcc extension which we don't support. 4565 if (Proto->getResultType() != ConvType) { 4566 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4567 << Proto->getResultType(); 4568 D.setInvalidType(); 4569 ConvType = Proto->getResultType(); 4570 } 4571 4572 // C++ [class.conv.fct]p4: 4573 // The conversion-type-id shall not represent a function type nor 4574 // an array type. 4575 if (ConvType->isArrayType()) { 4576 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4577 ConvType = Context.getPointerType(ConvType); 4578 D.setInvalidType(); 4579 } else if (ConvType->isFunctionType()) { 4580 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4581 ConvType = Context.getPointerType(ConvType); 4582 D.setInvalidType(); 4583 } 4584 4585 // Rebuild the function type "R" without any parameters (in case any 4586 // of the errors above fired) and with the conversion type as the 4587 // return type. 4588 if (D.isInvalidType()) 4589 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4590 4591 // C++0x explicit conversion operators. 4592 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4593 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4594 diag::warn_explicit_conversion_functions) 4595 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4596} 4597 4598/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4599/// the declaration of the given C++ conversion function. This routine 4600/// is responsible for recording the conversion function in the C++ 4601/// class, if possible. 4602Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4603 assert(Conversion && "Expected to receive a conversion function declaration"); 4604 4605 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4606 4607 // Make sure we aren't redeclaring the conversion function. 4608 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4609 4610 // C++ [class.conv.fct]p1: 4611 // [...] A conversion function is never used to convert a 4612 // (possibly cv-qualified) object to the (possibly cv-qualified) 4613 // same object type (or a reference to it), to a (possibly 4614 // cv-qualified) base class of that type (or a reference to it), 4615 // or to (possibly cv-qualified) void. 4616 // FIXME: Suppress this warning if the conversion function ends up being a 4617 // virtual function that overrides a virtual function in a base class. 4618 QualType ClassType 4619 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4620 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4621 ConvType = ConvTypeRef->getPointeeType(); 4622 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4623 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4624 /* Suppress diagnostics for instantiations. */; 4625 else if (ConvType->isRecordType()) { 4626 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4627 if (ConvType == ClassType) 4628 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4629 << ClassType; 4630 else if (IsDerivedFrom(ClassType, ConvType)) 4631 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4632 << ClassType << ConvType; 4633 } else if (ConvType->isVoidType()) { 4634 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4635 << ClassType << ConvType; 4636 } 4637 4638 if (FunctionTemplateDecl *ConversionTemplate 4639 = Conversion->getDescribedFunctionTemplate()) 4640 return ConversionTemplate; 4641 4642 return Conversion; 4643} 4644 4645//===----------------------------------------------------------------------===// 4646// Namespace Handling 4647//===----------------------------------------------------------------------===// 4648 4649 4650 4651/// ActOnStartNamespaceDef - This is called at the start of a namespace 4652/// definition. 4653Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4654 SourceLocation InlineLoc, 4655 SourceLocation NamespaceLoc, 4656 SourceLocation IdentLoc, 4657 IdentifierInfo *II, 4658 SourceLocation LBrace, 4659 AttributeList *AttrList) { 4660 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4661 // For anonymous namespace, take the location of the left brace. 4662 SourceLocation Loc = II ? IdentLoc : LBrace; 4663 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4664 StartLoc, Loc, II); 4665 Namespc->setInline(InlineLoc.isValid()); 4666 4667 Scope *DeclRegionScope = NamespcScope->getParent(); 4668 4669 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4670 4671 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4672 PushNamespaceVisibilityAttr(Attr); 4673 4674 if (II) { 4675 // C++ [namespace.def]p2: 4676 // The identifier in an original-namespace-definition shall not 4677 // have been previously defined in the declarative region in 4678 // which the original-namespace-definition appears. The 4679 // identifier in an original-namespace-definition is the name of 4680 // the namespace. Subsequently in that declarative region, it is 4681 // treated as an original-namespace-name. 4682 // 4683 // Since namespace names are unique in their scope, and we don't 4684 // look through using directives, just look for any ordinary names. 4685 4686 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4687 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4688 Decl::IDNS_Namespace; 4689 NamedDecl *PrevDecl = 0; 4690 for (DeclContext::lookup_result R 4691 = CurContext->getRedeclContext()->lookup(II); 4692 R.first != R.second; ++R.first) { 4693 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4694 PrevDecl = *R.first; 4695 break; 4696 } 4697 } 4698 4699 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4700 // This is an extended namespace definition. 4701 if (Namespc->isInline() != OrigNS->isInline()) { 4702 // inline-ness must match 4703 if (OrigNS->isInline()) { 4704 // The user probably just forgot the 'inline', so suggest that it 4705 // be added back. 4706 Diag(Namespc->getLocation(), 4707 diag::warn_inline_namespace_reopened_noninline) 4708 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4709 } else { 4710 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4711 << Namespc->isInline(); 4712 } 4713 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4714 4715 // Recover by ignoring the new namespace's inline status. 4716 Namespc->setInline(OrigNS->isInline()); 4717 } 4718 4719 // Attach this namespace decl to the chain of extended namespace 4720 // definitions. 4721 OrigNS->setNextNamespace(Namespc); 4722 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4723 4724 // Remove the previous declaration from the scope. 4725 if (DeclRegionScope->isDeclScope(OrigNS)) { 4726 IdResolver.RemoveDecl(OrigNS); 4727 DeclRegionScope->RemoveDecl(OrigNS); 4728 } 4729 } else if (PrevDecl) { 4730 // This is an invalid name redefinition. 4731 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4732 << Namespc->getDeclName(); 4733 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4734 Namespc->setInvalidDecl(); 4735 // Continue on to push Namespc as current DeclContext and return it. 4736 } else if (II->isStr("std") && 4737 CurContext->getRedeclContext()->isTranslationUnit()) { 4738 // This is the first "real" definition of the namespace "std", so update 4739 // our cache of the "std" namespace to point at this definition. 4740 if (NamespaceDecl *StdNS = getStdNamespace()) { 4741 // We had already defined a dummy namespace "std". Link this new 4742 // namespace definition to the dummy namespace "std". 4743 StdNS->setNextNamespace(Namespc); 4744 StdNS->setLocation(IdentLoc); 4745 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4746 } 4747 4748 // Make our StdNamespace cache point at the first real definition of the 4749 // "std" namespace. 4750 StdNamespace = Namespc; 4751 4752 // Add this instance of "std" to the set of known namespaces 4753 KnownNamespaces[Namespc] = false; 4754 } else if (!Namespc->isInline()) { 4755 // Since this is an "original" namespace, add it to the known set of 4756 // namespaces if it is not an inline namespace. 4757 KnownNamespaces[Namespc] = false; 4758 } 4759 4760 PushOnScopeChains(Namespc, DeclRegionScope); 4761 } else { 4762 // Anonymous namespaces. 4763 assert(Namespc->isAnonymousNamespace()); 4764 4765 // Link the anonymous namespace into its parent. 4766 NamespaceDecl *PrevDecl; 4767 DeclContext *Parent = CurContext->getRedeclContext(); 4768 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4769 PrevDecl = TU->getAnonymousNamespace(); 4770 TU->setAnonymousNamespace(Namespc); 4771 } else { 4772 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4773 PrevDecl = ND->getAnonymousNamespace(); 4774 ND->setAnonymousNamespace(Namespc); 4775 } 4776 4777 // Link the anonymous namespace with its previous declaration. 4778 if (PrevDecl) { 4779 assert(PrevDecl->isAnonymousNamespace()); 4780 assert(!PrevDecl->getNextNamespace()); 4781 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4782 PrevDecl->setNextNamespace(Namespc); 4783 4784 if (Namespc->isInline() != PrevDecl->isInline()) { 4785 // inline-ness must match 4786 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4787 << Namespc->isInline(); 4788 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4789 Namespc->setInvalidDecl(); 4790 // Recover by ignoring the new namespace's inline status. 4791 Namespc->setInline(PrevDecl->isInline()); 4792 } 4793 } 4794 4795 CurContext->addDecl(Namespc); 4796 4797 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4798 // behaves as if it were replaced by 4799 // namespace unique { /* empty body */ } 4800 // using namespace unique; 4801 // namespace unique { namespace-body } 4802 // where all occurrences of 'unique' in a translation unit are 4803 // replaced by the same identifier and this identifier differs 4804 // from all other identifiers in the entire program. 4805 4806 // We just create the namespace with an empty name and then add an 4807 // implicit using declaration, just like the standard suggests. 4808 // 4809 // CodeGen enforces the "universally unique" aspect by giving all 4810 // declarations semantically contained within an anonymous 4811 // namespace internal linkage. 4812 4813 if (!PrevDecl) { 4814 UsingDirectiveDecl* UD 4815 = UsingDirectiveDecl::Create(Context, CurContext, 4816 /* 'using' */ LBrace, 4817 /* 'namespace' */ SourceLocation(), 4818 /* qualifier */ NestedNameSpecifierLoc(), 4819 /* identifier */ SourceLocation(), 4820 Namespc, 4821 /* Ancestor */ CurContext); 4822 UD->setImplicit(); 4823 CurContext->addDecl(UD); 4824 } 4825 } 4826 4827 // Although we could have an invalid decl (i.e. the namespace name is a 4828 // redefinition), push it as current DeclContext and try to continue parsing. 4829 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4830 // for the namespace has the declarations that showed up in that particular 4831 // namespace definition. 4832 PushDeclContext(NamespcScope, Namespc); 4833 return Namespc; 4834} 4835 4836/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4837/// is a namespace alias, returns the namespace it points to. 4838static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4839 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4840 return AD->getNamespace(); 4841 return dyn_cast_or_null<NamespaceDecl>(D); 4842} 4843 4844/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4845/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4846void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4847 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4848 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4849 Namespc->setRBraceLoc(RBrace); 4850 PopDeclContext(); 4851 if (Namespc->hasAttr<VisibilityAttr>()) 4852 PopPragmaVisibility(); 4853} 4854 4855CXXRecordDecl *Sema::getStdBadAlloc() const { 4856 return cast_or_null<CXXRecordDecl>( 4857 StdBadAlloc.get(Context.getExternalSource())); 4858} 4859 4860NamespaceDecl *Sema::getStdNamespace() const { 4861 return cast_or_null<NamespaceDecl>( 4862 StdNamespace.get(Context.getExternalSource())); 4863} 4864 4865/// \brief Retrieve the special "std" namespace, which may require us to 4866/// implicitly define the namespace. 4867NamespaceDecl *Sema::getOrCreateStdNamespace() { 4868 if (!StdNamespace) { 4869 // The "std" namespace has not yet been defined, so build one implicitly. 4870 StdNamespace = NamespaceDecl::Create(Context, 4871 Context.getTranslationUnitDecl(), 4872 SourceLocation(), SourceLocation(), 4873 &PP.getIdentifierTable().get("std")); 4874 getStdNamespace()->setImplicit(true); 4875 } 4876 4877 return getStdNamespace(); 4878} 4879 4880/// \brief Determine whether a using statement is in a context where it will be 4881/// apply in all contexts. 4882static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4883 switch (CurContext->getDeclKind()) { 4884 case Decl::TranslationUnit: 4885 return true; 4886 case Decl::LinkageSpec: 4887 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4888 default: 4889 return false; 4890 } 4891} 4892 4893static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 4894 CXXScopeSpec &SS, 4895 SourceLocation IdentLoc, 4896 IdentifierInfo *Ident) { 4897 R.clear(); 4898 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 4899 R.getLookupKind(), Sc, &SS, NULL, 4900 false, S.CTC_NoKeywords, NULL)) { 4901 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 4902 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 4903 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 4904 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 4905 if (DeclContext *DC = S.computeDeclContext(SS, false)) 4906 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 4907 << Ident << DC << CorrectedQuotedStr << SS.getRange() 4908 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4909 else 4910 S.Diag(IdentLoc, diag::err_using_directive_suggest) 4911 << Ident << CorrectedQuotedStr 4912 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4913 4914 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 4915 diag::note_namespace_defined_here) << CorrectedQuotedStr; 4916 4917 Ident = Corrected.getCorrectionAsIdentifierInfo(); 4918 R.addDecl(Corrected.getCorrectionDecl()); 4919 return true; 4920 } 4921 R.setLookupName(Ident); 4922 } 4923 return false; 4924} 4925 4926Decl *Sema::ActOnUsingDirective(Scope *S, 4927 SourceLocation UsingLoc, 4928 SourceLocation NamespcLoc, 4929 CXXScopeSpec &SS, 4930 SourceLocation IdentLoc, 4931 IdentifierInfo *NamespcName, 4932 AttributeList *AttrList) { 4933 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4934 assert(NamespcName && "Invalid NamespcName."); 4935 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4936 4937 // This can only happen along a recovery path. 4938 while (S->getFlags() & Scope::TemplateParamScope) 4939 S = S->getParent(); 4940 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4941 4942 UsingDirectiveDecl *UDir = 0; 4943 NestedNameSpecifier *Qualifier = 0; 4944 if (SS.isSet()) 4945 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4946 4947 // Lookup namespace name. 4948 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4949 LookupParsedName(R, S, &SS); 4950 if (R.isAmbiguous()) 4951 return 0; 4952 4953 if (R.empty()) { 4954 R.clear(); 4955 // Allow "using namespace std;" or "using namespace ::std;" even if 4956 // "std" hasn't been defined yet, for GCC compatibility. 4957 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4958 NamespcName->isStr("std")) { 4959 Diag(IdentLoc, diag::ext_using_undefined_std); 4960 R.addDecl(getOrCreateStdNamespace()); 4961 R.resolveKind(); 4962 } 4963 // Otherwise, attempt typo correction. 4964 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 4965 } 4966 4967 if (!R.empty()) { 4968 NamedDecl *Named = R.getFoundDecl(); 4969 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4970 && "expected namespace decl"); 4971 // C++ [namespace.udir]p1: 4972 // A using-directive specifies that the names in the nominated 4973 // namespace can be used in the scope in which the 4974 // using-directive appears after the using-directive. During 4975 // unqualified name lookup (3.4.1), the names appear as if they 4976 // were declared in the nearest enclosing namespace which 4977 // contains both the using-directive and the nominated 4978 // namespace. [Note: in this context, "contains" means "contains 4979 // directly or indirectly". ] 4980 4981 // Find enclosing context containing both using-directive and 4982 // nominated namespace. 4983 NamespaceDecl *NS = getNamespaceDecl(Named); 4984 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4985 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4986 CommonAncestor = CommonAncestor->getParent(); 4987 4988 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4989 SS.getWithLocInContext(Context), 4990 IdentLoc, Named, CommonAncestor); 4991 4992 if (IsUsingDirectiveInToplevelContext(CurContext) && 4993 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 4994 Diag(IdentLoc, diag::warn_using_directive_in_header); 4995 } 4996 4997 PushUsingDirective(S, UDir); 4998 } else { 4999 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5000 } 5001 5002 // FIXME: We ignore attributes for now. 5003 return UDir; 5004} 5005 5006void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5007 // If scope has associated entity, then using directive is at namespace 5008 // or translation unit scope. We add UsingDirectiveDecls, into 5009 // it's lookup structure. 5010 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5011 Ctx->addDecl(UDir); 5012 else 5013 // Otherwise it is block-sope. using-directives will affect lookup 5014 // only to the end of scope. 5015 S->PushUsingDirective(UDir); 5016} 5017 5018 5019Decl *Sema::ActOnUsingDeclaration(Scope *S, 5020 AccessSpecifier AS, 5021 bool HasUsingKeyword, 5022 SourceLocation UsingLoc, 5023 CXXScopeSpec &SS, 5024 UnqualifiedId &Name, 5025 AttributeList *AttrList, 5026 bool IsTypeName, 5027 SourceLocation TypenameLoc) { 5028 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5029 5030 switch (Name.getKind()) { 5031 case UnqualifiedId::IK_ImplicitSelfParam: 5032 case UnqualifiedId::IK_Identifier: 5033 case UnqualifiedId::IK_OperatorFunctionId: 5034 case UnqualifiedId::IK_LiteralOperatorId: 5035 case UnqualifiedId::IK_ConversionFunctionId: 5036 break; 5037 5038 case UnqualifiedId::IK_ConstructorName: 5039 case UnqualifiedId::IK_ConstructorTemplateId: 5040 // C++0x inherited constructors. 5041 if (getLangOptions().CPlusPlus0x) break; 5042 5043 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5044 << SS.getRange(); 5045 return 0; 5046 5047 case UnqualifiedId::IK_DestructorName: 5048 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5049 << SS.getRange(); 5050 return 0; 5051 5052 case UnqualifiedId::IK_TemplateId: 5053 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5054 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5055 return 0; 5056 } 5057 5058 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5059 DeclarationName TargetName = TargetNameInfo.getName(); 5060 if (!TargetName) 5061 return 0; 5062 5063 // Warn about using declarations. 5064 // TODO: store that the declaration was written without 'using' and 5065 // talk about access decls instead of using decls in the 5066 // diagnostics. 5067 if (!HasUsingKeyword) { 5068 UsingLoc = Name.getSourceRange().getBegin(); 5069 5070 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5071 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5072 } 5073 5074 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5075 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5076 return 0; 5077 5078 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5079 TargetNameInfo, AttrList, 5080 /* IsInstantiation */ false, 5081 IsTypeName, TypenameLoc); 5082 if (UD) 5083 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5084 5085 return UD; 5086} 5087 5088/// \brief Determine whether a using declaration considers the given 5089/// declarations as "equivalent", e.g., if they are redeclarations of 5090/// the same entity or are both typedefs of the same type. 5091static bool 5092IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5093 bool &SuppressRedeclaration) { 5094 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5095 SuppressRedeclaration = false; 5096 return true; 5097 } 5098 5099 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5100 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5101 SuppressRedeclaration = true; 5102 return Context.hasSameType(TD1->getUnderlyingType(), 5103 TD2->getUnderlyingType()); 5104 } 5105 5106 return false; 5107} 5108 5109 5110/// Determines whether to create a using shadow decl for a particular 5111/// decl, given the set of decls existing prior to this using lookup. 5112bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5113 const LookupResult &Previous) { 5114 // Diagnose finding a decl which is not from a base class of the 5115 // current class. We do this now because there are cases where this 5116 // function will silently decide not to build a shadow decl, which 5117 // will pre-empt further diagnostics. 5118 // 5119 // We don't need to do this in C++0x because we do the check once on 5120 // the qualifier. 5121 // 5122 // FIXME: diagnose the following if we care enough: 5123 // struct A { int foo; }; 5124 // struct B : A { using A::foo; }; 5125 // template <class T> struct C : A {}; 5126 // template <class T> struct D : C<T> { using B::foo; } // <--- 5127 // This is invalid (during instantiation) in C++03 because B::foo 5128 // resolves to the using decl in B, which is not a base class of D<T>. 5129 // We can't diagnose it immediately because C<T> is an unknown 5130 // specialization. The UsingShadowDecl in D<T> then points directly 5131 // to A::foo, which will look well-formed when we instantiate. 