SemaDeclCXX.cpp revision 7a614d8380297fcd2bc23986241905d97222948c
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 (!Class->hasObjectMember()) { 766 if (const RecordType *FDTTy = 767 NewBaseType.getTypePtr()->getAs<RecordType>()) 768 if (FDTTy->getDecl()->hasObjectMember()) 769 Class->setHasObjectMember(true); 770 } 771 772 if (KnownBaseTypes[NewBaseType]) { 773 // C++ [class.mi]p3: 774 // A class shall not be specified as a direct base class of a 775 // derived class more than once. 776 Diag(Bases[idx]->getSourceRange().getBegin(), 777 diag::err_duplicate_base_class) 778 << KnownBaseTypes[NewBaseType]->getType() 779 << Bases[idx]->getSourceRange(); 780 781 // Delete the duplicate base class specifier; we're going to 782 // overwrite its pointer later. 783 Context.Deallocate(Bases[idx]); 784 785 Invalid = true; 786 } else { 787 // Okay, add this new base class. 788 KnownBaseTypes[NewBaseType] = Bases[idx]; 789 Bases[NumGoodBases++] = Bases[idx]; 790 } 791 } 792 793 // Attach the remaining base class specifiers to the derived class. 794 Class->setBases(Bases, NumGoodBases); 795 796 // Delete the remaining (good) base class specifiers, since their 797 // data has been copied into the CXXRecordDecl. 798 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 799 Context.Deallocate(Bases[idx]); 800 801 return Invalid; 802} 803 804/// ActOnBaseSpecifiers - Attach the given base specifiers to the 805/// class, after checking whether there are any duplicate base 806/// classes. 807void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 808 unsigned NumBases) { 809 if (!ClassDecl || !Bases || !NumBases) 810 return; 811 812 AdjustDeclIfTemplate(ClassDecl); 813 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 814 (CXXBaseSpecifier**)(Bases), NumBases); 815} 816 817static CXXRecordDecl *GetClassForType(QualType T) { 818 if (const RecordType *RT = T->getAs<RecordType>()) 819 return cast<CXXRecordDecl>(RT->getDecl()); 820 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 821 return ICT->getDecl(); 822 else 823 return 0; 824} 825 826/// \brief Determine whether the type \p Derived is a C++ class that is 827/// derived from the type \p Base. 828bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 829 if (!getLangOptions().CPlusPlus) 830 return false; 831 832 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 833 if (!DerivedRD) 834 return false; 835 836 CXXRecordDecl *BaseRD = GetClassForType(Base); 837 if (!BaseRD) 838 return false; 839 840 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 841 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 842} 843 844/// \brief Determine whether the type \p Derived is a C++ class that is 845/// derived from the type \p Base. 846bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 847 if (!getLangOptions().CPlusPlus) 848 return false; 849 850 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 851 if (!DerivedRD) 852 return false; 853 854 CXXRecordDecl *BaseRD = GetClassForType(Base); 855 if (!BaseRD) 856 return false; 857 858 return DerivedRD->isDerivedFrom(BaseRD, Paths); 859} 860 861void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 862 CXXCastPath &BasePathArray) { 863 assert(BasePathArray.empty() && "Base path array must be empty!"); 864 assert(Paths.isRecordingPaths() && "Must record paths!"); 865 866 const CXXBasePath &Path = Paths.front(); 867 868 // We first go backward and check if we have a virtual base. 869 // FIXME: It would be better if CXXBasePath had the base specifier for 870 // the nearest virtual base. 871 unsigned Start = 0; 872 for (unsigned I = Path.size(); I != 0; --I) { 873 if (Path[I - 1].Base->isVirtual()) { 874 Start = I - 1; 875 break; 876 } 877 } 878 879 // Now add all bases. 880 for (unsigned I = Start, E = Path.size(); I != E; ++I) 881 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 882} 883 884/// \brief Determine whether the given base path includes a virtual 885/// base class. 886bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 887 for (CXXCastPath::const_iterator B = BasePath.begin(), 888 BEnd = BasePath.end(); 889 B != BEnd; ++B) 890 if ((*B)->isVirtual()) 891 return true; 892 893 return false; 894} 895 896/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 897/// conversion (where Derived and Base are class types) is 898/// well-formed, meaning that the conversion is unambiguous (and 899/// that all of the base classes are accessible). Returns true 900/// and emits a diagnostic if the code is ill-formed, returns false 901/// otherwise. Loc is the location where this routine should point to 902/// if there is an error, and Range is the source range to highlight 903/// if there is an error. 904bool 905Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 906 unsigned InaccessibleBaseID, 907 unsigned AmbigiousBaseConvID, 908 SourceLocation Loc, SourceRange Range, 909 DeclarationName Name, 910 CXXCastPath *BasePath) { 911 // First, determine whether the path from Derived to Base is 912 // ambiguous. This is slightly more expensive than checking whether 913 // the Derived to Base conversion exists, because here we need to 914 // explore multiple paths to determine if there is an ambiguity. 915 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 916 /*DetectVirtual=*/false); 917 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 918 assert(DerivationOkay && 919 "Can only be used with a derived-to-base conversion"); 920 (void)DerivationOkay; 921 922 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 923 if (InaccessibleBaseID) { 924 // Check that the base class can be accessed. 925 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 926 InaccessibleBaseID)) { 927 case AR_inaccessible: 928 return true; 929 case AR_accessible: 930 case AR_dependent: 931 case AR_delayed: 932 break; 933 } 934 } 935 936 // Build a base path if necessary. 937 if (BasePath) 938 BuildBasePathArray(Paths, *BasePath); 939 return false; 940 } 941 942 // We know that the derived-to-base conversion is ambiguous, and 943 // we're going to produce a diagnostic. Perform the derived-to-base 944 // search just one more time to compute all of the possible paths so 945 // that we can print them out. This is more expensive than any of 946 // the previous derived-to-base checks we've done, but at this point 947 // performance isn't as much of an issue. 948 Paths.clear(); 949 Paths.setRecordingPaths(true); 950 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 951 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 952 (void)StillOkay; 953 954 // Build up a textual representation of the ambiguous paths, e.g., 955 // D -> B -> A, that will be used to illustrate the ambiguous 956 // conversions in the diagnostic. We only print one of the paths 957 // to each base class subobject. 958 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 959 960 Diag(Loc, AmbigiousBaseConvID) 961 << Derived << Base << PathDisplayStr << Range << Name; 962 return true; 963} 964 965bool 966Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 967 SourceLocation Loc, SourceRange Range, 968 CXXCastPath *BasePath, 969 bool IgnoreAccess) { 970 return CheckDerivedToBaseConversion(Derived, Base, 971 IgnoreAccess ? 0 972 : diag::err_upcast_to_inaccessible_base, 973 diag::err_ambiguous_derived_to_base_conv, 974 Loc, Range, DeclarationName(), 975 BasePath); 976} 977 978 979/// @brief Builds a string representing ambiguous paths from a 980/// specific derived class to different subobjects of the same base 981/// class. 982/// 983/// This function builds a string that can be used in error messages 984/// to show the different paths that one can take through the 985/// inheritance hierarchy to go from the derived class to different 986/// subobjects of a base class. The result looks something like this: 987/// @code 988/// struct D -> struct B -> struct A 989/// struct D -> struct C -> struct A 990/// @endcode 991std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 992 std::string PathDisplayStr; 993 std::set<unsigned> DisplayedPaths; 994 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 995 Path != Paths.end(); ++Path) { 996 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 997 // We haven't displayed a path to this particular base 998 // class subobject yet. 999 PathDisplayStr += "\n "; 1000 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1001 for (CXXBasePath::const_iterator Element = Path->begin(); 1002 Element != Path->end(); ++Element) 1003 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1004 } 1005 } 1006 1007 return PathDisplayStr; 1008} 1009 1010//===----------------------------------------------------------------------===// 1011// C++ class member Handling 1012//===----------------------------------------------------------------------===// 1013 1014/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1015Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1016 SourceLocation ASLoc, 1017 SourceLocation ColonLoc) { 1018 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1019 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1020 ASLoc, ColonLoc); 1021 CurContext->addHiddenDecl(ASDecl); 1022 return ASDecl; 1023} 1024 1025/// CheckOverrideControl - Check C++0x override control semantics. 1026void Sema::CheckOverrideControl(const Decl *D) { 1027 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 1028 if (!MD || !MD->isVirtual()) 1029 return; 1030 1031 if (MD->isDependentContext()) 1032 return; 1033 1034 // C++0x [class.virtual]p3: 1035 // If a virtual function is marked with the virt-specifier override and does 1036 // not override a member function of a base class, 1037 // the program is ill-formed. 1038 bool HasOverriddenMethods = 1039 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1040 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1041 Diag(MD->getLocation(), 1042 diag::err_function_marked_override_not_overriding) 1043 << MD->getDeclName(); 1044 return; 1045 } 1046} 1047 1048/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1049/// function overrides a virtual member function marked 'final', according to 1050/// C++0x [class.virtual]p3. 1051bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1052 const CXXMethodDecl *Old) { 1053 if (!Old->hasAttr<FinalAttr>()) 1054 return false; 1055 1056 Diag(New->getLocation(), diag::err_final_function_overridden) 1057 << New->getDeclName(); 1058 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1059 return true; 1060} 1061 1062/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1063/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1064/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1065/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1066/// present but parsing it has been deferred. 1067Decl * 1068Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1069 MultiTemplateParamsArg TemplateParameterLists, 1070 ExprTy *BW, const VirtSpecifiers &VS, 1071 ExprTy *InitExpr, bool HasDeferredInit, 1072 bool IsDefinition) { 1073 const DeclSpec &DS = D.getDeclSpec(); 1074 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1075 DeclarationName Name = NameInfo.getName(); 1076 SourceLocation Loc = NameInfo.getLoc(); 1077 1078 // For anonymous bitfields, the location should point to the type. 1079 if (Loc.isInvalid()) 1080 Loc = D.getSourceRange().getBegin(); 1081 1082 Expr *BitWidth = static_cast<Expr*>(BW); 1083 Expr *Init = static_cast<Expr*>(InitExpr); 1084 1085 assert(isa<CXXRecordDecl>(CurContext)); 1086 assert(!DS.isFriendSpecified()); 1087 assert(!Init || !HasDeferredInit); 1088 1089 bool isFunc = false; 1090 if (D.isFunctionDeclarator()) 1091 isFunc = true; 1092 else if (D.getNumTypeObjects() == 0 && 1093 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1094 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1095 isFunc = TDType->isFunctionType(); 1096 } 1097 1098 // C++ 9.2p6: A member shall not be declared to have automatic storage 1099 // duration (auto, register) or with the extern storage-class-specifier. 1100 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1101 // data members and cannot be applied to names declared const or static, 1102 // and cannot be applied to reference members. 1103 switch (DS.getStorageClassSpec()) { 1104 case DeclSpec::SCS_unspecified: 1105 case DeclSpec::SCS_typedef: 1106 case DeclSpec::SCS_static: 1107 // FALL THROUGH. 1108 break; 1109 case DeclSpec::SCS_mutable: 1110 if (isFunc) { 1111 if (DS.getStorageClassSpecLoc().isValid()) 1112 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1113 else 1114 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1115 1116 // FIXME: It would be nicer if the keyword was ignored only for this 1117 // declarator. Otherwise we could get follow-up errors. 1118 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1119 } 1120 break; 1121 default: 1122 if (DS.getStorageClassSpecLoc().isValid()) 1123 Diag(DS.getStorageClassSpecLoc(), 1124 diag::err_storageclass_invalid_for_member); 1125 else 1126 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1127 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1128 } 1129 1130 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1131 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1132 !isFunc); 1133 1134 Decl *Member; 1135 if (isInstField) { 1136 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1137 1138 if (SS.isSet() && !SS.isInvalid()) { 1139 // The user provided a superfluous scope specifier inside a class 1140 // definition: 1141 // 1142 // class X { 1143 // int X::member; 1144 // }; 1145 DeclContext *DC = 0; 1146 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1147 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1148 << Name << FixItHint::CreateRemoval(SS.getRange()); 1149 else 1150 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1151 << Name << SS.getRange(); 1152 1153 SS.clear(); 1154 } 1155 1156 // FIXME: Check for template parameters! 1157 // FIXME: Check that the name is an identifier! 1158 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1159 HasDeferredInit, AS); 1160 assert(Member && "HandleField never returns null"); 1161 } else { 1162 assert(!HasDeferredInit); 1163 1164 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1165 if (!Member) { 1166 return 0; 1167 } 1168 1169 // Non-instance-fields can't have a bitfield. 1170 if (BitWidth) { 1171 if (Member->isInvalidDecl()) { 1172 // don't emit another diagnostic. 1173 } else if (isa<VarDecl>(Member)) { 1174 // C++ 9.6p3: A bit-field shall not be a static member. 1175 // "static member 'A' cannot be a bit-field" 1176 Diag(Loc, diag::err_static_not_bitfield) 1177 << Name << BitWidth->getSourceRange(); 1178 } else if (isa<TypedefDecl>(Member)) { 1179 // "typedef member 'x' cannot be a bit-field" 1180 Diag(Loc, diag::err_typedef_not_bitfield) 1181 << Name << BitWidth->getSourceRange(); 1182 } else { 1183 // A function typedef ("typedef int f(); f a;"). 1184 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1185 Diag(Loc, diag::err_not_integral_type_bitfield) 1186 << Name << cast<ValueDecl>(Member)->getType() 1187 << BitWidth->getSourceRange(); 1188 } 1189 1190 BitWidth = 0; 1191 Member->setInvalidDecl(); 1192 } 1193 1194 Member->setAccess(AS); 1195 1196 // If we have declared a member function template, set the access of the 1197 // templated declaration as well. 1198 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1199 FunTmpl->getTemplatedDecl()->setAccess(AS); 1200 } 1201 1202 if (VS.isOverrideSpecified()) { 1203 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1204 if (!MD || !MD->isVirtual()) { 1205 Diag(Member->getLocStart(), 1206 diag::override_keyword_only_allowed_on_virtual_member_functions) 1207 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1208 } else 1209 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1210 } 1211 if (VS.isFinalSpecified()) { 1212 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1213 if (!MD || !MD->isVirtual()) { 1214 Diag(Member->getLocStart(), 1215 diag::override_keyword_only_allowed_on_virtual_member_functions) 1216 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1217 } else 1218 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1219 } 1220 1221 if (VS.getLastLocation().isValid()) { 1222 // Update the end location of a method that has a virt-specifiers. 1223 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1224 MD->setRangeEnd(VS.getLastLocation()); 1225 } 1226 1227 CheckOverrideControl(Member); 1228 1229 assert((Name || isInstField) && "No identifier for non-field ?"); 1230 1231 if (Init) 1232 AddInitializerToDecl(Member, Init, false, 1233 DS.getTypeSpecType() == DeclSpec::TST_auto); 1234 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1235 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1236 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1237 // data member if a brace-or-equal-initializer is provided. 1238 Diag(Loc, diag::err_auto_var_requires_init) 1239 << Name << cast<ValueDecl>(Member)->getType(); 1240 Member->setInvalidDecl(); 1241 } 1242 1243 FinalizeDeclaration(Member); 1244 1245 if (isInstField) 1246 FieldCollector->Add(cast<FieldDecl>(Member)); 1247 return Member; 1248} 1249 1250/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1251/// in-class initializer for a non-static C++ class member. Such parsing 1252/// is deferred until the class is complete. 1253void 1254Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1255 Expr *InitExpr) { 1256 FieldDecl *FD = cast<FieldDecl>(D); 1257 1258 if (!InitExpr) { 1259 FD->setInvalidDecl(); 1260 FD->removeInClassInitializer(); 1261 return; 1262 } 1263 1264 ExprResult Init = InitExpr; 1265 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1266 // FIXME: if there is no EqualLoc, this is list-initialization. 1267 Init = PerformCopyInitialization( 1268 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1269 if (Init.isInvalid()) { 1270 FD->setInvalidDecl(); 1271 return; 1272 } 1273 1274 CheckImplicitConversions(Init.get(), EqualLoc); 1275 } 1276 1277 // C++0x [class.base.init]p7: 1278 // The initialization of each base and member constitutes a 1279 // full-expression. 1280 Init = MaybeCreateExprWithCleanups(Init); 1281 if (Init.isInvalid()) { 1282 FD->setInvalidDecl(); 1283 return; 1284 } 1285 1286 InitExpr = Init.release(); 1287 1288 FD->setInClassInitializer(InitExpr); 1289} 1290 1291/// \brief Find the direct and/or virtual base specifiers that 1292/// correspond to the given base type, for use in base initialization 1293/// within a constructor. 1294static bool FindBaseInitializer(Sema &SemaRef, 1295 CXXRecordDecl *ClassDecl, 1296 QualType BaseType, 1297 const CXXBaseSpecifier *&DirectBaseSpec, 1298 const CXXBaseSpecifier *&VirtualBaseSpec) { 1299 // First, check for a direct base class. 1300 DirectBaseSpec = 0; 1301 for (CXXRecordDecl::base_class_const_iterator Base 1302 = ClassDecl->bases_begin(); 1303 Base != ClassDecl->bases_end(); ++Base) { 1304 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1305 // We found a direct base of this type. That's what we're 1306 // initializing. 1307 DirectBaseSpec = &*Base; 1308 break; 1309 } 1310 } 1311 1312 // Check for a virtual base class. 1313 // FIXME: We might be able to short-circuit this if we know in advance that 1314 // there are no virtual bases. 1315 VirtualBaseSpec = 0; 1316 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1317 // We haven't found a base yet; search the class hierarchy for a 1318 // virtual base class. 1319 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1320 /*DetectVirtual=*/false); 1321 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1322 BaseType, Paths)) { 1323 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1324 Path != Paths.end(); ++Path) { 1325 if (Path->back().Base->isVirtual()) { 1326 VirtualBaseSpec = Path->back().Base; 1327 break; 1328 } 1329 } 1330 } 1331 } 1332 1333 return DirectBaseSpec || VirtualBaseSpec; 1334} 1335 1336/// ActOnMemInitializer - Handle a C++ member initializer. 1337MemInitResult 1338Sema::ActOnMemInitializer(Decl *ConstructorD, 1339 Scope *S, 1340 CXXScopeSpec &SS, 1341 IdentifierInfo *MemberOrBase, 1342 ParsedType TemplateTypeTy, 1343 SourceLocation IdLoc, 1344 SourceLocation LParenLoc, 1345 ExprTy **Args, unsigned NumArgs, 1346 SourceLocation RParenLoc, 1347 SourceLocation EllipsisLoc) { 1348 if (!ConstructorD) 1349 return true; 1350 1351 AdjustDeclIfTemplate(ConstructorD); 1352 1353 CXXConstructorDecl *Constructor 1354 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1355 if (!Constructor) { 1356 // The user wrote a constructor initializer on a function that is 1357 // not a C++ constructor. Ignore the error for now, because we may 1358 // have more member initializers coming; we'll diagnose it just 1359 // once in ActOnMemInitializers. 1360 return true; 1361 } 1362 1363 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1364 1365 // C++ [class.base.init]p2: 1366 // Names in a mem-initializer-id are looked up in the scope of the 1367 // constructor's class and, if not found in that scope, are looked 1368 // up in the scope containing the constructor's definition. 1369 // [Note: if the constructor's class contains a member with the 1370 // same name as a direct or virtual base class of the class, a 1371 // mem-initializer-id naming the member or base class and composed 1372 // of a single identifier refers to the class member. A 1373 // mem-initializer-id for the hidden base class may be specified 1374 // using a qualified name. ] 1375 if (!SS.getScopeRep() && !TemplateTypeTy) { 1376 // Look for a member, first. 1377 FieldDecl *Member = 0; 1378 DeclContext::lookup_result Result 1379 = ClassDecl->lookup(MemberOrBase); 1380 if (Result.first != Result.second) { 1381 Member = dyn_cast<FieldDecl>(*Result.first); 1382 1383 if (Member) { 1384 if (EllipsisLoc.isValid()) 1385 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1386 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1387 1388 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1389 LParenLoc, RParenLoc); 1390 } 1391 1392 // Handle anonymous union case. 1393 if (IndirectFieldDecl* IndirectField 1394 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1395 if (EllipsisLoc.isValid()) 1396 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1397 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1398 1399 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1400 NumArgs, IdLoc, 1401 LParenLoc, RParenLoc); 1402 } 1403 } 1404 } 1405 // It didn't name a member, so see if it names a class. 1406 QualType BaseType; 1407 TypeSourceInfo *TInfo = 0; 1408 1409 if (TemplateTypeTy) { 1410 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1411 } else { 1412 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1413 LookupParsedName(R, S, &SS); 1414 1415 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1416 if (!TyD) { 1417 if (R.isAmbiguous()) return true; 1418 1419 // We don't want access-control diagnostics here. 1420 R.suppressDiagnostics(); 1421 1422 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1423 bool NotUnknownSpecialization = false; 1424 DeclContext *DC = computeDeclContext(SS, false); 1425 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1426 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1427 1428 if (!NotUnknownSpecialization) { 1429 // When the scope specifier can refer to a member of an unknown 1430 // specialization, we take it as a type name. 1431 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1432 SS.getWithLocInContext(Context), 1433 *MemberOrBase, IdLoc); 1434 if (BaseType.isNull()) 1435 return true; 1436 1437 R.clear(); 1438 R.setLookupName(MemberOrBase); 1439 } 1440 } 1441 1442 // If no results were found, try to correct typos. 1443 if (R.empty() && BaseType.isNull() && 1444 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1445 R.isSingleResult()) { 1446 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1447 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1448 // We have found a non-static data member with a similar 1449 // name to what was typed; complain and initialize that 1450 // member. 1451 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1452 << MemberOrBase << true << R.getLookupName() 1453 << FixItHint::CreateReplacement(R.getNameLoc(), 1454 R.getLookupName().getAsString()); 1455 Diag(Member->getLocation(), diag::note_previous_decl) 1456 << Member->getDeclName(); 1457 1458 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1459 LParenLoc, RParenLoc); 1460 } 1461 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1462 const CXXBaseSpecifier *DirectBaseSpec; 1463 const CXXBaseSpecifier *VirtualBaseSpec; 1464 if (FindBaseInitializer(*this, ClassDecl, 1465 Context.getTypeDeclType(Type), 1466 DirectBaseSpec, VirtualBaseSpec)) { 1467 // We have found a direct or virtual base class with a 1468 // similar name to what was typed; complain and initialize 1469 // that base class. 1470 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1471 << MemberOrBase << false << R.getLookupName() 1472 << FixItHint::CreateReplacement(R.getNameLoc(), 1473 R.getLookupName().getAsString()); 1474 1475 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1476 : VirtualBaseSpec; 1477 Diag(BaseSpec->getSourceRange().getBegin(), 1478 diag::note_base_class_specified_here) 1479 << BaseSpec->getType() 1480 << BaseSpec->getSourceRange(); 1481 1482 TyD = Type; 1483 } 1484 } 1485 } 1486 1487 if (!TyD && BaseType.isNull()) { 1488 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1489 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1490 return true; 1491 } 1492 } 1493 1494 if (BaseType.isNull()) { 1495 BaseType = Context.getTypeDeclType(TyD); 1496 if (SS.isSet()) { 1497 NestedNameSpecifier *Qualifier = 1498 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1499 1500 // FIXME: preserve source range information 1501 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1502 } 1503 } 1504 } 1505 1506 if (!TInfo) 1507 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1508 1509 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1510 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1511} 1512 1513/// Checks an initializer expression for use of uninitialized fields, such as 1514/// containing the field that is being initialized. Returns true if there is an 1515/// uninitialized field was used an updates the SourceLocation parameter; false 1516/// otherwise. 1517static bool InitExprContainsUninitializedFields(const Stmt *S, 1518 const ValueDecl *LhsField, 1519 SourceLocation *L) { 1520 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1521 1522 if (isa<CallExpr>(S)) { 1523 // Do not descend into function calls or constructors, as the use 1524 // of an uninitialized field may be valid. One would have to inspect 1525 // the contents of the function/ctor to determine if it is safe or not. 1526 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1527 // may be safe, depending on what the function/ctor does. 1528 return false; 1529 } 1530 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1531 const NamedDecl *RhsField = ME->getMemberDecl(); 1532 1533 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1534 // The member expression points to a static data member. 1535 assert(VD->isStaticDataMember() && 1536 "Member points to non-static data member!"); 1537 (void)VD; 1538 return false; 1539 } 1540 1541 if (isa<EnumConstantDecl>(RhsField)) { 1542 // The member expression points to an enum. 1543 return false; 1544 } 1545 1546 if (RhsField == LhsField) { 1547 // Initializing a field with itself. Throw a warning. 1548 // But wait; there are exceptions! 1549 // Exception #1: The field may not belong to this record. 1550 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1551 const Expr *base = ME->getBase(); 1552 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1553 // Even though the field matches, it does not belong to this record. 1554 return false; 1555 } 1556 // None of the exceptions triggered; return true to indicate an 1557 // uninitialized field was used. 1558 *L = ME->getMemberLoc(); 1559 return true; 1560 } 1561 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1562 // sizeof/alignof doesn't reference contents, do not warn. 1563 return false; 1564 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1565 // address-of doesn't reference contents (the pointer may be dereferenced 1566 // in the same expression but it would be rare; and weird). 1567 if (UOE->getOpcode() == UO_AddrOf) 1568 return false; 1569 } 1570 for (Stmt::const_child_range it = S->children(); it; ++it) { 1571 if (!*it) { 1572 // An expression such as 'member(arg ?: "")' may trigger this. 1573 continue; 1574 } 1575 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1576 return true; 1577 } 1578 return false; 1579} 1580 1581MemInitResult 1582Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1583 unsigned NumArgs, SourceLocation IdLoc, 1584 SourceLocation LParenLoc, 1585 SourceLocation RParenLoc) { 1586 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1587 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1588 assert((DirectMember || IndirectMember) && 1589 "Member must be a FieldDecl or IndirectFieldDecl"); 1590 1591 if (Member->isInvalidDecl()) 1592 return true; 1593 1594 // Diagnose value-uses of fields to initialize themselves, e.g. 1595 // foo(foo) 1596 // where foo is not also a parameter to the constructor. 1597 // TODO: implement -Wuninitialized and fold this into that framework. 1598 for (unsigned i = 0; i < NumArgs; ++i) { 1599 SourceLocation L; 1600 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1601 // FIXME: Return true in the case when other fields are used before being 1602 // uninitialized. For example, let this field be the i'th field. When 1603 // initializing the i'th field, throw a warning if any of the >= i'th 1604 // fields are used, as they are not yet initialized. 1605 // Right now we are only handling the case where the i'th field uses 1606 // itself in its initializer. 1607 Diag(L, diag::warn_field_is_uninit); 1608 } 1609 } 1610 1611 bool HasDependentArg = false; 1612 for (unsigned i = 0; i < NumArgs; i++) 1613 HasDependentArg |= Args[i]->isTypeDependent(); 1614 1615 Expr *Init; 1616 if (Member->getType()->isDependentType() || HasDependentArg) { 1617 // Can't check initialization for a member of dependent type or when 1618 // any of the arguments are type-dependent expressions. 1619 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1620 RParenLoc); 1621 1622 // Erase any temporaries within this evaluation context; we're not 1623 // going to track them in the AST, since we'll be rebuilding the 1624 // ASTs during template instantiation. 1625 ExprTemporaries.erase( 1626 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1627 ExprTemporaries.end()); 1628 } else { 1629 // Initialize the member. 1630 InitializedEntity MemberEntity = 1631 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1632 : InitializedEntity::InitializeMember(IndirectMember, 0); 1633 InitializationKind Kind = 1634 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1635 1636 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1637 1638 ExprResult MemberInit = 1639 InitSeq.Perform(*this, MemberEntity, Kind, 1640 MultiExprArg(*this, Args, NumArgs), 0); 1641 if (MemberInit.isInvalid()) 1642 return true; 1643 1644 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1645 1646 // C++0x [class.base.init]p7: 1647 // The initialization of each base and member constitutes a 1648 // full-expression. 1649 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1650 if (MemberInit.isInvalid()) 1651 return true; 1652 1653 // If we are in a dependent context, template instantiation will 1654 // perform this type-checking again. Just save the arguments that we 1655 // received in a ParenListExpr. 1656 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1657 // of the information that we have about the member 1658 // initializer. However, deconstructing the ASTs is a dicey process, 1659 // and this approach is far more likely to get the corner cases right. 1660 if (CurContext->isDependentContext()) 1661 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1662 RParenLoc); 1663 else 1664 Init = MemberInit.get(); 1665 } 1666 1667 if (DirectMember) { 1668 return new (Context) CXXCtorInitializer(Context, DirectMember, 1669 IdLoc, LParenLoc, Init, 1670 RParenLoc); 1671 } else { 1672 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1673 IdLoc, LParenLoc, Init, 1674 RParenLoc); 1675 } 1676} 1677 1678MemInitResult 1679Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1680 Expr **Args, unsigned NumArgs, 1681 SourceLocation NameLoc, 1682 SourceLocation LParenLoc, 1683 SourceLocation RParenLoc, 1684 CXXRecordDecl *ClassDecl) { 1685 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1686 if (!LangOpts.CPlusPlus0x) 1687 return Diag(Loc, diag::err_delegation_0x_only) 1688 << TInfo->getTypeLoc().getLocalSourceRange(); 1689 1690 // Initialize the object. 1691 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1692 QualType(ClassDecl->getTypeForDecl(), 0)); 1693 InitializationKind Kind = 1694 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1695 1696 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1697 1698 ExprResult DelegationInit = 1699 InitSeq.Perform(*this, DelegationEntity, Kind, 1700 MultiExprArg(*this, Args, NumArgs), 0); 1701 if (DelegationInit.isInvalid()) 1702 return true; 1703 1704 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1705 CXXConstructorDecl *Constructor 1706 = ConExpr->getConstructor(); 1707 assert(Constructor && "Delegating constructor with no target?"); 1708 1709 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1710 1711 // C++0x [class.base.init]p7: 1712 // The initialization of each base and member constitutes a 1713 // full-expression. 1714 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1715 if (DelegationInit.isInvalid()) 1716 return true; 1717 1718 // If we are in a dependent context, template instantiation will 1719 // perform this type-checking again. Just save the arguments that we 1720 // received in a ParenListExpr. 1721 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1722 // of the information that we have about the base 1723 // initializer. However, deconstructing the ASTs is a dicey process, 1724 // and this approach is far more likely to get the corner cases right. 1725 if (CurContext->isDependentContext()) { 1726 ExprResult Init 1727 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1728 NumArgs, RParenLoc)); 1729 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1730 Constructor, Init.takeAs<Expr>(), 1731 RParenLoc); 1732 } 1733 1734 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1735 DelegationInit.takeAs<Expr>(), 1736 RParenLoc); 1737} 1738 1739MemInitResult 1740Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1741 Expr **Args, unsigned NumArgs, 1742 SourceLocation LParenLoc, SourceLocation RParenLoc, 1743 CXXRecordDecl *ClassDecl, 1744 SourceLocation EllipsisLoc) { 1745 bool HasDependentArg = false; 1746 for (unsigned i = 0; i < NumArgs; i++) 1747 HasDependentArg |= Args[i]->isTypeDependent(); 1748 1749 SourceLocation BaseLoc 1750 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1751 1752 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1753 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1754 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1755 1756 // C++ [class.base.init]p2: 1757 // [...] Unless the mem-initializer-id names a nonstatic data 1758 // member of the constructor's class or a direct or virtual base 1759 // of that class, the mem-initializer is ill-formed. A 1760 // mem-initializer-list can initialize a base class using any 1761 // name that denotes that base class type. 1762 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1763 1764 if (EllipsisLoc.isValid()) { 1765 // This is a pack expansion. 