5132 // The right solution is to not collapse the shadow-decl chain. 5133 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5134 DeclContext *OrigDC = Orig->getDeclContext(); 5135 5136 // Handle enums and anonymous structs. 5137 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5138 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5139 while (OrigRec->isAnonymousStructOrUnion()) 5140 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5141 5142 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5143 if (OrigDC == CurContext) { 5144 Diag(Using->getLocation(), 5145 diag::err_using_decl_nested_name_specifier_is_current_class) 5146 << Using->getQualifierLoc().getSourceRange(); 5147 Diag(Orig->getLocation(), diag::note_using_decl_target); 5148 return true; 5149 } 5150 5151 Diag(Using->getQualifierLoc().getBeginLoc(), 5152 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5153 << Using->getQualifier() 5154 << cast<CXXRecordDecl>(CurContext) 5155 << Using->getQualifierLoc().getSourceRange(); 5156 Diag(Orig->getLocation(), diag::note_using_decl_target); 5157 return true; 5158 } 5159 } 5160 5161 if (Previous.empty()) return false; 5162 5163 NamedDecl *Target = Orig; 5164 if (isa<UsingShadowDecl>(Target)) 5165 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5166 5167 // If the target happens to be one of the previous declarations, we 5168 // don't have a conflict. 5169 // 5170 // FIXME: but we might be increasing its access, in which case we 5171 // should redeclare it. 5172 NamedDecl *NonTag = 0, *Tag = 0; 5173 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5174 I != E; ++I) { 5175 NamedDecl *D = (*I)->getUnderlyingDecl(); 5176 bool Result; 5177 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5178 return Result; 5179 5180 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5181 } 5182 5183 if (Target->isFunctionOrFunctionTemplate()) { 5184 FunctionDecl *FD; 5185 if (isa<FunctionTemplateDecl>(Target)) 5186 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5187 else 5188 FD = cast<FunctionDecl>(Target); 5189 5190 NamedDecl *OldDecl = 0; 5191 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5192 case Ovl_Overload: 5193 return false; 5194 5195 case Ovl_NonFunction: 5196 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5197 break; 5198 5199 // We found a decl with the exact signature. 5200 case Ovl_Match: 5201 // If we're in a record, we want to hide the target, so we 5202 // return true (without a diagnostic) to tell the caller not to 5203 // build a shadow decl. 5204 if (CurContext->isRecord()) 5205 return true; 5206 5207 // If we're not in a record, this is an error. 5208 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5209 break; 5210 } 5211 5212 Diag(Target->getLocation(), diag::note_using_decl_target); 5213 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5214 return true; 5215 } 5216 5217 // Target is not a function. 5218 5219 if (isa<TagDecl>(Target)) { 5220 // No conflict between a tag and a non-tag. 5221 if (!Tag) return false; 5222 5223 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5224 Diag(Target->getLocation(), diag::note_using_decl_target); 5225 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5226 return true; 5227 } 5228 5229 // No conflict between a tag and a non-tag. 5230 if (!NonTag) return false; 5231 5232 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5233 Diag(Target->getLocation(), diag::note_using_decl_target); 5234 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5235 return true; 5236} 5237 5238/// Builds a shadow declaration corresponding to a 'using' declaration. 5239UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5240 UsingDecl *UD, 5241 NamedDecl *Orig) { 5242 5243 // If we resolved to another shadow declaration, just coalesce them. 5244 NamedDecl *Target = Orig; 5245 if (isa<UsingShadowDecl>(Target)) { 5246 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5247 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5248 } 5249 5250 UsingShadowDecl *Shadow 5251 = UsingShadowDecl::Create(Context, CurContext, 5252 UD->getLocation(), UD, Target); 5253 UD->addShadowDecl(Shadow); 5254 5255 Shadow->setAccess(UD->getAccess()); 5256 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5257 Shadow->setInvalidDecl(); 5258 5259 if (S) 5260 PushOnScopeChains(Shadow, S); 5261 else 5262 CurContext->addDecl(Shadow); 5263 5264 5265 return Shadow; 5266} 5267 5268/// Hides a using shadow declaration. This is required by the current 5269/// using-decl implementation when a resolvable using declaration in a 5270/// class is followed by a declaration which would hide or override 5271/// one or more of the using decl's targets; for example: 5272/// 5273/// struct Base { void foo(int); }; 5274/// struct Derived : Base { 5275/// using Base::foo; 5276/// void foo(int); 5277/// }; 5278/// 5279/// The governing language is C++03 [namespace.udecl]p12: 5280/// 5281/// When a using-declaration brings names from a base class into a 5282/// derived class scope, member functions in the derived class 5283/// override and/or hide member functions with the same name and 5284/// parameter types in a base class (rather than conflicting). 5285/// 5286/// There are two ways to implement this: 5287/// (1) optimistically create shadow decls when they're not hidden 5288/// by existing declarations, or 5289/// (2) don't create any shadow decls (or at least don't make them 5290/// visible) until we've fully parsed/instantiated the class. 5291/// The problem with (1) is that we might have to retroactively remove 5292/// a shadow decl, which requires several O(n) operations because the 5293/// decl structures are (very reasonably) not designed for removal. 5294/// (2) avoids this but is very fiddly and phase-dependent. 5295void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5296 if (Shadow->getDeclName().getNameKind() == 5297 DeclarationName::CXXConversionFunctionName) 5298 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5299 5300 // Remove it from the DeclContext... 5301 Shadow->getDeclContext()->removeDecl(Shadow); 5302 5303 // ...and the scope, if applicable... 5304 if (S) { 5305 S->RemoveDecl(Shadow); 5306 IdResolver.RemoveDecl(Shadow); 5307 } 5308 5309 // ...and the using decl. 5310 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5311 5312 // TODO: complain somehow if Shadow was used. It shouldn't 5313 // be possible for this to happen, because...? 5314} 5315 5316/// Builds a using declaration. 5317/// 5318/// \param IsInstantiation - Whether this call arises from an 5319/// instantiation of an unresolved using declaration. We treat 5320/// the lookup differently for these declarations. 5321NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5322 SourceLocation UsingLoc, 5323 CXXScopeSpec &SS, 5324 const DeclarationNameInfo &NameInfo, 5325 AttributeList *AttrList, 5326 bool IsInstantiation, 5327 bool IsTypeName, 5328 SourceLocation TypenameLoc) { 5329 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5330 SourceLocation IdentLoc = NameInfo.getLoc(); 5331 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5332 5333 // FIXME: We ignore attributes for now. 5334 5335 if (SS.isEmpty()) { 5336 Diag(IdentLoc, diag::err_using_requires_qualname); 5337 return 0; 5338 } 5339 5340 // Do the redeclaration lookup in the current scope. 5341 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5342 ForRedeclaration); 5343 Previous.setHideTags(false); 5344 if (S) { 5345 LookupName(Previous, S); 5346 5347 // It is really dumb that we have to do this. 5348 LookupResult::Filter F = Previous.makeFilter(); 5349 while (F.hasNext()) { 5350 NamedDecl *D = F.next(); 5351 if (!isDeclInScope(D, CurContext, S)) 5352 F.erase(); 5353 } 5354 F.done(); 5355 } else { 5356 assert(IsInstantiation && "no scope in non-instantiation"); 5357 assert(CurContext->isRecord() && "scope not record in instantiation"); 5358 LookupQualifiedName(Previous, CurContext); 5359 } 5360 5361 // Check for invalid redeclarations. 5362 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5363 return 0; 5364 5365 // Check for bad qualifiers. 5366 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5367 return 0; 5368 5369 DeclContext *LookupContext = computeDeclContext(SS); 5370 NamedDecl *D; 5371 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5372 if (!LookupContext) { 5373 if (IsTypeName) { 5374 // FIXME: not all declaration name kinds are legal here 5375 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5376 UsingLoc, TypenameLoc, 5377 QualifierLoc, 5378 IdentLoc, NameInfo.getName()); 5379 } else { 5380 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5381 QualifierLoc, NameInfo); 5382 } 5383 } else { 5384 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5385 NameInfo, IsTypeName); 5386 } 5387 D->setAccess(AS); 5388 CurContext->addDecl(D); 5389 5390 if (!LookupContext) return D; 5391 UsingDecl *UD = cast<UsingDecl>(D); 5392 5393 if (RequireCompleteDeclContext(SS, LookupContext)) { 5394 UD->setInvalidDecl(); 5395 return UD; 5396 } 5397 5398 // Constructor inheriting using decls get special treatment. 5399 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5400 if (CheckInheritedConstructorUsingDecl(UD)) 5401 UD->setInvalidDecl(); 5402 return UD; 5403 } 5404 5405 // Otherwise, look up the target name. 5406 5407 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5408 R.setUsingDeclaration(true); 5409 5410 // Unlike most lookups, we don't always want to hide tag 5411 // declarations: tag names are visible through the using declaration 5412 // even if hidden by ordinary names, *except* in a dependent context 5413 // where it's important for the sanity of two-phase lookup. 5414 if (!IsInstantiation) 5415 R.setHideTags(false); 5416 5417 LookupQualifiedName(R, LookupContext); 5418 5419 if (R.empty()) { 5420 Diag(IdentLoc, diag::err_no_member) 5421 << NameInfo.getName() << LookupContext << SS.getRange(); 5422 UD->setInvalidDecl(); 5423 return UD; 5424 } 5425 5426 if (R.isAmbiguous()) { 5427 UD->setInvalidDecl(); 5428 return UD; 5429 } 5430 5431 if (IsTypeName) { 5432 // If we asked for a typename and got a non-type decl, error out. 5433 if (!R.getAsSingle<TypeDecl>()) { 5434 Diag(IdentLoc, diag::err_using_typename_non_type); 5435 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5436 Diag((*I)->getUnderlyingDecl()->getLocation(), 5437 diag::note_using_decl_target); 5438 UD->setInvalidDecl(); 5439 return UD; 5440 } 5441 } else { 5442 // If we asked for a non-typename and we got a type, error out, 5443 // but only if this is an instantiation of an unresolved using 5444 // decl. Otherwise just silently find the type name. 5445 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5446 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5447 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5448 UD->setInvalidDecl(); 5449 return UD; 5450 } 5451 } 5452 5453 // C++0x N2914 [namespace.udecl]p6: 5454 // A using-declaration shall not name a namespace. 5455 if (R.getAsSingle<NamespaceDecl>()) { 5456 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5457 << SS.getRange(); 5458 UD->setInvalidDecl(); 5459 return UD; 5460 } 5461 5462 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5463 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5464 BuildUsingShadowDecl(S, UD, *I); 5465 } 5466 5467 return UD; 5468} 5469 5470/// Additional checks for a using declaration referring to a constructor name. 5471bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5472 if (UD->isTypeName()) { 5473 // FIXME: Cannot specify typename when specifying constructor 5474 return true; 5475 } 5476 5477 const Type *SourceType = UD->getQualifier()->getAsType(); 5478 assert(SourceType && 5479 "Using decl naming constructor doesn't have type in scope spec."); 5480 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5481 5482 // Check whether the named type is a direct base class. 5483 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5484 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5485 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5486 BaseIt != BaseE; ++BaseIt) { 5487 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5488 if (CanonicalSourceType == BaseType) 5489 break; 5490 } 5491 5492 if (BaseIt == BaseE) { 5493 // Did not find SourceType in the bases. 5494 Diag(UD->getUsingLocation(), 5495 diag::err_using_decl_constructor_not_in_direct_base) 5496 << UD->getNameInfo().getSourceRange() 5497 << QualType(SourceType, 0) << TargetClass; 5498 return true; 5499 } 5500 5501 BaseIt->setInheritConstructors(); 5502 5503 return false; 5504} 5505 5506/// Checks that the given using declaration is not an invalid 5507/// redeclaration. Note that this is checking only for the using decl 5508/// itself, not for any ill-formedness among the UsingShadowDecls. 5509bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5510 bool isTypeName, 5511 const CXXScopeSpec &SS, 5512 SourceLocation NameLoc, 5513 const LookupResult &Prev) { 5514 // C++03 [namespace.udecl]p8: 5515 // C++0x [namespace.udecl]p10: 5516 // A using-declaration is a declaration and can therefore be used 5517 // repeatedly where (and only where) multiple declarations are 5518 // allowed. 5519 // 5520 // That's in non-member contexts. 5521 if (!CurContext->getRedeclContext()->isRecord()) 5522 return false; 5523 5524 NestedNameSpecifier *Qual 5525 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5526 5527 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5528 NamedDecl *D = *I; 5529 5530 bool DTypename; 5531 NestedNameSpecifier *DQual; 5532 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5533 DTypename = UD->isTypeName(); 5534 DQual = UD->getQualifier(); 5535 } else if (UnresolvedUsingValueDecl *UD 5536 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5537 DTypename = false; 5538 DQual = UD->getQualifier(); 5539 } else if (UnresolvedUsingTypenameDecl *UD 5540 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5541 DTypename = true; 5542 DQual = UD->getQualifier(); 5543 } else continue; 5544 5545 // using decls differ if one says 'typename' and the other doesn't. 5546 // FIXME: non-dependent using decls? 5547 if (isTypeName != DTypename) continue; 5548 5549 // using decls differ if they name different scopes (but note that 5550 // template instantiation can cause this check to trigger when it 5551 // didn't before instantiation). 5552 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5553 Context.getCanonicalNestedNameSpecifier(DQual)) 5554 continue; 5555 5556 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5557 Diag(D->getLocation(), diag::note_using_decl) << 1; 5558 return true; 5559 } 5560 5561 return false; 5562} 5563 5564 5565/// Checks that the given nested-name qualifier used in a using decl 5566/// in the current context is appropriately related to the current 5567/// scope. If an error is found, diagnoses it and returns true. 5568bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5569 const CXXScopeSpec &SS, 5570 SourceLocation NameLoc) { 5571 DeclContext *NamedContext = computeDeclContext(SS); 5572 5573 if (!CurContext->isRecord()) { 5574 // C++03 [namespace.udecl]p3: 5575 // C++0x [namespace.udecl]p8: 5576 // A using-declaration for a class member shall be a member-declaration. 5577 5578 // If we weren't able to compute a valid scope, it must be a 5579 // dependent class scope. 5580 if (!NamedContext || NamedContext->isRecord()) { 5581 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5582 << SS.getRange(); 5583 return true; 5584 } 5585 5586 // Otherwise, everything is known to be fine. 5587 return false; 5588 } 5589 5590 // The current scope is a record. 5591 5592 // If the named context is dependent, we can't decide much. 5593 if (!NamedContext) { 5594 // FIXME: in C++0x, we can diagnose if we can prove that the 5595 // nested-name-specifier does not refer to a base class, which is 5596 // still possible in some cases. 5597 5598 // Otherwise we have to conservatively report that things might be 5599 // okay. 5600 return false; 5601 } 5602 5603 if (!NamedContext->isRecord()) { 5604 // Ideally this would point at the last name in the specifier, 5605 // but we don't have that level of source info. 5606 Diag(SS.getRange().getBegin(), 5607 diag::err_using_decl_nested_name_specifier_is_not_class) 5608 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5609 return true; 5610 } 5611 5612 if (!NamedContext->isDependentContext() && 5613 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5614 return true; 5615 5616 if (getLangOptions().CPlusPlus0x) { 5617 // C++0x [namespace.udecl]p3: 5618 // In a using-declaration used as a member-declaration, the 5619 // nested-name-specifier shall name a base class of the class 5620 // being defined. 5621 5622 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5623 cast<CXXRecordDecl>(NamedContext))) { 5624 if (CurContext == NamedContext) { 5625 Diag(NameLoc, 5626 diag::err_using_decl_nested_name_specifier_is_current_class) 5627 << SS.getRange(); 5628 return true; 5629 } 5630 5631 Diag(SS.getRange().getBegin(), 5632 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5633 << (NestedNameSpecifier*) SS.getScopeRep() 5634 << cast<CXXRecordDecl>(CurContext) 5635 << SS.getRange(); 5636 return true; 5637 } 5638 5639 return false; 5640 } 5641 5642 // C++03 [namespace.udecl]p4: 5643 // A using-declaration used as a member-declaration shall refer 5644 // to a member of a base class of the class being defined [etc.]. 5645 5646 // Salient point: SS doesn't have to name a base class as long as 5647 // lookup only finds members from base classes. Therefore we can 5648 // diagnose here only if we can prove that that can't happen, 5649 // i.e. if the class hierarchies provably don't intersect. 5650 5651 // TODO: it would be nice if "definitely valid" results were cached 5652 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5653 // need to be repeated. 5654 5655 struct UserData { 5656 llvm::DenseSet<const CXXRecordDecl*> Bases; 5657 5658 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5659 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5660 Data->Bases.insert(Base); 5661 return true; 5662 } 5663 5664 bool hasDependentBases(const CXXRecordDecl *Class) { 5665 return !Class->forallBases(collect, this); 5666 } 5667 5668 /// Returns true if the base is dependent or is one of the 5669 /// accumulated base classes. 5670 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5671 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5672 return !Data->Bases.count(Base); 5673 } 5674 5675 bool mightShareBases(const CXXRecordDecl *Class) { 5676 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5677 } 5678 }; 5679 5680 UserData Data; 5681 5682 // Returns false if we find a dependent base. 5683 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5684 return false; 5685 5686 // Returns false if the class has a dependent base or if it or one 5687 // of its bases is present in the base set of the current context. 5688 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5689 return false; 5690 5691 Diag(SS.getRange().getBegin(), 5692 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5693 << (NestedNameSpecifier*) SS.getScopeRep() 5694 << cast<CXXRecordDecl>(CurContext) 5695 << SS.getRange(); 5696 5697 return true; 5698} 5699 5700Decl *Sema::ActOnAliasDeclaration(Scope *S, 5701 AccessSpecifier AS, 5702 MultiTemplateParamsArg TemplateParamLists, 5703 SourceLocation UsingLoc, 5704 UnqualifiedId &Name, 5705 TypeResult Type) { 5706 // Skip up to the relevant declaration scope. 5707 while (S->getFlags() & Scope::TemplateParamScope) 5708 S = S->getParent(); 5709 assert((S->getFlags() & Scope::DeclScope) && 5710 "got alias-declaration outside of declaration scope"); 5711 5712 if (Type.isInvalid()) 5713 return 0; 5714 5715 bool Invalid = false; 5716 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5717 TypeSourceInfo *TInfo = 0; 5718 GetTypeFromParser(Type.get(), &TInfo); 5719 5720 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5721 return 0; 5722 5723 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5724 UPPC_DeclarationType)) { 5725 Invalid = true; 5726 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5727 TInfo->getTypeLoc().getBeginLoc()); 5728 } 5729 5730 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5731 LookupName(Previous, S); 5732 5733 // Warn about shadowing the name of a template parameter. 5734 if (Previous.isSingleResult() && 5735 Previous.getFoundDecl()->isTemplateParameter()) { 5736 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5737 Previous.getFoundDecl())) 5738 Invalid = true; 5739 Previous.clear(); 5740 } 5741 5742 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5743 "name in alias declaration must be an identifier"); 5744 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5745 Name.StartLocation, 5746 Name.Identifier, TInfo); 5747 5748 NewTD->setAccess(AS); 5749 5750 if (Invalid) 5751 NewTD->setInvalidDecl(); 5752 5753 CheckTypedefForVariablyModifiedType(S, NewTD); 5754 Invalid |= NewTD->isInvalidDecl(); 5755 5756 bool Redeclaration = false; 5757 5758 NamedDecl *NewND; 5759 if (TemplateParamLists.size()) { 5760 TypeAliasTemplateDecl *OldDecl = 0; 5761 TemplateParameterList *OldTemplateParams = 0; 5762 5763 if (TemplateParamLists.size() != 1) { 5764 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5765 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5766 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5767 } 5768 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5769 5770 // Only consider previous declarations in the same scope. 