1766 if (!BaseType->containsUnexpandedParameterPack()) { 1767 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1768 << SourceRange(BaseLoc, RParenLoc); 1769 1770 EllipsisLoc = SourceLocation(); 1771 } 1772 } else { 1773 // Check for any unexpanded parameter packs. 1774 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1775 return true; 1776 1777 for (unsigned I = 0; I != NumArgs; ++I) 1778 if (DiagnoseUnexpandedParameterPack(Args[I])) 1779 return true; 1780 } 1781 1782 // Check for direct and virtual base classes. 1783 const CXXBaseSpecifier *DirectBaseSpec = 0; 1784 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1785 if (!Dependent) { 1786 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1787 BaseType)) 1788 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1789 LParenLoc, RParenLoc, ClassDecl); 1790 1791 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1792 VirtualBaseSpec); 1793 1794 // C++ [base.class.init]p2: 1795 // Unless the mem-initializer-id names a nonstatic data member of the 1796 // constructor's class or a direct or virtual base of that class, the 1797 // mem-initializer is ill-formed. 1798 if (!DirectBaseSpec && !VirtualBaseSpec) { 1799 // If the class has any dependent bases, then it's possible that 1800 // one of those types will resolve to the same type as 1801 // BaseType. Therefore, just treat this as a dependent base 1802 // class initialization. FIXME: Should we try to check the 1803 // initialization anyway? It seems odd. 1804 if (ClassDecl->hasAnyDependentBases()) 1805 Dependent = true; 1806 else 1807 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1808 << BaseType << Context.getTypeDeclType(ClassDecl) 1809 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1810 } 1811 } 1812 1813 if (Dependent) { 1814 // Can't check initialization for a base of dependent type or when 1815 // any of the arguments are type-dependent expressions. 1816 ExprResult BaseInit 1817 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1818 RParenLoc)); 1819 1820 // Erase any temporaries within this evaluation context; we're not 1821 // going to track them in the AST, since we'll be rebuilding the 1822 // ASTs during template instantiation. 1823 ExprTemporaries.erase( 1824 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1825 ExprTemporaries.end()); 1826 1827 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1828 /*IsVirtual=*/false, 1829 LParenLoc, 1830 BaseInit.takeAs<Expr>(), 1831 RParenLoc, 1832 EllipsisLoc); 1833 } 1834 1835 // C++ [base.class.init]p2: 1836 // If a mem-initializer-id is ambiguous because it designates both 1837 // a direct non-virtual base class and an inherited virtual base 1838 // class, the mem-initializer is ill-formed. 1839 if (DirectBaseSpec && VirtualBaseSpec) 1840 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1841 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1842 1843 CXXBaseSpecifier *BaseSpec 1844 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1845 if (!BaseSpec) 1846 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1847 1848 // Initialize the base. 1849 InitializedEntity BaseEntity = 1850 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1851 InitializationKind Kind = 1852 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1853 1854 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1855 1856 ExprResult BaseInit = 1857 InitSeq.Perform(*this, BaseEntity, Kind, 1858 MultiExprArg(*this, Args, NumArgs), 0); 1859 if (BaseInit.isInvalid()) 1860 return true; 1861 1862 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1863 1864 // C++0x [class.base.init]p7: 1865 // The initialization of each base and member constitutes a 1866 // full-expression. 1867 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 // If we are in a dependent context, template instantiation will 1872 // perform this type-checking again. Just save the arguments that we 1873 // received in a ParenListExpr. 1874 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1875 // of the information that we have about the base 1876 // initializer. However, deconstructing the ASTs is a dicey process, 1877 // and this approach is far more likely to get the corner cases right. 1878 if (CurContext->isDependentContext()) { 1879 ExprResult Init 1880 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1881 RParenLoc)); 1882 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1883 BaseSpec->isVirtual(), 1884 LParenLoc, 1885 Init.takeAs<Expr>(), 1886 RParenLoc, 1887 EllipsisLoc); 1888 } 1889 1890 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1891 BaseSpec->isVirtual(), 1892 LParenLoc, 1893 BaseInit.takeAs<Expr>(), 1894 RParenLoc, 1895 EllipsisLoc); 1896} 1897 1898/// ImplicitInitializerKind - How an implicit base or member initializer should 1899/// initialize its base or member. 1900enum ImplicitInitializerKind { 1901 IIK_Default, 1902 IIK_Copy, 1903 IIK_Move 1904}; 1905 1906static bool 1907BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1908 ImplicitInitializerKind ImplicitInitKind, 1909 CXXBaseSpecifier *BaseSpec, 1910 bool IsInheritedVirtualBase, 1911 CXXCtorInitializer *&CXXBaseInit) { 1912 InitializedEntity InitEntity 1913 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1914 IsInheritedVirtualBase); 1915 1916 ExprResult BaseInit; 1917 1918 switch (ImplicitInitKind) { 1919 case IIK_Default: { 1920 InitializationKind InitKind 1921 = InitializationKind::CreateDefault(Constructor->getLocation()); 1922 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1923 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1924 MultiExprArg(SemaRef, 0, 0)); 1925 break; 1926 } 1927 1928 case IIK_Copy: { 1929 ParmVarDecl *Param = Constructor->getParamDecl(0); 1930 QualType ParamType = Param->getType().getNonReferenceType(); 1931 1932 Expr *CopyCtorArg = 1933 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1934 Constructor->getLocation(), ParamType, 1935 VK_LValue, 0); 1936 1937 // Cast to the base class to avoid ambiguities. 1938 QualType ArgTy = 1939 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1940 ParamType.getQualifiers()); 1941 1942 CXXCastPath BasePath; 1943 BasePath.push_back(BaseSpec); 1944 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1945 CK_UncheckedDerivedToBase, 1946 VK_LValue, &BasePath).take(); 1947 1948 InitializationKind InitKind 1949 = InitializationKind::CreateDirect(Constructor->getLocation(), 1950 SourceLocation(), SourceLocation()); 1951 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1952 &CopyCtorArg, 1); 1953 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1954 MultiExprArg(&CopyCtorArg, 1)); 1955 break; 1956 } 1957 1958 case IIK_Move: 1959 assert(false && "Unhandled initializer kind!"); 1960 } 1961 1962 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1963 if (BaseInit.isInvalid()) 1964 return true; 1965 1966 CXXBaseInit = 1967 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1968 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1969 SourceLocation()), 1970 BaseSpec->isVirtual(), 1971 SourceLocation(), 1972 BaseInit.takeAs<Expr>(), 1973 SourceLocation(), 1974 SourceLocation()); 1975 1976 return false; 1977} 1978 1979static bool 1980BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1981 ImplicitInitializerKind ImplicitInitKind, 1982 FieldDecl *Field, 1983 CXXCtorInitializer *&CXXMemberInit) { 1984 if (Field->isInvalidDecl()) 1985 return true; 1986 1987 SourceLocation Loc = Constructor->getLocation(); 1988 1989 if (ImplicitInitKind == IIK_Copy) { 1990 ParmVarDecl *Param = Constructor->getParamDecl(0); 1991 QualType ParamType = Param->getType().getNonReferenceType(); 1992 1993 Expr *MemberExprBase = 1994 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1995 Loc, ParamType, VK_LValue, 0); 1996 1997 // Build a reference to this field within the parameter. 1998 CXXScopeSpec SS; 1999 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2000 Sema::LookupMemberName); 2001 MemberLookup.addDecl(Field, AS_public); 2002 MemberLookup.resolveKind(); 2003 ExprResult CopyCtorArg 2004 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2005 ParamType, Loc, 2006 /*IsArrow=*/false, 2007 SS, 2008 /*FirstQualifierInScope=*/0, 2009 MemberLookup, 2010 /*TemplateArgs=*/0); 2011 if (CopyCtorArg.isInvalid()) 2012 return true; 2013 2014 // When the field we are copying is an array, create index variables for 2015 // each dimension of the array. We use these index variables to subscript 2016 // the source array, and other clients (e.g., CodeGen) will perform the 2017 // necessary iteration with these index variables. 2018 llvm::SmallVector<VarDecl *, 4> IndexVariables; 2019 QualType BaseType = Field->getType(); 2020 QualType SizeType = SemaRef.Context.getSizeType(); 2021 while (const ConstantArrayType *Array 2022 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2023 // Create the iteration variable for this array index. 2024 IdentifierInfo *IterationVarName = 0; 2025 { 2026 llvm::SmallString<8> Str; 2027 llvm::raw_svector_ostream OS(Str); 2028 OS << "__i" << IndexVariables.size(); 2029 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2030 } 2031 VarDecl *IterationVar 2032 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2033 IterationVarName, SizeType, 2034 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2035 SC_None, SC_None); 2036 IndexVariables.push_back(IterationVar); 2037 2038 // Create a reference to the iteration variable. 2039 ExprResult IterationVarRef 2040 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2041 assert(!IterationVarRef.isInvalid() && 2042 "Reference to invented variable cannot fail!"); 2043 2044 // Subscript the array with this iteration variable. 2045 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2046 Loc, 2047 IterationVarRef.take(), 2048 Loc); 2049 if (CopyCtorArg.isInvalid()) 2050 return true; 2051 2052 BaseType = Array->getElementType(); 2053 } 2054 2055 // Construct the entity that we will be initializing. For an array, this 2056 // will be first element in the array, which may require several levels 2057 // of array-subscript entities. 2058 llvm::SmallVector<InitializedEntity, 4> Entities; 2059 Entities.reserve(1 + IndexVariables.size()); 2060 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2061 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2062 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2063 0, 2064 Entities.back())); 2065 2066 // Direct-initialize to use the copy constructor. 2067 InitializationKind InitKind = 2068 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2069 2070 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2071 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2072 &CopyCtorArgE, 1); 2073 2074 ExprResult MemberInit 2075 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2076 MultiExprArg(&CopyCtorArgE, 1)); 2077 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2078 if (MemberInit.isInvalid()) 2079 return true; 2080 2081 CXXMemberInit 2082 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 2083 MemberInit.takeAs<Expr>(), Loc, 2084 IndexVariables.data(), 2085 IndexVariables.size()); 2086 return false; 2087 } 2088 2089 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2090 2091 QualType FieldBaseElementType = 2092 SemaRef.Context.getBaseElementType(Field->getType()); 2093 2094 if (FieldBaseElementType->isRecordType()) { 2095 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2096 InitializationKind InitKind = 2097 InitializationKind::CreateDefault(Loc); 2098 2099 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2100 ExprResult MemberInit = 2101 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2102 2103 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2104 if (MemberInit.isInvalid()) 2105 return true; 2106 2107 CXXMemberInit = 2108 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2109 Field, Loc, Loc, 2110 MemberInit.get(), 2111 Loc); 2112 return false; 2113 } 2114 2115 if (!Field->getParent()->isUnion()) { 2116 if (FieldBaseElementType->isReferenceType()) { 2117 SemaRef.Diag(Constructor->getLocation(), 2118 diag::err_uninitialized_member_in_ctor) 2119 << (int)Constructor->isImplicit() 2120 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2121 << 0 << Field->getDeclName(); 2122 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2123 return true; 2124 } 2125 2126 if (FieldBaseElementType.isConstQualified()) { 2127 SemaRef.Diag(Constructor->getLocation(), 2128 diag::err_uninitialized_member_in_ctor) 2129 << (int)Constructor->isImplicit() 2130 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2131 << 1 << Field->getDeclName(); 2132 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2133 return true; 2134 } 2135 } 2136 2137 // Nothing to initialize. 2138 CXXMemberInit = 0; 2139 return false; 2140} 2141 2142namespace { 2143struct BaseAndFieldInfo { 2144 Sema &S; 2145 CXXConstructorDecl *Ctor; 2146 bool AnyErrorsInInits; 2147 ImplicitInitializerKind IIK; 2148 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2149 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2150 2151 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2152 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2153 // FIXME: Handle implicit move constructors. 2154 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2155 IIK = IIK_Copy; 2156 else 2157 IIK = IIK_Default; 2158 } 2159}; 2160} 2161 2162static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2163 FieldDecl *Top, FieldDecl *Field) { 2164 2165 // Overwhelmingly common case: we have a direct initializer for this field. 2166 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2167 Info.AllToInit.push_back(Init); 2168 return false; 2169 } 2170 2171 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2172 // has a brace-or-equal-initializer, the entity is initialized as specified 2173 // in [dcl.init]. 2174 if (Field->hasInClassInitializer()) { 2175 Info.AllToInit.push_back( 2176 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2177 SourceLocation(), 2178 SourceLocation(), 0, 2179 SourceLocation())); 2180 return false; 2181 } 2182 2183 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2184 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2185 assert(FieldClassType && "anonymous struct/union without record type"); 2186 CXXRecordDecl *FieldClassDecl 2187 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2188 2189 // Even though union members never have non-trivial default 2190 // constructions in C++03, we still build member initializers for aggregate 2191 // record types which can be union members, and C++0x allows non-trivial 2192 // default constructors for union members, so we ensure that only one 2193 // member is initialized for these. 2194 if (FieldClassDecl->isUnion()) { 2195 // First check for an explicit initializer for one field. 2196 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2197 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2198 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2199 Info.AllToInit.push_back(Init); 2200 2201 // Once we've initialized a field of an anonymous union, the union 2202 // field in the class is also initialized, so exit immediately. 2203 return false; 2204 } else if ((*FA)->isAnonymousStructOrUnion()) { 2205 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2206 return true; 2207 } 2208 } 2209 2210 // Fallthrough and construct a default initializer for the union as 2211 // a whole, which can call its default constructor if such a thing exists 2212 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2213 // behavior going forward with C++0x, when anonymous unions there are 2214 // finalized, we should revisit this. 2215 } else { 2216 // For structs, we simply descend through to initialize all members where 2217 // necessary. 2218 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2219 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2220 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2221 return true; 2222 } 2223 } 2224 } 2225 2226 // Don't try to build an implicit initializer if there were semantic 2227 // errors in any of the initializers (and therefore we might be 2228 // missing some that the user actually wrote). 2229 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2230 return false; 2231 2232 CXXCtorInitializer *Init = 0; 2233 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2234 return true; 2235 2236 if (Init) 2237 Info.AllToInit.push_back(Init); 2238 2239 return false; 2240} 2241 2242bool 2243Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2244 CXXCtorInitializer *Initializer) { 2245 assert(Initializer->isDelegatingInitializer()); 2246 Constructor->setNumCtorInitializers(1); 2247 CXXCtorInitializer **initializer = 2248 new (Context) CXXCtorInitializer*[1]; 2249 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2250 Constructor->setCtorInitializers(initializer); 2251 2252 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2253 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2254 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2255 } 2256 2257 DelegatingCtorDecls.push_back(Constructor); 2258 2259 return false; 2260} 2261 2262bool 2263Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2264 CXXCtorInitializer **Initializers, 2265 unsigned NumInitializers, 2266 bool AnyErrors) { 2267 if (Constructor->getDeclContext()->isDependentContext()) { 2268 // Just store the initializers as written, they will be checked during 2269 // instantiation. 2270 if (NumInitializers > 0) { 2271 Constructor->setNumCtorInitializers(NumInitializers); 2272 CXXCtorInitializer **baseOrMemberInitializers = 2273 new (Context) CXXCtorInitializer*[NumInitializers]; 2274 memcpy(baseOrMemberInitializers, Initializers, 2275 NumInitializers * sizeof(CXXCtorInitializer*)); 2276 Constructor->setCtorInitializers(baseOrMemberInitializers); 2277 } 2278 2279 return false; 2280 } 2281 2282 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2283 2284 // We need to build the initializer AST according to order of construction 2285 // and not what user specified in the Initializers list. 2286 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2287 if (!ClassDecl) 2288 return true; 2289 2290 bool HadError = false; 2291 2292 for (unsigned i = 0; i < NumInitializers; i++) { 2293 CXXCtorInitializer *Member = Initializers[i]; 2294 2295 if (Member->isBaseInitializer()) 2296 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2297 else 2298 Info.AllBaseFields[Member->getAnyMember()] = Member; 2299 } 2300 2301 // Keep track of the direct virtual bases. 2302 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2303 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2304 E = ClassDecl->bases_end(); I != E; ++I) { 2305 if (I->isVirtual()) 2306 DirectVBases.insert(I); 2307 } 2308 2309 // Push virtual bases before others. 2310 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2311 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2312 2313 if (CXXCtorInitializer *Value 2314 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2315 Info.AllToInit.push_back(Value); 2316 } else if (!AnyErrors) { 2317 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2318 CXXCtorInitializer *CXXBaseInit; 2319 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2320 VBase, IsInheritedVirtualBase, 2321 CXXBaseInit)) { 2322 HadError = true; 2323 continue; 2324 } 2325 2326 Info.AllToInit.push_back(CXXBaseInit); 2327 } 2328 } 2329 2330 // Non-virtual bases. 2331 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2332 E = ClassDecl->bases_end(); Base != E; ++Base) { 2333 // Virtuals are in the virtual base list and already constructed. 2334 if (Base->isVirtual()) 2335 continue; 2336 2337 if (CXXCtorInitializer *Value 2338 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2339 Info.AllToInit.push_back(Value); 2340 } else if (!AnyErrors) { 2341 CXXCtorInitializer *CXXBaseInit; 2342 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2343 Base, /*IsInheritedVirtualBase=*/false, 2344 CXXBaseInit)) { 2345 HadError = true; 2346 continue; 2347 } 2348 2349 Info.AllToInit.push_back(CXXBaseInit); 2350 } 2351 } 2352 2353 // Fields. 2354 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2355 E = ClassDecl->field_end(); Field != E; ++Field) { 2356 if ((*Field)->getType()->isIncompleteArrayType()) { 2357 assert(ClassDecl->hasFlexibleArrayMember() && 2358 "Incomplete array type is not valid"); 2359 continue; 2360 } 2361 if (CollectFieldInitializer(*this, Info, *Field, *Field)) 2362 HadError = true; 2363 } 2364 2365 NumInitializers = Info.AllToInit.size(); 2366 if (NumInitializers > 0) { 2367 Constructor->setNumCtorInitializers(NumInitializers); 2368 CXXCtorInitializer **baseOrMemberInitializers = 2369 new (Context) CXXCtorInitializer*[NumInitializers]; 2370 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2371 NumInitializers * sizeof(CXXCtorInitializer*)); 2372 Constructor->setCtorInitializers(baseOrMemberInitializers); 2373 2374 // Constructors implicitly reference the base and member 2375 // destructors. 2376 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2377 Constructor->getParent()); 2378 } 2379 2380 return HadError; 2381} 2382 2383static void *GetKeyForTopLevelField(FieldDecl *Field) { 2384 // For anonymous unions, use the class declaration as the key. 2385 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2386 if (RT->getDecl()->isAnonymousStructOrUnion()) 2387 return static_cast<void *>(RT->getDecl()); 2388 } 2389 return static_cast<void *>(Field); 2390} 2391 2392static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2393 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2394} 2395 2396static void *GetKeyForMember(ASTContext &Context, 2397 CXXCtorInitializer *Member) { 2398 if (!Member->isAnyMemberInitializer()) 2399 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2400 2401 // For fields injected into the class via declaration of an anonymous union, 2402 // use its anonymous union class declaration as the unique key. 2403 FieldDecl *Field = Member->getAnyMember(); 2404 2405 // If the field is a member of an anonymous struct or union, our key 2406 // is the anonymous record decl that's a direct child of the class. 2407 RecordDecl *RD = Field->getParent(); 2408 if (RD->isAnonymousStructOrUnion()) { 2409 while (true) { 2410 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2411 if (Parent->isAnonymousStructOrUnion()) 2412 RD = Parent; 2413 else 2414 break; 2415 } 2416 2417 return static_cast<void *>(RD); 2418 } 2419 2420 return static_cast<void *>(Field); 2421} 2422 2423static void 2424DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2425 const CXXConstructorDecl *Constructor, 2426 CXXCtorInitializer **Inits, 2427 unsigned NumInits) { 2428 if (Constructor->getDeclContext()->isDependentContext()) 2429 return; 2430 2431 // Don't check initializers order unless the warning is enabled at the 2432 // location of at least one initializer. 2433 bool ShouldCheckOrder = false; 2434 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2435 CXXCtorInitializer *Init = Inits[InitIndex]; 2436 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2437 Init->getSourceLocation()) 2438 != Diagnostic::Ignored) { 2439 ShouldCheckOrder = true; 2440 break; 2441 } 2442 } 2443 if (!ShouldCheckOrder) 2444 return; 2445 2446 // Build the list of bases and members in the order that they'll 2447 // actually be initialized. The explicit initializers should be in 2448 // this same order but may be missing things. 2449 llvm::SmallVector<const void*, 32> IdealInitKeys; 2450 2451 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2452 2453 // 1. Virtual bases. 2454 for (CXXRecordDecl::base_class_const_iterator VBase = 2455 ClassDecl->vbases_begin(), 2456 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2457 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2458 2459 // 2. Non-virtual bases. 2460 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2461 E = ClassDecl->bases_end(); Base != E; ++Base) { 2462 if (Base->isVirtual()) 2463 continue; 2464 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2465 } 2466 2467 // 3. Direct fields. 2468 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2469 E = ClassDecl->field_end(); Field != E; ++Field) 2470 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2471 2472 unsigned NumIdealInits = IdealInitKeys.size(); 2473 unsigned IdealIndex = 0; 2474 2475 CXXCtorInitializer *PrevInit = 0; 2476 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2477 CXXCtorInitializer *Init = Inits[InitIndex]; 2478 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2479 2480 // Scan forward to try to find this initializer in the idealized 2481 // initializers list. 2482 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2483 if (InitKey == IdealInitKeys[IdealIndex]) 2484 break; 2485 2486 // If we didn't find this initializer, it must be because we 2487 // scanned past it on a previous iteration. That can only 2488 // happen if we're out of order; emit a warning. 2489 if (IdealIndex == NumIdealInits && PrevInit) { 2490 Sema::SemaDiagnosticBuilder D = 2491 SemaRef.Diag(PrevInit->getSourceLocation(), 2492 diag::warn_initializer_out_of_order); 2493 2494 if (PrevInit->isAnyMemberInitializer()) 2495 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2496 else 2497 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2498 2499 if (Init->isAnyMemberInitializer()) 2500 D << 0 << Init->getAnyMember()->getDeclName(); 2501 else 2502 D << 1 << Init->getBaseClassInfo()->getType(); 2503 2504 // Move back to the initializer's location in the ideal list. 2505 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2506 if (InitKey == IdealInitKeys[IdealIndex]) 2507 break; 2508 2509 assert(IdealIndex != NumIdealInits && 2510 "initializer not found in initializer list"); 2511 } 2512 2513 PrevInit = Init; 2514 } 2515} 2516 2517namespace { 2518bool CheckRedundantInit(Sema &S, 2519 CXXCtorInitializer *Init, 2520 CXXCtorInitializer *&PrevInit) { 2521 if (!PrevInit) { 2522 PrevInit = Init; 2523 return false; 2524 } 2525 2526 if (FieldDecl *Field = Init->getMember()) 2527 S.Diag(Init->getSourceLocation(), 2528 diag::err_multiple_mem_initialization) 2529 << Field->getDeclName() 2530 << Init->getSourceRange(); 2531 else { 2532 const Type *BaseClass = Init->getBaseClass(); 2533 assert(BaseClass && "neither field nor base"); 2534 S.Diag(Init->getSourceLocation(), 2535 diag::err_multiple_base_initialization) 2536 << QualType(BaseClass, 0) 2537 << Init->getSourceRange(); 2538 } 2539 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2540 << 0 << PrevInit->getSourceRange(); 2541 2542 return true; 2543} 2544 2545typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2546typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2547 2548bool CheckRedundantUnionInit(Sema &S, 2549 CXXCtorInitializer *Init, 2550 RedundantUnionMap &Unions) { 2551 FieldDecl *Field = Init->getAnyMember(); 2552 RecordDecl *Parent = Field->getParent(); 2553 if (!Parent->isAnonymousStructOrUnion()) 2554 return false; 2555 2556 NamedDecl *Child = Field; 2557 do { 2558 if (Parent->isUnion()) { 2559 UnionEntry &En = Unions[Parent]; 2560 if (En.first && En.first != Child) { 2561 S.Diag(Init->getSourceLocation(), 2562 diag::err_multiple_mem_union_initialization) 2563 << Field->getDeclName() 2564 << Init->getSourceRange(); 2565 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2566 << 0 << En.second->getSourceRange(); 2567 return true; 2568 } else if (!En.first) { 2569 En.first = Child; 2570 En.second = Init; 2571 } 2572 } 2573 2574 Child = Parent; 2575 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2576 } while (Parent->isAnonymousStructOrUnion()); 2577 2578 return false; 2579} 2580} 2581 2582/// ActOnMemInitializers - Handle the member initializers for a constructor. 2583void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2584 SourceLocation ColonLoc, 2585 MemInitTy **meminits, unsigned NumMemInits, 2586 bool AnyErrors) { 2587 if (!ConstructorDecl) 2588 return; 2589 2590 AdjustDeclIfTemplate(ConstructorDecl); 2591 2592 CXXConstructorDecl *Constructor 2593 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2594 2595 if (!Constructor) { 2596 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2597 return; 2598 } 2599 2600 CXXCtorInitializer **MemInits = 2601 reinterpret_cast<CXXCtorInitializer **>(meminits); 2602 2603 // Mapping for the duplicate initializers check. 2604 // For member initializers, this is keyed with a FieldDecl*. 2605 // For base initializers, this is keyed with a Type*. 2606 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2607 2608 // Mapping for the inconsistent anonymous-union initializers check. 2609 RedundantUnionMap MemberUnions; 2610 2611 bool HadError = false; 2612 for (unsigned i = 0; i < NumMemInits; i++) { 2613 CXXCtorInitializer *Init = MemInits[i]; 2614 2615 // Set the source order index. 2616 Init->setSourceOrder(i); 2617 2618 if (Init->isAnyMemberInitializer()) { 2619 FieldDecl *Field = Init->getAnyMember(); 2620 if (CheckRedundantInit(*this, Init, Members[Field]) || 2621 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2622 HadError = true; 2623 } else if (Init->isBaseInitializer()) { 2624 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2625 if (CheckRedundantInit(*this, Init, Members[Key])) 2626 HadError = true; 2627 } else { 2628 assert(Init->isDelegatingInitializer()); 2629 // This must be the only initializer 2630 if (i != 0 || NumMemInits > 1) { 2631 Diag(MemInits[0]->getSourceLocation(), 2632 diag::err_delegating_initializer_alone) 2633 << MemInits[0]->getSourceRange(); 2634 HadError = true; 2635 // We will treat this as being the only initializer. 2636 } 2637 SetDelegatingInitializer(Constructor, MemInits[i]); 2638 // Return immediately as the initializer is set. 2639 return; 2640 } 2641 } 2642 2643 if (HadError) 2644 return; 2645 2646 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2647 2648 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2649} 2650 2651void 2652Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2653 CXXRecordDecl *ClassDecl) { 2654 // Ignore dependent contexts. 2655 if (ClassDecl->isDependentContext()) 2656 return; 2657 2658 // FIXME: all the access-control diagnostics are positioned on the 2659 // field/base declaration. That's probably good; that said, the 2660 // user might reasonably want to know why the destructor is being 2661 // emitted, and we currently don't say. 2662 2663 // Non-static data members. 2664 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2665 E = ClassDecl->field_end(); I != E; ++I) { 2666 FieldDecl *Field = *I; 2667 if (Field->isInvalidDecl()) 2668 continue; 2669 QualType FieldType = Context.getBaseElementType(Field->getType()); 2670 2671 const RecordType* RT = FieldType->getAs<RecordType>(); 2672 if (!RT) 2673 continue; 2674 2675 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2676 if (FieldClassDecl->isInvalidDecl()) 2677 continue; 2678 if (FieldClassDecl->hasTrivialDestructor()) 2679 continue; 2680 2681 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2682 assert(Dtor && "No dtor found for FieldClassDecl!"); 2683 CheckDestructorAccess(Field->getLocation(), Dtor, 2684 PDiag(diag::err_access_dtor_field) 2685 << Field->getDeclName() 2686 << FieldType); 2687 2688 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2689 } 2690 2691 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2692 2693 // Bases. 2694 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2695 E = ClassDecl->bases_end(); Base != E; ++Base) { 2696 // Bases are always records in a well-formed non-dependent class. 2697 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2698 2699 // Remember direct virtual bases. 2700 if (Base->isVirtual()) 2701 DirectVirtualBases.insert(RT); 2702 2703 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2704 // If our base class is invalid, we probably can't get its dtor anyway. 2705 if (BaseClassDecl->isInvalidDecl()) 2706 continue; 2707 // Ignore trivial destructors. 2708 if (BaseClassDecl->hasTrivialDestructor()) 2709 continue; 2710 2711 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2712 assert(Dtor && "No dtor found for BaseClassDecl!"); 2713 2714 // FIXME: caret should be on the start of the class name 2715 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2716 PDiag(diag::err_access_dtor_base) 2717 << Base->getType() 2718 << Base->getSourceRange()); 2719 2720 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2721 } 2722 2723 // Virtual bases. 2724 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2725 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2726 2727 // Bases are always records in a well-formed non-dependent class. 2728 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2729 2730 // Ignore direct virtual bases. 2731 if (DirectVirtualBases.count(RT)) 2732 continue; 2733 2734 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2735 // If our base class is invalid, we probably can't get its dtor anyway. 2736 if (BaseClassDecl->isInvalidDecl()) 2737 continue; 2738 // Ignore trivial destructors. 2739 if (BaseClassDecl->hasTrivialDestructor()) 2740 continue; 2741 2742 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2743 assert(Dtor && "No dtor found for BaseClassDecl!"); 2744 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2745 PDiag(diag::err_access_dtor_vbase) 2746 << VBase->getType()); 2747 2748 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2749 } 2750} 2751 2752void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2753 if (!CDtorDecl) 2754 return; 2755 2756 if (CXXConstructorDecl *Constructor 2757 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2758 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2759} 2760 2761bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2762 unsigned DiagID, AbstractDiagSelID SelID) { 2763 if (SelID == -1) 2764 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2765 else 2766 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2767} 2768 2769bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2770 const PartialDiagnostic &PD) { 2771 if (!getLangOptions().CPlusPlus) 2772 return false; 2773 2774 if (const ArrayType *AT = Context.getAsArrayType(T)) 2775 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2776 2777 if (const PointerType *PT = T->getAs<PointerType>()) { 2778 // Find the innermost pointer type. 2779 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2780 PT = T; 2781 2782 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2783 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2784 } 2785 2786 const RecordType *RT = T->getAs<RecordType>(); 2787 if (!RT) 2788 return false; 2789 2790 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2791 2792 // We can't answer whether something is abstract until it has a 2793 // definition. If it's currently being defined, we'll walk back 2794 // over all the declarations when we have a full definition. 2795 const CXXRecordDecl *Def = RD->getDefinition(); 2796 if (!Def || Def->isBeingDefined()) 2797 return false; 2798 2799 if (!RD->isAbstract()) 2800 return false; 2801 2802 Diag(Loc, PD) << RD->getDeclName(); 2803 DiagnoseAbstractType(RD); 2804 2805 return true; 2806} 2807 2808void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2809 // Check if we've already emitted the list of pure virtual functions 2810 // for this class. 2811 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2812 return; 2813 2814 CXXFinalOverriderMap FinalOverriders; 2815 RD->getFinalOverriders(FinalOverriders); 2816 2817 // Keep a set of seen pure methods so we won't diagnose the same method 2818 // more than once. 2819 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2820 2821 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2822 MEnd = FinalOverriders.end(); 2823 M != MEnd; 2824 ++M) { 2825 for (OverridingMethods::iterator SO = M->second.begin(), 2826 SOEnd = M->second.end(); 2827 SO != SOEnd; ++SO) { 2828 // C++ [class.abstract]p4: 2829 // A class is abstract if it contains or inherits at least one 2830 // pure virtual function for which the final overrider is pure 2831 // virtual. 2832 2833 // 2834 if (SO->second.size() != 1) 2835 continue; 2836 2837 if (!SO->second.front().Method->isPure()) 2838 continue; 2839 2840 if (!SeenPureMethods.insert(SO->second.front().Method)) 2841 continue; 2842 2843 Diag(SO->second.front().Method->getLocation(), 2844 diag::note_pure_virtual_function) 2845 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2846 } 2847 } 2848 2849 if (!PureVirtualClassDiagSet) 2850 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2851 PureVirtualClassDiagSet->insert(RD); 2852} 2853 2854namespace { 2855struct AbstractUsageInfo { 2856 Sema &S; 2857 CXXRecordDecl *Record; 2858 CanQualType AbstractType; 2859 bool Invalid; 2860 2861 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2862 : S(S), Record(Record), 2863 AbstractType(S.Context.getCanonicalType( 2864 S.Context.getTypeDeclType(Record))), 2865 Invalid(false) {} 2866 2867 void DiagnoseAbstractType() { 2868 if (Invalid) return; 2869 S.DiagnoseAbstractType(Record); 2870 Invalid = true; 2871 } 2872 2873 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2874}; 2875 2876struct CheckAbstractUsage { 2877 AbstractUsageInfo &Info; 2878 const NamedDecl *Ctx; 2879 2880 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2881 : Info(Info), Ctx(Ctx) {} 2882 2883 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2884 switch (TL.getTypeLocClass()) { 2885#define ABSTRACT_TYPELOC(CLASS, PARENT) 2886#define TYPELOC(CLASS, PARENT) \ 2887 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2888#include "clang/AST/TypeLocNodes.def" 2889 } 2890 } 2891 2892 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2893 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2894 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2895 if (!TL.getArg(I)) 2896 continue; 2897 2898 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2899 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2900 } 2901 } 2902 2903 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2904 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2905 } 2906 2907 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2908 // Visit the type parameters from a permissive context. 2909 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2910 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2911 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2912 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2913 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2914 // TODO: other template argument types? 2915 } 2916 } 2917 2918 // Visit pointee types from a permissive context. 2919#define CheckPolymorphic(Type) \ 2920 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2921 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2922 } 2923 CheckPolymorphic(PointerTypeLoc) 2924 CheckPolymorphic(ReferenceTypeLoc) 2925 CheckPolymorphic(MemberPointerTypeLoc) 2926 CheckPolymorphic(BlockPointerTypeLoc) 2927 2928 /// Handle all the types we haven't given a more specific 2929 /// implementation for above. 2930 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2931 // Every other kind of type that we haven't called out already 2932 // that has an inner type is either (1) sugar or (2) contains that 2933 // inner type in some way as a subobject. 2934 if (TypeLoc Next = TL.getNextTypeLoc()) 2935 return Visit(Next, Sel); 2936 2937 // If there's no inner type and we're in a permissive context, 2938 // don't diagnose. 2939 if (Sel == Sema::AbstractNone) return; 2940 2941 // Check whether the type matches the abstract type. 2942 QualType T = TL.getType(); 2943 if (T->isArrayType()) { 2944 Sel = Sema::AbstractArrayType; 2945 T = Info.S.Context.getBaseElementType(T); 2946 } 2947 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2948 if (CT != Info.AbstractType) return; 2949 2950 // It matched; do some magic. 2951 if (Sel == Sema::AbstractArrayType) { 2952 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2953 << T << TL.getSourceRange(); 2954 } else { 2955 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2956 << Sel << T << TL.getSourceRange(); 2957 } 2958 Info.DiagnoseAbstractType(); 2959 } 2960}; 2961 2962void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2963 Sema::AbstractDiagSelID Sel) { 2964 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2965} 2966 2967} 2968 2969/// Check for invalid uses of an abstract type in a method declaration. 2970static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2971 CXXMethodDecl *MD) { 2972 // No need to do the check on definitions, which require that 2973 // the return/param types be complete. 2974 if (MD->doesThisDeclarationHaveABody()) 2975 return; 2976 2977 // For safety's sake, just ignore it if we don't have type source 2978 // information. This should never happen for non-implicit methods, 2979 // but... 2980 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2981 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2982} 2983 2984/// Check for invalid uses of an abstract type within a class definition. 2985static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2986 CXXRecordDecl *RD) { 2987 for (CXXRecordDecl::decl_iterator 2988 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2989 Decl *D = *I; 2990 if (D->isImplicit()) continue; 2991 2992 // Methods and method templates. 2993 if (isa<CXXMethodDecl>(D)) { 2994 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2995 } else if (isa<FunctionTemplateDecl>(D)) { 2996 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2997 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2998 2999 // Fields and static variables. 3000 } else if (isa<FieldDecl>(D)) { 3001 FieldDecl *FD = cast<FieldDecl>(D); 3002 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3003 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3004 } else if (isa<VarDecl>(D)) { 3005 VarDecl *VD = cast<VarDecl>(D); 3006 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3007 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3008 3009 // Nested classes and class templates. 3010 } else if (isa<CXXRecordDecl>(D)) { 3011 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3012 } else if (isa<ClassTemplateDecl>(D)) { 3013 CheckAbstractClassUsage(Info, 3014 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3015 } 3016 } 3017} 3018 3019/// \brief Perform semantic checks on a class definition that has been 3020/// completing, introducing implicitly-declared members, checking for 3021/// abstract types, etc. 3022void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3023 if (!Record) 3024 return; 3025 3026 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3027 AbstractUsageInfo Info(*this, Record); 3028 CheckAbstractClassUsage(Info, Record); 3029 } 3030 3031 // If this is not an aggregate type and has no user-declared constructor, 3032 // complain about any non-static data members of reference or const scalar 3033 // type, since they will never get initializers. 3034 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3035 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3036 bool Complained = false; 3037 for (RecordDecl::field_iterator F = Record->field_begin(), 3038 FEnd = Record->field_end(); 3039 F != FEnd; ++F) { 3040 if (F->hasInClassInitializer()) 3041 continue; 3042 3043 if (F->getType()->isReferenceType() || 3044 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3045 if (!Complained) { 3046 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3047 << Record->getTagKind() << Record; 3048 Complained = true; 3049 } 3050 3051 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3052 << F->getType()->isReferenceType() 3053 << F->getDeclName(); 3054 } 3055 } 3056 } 3057 3058 if (Record->isDynamicClass() && !Record->isDependentType()) 3059 DynamicClasses.push_back(Record); 3060 3061 if (Record->getIdentifier()) { 3062 // C++ [class.mem]p13: 3063 // If T is the name of a class, then each of the following shall have a 3064 // name different from T: 3065 // - every member of every anonymous union that is a member of class T. 3066 // 3067 // C++ [class.mem]p14: 3068 // In addition, if class T has a user-declared constructor (12.1), every 3069 // non-static data member of class T shall have a name different from T. 3070 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3071 R.first != R.second; ++R.first) { 3072 NamedDecl *D = *R.first; 3073 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3074 isa<IndirectFieldDecl>(D)) { 3075 Diag(D->getLocation(), diag::err_member_name_of_class) 3076 << D->getDeclName(); 3077 break; 3078 } 3079 } 3080 } 3081 3082 // Warn if the class has virtual methods but non-virtual public destructor. 3083 if (Record->isPolymorphic() && !Record->isDependentType()) { 3084 CXXDestructorDecl *dtor = Record->getDestructor(); 3085 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3086 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3087 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3088 } 3089 3090 // See if a method overloads virtual methods in a base 3091 /// class without overriding any. 3092 if (!Record->isDependentType()) { 3093 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3094 MEnd = Record->method_end(); 3095 M != MEnd; ++M) { 3096 if (!(*M)->isStatic()) 3097 DiagnoseHiddenVirtualMethods(Record, *M); 3098 } 3099 } 3100 3101 // Declare inherited constructors. We do this eagerly here because: 3102 // - The standard requires an eager diagnostic for conflicting inherited 3103 // constructors from different classes. 3104 // - The lazy declaration of the other implicit constructors is so as to not 3105 // waste space and performance on classes that are not meant to be 3106 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3107 // have inherited constructors. 3108 DeclareInheritedConstructors(Record); 3109 3110 if (!Record->isDependentType()) 3111 CheckExplicitlyDefaultedMethods(Record); 3112} 3113 3114void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3115 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3116 ME = Record->method_end(); 3117 MI != ME; ++MI) { 3118 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3119 switch (getSpecialMember(*MI)) { 3120 case CXXDefaultConstructor: 3121 CheckExplicitlyDefaultedDefaultConstructor( 3122 cast<CXXConstructorDecl>(*MI)); 3123 break; 3124 3125 case CXXDestructor: 3126 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3127 break; 3128 3129 case CXXCopyConstructor: 3130 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3131 break; 3132 3133 case CXXCopyAssignment: 3134 CheckExplicitlyDefaultedCopyAssignment(*MI); 3135 break; 3136 3137 case CXXMoveConstructor: 3138 case CXXMoveAssignment: 3139 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3140 break; 3141 3142 default: 3143 // FIXME: Do moves once they exist 3144 llvm_unreachable("non-special member explicitly defaulted!"); 3145 } 3146 } 3147 } 3148 3149} 3150 3151void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3152 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3153 3154 // Whether this was the first-declared instance of the constructor. 3155 // This affects whether we implicitly add an exception spec (and, eventually, 3156 // constexpr). It is also ill-formed to explicitly default a constructor such 3157 // that it would be deleted. (C++0x [decl.fct.def.default]) 3158 bool First = CD == CD->getCanonicalDecl(); 3159 3160 bool HadError = false; 3161 if (CD->getNumParams() != 0) { 3162 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3163 << CD->getSourceRange(); 3164 HadError = true; 3165 } 3166 3167 ImplicitExceptionSpecification Spec 3168 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3169 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3170 if (EPI.ExceptionSpecType == EST_Delayed) { 3171 // Exception specification depends on some deferred part of the class. We'll 3172 // try again when the class's definition has been fully processed. 3173 return; 3174 } 3175 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3176 *ExceptionType = Context.getFunctionType( 3177 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3178 3179 if (CtorType->hasExceptionSpec()) { 3180 if (CheckEquivalentExceptionSpec( 3181 PDiag(diag::err_incorrect_defaulted_exception_spec) 3182 << CXXDefaultConstructor, 3183 PDiag(), 3184 ExceptionType, SourceLocation(), 3185 CtorType, CD->getLocation())) { 3186 HadError = true; 3187 } 3188 } else if (First) { 3189 // We set the declaration to have the computed exception spec here. 3190 // We know there are no parameters. 3191 EPI.ExtInfo = CtorType->getExtInfo(); 3192 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3193 } 3194 3195 if (HadError) { 3196 CD->setInvalidDecl(); 3197 return; 3198 } 3199 3200 if (ShouldDeleteDefaultConstructor(CD)) { 3201 if (First) { 3202 CD->setDeletedAsWritten(); 3203 } else { 3204 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3205 << CXXDefaultConstructor; 3206 CD->setInvalidDecl(); 3207 } 3208 } 3209} 3210 3211void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3212 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3213 3214 // Whether this was the first-declared instance of the constructor. 3215 bool First = CD == CD->getCanonicalDecl(); 3216 3217 bool HadError = false; 3218 if (CD->getNumParams() != 1) { 3219 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3220 << CD->getSourceRange(); 3221 HadError = true; 3222 } 3223 3224 ImplicitExceptionSpecification Spec(Context); 3225 bool Const; 3226 llvm::tie(Spec, Const) = 3227 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3228 3229 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3230 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3231 *ExceptionType = Context.getFunctionType( 3232 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3233 3234 // Check for parameter type matching. 3235 // This is a copy ctor so we know it's a cv-qualified reference to T. 3236 QualType ArgType = CtorType->getArgType(0); 3237 if (ArgType->getPointeeType().isVolatileQualified()) { 3238 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3239 HadError = true; 3240 } 3241 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3242 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3243 HadError = true; 3244 } 3245 3246 if (CtorType->hasExceptionSpec()) { 3247 if (CheckEquivalentExceptionSpec( 3248 PDiag(diag::err_incorrect_defaulted_exception_spec) 3249 << CXXCopyConstructor, 3250 PDiag(), 3251 ExceptionType, SourceLocation(), 3252 CtorType, CD->getLocation())) { 3253 HadError = true; 3254 } 3255 } else if (First) { 3256 // We set the declaration to have the computed exception spec here. 3257 // We duplicate the one parameter type. 3258 EPI.ExtInfo = CtorType->getExtInfo(); 3259 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3260 } 3261 3262 if (HadError) { 3263 CD->setInvalidDecl(); 3264 return; 3265 } 3266 3267 if (ShouldDeleteCopyConstructor(CD)) { 3268 if (First) { 3269 CD->setDeletedAsWritten(); 3270 } else { 3271 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3272 << CXXCopyConstructor; 3273 CD->setInvalidDecl(); 3274 } 3275 } 3276} 3277 3278void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3279 assert(MD->isExplicitlyDefaulted()); 3280 3281 // Whether this was the first-declared instance of the operator 3282 bool First = MD == MD->getCanonicalDecl(); 3283 3284 bool HadError = false; 3285 if (MD->getNumParams() != 1) { 3286 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3287 << MD->getSourceRange(); 3288 HadError = true; 3289 } 3290 3291 QualType ReturnType = 3292 MD->getType()->getAs<FunctionType>()->getResultType(); 3293 if (!ReturnType->isLValueReferenceType() || 3294 !Context.hasSameType( 3295 Context.getCanonicalType(ReturnType->getPointeeType()), 3296 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3297 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3298 HadError = true; 3299 } 3300 3301 ImplicitExceptionSpecification Spec(Context); 3302 bool Const; 3303 llvm::tie(Spec, Const) = 3304 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3305 3306 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3307 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3308 *ExceptionType = Context.getFunctionType( 3309 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3310 3311 QualType ArgType = OperType->getArgType(0); 3312 if (!ArgType->isReferenceType()) { 3313 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3314 HadError = true; 3315 } else { 3316 if (ArgType->getPointeeType().isVolatileQualified()) { 3317 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3318 HadError = true; 3319 } 3320 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3321 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3322 HadError = true; 3323 } 3324 } 3325 3326 if (OperType->getTypeQuals()) { 3327 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3328 HadError = true; 3329 } 3330 3331 if (OperType->hasExceptionSpec()) { 3332 if (CheckEquivalentExceptionSpec( 3333 PDiag(diag::err_incorrect_defaulted_exception_spec) 3334 << CXXCopyAssignment, 3335 PDiag(), 3336 ExceptionType, SourceLocation(), 3337 OperType, MD->getLocation())) { 3338 HadError = true; 3339 } 3340 } else if (First) { 3341 // We set the declaration to have the computed exception spec here. 3342 // We duplicate the one parameter type. 3343 EPI.RefQualifier = OperType->getRefQualifier(); 3344 EPI.ExtInfo = OperType->getExtInfo(); 3345 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3346 } 3347 3348 if (HadError) { 3349 MD->setInvalidDecl(); 3350 return; 3351 } 3352 3353 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3354 if (First) { 3355 MD->setDeletedAsWritten(); 3356 } else { 3357 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3358 << CXXCopyAssignment; 3359 MD->setInvalidDecl(); 3360 } 3361 } 3362} 3363 3364void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3365 assert(DD->isExplicitlyDefaulted()); 3366 3367 // Whether this was the first-declared instance of the destructor. 3368 bool First = DD == DD->getCanonicalDecl(); 3369 3370 ImplicitExceptionSpecification Spec 3371 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3372 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3373 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3374 *ExceptionType = Context.getFunctionType( 3375 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3376 3377 if (DtorType->hasExceptionSpec()) { 3378 if (CheckEquivalentExceptionSpec( 3379 PDiag(diag::err_incorrect_defaulted_exception_spec) 3380 << CXXDestructor, 3381 PDiag(), 3382 ExceptionType, SourceLocation(), 3383 DtorType, DD->getLocation())) { 3384 DD->setInvalidDecl(); 3385 return; 3386 } 3387 } else if (First) { 3388 // We set the declaration to have the computed exception spec here. 3389 // There are no parameters. 3390 EPI.ExtInfo = DtorType->getExtInfo(); 3391 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3392 } 3393 3394 if (ShouldDeleteDestructor(DD)) { 3395 if (First) { 3396 DD->setDeletedAsWritten(); 3397 } else { 3398 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3399 << CXXDestructor; 3400 DD->setInvalidDecl(); 3401 } 3402 } 3403} 3404 3405bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3406 CXXRecordDecl *RD = CD->getParent(); 3407 assert(!RD->isDependentType() && "do deletion after instantiation"); 3408 if (!LangOpts.CPlusPlus0x) 3409 return false; 3410 3411 SourceLocation Loc = CD->getLocation(); 3412 3413 // Do access control from the constructor 3414 ContextRAII CtorContext(*this, CD); 3415 3416 bool Union = RD->isUnion(); 3417 bool AllConst = true; 3418 3419 // We do this because we should never actually use an anonymous 3420 // union's constructor. 3421 if (Union && RD->isAnonymousStructOrUnion()) 3422 return false; 3423 3424 // FIXME: We should put some diagnostic logic right into this function. 3425 3426 // C++0x [class.ctor]/5 3427 // A defaulted default constructor for class X is defined as deleted if: 3428 3429 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3430 BE = RD->bases_end(); 3431 BI != BE; ++BI) { 3432 // We'll handle this one later 3433 if (BI->isVirtual()) 3434 continue; 3435 3436 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3437 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3438 3439 // -- any [direct base class] has a type with a destructor that is 3440 // deleted or inaccessible from the defaulted default constructor 3441 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3442 if (BaseDtor->isDeleted()) 3443 return true; 3444 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3445 AR_accessible) 3446 return true; 3447 3448 // -- any [direct base class either] has no default constructor or 3449 // overload resolution as applied to [its] default constructor 3450 // results in an ambiguity or in a function that is deleted or 3451 // inaccessible from the defaulted default constructor 3452 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3453 if (!BaseDefault || BaseDefault->isDeleted()) 3454 return true; 3455 3456 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3457 PDiag()) != AR_accessible) 3458 return true; 3459 } 3460 3461 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3462 BE = RD->vbases_end(); 3463 BI != BE; ++BI) { 3464 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3465 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3466 3467 // -- any [virtual base class] has a type with a destructor that is 3468 // delete or inaccessible from the defaulted default constructor 3469 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3470 if (BaseDtor->isDeleted()) 3471 return true; 3472 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3473 AR_accessible) 3474 return true; 3475 3476 // -- any [virtual base class either] has no default constructor or 3477 // overload resolution as applied to [its] default constructor 3478 // results in an ambiguity or in a function that is deleted or 3479 // inaccessible from the defaulted default constructor 3480 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3481 if (!BaseDefault || BaseDefault->isDeleted()) 3482 return true; 3483 3484 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3485 PDiag()) != AR_accessible) 3486 return true; 3487 } 3488 3489 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3490 FE = RD->field_end(); 3491 FI != FE; ++FI) { 3492 if (FI->isInvalidDecl()) 3493 continue; 3494 3495 QualType FieldType = Context.getBaseElementType(FI->getType()); 3496 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3497 3498 // -- any non-static data member with no brace-or-equal-initializer is of 3499 // reference type 3500 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3501 return true; 3502 3503 // -- X is a union and all its variant members are of const-qualified type 3504 // (or array thereof) 3505 if (Union && !FieldType.isConstQualified()) 3506 AllConst = false; 3507 3508 if (FieldRecord) { 3509 // -- X is a union-like class that has a variant member with a non-trivial 3510 // default constructor 3511 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3512 return true; 3513 3514 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3515 if (FieldDtor->isDeleted()) 3516 return true; 3517 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3518 AR_accessible) 3519 return true; 3520 3521 // -- any non-variant non-static data member of const-qualified type (or 3522 // array thereof) with no brace-or-equal-initializer does not have a 3523 // user-provided default constructor 3524 if (FieldType.isConstQualified() && 3525 !FI->hasInClassInitializer() && 3526 !FieldRecord->hasUserProvidedDefaultConstructor()) 3527 return true; 3528 3529 if (!Union && FieldRecord->isUnion() && 3530 FieldRecord->isAnonymousStructOrUnion()) { 3531 // We're okay to reuse AllConst here since we only care about the 3532 // value otherwise if we're in a union. 3533 AllConst = true; 3534 3535 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3536 UE = FieldRecord->field_end(); 3537 UI != UE; ++UI) { 3538 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3539 CXXRecordDecl *UnionFieldRecord = 3540 UnionFieldType->getAsCXXRecordDecl(); 3541 3542 if (!UnionFieldType.isConstQualified()) 3543 AllConst = false; 3544 3545 if (UnionFieldRecord && 3546 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3547 return true; 3548 } 3549 3550 if (AllConst) 3551 return true; 3552 3553 // Don't try to initialize the anonymous union 3554 // This is technically non-conformant, but sanity demands it. 3555 continue; 3556 } 3557 3558 // -- any non-static data member with no brace-or-equal-initializer has 3559 // class type M (or array thereof) and either M has no default 3560 // constructor or overload resolution as applied to M's default 3561 // constructor results in an ambiguity or in a function that is deleted 3562 // or inaccessible from the defaulted default constructor. 3563 if (!FI->hasInClassInitializer()) { 3564 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3565 if (!FieldDefault || FieldDefault->isDeleted()) 3566 return true; 3567 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3568 PDiag()) != AR_accessible) 3569 return true; 3570 } 3571 } else if (!Union && FieldType.isConstQualified() && 3572 !FI->hasInClassInitializer()) { 3573 // -- any non-variant non-static data member of const-qualified type (or 3574 // array thereof) with no brace-or-equal-initializer does not have a 3575 // user-provided default constructor 3576 return true; 3577 } 3578 } 3579 3580 if (Union && AllConst) 3581 return true; 3582 3583 return false; 3584} 3585 3586bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3587 CXXRecordDecl *RD = CD->getParent(); 3588 assert(!RD->isDependentType() && "do deletion after instantiation"); 3589 if (!LangOpts.CPlusPlus0x) 3590 return false; 3591 3592 SourceLocation Loc = CD->getLocation(); 3593 3594 // Do access control from the constructor 3595 ContextRAII CtorContext(*this, CD); 3596 3597 bool Union = RD->isUnion(); 3598 3599 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3600 "copy assignment arg has no pointee type"); 3601 unsigned ArgQuals = 3602 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3603 Qualifiers::Const : 0; 3604 3605 // We do this because we should never actually use an anonymous 3606 // union's constructor. 3607 if (Union && RD->isAnonymousStructOrUnion()) 3608 return false; 3609 3610 // FIXME: We should put some diagnostic logic right into this function. 3611 3612 // C++0x [class.copy]/11 3613 // A defaulted [copy] constructor for class X is defined as delete if X has: 3614 3615 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3616 BE = RD->bases_end(); 3617 BI != BE; ++BI) { 3618 // We'll handle this one later 3619 if (BI->isVirtual()) 3620 continue; 3621 3622 QualType BaseType = BI->getType(); 3623 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3624 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3625 3626 // -- any [direct base class] of a type with a destructor that is deleted or 3627 // inaccessible from the defaulted constructor 3628 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3629 if (BaseDtor->isDeleted()) 3630 return true; 3631 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3632 AR_accessible) 3633 return true; 3634 3635 // -- a [direct base class] B that cannot be [copied] because overload 3636 // resolution, as applied to B's [copy] constructor, results in an 3637 // ambiguity or a function that is deleted or inaccessible from the 3638 // defaulted constructor 3639 CXXConstructorDecl *BaseCtor = LookupCopyConstructor(BaseDecl, ArgQuals); 3640 if (!BaseCtor || BaseCtor->isDeleted()) 3641 return true; 3642 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3643 AR_accessible) 3644 return true; 3645 } 3646 3647 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3648 BE = RD->vbases_end(); 3649 BI != BE; ++BI) { 3650 QualType BaseType = BI->getType(); 3651 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3652 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3653 3654 // -- any [virtual base class] of a type with a destructor that is deleted or 3655 // inaccessible from the defaulted constructor 3656 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3657 if (BaseDtor->isDeleted()) 3658 return true; 3659 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3660 AR_accessible) 3661 return true; 3662 3663 // -- a [virtual base class] B that cannot be [copied] because overload 3664 // resolution, as applied to B's [copy] constructor, results in an 3665 // ambiguity or a function that is deleted or inaccessible from the 3666 // defaulted constructor 3667 CXXConstructorDecl *BaseCtor = LookupCopyConstructor(BaseDecl, ArgQuals); 3668 if (!BaseCtor || BaseCtor->isDeleted()) 3669 return true; 3670 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3671 AR_accessible) 3672 return true; 3673 } 3674 3675 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3676 FE = RD->field_end(); 3677 FI != FE; ++FI) { 3678 QualType FieldType = Context.getBaseElementType(FI->getType()); 3679 3680 // -- for a copy constructor, a non-static data member of rvalue reference 3681 // type 3682 if (FieldType->isRValueReferenceType()) 3683 return true; 3684 3685 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3686 3687 if (FieldRecord) { 3688 // This is an anonymous union 3689 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3690 // Anonymous unions inside unions do not variant members create 3691 if (!Union) { 3692 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3693 UE = FieldRecord->field_end(); 3694 UI != UE; ++UI) { 3695 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3696 CXXRecordDecl *UnionFieldRecord = 3697 UnionFieldType->getAsCXXRecordDecl(); 3698 3699 // -- a variant member with a non-trivial [copy] constructor and X 3700 // is a union-like class 3701 if (UnionFieldRecord && 3702 !UnionFieldRecord->hasTrivialCopyConstructor()) 3703 return true; 3704 } 3705 } 3706 3707 // Don't try to initalize an anonymous union 3708 continue; 3709 } else { 3710 // -- a variant member with a non-trivial [copy] constructor and X is a 3711 // union-like class 3712 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3713 return true; 3714 3715 // -- any [non-static data member] of a type with a destructor that is 3716 // deleted or inaccessible from the defaulted constructor 3717 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3718 if (FieldDtor->isDeleted()) 3719 return true; 3720 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3721 AR_accessible) 3722 return true; 3723 } 3724 3725 // -- a [non-static data member of class type (or array thereof)] B that 3726 // cannot be [copied] because overload resolution, as applied to B's 3727 // [copy] constructor, results in an ambiguity or a function that is 3728 // deleted or inaccessible from the defaulted constructor 3729 CXXConstructorDecl *FieldCtor = LookupCopyConstructor(FieldRecord, 3730 ArgQuals); 3731 if (!FieldCtor || FieldCtor->isDeleted()) 3732 return true; 3733 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3734 PDiag()) != AR_accessible) 3735 return true; 3736 } 3737 } 3738 3739 return false; 3740} 3741 3742bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3743 CXXRecordDecl *RD = MD->getParent(); 3744 assert(!RD->isDependentType() && "do deletion after instantiation"); 3745 if (!LangOpts.CPlusPlus0x) 3746 return false; 3747 3748 SourceLocation Loc = MD->getLocation(); 3749 3750 // Do access control from the constructor 3751 ContextRAII MethodContext(*this, MD); 3752 3753 bool Union = RD->isUnion(); 3754 3755 bool ConstArg = 3756 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3757 3758 // We do this because we should never actually use an anonymous 3759 // union's constructor. 3760 if (Union && RD->isAnonymousStructOrUnion()) 3761 return false; 3762 3763 DeclarationName OperatorName = 3764 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3765 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3766 R.suppressDiagnostics(); 3767 3768 // FIXME: We should put some diagnostic logic right into this function. 3769 3770 // C++0x [class.copy]/11 3771 // A defaulted [copy] assignment operator for class X is defined as deleted 3772 // if X has: 3773 3774 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3775 BE = RD->bases_end(); 3776 BI != BE; ++BI) { 3777 // We'll handle this one later 3778 if (BI->isVirtual()) 3779 continue; 3780 3781 QualType BaseType = BI->getType(); 3782 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3783 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3784 3785 // -- a [direct base class] B that cannot be [copied] because overload 3786 // resolution, as applied to B's [copy] assignment operator, results in 3787 // an ambiguity or a function that is deleted or inaccessible from the 3788 // assignment operator 3789 3790 LookupQualifiedName(R, BaseDecl, false); 3791 3792 // Filter out any result that isn't a copy-assignment operator. 3793 LookupResult::Filter F = R.makeFilter(); 3794 while (F.hasNext()) { 3795 NamedDecl *D = F.next(); 3796 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3797 if (Method->isCopyAssignmentOperator()) 3798 continue; 3799 3800 F.erase(); 3801 } 3802 F.done(); 3803 3804 // Build a fake argument expression 3805 QualType ArgType = BaseType; 3806 QualType ThisType = BaseType; 3807 if (ConstArg) 3808 ArgType.addConst(); 3809 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3810 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3811 }; 3812 3813 OverloadCandidateSet OCS((Loc)); 3814 OverloadCandidateSet::iterator Best; 3815 3816 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3817 3818 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3819 OR_Success) 3820 return true; 3821 } 3822 3823 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3824 BE = RD->vbases_end(); 3825 BI != BE; ++BI) { 3826 QualType BaseType = BI->getType(); 3827 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3828 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3829 3830 // -- a [virtual base class] B that cannot be [copied] because overload 3831 // resolution, as applied to B's [copy] assignment operator, results in 3832 // an ambiguity or a function that is deleted or inaccessible from the 3833 // assignment operator 3834 3835 LookupQualifiedName(R, BaseDecl, false); 3836 3837 // Filter out any result that isn't a copy-assignment operator. 3838 LookupResult::Filter F = R.makeFilter(); 3839 while (F.hasNext()) { 3840 NamedDecl *D = F.next(); 3841 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3842 if (Method->isCopyAssignmentOperator()) 3843 continue; 3844 3845 F.erase(); 3846 } 3847 F.done(); 3848 3849 // Build a fake argument expression 3850 QualType ArgType = BaseType; 3851 QualType ThisType = BaseType; 3852 if (ConstArg) 3853 ArgType.addConst(); 3854 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3855 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3856 }; 3857 3858 OverloadCandidateSet OCS((Loc)); 3859 OverloadCandidateSet::iterator Best; 3860 3861 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3862 3863 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3864 OR_Success) 3865 return true; 3866 } 3867 3868 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3869 FE = RD->field_end(); 3870 FI != FE; ++FI) { 3871 QualType FieldType = Context.getBaseElementType(FI->getType()); 3872 3873 // -- a non-static data member of reference type 3874 if (FieldType->isReferenceType()) 3875 return true; 3876 3877 // -- a non-static data member of const non-class type (or array thereof) 3878 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3879 return true; 3880 3881 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3882 3883 if (FieldRecord) { 3884 // This is an anonymous union 3885 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3886 // Anonymous unions inside unions do not variant members create 3887 if (!Union) { 3888 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3889 UE = FieldRecord->field_end(); 3890 UI != UE; ++UI) { 3891 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3892 CXXRecordDecl *UnionFieldRecord = 3893 UnionFieldType->getAsCXXRecordDecl(); 3894 3895 // -- a variant member with a non-trivial [copy] assignment operator 3896 // and X is a union-like class 3897 if (UnionFieldRecord && 3898 !UnionFieldRecord->hasTrivialCopyAssignment()) 3899 return true; 3900 } 3901 } 3902 3903 // Don't try to initalize an anonymous union 3904 continue; 3905 // -- a variant member with a non-trivial [copy] assignment operator 3906 // and X is a union-like class 3907 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3908 return true; 3909 } 3910 3911 LookupQualifiedName(R, FieldRecord, false); 3912 3913 // Filter out any result that isn't a copy-assignment operator. 