5771 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5772 /*ExplicitInstantiationOrSpecialization*/false); 5773 if (!Previous.empty()) { 5774 Redeclaration = true; 5775 5776 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5777 if (!OldDecl && !Invalid) { 5778 Diag(UsingLoc, diag::err_redefinition_different_kind) 5779 << Name.Identifier; 5780 5781 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5782 if (OldD->getLocation().isValid()) 5783 Diag(OldD->getLocation(), diag::note_previous_definition); 5784 5785 Invalid = true; 5786 } 5787 5788 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5789 if (TemplateParameterListsAreEqual(TemplateParams, 5790 OldDecl->getTemplateParameters(), 5791 /*Complain=*/true, 5792 TPL_TemplateMatch)) 5793 OldTemplateParams = OldDecl->getTemplateParameters(); 5794 else 5795 Invalid = true; 5796 5797 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5798 if (!Invalid && 5799 !Context.hasSameType(OldTD->getUnderlyingType(), 5800 NewTD->getUnderlyingType())) { 5801 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5802 // but we can't reasonably accept it. 5803 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5804 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5805 if (OldTD->getLocation().isValid()) 5806 Diag(OldTD->getLocation(), diag::note_previous_definition); 5807 Invalid = true; 5808 } 5809 } 5810 } 5811 5812 // Merge any previous default template arguments into our parameters, 5813 // and check the parameter list. 5814 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5815 TPC_TypeAliasTemplate)) 5816 return 0; 5817 5818 TypeAliasTemplateDecl *NewDecl = 5819 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5820 Name.Identifier, TemplateParams, 5821 NewTD); 5822 5823 NewDecl->setAccess(AS); 5824 5825 if (Invalid) 5826 NewDecl->setInvalidDecl(); 5827 else if (OldDecl) 5828 NewDecl->setPreviousDeclaration(OldDecl); 5829 5830 NewND = NewDecl; 5831 } else { 5832 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5833 NewND = NewTD; 5834 } 5835 5836 if (!Redeclaration) 5837 PushOnScopeChains(NewND, S); 5838 5839 return NewND; 5840} 5841 5842Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5843 SourceLocation NamespaceLoc, 5844 SourceLocation AliasLoc, 5845 IdentifierInfo *Alias, 5846 CXXScopeSpec &SS, 5847 SourceLocation IdentLoc, 5848 IdentifierInfo *Ident) { 5849 5850 // Lookup the namespace name. 5851 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5852 LookupParsedName(R, S, &SS); 5853 5854 // Check if we have a previous declaration with the same name. 5855 NamedDecl *PrevDecl 5856 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5857 ForRedeclaration); 5858 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5859 PrevDecl = 0; 5860 5861 if (PrevDecl) { 5862 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5863 // We already have an alias with the same name that points to the same 5864 // namespace, so don't create a new one. 5865 // FIXME: At some point, we'll want to create the (redundant) 5866 // declaration to maintain better source information. 5867 if (!R.isAmbiguous() && !R.empty() && 5868 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5869 return 0; 5870 } 5871 5872 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5873 diag::err_redefinition_different_kind; 5874 Diag(AliasLoc, DiagID) << Alias; 5875 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5876 return 0; 5877 } 5878 5879 if (R.isAmbiguous()) 5880 return 0; 5881 5882 if (R.empty()) { 5883 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 5884 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5885 return 0; 5886 } 5887 } 5888 5889 NamespaceAliasDecl *AliasDecl = 5890 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5891 Alias, SS.getWithLocInContext(Context), 5892 IdentLoc, R.getFoundDecl()); 5893 5894 PushOnScopeChains(AliasDecl, S); 5895 return AliasDecl; 5896} 5897 5898namespace { 5899 /// \brief Scoped object used to handle the state changes required in Sema 5900 /// to implicitly define the body of a C++ member function; 5901 class ImplicitlyDefinedFunctionScope { 5902 Sema &S; 5903 Sema::ContextRAII SavedContext; 5904 5905 public: 5906 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5907 : S(S), SavedContext(S, Method) 5908 { 5909 S.PushFunctionScope(); 5910 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5911 } 5912 5913 ~ImplicitlyDefinedFunctionScope() { 5914 S.PopExpressionEvaluationContext(); 5915 S.PopFunctionOrBlockScope(); 5916 } 5917 }; 5918} 5919 5920Sema::ImplicitExceptionSpecification 5921Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5922 // C++ [except.spec]p14: 5923 // An implicitly declared special member function (Clause 12) shall have an 5924 // exception-specification. [...] 5925 ImplicitExceptionSpecification ExceptSpec(Context); 5926 if (ClassDecl->isInvalidDecl()) 5927 return ExceptSpec; 5928 5929 // Direct base-class constructors. 5930 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5931 BEnd = ClassDecl->bases_end(); 5932 B != BEnd; ++B) { 5933 if (B->isVirtual()) // Handled below. 5934 continue; 5935 5936 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5937 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5938 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5939 // If this is a deleted function, add it anyway. This might be conformant 5940 // with the standard. This might not. I'm not sure. It might not matter. 5941 if (Constructor) 5942 ExceptSpec.CalledDecl(Constructor); 5943 } 5944 } 5945 5946 // Virtual base-class constructors. 5947 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5948 BEnd = ClassDecl->vbases_end(); 5949 B != BEnd; ++B) { 5950 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5951 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5952 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5953 // If this is a deleted function, add it anyway. This might be conformant 5954 // with the standard. This might not. I'm not sure. It might not matter. 5955 if (Constructor) 5956 ExceptSpec.CalledDecl(Constructor); 5957 } 5958 } 5959 5960 // Field constructors. 5961 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5962 FEnd = ClassDecl->field_end(); 5963 F != FEnd; ++F) { 5964 if (F->hasInClassInitializer()) { 5965 if (Expr *E = F->getInClassInitializer()) 5966 ExceptSpec.CalledExpr(E); 5967 else if (!F->isInvalidDecl()) 5968 ExceptSpec.SetDelayed(); 5969 } else if (const RecordType *RecordTy 5970 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5971 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5972 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5973 // If this is a deleted function, add it anyway. This might be conformant 5974 // with the standard. This might not. I'm not sure. It might not matter. 5975 // In particular, the problem is that this function never gets called. It 5976 // might just be ill-formed because this function attempts to refer to 5977 // a deleted function here. 5978 if (Constructor) 5979 ExceptSpec.CalledDecl(Constructor); 5980 } 5981 } 5982 5983 return ExceptSpec; 5984} 5985 5986CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5987 CXXRecordDecl *ClassDecl) { 5988 // C++ [class.ctor]p5: 5989 // A default constructor for a class X is a constructor of class X 5990 // that can be called without an argument. If there is no 5991 // user-declared constructor for class X, a default constructor is 5992 // implicitly declared. An implicitly-declared default constructor 5993 // is an inline public member of its class. 5994 assert(!ClassDecl->hasUserDeclaredConstructor() && 5995 "Should not build implicit default constructor!"); 5996 5997 ImplicitExceptionSpecification Spec = 5998 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5999 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6000 6001 // Create the actual constructor declaration. 6002 CanQualType ClassType 6003 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6004 SourceLocation ClassLoc = ClassDecl->getLocation(); 6005 DeclarationName Name 6006 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6007 DeclarationNameInfo NameInfo(Name, ClassLoc); 6008 CXXConstructorDecl *DefaultCon 6009 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6010 Context.getFunctionType(Context.VoidTy, 6011 0, 0, EPI), 6012 /*TInfo=*/0, 6013 /*isExplicit=*/false, 6014 /*isInline=*/true, 6015 /*isImplicitlyDeclared=*/true); 6016 DefaultCon->setAccess(AS_public); 6017 DefaultCon->setDefaulted(); 6018 DefaultCon->setImplicit(); 6019 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6020 6021 // Note that we have declared this constructor. 6022 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6023 6024 if (Scope *S = getScopeForContext(ClassDecl)) 6025 PushOnScopeChains(DefaultCon, S, false); 6026 ClassDecl->addDecl(DefaultCon); 6027 6028 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6029 DefaultCon->setDeletedAsWritten(); 6030 6031 return DefaultCon; 6032} 6033 6034void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6035 CXXConstructorDecl *Constructor) { 6036 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6037 !Constructor->doesThisDeclarationHaveABody() && 6038 !Constructor->isDeleted()) && 6039 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6040 6041 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6042 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6043 6044 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6045 DiagnosticErrorTrap Trap(Diags); 6046 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6047 Trap.hasErrorOccurred()) { 6048 Diag(CurrentLocation, diag::note_member_synthesized_at) 6049 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6050 Constructor->setInvalidDecl(); 6051 return; 6052 } 6053 6054 SourceLocation Loc = Constructor->getLocation(); 6055 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6056 6057 Constructor->setUsed(); 6058 MarkVTableUsed(CurrentLocation, ClassDecl); 6059 6060 if (ASTMutationListener *L = getASTMutationListener()) { 6061 L->CompletedImplicitDefinition(Constructor); 6062 } 6063} 6064 6065/// Get any existing defaulted default constructor for the given class. Do not 6066/// implicitly define one if it does not exist. 6067static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6068 CXXRecordDecl *D) { 6069 ASTContext &Context = Self.Context; 6070 QualType ClassType = Context.getTypeDeclType(D); 6071 DeclarationName ConstructorName 6072 = Context.DeclarationNames.getCXXConstructorName( 6073 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6074 6075 DeclContext::lookup_const_iterator Con, ConEnd; 6076 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6077 Con != ConEnd; ++Con) { 6078 // A function template cannot be defaulted. 6079 if (isa<FunctionTemplateDecl>(*Con)) 6080 continue; 6081 6082 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6083 if (Constructor->isDefaultConstructor()) 6084 return Constructor->isDefaulted() ? Constructor : 0; 6085 } 6086 return 0; 6087} 6088 6089void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6090 if (!D) return; 6091 AdjustDeclIfTemplate(D); 6092 6093 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6094 CXXConstructorDecl *CtorDecl 6095 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6096 6097 if (!CtorDecl) return; 6098 6099 // Compute the exception specification for the default constructor. 6100 const FunctionProtoType *CtorTy = 6101 CtorDecl->getType()->castAs<FunctionProtoType>(); 6102 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6103 ImplicitExceptionSpecification Spec = 6104 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6105 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6106 assert(EPI.ExceptionSpecType != EST_Delayed); 6107 6108 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6109 } 6110 6111 // If the default constructor is explicitly defaulted, checking the exception 6112 // specification is deferred until now. 6113 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6114 !ClassDecl->isDependentType()) 6115 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6116} 6117 6118void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6119 // We start with an initial pass over the base classes to collect those that 6120 // inherit constructors from. If there are none, we can forgo all further 6121 // processing. 6122 typedef SmallVector<const RecordType *, 4> BasesVector; 6123 BasesVector BasesToInheritFrom; 6124 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6125 BaseE = ClassDecl->bases_end(); 6126 BaseIt != BaseE; ++BaseIt) { 6127 if (BaseIt->getInheritConstructors()) { 6128 QualType Base = BaseIt->getType(); 6129 if (Base->isDependentType()) { 6130 // If we inherit constructors from anything that is dependent, just 6131 // abort processing altogether. We'll get another chance for the 6132 // instantiations. 6133 return; 6134 } 6135 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6136 } 6137 } 6138 if (BasesToInheritFrom.empty()) 6139 return; 6140 6141 // Now collect the constructors that we already have in the current class. 6142 // Those take precedence over inherited constructors. 6143 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6144 // unless there is a user-declared constructor with the same signature in 6145 // the class where the using-declaration appears. 6146 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6147 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6148 CtorE = ClassDecl->ctor_end(); 6149 CtorIt != CtorE; ++CtorIt) { 6150 ExistingConstructors.insert( 6151 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6152 } 6153 6154 Scope *S = getScopeForContext(ClassDecl); 6155 DeclarationName CreatedCtorName = 6156 Context.DeclarationNames.getCXXConstructorName( 6157 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6158 6159 // Now comes the true work. 6160 // First, we keep a map from constructor types to the base that introduced 6161 // them. Needed for finding conflicting constructors. We also keep the 6162 // actually inserted declarations in there, for pretty diagnostics. 6163 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6164 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6165 ConstructorToSourceMap InheritedConstructors; 6166 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6167 BaseE = BasesToInheritFrom.end(); 6168 BaseIt != BaseE; ++BaseIt) { 6169 const RecordType *Base = *BaseIt; 6170 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6171 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6172 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6173 CtorE = BaseDecl->ctor_end(); 6174 CtorIt != CtorE; ++CtorIt) { 6175 // Find the using declaration for inheriting this base's constructors. 6176 DeclarationName Name = 6177 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6178 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6179 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6180 SourceLocation UsingLoc = UD ? UD->getLocation() : 6181 ClassDecl->getLocation(); 6182 6183 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6184 // from the class X named in the using-declaration consists of actual 6185 // constructors and notional constructors that result from the 6186 // transformation of defaulted parameters as follows: 6187 // - all non-template default constructors of X, and 6188 // - for each non-template constructor of X that has at least one 6189 // parameter with a default argument, the set of constructors that 6190 // results from omitting any ellipsis parameter specification and 6191 // successively omitting parameters with a default argument from the 6192 // end of the parameter-type-list. 6193 CXXConstructorDecl *BaseCtor = *CtorIt; 6194 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6195 const FunctionProtoType *BaseCtorType = 6196 BaseCtor->getType()->getAs<FunctionProtoType>(); 6197 6198 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6199 maxParams = BaseCtor->getNumParams(); 6200 params <= maxParams; ++params) { 6201 // Skip default constructors. They're never inherited. 6202 if (params == 0) 6203 continue; 6204 // Skip copy and move constructors for the same reason. 6205 if (CanBeCopyOrMove && params == 1) 6206 continue; 6207 6208 // Build up a function type for this particular constructor. 6209 // FIXME: The working paper does not consider that the exception spec 6210 // for the inheriting constructor might be larger than that of the 6211 // source. This code doesn't yet, either. When it does, this code will 6212 // need to be delayed until after exception specifications and in-class 6213 // member initializers are attached. 6214 const Type *NewCtorType; 6215 if (params == maxParams) 6216 NewCtorType = BaseCtorType; 6217 else { 6218 SmallVector<QualType, 16> Args; 6219 for (unsigned i = 0; i < params; ++i) { 6220 Args.push_back(BaseCtorType->getArgType(i)); 6221 } 6222 FunctionProtoType::ExtProtoInfo ExtInfo = 6223 BaseCtorType->getExtProtoInfo(); 6224 ExtInfo.Variadic = false; 6225 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6226 Args.data(), params, ExtInfo) 6227 .getTypePtr(); 6228 } 6229 const Type *CanonicalNewCtorType = 6230 Context.getCanonicalType(NewCtorType); 6231 6232 // Now that we have the type, first check if the class already has a 6233 // constructor with this signature. 6234 if (ExistingConstructors.count(CanonicalNewCtorType)) 6235 continue; 6236 6237 // Then we check if we have already declared an inherited constructor 6238 // with this signature. 6239 std::pair<ConstructorToSourceMap::iterator, bool> result = 6240 InheritedConstructors.insert(std::make_pair( 6241 CanonicalNewCtorType, 6242 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6243 if (!result.second) { 6244 // Already in the map. If it came from a different class, that's an 6245 // error. Not if it's from the same. 6246 CanQualType PreviousBase = result.first->second.first; 6247 if (CanonicalBase != PreviousBase) { 6248 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6249 const CXXConstructorDecl *PrevBaseCtor = 6250 PrevCtor->getInheritedConstructor(); 6251 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6252 6253 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6254 Diag(BaseCtor->getLocation(), 6255 diag::note_using_decl_constructor_conflict_current_ctor); 6256 Diag(PrevBaseCtor->getLocation(), 6257 diag::note_using_decl_constructor_conflict_previous_ctor); 6258 Diag(PrevCtor->getLocation(), 6259 diag::note_using_decl_constructor_conflict_previous_using); 6260 } 6261 continue; 6262 } 6263 6264 // OK, we're there, now add the constructor. 6265 // C++0x [class.inhctor]p8: [...] that would be performed by a 6266 // user-writtern inline constructor [...] 6267 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6268 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6269 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6270 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6271 /*ImplicitlyDeclared=*/true); 6272 NewCtor->setAccess(BaseCtor->getAccess()); 6273 6274 // Build up the parameter decls and add them. 6275 SmallVector<ParmVarDecl *, 16> ParamDecls; 6276 for (unsigned i = 0; i < params; ++i) { 6277 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6278 UsingLoc, UsingLoc, 6279 /*IdentifierInfo=*/0, 6280 BaseCtorType->getArgType(i), 6281 /*TInfo=*/0, SC_None, 6282 SC_None, /*DefaultArg=*/0)); 6283 } 6284 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6285 NewCtor->setInheritedConstructor(BaseCtor); 6286 6287 PushOnScopeChains(NewCtor, S, false); 6288 ClassDecl->addDecl(NewCtor); 6289 result.first->second.second = NewCtor; 6290 } 6291 } 6292 } 6293} 6294 6295Sema::ImplicitExceptionSpecification 6296Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6297 // C++ [except.spec]p14: 6298 // An implicitly declared special member function (Clause 12) shall have 6299 // an exception-specification. 6300 ImplicitExceptionSpecification ExceptSpec(Context); 6301 if (ClassDecl->isInvalidDecl()) 6302 return ExceptSpec; 6303 6304 // Direct base-class destructors. 6305 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6306 BEnd = ClassDecl->bases_end(); 6307 B != BEnd; ++B) { 6308 if (B->isVirtual()) // Handled below. 6309 continue; 6310 6311 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6312 ExceptSpec.CalledDecl( 6313 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6314 } 6315 6316 // Virtual base-class destructors. 6317 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6318 BEnd = ClassDecl->vbases_end(); 6319 B != BEnd; ++B) { 6320 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6321 ExceptSpec.CalledDecl( 6322 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6323 } 6324 6325 // Field destructors. 6326 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6327 FEnd = ClassDecl->field_end(); 6328 F != FEnd; ++F) { 6329 if (const RecordType *RecordTy 6330 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6331 ExceptSpec.CalledDecl( 6332 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6333 } 6334 6335 return ExceptSpec; 6336} 6337 6338CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6339 // C++ [class.dtor]p2: 6340 // If a class has no user-declared destructor, a destructor is 6341 // declared implicitly. An implicitly-declared destructor is an 6342 // inline public member of its class. 6343 6344 ImplicitExceptionSpecification Spec = 6345 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6346 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6347 6348 // Create the actual destructor declaration. 6349 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6350 6351 CanQualType ClassType 6352 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6353 SourceLocation ClassLoc = ClassDecl->getLocation(); 6354 DeclarationName Name 6355 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6356 DeclarationNameInfo NameInfo(Name, ClassLoc); 6357 CXXDestructorDecl *Destructor 6358 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6359 /*isInline=*/true, 6360 /*isImplicitlyDeclared=*/true); 6361 Destructor->setAccess(AS_public); 6362 Destructor->setDefaulted(); 6363 Destructor->setImplicit(); 6364 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6365 6366 // Note that we have declared this destructor. 6367 ++ASTContext::NumImplicitDestructorsDeclared; 6368 6369 // Introduce this destructor into its scope. 6370 if (Scope *S = getScopeForContext(ClassDecl)) 6371 PushOnScopeChains(Destructor, S, false); 6372 ClassDecl->addDecl(Destructor); 6373 6374 // This could be uniqued if it ever proves significant. 6375 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6376 6377 if (ShouldDeleteDestructor(Destructor)) 6378 Destructor->setDeletedAsWritten(); 6379 6380 AddOverriddenMethods(ClassDecl, Destructor); 6381 6382 return Destructor; 6383} 6384 6385void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6386 CXXDestructorDecl *Destructor) { 6387 assert((Destructor->isDefaulted() && 6388 !Destructor->doesThisDeclarationHaveABody()) && 6389 "DefineImplicitDestructor - call it for implicit default dtor"); 6390 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6391 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6392 6393 if (Destructor->isInvalidDecl()) 6394 return; 6395 6396 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6397 6398 DiagnosticErrorTrap Trap(Diags); 6399 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6400 Destructor->getParent()); 6401 6402 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6403 Diag(CurrentLocation, diag::note_member_synthesized_at) 6404 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6405 6406 Destructor->setInvalidDecl(); 6407 return; 6408 } 6409 6410 SourceLocation Loc = Destructor->getLocation(); 6411 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6412 6413 Destructor->setUsed(); 6414 MarkVTableUsed(CurrentLocation, ClassDecl); 6415 6416 if (ASTMutationListener *L = getASTMutationListener()) { 6417 L->CompletedImplicitDefinition(Destructor); 6418 } 6419} 6420 6421void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6422 CXXDestructorDecl *destructor) { 6423 // C++11 [class.dtor]p3: 6424 // A declaration of a destructor that does not have an exception- 6425 // specification is implicitly considered to have the same exception- 6426 // specification as an implicit declaration. 6427 const FunctionProtoType *dtorType = destructor->getType()-> 6428 getAs<FunctionProtoType>(); 6429 if (dtorType->hasExceptionSpec()) 6430 return; 6431 6432 ImplicitExceptionSpecification exceptSpec = 6433 ComputeDefaultedDtorExceptionSpec(classDecl); 6434 6435 // Replace the destructor's type. 6436 FunctionProtoType::ExtProtoInfo epi; 6437 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6438 epi.NumExceptions = exceptSpec.size(); 6439 epi.Exceptions = exceptSpec.data(); 6440 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6441 6442 destructor->setType(ty); 6443 6444 // FIXME: If the destructor has a body that could throw, and the newly created 6445 // spec doesn't allow exceptions, we should emit a warning, because this 6446 // change in behavior can break conforming C++03 programs at runtime. 6447 // However, we don't have a body yet, so it needs to be done somewhere else. 6448} 6449 6450/// \brief Builds a statement that copies the given entity from \p From to 6451/// \c To. 6452/// 6453/// This routine is used to copy the members of a class with an 6454/// implicitly-declared copy assignment operator. When the entities being 6455/// copied are arrays, this routine builds for loops to copy them. 6456/// 6457/// \param S The Sema object used for type-checking. 6458/// 6459/// \param Loc The location where the implicit copy is being generated. 6460/// 6461/// \param T The type of the expressions being copied. Both expressions must 6462/// have this type. 6463/// 6464/// \param To The expression we are copying to. 6465/// 6466/// \param From The expression we are copying from. 6467/// 6468/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6469/// Otherwise, it's a non-static member subobject. 6470/// 6471/// \param Depth Internal parameter recording the depth of the recursion. 6472/// 6473/// \returns A statement or a loop that copies the expressions. 6474static StmtResult 6475BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6476 Expr *To, Expr *From, 6477 bool CopyingBaseSubobject, unsigned Depth = 0) { 6478 // C++0x [class.copy]p30: 6479 // Each subobject is assigned in the manner appropriate to its type: 6480 // 6481 // - if the subobject is of class type, the copy assignment operator 6482 // for the class is used (as if by explicit qualification; that is, 6483 // ignoring any possible virtual overriding functions in more derived 6484 // classes); 6485 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6486 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6487 6488 // Look for operator=. 6489 DeclarationName Name 6490 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6491 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6492 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6493 6494 // Filter out any result that isn't a copy-assignment operator. 6495 LookupResult::Filter F = OpLookup.makeFilter(); 6496 while (F.hasNext()) { 6497 NamedDecl *D = F.next(); 6498 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6499 if (Method->isCopyAssignmentOperator()) 6500 continue; 6501 6502 F.erase(); 6503 } 6504 F.done(); 6505 6506 // Suppress the protected check (C++ [class.protected]) for each of the 6507 // assignment operators we found. This strange dance is required when 6508 // we're assigning via a base classes's copy-assignment operator. To 6509 // ensure that we're getting the right base class subobject (without 6510 // ambiguities), we need to cast "this" to that subobject type; to 6511 // ensure that we don't go through the virtual call mechanism, we need 6512 // to qualify the operator= name with the base class (see below). However, 6513 // this means that if the base class has a protected copy assignment 6514 // operator, the protected member access check will fail. So, we 6515 // rewrite "protected" access to "public" access in this case, since we 6516 // know by construction that we're calling from a derived class. 6517 if (CopyingBaseSubobject) { 6518 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6519 L != LEnd; ++L) { 6520 if (L.getAccess() == AS_protected) 6521 L.setAccess(AS_public); 6522 } 6523 } 6524 6525 // Create the nested-name-specifier that will be used to qualify the 6526 // reference to operator=; this is required to suppress the virtual 6527 // call mechanism. 6528 CXXScopeSpec SS; 6529 SS.MakeTrivial(S.Context, 6530 NestedNameSpecifier::Create(S.Context, 0, false, 6531 T.getTypePtr()), 6532 Loc); 6533 6534 // Create the reference to operator=. 6535 ExprResult OpEqualRef 6536 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6537 /*FirstQualifierInScope=*/0, OpLookup, 6538 /*TemplateArgs=*/0, 6539 /*SuppressQualifierCheck=*/true); 6540 if (OpEqualRef.isInvalid()) 6541 return StmtError(); 6542 6543 // Build the call to the assignment operator. 6544 6545 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6546 OpEqualRef.takeAs<Expr>(), 6547 Loc, &From, 1, Loc); 6548 if (Call.isInvalid()) 6549 return StmtError(); 6550 6551 return S.Owned(Call.takeAs<Stmt>()); 6552 } 6553 6554 // - if the subobject is of scalar type, the built-in assignment 6555 // operator is used. 6556 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6557 if (!ArrayTy) { 6558 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6559 if (Assignment.isInvalid()) 6560 return StmtError(); 6561 6562 return S.Owned(Assignment.takeAs<Stmt>()); 6563 } 6564 6565 // - if the subobject is an array, each element is assigned, in the 6566 // manner appropriate to the element type; 6567 6568 // Construct a loop over the array bounds, e.g., 6569 // 6570 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6571 // 6572 // that will copy each of the array elements. 6573 QualType SizeType = S.Context.getSizeType(); 6574 6575 // Create the iteration variable. 6576 IdentifierInfo *IterationVarName = 0; 6577 { 6578 llvm::SmallString<8> Str; 6579 llvm::raw_svector_ostream OS(Str); 6580 OS << "__i" << Depth; 6581 IterationVarName = &S.Context.Idents.get(OS.str()); 6582 } 6583 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6584 IterationVarName, SizeType, 6585 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6586 SC_None, SC_None); 6587 6588 // Initialize the iteration variable to zero. 6589 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6590 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6591 6592 // Create a reference to the iteration variable; we'll use this several 6593 // times throughout. 6594 Expr *IterationVarRef 6595 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6596 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6597 6598 // Create the DeclStmt that holds the iteration variable. 6599 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6600 6601 // Create the comparison against the array bound. 6602 llvm::APInt Upper 6603 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6604 Expr *Comparison 6605 = new (S.Context) BinaryOperator(IterationVarRef, 6606 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6607 BO_NE, S.Context.BoolTy, 6608 VK_RValue, OK_Ordinary, Loc); 6609 6610 // Create the pre-increment of the iteration variable. 6611 Expr *Increment 6612 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6613 VK_LValue, OK_Ordinary, Loc); 6614 6615 // Subscript the "from" and "to" expressions with the iteration variable. 6616 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6617 IterationVarRef, Loc)); 6618 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6619 IterationVarRef, Loc)); 6620 6621 // Build the copy for an individual element of the array. 6622 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6623 To, From, CopyingBaseSubobject, 6624 Depth + 1); 6625 if (Copy.isInvalid()) 6626 return StmtError(); 6627 6628 // Construct the loop that copies all elements of this array. 6629 return S.ActOnForStmt(Loc, Loc, InitStmt, 6630 S.MakeFullExpr(Comparison), 6631 0, S.MakeFullExpr(Increment), 6632 Loc, Copy.take()); 6633} 6634 6635std::pair<Sema::ImplicitExceptionSpecification, bool> 6636Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6637 CXXRecordDecl *ClassDecl) { 6638 if (ClassDecl->isInvalidDecl()) 6639 return std::make_pair(ImplicitExceptionSpecification(Context), false); 6640 6641 // C++ [class.copy]p10: 6642 // If the class definition does not explicitly declare a copy 6643 // assignment operator, one is declared implicitly. 6644 // The implicitly-defined copy assignment operator for a class X 6645 // will have the form 6646 // 6647 // X& X::operator=(const X&) 6648 // 6649 // if 6650 bool HasConstCopyAssignment = true; 6651 6652 // -- each direct base class B of X has a copy assignment operator 6653 // whose parameter is of type const B&, const volatile B& or B, 6654 // and 6655 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6656 BaseEnd = ClassDecl->bases_end(); 6657 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6658 // We'll handle this below 6659 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 6660 continue; 6661 6662 assert(!Base->getType()->isDependentType() && 6663 "Cannot generate implicit members for class with dependent bases."); 6664 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6665 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6666 &HasConstCopyAssignment); 6667 } 6668 6669 // In C++0x, the above citation has "or virtual added" 6670 if (LangOpts.CPlusPlus0x) { 6671 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6672 BaseEnd = ClassDecl->vbases_end(); 6673 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6674 assert(!Base->getType()->isDependentType() && 6675 "Cannot generate implicit members for class with dependent bases."); 6676 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6677 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6678 &HasConstCopyAssignment); 6679 } 6680 } 6681 6682 // -- for all the nonstatic data members of X that are of a class 6683 // type M (or array thereof), each such class type has a copy 6684 // assignment operator whose parameter is of type const M&, 6685 // const volatile M& or M. 6686 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6687 FieldEnd = ClassDecl->field_end(); 6688 HasConstCopyAssignment && Field != FieldEnd; 6689 ++Field) { 6690 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6691 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6692 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 6693 &HasConstCopyAssignment); 6694 } 6695 } 6696 6697 // Otherwise, the implicitly declared copy assignment operator will 6698 // have the form 6699 // 6700 // X& X::operator=(X&) 6701 6702 // C++ [except.spec]p14: 6703 // An implicitly declared special member function (Clause 12) shall have an 6704 // exception-specification. [...] 6705 6706 // It is unspecified whether or not an implicit copy assignment operator 6707 // attempts to deduplicate calls to assignment operators of virtual bases are 6708 // made. As such, this exception specification is effectively unspecified. 6709 // Based on a similar decision made for constness in C++0x, we're erring on 6710 // the side of assuming such calls to be made regardless of whether they 6711 // actually happen. 6712 ImplicitExceptionSpecification ExceptSpec(Context); 6713 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 6714 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6715 BaseEnd = ClassDecl->bases_end(); 6716 Base != BaseEnd; ++Base) { 6717 if (Base->isVirtual()) 6718 continue; 6719 6720 CXXRecordDecl *BaseClassDecl 6721 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6722 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6723 ArgQuals, false, 0)) 6724 ExceptSpec.CalledDecl(CopyAssign); 6725 } 6726 6727 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6728 BaseEnd = ClassDecl->vbases_end(); 6729 Base != BaseEnd; ++Base) { 6730 CXXRecordDecl *BaseClassDecl 6731 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6732 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6733 ArgQuals, false, 0)) 6734 ExceptSpec.CalledDecl(CopyAssign); 6735 } 6736 6737 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6738 FieldEnd = ClassDecl->field_end(); 6739 Field != FieldEnd; 6740 ++Field) { 6741 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6742 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6743 if (CXXMethodDecl *CopyAssign = 6744 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 6745 ExceptSpec.CalledDecl(CopyAssign); 6746 } 6747 } 6748 6749 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6750} 6751 6752CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6753 // Note: The following rules are largely analoguous to the copy 6754 // constructor rules. Note that virtual bases are not taken into account 6755 // for determining the argument type of the operator. Note also that 6756 // operators taking an object instead of a reference are allowed. 6757 6758 ImplicitExceptionSpecification Spec(Context); 6759 bool Const; 6760 llvm::tie(Spec, Const) = 6761 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6762 6763 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6764 QualType RetType = Context.getLValueReferenceType(ArgType); 6765 if (Const) 6766 ArgType = ArgType.withConst(); 6767 ArgType = Context.getLValueReferenceType(ArgType); 6768 6769 // An implicitly-declared copy assignment operator is an inline public 6770 // member of its class. 6771 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6772 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6773 SourceLocation ClassLoc = ClassDecl->getLocation(); 6774 DeclarationNameInfo NameInfo(Name, ClassLoc); 6775 CXXMethodDecl *CopyAssignment 6776 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6777 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6778 /*TInfo=*/0, /*isStatic=*/false, 6779 /*StorageClassAsWritten=*/SC_None, 6780 /*isInline=*/true, 6781 SourceLocation()); 6782 CopyAssignment->setAccess(AS_public); 6783 CopyAssignment->setDefaulted(); 6784 CopyAssignment->setImplicit(); 6785 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6786 6787 // Add the parameter to the operator. 6788 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6789 ClassLoc, ClassLoc, /*Id=*/0, 6790 ArgType, /*TInfo=*/0, 6791 SC_None, 6792 SC_None, 0); 6793 CopyAssignment->setParams(&FromParam, 1); 6794 6795 // Note that we have added this copy-assignment operator. 6796 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6797 6798 if (Scope *S = getScopeForContext(ClassDecl)) 6799 PushOnScopeChains(CopyAssignment, S, false); 6800 ClassDecl->addDecl(CopyAssignment); 6801 6802 // C++0x [class.copy]p18: 6803 // ... If the class definition declares a move constructor or move 6804 // assignment operator, the implicitly declared copy assignment operator is 6805 // defined as deleted; ... 6806 if (ClassDecl->hasUserDeclaredMoveConstructor() || 6807 ClassDecl->hasUserDeclaredMoveAssignment() || 6808 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6809 CopyAssignment->setDeletedAsWritten(); 6810 6811 AddOverriddenMethods(ClassDecl, CopyAssignment); 6812 return CopyAssignment; 6813} 6814 6815void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6816 CXXMethodDecl *CopyAssignOperator) { 6817 assert((CopyAssignOperator->isDefaulted() && 6818 CopyAssignOperator->isOverloadedOperator() && 6819 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6820 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6821 "DefineImplicitCopyAssignment called for wrong function"); 6822 6823 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6824 6825 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6826 CopyAssignOperator->setInvalidDecl(); 6827 return; 6828 } 6829 6830 CopyAssignOperator->setUsed(); 6831 6832 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6833 DiagnosticErrorTrap Trap(Diags); 6834 6835 // C++0x [class.copy]p30: 6836 // The implicitly-defined or explicitly-defaulted copy assignment operator 6837 // for a non-union class X performs memberwise copy assignment of its 6838 // subobjects. The direct base classes of X are assigned first, in the 6839 // order of their declaration in the base-specifier-list, and then the 6840 // immediate non-static data members of X are assigned, in the order in 6841 // which they were declared in the class definition. 6842 6843 // The statements that form the synthesized function body. 6844 ASTOwningVector<Stmt*> Statements(*this); 6845 6846 // The parameter for the "other" object, which we are copying from. 6847 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6848 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6849 QualType OtherRefType = Other->getType(); 6850 if (const LValueReferenceType *OtherRef 6851 = OtherRefType->getAs<LValueReferenceType>()) { 6852 OtherRefType = OtherRef->getPointeeType(); 6853 OtherQuals = OtherRefType.getQualifiers(); 6854 } 6855 6856 // Our location for everything implicitly-generated. 6857 SourceLocation Loc = CopyAssignOperator->getLocation(); 6858 6859 // Construct a reference to the "other" object. We'll be using this 6860 // throughout the generated ASTs. 6861 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6862 assert(OtherRef && "Reference to parameter cannot fail!"); 6863 6864 // Construct the "this" pointer. We'll be using this throughout the generated 6865 // ASTs. 6866 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6867 assert(This && "Reference to this cannot fail!"); 6868 6869 // Assign base classes. 6870 bool Invalid = false; 6871 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6872 E = ClassDecl->bases_end(); Base != E; ++Base) { 6873 // Form the assignment: 6874 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6875 QualType BaseType = Base->getType().getUnqualifiedType(); 6876 if (!BaseType->isRecordType()) { 6877 Invalid = true; 6878 continue; 6879 } 6880 6881 CXXCastPath BasePath; 6882 BasePath.push_back(Base); 6883 6884 // Construct the "from" expression, which is an implicit cast to the 6885 // appropriately-qualified base type. 6886 Expr *From = OtherRef; 6887 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6888 CK_UncheckedDerivedToBase, 6889 VK_LValue, &BasePath).take(); 6890 6891 // Dereference "this". 6892 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6893 6894 // Implicitly cast "this" to the appropriately-qualified base type. 6895 To = ImpCastExprToType(To.take(), 6896 Context.getCVRQualifiedType(BaseType, 6897 CopyAssignOperator->getTypeQualifiers()), 6898 CK_UncheckedDerivedToBase, 6899 VK_LValue, &BasePath); 6900 6901 // Build the copy. 6902 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6903 To.get(), From, 6904 /*CopyingBaseSubobject=*/true); 6905 if (Copy.isInvalid()) { 6906 Diag(CurrentLocation, diag::note_member_synthesized_at) 6907 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6908 CopyAssignOperator->setInvalidDecl(); 6909 return; 6910 } 6911 6912 // Success! Record the copy. 6913 Statements.push_back(Copy.takeAs<Expr>()); 6914 } 6915 6916 // \brief Reference to the __builtin_memcpy function. 