3914 LookupResult::Filter F = R.makeFilter(); 3915 while (F.hasNext()) { 3916 NamedDecl *D = F.next(); 3917 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3918 if (Method->isCopyAssignmentOperator()) 3919 continue; 3920 3921 F.erase(); 3922 } 3923 F.done(); 3924 3925 // Build a fake argument expression 3926 QualType ArgType = FieldType; 3927 QualType ThisType = FieldType; 3928 if (ConstArg) 3929 ArgType.addConst(); 3930 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3931 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3932 }; 3933 3934 OverloadCandidateSet OCS((Loc)); 3935 OverloadCandidateSet::iterator Best; 3936 3937 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3938 3939 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3940 OR_Success) 3941 return true; 3942 } 3943 } 3944 3945 return false; 3946} 3947 3948bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3949 CXXRecordDecl *RD = DD->getParent(); 3950 assert(!RD->isDependentType() && "do deletion after instantiation"); 3951 if (!LangOpts.CPlusPlus0x) 3952 return false; 3953 3954 SourceLocation Loc = DD->getLocation(); 3955 3956 // Do access control from the destructor 3957 ContextRAII CtorContext(*this, DD); 3958 3959 bool Union = RD->isUnion(); 3960 3961 // We do this because we should never actually use an anonymous 3962 // union's destructor. 3963 if (Union && RD->isAnonymousStructOrUnion()) 3964 return false; 3965 3966 // C++0x [class.dtor]p5 3967 // A defaulted destructor for a class X is defined as deleted if: 3968 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3969 BE = RD->bases_end(); 3970 BI != BE; ++BI) { 3971 // We'll handle this one later 3972 if (BI->isVirtual()) 3973 continue; 3974 3975 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3976 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3977 assert(BaseDtor && "base has no destructor"); 3978 3979 // -- any direct or virtual base class has a deleted destructor or 3980 // a destructor that is inaccessible from the defaulted destructor 3981 if (BaseDtor->isDeleted()) 3982 return true; 3983 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3984 AR_accessible) 3985 return true; 3986 } 3987 3988 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3989 BE = RD->vbases_end(); 3990 BI != BE; ++BI) { 3991 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3992 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3993 assert(BaseDtor && "base has no destructor"); 3994 3995 // -- any direct or virtual base class has a deleted destructor or 3996 // a destructor that is inaccessible from the defaulted destructor 3997 if (BaseDtor->isDeleted()) 3998 return true; 3999 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4000 AR_accessible) 4001 return true; 4002 } 4003 4004 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4005 FE = RD->field_end(); 4006 FI != FE; ++FI) { 4007 QualType FieldType = Context.getBaseElementType(FI->getType()); 4008 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4009 if (FieldRecord) { 4010 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4011 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4012 UE = FieldRecord->field_end(); 4013 UI != UE; ++UI) { 4014 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4015 CXXRecordDecl *UnionFieldRecord = 4016 UnionFieldType->getAsCXXRecordDecl(); 4017 4018 // -- X is a union-like class that has a variant member with a non- 4019 // trivial destructor. 4020 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4021 return true; 4022 } 4023 // Technically we are supposed to do this next check unconditionally. 4024 // But that makes absolutely no sense. 4025 } else { 4026 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4027 4028 // -- any of the non-static data members has class type M (or array 4029 // thereof) and M has a deleted destructor or a destructor that is 4030 // inaccessible from the defaulted destructor 4031 if (FieldDtor->isDeleted()) 4032 return true; 4033 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4034 AR_accessible) 4035 return true; 4036 4037 // -- X is a union-like class that has a variant member with a non- 4038 // trivial destructor. 4039 if (Union && !FieldDtor->isTrivial()) 4040 return true; 4041 } 4042 } 4043 } 4044 4045 if (DD->isVirtual()) { 4046 FunctionDecl *OperatorDelete = 0; 4047 DeclarationName Name = 4048 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4049 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4050 false)) 4051 return true; 4052 } 4053 4054 4055 return false; 4056} 4057 4058/// \brief Data used with FindHiddenVirtualMethod 4059namespace { 4060 struct FindHiddenVirtualMethodData { 4061 Sema *S; 4062 CXXMethodDecl *Method; 4063 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4064 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4065 }; 4066} 4067 4068/// \brief Member lookup function that determines whether a given C++ 4069/// method overloads virtual methods in a base class without overriding any, 4070/// to be used with CXXRecordDecl::lookupInBases(). 4071static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4072 CXXBasePath &Path, 4073 void *UserData) { 4074 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4075 4076 FindHiddenVirtualMethodData &Data 4077 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4078 4079 DeclarationName Name = Data.Method->getDeclName(); 4080 assert(Name.getNameKind() == DeclarationName::Identifier); 4081 4082 bool foundSameNameMethod = false; 4083 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4084 for (Path.Decls = BaseRecord->lookup(Name); 4085 Path.Decls.first != Path.Decls.second; 4086 ++Path.Decls.first) { 4087 NamedDecl *D = *Path.Decls.first; 4088 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4089 MD = MD->getCanonicalDecl(); 4090 foundSameNameMethod = true; 4091 // Interested only in hidden virtual methods. 4092 if (!MD->isVirtual()) 4093 continue; 4094 // If the method we are checking overrides a method from its base 4095 // don't warn about the other overloaded methods. 4096 if (!Data.S->IsOverload(Data.Method, MD, false)) 4097 return true; 4098 // Collect the overload only if its hidden. 4099 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4100 overloadedMethods.push_back(MD); 4101 } 4102 } 4103 4104 if (foundSameNameMethod) 4105 Data.OverloadedMethods.append(overloadedMethods.begin(), 4106 overloadedMethods.end()); 4107 return foundSameNameMethod; 4108} 4109 4110/// \brief See if a method overloads virtual methods in a base class without 4111/// overriding any. 4112void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4113 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4114 MD->getLocation()) == Diagnostic::Ignored) 4115 return; 4116 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4117 return; 4118 4119 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4120 /*bool RecordPaths=*/false, 4121 /*bool DetectVirtual=*/false); 4122 FindHiddenVirtualMethodData Data; 4123 Data.Method = MD; 4124 Data.S = this; 4125 4126 // Keep the base methods that were overriden or introduced in the subclass 4127 // by 'using' in a set. A base method not in this set is hidden. 4128 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4129 res.first != res.second; ++res.first) { 4130 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4131 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4132 E = MD->end_overridden_methods(); 4133 I != E; ++I) 4134 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4135 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4136 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4137 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4138 } 4139 4140 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4141 !Data.OverloadedMethods.empty()) { 4142 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4143 << MD << (Data.OverloadedMethods.size() > 1); 4144 4145 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4146 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4147 Diag(overloadedMD->getLocation(), 4148 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4149 } 4150 } 4151} 4152 4153void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4154 Decl *TagDecl, 4155 SourceLocation LBrac, 4156 SourceLocation RBrac, 4157 AttributeList *AttrList) { 4158 if (!TagDecl) 4159 return; 4160 4161 AdjustDeclIfTemplate(TagDecl); 4162 4163 ActOnFields(S, RLoc, TagDecl, 4164 // strict aliasing violation! 4165 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4166 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4167 4168 CheckCompletedCXXClass( 4169 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4170} 4171 4172/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4173/// special functions, such as the default constructor, copy 4174/// constructor, or destructor, to the given C++ class (C++ 4175/// [special]p1). This routine can only be executed just before the 4176/// definition of the class is complete. 4177void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4178 if (!ClassDecl->hasUserDeclaredConstructor()) 4179 ++ASTContext::NumImplicitDefaultConstructors; 4180 4181 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4182 ++ASTContext::NumImplicitCopyConstructors; 4183 4184 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4185 ++ASTContext::NumImplicitCopyAssignmentOperators; 4186 4187 // If we have a dynamic class, then the copy assignment operator may be 4188 // virtual, so we have to declare it immediately. This ensures that, e.g., 4189 // it shows up in the right place in the vtable and that we diagnose 4190 // problems with the implicit exception specification. 4191 if (ClassDecl->isDynamicClass()) 4192 DeclareImplicitCopyAssignment(ClassDecl); 4193 } 4194 4195 if (!ClassDecl->hasUserDeclaredDestructor()) { 4196 ++ASTContext::NumImplicitDestructors; 4197 4198 // If we have a dynamic class, then the destructor may be virtual, so we 4199 // have to declare the destructor immediately. This ensures that, e.g., it 4200 // shows up in the right place in the vtable and that we diagnose problems 4201 // with the implicit exception specification. 4202 if (ClassDecl->isDynamicClass()) 4203 DeclareImplicitDestructor(ClassDecl); 4204 } 4205} 4206 4207void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4208 if (!D) 4209 return; 4210 4211 int NumParamList = D->getNumTemplateParameterLists(); 4212 for (int i = 0; i < NumParamList; i++) { 4213 TemplateParameterList* Params = D->getTemplateParameterList(i); 4214 for (TemplateParameterList::iterator Param = Params->begin(), 4215 ParamEnd = Params->end(); 4216 Param != ParamEnd; ++Param) { 4217 NamedDecl *Named = cast<NamedDecl>(*Param); 4218 if (Named->getDeclName()) { 4219 S->AddDecl(Named); 4220 IdResolver.AddDecl(Named); 4221 } 4222 } 4223 } 4224} 4225 4226void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4227 if (!D) 4228 return; 4229 4230 TemplateParameterList *Params = 0; 4231 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4232 Params = Template->getTemplateParameters(); 4233 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4234 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4235 Params = PartialSpec->getTemplateParameters(); 4236 else 4237 return; 4238 4239 for (TemplateParameterList::iterator Param = Params->begin(), 4240 ParamEnd = Params->end(); 4241 Param != ParamEnd; ++Param) { 4242 NamedDecl *Named = cast<NamedDecl>(*Param); 4243 if (Named->getDeclName()) { 4244 S->AddDecl(Named); 4245 IdResolver.AddDecl(Named); 4246 } 4247 } 4248} 4249 4250void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4251 if (!RecordD) return; 4252 AdjustDeclIfTemplate(RecordD); 4253 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4254 PushDeclContext(S, Record); 4255} 4256 4257void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4258 if (!RecordD) return; 4259 PopDeclContext(); 4260} 4261 4262/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4263/// parsing a top-level (non-nested) C++ class, and we are now 4264/// parsing those parts of the given Method declaration that could 4265/// not be parsed earlier (C++ [class.mem]p2), such as default 4266/// arguments. This action should enter the scope of the given 4267/// Method declaration as if we had just parsed the qualified method 4268/// name. However, it should not bring the parameters into scope; 4269/// that will be performed by ActOnDelayedCXXMethodParameter. 4270void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4271} 4272 4273/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4274/// C++ method declaration. We're (re-)introducing the given 4275/// function parameter into scope for use in parsing later parts of 4276/// the method declaration. For example, we could see an 4277/// ActOnParamDefaultArgument event for this parameter. 4278void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4279 if (!ParamD) 4280 return; 4281 4282 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4283 4284 // If this parameter has an unparsed default argument, clear it out 4285 // to make way for the parsed default argument. 4286 if (Param->hasUnparsedDefaultArg()) 4287 Param->setDefaultArg(0); 4288 4289 S->AddDecl(Param); 4290 if (Param->getDeclName()) 4291 IdResolver.AddDecl(Param); 4292} 4293 4294/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4295/// processing the delayed method declaration for Method. The method 4296/// declaration is now considered finished. There may be a separate 4297/// ActOnStartOfFunctionDef action later (not necessarily 4298/// immediately!) for this method, if it was also defined inside the 4299/// class body. 4300void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4301 if (!MethodD) 4302 return; 4303 4304 AdjustDeclIfTemplate(MethodD); 4305 4306 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4307 4308 // Now that we have our default arguments, check the constructor 4309 // again. It could produce additional diagnostics or affect whether 4310 // the class has implicitly-declared destructors, among other 4311 // things. 4312 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4313 CheckConstructor(Constructor); 4314 4315 // Check the default arguments, which we may have added. 4316 if (!Method->isInvalidDecl()) 4317 CheckCXXDefaultArguments(Method); 4318} 4319 4320/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4321/// the well-formedness of the constructor declarator @p D with type @p 4322/// R. If there are any errors in the declarator, this routine will 4323/// emit diagnostics and set the invalid bit to true. In any case, the type 4324/// will be updated to reflect a well-formed type for the constructor and 4325/// returned. 4326QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4327 StorageClass &SC) { 4328 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4329 4330 // C++ [class.ctor]p3: 4331 // A constructor shall not be virtual (10.3) or static (9.4). A 4332 // constructor can be invoked for a const, volatile or const 4333 // volatile object. A constructor shall not be declared const, 4334 // volatile, or const volatile (9.3.2). 4335 if (isVirtual) { 4336 if (!D.isInvalidType()) 4337 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4338 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4339 << SourceRange(D.getIdentifierLoc()); 4340 D.setInvalidType(); 4341 } 4342 if (SC == SC_Static) { 4343 if (!D.isInvalidType()) 4344 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4345 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4346 << SourceRange(D.getIdentifierLoc()); 4347 D.setInvalidType(); 4348 SC = SC_None; 4349 } 4350 4351 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4352 if (FTI.TypeQuals != 0) { 4353 if (FTI.TypeQuals & Qualifiers::Const) 4354 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4355 << "const" << SourceRange(D.getIdentifierLoc()); 4356 if (FTI.TypeQuals & Qualifiers::Volatile) 4357 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4358 << "volatile" << SourceRange(D.getIdentifierLoc()); 4359 if (FTI.TypeQuals & Qualifiers::Restrict) 4360 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4361 << "restrict" << SourceRange(D.getIdentifierLoc()); 4362 D.setInvalidType(); 4363 } 4364 4365 // C++0x [class.ctor]p4: 4366 // A constructor shall not be declared with a ref-qualifier. 4367 if (FTI.hasRefQualifier()) { 4368 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4369 << FTI.RefQualifierIsLValueRef 4370 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4371 D.setInvalidType(); 4372 } 4373 4374 // Rebuild the function type "R" without any type qualifiers (in 4375 // case any of the errors above fired) and with "void" as the 4376 // return type, since constructors don't have return types. 4377 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4378 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4379 return R; 4380 4381 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4382 EPI.TypeQuals = 0; 4383 EPI.RefQualifier = RQ_None; 4384 4385 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4386 Proto->getNumArgs(), EPI); 4387} 4388 4389/// CheckConstructor - Checks a fully-formed constructor for 4390/// well-formedness, issuing any diagnostics required. Returns true if 4391/// the constructor declarator is invalid. 4392void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4393 CXXRecordDecl *ClassDecl 4394 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4395 if (!ClassDecl) 4396 return Constructor->setInvalidDecl(); 4397 4398 // C++ [class.copy]p3: 4399 // A declaration of a constructor for a class X is ill-formed if 4400 // its first parameter is of type (optionally cv-qualified) X and 4401 // either there are no other parameters or else all other 4402 // parameters have default arguments. 4403 if (!Constructor->isInvalidDecl() && 4404 ((Constructor->getNumParams() == 1) || 4405 (Constructor->getNumParams() > 1 && 4406 Constructor->getParamDecl(1)->hasDefaultArg())) && 4407 Constructor->getTemplateSpecializationKind() 4408 != TSK_ImplicitInstantiation) { 4409 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4410 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4411 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4412 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4413 const char *ConstRef 4414 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4415 : " const &"; 4416 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4417 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4418 4419 // FIXME: Rather that making the constructor invalid, we should endeavor 4420 // to fix the type. 4421 Constructor->setInvalidDecl(); 4422 } 4423 } 4424} 4425 4426/// CheckDestructor - Checks a fully-formed destructor definition for 4427/// well-formedness, issuing any diagnostics required. Returns true 4428/// on error. 4429bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4430 CXXRecordDecl *RD = Destructor->getParent(); 4431 4432 if (Destructor->isVirtual()) { 4433 SourceLocation Loc; 4434 4435 if (!Destructor->isImplicit()) 4436 Loc = Destructor->getLocation(); 4437 else 4438 Loc = RD->getLocation(); 4439 4440 // If we have a virtual destructor, look up the deallocation function 4441 FunctionDecl *OperatorDelete = 0; 4442 DeclarationName Name = 4443 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4444 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4445 return true; 4446 4447 MarkDeclarationReferenced(Loc, OperatorDelete); 4448 4449 Destructor->setOperatorDelete(OperatorDelete); 4450 } 4451 4452 return false; 4453} 4454 4455static inline bool 4456FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4457 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4458 FTI.ArgInfo[0].Param && 4459 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4460} 4461 4462/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4463/// the well-formednes of the destructor declarator @p D with type @p 4464/// R. If there are any errors in the declarator, this routine will 4465/// emit diagnostics and set the declarator to invalid. Even if this happens, 4466/// will be updated to reflect a well-formed type for the destructor and 4467/// returned. 4468QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4469 StorageClass& SC) { 4470 // C++ [class.dtor]p1: 4471 // [...] A typedef-name that names a class is a class-name 4472 // (7.1.3); however, a typedef-name that names a class shall not 4473 // be used as the identifier in the declarator for a destructor 4474 // declaration. 4475 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4476 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4477 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4478 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4479 else if (const TemplateSpecializationType *TST = 4480 DeclaratorType->getAs<TemplateSpecializationType>()) 4481 if (TST->isTypeAlias()) 4482 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4483 << DeclaratorType << 1; 4484 4485 // C++ [class.dtor]p2: 4486 // A destructor is used to destroy objects of its class type. A 4487 // destructor takes no parameters, and no return type can be 4488 // specified for it (not even void). The address of a destructor 4489 // shall not be taken. A destructor shall not be static. A 4490 // destructor can be invoked for a const, volatile or const 4491 // volatile object. A destructor shall not be declared const, 4492 // volatile or const volatile (9.3.2). 4493 if (SC == SC_Static) { 4494 if (!D.isInvalidType()) 4495 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4496 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4497 << SourceRange(D.getIdentifierLoc()) 4498 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4499 4500 SC = SC_None; 4501 } 4502 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4503 // Destructors don't have return types, but the parser will 4504 // happily parse something like: 4505 // 4506 // class X { 4507 // float ~X(); 4508 // }; 4509 // 4510 // The return type will be eliminated later. 4511 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4512 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4513 << SourceRange(D.getIdentifierLoc()); 4514 } 4515 4516 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4517 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4518 if (FTI.TypeQuals & Qualifiers::Const) 4519 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4520 << "const" << SourceRange(D.getIdentifierLoc()); 4521 if (FTI.TypeQuals & Qualifiers::Volatile) 4522 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4523 << "volatile" << SourceRange(D.getIdentifierLoc()); 4524 if (FTI.TypeQuals & Qualifiers::Restrict) 4525 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4526 << "restrict" << SourceRange(D.getIdentifierLoc()); 4527 D.setInvalidType(); 4528 } 4529 4530 // C++0x [class.dtor]p2: 4531 // A destructor shall not be declared with a ref-qualifier. 4532 if (FTI.hasRefQualifier()) { 4533 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4534 << FTI.RefQualifierIsLValueRef 4535 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4536 D.setInvalidType(); 4537 } 4538 4539 // Make sure we don't have any parameters. 4540 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4541 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4542 4543 // Delete the parameters. 4544 FTI.freeArgs(); 4545 D.setInvalidType(); 4546 } 4547 4548 // Make sure the destructor isn't variadic. 4549 if (FTI.isVariadic) { 4550 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4551 D.setInvalidType(); 4552 } 4553 4554 // Rebuild the function type "R" without any type qualifiers or 4555 // parameters (in case any of the errors above fired) and with 4556 // "void" as the return type, since destructors don't have return 4557 // types. 4558 if (!D.isInvalidType()) 4559 return R; 4560 4561 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4562 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4563 EPI.Variadic = false; 4564 EPI.TypeQuals = 0; 4565 EPI.RefQualifier = RQ_None; 4566 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4567} 4568 4569/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4570/// well-formednes of the conversion function declarator @p D with 4571/// type @p R. If there are any errors in the declarator, this routine 4572/// will emit diagnostics and return true. Otherwise, it will return 4573/// false. Either way, the type @p R will be updated to reflect a 4574/// well-formed type for the conversion operator. 4575void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4576 StorageClass& SC) { 4577 // C++ [class.conv.fct]p1: 4578 // Neither parameter types nor return type can be specified. The 4579 // type of a conversion function (8.3.5) is "function taking no 4580 // parameter returning conversion-type-id." 4581 if (SC == SC_Static) { 4582 if (!D.isInvalidType()) 4583 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4584 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4585 << SourceRange(D.getIdentifierLoc()); 4586 D.setInvalidType(); 4587 SC = SC_None; 4588 } 4589 4590 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4591 4592 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4593 // Conversion functions don't have return types, but the parser will 4594 // happily parse something like: 4595 // 4596 // class X { 4597 // float operator bool(); 4598 // }; 4599 // 4600 // The return type will be changed later anyway. 4601 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4602 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4603 << SourceRange(D.getIdentifierLoc()); 4604 D.setInvalidType(); 4605 } 4606 4607 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4608 4609 // Make sure we don't have any parameters. 4610 if (Proto->getNumArgs() > 0) { 4611 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4612 4613 // Delete the parameters. 4614 D.getFunctionTypeInfo().freeArgs(); 4615 D.setInvalidType(); 4616 } else if (Proto->isVariadic()) { 4617 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4618 D.setInvalidType(); 4619 } 4620 4621 // Diagnose "&operator bool()" and other such nonsense. This 4622 // is actually a gcc extension which we don't support. 4623 if (Proto->getResultType() != ConvType) { 4624 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4625 << Proto->getResultType(); 4626 D.setInvalidType(); 4627 ConvType = Proto->getResultType(); 4628 } 4629 4630 // C++ [class.conv.fct]p4: 4631 // The conversion-type-id shall not represent a function type nor 4632 // an array type. 4633 if (ConvType->isArrayType()) { 4634 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4635 ConvType = Context.getPointerType(ConvType); 4636 D.setInvalidType(); 4637 } else if (ConvType->isFunctionType()) { 4638 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4639 ConvType = Context.getPointerType(ConvType); 4640 D.setInvalidType(); 4641 } 4642 4643 // Rebuild the function type "R" without any parameters (in case any 4644 // of the errors above fired) and with the conversion type as the 4645 // return type. 4646 if (D.isInvalidType()) 4647 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4648 4649 // C++0x explicit conversion operators. 4650 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4651 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4652 diag::warn_explicit_conversion_functions) 4653 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4654} 4655 4656/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4657/// the declaration of the given C++ conversion function. This routine 4658/// is responsible for recording the conversion function in the C++ 4659/// class, if possible. 4660Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4661 assert(Conversion && "Expected to receive a conversion function declaration"); 4662 4663 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4664 4665 // Make sure we aren't redeclaring the conversion function. 4666 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4667 4668 // C++ [class.conv.fct]p1: 4669 // [...] A conversion function is never used to convert a 4670 // (possibly cv-qualified) object to the (possibly cv-qualified) 4671 // same object type (or a reference to it), to a (possibly 4672 // cv-qualified) base class of that type (or a reference to it), 4673 // or to (possibly cv-qualified) void. 4674 // FIXME: Suppress this warning if the conversion function ends up being a 4675 // virtual function that overrides a virtual function in a base class. 4676 QualType ClassType 4677 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4678 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4679 ConvType = ConvTypeRef->getPointeeType(); 4680 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4681 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4682 /* Suppress diagnostics for instantiations. */; 4683 else if (ConvType->isRecordType()) { 4684 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4685 if (ConvType == ClassType) 4686 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4687 << ClassType; 4688 else if (IsDerivedFrom(ClassType, ConvType)) 4689 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4690 << ClassType << ConvType; 4691 } else if (ConvType->isVoidType()) { 4692 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4693 << ClassType << ConvType; 4694 } 4695 4696 if (FunctionTemplateDecl *ConversionTemplate 4697 = Conversion->getDescribedFunctionTemplate()) 4698 return ConversionTemplate; 4699 4700 return Conversion; 4701} 4702 4703//===----------------------------------------------------------------------===// 4704// Namespace Handling 4705//===----------------------------------------------------------------------===// 4706 4707 4708 4709/// ActOnStartNamespaceDef - This is called at the start of a namespace 4710/// definition. 4711Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4712 SourceLocation InlineLoc, 4713 SourceLocation NamespaceLoc, 4714 SourceLocation IdentLoc, 4715 IdentifierInfo *II, 4716 SourceLocation LBrace, 4717 AttributeList *AttrList) { 4718 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4719 // For anonymous namespace, take the location of the left brace. 4720 SourceLocation Loc = II ? IdentLoc : LBrace; 4721 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4722 StartLoc, Loc, II); 4723 Namespc->setInline(InlineLoc.isValid()); 4724 4725 Scope *DeclRegionScope = NamespcScope->getParent(); 4726 4727 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4728 4729 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4730 PushNamespaceVisibilityAttr(Attr); 4731 4732 if (II) { 4733 // C++ [namespace.def]p2: 4734 // The identifier in an original-namespace-definition shall not 4735 // have been previously defined in the declarative region in 4736 // which the original-namespace-definition appears. The 4737 // identifier in an original-namespace-definition is the name of 4738 // the namespace. Subsequently in that declarative region, it is 4739 // treated as an original-namespace-name. 4740 // 4741 // Since namespace names are unique in their scope, and we don't 4742 // look through using directives, just look for any ordinary names. 4743 4744 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4745 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4746 Decl::IDNS_Namespace; 4747 NamedDecl *PrevDecl = 0; 4748 for (DeclContext::lookup_result R 4749 = CurContext->getRedeclContext()->lookup(II); 4750 R.first != R.second; ++R.first) { 4751 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4752 PrevDecl = *R.first; 4753 break; 4754 } 4755 } 4756 4757 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4758 // This is an extended namespace definition. 4759 if (Namespc->isInline() != OrigNS->isInline()) { 4760 // inline-ness must match 4761 if (OrigNS->isInline()) { 4762 // The user probably just forgot the 'inline', so suggest that it 4763 // be added back. 4764 Diag(Namespc->getLocation(), 4765 diag::warn_inline_namespace_reopened_noninline) 4766 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4767 } else { 4768 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4769 << Namespc->isInline(); 4770 } 4771 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4772 4773 // Recover by ignoring the new namespace's inline status. 4774 Namespc->setInline(OrigNS->isInline()); 4775 } 4776 4777 // Attach this namespace decl to the chain of extended namespace 4778 // definitions. 4779 OrigNS->setNextNamespace(Namespc); 4780 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4781 4782 // Remove the previous declaration from the scope. 4783 if (DeclRegionScope->isDeclScope(OrigNS)) { 4784 IdResolver.RemoveDecl(OrigNS); 4785 DeclRegionScope->RemoveDecl(OrigNS); 4786 } 4787 } else if (PrevDecl) { 4788 // This is an invalid name redefinition. 4789 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4790 << Namespc->getDeclName(); 4791 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4792 Namespc->setInvalidDecl(); 4793 // Continue on to push Namespc as current DeclContext and return it. 4794 } else if (II->isStr("std") && 4795 CurContext->getRedeclContext()->isTranslationUnit()) { 4796 // This is the first "real" definition of the namespace "std", so update 4797 // our cache of the "std" namespace to point at this definition. 4798 if (NamespaceDecl *StdNS = getStdNamespace()) { 4799 // We had already defined a dummy namespace "std". Link this new 4800 // namespace definition to the dummy namespace "std". 4801 StdNS->setNextNamespace(Namespc); 4802 StdNS->setLocation(IdentLoc); 4803 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4804 } 4805 4806 // Make our StdNamespace cache point at the first real definition of the 4807 // "std" namespace. 4808 StdNamespace = Namespc; 4809 } 4810 4811 PushOnScopeChains(Namespc, DeclRegionScope); 4812 } else { 4813 // Anonymous namespaces. 4814 assert(Namespc->isAnonymousNamespace()); 4815 4816 // Link the anonymous namespace into its parent. 4817 NamespaceDecl *PrevDecl; 4818 DeclContext *Parent = CurContext->getRedeclContext(); 4819 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4820 PrevDecl = TU->getAnonymousNamespace(); 4821 TU->setAnonymousNamespace(Namespc); 4822 } else { 4823 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4824 PrevDecl = ND->getAnonymousNamespace(); 4825 ND->setAnonymousNamespace(Namespc); 4826 } 4827 4828 // Link the anonymous namespace with its previous declaration. 4829 if (PrevDecl) { 4830 assert(PrevDecl->isAnonymousNamespace()); 4831 assert(!PrevDecl->getNextNamespace()); 4832 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4833 PrevDecl->setNextNamespace(Namespc); 4834 4835 if (Namespc->isInline() != PrevDecl->isInline()) { 4836 // inline-ness must match 4837 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4838 << Namespc->isInline(); 4839 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4840 Namespc->setInvalidDecl(); 4841 // Recover by ignoring the new namespace's inline status. 4842 Namespc->setInline(PrevDecl->isInline()); 4843 } 4844 } 4845 4846 CurContext->addDecl(Namespc); 4847 4848 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4849 // behaves as if it were replaced by 4850 // namespace unique { /* empty body */ } 4851 // using namespace unique; 4852 // namespace unique { namespace-body } 4853 // where all occurrences of 'unique' in a translation unit are 4854 // replaced by the same identifier and this identifier differs 4855 // from all other identifiers in the entire program. 4856 4857 // We just create the namespace with an empty name and then add an 4858 // implicit using declaration, just like the standard suggests. 4859 // 4860 // CodeGen enforces the "universally unique" aspect by giving all 4861 // declarations semantically contained within an anonymous 4862 // namespace internal linkage. 4863 4864 if (!PrevDecl) { 4865 UsingDirectiveDecl* UD 4866 = UsingDirectiveDecl::Create(Context, CurContext, 4867 /* 'using' */ LBrace, 4868 /* 'namespace' */ SourceLocation(), 4869 /* qualifier */ NestedNameSpecifierLoc(), 4870 /* identifier */ SourceLocation(), 4871 Namespc, 4872 /* Ancestor */ CurContext); 4873 UD->setImplicit(); 4874 CurContext->addDecl(UD); 4875 } 4876 } 4877 4878 // Although we could have an invalid decl (i.e. the namespace name is a 4879 // redefinition), push it as current DeclContext and try to continue parsing. 4880 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4881 // for the namespace has the declarations that showed up in that particular 4882 // namespace definition. 4883 PushDeclContext(NamespcScope, Namespc); 4884 return Namespc; 4885} 4886 4887/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4888/// is a namespace alias, returns the namespace it points to. 4889static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4890 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4891 return AD->getNamespace(); 4892 return dyn_cast_or_null<NamespaceDecl>(D); 4893} 4894 4895/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4896/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4897void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4898 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4899 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4900 Namespc->setRBraceLoc(RBrace); 4901 PopDeclContext(); 4902 if (Namespc->hasAttr<VisibilityAttr>()) 4903 PopPragmaVisibility(); 4904} 4905 4906CXXRecordDecl *Sema::getStdBadAlloc() const { 4907 return cast_or_null<CXXRecordDecl>( 4908 StdBadAlloc.get(Context.getExternalSource())); 4909} 4910 4911NamespaceDecl *Sema::getStdNamespace() const { 4912 return cast_or_null<NamespaceDecl>( 4913 StdNamespace.get(Context.getExternalSource())); 4914} 4915 4916/// \brief Retrieve the special "std" namespace, which may require us to 4917/// implicitly define the namespace. 4918NamespaceDecl *Sema::getOrCreateStdNamespace() { 4919 if (!StdNamespace) { 4920 // The "std" namespace has not yet been defined, so build one implicitly. 4921 StdNamespace = NamespaceDecl::Create(Context, 4922 Context.getTranslationUnitDecl(), 4923 SourceLocation(), SourceLocation(), 4924 &PP.getIdentifierTable().get("std")); 4925 getStdNamespace()->setImplicit(true); 4926 } 4927 4928 return getStdNamespace(); 4929} 4930 4931/// \brief Determine whether a using statement is in a context where it will be 4932/// apply in all contexts. 4933static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4934 switch (CurContext->getDeclKind()) { 4935 case Decl::TranslationUnit: 4936 return true; 4937 case Decl::LinkageSpec: 4938 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4939 default: 4940 return false; 4941 } 4942} 4943 4944Decl *Sema::ActOnUsingDirective(Scope *S, 4945 SourceLocation UsingLoc, 4946 SourceLocation NamespcLoc, 4947 CXXScopeSpec &SS, 4948 SourceLocation IdentLoc, 4949 IdentifierInfo *NamespcName, 4950 AttributeList *AttrList) { 4951 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4952 assert(NamespcName && "Invalid NamespcName."); 4953 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4954 4955 // This can only happen along a recovery path. 4956 while (S->getFlags() & Scope::TemplateParamScope) 4957 S = S->getParent(); 4958 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4959 4960 UsingDirectiveDecl *UDir = 0; 4961 NestedNameSpecifier *Qualifier = 0; 4962 if (SS.isSet()) 4963 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4964 4965 // Lookup namespace name. 4966 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4967 LookupParsedName(R, S, &SS); 4968 if (R.isAmbiguous()) 4969 return 0; 4970 4971 if (R.empty()) { 4972 // Allow "using namespace std;" or "using namespace ::std;" even if 4973 // "std" hasn't been defined yet, for GCC compatibility. 4974 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4975 NamespcName->isStr("std")) { 4976 Diag(IdentLoc, diag::ext_using_undefined_std); 4977 R.addDecl(getOrCreateStdNamespace()); 4978 R.resolveKind(); 4979 } 4980 // Otherwise, attempt typo correction. 4981 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4982 CTC_NoKeywords, 0)) { 4983 if (R.getAsSingle<NamespaceDecl>() || 4984 R.getAsSingle<NamespaceAliasDecl>()) { 4985 if (DeclContext *DC = computeDeclContext(SS, false)) 4986 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4987 << NamespcName << DC << Corrected << SS.getRange() 4988 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4989 else 4990 Diag(IdentLoc, diag::err_using_directive_suggest) 4991 << NamespcName << Corrected 4992 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4993 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4994 << Corrected; 4995 4996 NamespcName = Corrected.getAsIdentifierInfo(); 4997 } else { 4998 R.clear(); 4999 R.setLookupName(NamespcName); 5000 } 5001 } 5002 } 5003 5004 if (!R.empty()) { 5005 NamedDecl *Named = R.getFoundDecl(); 5006 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5007 && "expected namespace decl"); 5008 // C++ [namespace.udir]p1: 5009 // A using-directive specifies that the names in the nominated 5010 // namespace can be used in the scope in which the 5011 // using-directive appears after the using-directive. During 5012 // unqualified name lookup (3.4.1), the names appear as if they 5013 // were declared in the nearest enclosing namespace which 5014 // contains both the using-directive and the nominated 5015 // namespace. [Note: in this context, "contains" means "contains 5016 // directly or indirectly". ] 5017 5018 // Find enclosing context containing both using-directive and 5019 // nominated namespace. 5020 NamespaceDecl *NS = getNamespaceDecl(Named); 5021 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5022 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5023 CommonAncestor = CommonAncestor->getParent(); 5024 5025 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5026 SS.getWithLocInContext(Context), 5027 IdentLoc, Named, CommonAncestor); 5028 5029 if (IsUsingDirectiveInToplevelContext(CurContext) && 5030 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 5031 Diag(IdentLoc, diag::warn_using_directive_in_header); 5032 } 5033 5034 PushUsingDirective(S, UDir); 5035 } else { 5036 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5037 } 5038 5039 // FIXME: We ignore attributes for now. 5040 return UDir; 5041} 5042 5043void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5044 // If scope has associated entity, then using directive is at namespace 5045 // or translation unit scope. We add UsingDirectiveDecls, into 5046 // it's lookup structure. 5047 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5048 Ctx->addDecl(UDir); 5049 else 5050 // Otherwise it is block-sope. using-directives will affect lookup 5051 // only to the end of scope. 5052 S->PushUsingDirective(UDir); 5053} 5054 5055 5056Decl *Sema::ActOnUsingDeclaration(Scope *S, 5057 AccessSpecifier AS, 5058 bool HasUsingKeyword, 5059 SourceLocation UsingLoc, 5060 CXXScopeSpec &SS, 5061 UnqualifiedId &Name, 5062 AttributeList *AttrList, 5063 bool IsTypeName, 5064 SourceLocation TypenameLoc) { 5065 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5066 5067 switch (Name.getKind()) { 5068 case UnqualifiedId::IK_Identifier: 5069 case UnqualifiedId::IK_OperatorFunctionId: 5070 case UnqualifiedId::IK_LiteralOperatorId: 5071 case UnqualifiedId::IK_ConversionFunctionId: 5072 break; 5073 5074 case UnqualifiedId::IK_ConstructorName: 5075 case UnqualifiedId::IK_ConstructorTemplateId: 5076 // C++0x inherited constructors. 5077 if (getLangOptions().CPlusPlus0x) break; 5078 5079 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5080 << SS.getRange(); 5081 return 0; 5082 5083 case UnqualifiedId::IK_DestructorName: 5084 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5085 << SS.getRange(); 5086 return 0; 5087 5088 case UnqualifiedId::IK_TemplateId: 5089 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5090 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5091 return 0; 5092 } 5093 5094 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5095 DeclarationName TargetName = TargetNameInfo.getName(); 5096 if (!TargetName) 5097 return 0; 5098 5099 // Warn about using declarations. 5100 // TODO: store that the declaration was written without 'using' and 5101 // talk about access decls instead of using decls in the 5102 // diagnostics. 5103 if (!HasUsingKeyword) { 5104 UsingLoc = Name.getSourceRange().getBegin(); 5105 5106 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5107 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5108 } 5109 5110 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5111 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5112 return 0; 5113 5114 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5115 TargetNameInfo, AttrList, 5116 /* IsInstantiation */ false, 5117 IsTypeName, TypenameLoc); 5118 if (UD) 5119 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5120 5121 return UD; 5122} 5123 5124/// \brief Determine whether a using declaration considers the given 5125/// declarations as "equivalent", e.g., if they are redeclarations of 5126/// the same entity or are both typedefs of the same type. 5127static bool 5128IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5129 bool &SuppressRedeclaration) { 5130 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5131 SuppressRedeclaration = false; 5132 return true; 5133 } 5134 5135 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5136 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5137 SuppressRedeclaration = true; 5138 return Context.hasSameType(TD1->getUnderlyingType(), 5139 TD2->getUnderlyingType()); 5140 } 5141 5142 return false; 5143} 5144 5145 5146/// Determines whether to create a using shadow decl for a particular 5147/// decl, given the set of decls existing prior to this using lookup. 5148bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5149 const LookupResult &Previous) { 5150 // Diagnose finding a decl which is not from a base class of the 5151 // current class. We do this now because there are cases where this 5152 // function will silently decide not to build a shadow decl, which 5153 // will pre-empt further diagnostics. 5154 // 5155 // We don't need to do this in C++0x because we do the check once on 5156 // the qualifier. 5157 // 5158 // FIXME: diagnose the following if we care enough: 5159 // struct A { int foo; }; 5160 // struct B : A { using A::foo; }; 5161 // template <class T> struct C : A {}; 5162 // template <class T> struct D : C<T> { using B::foo; } // <--- 5163 // This is invalid (during instantiation) in C++03 because B::foo 5164 // resolves to the using decl in B, which is not a base class of D<T>. 5165 // We can't diagnose it immediately because C<T> is an unknown 5166 // specialization. The UsingShadowDecl in D<T> then points directly 5167 // to A::foo, which will look well-formed when we instantiate. 5168 // The right solution is to not collapse the shadow-decl chain. 5169 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5170 DeclContext *OrigDC = Orig->getDeclContext(); 5171 5172 // Handle enums and anonymous structs. 5173 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5174 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5175 while (OrigRec->isAnonymousStructOrUnion()) 5176 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5177 5178 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5179 if (OrigDC == CurContext) { 5180 Diag(Using->getLocation(), 5181 diag::err_using_decl_nested_name_specifier_is_current_class) 5182 << Using->getQualifierLoc().getSourceRange(); 5183 Diag(Orig->getLocation(), diag::note_using_decl_target); 5184 return true; 5185 } 5186 5187 Diag(Using->getQualifierLoc().getBeginLoc(), 5188 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5189 << Using->getQualifier() 5190 << cast<CXXRecordDecl>(CurContext) 5191 << Using->getQualifierLoc().getSourceRange(); 5192 Diag(Orig->getLocation(), diag::note_using_decl_target); 5193 return true; 5194 } 5195 } 5196 5197 if (Previous.empty()) return false; 5198 5199 NamedDecl *Target = Orig; 5200 if (isa<UsingShadowDecl>(Target)) 5201 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5202 5203 // If the target happens to be one of the previous declarations, we 5204 // don't have a conflict. 5205 // 5206 // FIXME: but we might be increasing its access, in which case we 5207 // should redeclare it. 5208 NamedDecl *NonTag = 0, *Tag = 0; 5209 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5210 I != E; ++I) { 5211 NamedDecl *D = (*I)->getUnderlyingDecl(); 5212 bool Result; 5213 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5214 return Result; 5215 5216 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5217 } 5218 5219 if (Target->isFunctionOrFunctionTemplate()) { 5220 FunctionDecl *FD; 5221 if (isa<FunctionTemplateDecl>(Target)) 5222 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5223 else 5224 FD = cast<FunctionDecl>(Target); 5225 5226 NamedDecl *OldDecl = 0; 5227 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5228 case Ovl_Overload: 5229 return false; 5230 5231 case Ovl_NonFunction: 5232 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5233 break; 5234 5235 // We found a decl with the exact signature. 5236 case Ovl_Match: 5237 // If we're in a record, we want to hide the target, so we 5238 // return true (without a diagnostic) to tell the caller not to 5239 // build a shadow decl. 5240 if (CurContext->isRecord()) 5241 return true; 5242 5243 // If we're not in a record, this is an error. 5244 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5245 break; 5246 } 5247 5248 Diag(Target->getLocation(), diag::note_using_decl_target); 5249 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5250 return true; 5251 } 5252 5253 // Target is not a function. 5254 5255 if (isa<TagDecl>(Target)) { 5256 // No conflict between a tag and a non-tag. 5257 if (!Tag) return false; 5258 5259 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5260 Diag(Target->getLocation(), diag::note_using_decl_target); 5261 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5262 return true; 5263 } 5264 5265 // No conflict between a tag and a non-tag. 5266 if (!NonTag) return false; 5267 5268 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5269 Diag(Target->getLocation(), diag::note_using_decl_target); 5270 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5271 return true; 5272} 5273 5274/// Builds a shadow declaration corresponding to a 'using' declaration. 5275UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5276 UsingDecl *UD, 5277 NamedDecl *Orig) { 5278 5279 // If we resolved to another shadow declaration, just coalesce them. 5280 NamedDecl *Target = Orig; 5281 if (isa<UsingShadowDecl>(Target)) { 5282 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5283 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5284 } 5285 5286 UsingShadowDecl *Shadow 5287 = UsingShadowDecl::Create(Context, CurContext, 5288 UD->getLocation(), UD, Target); 5289 UD->addShadowDecl(Shadow); 5290 5291 Shadow->setAccess(UD->getAccess()); 5292 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5293 Shadow->setInvalidDecl(); 5294 5295 if (S) 5296 PushOnScopeChains(Shadow, S); 5297 else 5298 CurContext->addDecl(Shadow); 5299 5300 5301 return Shadow; 5302} 5303 5304/// Hides a using shadow declaration. This is required by the current 5305/// using-decl implementation when a resolvable using declaration in a 5306/// class is followed by a declaration which would hide or override 5307/// one or more of the using decl's targets; for example: 5308/// 5309/// struct Base { void foo(int); }; 5310/// struct Derived : Base { 5311/// using Base::foo; 5312/// void foo(int); 5313/// }; 5314/// 5315/// The governing language is C++03 [namespace.udecl]p12: 5316/// 5317/// When a using-declaration brings names from a base class into a 5318/// derived class scope, member functions in the derived class 5319/// override and/or hide member functions with the same name and 5320/// parameter types in a base class (rather than conflicting). 5321/// 5322/// There are two ways to implement this: 5323/// (1) optimistically create shadow decls when they're not hidden 5324/// by existing declarations, or 5325/// (2) don't create any shadow decls (or at least don't make them 5326/// visible) until we've fully parsed/instantiated the class. 5327/// The problem with (1) is that we might have to retroactively remove 5328/// a shadow decl, which requires several O(n) operations because the 5329/// decl structures are (very reasonably) not designed for removal. 5330/// (2) avoids this but is very fiddly and phase-dependent. 5331void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5332 if (Shadow->getDeclName().getNameKind() == 5333 DeclarationName::CXXConversionFunctionName) 5334 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5335 5336 // Remove it from the DeclContext... 5337 Shadow->getDeclContext()->removeDecl(Shadow); 5338 5339 // ...and the scope, if applicable... 5340 if (S) { 5341 S->RemoveDecl(Shadow); 5342 IdResolver.RemoveDecl(Shadow); 5343 } 5344 5345 // ...and the using decl. 5346 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5347 5348 // TODO: complain somehow if Shadow was used. It shouldn't 5349 // be possible for this to happen, because...? 5350} 5351 5352/// Builds a using declaration. 5353/// 5354/// \param IsInstantiation - Whether this call arises from an 5355/// instantiation of an unresolved using declaration. We treat 5356/// the lookup differently for these declarations. 5357NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5358 SourceLocation UsingLoc, 5359 CXXScopeSpec &SS, 5360 const DeclarationNameInfo &NameInfo, 5361 AttributeList *AttrList, 5362 bool IsInstantiation, 5363 bool IsTypeName, 5364 SourceLocation TypenameLoc) { 5365 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5366 SourceLocation IdentLoc = NameInfo.getLoc(); 5367 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5368 5369 // FIXME: We ignore attributes for now. 5370 5371 if (SS.isEmpty()) { 5372 Diag(IdentLoc, diag::err_using_requires_qualname); 5373 return 0; 5374 } 5375 5376 // Do the redeclaration lookup in the current scope. 5377 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5378 ForRedeclaration); 5379 Previous.setHideTags(false); 5380 if (S) { 5381 LookupName(Previous, S); 5382 5383 // It is really dumb that we have to do this. 5384 LookupResult::Filter F = Previous.makeFilter(); 5385 while (F.hasNext()) { 5386 NamedDecl *D = F.next(); 5387 if (!isDeclInScope(D, CurContext, S)) 5388 F.erase(); 5389 } 5390 F.done(); 5391 } else { 5392 assert(IsInstantiation && "no scope in non-instantiation"); 5393 assert(CurContext->isRecord() && "scope not record in instantiation"); 5394 LookupQualifiedName(Previous, CurContext); 5395 } 5396 5397 // Check for invalid redeclarations. 5398 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5399 return 0; 5400 5401 // Check for bad qualifiers. 5402 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5403 return 0; 5404 5405 DeclContext *LookupContext = computeDeclContext(SS); 5406 NamedDecl *D; 5407 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5408 if (!LookupContext) { 5409 if (IsTypeName) { 5410 // FIXME: not all declaration name kinds are legal here 5411 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5412 UsingLoc, TypenameLoc, 5413 QualifierLoc, 5414 IdentLoc, NameInfo.getName()); 5415 } else { 5416 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5417 QualifierLoc, NameInfo); 5418 } 5419 } else { 5420 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5421 NameInfo, IsTypeName); 5422 } 5423 D->setAccess(AS); 5424 CurContext->addDecl(D); 5425 5426 if (!LookupContext) return D; 5427 UsingDecl *UD = cast<UsingDecl>(D); 5428 5429 if (RequireCompleteDeclContext(SS, LookupContext)) { 5430 UD->setInvalidDecl(); 5431 return UD; 5432 } 5433 5434 // Constructor inheriting using decls get special treatment. 5435 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5436 if (CheckInheritedConstructorUsingDecl(UD)) 5437 UD->setInvalidDecl(); 5438 return UD; 5439 } 5440 5441 // Otherwise, look up the target name. 5442 5443 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5444 R.setUsingDeclaration(true); 5445 5446 // Unlike most lookups, we don't always want to hide tag 5447 // declarations: tag names are visible through the using declaration 5448 // even if hidden by ordinary names, *except* in a dependent context 5449 // where it's important for the sanity of two-phase lookup. 5450 if (!IsInstantiation) 5451 R.setHideTags(false); 5452 5453 LookupQualifiedName(R, LookupContext); 5454 5455 if (R.empty()) { 5456 Diag(IdentLoc, diag::err_no_member) 5457 << NameInfo.getName() << LookupContext << SS.getRange(); 5458 UD->setInvalidDecl(); 5459 return UD; 5460 } 5461 5462 if (R.isAmbiguous()) { 5463 UD->setInvalidDecl(); 5464 return UD; 5465 } 5466 5467 if (IsTypeName) { 5468 // If we asked for a typename and got a non-type decl, error out. 5469 if (!R.getAsSingle<TypeDecl>()) { 5470 Diag(IdentLoc, diag::err_using_typename_non_type); 5471 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5472 Diag((*I)->getUnderlyingDecl()->getLocation(), 5473 diag::note_using_decl_target); 5474 UD->setInvalidDecl(); 5475 return UD; 5476 } 5477 } else { 5478 // If we asked for a non-typename and we got a type, error out, 5479 // but only if this is an instantiation of an unresolved using 5480 // decl. Otherwise just silently find the type name. 5481 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5482 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5483 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5484 UD->setInvalidDecl(); 5485 return UD; 5486 } 5487 } 5488 5489 // C++0x N2914 [namespace.udecl]p6: 5490 // A using-declaration shall not name a namespace. 5491 if (R.getAsSingle<NamespaceDecl>()) { 5492 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5493 << SS.getRange(); 5494 UD->setInvalidDecl(); 5495 return UD; 5496 } 5497 5498 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5499 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5500 BuildUsingShadowDecl(S, UD, *I); 5501 } 5502 5503 return UD; 5504} 5505 5506/// Additional checks for a using declaration referring to a constructor name. 5507bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5508 if (UD->isTypeName()) { 5509 // FIXME: Cannot specify typename when specifying constructor 5510 return true; 5511 } 5512 5513 const Type *SourceType = UD->getQualifier()->getAsType(); 5514 assert(SourceType && 5515 "Using decl naming constructor doesn't have type in scope spec."); 5516 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5517 5518 // Check whether the named type is a direct base class. 5519 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5520 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5521 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5522 BaseIt != BaseE; ++BaseIt) { 5523 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5524 if (CanonicalSourceType == BaseType) 5525 break; 5526 } 5527 5528 if (BaseIt == BaseE) { 5529 // Did not find SourceType in the bases. 5530 Diag(UD->getUsingLocation(), 5531 diag::err_using_decl_constructor_not_in_direct_base) 5532 << UD->getNameInfo().getSourceRange() 5533 << QualType(SourceType, 0) << TargetClass; 5534 return true; 5535 } 5536 5537 BaseIt->setInheritConstructors(); 5538 5539 return false; 5540} 5541 5542/// Checks that the given using declaration is not an invalid 5543/// redeclaration. Note that this is checking only for the using decl 5544/// itself, not for any ill-formedness among the UsingShadowDecls. 5545bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5546 bool isTypeName, 5547 const CXXScopeSpec &SS, 5548 SourceLocation NameLoc, 5549 const LookupResult &Prev) { 5550 // C++03 [namespace.udecl]p8: 5551 // C++0x [namespace.udecl]p10: 5552 // A using-declaration is a declaration and can therefore be used 5553 // repeatedly where (and only where) multiple declarations are 5554 // allowed. 5555 // 5556 // That's in non-member contexts. 5557 if (!CurContext->getRedeclContext()->isRecord()) 5558 return false; 5559 5560 NestedNameSpecifier *Qual 5561 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5562 5563 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5564 NamedDecl *D = *I; 5565 5566 bool DTypename; 5567 NestedNameSpecifier *DQual; 5568 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5569 DTypename = UD->isTypeName(); 5570 DQual = UD->getQualifier(); 5571 } else if (UnresolvedUsingValueDecl *UD 5572 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5573 DTypename = false; 5574 DQual = UD->getQualifier(); 5575 } else if (UnresolvedUsingTypenameDecl *UD 5576 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5577 DTypename = true; 5578 DQual = UD->getQualifier(); 5579 } else continue; 5580 5581 // using decls differ if one says 'typename' and the other doesn't. 5582 // FIXME: non-dependent using decls? 5583 if (isTypeName != DTypename) continue; 5584 5585 // using decls differ if they name different scopes (but note that 5586 // template instantiation can cause this check to trigger when it 5587 // didn't before instantiation). 5588 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5589 Context.getCanonicalNestedNameSpecifier(DQual)) 5590 continue; 5591 5592 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5593 Diag(D->getLocation(), diag::note_using_decl) << 1; 5594 return true; 5595 } 5596 5597 return false; 5598} 5599 5600 5601/// Checks that the given nested-name qualifier used in a using decl 5602/// in the current context is appropriately related to the current 5603/// scope. If an error is found, diagnoses it and returns true. 5604bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5605 const CXXScopeSpec &SS, 5606 SourceLocation NameLoc) { 5607 DeclContext *NamedContext = computeDeclContext(SS); 5608 5609 if (!CurContext->isRecord()) { 5610 // C++03 [namespace.udecl]p3: 5611 // C++0x [namespace.udecl]p8: 5612 // A using-declaration for a class member shall be a member-declaration. 5613 5614 // If we weren't able to compute a valid scope, it must be a 5615 // dependent class scope. 5616 if (!NamedContext || NamedContext->isRecord()) { 5617 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5618 << SS.getRange(); 5619 return true; 5620 } 5621 5622 // Otherwise, everything is known to be fine. 5623 return false; 5624 } 5625 5626 // The current scope is a record. 5627 5628 // If the named context is dependent, we can't decide much. 5629 if (!NamedContext) { 5630 // FIXME: in C++0x, we can diagnose if we can prove that the 5631 // nested-name-specifier does not refer to a base class, which is 5632 // still possible in some cases. 5633 5634 // Otherwise we have to conservatively report that things might be 5635 // okay. 5636 return false; 5637 } 5638 5639 if (!NamedContext->isRecord()) { 5640 // Ideally this would point at the last name in the specifier, 5641 // but we don't have that level of source info. 5642 Diag(SS.getRange().getBegin(), 5643 diag::err_using_decl_nested_name_specifier_is_not_class) 5644 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5645 return true; 5646 } 5647 5648 if (!NamedContext->isDependentContext() && 5649 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5650 return true; 5651 5652 if (getLangOptions().CPlusPlus0x) { 5653 // C++0x [namespace.udecl]p3: 5654 // In a using-declaration used as a member-declaration, the 5655 // nested-name-specifier shall name a base class of the class 5656 // being defined. 5657 5658 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5659 cast<CXXRecordDecl>(NamedContext))) { 5660 if (CurContext == NamedContext) { 5661 Diag(NameLoc, 5662 diag::err_using_decl_nested_name_specifier_is_current_class) 5663 << SS.getRange(); 5664 return true; 5665 } 5666 5667 Diag(SS.getRange().getBegin(), 5668 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5669 << (NestedNameSpecifier*) SS.getScopeRep() 5670 << cast<CXXRecordDecl>(CurContext) 5671 << SS.getRange(); 5672 return true; 5673 } 5674 5675 return false; 5676 } 5677 5678 // C++03 [namespace.udecl]p4: 5679 // A using-declaration used as a member-declaration shall refer 5680 // to a member of a base class of the class being defined [etc.]. 5681 5682 // Salient point: SS doesn't have to name a base class as long as 5683 // lookup only finds members from base classes. Therefore we can 5684 // diagnose here only if we can prove that that can't happen, 5685 // i.e. if the class hierarchies provably don't intersect. 5686 5687 // TODO: it would be nice if "definitely valid" results were cached 5688 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5689 // need to be repeated. 5690 5691 struct UserData { 5692 llvm::DenseSet<const CXXRecordDecl*> Bases; 5693 5694 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5695 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5696 Data->Bases.insert(Base); 5697 return true; 5698 } 5699 5700 bool hasDependentBases(const CXXRecordDecl *Class) { 5701 return !Class->forallBases(collect, this); 5702 } 5703 5704 /// Returns true if the base is dependent or is one of the 5705 /// accumulated base classes. 5706 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5707 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5708 return !Data->Bases.count(Base); 5709 } 5710 5711 bool mightShareBases(const CXXRecordDecl *Class) { 5712 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5713 } 5714 }; 5715 5716 UserData Data; 5717 5718 // Returns false if we find a dependent base. 5719 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5720 return false; 5721 5722 // Returns false if the class has a dependent base or if it or one 5723 // of its bases is present in the base set of the current context. 5724 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5725 return false; 5726 5727 Diag(SS.getRange().getBegin(), 5728 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5729 << (NestedNameSpecifier*) SS.getScopeRep() 5730 << cast<CXXRecordDecl>(CurContext) 5731 << SS.getRange(); 5732 5733 return true; 5734} 5735 5736Decl *Sema::ActOnAliasDeclaration(Scope *S, 5737 AccessSpecifier AS, 5738 MultiTemplateParamsArg TemplateParamLists, 5739 SourceLocation UsingLoc, 5740 UnqualifiedId &Name, 5741 TypeResult Type) { 5742 // Skip up to the relevant declaration scope. 5743 while (S->getFlags() & Scope::TemplateParamScope) 5744 S = S->getParent(); 5745 assert((S->getFlags() & Scope::DeclScope) && 5746 "got alias-declaration outside of declaration scope"); 5747 5748 if (Type.isInvalid()) 5749 return 0; 5750 5751 bool Invalid = false; 5752 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5753 TypeSourceInfo *TInfo = 0; 5754 GetTypeFromParser(Type.get(), &TInfo); 5755 5756 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5757 return 0; 5758 5759 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5760 UPPC_DeclarationType)) { 5761 Invalid = true; 5762 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5763 TInfo->getTypeLoc().getBeginLoc()); 5764 } 5765 5766 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5767 LookupName(Previous, S); 5768 5769 // Warn about shadowing the name of a template parameter. 5770 if (Previous.isSingleResult() && 5771 Previous.getFoundDecl()->isTemplateParameter()) { 5772 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5773 Previous.getFoundDecl())) 5774 Invalid = true; 5775 Previous.clear(); 5776 } 5777 5778 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5779 "name in alias declaration must be an identifier"); 5780 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5781 Name.StartLocation, 5782 Name.Identifier, TInfo); 5783 5784 NewTD->setAccess(AS); 5785 5786 if (Invalid) 5787 NewTD->setInvalidDecl(); 5788 5789 CheckTypedefForVariablyModifiedType(S, NewTD); 5790 Invalid |= NewTD->isInvalidDecl(); 5791 5792 bool Redeclaration = false; 5793 5794 NamedDecl *NewND; 5795 if (TemplateParamLists.size()) { 5796 TypeAliasTemplateDecl *OldDecl = 0; 5797 TemplateParameterList *OldTemplateParams = 0; 5798 5799 if (TemplateParamLists.size() != 1) { 5800 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5801 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5802 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5803 } 5804 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5805 5806 // Only consider previous declarations in the same scope. 5807 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5808 /*ExplicitInstantiationOrSpecialization*/false); 5809 if (!Previous.empty()) { 5810 Redeclaration = true; 5811 5812 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5813 if (!OldDecl && !Invalid) { 5814 Diag(UsingLoc, diag::err_redefinition_different_kind) 5815 << Name.Identifier; 5816 5817 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5818 if (OldD->getLocation().isValid()) 5819 Diag(OldD->getLocation(), diag::note_previous_definition); 5820 5821 Invalid = true; 5822 } 5823 5824 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5825 if (TemplateParameterListsAreEqual(TemplateParams, 5826 OldDecl->getTemplateParameters(), 5827 /*Complain=*/true, 5828 TPL_TemplateMatch)) 5829 OldTemplateParams = OldDecl->getTemplateParameters(); 5830 else 5831 Invalid = true; 5832 5833 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5834 if (!Invalid && 5835 !Context.hasSameType(OldTD->getUnderlyingType(), 5836 NewTD->getUnderlyingType())) { 5837 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5838 // but we can't reasonably accept it. 5839 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5840 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5841 if (OldTD->getLocation().isValid()) 5842 Diag(OldTD->getLocation(), diag::note_previous_definition); 5843 Invalid = true; 5844 } 5845 } 5846 } 5847 5848 // Merge any previous default template arguments into our parameters, 5849 // and check the parameter list. 5850 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5851 TPC_TypeAliasTemplate)) 5852 return 0; 5853 5854 TypeAliasTemplateDecl *NewDecl = 5855 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5856 Name.Identifier, TemplateParams, 5857 NewTD); 5858 5859 NewDecl->setAccess(AS); 5860 5861 if (Invalid) 5862 NewDecl->setInvalidDecl(); 5863 else if (OldDecl) 5864 NewDecl->setPreviousDeclaration(OldDecl); 5865 5866 NewND = NewDecl; 5867 } else { 5868 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5869 NewND = NewTD; 5870 } 5871 5872 if (!Redeclaration) 5873 PushOnScopeChains(NewND, S); 5874 5875 return NewND; 5876} 5877 5878Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5879 SourceLocation NamespaceLoc, 5880 SourceLocation AliasLoc, 5881 IdentifierInfo *Alias, 5882 CXXScopeSpec &SS, 5883 SourceLocation IdentLoc, 5884 IdentifierInfo *Ident) { 5885 5886 // Lookup the namespace name. 5887 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5888 LookupParsedName(R, S, &SS); 5889 5890 // Check if we have a previous declaration with the same name. 5891 NamedDecl *PrevDecl 5892 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5893 ForRedeclaration); 5894 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5895 PrevDecl = 0; 5896 5897 if (PrevDecl) { 5898 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5899 // We already have an alias with the same name that points to the same 5900 // namespace, so don't create a new one. 5901 // FIXME: At some point, we'll want to create the (redundant) 5902 // declaration to maintain better source information. 