6917 Expr *BuiltinMemCpyRef = 0; 6918 // \brief Reference to the __builtin_objc_memmove_collectable function. 6919 Expr *CollectableMemCpyRef = 0; 6920 6921 // Assign non-static members. 6922 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6923 FieldEnd = ClassDecl->field_end(); 6924 Field != FieldEnd; ++Field) { 6925 // Check for members of reference type; we can't copy those. 6926 if (Field->getType()->isReferenceType()) { 6927 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6928 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6929 Diag(Field->getLocation(), diag::note_declared_at); 6930 Diag(CurrentLocation, diag::note_member_synthesized_at) 6931 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6932 Invalid = true; 6933 continue; 6934 } 6935 6936 // Check for members of const-qualified, non-class type. 6937 QualType BaseType = Context.getBaseElementType(Field->getType()); 6938 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6939 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6940 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6941 Diag(Field->getLocation(), diag::note_declared_at); 6942 Diag(CurrentLocation, diag::note_member_synthesized_at) 6943 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6944 Invalid = true; 6945 continue; 6946 } 6947 6948 // Suppress assigning zero-width bitfields. 6949 if (const Expr *Width = Field->getBitWidth()) 6950 if (Width->EvaluateAsInt(Context) == 0) 6951 continue; 6952 6953 QualType FieldType = Field->getType().getNonReferenceType(); 6954 if (FieldType->isIncompleteArrayType()) { 6955 assert(ClassDecl->hasFlexibleArrayMember() && 6956 "Incomplete array type is not valid"); 6957 continue; 6958 } 6959 6960 // Build references to the field in the object we're copying from and to. 6961 CXXScopeSpec SS; // Intentionally empty 6962 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6963 LookupMemberName); 6964 MemberLookup.addDecl(*Field); 6965 MemberLookup.resolveKind(); 6966 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6967 Loc, /*IsArrow=*/false, 6968 SS, 0, MemberLookup, 0); 6969 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6970 Loc, /*IsArrow=*/true, 6971 SS, 0, MemberLookup, 0); 6972 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6973 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6974 6975 // If the field should be copied with __builtin_memcpy rather than via 6976 // explicit assignments, do so. This optimization only applies for arrays 6977 // of scalars and arrays of class type with trivial copy-assignment 6978 // operators. 6979 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 6980 && BaseType.hasTrivialCopyAssignment(Context)) { 6981 // Compute the size of the memory buffer to be copied. 6982 QualType SizeType = Context.getSizeType(); 6983 llvm::APInt Size(Context.getTypeSize(SizeType), 6984 Context.getTypeSizeInChars(BaseType).getQuantity()); 6985 for (const ConstantArrayType *Array 6986 = Context.getAsConstantArrayType(FieldType); 6987 Array; 6988 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6989 llvm::APInt ArraySize 6990 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6991 Size *= ArraySize; 6992 } 6993 6994 // Take the address of the field references for "from" and "to". 6995 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6996 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6997 6998 bool NeedsCollectableMemCpy = 6999 (BaseType->isRecordType() && 7000 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7001 7002 if (NeedsCollectableMemCpy) { 7003 if (!CollectableMemCpyRef) { 7004 // Create a reference to the __builtin_objc_memmove_collectable function. 7005 LookupResult R(*this, 7006 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7007 Loc, LookupOrdinaryName); 7008 LookupName(R, TUScope, true); 7009 7010 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7011 if (!CollectableMemCpy) { 7012 // Something went horribly wrong earlier, and we will have 7013 // complained about it. 7014 Invalid = true; 7015 continue; 7016 } 7017 7018 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7019 CollectableMemCpy->getType(), 7020 VK_LValue, Loc, 0).take(); 7021 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7022 } 7023 } 7024 // Create a reference to the __builtin_memcpy builtin function. 7025 else if (!BuiltinMemCpyRef) { 7026 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7027 LookupOrdinaryName); 7028 LookupName(R, TUScope, true); 7029 7030 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7031 if (!BuiltinMemCpy) { 7032 // Something went horribly wrong earlier, and we will have complained 7033 // about it. 7034 Invalid = true; 7035 continue; 7036 } 7037 7038 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7039 BuiltinMemCpy->getType(), 7040 VK_LValue, Loc, 0).take(); 7041 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7042 } 7043 7044 ASTOwningVector<Expr*> CallArgs(*this); 7045 CallArgs.push_back(To.takeAs<Expr>()); 7046 CallArgs.push_back(From.takeAs<Expr>()); 7047 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7048 ExprResult Call = ExprError(); 7049 if (NeedsCollectableMemCpy) 7050 Call = ActOnCallExpr(/*Scope=*/0, 7051 CollectableMemCpyRef, 7052 Loc, move_arg(CallArgs), 7053 Loc); 7054 else 7055 Call = ActOnCallExpr(/*Scope=*/0, 7056 BuiltinMemCpyRef, 7057 Loc, move_arg(CallArgs), 7058 Loc); 7059 7060 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7061 Statements.push_back(Call.takeAs<Expr>()); 7062 continue; 7063 } 7064 7065 // Build the copy of this field. 7066 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7067 To.get(), From.get(), 7068 /*CopyingBaseSubobject=*/false); 7069 if (Copy.isInvalid()) { 7070 Diag(CurrentLocation, diag::note_member_synthesized_at) 7071 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7072 CopyAssignOperator->setInvalidDecl(); 7073 return; 7074 } 7075 7076 // Success! Record the copy. 7077 Statements.push_back(Copy.takeAs<Stmt>()); 7078 } 7079 7080 if (!Invalid) { 7081 // Add a "return *this;" 7082 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7083 7084 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7085 if (Return.isInvalid()) 7086 Invalid = true; 7087 else { 7088 Statements.push_back(Return.takeAs<Stmt>()); 7089 7090 if (Trap.hasErrorOccurred()) { 7091 Diag(CurrentLocation, diag::note_member_synthesized_at) 7092 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7093 Invalid = true; 7094 } 7095 } 7096 } 7097 7098 if (Invalid) { 7099 CopyAssignOperator->setInvalidDecl(); 7100 return; 7101 } 7102 7103 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7104 /*isStmtExpr=*/false); 7105 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7106 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7107 7108 if (ASTMutationListener *L = getASTMutationListener()) { 7109 L->CompletedImplicitDefinition(CopyAssignOperator); 7110 } 7111} 7112 7113std::pair<Sema::ImplicitExceptionSpecification, bool> 7114Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7115 if (ClassDecl->isInvalidDecl()) 7116 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7117 7118 // C++ [class.copy]p5: 7119 // The implicitly-declared copy constructor for a class X will 7120 // have the form 7121 // 7122 // X::X(const X&) 7123 // 7124 // if 7125 // FIXME: It ought to be possible to store this on the record. 7126 bool HasConstCopyConstructor = true; 7127 7128 // -- each direct or virtual base class B of X has a copy 7129 // constructor whose first parameter is of type const B& or 7130 // const volatile B&, and 7131 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7132 BaseEnd = ClassDecl->bases_end(); 7133 HasConstCopyConstructor && Base != BaseEnd; 7134 ++Base) { 7135 // Virtual bases are handled below. 7136 if (Base->isVirtual()) 7137 continue; 7138 7139 CXXRecordDecl *BaseClassDecl 7140 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7141 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7142 &HasConstCopyConstructor); 7143 } 7144 7145 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7146 BaseEnd = ClassDecl->vbases_end(); 7147 HasConstCopyConstructor && Base != BaseEnd; 7148 ++Base) { 7149 CXXRecordDecl *BaseClassDecl 7150 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7151 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7152 &HasConstCopyConstructor); 7153 } 7154 7155 // -- for all the nonstatic data members of X that are of a 7156 // class type M (or array thereof), each such class type 7157 // has a copy constructor whose first parameter is of type 7158 // const M& or const volatile M&. 7159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7160 FieldEnd = ClassDecl->field_end(); 7161 HasConstCopyConstructor && Field != FieldEnd; 7162 ++Field) { 7163 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7165 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 7166 &HasConstCopyConstructor); 7167 } 7168 } 7169 // Otherwise, the implicitly declared copy constructor will have 7170 // the form 7171 // 7172 // X::X(X&) 7173 7174 // C++ [except.spec]p14: 7175 // An implicitly declared special member function (Clause 12) shall have an 7176 // exception-specification. [...] 7177 ImplicitExceptionSpecification ExceptSpec(Context); 7178 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7179 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7180 BaseEnd = ClassDecl->bases_end(); 7181 Base != BaseEnd; 7182 ++Base) { 7183 // Virtual bases are handled below. 7184 if (Base->isVirtual()) 7185 continue; 7186 7187 CXXRecordDecl *BaseClassDecl 7188 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7189 if (CXXConstructorDecl *CopyConstructor = 7190 LookupCopyingConstructor(BaseClassDecl, Quals)) 7191 ExceptSpec.CalledDecl(CopyConstructor); 7192 } 7193 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7194 BaseEnd = ClassDecl->vbases_end(); 7195 Base != BaseEnd; 7196 ++Base) { 7197 CXXRecordDecl *BaseClassDecl 7198 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7199 if (CXXConstructorDecl *CopyConstructor = 7200 LookupCopyingConstructor(BaseClassDecl, Quals)) 7201 ExceptSpec.CalledDecl(CopyConstructor); 7202 } 7203 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7204 FieldEnd = ClassDecl->field_end(); 7205 Field != FieldEnd; 7206 ++Field) { 7207 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7208 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7209 if (CXXConstructorDecl *CopyConstructor = 7210 LookupCopyingConstructor(FieldClassDecl, Quals)) 7211 ExceptSpec.CalledDecl(CopyConstructor); 7212 } 7213 } 7214 7215 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7216} 7217 7218CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7219 CXXRecordDecl *ClassDecl) { 7220 // C++ [class.copy]p4: 7221 // If the class definition does not explicitly declare a copy 7222 // constructor, one is declared implicitly. 7223 7224 ImplicitExceptionSpecification Spec(Context); 7225 bool Const; 7226 llvm::tie(Spec, Const) = 7227 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7228 7229 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7230 QualType ArgType = ClassType; 7231 if (Const) 7232 ArgType = ArgType.withConst(); 7233 ArgType = Context.getLValueReferenceType(ArgType); 7234 7235 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7236 7237 DeclarationName Name 7238 = Context.DeclarationNames.getCXXConstructorName( 7239 Context.getCanonicalType(ClassType)); 7240 SourceLocation ClassLoc = ClassDecl->getLocation(); 7241 DeclarationNameInfo NameInfo(Name, ClassLoc); 7242 7243 // An implicitly-declared copy constructor is an inline public 7244 // member of its class. 7245 CXXConstructorDecl *CopyConstructor 7246 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7247 Context.getFunctionType(Context.VoidTy, 7248 &ArgType, 1, EPI), 7249 /*TInfo=*/0, 7250 /*isExplicit=*/false, 7251 /*isInline=*/true, 7252 /*isImplicitlyDeclared=*/true); 7253 CopyConstructor->setAccess(AS_public); 7254 CopyConstructor->setDefaulted(); 7255 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7256 7257 // Note that we have declared this constructor. 7258 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7259 7260 // Add the parameter to the constructor. 7261 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7262 ClassLoc, ClassLoc, 7263 /*IdentifierInfo=*/0, 7264 ArgType, /*TInfo=*/0, 7265 SC_None, 7266 SC_None, 0); 7267 CopyConstructor->setParams(&FromParam, 1); 7268 7269 if (Scope *S = getScopeForContext(ClassDecl)) 7270 PushOnScopeChains(CopyConstructor, S, false); 7271 ClassDecl->addDecl(CopyConstructor); 7272 7273 // C++0x [class.copy]p7: 7274 // ... If the class definition declares a move constructor or move 7275 // assignment operator, the implicitly declared constructor is defined as 7276 // deleted; ... 7277 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7278 ClassDecl->hasUserDeclaredMoveAssignment() || 7279 ShouldDeleteCopyConstructor(CopyConstructor)) 7280 CopyConstructor->setDeletedAsWritten(); 7281 7282 return CopyConstructor; 7283} 7284 7285void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7286 CXXConstructorDecl *CopyConstructor) { 7287 assert((CopyConstructor->isDefaulted() && 7288 CopyConstructor->isCopyConstructor() && 7289 !CopyConstructor->doesThisDeclarationHaveABody()) && 7290 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7291 7292 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7293 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7294 7295 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7296 DiagnosticErrorTrap Trap(Diags); 7297 7298 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7299 Trap.hasErrorOccurred()) { 7300 Diag(CurrentLocation, diag::note_member_synthesized_at) 7301 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7302 CopyConstructor->setInvalidDecl(); 7303 } else { 7304 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7305 CopyConstructor->getLocation(), 7306 MultiStmtArg(*this, 0, 0), 7307 /*isStmtExpr=*/false) 7308 .takeAs<Stmt>()); 7309 } 7310 7311 CopyConstructor->setUsed(); 7312 7313 if (ASTMutationListener *L = getASTMutationListener()) { 7314 L->CompletedImplicitDefinition(CopyConstructor); 7315 } 7316} 7317 7318ExprResult 7319Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7320 CXXConstructorDecl *Constructor, 7321 MultiExprArg ExprArgs, 7322 bool RequiresZeroInit, 7323 unsigned ConstructKind, 7324 SourceRange ParenRange) { 7325 bool Elidable = false; 7326 7327 // C++0x [class.copy]p34: 7328 // When certain criteria are met, an implementation is allowed to 7329 // omit the copy/move construction of a class object, even if the 7330 // copy/move constructor and/or destructor for the object have 7331 // side effects. [...] 7332 // - when a temporary class object that has not been bound to a 7333 // reference (12.2) would be copied/moved to a class object 7334 // with the same cv-unqualified type, the copy/move operation 7335 // can be omitted by constructing the temporary object 7336 // directly into the target of the omitted copy/move 7337 if (ConstructKind == CXXConstructExpr::CK_Complete && 7338 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7339 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7340 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7341 } 7342 7343 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7344 Elidable, move(ExprArgs), RequiresZeroInit, 7345 ConstructKind, ParenRange); 7346} 7347 7348/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7349/// including handling of its default argument expressions. 7350ExprResult 7351Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7352 CXXConstructorDecl *Constructor, bool Elidable, 7353 MultiExprArg ExprArgs, 7354 bool RequiresZeroInit, 7355 unsigned ConstructKind, 7356 SourceRange ParenRange) { 7357 unsigned NumExprs = ExprArgs.size(); 7358 Expr **Exprs = (Expr **)ExprArgs.release(); 7359 7360 for (specific_attr_iterator<NonNullAttr> 7361 i = Constructor->specific_attr_begin<NonNullAttr>(), 7362 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7363 const NonNullAttr *NonNull = *i; 7364 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7365 } 7366 7367 MarkDeclarationReferenced(ConstructLoc, Constructor); 7368 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7369 Constructor, Elidable, Exprs, NumExprs, 7370 RequiresZeroInit, 7371 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7372 ParenRange)); 7373} 7374 7375bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7376 CXXConstructorDecl *Constructor, 7377 MultiExprArg Exprs) { 7378 // FIXME: Provide the correct paren SourceRange when available. 7379 ExprResult TempResult = 7380 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7381 move(Exprs), false, CXXConstructExpr::CK_Complete, 7382 SourceRange()); 7383 if (TempResult.isInvalid()) 7384 return true; 7385 7386 Expr *Temp = TempResult.takeAs<Expr>(); 7387 CheckImplicitConversions(Temp, VD->getLocation()); 7388 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7389 Temp = MaybeCreateExprWithCleanups(Temp); 7390 VD->setInit(Temp); 7391 7392 return false; 7393} 7394 7395void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7396 if (VD->isInvalidDecl()) return; 7397 7398 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7399 if (ClassDecl->isInvalidDecl()) return; 7400 if (ClassDecl->hasTrivialDestructor()) return; 7401 if (ClassDecl->isDependentContext()) return; 7402 7403 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7404 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7405 CheckDestructorAccess(VD->getLocation(), Destructor, 7406 PDiag(diag::err_access_dtor_var) 7407 << VD->getDeclName() 7408 << VD->getType()); 7409 7410 if (!VD->hasGlobalStorage()) return; 7411 7412 // Emit warning for non-trivial dtor in global scope (a real global, 7413 // class-static, function-static). 7414 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7415 7416 // TODO: this should be re-enabled for static locals by !CXAAtExit 7417 if (!VD->isStaticLocal()) 7418 Diag(VD->getLocation(), diag::warn_global_destructor); 7419} 7420 7421/// AddCXXDirectInitializerToDecl - This action is called immediately after 7422/// ActOnDeclarator, when a C++ direct initializer is present. 7423/// e.g: "int x(1);" 7424void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7425 SourceLocation LParenLoc, 7426 MultiExprArg Exprs, 7427 SourceLocation RParenLoc, 7428 bool TypeMayContainAuto) { 7429 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7430 7431 // If there is no declaration, there was an error parsing it. Just ignore 7432 // the initializer. 7433 if (RealDecl == 0) 7434 return; 7435 7436 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7437 if (!VDecl) { 7438 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7439 RealDecl->setInvalidDecl(); 7440 return; 7441 } 7442 7443 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7444 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7445 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7446 if (Exprs.size() > 1) { 7447 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7448 diag::err_auto_var_init_multiple_expressions) 7449 << VDecl->getDeclName() << VDecl->getType() 7450 << VDecl->getSourceRange(); 7451 RealDecl->setInvalidDecl(); 7452 return; 7453 } 7454 7455 Expr *Init = Exprs.get()[0]; 7456 TypeSourceInfo *DeducedType = 0; 7457 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7458 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7459 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7460 << Init->getSourceRange(); 7461 if (!DeducedType) { 7462 RealDecl->setInvalidDecl(); 7463 return; 7464 } 7465 VDecl->setTypeSourceInfo(DeducedType); 7466 VDecl->setType(DeducedType->getType()); 7467 7468 // In ARC, infer lifetime. 7469 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7470 VDecl->setInvalidDecl(); 7471 7472 // If this is a redeclaration, check that the type we just deduced matches 7473 // the previously declared type. 7474 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7475 MergeVarDeclTypes(VDecl, Old); 7476 } 7477 7478 // We will represent direct-initialization similarly to copy-initialization: 7479 // int x(1); -as-> int x = 1; 7480 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7481 // 7482 // Clients that want to distinguish between the two forms, can check for 7483 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7484 // A major benefit is that clients that don't particularly care about which 7485 // exactly form was it (like the CodeGen) can handle both cases without 7486 // special case code. 7487 7488 // C++ 8.5p11: 7489 // The form of initialization (using parentheses or '=') is generally 7490 // insignificant, but does matter when the entity being initialized has a 7491 // class type. 7492 7493 if (!VDecl->getType()->isDependentType() && 7494 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7495 diag::err_typecheck_decl_incomplete_type)) { 7496 VDecl->setInvalidDecl(); 7497 return; 7498 } 7499 7500 // The variable can not have an abstract class type. 7501 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7502 diag::err_abstract_type_in_decl, 7503 AbstractVariableType)) 7504 VDecl->setInvalidDecl(); 7505 7506 const VarDecl *Def; 7507 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7508 Diag(VDecl->getLocation(), diag::err_redefinition) 7509 << VDecl->getDeclName(); 7510 Diag(Def->getLocation(), diag::note_previous_definition); 7511 VDecl->setInvalidDecl(); 7512 return; 7513 } 7514 7515 // C++ [class.static.data]p4 7516 // If a static data member is of const integral or const 7517 // enumeration type, its declaration in the class definition can 7518 // specify a constant-initializer which shall be an integral 7519 // constant expression (5.19). In that case, the member can appear 7520 // in integral constant expressions. The member shall still be 7521 // defined in a namespace scope if it is used in the program and the 7522 // namespace scope definition shall not contain an initializer. 