5903 if (!R.isAmbiguous() && !R.empty() && 5904 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5905 return 0; 5906 } 5907 5908 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5909 diag::err_redefinition_different_kind; 5910 Diag(AliasLoc, DiagID) << Alias; 5911 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5912 return 0; 5913 } 5914 5915 if (R.isAmbiguous()) 5916 return 0; 5917 5918 if (R.empty()) { 5919 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5920 CTC_NoKeywords, 0)) { 5921 if (R.getAsSingle<NamespaceDecl>() || 5922 R.getAsSingle<NamespaceAliasDecl>()) { 5923 if (DeclContext *DC = computeDeclContext(SS, false)) 5924 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5925 << Ident << DC << Corrected << SS.getRange() 5926 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5927 else 5928 Diag(IdentLoc, diag::err_using_directive_suggest) 5929 << Ident << Corrected 5930 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5931 5932 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5933 << Corrected; 5934 5935 Ident = Corrected.getAsIdentifierInfo(); 5936 } else { 5937 R.clear(); 5938 R.setLookupName(Ident); 5939 } 5940 } 5941 5942 if (R.empty()) { 5943 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5944 return 0; 5945 } 5946 } 5947 5948 NamespaceAliasDecl *AliasDecl = 5949 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5950 Alias, SS.getWithLocInContext(Context), 5951 IdentLoc, R.getFoundDecl()); 5952 5953 PushOnScopeChains(AliasDecl, S); 5954 return AliasDecl; 5955} 5956 5957namespace { 5958 /// \brief Scoped object used to handle the state changes required in Sema 5959 /// to implicitly define the body of a C++ member function; 5960 class ImplicitlyDefinedFunctionScope { 5961 Sema &S; 5962 Sema::ContextRAII SavedContext; 5963 5964 public: 5965 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5966 : S(S), SavedContext(S, Method) 5967 { 5968 S.PushFunctionScope(); 5969 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5970 } 5971 5972 ~ImplicitlyDefinedFunctionScope() { 5973 S.PopExpressionEvaluationContext(); 5974 S.PopFunctionOrBlockScope(); 5975 } 5976 }; 5977} 5978 5979Sema::ImplicitExceptionSpecification 5980Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5981 // C++ [except.spec]p14: 5982 // An implicitly declared special member function (Clause 12) shall have an 5983 // exception-specification. [...] 5984 ImplicitExceptionSpecification ExceptSpec(Context); 5985 5986 // Direct base-class constructors. 5987 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5988 BEnd = ClassDecl->bases_end(); 5989 B != BEnd; ++B) { 5990 if (B->isVirtual()) // Handled below. 5991 continue; 5992 5993 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5994 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5995 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5996 // If this is a deleted function, add it anyway. This might be conformant 5997 // with the standard. This might not. I'm not sure. It might not matter. 5998 if (Constructor) 5999 ExceptSpec.CalledDecl(Constructor); 6000 } 6001 } 6002 6003 // Virtual base-class constructors. 6004 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6005 BEnd = ClassDecl->vbases_end(); 6006 B != BEnd; ++B) { 6007 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6008 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6009 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6010 // If this is a deleted function, add it anyway. This might be conformant 6011 // with the standard. This might not. I'm not sure. It might not matter. 6012 if (Constructor) 6013 ExceptSpec.CalledDecl(Constructor); 6014 } 6015 } 6016 6017 // Field constructors. 6018 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6019 FEnd = ClassDecl->field_end(); 6020 F != FEnd; ++F) { 6021 if (F->hasInClassInitializer()) { 6022 if (Expr *E = F->getInClassInitializer()) 6023 ExceptSpec.CalledExpr(E); 6024 else if (!F->isInvalidDecl()) 6025 ExceptSpec.SetDelayed(); 6026 } else if (const RecordType *RecordTy 6027 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6028 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6029 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6030 // If this is a deleted function, add it anyway. This might be conformant 6031 // with the standard. This might not. I'm not sure. It might not matter. 6032 // In particular, the problem is that this function never gets called. It 6033 // might just be ill-formed because this function attempts to refer to 6034 // a deleted function here. 6035 if (Constructor) 6036 ExceptSpec.CalledDecl(Constructor); 6037 } 6038 } 6039 6040 return ExceptSpec; 6041} 6042 6043CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6044 CXXRecordDecl *ClassDecl) { 6045 // C++ [class.ctor]p5: 6046 // A default constructor for a class X is a constructor of class X 6047 // that can be called without an argument. If there is no 6048 // user-declared constructor for class X, a default constructor is 6049 // implicitly declared. An implicitly-declared default constructor 6050 // is an inline public member of its class. 6051 assert(!ClassDecl->hasUserDeclaredConstructor() && 6052 "Should not build implicit default constructor!"); 6053 6054 ImplicitExceptionSpecification Spec = 6055 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6056 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6057 6058 // Create the actual constructor declaration. 6059 CanQualType ClassType 6060 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6061 SourceLocation ClassLoc = ClassDecl->getLocation(); 6062 DeclarationName Name 6063 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6064 DeclarationNameInfo NameInfo(Name, ClassLoc); 6065 CXXConstructorDecl *DefaultCon 6066 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6067 Context.getFunctionType(Context.VoidTy, 6068 0, 0, EPI), 6069 /*TInfo=*/0, 6070 /*isExplicit=*/false, 6071 /*isInline=*/true, 6072 /*isImplicitlyDeclared=*/true); 6073 DefaultCon->setAccess(AS_public); 6074 DefaultCon->setDefaulted(); 6075 DefaultCon->setImplicit(); 6076 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6077 6078 // Note that we have declared this constructor. 6079 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6080 6081 if (Scope *S = getScopeForContext(ClassDecl)) 6082 PushOnScopeChains(DefaultCon, S, false); 6083 ClassDecl->addDecl(DefaultCon); 6084 6085 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6086 DefaultCon->setDeletedAsWritten(); 6087 6088 return DefaultCon; 6089} 6090 6091void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6092 CXXConstructorDecl *Constructor) { 6093 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6094 !Constructor->doesThisDeclarationHaveABody() && 6095 !Constructor->isDeleted()) && 6096 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6097 6098 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6099 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6100 6101 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6102 DiagnosticErrorTrap Trap(Diags); 6103 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6104 Trap.hasErrorOccurred()) { 6105 Diag(CurrentLocation, diag::note_member_synthesized_at) 6106 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6107 Constructor->setInvalidDecl(); 6108 return; 6109 } 6110 6111 SourceLocation Loc = Constructor->getLocation(); 6112 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6113 6114 Constructor->setUsed(); 6115 MarkVTableUsed(CurrentLocation, ClassDecl); 6116 6117 if (ASTMutationListener *L = getASTMutationListener()) { 6118 L->CompletedImplicitDefinition(Constructor); 6119 } 6120} 6121 6122/// Get any existing defaulted default constructor for the given class. Do not 6123/// implicitly define one if it does not exist. 6124static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6125 CXXRecordDecl *D) { 6126 ASTContext &Context = Self.Context; 6127 QualType ClassType = Context.getTypeDeclType(D); 6128 DeclarationName ConstructorName 6129 = Context.DeclarationNames.getCXXConstructorName( 6130 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6131 6132 DeclContext::lookup_const_iterator Con, ConEnd; 6133 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6134 Con != ConEnd; ++Con) { 6135 // A function template cannot be defaulted. 6136 if (isa<FunctionTemplateDecl>(*Con)) 6137 continue; 6138 6139 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6140 if (Constructor->isDefaultConstructor()) 6141 return Constructor->isDefaulted() ? Constructor : 0; 6142 } 6143 return 0; 6144} 6145 6146void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6147 if (!D) return; 6148 AdjustDeclIfTemplate(D); 6149 6150 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6151 CXXConstructorDecl *CtorDecl 6152 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6153 6154 if (!CtorDecl) return; 6155 6156 // Compute the exception specification for the default constructor. 6157 const FunctionProtoType *CtorTy = 6158 CtorDecl->getType()->castAs<FunctionProtoType>(); 6159 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6160 ImplicitExceptionSpecification Spec = 6161 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6162 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6163 assert(EPI.ExceptionSpecType != EST_Delayed); 6164 6165 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6166 } 6167 6168 // If the default constructor is explicitly defaulted, checking the exception 6169 // specification is deferred until now. 6170 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6171 !ClassDecl->isDependentType()) 6172 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6173} 6174 6175void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6176 // We start with an initial pass over the base classes to collect those that 6177 // inherit constructors from. If there are none, we can forgo all further 6178 // processing. 6179 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6180 BasesVector BasesToInheritFrom; 6181 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6182 BaseE = ClassDecl->bases_end(); 6183 BaseIt != BaseE; ++BaseIt) { 6184 if (BaseIt->getInheritConstructors()) { 6185 QualType Base = BaseIt->getType(); 6186 if (Base->isDependentType()) { 6187 // If we inherit constructors from anything that is dependent, just 6188 // abort processing altogether. We'll get another chance for the 6189 // instantiations. 6190 return; 6191 } 6192 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6193 } 6194 } 6195 if (BasesToInheritFrom.empty()) 6196 return; 6197 6198 // Now collect the constructors that we already have in the current class. 6199 // Those take precedence over inherited constructors. 6200 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6201 // unless there is a user-declared constructor with the same signature in 6202 // the class where the using-declaration appears. 6203 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6204 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6205 CtorE = ClassDecl->ctor_end(); 6206 CtorIt != CtorE; ++CtorIt) { 6207 ExistingConstructors.insert( 6208 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6209 } 6210 6211 Scope *S = getScopeForContext(ClassDecl); 6212 DeclarationName CreatedCtorName = 6213 Context.DeclarationNames.getCXXConstructorName( 6214 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6215 6216 // Now comes the true work. 6217 // First, we keep a map from constructor types to the base that introduced 6218 // them. Needed for finding conflicting constructors. We also keep the 6219 // actually inserted declarations in there, for pretty diagnostics. 6220 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6221 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6222 ConstructorToSourceMap InheritedConstructors; 6223 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6224 BaseE = BasesToInheritFrom.end(); 6225 BaseIt != BaseE; ++BaseIt) { 6226 const RecordType *Base = *BaseIt; 6227 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6228 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6229 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6230 CtorE = BaseDecl->ctor_end(); 6231 CtorIt != CtorE; ++CtorIt) { 6232 // Find the using declaration for inheriting this base's constructors. 6233 DeclarationName Name = 6234 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6235 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6236 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6237 SourceLocation UsingLoc = UD ? UD->getLocation() : 6238 ClassDecl->getLocation(); 6239 6240 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6241 // from the class X named in the using-declaration consists of actual 6242 // constructors and notional constructors that result from the 6243 // transformation of defaulted parameters as follows: 6244 // - all non-template default constructors of X, and 6245 // - for each non-template constructor of X that has at least one 6246 // parameter with a default argument, the set of constructors that 6247 // results from omitting any ellipsis parameter specification and 6248 // successively omitting parameters with a default argument from the 6249 // end of the parameter-type-list. 6250 CXXConstructorDecl *BaseCtor = *CtorIt; 6251 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6252 const FunctionProtoType *BaseCtorType = 6253 BaseCtor->getType()->getAs<FunctionProtoType>(); 6254 6255 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6256 maxParams = BaseCtor->getNumParams(); 6257 params <= maxParams; ++params) { 6258 // Skip default constructors. They're never inherited. 6259 if (params == 0) 6260 continue; 6261 // Skip copy and move constructors for the same reason. 6262 if (CanBeCopyOrMove && params == 1) 6263 continue; 6264 6265 // Build up a function type for this particular constructor. 6266 // FIXME: The working paper does not consider that the exception spec 6267 // for the inheriting constructor might be larger than that of the 6268 // source. This code doesn't yet, either. When it does, this code will 6269 // need to be delayed until after exception specifications and in-class 6270 // member initializers are attached. 6271 const Type *NewCtorType; 6272 if (params == maxParams) 6273 NewCtorType = BaseCtorType; 6274 else { 6275 llvm::SmallVector<QualType, 16> Args; 6276 for (unsigned i = 0; i < params; ++i) { 6277 Args.push_back(BaseCtorType->getArgType(i)); 6278 } 6279 FunctionProtoType::ExtProtoInfo ExtInfo = 6280 BaseCtorType->getExtProtoInfo(); 6281 ExtInfo.Variadic = false; 6282 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6283 Args.data(), params, ExtInfo) 6284 .getTypePtr(); 6285 } 6286 const Type *CanonicalNewCtorType = 6287 Context.getCanonicalType(NewCtorType); 6288 6289 // Now that we have the type, first check if the class already has a 6290 // constructor with this signature. 6291 if (ExistingConstructors.count(CanonicalNewCtorType)) 6292 continue; 6293 6294 // Then we check if we have already declared an inherited constructor 6295 // with this signature. 6296 std::pair<ConstructorToSourceMap::iterator, bool> result = 6297 InheritedConstructors.insert(std::make_pair( 6298 CanonicalNewCtorType, 6299 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6300 if (!result.second) { 6301 // Already in the map. If it came from a different class, that's an 6302 // error. Not if it's from the same. 6303 CanQualType PreviousBase = result.first->second.first; 6304 if (CanonicalBase != PreviousBase) { 6305 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6306 const CXXConstructorDecl *PrevBaseCtor = 6307 PrevCtor->getInheritedConstructor(); 6308 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6309 6310 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6311 Diag(BaseCtor->getLocation(), 6312 diag::note_using_decl_constructor_conflict_current_ctor); 6313 Diag(PrevBaseCtor->getLocation(), 6314 diag::note_using_decl_constructor_conflict_previous_ctor); 6315 Diag(PrevCtor->getLocation(), 6316 diag::note_using_decl_constructor_conflict_previous_using); 6317 } 6318 continue; 6319 } 6320 6321 // OK, we're there, now add the constructor. 6322 // C++0x [class.inhctor]p8: [...] that would be performed by a 6323 // user-writtern inline constructor [...] 6324 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6325 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6326 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6327 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6328 /*ImplicitlyDeclared=*/true); 6329 NewCtor->setAccess(BaseCtor->getAccess()); 6330 6331 // Build up the parameter decls and add them. 6332 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6333 for (unsigned i = 0; i < params; ++i) { 6334 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6335 UsingLoc, UsingLoc, 6336 /*IdentifierInfo=*/0, 6337 BaseCtorType->getArgType(i), 6338 /*TInfo=*/0, SC_None, 6339 SC_None, /*DefaultArg=*/0)); 6340 } 6341 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6342 NewCtor->setInheritedConstructor(BaseCtor); 6343 6344 PushOnScopeChains(NewCtor, S, false); 6345 ClassDecl->addDecl(NewCtor); 6346 result.first->second.second = NewCtor; 6347 } 6348 } 6349 } 6350} 6351 6352Sema::ImplicitExceptionSpecification 6353Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6354 // C++ [except.spec]p14: 6355 // An implicitly declared special member function (Clause 12) shall have 6356 // an exception-specification. 6357 ImplicitExceptionSpecification ExceptSpec(Context); 6358 6359 // Direct base-class destructors. 6360 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6361 BEnd = ClassDecl->bases_end(); 6362 B != BEnd; ++B) { 6363 if (B->isVirtual()) // Handled below. 6364 continue; 6365 6366 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6367 ExceptSpec.CalledDecl( 6368 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6369 } 6370 6371 // Virtual base-class destructors. 6372 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6373 BEnd = ClassDecl->vbases_end(); 6374 B != BEnd; ++B) { 6375 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6376 ExceptSpec.CalledDecl( 6377 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6378 } 6379 6380 // Field destructors. 6381 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6382 FEnd = ClassDecl->field_end(); 6383 F != FEnd; ++F) { 6384 if (const RecordType *RecordTy 6385 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6386 ExceptSpec.CalledDecl( 6387 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6388 } 6389 6390 return ExceptSpec; 6391} 6392 6393CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6394 // C++ [class.dtor]p2: 6395 // If a class has no user-declared destructor, a destructor is 6396 // declared implicitly. An implicitly-declared destructor is an 6397 // inline public member of its class. 6398 6399 ImplicitExceptionSpecification Spec = 6400 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6401 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6402 6403 // Create the actual destructor declaration. 6404 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6405 6406 CanQualType ClassType 6407 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6408 SourceLocation ClassLoc = ClassDecl->getLocation(); 6409 DeclarationName Name 6410 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6411 DeclarationNameInfo NameInfo(Name, ClassLoc); 6412 CXXDestructorDecl *Destructor 6413 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6414 /*isInline=*/true, 6415 /*isImplicitlyDeclared=*/true); 6416 Destructor->setAccess(AS_public); 6417 Destructor->setDefaulted(); 6418 Destructor->setImplicit(); 6419 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6420 6421 // Note that we have declared this destructor. 6422 ++ASTContext::NumImplicitDestructorsDeclared; 6423 6424 // Introduce this destructor into its scope. 6425 if (Scope *S = getScopeForContext(ClassDecl)) 6426 PushOnScopeChains(Destructor, S, false); 6427 ClassDecl->addDecl(Destructor); 6428 6429 // This could be uniqued if it ever proves significant. 6430 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6431 6432 if (ShouldDeleteDestructor(Destructor)) 6433 Destructor->setDeletedAsWritten(); 6434 6435 AddOverriddenMethods(ClassDecl, Destructor); 6436 6437 return Destructor; 6438} 6439 6440void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6441 CXXDestructorDecl *Destructor) { 6442 assert((Destructor->isDefaulted() && 6443 !Destructor->doesThisDeclarationHaveABody()) && 6444 "DefineImplicitDestructor - call it for implicit default dtor"); 6445 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6446 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6447 6448 if (Destructor->isInvalidDecl()) 6449 return; 6450 6451 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6452 6453 DiagnosticErrorTrap Trap(Diags); 6454 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6455 Destructor->getParent()); 6456 6457 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6458 Diag(CurrentLocation, diag::note_member_synthesized_at) 6459 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6460 6461 Destructor->setInvalidDecl(); 6462 return; 6463 } 6464 6465 SourceLocation Loc = Destructor->getLocation(); 6466 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6467 6468 Destructor->setUsed(); 6469 MarkVTableUsed(CurrentLocation, ClassDecl); 6470 6471 if (ASTMutationListener *L = getASTMutationListener()) { 6472 L->CompletedImplicitDefinition(Destructor); 6473 } 6474} 6475 6476void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6477 CXXDestructorDecl *destructor) { 6478 // C++11 [class.dtor]p3: 6479 // A declaration of a destructor that does not have an exception- 6480 // specification is implicitly considered to have the same exception- 6481 // specification as an implicit declaration. 6482 const FunctionProtoType *dtorType = destructor->getType()-> 6483 getAs<FunctionProtoType>(); 6484 if (dtorType->hasExceptionSpec()) 6485 return; 6486 6487 ImplicitExceptionSpecification exceptSpec = 6488 ComputeDefaultedDtorExceptionSpec(classDecl); 6489 6490 // Replace the destructor's type. 6491 FunctionProtoType::ExtProtoInfo epi; 6492 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6493 epi.NumExceptions = exceptSpec.size(); 6494 epi.Exceptions = exceptSpec.data(); 6495 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6496 6497 destructor->setType(ty); 6498 6499 // FIXME: If the destructor has a body that could throw, and the newly created 6500 // spec doesn't allow exceptions, we should emit a warning, because this 6501 // change in behavior can break conforming C++03 programs at runtime. 6502 // However, we don't have a body yet, so it needs to be done somewhere else. 6503} 6504 6505/// \brief Builds a statement that copies the given entity from \p From to 6506/// \c To. 6507/// 6508/// This routine is used to copy the members of a class with an 6509/// implicitly-declared copy assignment operator. When the entities being 6510/// copied are arrays, this routine builds for loops to copy them. 6511/// 6512/// \param S The Sema object used for type-checking. 6513/// 6514/// \param Loc The location where the implicit copy is being generated. 6515/// 6516/// \param T The type of the expressions being copied. Both expressions must 6517/// have this type. 6518/// 6519/// \param To The expression we are copying to. 6520/// 6521/// \param From The expression we are copying from. 6522/// 6523/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6524/// Otherwise, it's a non-static member subobject. 6525/// 6526/// \param Depth Internal parameter recording the depth of the recursion. 6527/// 6528/// \returns A statement or a loop that copies the expressions. 6529static StmtResult 6530BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6531 Expr *To, Expr *From, 6532 bool CopyingBaseSubobject, unsigned Depth = 0) { 6533 // C++0x [class.copy]p30: 6534 // Each subobject is assigned in the manner appropriate to its type: 6535 // 6536 // - if the subobject is of class type, the copy assignment operator 6537 // for the class is used (as if by explicit qualification; that is, 6538 // ignoring any possible virtual overriding functions in more derived 6539 // classes); 6540 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6541 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6542 6543 // Look for operator=. 6544 DeclarationName Name 6545 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6546 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6547 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6548 6549 // Filter out any result that isn't a copy-assignment operator. 6550 LookupResult::Filter F = OpLookup.makeFilter(); 6551 while (F.hasNext()) { 6552 NamedDecl *D = F.next(); 6553 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6554 if (Method->isCopyAssignmentOperator()) 6555 continue; 6556 6557 F.erase(); 6558 } 6559 F.done(); 6560 6561 // Suppress the protected check (C++ [class.protected]) for each of the 6562 // assignment operators we found. This strange dance is required when 6563 // we're assigning via a base classes's copy-assignment operator. To 6564 // ensure that we're getting the right base class subobject (without 6565 // ambiguities), we need to cast "this" to that subobject type; to 6566 // ensure that we don't go through the virtual call mechanism, we need 6567 // to qualify the operator= name with the base class (see below). However, 6568 // this means that if the base class has a protected copy assignment 6569 // operator, the protected member access check will fail. So, we 6570 // rewrite "protected" access to "public" access in this case, since we 6571 // know by construction that we're calling from a derived class. 6572 if (CopyingBaseSubobject) { 6573 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6574 L != LEnd; ++L) { 6575 if (L.getAccess() == AS_protected) 6576 L.setAccess(AS_public); 6577 } 6578 } 6579 6580 // Create the nested-name-specifier that will be used to qualify the 6581 // reference to operator=; this is required to suppress the virtual 6582 // call mechanism. 6583 CXXScopeSpec SS; 6584 SS.MakeTrivial(S.Context, 6585 NestedNameSpecifier::Create(S.Context, 0, false, 6586 T.getTypePtr()), 6587 Loc); 6588 6589 // Create the reference to operator=. 6590 ExprResult OpEqualRef 6591 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6592 /*FirstQualifierInScope=*/0, OpLookup, 6593 /*TemplateArgs=*/0, 6594 /*SuppressQualifierCheck=*/true); 6595 if (OpEqualRef.isInvalid()) 6596 return StmtError(); 6597 6598 // Build the call to the assignment operator. 6599 6600 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6601 OpEqualRef.takeAs<Expr>(), 6602 Loc, &From, 1, Loc); 6603 if (Call.isInvalid()) 6604 return StmtError(); 6605 6606 return S.Owned(Call.takeAs<Stmt>()); 6607 } 6608 6609 // - if the subobject is of scalar type, the built-in assignment 6610 // operator is used. 6611 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6612 if (!ArrayTy) { 6613 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6614 if (Assignment.isInvalid()) 6615 return StmtError(); 6616 6617 return S.Owned(Assignment.takeAs<Stmt>()); 6618 } 6619 6620 // - if the subobject is an array, each element is assigned, in the 6621 // manner appropriate to the element type; 6622 6623 // Construct a loop over the array bounds, e.g., 6624 // 6625 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6626 // 6627 // that will copy each of the array elements. 6628 QualType SizeType = S.Context.getSizeType(); 6629 6630 // Create the iteration variable. 6631 IdentifierInfo *IterationVarName = 0; 6632 { 6633 llvm::SmallString<8> Str; 6634 llvm::raw_svector_ostream OS(Str); 6635 OS << "__i" << Depth; 6636 IterationVarName = &S.Context.Idents.get(OS.str()); 6637 } 6638 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6639 IterationVarName, SizeType, 6640 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6641 SC_None, SC_None); 6642 6643 // Initialize the iteration variable to zero. 6644 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6645 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6646 6647 // Create a reference to the iteration variable; we'll use this several 6648 // times throughout. 6649 Expr *IterationVarRef 6650 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6651 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6652 6653 // Create the DeclStmt that holds the iteration variable. 6654 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6655 6656 // Create the comparison against the array bound. 6657 llvm::APInt Upper 6658 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6659 Expr *Comparison 6660 = new (S.Context) BinaryOperator(IterationVarRef, 6661 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6662 BO_NE, S.Context.BoolTy, 6663 VK_RValue, OK_Ordinary, Loc); 6664 6665 // Create the pre-increment of the iteration variable. 6666 Expr *Increment 6667 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6668 VK_LValue, OK_Ordinary, Loc); 6669 6670 // Subscript the "from" and "to" expressions with the iteration variable. 6671 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6672 IterationVarRef, Loc)); 6673 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6674 IterationVarRef, Loc)); 6675 6676 // Build the copy for an individual element of the array. 6677 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6678 To, From, CopyingBaseSubobject, 6679 Depth + 1); 6680 if (Copy.isInvalid()) 6681 return StmtError(); 6682 6683 // Construct the loop that copies all elements of this array. 6684 return S.ActOnForStmt(Loc, Loc, InitStmt, 6685 S.MakeFullExpr(Comparison), 6686 0, S.MakeFullExpr(Increment), 6687 Loc, Copy.take()); 6688} 6689 6690/// \brief Determine whether the given class has a copy assignment operator 6691/// that accepts a const-qualified argument. 6692static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6693 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6694 6695 if (!Class->hasDeclaredCopyAssignment()) 6696 S.DeclareImplicitCopyAssignment(Class); 6697 6698 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6699 DeclarationName OpName 6700 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6701 6702 DeclContext::lookup_const_iterator Op, OpEnd; 6703 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6704 // C++ [class.copy]p9: 6705 // A user-declared copy assignment operator is a non-static non-template 6706 // member function of class X with exactly one parameter of type X, X&, 6707 // const X&, volatile X& or const volatile X&. 6708 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6709 if (!Method) 6710 continue; 6711 6712 if (Method->isStatic()) 6713 continue; 6714 if (Method->getPrimaryTemplate()) 6715 continue; 6716 const FunctionProtoType *FnType = 6717 Method->getType()->getAs<FunctionProtoType>(); 6718 assert(FnType && "Overloaded operator has no prototype."); 6719 // Don't assert on this; an invalid decl might have been left in the AST. 6720 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6721 continue; 6722 bool AcceptsConst = true; 6723 QualType ArgType = FnType->getArgType(0); 6724 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6725 ArgType = Ref->getPointeeType(); 6726 // Is it a non-const lvalue reference? 6727 if (!ArgType.isConstQualified()) 6728 AcceptsConst = false; 6729 } 6730 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6731 continue; 6732 6733 // We have a single argument of type cv X or cv X&, i.e. we've found the 6734 // copy assignment operator. Return whether it accepts const arguments. 6735 return AcceptsConst; 6736 } 6737 assert(Class->isInvalidDecl() && 6738 "No copy assignment operator declared in valid code."); 6739 return false; 6740} 6741 6742std::pair<Sema::ImplicitExceptionSpecification, bool> 6743Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6744 CXXRecordDecl *ClassDecl) { 6745 // C++ [class.copy]p10: 6746 // If the class definition does not explicitly declare a copy 6747 // assignment operator, one is declared implicitly. 6748 // The implicitly-defined copy assignment operator for a class X 6749 // will have the form 6750 // 6751 // X& X::operator=(const X&) 6752 // 6753 // if 6754 bool HasConstCopyAssignment = true; 6755 6756 // -- each direct base class B of X has a copy assignment operator 6757 // whose parameter is of type const B&, const volatile B& or B, 6758 // and 6759 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6760 BaseEnd = ClassDecl->bases_end(); 6761 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6762 assert(!Base->getType()->isDependentType() && 6763 "Cannot generate implicit members for class with dependent bases."); 6764 const CXXRecordDecl *BaseClassDecl 6765 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6766 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6767 } 6768 6769 // -- for all the nonstatic data members of X that are of a class 6770 // type M (or array thereof), each such class type has a copy 6771 // assignment operator whose parameter is of type const M&, 6772 // const volatile M& or M. 6773 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6774 FieldEnd = ClassDecl->field_end(); 6775 HasConstCopyAssignment && Field != FieldEnd; 6776 ++Field) { 6777 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6778 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6779 const CXXRecordDecl *FieldClassDecl 6780 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6781 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6782 } 6783 } 6784 6785 // Otherwise, the implicitly declared copy assignment operator will 6786 // have the form 6787 // 6788 // X& X::operator=(X&) 6789 6790 // C++ [except.spec]p14: 6791 // An implicitly declared special member function (Clause 12) shall have an 6792 // exception-specification. [...] 6793 ImplicitExceptionSpecification ExceptSpec(Context); 6794 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6795 BaseEnd = ClassDecl->bases_end(); 6796 Base != BaseEnd; ++Base) { 6797 CXXRecordDecl *BaseClassDecl 6798 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6799 6800 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6801 DeclareImplicitCopyAssignment(BaseClassDecl); 6802 6803 if (CXXMethodDecl *CopyAssign 6804 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6805 ExceptSpec.CalledDecl(CopyAssign); 6806 } 6807 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6808 FieldEnd = ClassDecl->field_end(); 6809 Field != FieldEnd; 6810 ++Field) { 6811 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6812 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6813 CXXRecordDecl *FieldClassDecl 6814 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6815 6816 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6817 DeclareImplicitCopyAssignment(FieldClassDecl); 6818 6819 if (CXXMethodDecl *CopyAssign 6820 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6821 ExceptSpec.CalledDecl(CopyAssign); 6822 } 6823 } 6824 6825 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6826} 6827 6828CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6829 // Note: The following rules are largely analoguous to the copy 6830 // constructor rules. Note that virtual bases are not taken into account 6831 // for determining the argument type of the operator. Note also that 6832 // operators taking an object instead of a reference are allowed. 6833 6834 ImplicitExceptionSpecification Spec(Context); 6835 bool Const; 6836 llvm::tie(Spec, Const) = 6837 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6838 6839 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6840 QualType RetType = Context.getLValueReferenceType(ArgType); 6841 if (Const) 6842 ArgType = ArgType.withConst(); 6843 ArgType = Context.getLValueReferenceType(ArgType); 6844 6845 // An implicitly-declared copy assignment operator is an inline public 6846 // member of its class. 6847 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6848 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6849 SourceLocation ClassLoc = ClassDecl->getLocation(); 6850 DeclarationNameInfo NameInfo(Name, ClassLoc); 6851 CXXMethodDecl *CopyAssignment 6852 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6853 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6854 /*TInfo=*/0, /*isStatic=*/false, 6855 /*StorageClassAsWritten=*/SC_None, 6856 /*isInline=*/true, 6857 SourceLocation()); 6858 CopyAssignment->setAccess(AS_public); 6859 CopyAssignment->setDefaulted(); 6860 CopyAssignment->setImplicit(); 6861 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6862 6863 // Add the parameter to the operator. 6864 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6865 ClassLoc, ClassLoc, /*Id=*/0, 6866 ArgType, /*TInfo=*/0, 6867 SC_None, 6868 SC_None, 0); 6869 CopyAssignment->setParams(&FromParam, 1); 6870 6871 // Note that we have added this copy-assignment operator. 6872 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6873 6874 if (Scope *S = getScopeForContext(ClassDecl)) 6875 PushOnScopeChains(CopyAssignment, S, false); 6876 ClassDecl->addDecl(CopyAssignment); 6877 6878 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6879 CopyAssignment->setDeletedAsWritten(); 6880 6881 AddOverriddenMethods(ClassDecl, CopyAssignment); 6882 return CopyAssignment; 6883} 6884 6885void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6886 CXXMethodDecl *CopyAssignOperator) { 6887 assert((CopyAssignOperator->isDefaulted() && 6888 CopyAssignOperator->isOverloadedOperator() && 6889 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6890 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6891 "DefineImplicitCopyAssignment called for wrong function"); 6892 6893 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6894 6895 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6896 CopyAssignOperator->setInvalidDecl(); 6897 return; 6898 } 6899 6900 CopyAssignOperator->setUsed(); 6901 6902 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6903 DiagnosticErrorTrap Trap(Diags); 6904 6905 // C++0x [class.copy]p30: 6906 // The implicitly-defined or explicitly-defaulted copy assignment operator 6907 // for a non-union class X performs memberwise copy assignment of its 6908 // subobjects. The direct base classes of X are assigned first, in the 6909 // order of their declaration in the base-specifier-list, and then the 6910 // immediate non-static data members of X are assigned, in the order in 6911 // which they were declared in the class definition. 6912 6913 // The statements that form the synthesized function body. 6914 ASTOwningVector<Stmt*> Statements(*this); 6915 6916 // The parameter for the "other" object, which we are copying from. 6917 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6918 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6919 QualType OtherRefType = Other->getType(); 6920 if (const LValueReferenceType *OtherRef 6921 = OtherRefType->getAs<LValueReferenceType>()) { 6922 OtherRefType = OtherRef->getPointeeType(); 6923 OtherQuals = OtherRefType.getQualifiers(); 6924 } 6925 6926 // Our location for everything implicitly-generated. 6927 SourceLocation Loc = CopyAssignOperator->getLocation(); 6928 6929 // Construct a reference to the "other" object. We'll be using this 6930 // throughout the generated ASTs. 6931 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6932 assert(OtherRef && "Reference to parameter cannot fail!"); 6933 6934 // Construct the "this" pointer. We'll be using this throughout the generated 6935 // ASTs. 6936 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6937 assert(This && "Reference to this cannot fail!"); 6938 6939 // Assign base classes. 6940 bool Invalid = false; 6941 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6942 E = ClassDecl->bases_end(); Base != E; ++Base) { 6943 // Form the assignment: 6944 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6945 QualType BaseType = Base->getType().getUnqualifiedType(); 6946 if (!BaseType->isRecordType()) { 6947 Invalid = true; 6948 continue; 6949 } 6950 6951 CXXCastPath BasePath; 6952 BasePath.push_back(Base); 6953 6954 // Construct the "from" expression, which is an implicit cast to the 6955 // appropriately-qualified base type. 6956 Expr *From = OtherRef; 6957 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6958 CK_UncheckedDerivedToBase, 6959 VK_LValue, &BasePath).take(); 6960 6961 // Dereference "this". 6962 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6963 6964 // Implicitly cast "this" to the appropriately-qualified base type. 6965 To = ImpCastExprToType(To.take(), 6966 Context.getCVRQualifiedType(BaseType, 6967 CopyAssignOperator->getTypeQualifiers()), 6968 CK_UncheckedDerivedToBase, 6969 VK_LValue, &BasePath); 6970 6971 // Build the copy. 6972 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6973 To.get(), From, 6974 /*CopyingBaseSubobject=*/true); 6975 if (Copy.isInvalid()) { 6976 Diag(CurrentLocation, diag::note_member_synthesized_at) 6977 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6978 CopyAssignOperator->setInvalidDecl(); 6979 return; 6980 } 6981 6982 // Success! Record the copy. 6983 Statements.push_back(Copy.takeAs<Expr>()); 6984 } 6985 6986 // \brief Reference to the __builtin_memcpy function. 6987 Expr *BuiltinMemCpyRef = 0; 6988 // \brief Reference to the __builtin_objc_memmove_collectable function. 6989 Expr *CollectableMemCpyRef = 0; 6990 6991 // Assign non-static members. 6992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6993 FieldEnd = ClassDecl->field_end(); 6994 Field != FieldEnd; ++Field) { 6995 // Check for members of reference type; we can't copy those. 6996 if (Field->getType()->isReferenceType()) { 6997 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6998 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6999 Diag(Field->getLocation(), diag::note_declared_at); 7000 Diag(CurrentLocation, diag::note_member_synthesized_at) 7001 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7002 Invalid = true; 7003 continue; 7004 } 7005 7006 // Check for members of const-qualified, non-class type. 7007 QualType BaseType = Context.getBaseElementType(Field->getType()); 7008 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7009 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7010 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7011 Diag(Field->getLocation(), diag::note_declared_at); 7012 Diag(CurrentLocation, diag::note_member_synthesized_at) 7013 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7014 Invalid = true; 7015 continue; 7016 } 7017 7018 QualType FieldType = Field->getType().getNonReferenceType(); 7019 if (FieldType->isIncompleteArrayType()) { 7020 assert(ClassDecl->hasFlexibleArrayMember() && 7021 "Incomplete array type is not valid"); 7022 continue; 7023 } 7024 7025 // Build references to the field in the object we're copying from and to. 7026 CXXScopeSpec SS; // Intentionally empty 7027 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7028 LookupMemberName); 7029 MemberLookup.addDecl(*Field); 7030 MemberLookup.resolveKind(); 7031 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7032 Loc, /*IsArrow=*/false, 7033 SS, 0, MemberLookup, 0); 7034 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7035 Loc, /*IsArrow=*/true, 7036 SS, 0, MemberLookup, 0); 7037 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7038 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7039 7040 // If the field should be copied with __builtin_memcpy rather than via 7041 // explicit assignments, do so. This optimization only applies for arrays 7042 // of scalars and arrays of class type with trivial copy-assignment 7043 // operators. 7044 if (FieldType->isArrayType() && 7045 (!BaseType->isRecordType() || 7046 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 7047 ->hasTrivialCopyAssignment())) { 7048 // Compute the size of the memory buffer to be copied. 7049 QualType SizeType = Context.getSizeType(); 7050 llvm::APInt Size(Context.getTypeSize(SizeType), 7051 Context.getTypeSizeInChars(BaseType).getQuantity()); 7052 for (const ConstantArrayType *Array 7053 = Context.getAsConstantArrayType(FieldType); 7054 Array; 7055 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7056 llvm::APInt ArraySize 7057 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7058 Size *= ArraySize; 7059 } 7060 7061 // Take the address of the field references for "from" and "to". 7062 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7063 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7064 7065 bool NeedsCollectableMemCpy = 7066 (BaseType->isRecordType() && 7067 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7068 7069 if (NeedsCollectableMemCpy) { 7070 if (!CollectableMemCpyRef) { 7071 // Create a reference to the __builtin_objc_memmove_collectable function. 7072 LookupResult R(*this, 7073 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7074 Loc, LookupOrdinaryName); 7075 LookupName(R, TUScope, true); 7076 7077 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7078 if (!CollectableMemCpy) { 7079 // Something went horribly wrong earlier, and we will have 7080 // complained about it. 7081 Invalid = true; 7082 continue; 7083 } 7084 7085 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7086 CollectableMemCpy->getType(), 7087 VK_LValue, Loc, 0).take(); 7088 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7089 } 7090 } 7091 // Create a reference to the __builtin_memcpy builtin function. 7092 else if (!BuiltinMemCpyRef) { 7093 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7094 LookupOrdinaryName); 7095 LookupName(R, TUScope, true); 7096 7097 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7098 if (!BuiltinMemCpy) { 7099 // Something went horribly wrong earlier, and we will have complained 7100 // about it. 7101 Invalid = true; 7102 continue; 7103 } 7104 7105 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7106 BuiltinMemCpy->getType(), 7107 VK_LValue, Loc, 0).take(); 7108 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7109 } 7110 7111 ASTOwningVector<Expr*> CallArgs(*this); 7112 CallArgs.push_back(To.takeAs<Expr>()); 7113 CallArgs.push_back(From.takeAs<Expr>()); 7114 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7115 ExprResult Call = ExprError(); 7116 if (NeedsCollectableMemCpy) 7117 Call = ActOnCallExpr(/*Scope=*/0, 7118 CollectableMemCpyRef, 7119 Loc, move_arg(CallArgs), 7120 Loc); 7121 else 7122 Call = ActOnCallExpr(/*Scope=*/0, 7123 BuiltinMemCpyRef, 7124 Loc, move_arg(CallArgs), 7125 Loc); 7126 7127 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7128 Statements.push_back(Call.takeAs<Expr>()); 7129 continue; 7130 } 7131 7132 // Build the copy of this field. 7133 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7134 To.get(), From.get(), 7135 /*CopyingBaseSubobject=*/false); 7136 if (Copy.isInvalid()) { 7137 Diag(CurrentLocation, diag::note_member_synthesized_at) 7138 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7139 CopyAssignOperator->setInvalidDecl(); 7140 return; 7141 } 7142 7143 // Success! Record the copy. 7144 Statements.push_back(Copy.takeAs<Stmt>()); 7145 } 7146 7147 if (!Invalid) { 7148 // Add a "return *this;" 7149 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7150 7151 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7152 if (Return.isInvalid()) 7153 Invalid = true; 7154 else { 7155 Statements.push_back(Return.takeAs<Stmt>()); 7156 7157 if (Trap.hasErrorOccurred()) { 7158 Diag(CurrentLocation, diag::note_member_synthesized_at) 7159 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7160 Invalid = true; 7161 } 7162 } 7163 } 7164 7165 if (Invalid) { 7166 CopyAssignOperator->setInvalidDecl(); 7167 return; 7168 } 7169 7170 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7171 /*isStmtExpr=*/false); 7172 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7173 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7174 7175 if (ASTMutationListener *L = getASTMutationListener()) { 7176 L->CompletedImplicitDefinition(CopyAssignOperator); 7177 } 7178} 7179 7180std::pair<Sema::ImplicitExceptionSpecification, bool> 7181Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7182 // C++ [class.copy]p5: 7183 // The implicitly-declared copy constructor for a class X will 7184 // have the form 7185 // 7186 // X::X(const X&) 7187 // 7188 // if 7189 // FIXME: It ought to be possible to store this on the record. 7190 bool HasConstCopyConstructor = true; 7191 7192 // -- each direct or virtual base class B of X has a copy 7193 // constructor whose first parameter is of type const B& or 7194 // const volatile B&, and 7195 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7196 BaseEnd = ClassDecl->bases_end(); 7197 HasConstCopyConstructor && Base != BaseEnd; 7198 ++Base) { 7199 // Virtual bases are handled below. 7200 if (Base->isVirtual()) 7201 continue; 7202 7203 CXXRecordDecl *BaseClassDecl 7204 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7205 LookupCopyConstructor(BaseClassDecl, Qualifiers::Const, 7206 &HasConstCopyConstructor); 7207 } 7208 7209 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7210 BaseEnd = ClassDecl->vbases_end(); 7211 HasConstCopyConstructor && Base != BaseEnd; 7212 ++Base) { 7213 CXXRecordDecl *BaseClassDecl 7214 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7215 LookupCopyConstructor(BaseClassDecl, Qualifiers::Const, 7216 &HasConstCopyConstructor); 7217 } 7218 7219 // -- for all the nonstatic data members of X that are of a 7220 // class type M (or array thereof), each such class type 7221 // has a copy constructor whose first parameter is of type 7222 // const M& or const volatile M&. 7223 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7224 FieldEnd = ClassDecl->field_end(); 7225 HasConstCopyConstructor && Field != FieldEnd; 7226 ++Field) { 7227 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7228 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7229 LookupCopyConstructor(FieldClassDecl, Qualifiers::Const, 7230 &HasConstCopyConstructor); 7231 } 7232 } 7233 // Otherwise, the implicitly declared copy constructor will have 7234 // the form 7235 // 7236 // X::X(X&) 7237 7238 // C++ [except.spec]p14: 7239 // An implicitly declared special member function (Clause 12) shall have an 7240 // exception-specification. [...] 7241 ImplicitExceptionSpecification ExceptSpec(Context); 7242 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7244 BaseEnd = ClassDecl->bases_end(); 7245 Base != BaseEnd; 7246 ++Base) { 7247 // Virtual bases are handled below. 7248 if (Base->isVirtual()) 7249 continue; 7250 7251 CXXRecordDecl *BaseClassDecl 7252 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7253 if (CXXConstructorDecl *CopyConstructor = 7254 LookupCopyConstructor(BaseClassDecl, Quals)) 7255 ExceptSpec.CalledDecl(CopyConstructor); 7256 } 7257 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7258 BaseEnd = ClassDecl->vbases_end(); 7259 Base != BaseEnd; 7260 ++Base) { 7261 CXXRecordDecl *BaseClassDecl 7262 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7263 if (CXXConstructorDecl *CopyConstructor = 7264 LookupCopyConstructor(BaseClassDecl, Quals)) 7265 ExceptSpec.CalledDecl(CopyConstructor); 7266 } 7267 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7268 FieldEnd = ClassDecl->field_end(); 7269 Field != FieldEnd; 7270 ++Field) { 7271 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7272 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7273 if (CXXConstructorDecl *CopyConstructor = 7274 LookupCopyConstructor(FieldClassDecl, Quals)) 7275 ExceptSpec.CalledDecl(CopyConstructor); 7276 } 7277 } 7278 7279 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7280} 7281 7282CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7283 CXXRecordDecl *ClassDecl) { 7284 // C++ [class.copy]p4: 7285 // If the class definition does not explicitly declare a copy 7286 // constructor, one is declared implicitly. 7287 7288 ImplicitExceptionSpecification Spec(Context); 7289 bool Const; 7290 llvm::tie(Spec, Const) = 7291 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7292 7293 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7294 QualType ArgType = ClassType; 7295 if (Const) 7296 ArgType = ArgType.withConst(); 7297 ArgType = Context.getLValueReferenceType(ArgType); 7298 7299 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7300 7301 DeclarationName Name 7302 = Context.DeclarationNames.getCXXConstructorName( 7303 Context.getCanonicalType(ClassType)); 7304 SourceLocation ClassLoc = ClassDecl->getLocation(); 7305 DeclarationNameInfo NameInfo(Name, ClassLoc); 7306 7307 // An implicitly-declared copy constructor is an inline public 7308 // member of its class. 7309 CXXConstructorDecl *CopyConstructor 7310 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7311 Context.getFunctionType(Context.VoidTy, 7312 &ArgType, 1, EPI), 7313 /*TInfo=*/0, 7314 /*isExplicit=*/false, 7315 /*isInline=*/true, 7316 /*isImplicitlyDeclared=*/true); 7317 CopyConstructor->setAccess(AS_public); 7318 CopyConstructor->setDefaulted(); 7319 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7320 7321 // Note that we have declared this constructor. 7322 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7323 7324 // Add the parameter to the constructor. 7325 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7326 ClassLoc, ClassLoc, 7327 /*IdentifierInfo=*/0, 7328 ArgType, /*TInfo=*/0, 7329 SC_None, 7330 SC_None, 0); 7331 CopyConstructor->setParams(&FromParam, 1); 7332 7333 if (Scope *S = getScopeForContext(ClassDecl)) 7334 PushOnScopeChains(CopyConstructor, S, false); 7335 ClassDecl->addDecl(CopyConstructor); 7336 7337 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7338 CopyConstructor->setDeletedAsWritten(); 7339 7340 return CopyConstructor; 7341} 7342 7343void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7344 CXXConstructorDecl *CopyConstructor) { 7345 assert((CopyConstructor->isDefaulted() && 7346 CopyConstructor->isCopyConstructor() && 7347 !CopyConstructor->doesThisDeclarationHaveABody()) && 7348 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7349 7350 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7351 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7352 7353 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7354 DiagnosticErrorTrap Trap(Diags); 7355 7356 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7357 Trap.hasErrorOccurred()) { 7358 Diag(CurrentLocation, diag::note_member_synthesized_at) 7359 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7360 CopyConstructor->setInvalidDecl(); 7361 } else { 7362 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7363 CopyConstructor->getLocation(), 7364 MultiStmtArg(*this, 0, 0), 7365 /*isStmtExpr=*/false) 7366 .takeAs<Stmt>()); 7367 } 7368 7369 CopyConstructor->setUsed(); 7370 7371 if (ASTMutationListener *L = getASTMutationListener()) { 7372 L->CompletedImplicitDefinition(CopyConstructor); 7373 } 7374} 7375 7376ExprResult 7377Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7378 CXXConstructorDecl *Constructor, 7379 MultiExprArg ExprArgs, 7380 bool RequiresZeroInit, 7381 unsigned ConstructKind, 7382 SourceRange ParenRange) { 7383 bool Elidable = false; 7384 7385 // C++0x [class.copy]p34: 7386 // When certain criteria are met, an implementation is allowed to 7387 // omit the copy/move construction of a class object, even if the 7388 // copy/move constructor and/or destructor for the object have 7389 // side effects. [...] 7390 // - when a temporary class object that has not been bound to a 7391 // reference (12.2) would be copied/moved to a class object 7392 // with the same cv-unqualified type, the copy/move operation 7393 // can be omitted by constructing the temporary object 7394 // directly into the target of the omitted copy/move 7395 if (ConstructKind == CXXConstructExpr::CK_Complete && 7396 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7397 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7398 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7399 } 7400 7401 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7402 Elidable, move(ExprArgs), RequiresZeroInit, 7403 ConstructKind, ParenRange); 7404} 7405 7406/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7407/// including handling of its default argument expressions. 7408ExprResult 7409Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7410 CXXConstructorDecl *Constructor, bool Elidable, 7411 MultiExprArg ExprArgs, 7412 bool RequiresZeroInit, 7413 unsigned ConstructKind, 7414 SourceRange ParenRange) { 7415 unsigned NumExprs = ExprArgs.size(); 7416 Expr **Exprs = (Expr **)ExprArgs.release(); 7417 7418 for (specific_attr_iterator<NonNullAttr> 7419 i = Constructor->specific_attr_begin<NonNullAttr>(), 7420 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7421 const NonNullAttr *NonNull = *i; 7422 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7423 } 7424 7425 MarkDeclarationReferenced(ConstructLoc, Constructor); 7426 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7427 Constructor, Elidable, Exprs, NumExprs, 7428 RequiresZeroInit, 7429 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7430 ParenRange)); 7431} 7432 7433bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7434 CXXConstructorDecl *Constructor, 7435 MultiExprArg Exprs) { 7436 // FIXME: Provide the correct paren SourceRange when available. 7437 ExprResult TempResult = 7438 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7439 move(Exprs), false, CXXConstructExpr::CK_Complete, 7440 SourceRange()); 7441 if (TempResult.isInvalid()) 7442 return true; 7443 7444 Expr *Temp = TempResult.takeAs<Expr>(); 7445 CheckImplicitConversions(Temp, VD->getLocation()); 7446 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7447 Temp = MaybeCreateExprWithCleanups(Temp); 7448 VD->setInit(Temp); 7449 7450 return false; 7451} 7452 7453void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7454 if (VD->isInvalidDecl()) return; 7455 7456 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7457 if (ClassDecl->isInvalidDecl()) return; 7458 if (ClassDecl->hasTrivialDestructor()) return; 7459 if (ClassDecl->isDependentContext()) return; 7460 7461 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7462 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7463 CheckDestructorAccess(VD->getLocation(), Destructor, 7464 PDiag(diag::err_access_dtor_var) 7465 << VD->getDeclName() 7466 << VD->getType()); 7467 7468 if (!VD->hasGlobalStorage()) return; 7469 7470 // Emit warning for non-trivial dtor in global scope (a real global, 7471 // class-static, function-static). 7472 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7473 7474 // TODO: this should be re-enabled for static locals by !CXAAtExit 7475 if (!VD->isStaticLocal()) 7476 Diag(VD->getLocation(), diag::warn_global_destructor); 7477} 7478 7479/// AddCXXDirectInitializerToDecl - This action is called immediately after 7480/// ActOnDeclarator, when a C++ direct initializer is present. 7481/// e.g: "int x(1);" 7482void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7483 SourceLocation LParenLoc, 7484 MultiExprArg Exprs, 7485 SourceLocation RParenLoc, 7486 bool TypeMayContainAuto) { 7487 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7488 7489 // If there is no declaration, there was an error parsing it. Just ignore 7490 // the initializer. 7491 if (RealDecl == 0) 7492 return; 7493 7494 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7495 if (!VDecl) { 7496 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7497 RealDecl->setInvalidDecl(); 7498 return; 7499 } 7500 7501 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7502 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7503 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7504 if (Exprs.size() > 1) { 7505 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7506 diag::err_auto_var_init_multiple_expressions) 7507 << VDecl->getDeclName() << VDecl->getType() 7508 << VDecl->getSourceRange(); 7509 RealDecl->setInvalidDecl(); 7510 return; 7511 } 7512 7513 Expr *Init = Exprs.get()[0]; 7514 TypeSourceInfo *DeducedType = 0; 7515 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7516 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7517 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7518 << Init->getSourceRange(); 7519 if (!DeducedType) { 7520 RealDecl->setInvalidDecl(); 7521 return; 7522 } 7523 VDecl->setTypeSourceInfo(DeducedType); 7524 VDecl->setType(DeducedType->getType()); 7525 7526 // If this is a redeclaration, check that the type we just deduced matches 7527 // the previously declared type. 7528 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7529 MergeVarDeclTypes(VDecl, Old); 7530 } 7531 7532 // We will represent direct-initialization similarly to copy-initialization: 7533 // int x(1); -as-> int x = 1; 7534 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7535 // 7536 // Clients that want to distinguish between the two forms, can check for 7537 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7538 // A major benefit is that clients that don't particularly care about which 7539 // exactly form was it (like the CodeGen) can handle both cases without 7540 // special case code. 7541 7542 // C++ 8.5p11: 7543 // The form of initialization (using parentheses or '=') is generally 7544 // insignificant, but does matter when the entity being initialized has a 7545 // class type. 7546 7547 if (!VDecl->getType()->isDependentType() && 7548 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7549 diag::err_typecheck_decl_incomplete_type)) { 7550 VDecl->setInvalidDecl(); 7551 return; 7552 } 7553 7554 // The variable can not have an abstract class type. 7555 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7556 diag::err_abstract_type_in_decl, 7557 AbstractVariableType)) 7558 VDecl->setInvalidDecl(); 7559 7560 const VarDecl *Def; 7561 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7562 Diag(VDecl->getLocation(), diag::err_redefinition) 7563 << VDecl->getDeclName(); 7564 Diag(Def->getLocation(), diag::note_previous_definition); 7565 VDecl->setInvalidDecl(); 7566 return; 7567 } 7568 7569 // C++ [class.static.data]p4 7570 // If a static data member is of const integral or const 7571 // enumeration type, its declaration in the class definition can 7572 // specify a constant-initializer which shall be an integral 7573 // constant expression (5.19). In that case, the member can appear 7574 // in integral constant expressions. The member shall still be 7575 // defined in a namespace scope if it is used in the program and the 7576 // namespace scope definition shall not contain an initializer. 7577 // 7578 // We already performed a redefinition check above, but for static 7579 // data members we also need to check whether there was an in-class 7580 // declaration with an initializer. 7581 const VarDecl* PrevInit = 0; 7582 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7583 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7584 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7585 return; 7586 } 7587 7588 bool IsDependent = false; 7589 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7590 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7591 VDecl->setInvalidDecl(); 7592 return; 7593 } 7594 7595 if (Exprs.get()[I]->isTypeDependent()) 7596 IsDependent = true; 7597 } 7598 7599 // If either the declaration has a dependent type or if any of the 7600 // expressions is type-dependent, we represent the initialization 7601 // via a ParenListExpr for later use during template instantiation. 7602 if (VDecl->getType()->isDependentType() || IsDependent) { 7603 // Let clients know that initialization was done with a direct initializer. 7604 VDecl->setCXXDirectInitializer(true); 7605 7606 // Store the initialization expressions as a ParenListExpr. 7607 unsigned NumExprs = Exprs.size(); 7608 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7609 (Expr **)Exprs.release(), 7610 NumExprs, RParenLoc)); 7611 return; 7612 } 7613 7614 // Capture the variable that is being initialized and the style of 7615 // initialization. 7616 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7617 7618 // FIXME: Poor source location information. 7619 InitializationKind Kind 7620 = InitializationKind::CreateDirect(VDecl->getLocation(), 7621 LParenLoc, RParenLoc); 7622 7623 InitializationSequence InitSeq(*this, Entity, Kind, 7624 Exprs.get(), Exprs.size()); 7625 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7626 if (Result.isInvalid()) { 7627 VDecl->setInvalidDecl(); 7628 return; 7629 } 7630 7631 CheckImplicitConversions(Result.get(), LParenLoc); 7632 7633 Result = MaybeCreateExprWithCleanups(Result); 7634 VDecl->setInit(Result.takeAs<Expr>()); 7635 VDecl->setCXXDirectInitializer(true); 7636 7637 CheckCompleteVariableDeclaration(VDecl); 7638} 7639 7640/// \brief Given a constructor and the set of arguments provided for the 7641/// constructor, convert the arguments and add any required default arguments 7642/// to form a proper call to this constructor. 7643/// 7644/// \returns true if an error occurred, false otherwise. 7645bool 7646Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7647 MultiExprArg ArgsPtr, 7648 SourceLocation Loc, 7649 ASTOwningVector<Expr*> &ConvertedArgs) { 7650 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7651 unsigned NumArgs = ArgsPtr.size(); 7652 Expr **Args = (Expr **)ArgsPtr.get(); 7653 7654 const FunctionProtoType *Proto 7655 = Constructor->getType()->getAs<FunctionProtoType>(); 7656 assert(Proto && "Constructor without a prototype?"); 7657 unsigned NumArgsInProto = Proto->getNumArgs(); 7658 7659 // If too few arguments are available, we'll fill in the rest with defaults. 7660 if (NumArgs < NumArgsInProto) 7661 ConvertedArgs.reserve(NumArgsInProto); 7662 else 7663 ConvertedArgs.reserve(NumArgs); 7664 7665 VariadicCallType CallType = 7666 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7667 llvm::SmallVector<Expr *, 8> AllArgs; 7668 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7669 Proto, 0, Args, NumArgs, AllArgs, 7670 CallType); 7671 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7672 ConvertedArgs.push_back(AllArgs[i]); 7673 return Invalid; 7674} 7675 7676static inline bool 7677CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7678 const FunctionDecl *FnDecl) { 7679 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7680 if (isa<NamespaceDecl>(DC)) { 7681 return SemaRef.Diag(FnDecl->getLocation(), 7682 diag::err_operator_new_delete_declared_in_namespace) 7683 << FnDecl->getDeclName(); 7684 } 7685 7686 if (isa<TranslationUnitDecl>(DC) && 7687 FnDecl->getStorageClass() == SC_Static) { 7688 return SemaRef.Diag(FnDecl->getLocation(), 7689 diag::err_operator_new_delete_declared_static) 7690 << FnDecl->getDeclName(); 7691 } 7692 7693 return false; 7694} 7695 7696static inline bool 7697CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7698 CanQualType ExpectedResultType, 7699 CanQualType ExpectedFirstParamType, 7700 unsigned DependentParamTypeDiag, 7701 unsigned InvalidParamTypeDiag) { 7702 QualType ResultType = 7703 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7704 7705 // Check that the result type is not dependent. 7706 if (ResultType->isDependentType()) 7707 return SemaRef.Diag(FnDecl->getLocation(), 7708 diag::err_operator_new_delete_dependent_result_type) 7709 << FnDecl->getDeclName() << ExpectedResultType; 7710 7711 // Check that the result type is what we expect. 7712 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7713 return SemaRef.Diag(FnDecl->getLocation(), 7714 diag::err_operator_new_delete_invalid_result_type) 7715 << FnDecl->getDeclName() << ExpectedResultType; 7716 7717 // A function template must have at least 2 parameters. 7718 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7719 return SemaRef.Diag(FnDecl->getLocation(), 7720 diag::err_operator_new_delete_template_too_few_parameters) 7721 << FnDecl->getDeclName(); 7722 7723 // The function decl must have at least 1 parameter. 7724 if (FnDecl->getNumParams() == 0) 7725 return SemaRef.Diag(FnDecl->getLocation(), 7726 diag::err_operator_new_delete_too_few_parameters) 7727 << FnDecl->getDeclName(); 7728 7729 // Check the the first parameter type is not dependent. 7730 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7731 if (FirstParamType->isDependentType()) 7732 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7733 << FnDecl->getDeclName() << ExpectedFirstParamType; 7734 7735 // Check that the first parameter type is what we expect. 7736 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7737 ExpectedFirstParamType) 7738 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7739 << FnDecl->getDeclName() << ExpectedFirstParamType; 7740 7741 return false; 7742} 7743 7744static bool 7745CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7746 // C++ [basic.stc.dynamic.allocation]p1: 7747 // A program is ill-formed if an allocation function is declared in a 7748 // namespace scope other than global scope or declared static in global 7749 // scope. 7750 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7751 return true; 7752 7753 CanQualType SizeTy = 7754 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7755 7756 // C++ [basic.stc.dynamic.allocation]p1: 7757 // The return type shall be void*. The first parameter shall have type 7758 // std::size_t. 7759 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7760 SizeTy, 7761 diag::err_operator_new_dependent_param_type, 7762 diag::err_operator_new_param_type)) 7763 return true; 7764 7765 // C++ [basic.stc.dynamic.allocation]p1: 7766 // The first parameter shall not have an associated default argument. 7767 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7768 return SemaRef.Diag(FnDecl->getLocation(), 7769 diag::err_operator_new_default_arg) 7770 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7771 7772 return false; 7773} 7774 7775static bool 7776CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7777 // C++ [basic.stc.dynamic.deallocation]p1: 7778 // A program is ill-formed if deallocation functions are declared in a 7779 // namespace scope other than global scope or declared static in global 7780 // scope. 7781 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7782 return true; 7783 7784 // C++ [basic.stc.dynamic.deallocation]p2: 7785 // Each deallocation function shall return void and its first parameter 7786 // shall be void*. 