7523 // 7524 // We already performed a redefinition check above, but for static 7525 // data members we also need to check whether there was an in-class 7526 // declaration with an initializer. 7527 const VarDecl* PrevInit = 0; 7528 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7529 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7530 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7531 return; 7532 } 7533 7534 bool IsDependent = false; 7535 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7536 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7537 VDecl->setInvalidDecl(); 7538 return; 7539 } 7540 7541 if (Exprs.get()[I]->isTypeDependent()) 7542 IsDependent = true; 7543 } 7544 7545 // If either the declaration has a dependent type or if any of the 7546 // expressions is type-dependent, we represent the initialization 7547 // via a ParenListExpr for later use during template instantiation. 7548 if (VDecl->getType()->isDependentType() || IsDependent) { 7549 // Let clients know that initialization was done with a direct initializer. 7550 VDecl->setCXXDirectInitializer(true); 7551 7552 // Store the initialization expressions as a ParenListExpr. 7553 unsigned NumExprs = Exprs.size(); 7554 VDecl->setInit(new (Context) ParenListExpr( 7555 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 7556 VDecl->getType().getNonReferenceType())); 7557 return; 7558 } 7559 7560 // Capture the variable that is being initialized and the style of 7561 // initialization. 7562 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7563 7564 // FIXME: Poor source location information. 7565 InitializationKind Kind 7566 = InitializationKind::CreateDirect(VDecl->getLocation(), 7567 LParenLoc, RParenLoc); 7568 7569 InitializationSequence InitSeq(*this, Entity, Kind, 7570 Exprs.get(), Exprs.size()); 7571 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7572 if (Result.isInvalid()) { 7573 VDecl->setInvalidDecl(); 7574 return; 7575 } 7576 7577 CheckImplicitConversions(Result.get(), LParenLoc); 7578 7579 Result = MaybeCreateExprWithCleanups(Result); 7580 VDecl->setInit(Result.takeAs<Expr>()); 7581 VDecl->setCXXDirectInitializer(true); 7582 7583 CheckCompleteVariableDeclaration(VDecl); 7584} 7585 7586/// \brief Given a constructor and the set of arguments provided for the 7587/// constructor, convert the arguments and add any required default arguments 7588/// to form a proper call to this constructor. 7589/// 7590/// \returns true if an error occurred, false otherwise. 7591bool 7592Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7593 MultiExprArg ArgsPtr, 7594 SourceLocation Loc, 7595 ASTOwningVector<Expr*> &ConvertedArgs) { 7596 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7597 unsigned NumArgs = ArgsPtr.size(); 7598 Expr **Args = (Expr **)ArgsPtr.get(); 7599 7600 const FunctionProtoType *Proto 7601 = Constructor->getType()->getAs<FunctionProtoType>(); 7602 assert(Proto && "Constructor without a prototype?"); 7603 unsigned NumArgsInProto = Proto->getNumArgs(); 7604 7605 // If too few arguments are available, we'll fill in the rest with defaults. 7606 if (NumArgs < NumArgsInProto) 7607 ConvertedArgs.reserve(NumArgsInProto); 7608 else 7609 ConvertedArgs.reserve(NumArgs); 7610 7611 VariadicCallType CallType = 7612 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7613 SmallVector<Expr *, 8> AllArgs; 7614 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7615 Proto, 0, Args, NumArgs, AllArgs, 7616 CallType); 7617 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7618 ConvertedArgs.push_back(AllArgs[i]); 7619 return Invalid; 7620} 7621 7622static inline bool 7623CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7624 const FunctionDecl *FnDecl) { 7625 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7626 if (isa<NamespaceDecl>(DC)) { 7627 return SemaRef.Diag(FnDecl->getLocation(), 7628 diag::err_operator_new_delete_declared_in_namespace) 7629 << FnDecl->getDeclName(); 7630 } 7631 7632 if (isa<TranslationUnitDecl>(DC) && 7633 FnDecl->getStorageClass() == SC_Static) { 7634 return SemaRef.Diag(FnDecl->getLocation(), 7635 diag::err_operator_new_delete_declared_static) 7636 << FnDecl->getDeclName(); 7637 } 7638 7639 return false; 7640} 7641 7642static inline bool 7643CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7644 CanQualType ExpectedResultType, 7645 CanQualType ExpectedFirstParamType, 7646 unsigned DependentParamTypeDiag, 7647 unsigned InvalidParamTypeDiag) { 7648 QualType ResultType = 7649 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7650 7651 // Check that the result type is not dependent. 7652 if (ResultType->isDependentType()) 7653 return SemaRef.Diag(FnDecl->getLocation(), 7654 diag::err_operator_new_delete_dependent_result_type) 7655 << FnDecl->getDeclName() << ExpectedResultType; 7656 7657 // Check that the result type is what we expect. 7658 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7659 return SemaRef.Diag(FnDecl->getLocation(), 7660 diag::err_operator_new_delete_invalid_result_type) 7661 << FnDecl->getDeclName() << ExpectedResultType; 7662 7663 // A function template must have at least 2 parameters. 7664 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7665 return SemaRef.Diag(FnDecl->getLocation(), 7666 diag::err_operator_new_delete_template_too_few_parameters) 7667 << FnDecl->getDeclName(); 7668 7669 // The function decl must have at least 1 parameter. 7670 if (FnDecl->getNumParams() == 0) 7671 return SemaRef.Diag(FnDecl->getLocation(), 7672 diag::err_operator_new_delete_too_few_parameters) 7673 << FnDecl->getDeclName(); 7674 7675 // Check the the first parameter type is not dependent. 7676 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7677 if (FirstParamType->isDependentType()) 7678 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7679 << FnDecl->getDeclName() << ExpectedFirstParamType; 7680 7681 // Check that the first parameter type is what we expect. 7682 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7683 ExpectedFirstParamType) 7684 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7685 << FnDecl->getDeclName() << ExpectedFirstParamType; 7686 7687 return false; 7688} 7689 7690static bool 7691CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7692 // C++ [basic.stc.dynamic.allocation]p1: 7693 // A program is ill-formed if an allocation function is declared in a 7694 // namespace scope other than global scope or declared static in global 7695 // scope. 7696 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7697 return true; 7698 7699 CanQualType SizeTy = 7700 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7701 7702 // C++ [basic.stc.dynamic.allocation]p1: 7703 // The return type shall be void*. The first parameter shall have type 7704 // std::size_t. 7705 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7706 SizeTy, 7707 diag::err_operator_new_dependent_param_type, 7708 diag::err_operator_new_param_type)) 7709 return true; 7710 7711 // C++ [basic.stc.dynamic.allocation]p1: 7712 // The first parameter shall not have an associated default argument. 7713 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7714 return SemaRef.Diag(FnDecl->getLocation(), 7715 diag::err_operator_new_default_arg) 7716 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7717 7718 return false; 7719} 7720 7721static bool 7722CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7723 // C++ [basic.stc.dynamic.deallocation]p1: 7724 // A program is ill-formed if deallocation functions are declared in a 7725 // namespace scope other than global scope or declared static in global 7726 // scope. 7727 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7728 return true; 7729 7730 // C++ [basic.stc.dynamic.deallocation]p2: 7731 // Each deallocation function shall return void and its first parameter 7732 // shall be void*. 7733 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7734 SemaRef.Context.VoidPtrTy, 7735 diag::err_operator_delete_dependent_param_type, 7736 diag::err_operator_delete_param_type)) 7737 return true; 7738 7739 return false; 7740} 7741 7742/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7743/// of this overloaded operator is well-formed. If so, returns false; 7744/// otherwise, emits appropriate diagnostics and returns true. 7745bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7746 assert(FnDecl && FnDecl->isOverloadedOperator() && 7747 "Expected an overloaded operator declaration"); 7748 7749 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7750 7751 // C++ [over.oper]p5: 7752 // The allocation and deallocation functions, operator new, 7753 // operator new[], operator delete and operator delete[], are 7754 // described completely in 3.7.3. The attributes and restrictions 7755 // found in the rest of this subclause do not apply to them unless 7756 // explicitly stated in 3.7.3. 7757 if (Op == OO_Delete || Op == OO_Array_Delete) 7758 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7759 7760 if (Op == OO_New || Op == OO_Array_New) 7761 return CheckOperatorNewDeclaration(*this, FnDecl); 7762 7763 // C++ [over.oper]p6: 7764 // An operator function shall either be a non-static member 7765 // function or be a non-member function and have at least one 7766 // parameter whose type is a class, a reference to a class, an 7767 // enumeration, or a reference to an enumeration. 7768 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7769 if (MethodDecl->isStatic()) 7770 return Diag(FnDecl->getLocation(), 7771 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7772 } else { 7773 bool ClassOrEnumParam = false; 7774 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7775 ParamEnd = FnDecl->param_end(); 7776 Param != ParamEnd; ++Param) { 7777 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7778 if (ParamType->isDependentType() || ParamType->isRecordType() || 7779 ParamType->isEnumeralType()) { 7780 ClassOrEnumParam = true; 7781 break; 7782 } 7783 } 7784 7785 if (!ClassOrEnumParam) 7786 return Diag(FnDecl->getLocation(), 7787 diag::err_operator_overload_needs_class_or_enum) 7788 << FnDecl->getDeclName(); 7789 } 7790 7791 // C++ [over.oper]p8: 7792 // An operator function cannot have default arguments (8.3.6), 7793 // except where explicitly stated below. 7794 // 7795 // Only the function-call operator allows default arguments 7796 // (C++ [over.call]p1). 7797 if (Op != OO_Call) { 7798 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7799 Param != FnDecl->param_end(); ++Param) { 7800 if ((*Param)->hasDefaultArg()) 7801 return Diag((*Param)->getLocation(), 7802 diag::err_operator_overload_default_arg) 7803 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7804 } 7805 } 7806 7807 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7808 { false, false, false } 7809#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7810 , { Unary, Binary, MemberOnly } 7811#include "clang/Basic/OperatorKinds.def" 7812 }; 7813 7814 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7815 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7816 bool MustBeMemberOperator = OperatorUses[Op][2]; 7817 7818 // C++ [over.oper]p8: 7819 // [...] Operator functions cannot have more or fewer parameters 7820 // than the number required for the corresponding operator, as 7821 // described in the rest of this subclause. 7822 unsigned NumParams = FnDecl->getNumParams() 7823 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7824 if (Op != OO_Call && 7825 ((NumParams == 1 && !CanBeUnaryOperator) || 7826 (NumParams == 2 && !CanBeBinaryOperator) || 7827 (NumParams < 1) || (NumParams > 2))) { 7828 // We have the wrong number of parameters. 7829 unsigned ErrorKind; 7830 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7831 ErrorKind = 2; // 2 -> unary or binary. 7832 } else if (CanBeUnaryOperator) { 7833 ErrorKind = 0; // 0 -> unary 7834 } else { 7835 assert(CanBeBinaryOperator && 7836 "All non-call overloaded operators are unary or binary!"); 7837 ErrorKind = 1; // 1 -> binary 7838 } 7839 7840 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7841 << FnDecl->getDeclName() << NumParams << ErrorKind; 7842 } 7843 7844 // Overloaded operators other than operator() cannot be variadic. 7845 if (Op != OO_Call && 7846 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7847 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7848 << FnDecl->getDeclName(); 7849 } 7850 7851 // Some operators must be non-static member functions. 7852 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7853 return Diag(FnDecl->getLocation(), 7854 diag::err_operator_overload_must_be_member) 7855 << FnDecl->getDeclName(); 7856 } 7857 7858 // C++ [over.inc]p1: 7859 // The user-defined function called operator++ implements the 7860 // prefix and postfix ++ operator. If this function is a member 7861 // function with no parameters, or a non-member function with one 7862 // parameter of class or enumeration type, it defines the prefix 7863 // increment operator ++ for objects of that type. If the function 7864 // is a member function with one parameter (which shall be of type 7865 // int) or a non-member function with two parameters (the second 7866 // of which shall be of type int), it defines the postfix 7867 // increment operator ++ for objects of that type. 7868 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7869 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7870 bool ParamIsInt = false; 7871 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7872 ParamIsInt = BT->getKind() == BuiltinType::Int; 7873 7874 if (!ParamIsInt) 7875 return Diag(LastParam->getLocation(), 7876 diag::err_operator_overload_post_incdec_must_be_int) 7877 << LastParam->getType() << (Op == OO_MinusMinus); 7878 } 7879 7880 return false; 7881} 7882 7883/// CheckLiteralOperatorDeclaration - Check whether the declaration 7884/// of this literal operator function is well-formed. If so, returns 7885/// false; otherwise, emits appropriate diagnostics and returns true. 7886bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7887 DeclContext *DC = FnDecl->getDeclContext(); 7888 Decl::Kind Kind = DC->getDeclKind(); 7889 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7890 Kind != Decl::LinkageSpec) { 7891 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7892 << FnDecl->getDeclName(); 7893 return true; 7894 } 7895 7896 bool Valid = false; 7897 7898 // template <char...> type operator "" name() is the only valid template 7899 // signature, and the only valid signature with no parameters. 7900 if (FnDecl->param_size() == 0) { 7901 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7902 // Must have only one template parameter 7903 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7904 if (Params->size() == 1) { 7905 NonTypeTemplateParmDecl *PmDecl = 7906 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7907 7908 // The template parameter must be a char parameter pack. 7909 if (PmDecl && PmDecl->isTemplateParameterPack() && 7910 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7911 Valid = true; 7912 } 7913 } 7914 } else { 7915 // Check the first parameter 7916 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7917 7918 QualType T = (*Param)->getType(); 7919 7920 // unsigned long long int, long double, and any character type are allowed 7921 // as the only parameters. 7922 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7923 Context.hasSameType(T, Context.LongDoubleTy) || 7924 Context.hasSameType(T, Context.CharTy) || 7925 Context.hasSameType(T, Context.WCharTy) || 7926 Context.hasSameType(T, Context.Char16Ty) || 7927 Context.hasSameType(T, Context.Char32Ty)) { 7928 if (++Param == FnDecl->param_end()) 7929 Valid = true; 7930 goto FinishedParams; 7931 } 7932 7933 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7934 const PointerType *PT = T->getAs<PointerType>(); 7935 if (!PT) 7936 goto FinishedParams; 7937 T = PT->getPointeeType(); 7938 if (!T.isConstQualified()) 7939 goto FinishedParams; 7940 T = T.getUnqualifiedType(); 7941 7942 // Move on to the second parameter; 7943 ++Param; 7944 7945 // If there is no second parameter, the first must be a const char * 7946 if (Param == FnDecl->param_end()) { 7947 if (Context.hasSameType(T, Context.CharTy)) 7948 Valid = true; 7949 goto FinishedParams; 7950 } 7951 7952 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7953 // are allowed as the first parameter to a two-parameter function 7954 if (!(Context.hasSameType(T, Context.CharTy) || 7955 Context.hasSameType(T, Context.WCharTy) || 7956 Context.hasSameType(T, Context.Char16Ty) || 7957 Context.hasSameType(T, Context.Char32Ty))) 7958 goto FinishedParams; 7959 7960 // The second and final parameter must be an std::size_t 7961 T = (*Param)->getType().getUnqualifiedType(); 7962 if (Context.hasSameType(T, Context.getSizeType()) && 7963 ++Param == FnDecl->param_end()) 7964 Valid = true; 7965 } 7966 7967 // FIXME: This diagnostic is absolutely terrible. 7968FinishedParams: 7969 if (!Valid) { 7970 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7971 << FnDecl->getDeclName(); 7972 return true; 7973 } 7974 7975 return false; 7976} 7977 7978/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7979/// linkage specification, including the language and (if present) 7980/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7981/// the location of the language string literal, which is provided 7982/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7983/// the '{' brace. Otherwise, this linkage specification does not 7984/// have any braces. 7985Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7986 SourceLocation LangLoc, 7987 StringRef Lang, 7988 SourceLocation LBraceLoc) { 7989 LinkageSpecDecl::LanguageIDs Language; 7990 if (Lang == "\"C\"") 7991 Language = LinkageSpecDecl::lang_c; 7992 else if (Lang == "\"C++\"") 7993 Language = LinkageSpecDecl::lang_cxx; 7994 else { 7995 Diag(LangLoc, diag::err_bad_language); 7996 return 0; 7997 } 7998 7999 // FIXME: Add all the various semantics of linkage specifications 8000 8001 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 8002 ExternLoc, LangLoc, Language); 8003 CurContext->addDecl(D); 8004 PushDeclContext(S, D); 8005 return D; 8006} 8007 8008/// ActOnFinishLinkageSpecification - Complete the definition of 8009/// the C++ linkage specification LinkageSpec. If RBraceLoc is 8010/// valid, it's the position of the closing '}' brace in a linkage 8011/// specification that uses braces. 8012Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 8013 Decl *LinkageSpec, 8014 SourceLocation RBraceLoc) { 8015 if (LinkageSpec) { 8016 if (RBraceLoc.isValid()) { 8017 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 8018 LSDecl->setRBraceLoc(RBraceLoc); 8019 } 8020 PopDeclContext(); 8021 } 8022 return LinkageSpec; 8023} 8024 8025/// \brief Perform semantic analysis for the variable declaration that 8026/// occurs within a C++ catch clause, returning the newly-created 8027/// variable. 8028VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 8029 TypeSourceInfo *TInfo, 8030 SourceLocation StartLoc, 8031 SourceLocation Loc, 8032 IdentifierInfo *Name) { 8033 bool Invalid = false; 8034 QualType ExDeclType = TInfo->getType(); 8035 8036 // Arrays and functions decay. 8037 if (ExDeclType->isArrayType()) 8038 ExDeclType = Context.getArrayDecayedType(ExDeclType); 8039 else if (ExDeclType->isFunctionType()) 8040 ExDeclType = Context.getPointerType(ExDeclType); 8041 8042 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 8043 // The exception-declaration shall not denote a pointer or reference to an 8044 // incomplete type, other than [cv] void*. 8045 // N2844 forbids rvalue references. 8046 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 8047 Diag(Loc, diag::err_catch_rvalue_ref); 8048 Invalid = true; 8049 } 8050 8051 // GCC allows catching pointers and references to incomplete types 8052 // as an extension; so do we, but we warn by default. 8053 8054 QualType BaseType = ExDeclType; 8055 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8056 unsigned DK = diag::err_catch_incomplete; 8057 bool IncompleteCatchIsInvalid = true; 8058 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8059 BaseType = Ptr->getPointeeType(); 8060 Mode = 1; 8061 DK = diag::ext_catch_incomplete_ptr; 8062 IncompleteCatchIsInvalid = false; 8063 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8064 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8065 BaseType = Ref->getPointeeType(); 8066 Mode = 2; 8067 DK = diag::ext_catch_incomplete_ref; 8068 IncompleteCatchIsInvalid = false; 8069 } 8070 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8071 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8072 IncompleteCatchIsInvalid) 8073 Invalid = true; 8074 8075 if (!Invalid && !ExDeclType->isDependentType() && 8076 RequireNonAbstractType(Loc, ExDeclType, 8077 diag::err_abstract_type_in_decl, 8078 AbstractVariableType)) 8079 Invalid = true; 8080 8081 // Only the non-fragile NeXT runtime currently supports C++ catches 8082 // of ObjC types, and no runtime supports catching ObjC types by value. 8083 if (!Invalid && getLangOptions().ObjC1) { 8084 QualType T = ExDeclType; 8085 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8086 T = RT->getPointeeType(); 8087 8088 if (T->isObjCObjectType()) { 8089 Diag(Loc, diag::err_objc_object_catch); 8090 Invalid = true; 8091 } else if (T->isObjCObjectPointerType()) { 8092 if (!getLangOptions().ObjCNonFragileABI) 8093 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 8094 } 8095 } 8096 8097 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8098 ExDeclType, TInfo, SC_None, SC_None); 8099 ExDecl->setExceptionVariable(true); 8100 8101 if (!Invalid && !ExDeclType->isDependentType()) { 8102 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8103 // C++ [except.handle]p16: 8104 // The object declared in an exception-declaration or, if the 8105 // exception-declaration does not specify a name, a temporary (12.2) is 8106 // copy-initialized (8.5) from the exception object. [...] 8107 // The object is destroyed when the handler exits, after the destruction 8108 // of any automatic objects initialized within the handler. 8109 // 8110 // We just pretend to initialize the object with itself, then make sure 8111 // it can be destroyed later. 8112 QualType initType = ExDeclType; 8113 8114 InitializedEntity entity = 8115 InitializedEntity::InitializeVariable(ExDecl); 8116 InitializationKind initKind = 8117 InitializationKind::CreateCopy(Loc, SourceLocation()); 8118 8119 Expr *opaqueValue = 8120 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8121 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8122 ExprResult result = sequence.Perform(*this, entity, initKind, 8123 MultiExprArg(&opaqueValue, 1)); 8124 if (result.isInvalid()) 8125 Invalid = true; 8126 else { 8127 // If the constructor used was non-trivial, set this as the 8128 // "initializer". 8129 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8130 if (!construct->getConstructor()->isTrivial()) { 8131 Expr *init = MaybeCreateExprWithCleanups(construct); 8132 ExDecl->setInit(init); 8133 } 8134 8135 // And make sure it's destructable. 8136 FinalizeVarWithDestructor(ExDecl, recordType); 8137 } 8138 } 8139 } 8140 8141 if (Invalid) 8142 ExDecl->setInvalidDecl(); 8143 8144 return ExDecl; 8145} 8146 8147/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8148/// handler. 8149Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8150 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8151 bool Invalid = D.isInvalidType(); 8152 8153 // Check for unexpanded parameter packs. 8154 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8155 UPPC_ExceptionType)) { 8156 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8157 D.getIdentifierLoc()); 8158 Invalid = true; 8159 } 8160 8161 IdentifierInfo *II = D.getIdentifier(); 8162 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8163 LookupOrdinaryName, 8164 ForRedeclaration)) { 8165 // The scope should be freshly made just for us. There is just no way 8166 // it contains any previous declaration. 8167 assert(!S->isDeclScope(PrevDecl)); 8168 if (PrevDecl->isTemplateParameter()) { 8169 // Maybe we will complain about the shadowed template parameter. 8170 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8171 } 8172 } 8173 8174 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8175 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8176 << D.getCXXScopeSpec().getRange(); 8177 Invalid = true; 8178 } 8179 8180 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8181 D.getSourceRange().getBegin(), 8182 D.getIdentifierLoc(), 8183 D.getIdentifier()); 8184 if (Invalid) 8185 ExDecl->setInvalidDecl(); 8186 8187 // Add the exception declaration into this scope. 8188 if (II) 8189 PushOnScopeChains(ExDecl, S); 8190 else 8191 CurContext->addDecl(ExDecl); 8192 8193 ProcessDeclAttributes(S, ExDecl, D); 8194 return ExDecl; 8195} 8196 8197Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8198 Expr *AssertExpr, 8199 Expr *AssertMessageExpr_, 8200 SourceLocation RParenLoc) { 8201 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8202 8203 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8204 llvm::APSInt Value(32); 8205 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8206 Diag(StaticAssertLoc, 8207 diag::err_static_assert_expression_is_not_constant) << 8208 AssertExpr->getSourceRange(); 8209 return 0; 8210 } 8211 8212 if (Value == 0) { 8213 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8214 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8215 } 8216 } 8217 8218 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8219 return 0; 8220 8221 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8222 AssertExpr, AssertMessage, RParenLoc); 8223 8224 CurContext->addDecl(Decl); 8225 return Decl; 8226} 8227 8228/// \brief Perform semantic analysis of the given friend type declaration. 8229/// 8230/// \returns A friend declaration that. 8231FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8232 TypeSourceInfo *TSInfo) { 8233 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8234 8235 QualType T = TSInfo->getType(); 8236 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8237 8238 if (!getLangOptions().CPlusPlus0x) { 8239 // C++03 [class.friend]p2: 8240 // An elaborated-type-specifier shall be used in a friend declaration 8241 // for a class.* 8242 // 8243 // * The class-key of the elaborated-type-specifier is required. 8244 if (!ActiveTemplateInstantiations.empty()) { 8245 // Do not complain about the form of friend template types during 8246 // template instantiation; we will already have complained when the 8247 // template was declared. 8248 } else if (!T->isElaboratedTypeSpecifier()) { 8249 // If we evaluated the type to a record type, suggest putting 8250 // a tag in front. 8251 if (const RecordType *RT = T->getAs<RecordType>()) { 8252 RecordDecl *RD = RT->getDecl(); 8253 8254 std::string InsertionText = std::string(" ") + RD->getKindName(); 8255 8256 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8257 << (unsigned) RD->getTagKind() 8258 << T 8259 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8260 InsertionText); 8261 } else { 8262 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8263 << T 8264 << SourceRange(FriendLoc, TypeRange.getEnd()); 8265 } 8266 } else if (T->getAs<EnumType>()) { 8267 Diag(FriendLoc, diag::ext_enum_friend) 8268 << T 8269 << SourceRange(FriendLoc, TypeRange.getEnd()); 8270 } 8271 } 8272 8273 // C++0x [class.friend]p3: 8274 // If the type specifier in a friend declaration designates a (possibly 8275 // cv-qualified) class type, that class is declared as a friend; otherwise, 8276 // the friend declaration is ignored. 8277 8278 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8279 // in [class.friend]p3 that we do not implement. 8280 8281 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8282} 8283 8284/// Handle a friend tag declaration where the scope specifier was 8285/// templated. 8286Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8287 unsigned TagSpec, SourceLocation TagLoc, 8288 CXXScopeSpec &SS, 8289 IdentifierInfo *Name, SourceLocation NameLoc, 8290 AttributeList *Attr, 8291 MultiTemplateParamsArg TempParamLists) { 8292 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8293 8294 bool isExplicitSpecialization = false; 8295 bool Invalid = false; 8296 8297 if (TemplateParameterList *TemplateParams 8298 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8299 TempParamLists.get(), 8300 TempParamLists.size(), 8301 /*friend*/ true, 8302 isExplicitSpecialization, 8303 Invalid)) { 8304 if (TemplateParams->size() > 0) { 8305 // This is a declaration of a class template. 8306 if (Invalid) 8307 return 0; 8308 8309 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8310 SS, Name, NameLoc, Attr, 8311 TemplateParams, AS_public, 8312 TempParamLists.size() - 1, 8313 (TemplateParameterList**) TempParamLists.release()).take(); 8314 } else { 8315 // The "template<>" header is extraneous. 8316 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8317 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8318 isExplicitSpecialization = true; 8319 } 8320 } 8321 8322 if (Invalid) return 0; 8323 8324 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8325 8326 bool isAllExplicitSpecializations = true; 8327 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8328 if (TempParamLists.get()[I]->size()) { 8329 isAllExplicitSpecializations = false; 8330 break; 8331 } 8332 } 8333 8334 // FIXME: don't ignore attributes. 8335 8336 // If it's explicit specializations all the way down, just forget 8337 // about the template header and build an appropriate non-templated 8338 // friend. TODO: for source fidelity, remember the headers. 8339 if (isAllExplicitSpecializations) { 8340 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8341 ElaboratedTypeKeyword Keyword 8342 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8343 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8344 *Name, NameLoc); 8345 if (T.isNull()) 8346 return 0; 8347 8348 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8349 if (isa<DependentNameType>(T)) { 8350 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8351 TL.setKeywordLoc(TagLoc); 8352 TL.setQualifierLoc(QualifierLoc); 8353 TL.setNameLoc(NameLoc); 8354 } else { 8355 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8356 TL.setKeywordLoc(TagLoc); 8357 TL.setQualifierLoc(QualifierLoc); 8358 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8359 } 8360 8361 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8362 TSI, FriendLoc); 8363 Friend->setAccess(AS_public); 8364 CurContext->addDecl(Friend); 8365 return Friend; 8366 } 8367 8368 // Handle the case of a templated-scope friend class. e.g. 8369 // template <class T> class A<T>::B; 8370 // FIXME: we don't support these right now. 8371 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8372 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8373 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8374 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8375 TL.setKeywordLoc(TagLoc); 8376 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8377 TL.setNameLoc(NameLoc); 8378 8379 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8380 TSI, FriendLoc); 8381 Friend->setAccess(AS_public); 8382 Friend->setUnsupportedFriend(true); 8383 CurContext->addDecl(Friend); 8384 return Friend; 8385} 8386 8387 8388/// Handle a friend type declaration. This works in tandem with 8389/// ActOnTag. 8390/// 8391/// Notes on friend class templates: 8392/// 8393/// We generally treat friend class declarations as if they were 8394/// declaring a class. So, for example, the elaborated type specifier 8395/// in a friend declaration is required to obey the restrictions of a 8396/// class-head (i.e. no typedefs in the scope chain), template 8397/// parameters are required to match up with simple template-ids, &c. 8398/// However, unlike when declaring a template specialization, it's 8399/// okay to refer to a template specialization without an empty 8400/// template parameter declaration, e.g. 8401/// friend class A<T>::B<unsigned>; 8402/// We permit this as a special case; if there are any template 8403/// parameters present at all, require proper matching, i.e. 8404/// template <> template <class T> friend class A<int>::B; 8405Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8406 MultiTemplateParamsArg TempParams) { 8407 SourceLocation Loc = DS.getSourceRange().getBegin(); 8408 8409 assert(DS.isFriendSpecified()); 8410 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8411 8412 // Try to convert the decl specifier to a type. This works for 8413 // friend templates because ActOnTag never produces a ClassTemplateDecl 8414 // for a TUK_Friend. 8415 Declarator TheDeclarator(DS, Declarator::MemberContext); 8416 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8417 QualType T = TSI->getType(); 8418 if (TheDeclarator.isInvalidType()) 8419 return 0; 8420 8421 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8422 return 0; 8423 8424 // This is definitely an error in C++98. It's probably meant to 8425 // be forbidden in C++0x, too, but the specification is just 8426 // poorly written. 8427 // 8428 // The problem is with declarations like the following: 8429 // template <T> friend A<T>::foo; 8430 // where deciding whether a class C is a friend or not now hinges 8431 // on whether there exists an instantiation of A that causes 8432 // 'foo' to equal C. There are restrictions on class-heads 8433 // (which we declare (by fiat) elaborated friend declarations to 8434 // be) that makes this tractable. 8435 // 8436 // FIXME: handle "template <> friend class A<T>;", which 8437 // is possibly well-formed? Who even knows? 8438 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8439 Diag(Loc, diag::err_tagless_friend_type_template) 8440 << DS.getSourceRange(); 8441 return 0; 8442 } 8443 8444 // C++98 [class.friend]p1: A friend of a class is a function 8445 // or class that is not a member of the class . . . 8446 // This is fixed in DR77, which just barely didn't make the C++03 8447 // deadline. It's also a very silly restriction that seriously 8448 // affects inner classes and which nobody else seems to implement; 8449 // thus we never diagnose it, not even in -pedantic. 8450 // 8451 // But note that we could warn about it: it's always useless to 8452 // friend one of your own members (it's not, however, worthless to 8453 // friend a member of an arbitrary specialization of your template). 8454 8455 Decl *D; 8456 if (unsigned NumTempParamLists = TempParams.size()) 8457 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8458 NumTempParamLists, 8459 TempParams.release(), 8460 TSI, 8461 DS.getFriendSpecLoc()); 8462 else 8463 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8464 8465 if (!D) 8466 return 0; 8467 8468 D->setAccess(AS_public); 8469 CurContext->addDecl(D); 8470 8471 return D; 8472} 8473 8474Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8475 MultiTemplateParamsArg TemplateParams) { 8476 const DeclSpec &DS = D.getDeclSpec(); 8477 8478 assert(DS.isFriendSpecified()); 8479 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8480 8481 SourceLocation Loc = D.getIdentifierLoc(); 8482 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8483 QualType T = TInfo->getType(); 8484 8485 // C++ [class.friend]p1 8486 // A friend of a class is a function or class.... 8487 // Note that this sees through typedefs, which is intended. 8488 // It *doesn't* see through dependent types, which is correct 8489 // according to [temp.arg.type]p3: 8490 // If a declaration acquires a function type through a 8491 // type dependent on a template-parameter and this causes 8492 // a declaration that does not use the syntactic form of a 8493 // function declarator to have a function type, the program 8494 // is ill-formed. 8495 if (!T->isFunctionType()) { 8496 Diag(Loc, diag::err_unexpected_friend); 8497 8498 // It might be worthwhile to try to recover by creating an 8499 // appropriate declaration. 8500 return 0; 8501 } 8502 8503 // C++ [namespace.memdef]p3 8504 // - If a friend declaration in a non-local class first declares a 8505 // class or function, the friend class or function is a member 8506 // of the innermost enclosing namespace. 8507 // - The name of the friend is not found by simple name lookup 8508 // until a matching declaration is provided in that namespace 8509 // scope (either before or after the class declaration granting 8510 // friendship). 8511 // - If a friend function is called, its name may be found by the 8512 // name lookup that considers functions from namespaces and 8513 // classes associated with the types of the function arguments. 8514 // - When looking for a prior declaration of a class or a function 8515 // declared as a friend, scopes outside the innermost enclosing 8516 // namespace scope are not considered. 8517 8518 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8519 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8520 DeclarationName Name = NameInfo.getName(); 8521 assert(Name); 8522 8523 // Check for unexpanded parameter packs. 8524 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8525 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8526 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8527 return 0; 8528 8529 // The context we found the declaration in, or in which we should 8530 // create the declaration. 8531 DeclContext *DC; 8532 Scope *DCScope = S; 8533 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8534 ForRedeclaration); 8535 8536 // FIXME: there are different rules in local classes 8537 8538 // There are four cases here. 8539 // - There's no scope specifier, in which case we just go to the 8540 // appropriate scope and look for a function or function template 8541 // there as appropriate. 8542 // Recover from invalid scope qualifiers as if they just weren't there. 8543 if (SS.isInvalid() || !SS.isSet()) { 8544 // C++0x [namespace.memdef]p3: 8545 // If the name in a friend declaration is neither qualified nor 8546 // a template-id and the declaration is a function or an 8547 // elaborated-type-specifier, the lookup to determine whether 8548 // the entity has been previously declared shall not consider 8549 // any scopes outside the innermost enclosing namespace. 8550 // C++0x [class.friend]p11: 8551 // If a friend declaration appears in a local class and the name 8552 // specified is an unqualified name, a prior declaration is 8553 // looked up without considering scopes that are outside the 8554 // innermost enclosing non-class scope. For a friend function 8555 // declaration, if there is no prior declaration, the program is 8556 // ill-formed. 8557 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8558 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8559 8560 // Find the appropriate context according to the above. 8561 DC = CurContext; 8562 while (true) { 8563 // Skip class contexts. If someone can cite chapter and verse 8564 // for this behavior, that would be nice --- it's what GCC and 8565 // EDG do, and it seems like a reasonable intent, but the spec 8566 // really only says that checks for unqualified existing 8567 // declarations should stop at the nearest enclosing namespace, 8568 // not that they should only consider the nearest enclosing 8569 // namespace. 8570 while (DC->isRecord()) 8571 DC = DC->getParent(); 8572 8573 LookupQualifiedName(Previous, DC); 8574 8575 // TODO: decide what we think about using declarations. 8576 if (isLocal || !Previous.empty()) 8577 break; 8578 8579 if (isTemplateId) { 8580 if (isa<TranslationUnitDecl>(DC)) break; 8581 } else { 8582 if (DC->isFileContext()) break; 8583 } 8584 DC = DC->getParent(); 8585 } 8586 8587 // C++ [class.friend]p1: A friend of a class is a function or 8588 // class that is not a member of the class . . . 8589 // C++0x changes this for both friend types and functions. 8590 // Most C++ 98 compilers do seem to give an error here, so 8591 // we do, too. 8592 if (!Previous.empty() && DC->Equals(CurContext) 8593 && !getLangOptions().CPlusPlus0x) 8594 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8595 8596 DCScope = getScopeForDeclContext(S, DC); 8597 8598 // - There's a non-dependent scope specifier, in which case we 8599 // compute it and do a previous lookup there for a function 8600 // or function template. 8601 } else if (!SS.getScopeRep()->isDependent()) { 8602 DC = computeDeclContext(SS); 8603 if (!DC) return 0; 8604 8605 if (RequireCompleteDeclContext(SS, DC)) return 0; 8606 8607 LookupQualifiedName(Previous, DC); 8608 8609 // Ignore things found implicitly in the wrong scope. 8610 // TODO: better diagnostics for this case. Suggesting the right 8611 // qualified scope would be nice... 8612 LookupResult::Filter F = Previous.makeFilter(); 8613 while (F.hasNext()) { 8614 NamedDecl *D = F.next(); 8615 if (!DC->InEnclosingNamespaceSetOf( 8616 D->getDeclContext()->getRedeclContext())) 8617 F.erase(); 8618 } 8619 F.done(); 8620 8621 if (Previous.empty()) { 8622 D.setInvalidType(); 8623 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8624 return 0; 8625 } 8626 8627 // C++ [class.friend]p1: A friend of a class is a function or 8628 // class that is not a member of the class . . . 8629 if (DC->Equals(CurContext)) 8630 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8631 8632 // - There's a scope specifier that does not match any template 8633 // parameter lists, in which case we use some arbitrary context, 8634 // create a method or method template, and wait for instantiation. 8635 // - There's a scope specifier that does match some template 8636 // parameter lists, which we don't handle right now. 8637 } else { 8638 DC = CurContext; 8639 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8640 } 8641 8642 if (!DC->isRecord()) { 8643 // This implies that it has to be an operator or function. 8644 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8645 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8646 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8647 Diag(Loc, diag::err_introducing_special_friend) << 8648 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8649 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8650 return 0; 8651 } 8652 } 8653 8654 bool Redeclaration = false; 8655 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8656 move(TemplateParams), 8657 IsDefinition, 8658 Redeclaration); 8659 if (!ND) return 0; 8660 8661 assert(ND->getDeclContext() == DC); 8662 assert(ND->getLexicalDeclContext() == CurContext); 8663 8664 // Add the function declaration to the appropriate lookup tables, 8665 // adjusting the redeclarations list as necessary. We don't 8666 // want to do this yet if the friending class is dependent. 8667 // 8668 // Also update the scope-based lookup if the target context's 8669 // lookup context is in lexical scope. 8670 if (!CurContext->isDependentContext()) { 8671 DC = DC->getRedeclContext(); 8672 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8673 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8674 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8675 } 8676 8677 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8678 D.getIdentifierLoc(), ND, 8679 DS.getFriendSpecLoc()); 8680 FrD->setAccess(AS_public); 8681 CurContext->addDecl(FrD); 8682 8683 if (ND->isInvalidDecl()) 8684 FrD->setInvalidDecl(); 8685 else { 8686 FunctionDecl *FD; 8687 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8688 FD = FTD->getTemplatedDecl(); 8689 else 8690 FD = cast<FunctionDecl>(ND); 8691 8692 // Mark templated-scope function declarations as unsupported. 8693 if (FD->getNumTemplateParameterLists()) 8694 FrD->setUnsupportedFriend(true); 8695 } 8696 8697 return ND; 8698} 8699 8700void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8701 AdjustDeclIfTemplate(Dcl); 8702 8703 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8704 if (!Fn) { 8705 Diag(DelLoc, diag::err_deleted_non_function); 8706 return; 8707 } 8708 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8709 Diag(DelLoc, diag::err_deleted_decl_not_first); 8710 Diag(Prev->getLocation(), diag::note_previous_declaration); 8711 // If the declaration wasn't the first, we delete the function anyway for 8712 // recovery. 8713 } 8714 Fn->setDeletedAsWritten(); 8715} 8716 8717void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8718 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8719 8720 if (MD) { 8721 if (MD->getParent()->isDependentType()) { 8722 MD->setDefaulted(); 8723 MD->setExplicitlyDefaulted(); 8724 return; 8725 } 8726 8727 CXXSpecialMember Member = getSpecialMember(MD); 8728 if (Member == CXXInvalid) { 8729 Diag(DefaultLoc, diag::err_default_special_members); 8730 return; 8731 } 8732 8733 MD->setDefaulted(); 8734 MD->setExplicitlyDefaulted(); 8735 8736 // If this definition appears within the record, do the checking when 8737 // the record is complete. 8738 const FunctionDecl *Primary = MD; 8739 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8740 // Find the uninstantiated declaration that actually had the '= default' 8741 // on it. 8742 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8743 8744 if (Primary == Primary->getCanonicalDecl()) 8745 return; 8746 8747 switch (Member) { 8748 case CXXDefaultConstructor: { 8749 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8750 CheckExplicitlyDefaultedDefaultConstructor(CD); 8751 if (!CD->isInvalidDecl()) 8752 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8753 break; 8754 } 8755 8756 case CXXCopyConstructor: { 8757 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8758 CheckExplicitlyDefaultedCopyConstructor(CD); 8759 if (!CD->isInvalidDecl()) 8760 DefineImplicitCopyConstructor(DefaultLoc, CD); 8761 break; 8762 } 8763 8764 case CXXCopyAssignment: { 8765 CheckExplicitlyDefaultedCopyAssignment(MD); 8766 if (!MD->isInvalidDecl()) 8767 DefineImplicitCopyAssignment(DefaultLoc, MD); 8768 break; 8769 } 8770 8771 case CXXDestructor: { 8772 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8773 CheckExplicitlyDefaultedDestructor(DD); 8774 if (!DD->isInvalidDecl()) 8775 DefineImplicitDestructor(DefaultLoc, DD); 8776 break; 8777 } 8778 8779 case CXXMoveConstructor: 8780 case CXXMoveAssignment: 8781 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8782 break; 8783 8784 default: 8785 // FIXME: Do the rest once we have move functions 8786 break; 8787 } 8788 } else { 8789 Diag(DefaultLoc, diag::err_default_special_members); 8790 } 8791} 8792 8793static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8794 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8795 Stmt *SubStmt = *CI; 8796 if (!SubStmt) 8797 continue; 8798 if (isa<ReturnStmt>(SubStmt)) 8799 Self.Diag(SubStmt->getSourceRange().getBegin(), 8800 diag::err_return_in_constructor_handler); 8801 if (!isa<Expr>(SubStmt)) 8802 SearchForReturnInStmt(Self, SubStmt); 8803 } 8804} 8805 8806void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8807 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8808 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8809 SearchForReturnInStmt(*this, Handler); 8810 } 8811} 8812 8813bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8814 const CXXMethodDecl *Old) { 8815 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8816 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8817 8818 if (Context.hasSameType(NewTy, OldTy) || 8819 NewTy->isDependentType() || OldTy->isDependentType()) 8820 return false; 8821 8822 // Check if the return types are covariant 8823 QualType NewClassTy, OldClassTy; 8824 8825 /// Both types must be pointers or references to classes. 8826 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8827 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8828 NewClassTy = NewPT->getPointeeType(); 8829 OldClassTy = OldPT->getPointeeType(); 8830 } 8831 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8832 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8833 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8834 NewClassTy = NewRT->getPointeeType(); 8835 OldClassTy = OldRT->getPointeeType(); 8836 } 8837 } 8838 } 8839 8840 // The return types aren't either both pointers or references to a class type. 8841 if (NewClassTy.isNull()) { 8842 Diag(New->getLocation(), 8843 diag::err_different_return_type_for_overriding_virtual_function) 8844 << New->getDeclName() << NewTy << OldTy; 8845 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8846 8847 return true; 8848 } 8849 8850 // C++ [class.virtual]p6: 8851 // If the return type of D::f differs from the return type of B::f, the 8852 // class type in the return type of D::f shall be complete at the point of 8853 // declaration of D::f or shall be the class type D. 8854 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8855 if (!RT->isBeingDefined() && 8856 RequireCompleteType(New->getLocation(), NewClassTy, 8857 PDiag(diag::err_covariant_return_incomplete) 8858 << New->getDeclName())) 8859 return true; 8860 } 8861 8862 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8863 // Check if the new class derives from the old class. 8864 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8865 Diag(New->getLocation(), 8866 diag::err_covariant_return_not_derived) 8867 << New->getDeclName() << NewTy << OldTy; 8868 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8869 return true; 8870 } 8871 8872 // Check if we the conversion from derived to base is valid. 8873 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8874 diag::err_covariant_return_inaccessible_base, 8875 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8876 // FIXME: Should this point to the return type? 8877 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8878 // FIXME: this note won't trigger for delayed access control 8879 // diagnostics, and it's impossible to get an undelayed error 8880 // here from access control during the original parse because 8881 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8882 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8883 return true; 8884 } 8885 } 8886 8887 // The qualifiers of the return types must be the same. 8888 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8889 Diag(New->getLocation(), 8890 diag::err_covariant_return_type_different_qualifications) 8891 << New->getDeclName() << NewTy << OldTy; 8892 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8893 return true; 8894 }; 8895 8896 8897 // The new class type must have the same or less qualifiers as the old type. 8898 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8899 Diag(New->getLocation(), 8900 diag::err_covariant_return_type_class_type_more_qualified) 8901 << New->getDeclName() << NewTy << OldTy; 8902 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8903 return true; 8904 }; 8905 8906 return false; 8907} 8908 8909/// \brief Mark the given method pure. 8910/// 8911/// \param Method the method to be marked pure. 8912/// 8913/// \param InitRange the source range that covers the "0" initializer. 8914bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8915 SourceLocation EndLoc = InitRange.getEnd(); 8916 if (EndLoc.isValid()) 8917 Method->setRangeEnd(EndLoc); 8918 8919 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8920 Method->setPure(); 8921 return false; 8922 } 8923 8924 if (!Method->isInvalidDecl()) 8925 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8926 << Method->getDeclName() << InitRange; 8927 return true; 8928} 8929 8930/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8931/// an initializer for the out-of-line declaration 'Dcl'. The scope 8932/// is a fresh scope pushed for just this purpose. 8933/// 8934/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8935/// static data member of class X, names should be looked up in the scope of 8936/// class X. 8937void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8938 // If there is no declaration, there was an error parsing it. 8939 if (D == 0 || D->isInvalidDecl()) return; 8940 8941 // We should only get called for declarations with scope specifiers, like: 8942 // int foo::bar; 8943 assert(D->isOutOfLine()); 8944 EnterDeclaratorContext(S, D->getDeclContext()); 8945} 8946 8947/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8948/// initializer for the out-of-line declaration 'D'. 8949void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8950 // If there is no declaration, there was an error parsing it. 8951 if (D == 0 || D->isInvalidDecl()) return; 8952 8953 assert(D->isOutOfLine()); 8954 ExitDeclaratorContext(S); 8955} 8956 8957/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8958/// C++ if/switch/while/for statement. 8959/// e.g: "if (int x = f()) {...}" 8960DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8961 // C++ 6.4p2: 8962 // The declarator shall not specify a function or an array. 8963 // The type-specifier-seq shall not contain typedef and shall not declare a 8964 // new class or enumeration. 8965 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8966 "Parser allowed 'typedef' as storage class of condition decl."); 8967 8968 Decl *Dcl = ActOnDeclarator(S, D); 8969 if (!Dcl) 8970 return true; 8971 8972 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 8973 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 8974 << D.getSourceRange(); 8975 return true; 8976 } 8977 8978 return Dcl; 8979} 8980 8981void Sema::LoadExternalVTableUses() { 8982 if (!ExternalSource) 8983 return; 8984 8985 SmallVector<ExternalVTableUse, 4> VTables; 8986 ExternalSource->ReadUsedVTables(VTables); 8987 SmallVector<VTableUse, 4> NewUses; 8988 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 8989 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 8990 = VTablesUsed.find(VTables[I].Record); 8991 // Even if a definition wasn't required before, it may be required now. 8992 if (Pos != VTablesUsed.end()) { 8993 if (!Pos->second && VTables[I].DefinitionRequired) 8994 Pos->second = true; 8995 continue; 8996 } 8997 8998 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 8999 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 9000 } 9001 9002 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 9003} 9004 9005void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 9006 bool DefinitionRequired) { 9007 // Ignore any vtable uses in unevaluated operands or for classes that do 9008 // not have a vtable. 9009 if (!Class->isDynamicClass() || Class->isDependentContext() || 9010 CurContext->isDependentContext() || 9011 ExprEvalContexts.back().Context == Unevaluated) 9012 return; 9013 9014 // Try to insert this class into the map. 9015 LoadExternalVTableUses(); 9016 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9017 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 9018 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 9019 if (!Pos.second) { 9020 // If we already had an entry, check to see if we are promoting this vtable 9021 // to required a definition. If so, we need to reappend to the VTableUses 9022 // list, since we may have already processed the first entry. 9023 if (DefinitionRequired && !Pos.first->second) { 9024 Pos.first->second = true; 9025 } else { 9026 // Otherwise, we can early exit. 9027 return; 9028 } 9029 } 9030 9031 // Local classes need to have their virtual members marked 9032 // immediately. For all other classes, we mark their virtual members 9033 // at the end of the translation unit. 9034 if (Class->isLocalClass()) 9035 MarkVirtualMembersReferenced(Loc, Class); 9036 else 9037 VTableUses.push_back(std::make_pair(Class, Loc)); 9038} 9039 9040bool Sema::DefineUsedVTables() { 9041 LoadExternalVTableUses(); 9042 if (VTableUses.empty()) 9043 return false; 9044 9045 // Note: The VTableUses vector could grow as a result of marking 9046 // the members of a class as "used", so we check the size each 9047 // time through the loop and prefer indices (with are stable) to 9048 // iterators (which are not). 9049 bool DefinedAnything = false; 9050 for (unsigned I = 0; I != VTableUses.size(); ++I) { 9051 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 9052 if (!Class) 9053 continue; 9054 9055 SourceLocation Loc = VTableUses[I].second; 9056 9057 // If this class has a key function, but that key function is 9058 // defined in another translation unit, we don't need to emit the 9059 // vtable even though we're using it. 9060 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 9061 if (KeyFunction && !KeyFunction->hasBody()) { 9062 switch (KeyFunction->getTemplateSpecializationKind()) { 9063 case TSK_Undeclared: 9064 case TSK_ExplicitSpecialization: 9065 case TSK_ExplicitInstantiationDeclaration: 9066 // The key function is in another translation unit. 9067 continue; 9068 9069 case TSK_ExplicitInstantiationDefinition: 9070 case TSK_ImplicitInstantiation: 9071 // We will be instantiating the key function. 9072 break; 9073 } 9074 } else if (!KeyFunction) { 9075 // If we have a class with no key function that is the subject 9076 // of an explicit instantiation declaration, suppress the 9077 // vtable; it will live with the explicit instantiation 9078 // definition. 9079 bool IsExplicitInstantiationDeclaration 9080 = Class->getTemplateSpecializationKind() 9081 == TSK_ExplicitInstantiationDeclaration; 9082 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9083 REnd = Class->redecls_end(); 9084 R != REnd; ++R) { 9085 TemplateSpecializationKind TSK 9086 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9087 if (TSK == TSK_ExplicitInstantiationDeclaration) 9088 IsExplicitInstantiationDeclaration = true; 9089 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9090 IsExplicitInstantiationDeclaration = false; 9091 break; 9092 } 9093 } 9094 9095 if (IsExplicitInstantiationDeclaration) 9096 continue; 9097 } 9098 9099 // Mark all of the virtual members of this class as referenced, so 9100 // that we can build a vtable. Then, tell the AST consumer that a 9101 // vtable for this class is required. 9102 DefinedAnything = true; 9103 MarkVirtualMembersReferenced(Loc, Class); 9104 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9105 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9106 9107 // Optionally warn if we're emitting a weak vtable. 9108 if (Class->getLinkage() == ExternalLinkage && 9109 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9110 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9111 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9112 } 9113 } 9114 VTableUses.clear(); 9115 9116 return DefinedAnything; 9117} 9118 9119void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9120 const CXXRecordDecl *RD) { 9121 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9122 e = RD->method_end(); i != e; ++i) { 9123 CXXMethodDecl *MD = *i; 9124 9125 // C++ [basic.def.odr]p2: 9126 // [...] A virtual member function is used if it is not pure. [...] 9127 if (MD->isVirtual() && !MD->isPure()) 9128 MarkDeclarationReferenced(Loc, MD); 9129 } 9130 9131 // Only classes that have virtual bases need a VTT. 9132 if (RD->getNumVBases() == 0) 9133 return; 9134 9135 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9136 e = RD->bases_end(); i != e; ++i) { 9137 const CXXRecordDecl *Base = 9138 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9139 if (Base->getNumVBases() == 0) 9140 continue; 9141 MarkVirtualMembersReferenced(Loc, Base); 9142 } 9143} 9144 9145/// SetIvarInitializers - This routine builds initialization ASTs for the 9146/// Objective-C implementation whose ivars need be initialized. 9147void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9148 if (!getLangOptions().CPlusPlus) 9149 return; 9150 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9151 SmallVector<ObjCIvarDecl*, 8> ivars; 9152 CollectIvarsToConstructOrDestruct(OID, ivars); 9153 if (ivars.empty()) 9154 return; 9155 SmallVector<CXXCtorInitializer*, 32> AllToInit; 9156 for (unsigned i = 0; i < ivars.size(); i++) { 9157 FieldDecl *Field = ivars[i]; 9158 if (Field->isInvalidDecl()) 9159 continue; 9160 9161 CXXCtorInitializer *Member; 9162 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9163 InitializationKind InitKind = 9164 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9165 9166 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9167 ExprResult MemberInit = 9168 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9169 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9170 // Note, MemberInit could actually come back empty if no initialization 9171 // is required (e.g., because it would call a trivial default constructor) 9172 if (!MemberInit.get() || MemberInit.isInvalid()) 9173 continue; 9174 9175 Member = 9176 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9177 SourceLocation(), 9178 MemberInit.takeAs<Expr>(), 9179 SourceLocation()); 9180 AllToInit.push_back(Member); 9181 9182 // Be sure that the destructor is accessible and is marked as referenced. 9183 if (const RecordType *RecordTy 9184 = Context.getBaseElementType(Field->getType()) 9185 ->getAs<RecordType>()) { 9186 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9187 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9188 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9189 CheckDestructorAccess(Field->getLocation(), Destructor, 9190 PDiag(diag::err_access_dtor_ivar) 9191 << Context.getBaseElementType(Field->getType())); 9192 } 9193 } 9194 } 9195 ObjCImplementation->setIvarInitializers(Context, 9196 AllToInit.data(), AllToInit.size()); 9197 } 9198} 9199 9200static 9201void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9202 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9203 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9204 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9205 Sema &S) { 9206 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9207 CE = Current.end(); 9208 if (Ctor->isInvalidDecl()) 9209 return; 9210 9211 const FunctionDecl *FNTarget = 0; 9212 CXXConstructorDecl *Target; 9213 9214 // We ignore the result here since if we don't have a body, Target will be 9215 // null below. 9216 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9217 Target 9218= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9219 9220 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9221 // Avoid dereferencing a null pointer here. 9222 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9223 9224 if (!Current.insert(Canonical)) 9225 return; 9226 9227 // We know that beyond here, we aren't chaining into a cycle. 9228 if (!Target || !Target->isDelegatingConstructor() || 9229 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9230 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9231 Valid.insert(*CI); 9232 Current.clear(); 9233 // We've hit a cycle. 9234 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9235 Current.count(TCanonical)) { 9236 // If we haven't diagnosed this cycle yet, do so now. 9237 if (!Invalid.count(TCanonical)) { 9238 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9239 diag::warn_delegating_ctor_cycle) 9240 << Ctor; 9241 9242 // Don't add a note for a function delegating directo to itself. 9243 if (TCanonical != Canonical) 9244 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9245 9246 CXXConstructorDecl *C = Target; 9247 while (C->getCanonicalDecl() != Canonical) { 9248 (void)C->getTargetConstructor()->hasBody(FNTarget); 9249 assert(FNTarget && "Ctor cycle through bodiless function"); 9250 9251 C 9252 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9253 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9254 } 9255 } 9256 9257 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9258 Invalid.insert(*CI); 9259 Current.clear(); 9260 } else { 9261 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9262 } 9263} 9264 9265 9266void Sema::CheckDelegatingCtorCycles() { 9267 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9268 9269 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9270 CE = Current.end(); 9271 9272 for (DelegatingCtorDeclsType::iterator 9273 I = DelegatingCtorDecls.begin(ExternalSource), 9274 E = DelegatingCtorDecls.end(); 9275 I != E; ++I) { 9276 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9277 } 9278 9279 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9280 (*CI)->setInvalidDecl(); 9281} 9282