7787 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7788 SemaRef.Context.VoidPtrTy, 7789 diag::err_operator_delete_dependent_param_type, 7790 diag::err_operator_delete_param_type)) 7791 return true; 7792 7793 return false; 7794} 7795 7796/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7797/// of this overloaded operator is well-formed. If so, returns false; 7798/// otherwise, emits appropriate diagnostics and returns true. 7799bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7800 assert(FnDecl && FnDecl->isOverloadedOperator() && 7801 "Expected an overloaded operator declaration"); 7802 7803 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7804 7805 // C++ [over.oper]p5: 7806 // The allocation and deallocation functions, operator new, 7807 // operator new[], operator delete and operator delete[], are 7808 // described completely in 3.7.3. The attributes and restrictions 7809 // found in the rest of this subclause do not apply to them unless 7810 // explicitly stated in 3.7.3. 7811 if (Op == OO_Delete || Op == OO_Array_Delete) 7812 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7813 7814 if (Op == OO_New || Op == OO_Array_New) 7815 return CheckOperatorNewDeclaration(*this, FnDecl); 7816 7817 // C++ [over.oper]p6: 7818 // An operator function shall either be a non-static member 7819 // function or be a non-member function and have at least one 7820 // parameter whose type is a class, a reference to a class, an 7821 // enumeration, or a reference to an enumeration. 7822 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7823 if (MethodDecl->isStatic()) 7824 return Diag(FnDecl->getLocation(), 7825 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7826 } else { 7827 bool ClassOrEnumParam = false; 7828 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7829 ParamEnd = FnDecl->param_end(); 7830 Param != ParamEnd; ++Param) { 7831 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7832 if (ParamType->isDependentType() || ParamType->isRecordType() || 7833 ParamType->isEnumeralType()) { 7834 ClassOrEnumParam = true; 7835 break; 7836 } 7837 } 7838 7839 if (!ClassOrEnumParam) 7840 return Diag(FnDecl->getLocation(), 7841 diag::err_operator_overload_needs_class_or_enum) 7842 << FnDecl->getDeclName(); 7843 } 7844 7845 // C++ [over.oper]p8: 7846 // An operator function cannot have default arguments (8.3.6), 7847 // except where explicitly stated below. 7848 // 7849 // Only the function-call operator allows default arguments 7850 // (C++ [over.call]p1). 7851 if (Op != OO_Call) { 7852 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7853 Param != FnDecl->param_end(); ++Param) { 7854 if ((*Param)->hasDefaultArg()) 7855 return Diag((*Param)->getLocation(), 7856 diag::err_operator_overload_default_arg) 7857 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7858 } 7859 } 7860 7861 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7862 { false, false, false } 7863#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7864 , { Unary, Binary, MemberOnly } 7865#include "clang/Basic/OperatorKinds.def" 7866 }; 7867 7868 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7869 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7870 bool MustBeMemberOperator = OperatorUses[Op][2]; 7871 7872 // C++ [over.oper]p8: 7873 // [...] Operator functions cannot have more or fewer parameters 7874 // than the number required for the corresponding operator, as 7875 // described in the rest of this subclause. 7876 unsigned NumParams = FnDecl->getNumParams() 7877 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7878 if (Op != OO_Call && 7879 ((NumParams == 1 && !CanBeUnaryOperator) || 7880 (NumParams == 2 && !CanBeBinaryOperator) || 7881 (NumParams < 1) || (NumParams > 2))) { 7882 // We have the wrong number of parameters. 7883 unsigned ErrorKind; 7884 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7885 ErrorKind = 2; // 2 -> unary or binary. 7886 } else if (CanBeUnaryOperator) { 7887 ErrorKind = 0; // 0 -> unary 7888 } else { 7889 assert(CanBeBinaryOperator && 7890 "All non-call overloaded operators are unary or binary!"); 7891 ErrorKind = 1; // 1 -> binary 7892 } 7893 7894 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7895 << FnDecl->getDeclName() << NumParams << ErrorKind; 7896 } 7897 7898 // Overloaded operators other than operator() cannot be variadic. 7899 if (Op != OO_Call && 7900 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7901 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7902 << FnDecl->getDeclName(); 7903 } 7904 7905 // Some operators must be non-static member functions. 7906 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7907 return Diag(FnDecl->getLocation(), 7908 diag::err_operator_overload_must_be_member) 7909 << FnDecl->getDeclName(); 7910 } 7911 7912 // C++ [over.inc]p1: 7913 // The user-defined function called operator++ implements the 7914 // prefix and postfix ++ operator. If this function is a member 7915 // function with no parameters, or a non-member function with one 7916 // parameter of class or enumeration type, it defines the prefix 7917 // increment operator ++ for objects of that type. If the function 7918 // is a member function with one parameter (which shall be of type 7919 // int) or a non-member function with two parameters (the second 7920 // of which shall be of type int), it defines the postfix 7921 // increment operator ++ for objects of that type. 7922 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7923 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7924 bool ParamIsInt = false; 7925 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7926 ParamIsInt = BT->getKind() == BuiltinType::Int; 7927 7928 if (!ParamIsInt) 7929 return Diag(LastParam->getLocation(), 7930 diag::err_operator_overload_post_incdec_must_be_int) 7931 << LastParam->getType() << (Op == OO_MinusMinus); 7932 } 7933 7934 return false; 7935} 7936 7937/// CheckLiteralOperatorDeclaration - Check whether the declaration 7938/// of this literal operator function is well-formed. If so, returns 7939/// false; otherwise, emits appropriate diagnostics and returns true. 7940bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7941 DeclContext *DC = FnDecl->getDeclContext(); 7942 Decl::Kind Kind = DC->getDeclKind(); 7943 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7944 Kind != Decl::LinkageSpec) { 7945 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7946 << FnDecl->getDeclName(); 7947 return true; 7948 } 7949 7950 bool Valid = false; 7951 7952 // template <char...> type operator "" name() is the only valid template 7953 // signature, and the only valid signature with no parameters. 7954 if (FnDecl->param_size() == 0) { 7955 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7956 // Must have only one template parameter 7957 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7958 if (Params->size() == 1) { 7959 NonTypeTemplateParmDecl *PmDecl = 7960 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7961 7962 // The template parameter must be a char parameter pack. 7963 if (PmDecl && PmDecl->isTemplateParameterPack() && 7964 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7965 Valid = true; 7966 } 7967 } 7968 } else { 7969 // Check the first parameter 7970 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7971 7972 QualType T = (*Param)->getType(); 7973 7974 // unsigned long long int, long double, and any character type are allowed 7975 // as the only parameters. 7976 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7977 Context.hasSameType(T, Context.LongDoubleTy) || 7978 Context.hasSameType(T, Context.CharTy) || 7979 Context.hasSameType(T, Context.WCharTy) || 7980 Context.hasSameType(T, Context.Char16Ty) || 7981 Context.hasSameType(T, Context.Char32Ty)) { 7982 if (++Param == FnDecl->param_end()) 7983 Valid = true; 7984 goto FinishedParams; 7985 } 7986 7987 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7988 const PointerType *PT = T->getAs<PointerType>(); 7989 if (!PT) 7990 goto FinishedParams; 7991 T = PT->getPointeeType(); 7992 if (!T.isConstQualified()) 7993 goto FinishedParams; 7994 T = T.getUnqualifiedType(); 7995 7996 // Move on to the second parameter; 7997 ++Param; 7998 7999 // If there is no second parameter, the first must be a const char * 8000 if (Param == FnDecl->param_end()) { 8001 if (Context.hasSameType(T, Context.CharTy)) 8002 Valid = true; 8003 goto FinishedParams; 8004 } 8005 8006 // const char *, const wchar_t*, const char16_t*, and const char32_t* 8007 // are allowed as the first parameter to a two-parameter function 8008 if (!(Context.hasSameType(T, Context.CharTy) || 8009 Context.hasSameType(T, Context.WCharTy) || 8010 Context.hasSameType(T, Context.Char16Ty) || 8011 Context.hasSameType(T, Context.Char32Ty))) 8012 goto FinishedParams; 8013 8014 // The second and final parameter must be an std::size_t 8015 T = (*Param)->getType().getUnqualifiedType(); 8016 if (Context.hasSameType(T, Context.getSizeType()) && 8017 ++Param == FnDecl->param_end()) 8018 Valid = true; 8019 } 8020 8021 // FIXME: This diagnostic is absolutely terrible. 8022FinishedParams: 8023 if (!Valid) { 8024 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 8025 << FnDecl->getDeclName(); 8026 return true; 8027 } 8028 8029 return false; 8030} 8031 8032/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 8033/// linkage specification, including the language and (if present) 8034/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 8035/// the location of the language string literal, which is provided 8036/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 8037/// the '{' brace. Otherwise, this linkage specification does not 8038/// have any braces. 8039Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 8040 SourceLocation LangLoc, 8041 llvm::StringRef Lang, 8042 SourceLocation LBraceLoc) { 8043 LinkageSpecDecl::LanguageIDs Language; 8044 if (Lang == "\"C\"") 8045 Language = LinkageSpecDecl::lang_c; 8046 else if (Lang == "\"C++\"") 8047 Language = LinkageSpecDecl::lang_cxx; 8048 else { 8049 Diag(LangLoc, diag::err_bad_language); 8050 return 0; 8051 } 8052 8053 // FIXME: Add all the various semantics of linkage specifications 8054 8055 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 8056 ExternLoc, LangLoc, Language); 8057 CurContext->addDecl(D); 8058 PushDeclContext(S, D); 8059 return D; 8060} 8061 8062/// ActOnFinishLinkageSpecification - Complete the definition of 8063/// the C++ linkage specification LinkageSpec. If RBraceLoc is 8064/// valid, it's the position of the closing '}' brace in a linkage 8065/// specification that uses braces. 8066Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 8067 Decl *LinkageSpec, 8068 SourceLocation RBraceLoc) { 8069 if (LinkageSpec) { 8070 if (RBraceLoc.isValid()) { 8071 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 8072 LSDecl->setRBraceLoc(RBraceLoc); 8073 } 8074 PopDeclContext(); 8075 } 8076 return LinkageSpec; 8077} 8078 8079/// \brief Perform semantic analysis for the variable declaration that 8080/// occurs within a C++ catch clause, returning the newly-created 8081/// variable. 8082VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 8083 TypeSourceInfo *TInfo, 8084 SourceLocation StartLoc, 8085 SourceLocation Loc, 8086 IdentifierInfo *Name) { 8087 bool Invalid = false; 8088 QualType ExDeclType = TInfo->getType(); 8089 8090 // Arrays and functions decay. 8091 if (ExDeclType->isArrayType()) 8092 ExDeclType = Context.getArrayDecayedType(ExDeclType); 8093 else if (ExDeclType->isFunctionType()) 8094 ExDeclType = Context.getPointerType(ExDeclType); 8095 8096 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 8097 // The exception-declaration shall not denote a pointer or reference to an 8098 // incomplete type, other than [cv] void*. 8099 // N2844 forbids rvalue references. 8100 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 8101 Diag(Loc, diag::err_catch_rvalue_ref); 8102 Invalid = true; 8103 } 8104 8105 // GCC allows catching pointers and references to incomplete types 8106 // as an extension; so do we, but we warn by default. 8107 8108 QualType BaseType = ExDeclType; 8109 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8110 unsigned DK = diag::err_catch_incomplete; 8111 bool IncompleteCatchIsInvalid = true; 8112 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8113 BaseType = Ptr->getPointeeType(); 8114 Mode = 1; 8115 DK = diag::ext_catch_incomplete_ptr; 8116 IncompleteCatchIsInvalid = false; 8117 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8118 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8119 BaseType = Ref->getPointeeType(); 8120 Mode = 2; 8121 DK = diag::ext_catch_incomplete_ref; 8122 IncompleteCatchIsInvalid = false; 8123 } 8124 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8125 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8126 IncompleteCatchIsInvalid) 8127 Invalid = true; 8128 8129 if (!Invalid && !ExDeclType->isDependentType() && 8130 RequireNonAbstractType(Loc, ExDeclType, 8131 diag::err_abstract_type_in_decl, 8132 AbstractVariableType)) 8133 Invalid = true; 8134 8135 // Only the non-fragile NeXT runtime currently supports C++ catches 8136 // of ObjC types, and no runtime supports catching ObjC types by value. 8137 if (!Invalid && getLangOptions().ObjC1) { 8138 QualType T = ExDeclType; 8139 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8140 T = RT->getPointeeType(); 8141 8142 if (T->isObjCObjectType()) { 8143 Diag(Loc, diag::err_objc_object_catch); 8144 Invalid = true; 8145 } else if (T->isObjCObjectPointerType()) { 8146 if (!getLangOptions().ObjCNonFragileABI) { 8147 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 8148 Invalid = true; 8149 } 8150 } 8151 } 8152 8153 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8154 ExDeclType, TInfo, SC_None, SC_None); 8155 ExDecl->setExceptionVariable(true); 8156 8157 if (!Invalid) { 8158 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8159 // C++ [except.handle]p16: 8160 // The object declared in an exception-declaration or, if the 8161 // exception-declaration does not specify a name, a temporary (12.2) is 8162 // copy-initialized (8.5) from the exception object. [...] 8163 // The object is destroyed when the handler exits, after the destruction 8164 // of any automatic objects initialized within the handler. 8165 // 8166 // We just pretend to initialize the object with itself, then make sure 8167 // it can be destroyed later. 8168 QualType initType = ExDeclType; 8169 8170 InitializedEntity entity = 8171 InitializedEntity::InitializeVariable(ExDecl); 8172 InitializationKind initKind = 8173 InitializationKind::CreateCopy(Loc, SourceLocation()); 8174 8175 Expr *opaqueValue = 8176 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8177 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8178 ExprResult result = sequence.Perform(*this, entity, initKind, 8179 MultiExprArg(&opaqueValue, 1)); 8180 if (result.isInvalid()) 8181 Invalid = true; 8182 else { 8183 // If the constructor used was non-trivial, set this as the 8184 // "initializer". 8185 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8186 if (!construct->getConstructor()->isTrivial()) { 8187 Expr *init = MaybeCreateExprWithCleanups(construct); 8188 ExDecl->setInit(init); 8189 } 8190 8191 // And make sure it's destructable. 8192 FinalizeVarWithDestructor(ExDecl, recordType); 8193 } 8194 } 8195 } 8196 8197 if (Invalid) 8198 ExDecl->setInvalidDecl(); 8199 8200 return ExDecl; 8201} 8202 8203/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8204/// handler. 8205Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8206 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8207 bool Invalid = D.isInvalidType(); 8208 8209 // Check for unexpanded parameter packs. 8210 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8211 UPPC_ExceptionType)) { 8212 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8213 D.getIdentifierLoc()); 8214 Invalid = true; 8215 } 8216 8217 IdentifierInfo *II = D.getIdentifier(); 8218 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8219 LookupOrdinaryName, 8220 ForRedeclaration)) { 8221 // The scope should be freshly made just for us. There is just no way 8222 // it contains any previous declaration. 8223 assert(!S->isDeclScope(PrevDecl)); 8224 if (PrevDecl->isTemplateParameter()) { 8225 // Maybe we will complain about the shadowed template parameter. 8226 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8227 } 8228 } 8229 8230 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8231 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8232 << D.getCXXScopeSpec().getRange(); 8233 Invalid = true; 8234 } 8235 8236 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8237 D.getSourceRange().getBegin(), 8238 D.getIdentifierLoc(), 8239 D.getIdentifier()); 8240 if (Invalid) 8241 ExDecl->setInvalidDecl(); 8242 8243 // Add the exception declaration into this scope. 8244 if (II) 8245 PushOnScopeChains(ExDecl, S); 8246 else 8247 CurContext->addDecl(ExDecl); 8248 8249 ProcessDeclAttributes(S, ExDecl, D); 8250 return ExDecl; 8251} 8252 8253Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8254 Expr *AssertExpr, 8255 Expr *AssertMessageExpr_, 8256 SourceLocation RParenLoc) { 8257 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8258 8259 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8260 llvm::APSInt Value(32); 8261 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8262 Diag(StaticAssertLoc, 8263 diag::err_static_assert_expression_is_not_constant) << 8264 AssertExpr->getSourceRange(); 8265 return 0; 8266 } 8267 8268 if (Value == 0) { 8269 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8270 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8271 } 8272 } 8273 8274 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8275 return 0; 8276 8277 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8278 AssertExpr, AssertMessage, RParenLoc); 8279 8280 CurContext->addDecl(Decl); 8281 return Decl; 8282} 8283 8284/// \brief Perform semantic analysis of the given friend type declaration. 8285/// 8286/// \returns A friend declaration that. 8287FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8288 TypeSourceInfo *TSInfo) { 8289 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8290 8291 QualType T = TSInfo->getType(); 8292 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8293 8294 if (!getLangOptions().CPlusPlus0x) { 8295 // C++03 [class.friend]p2: 8296 // An elaborated-type-specifier shall be used in a friend declaration 8297 // for a class.* 8298 // 8299 // * The class-key of the elaborated-type-specifier is required. 8300 if (!ActiveTemplateInstantiations.empty()) { 8301 // Do not complain about the form of friend template types during 8302 // template instantiation; we will already have complained when the 8303 // template was declared. 8304 } else if (!T->isElaboratedTypeSpecifier()) { 8305 // If we evaluated the type to a record type, suggest putting 8306 // a tag in front. 8307 if (const RecordType *RT = T->getAs<RecordType>()) { 8308 RecordDecl *RD = RT->getDecl(); 8309 8310 std::string InsertionText = std::string(" ") + RD->getKindName(); 8311 8312 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8313 << (unsigned) RD->getTagKind() 8314 << T 8315 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8316 InsertionText); 8317 } else { 8318 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8319 << T 8320 << SourceRange(FriendLoc, TypeRange.getEnd()); 8321 } 8322 } else if (T->getAs<EnumType>()) { 8323 Diag(FriendLoc, diag::ext_enum_friend) 8324 << T 8325 << SourceRange(FriendLoc, TypeRange.getEnd()); 8326 } 8327 } 8328 8329 // C++0x [class.friend]p3: 8330 // If the type specifier in a friend declaration designates a (possibly 8331 // cv-qualified) class type, that class is declared as a friend; otherwise, 8332 // the friend declaration is ignored. 8333 8334 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8335 // in [class.friend]p3 that we do not implement. 8336 8337 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8338} 8339 8340/// Handle a friend tag declaration where the scope specifier was 8341/// templated. 8342Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8343 unsigned TagSpec, SourceLocation TagLoc, 8344 CXXScopeSpec &SS, 8345 IdentifierInfo *Name, SourceLocation NameLoc, 8346 AttributeList *Attr, 8347 MultiTemplateParamsArg TempParamLists) { 8348 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8349 8350 bool isExplicitSpecialization = false; 8351 bool Invalid = false; 8352 8353 if (TemplateParameterList *TemplateParams 8354 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8355 TempParamLists.get(), 8356 TempParamLists.size(), 8357 /*friend*/ true, 8358 isExplicitSpecialization, 8359 Invalid)) { 8360 if (TemplateParams->size() > 0) { 8361 // This is a declaration of a class template. 8362 if (Invalid) 8363 return 0; 8364 8365 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8366 SS, Name, NameLoc, Attr, 8367 TemplateParams, AS_public, 8368 TempParamLists.size() - 1, 8369 (TemplateParameterList**) TempParamLists.release()).take(); 8370 } else { 8371 // The "template<>" header is extraneous. 8372 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8373 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8374 isExplicitSpecialization = true; 8375 } 8376 } 8377 8378 if (Invalid) return 0; 8379 8380 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8381 8382 bool isAllExplicitSpecializations = true; 8383 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8384 if (TempParamLists.get()[I]->size()) { 8385 isAllExplicitSpecializations = false; 8386 break; 8387 } 8388 } 8389 8390 // FIXME: don't ignore attributes. 8391 8392 // If it's explicit specializations all the way down, just forget 8393 // about the template header and build an appropriate non-templated 8394 // friend. TODO: for source fidelity, remember the headers. 8395 if (isAllExplicitSpecializations) { 8396 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8397 ElaboratedTypeKeyword Keyword 8398 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8399 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8400 *Name, NameLoc); 8401 if (T.isNull()) 8402 return 0; 8403 8404 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8405 if (isa<DependentNameType>(T)) { 8406 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8407 TL.setKeywordLoc(TagLoc); 8408 TL.setQualifierLoc(QualifierLoc); 8409 TL.setNameLoc(NameLoc); 8410 } else { 8411 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8412 TL.setKeywordLoc(TagLoc); 8413 TL.setQualifierLoc(QualifierLoc); 8414 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8415 } 8416 8417 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8418 TSI, FriendLoc); 8419 Friend->setAccess(AS_public); 8420 CurContext->addDecl(Friend); 8421 return Friend; 8422 } 8423 8424 // Handle the case of a templated-scope friend class. e.g. 8425 // template <class T> class A<T>::B; 8426 // FIXME: we don't support these right now. 8427 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8428 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8429 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8430 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8431 TL.setKeywordLoc(TagLoc); 8432 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8433 TL.setNameLoc(NameLoc); 8434 8435 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8436 TSI, FriendLoc); 8437 Friend->setAccess(AS_public); 8438 Friend->setUnsupportedFriend(true); 8439 CurContext->addDecl(Friend); 8440 return Friend; 8441} 8442 8443 8444/// Handle a friend type declaration. This works in tandem with 8445/// ActOnTag. 8446/// 8447/// Notes on friend class templates: 8448/// 8449/// We generally treat friend class declarations as if they were 8450/// declaring a class. So, for example, the elaborated type specifier 8451/// in a friend declaration is required to obey the restrictions of a 8452/// class-head (i.e. no typedefs in the scope chain), template 8453/// parameters are required to match up with simple template-ids, &c. 8454/// However, unlike when declaring a template specialization, it's 8455/// okay to refer to a template specialization without an empty 8456/// template parameter declaration, e.g. 8457/// friend class A<T>::B<unsigned>; 8458/// We permit this as a special case; if there are any template 8459/// parameters present at all, require proper matching, i.e. 8460/// template <> template <class T> friend class A<int>::B; 8461Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8462 MultiTemplateParamsArg TempParams) { 8463 SourceLocation Loc = DS.getSourceRange().getBegin(); 8464 8465 assert(DS.isFriendSpecified()); 8466 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8467 8468 // Try to convert the decl specifier to a type. This works for 8469 // friend templates because ActOnTag never produces a ClassTemplateDecl 8470 // for a TUK_Friend. 8471 Declarator TheDeclarator(DS, Declarator::MemberContext); 8472 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8473 QualType T = TSI->getType(); 8474 if (TheDeclarator.isInvalidType()) 8475 return 0; 8476 8477 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8478 return 0; 8479 8480 // This is definitely an error in C++98. It's probably meant to 8481 // be forbidden in C++0x, too, but the specification is just 8482 // poorly written. 8483 // 8484 // The problem is with declarations like the following: 8485 // template <T> friend A<T>::foo; 8486 // where deciding whether a class C is a friend or not now hinges 8487 // on whether there exists an instantiation of A that causes 8488 // 'foo' to equal C. There are restrictions on class-heads 8489 // (which we declare (by fiat) elaborated friend declarations to 8490 // be) that makes this tractable. 8491 // 8492 // FIXME: handle "template <> friend class A<T>;", which 8493 // is possibly well-formed? Who even knows? 8494 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8495 Diag(Loc, diag::err_tagless_friend_type_template) 8496 << DS.getSourceRange(); 8497 return 0; 8498 } 8499 8500 // C++98 [class.friend]p1: A friend of a class is a function 8501 // or class that is not a member of the class . . . 8502 // This is fixed in DR77, which just barely didn't make the C++03 8503 // deadline. It's also a very silly restriction that seriously 8504 // affects inner classes and which nobody else seems to implement; 8505 // thus we never diagnose it, not even in -pedantic. 8506 // 8507 // But note that we could warn about it: it's always useless to 8508 // friend one of your own members (it's not, however, worthless to 8509 // friend a member of an arbitrary specialization of your template). 8510 8511 Decl *D; 8512 if (unsigned NumTempParamLists = TempParams.size()) 8513 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8514 NumTempParamLists, 8515 TempParams.release(), 8516 TSI, 8517 DS.getFriendSpecLoc()); 8518 else 8519 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8520 8521 if (!D) 8522 return 0; 8523 8524 D->setAccess(AS_public); 8525 CurContext->addDecl(D); 8526 8527 return D; 8528} 8529 8530Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8531 MultiTemplateParamsArg TemplateParams) { 8532 const DeclSpec &DS = D.getDeclSpec(); 8533 8534 assert(DS.isFriendSpecified()); 8535 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8536 8537 SourceLocation Loc = D.getIdentifierLoc(); 8538 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8539 QualType T = TInfo->getType(); 8540 8541 // C++ [class.friend]p1 8542 // A friend of a class is a function or class.... 8543 // Note that this sees through typedefs, which is intended. 8544 // It *doesn't* see through dependent types, which is correct 8545 // according to [temp.arg.type]p3: 8546 // If a declaration acquires a function type through a 8547 // type dependent on a template-parameter and this causes 8548 // a declaration that does not use the syntactic form of a 8549 // function declarator to have a function type, the program 8550 // is ill-formed. 8551 if (!T->isFunctionType()) { 8552 Diag(Loc, diag::err_unexpected_friend); 8553 8554 // It might be worthwhile to try to recover by creating an 8555 // appropriate declaration. 8556 return 0; 8557 } 8558 8559 // C++ [namespace.memdef]p3 8560 // - If a friend declaration in a non-local class first declares a 8561 // class or function, the friend class or function is a member 8562 // of the innermost enclosing namespace. 8563 // - The name of the friend is not found by simple name lookup 8564 // until a matching declaration is provided in that namespace 8565 // scope (either before or after the class declaration granting 8566 // friendship). 8567 // - If a friend function is called, its name may be found by the 8568 // name lookup that considers functions from namespaces and 8569 // classes associated with the types of the function arguments. 8570 // - When looking for a prior declaration of a class or a function 8571 // declared as a friend, scopes outside the innermost enclosing 8572 // namespace scope are not considered. 8573 8574 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8575 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8576 DeclarationName Name = NameInfo.getName(); 8577 assert(Name); 8578 8579 // Check for unexpanded parameter packs. 8580 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8581 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8582 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8583 return 0; 8584 8585 // The context we found the declaration in, or in which we should 8586 // create the declaration. 8587 DeclContext *DC; 8588 Scope *DCScope = S; 8589 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8590 ForRedeclaration); 8591 8592 // FIXME: there are different rules in local classes 8593 8594 // There are four cases here. 8595 // - There's no scope specifier, in which case we just go to the 8596 // appropriate scope and look for a function or function template 8597 // there as appropriate. 8598 // Recover from invalid scope qualifiers as if they just weren't there. 8599 if (SS.isInvalid() || !SS.isSet()) { 8600 // C++0x [namespace.memdef]p3: 8601 // If the name in a friend declaration is neither qualified nor 8602 // a template-id and the declaration is a function or an 8603 // elaborated-type-specifier, the lookup to determine whether 8604 // the entity has been previously declared shall not consider 8605 // any scopes outside the innermost enclosing namespace. 8606 // C++0x [class.friend]p11: 8607 // If a friend declaration appears in a local class and the name 8608 // specified is an unqualified name, a prior declaration is 8609 // looked up without considering scopes that are outside the 8610 // innermost enclosing non-class scope. For a friend function 8611 // declaration, if there is no prior declaration, the program is 8612 // ill-formed. 8613 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8614 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8615 8616 // Find the appropriate context according to the above. 8617 DC = CurContext; 8618 while (true) { 8619 // Skip class contexts. If someone can cite chapter and verse 8620 // for this behavior, that would be nice --- it's what GCC and 8621 // EDG do, and it seems like a reasonable intent, but the spec 8622 // really only says that checks for unqualified existing 8623 // declarations should stop at the nearest enclosing namespace, 8624 // not that they should only consider the nearest enclosing 8625 // namespace. 8626 while (DC->isRecord()) 8627 DC = DC->getParent(); 8628 8629 LookupQualifiedName(Previous, DC); 8630 8631 // TODO: decide what we think about using declarations. 8632 if (isLocal || !Previous.empty()) 8633 break; 8634 8635 if (isTemplateId) { 8636 if (isa<TranslationUnitDecl>(DC)) break; 8637 } else { 8638 if (DC->isFileContext()) break; 8639 } 8640 DC = DC->getParent(); 8641 } 8642 8643 // C++ [class.friend]p1: A friend of a class is a function or 8644 // class that is not a member of the class . . . 8645 // C++0x changes this for both friend types and functions. 8646 // Most C++ 98 compilers do seem to give an error here, so 8647 // we do, too. 8648 if (!Previous.empty() && DC->Equals(CurContext) 8649 && !getLangOptions().CPlusPlus0x) 8650 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8651 8652 DCScope = getScopeForDeclContext(S, DC); 8653 8654 // - There's a non-dependent scope specifier, in which case we 8655 // compute it and do a previous lookup there for a function 8656 // or function template. 8657 } else if (!SS.getScopeRep()->isDependent()) { 8658 DC = computeDeclContext(SS); 8659 if (!DC) return 0; 8660 8661 if (RequireCompleteDeclContext(SS, DC)) return 0; 8662 8663 LookupQualifiedName(Previous, DC); 8664 8665 // Ignore things found implicitly in the wrong scope. 8666 // TODO: better diagnostics for this case. Suggesting the right 8667 // qualified scope would be nice... 8668 LookupResult::Filter F = Previous.makeFilter(); 8669 while (F.hasNext()) { 8670 NamedDecl *D = F.next(); 8671 if (!DC->InEnclosingNamespaceSetOf( 8672 D->getDeclContext()->getRedeclContext())) 8673 F.erase(); 8674 } 8675 F.done(); 8676 8677 if (Previous.empty()) { 8678 D.setInvalidType(); 8679 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8680 return 0; 8681 } 8682 8683 // C++ [class.friend]p1: A friend of a class is a function or 8684 // class that is not a member of the class . . . 8685 if (DC->Equals(CurContext)) 8686 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8687 8688 // - There's a scope specifier that does not match any template 8689 // parameter lists, in which case we use some arbitrary context, 8690 // create a method or method template, and wait for instantiation. 8691 // - There's a scope specifier that does match some template 8692 // parameter lists, which we don't handle right now. 8693 } else { 8694 DC = CurContext; 8695 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8696 } 8697 8698 if (!DC->isRecord()) { 8699 // This implies that it has to be an operator or function. 8700 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8701 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8702 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8703 Diag(Loc, diag::err_introducing_special_friend) << 8704 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8705 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8706 return 0; 8707 } 8708 } 8709 8710 bool Redeclaration = false; 8711 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8712 move(TemplateParams), 8713 IsDefinition, 8714 Redeclaration); 8715 if (!ND) return 0; 8716 8717 assert(ND->getDeclContext() == DC); 8718 assert(ND->getLexicalDeclContext() == CurContext); 8719 8720 // Add the function declaration to the appropriate lookup tables, 8721 // adjusting the redeclarations list as necessary. We don't 8722 // want to do this yet if the friending class is dependent. 8723 // 8724 // Also update the scope-based lookup if the target context's 8725 // lookup context is in lexical scope. 8726 if (!CurContext->isDependentContext()) { 8727 DC = DC->getRedeclContext(); 8728 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8729 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8730 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8731 } 8732 8733 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8734 D.getIdentifierLoc(), ND, 8735 DS.getFriendSpecLoc()); 8736 FrD->setAccess(AS_public); 8737 CurContext->addDecl(FrD); 8738 8739 if (ND->isInvalidDecl()) 8740 FrD->setInvalidDecl(); 8741 else { 8742 FunctionDecl *FD; 8743 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8744 FD = FTD->getTemplatedDecl(); 8745 else 8746 FD = cast<FunctionDecl>(ND); 8747 8748 // Mark templated-scope function declarations as unsupported. 8749 if (FD->getNumTemplateParameterLists()) 8750 FrD->setUnsupportedFriend(true); 8751 } 8752 8753 return ND; 8754} 8755 8756void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8757 AdjustDeclIfTemplate(Dcl); 8758 8759 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8760 if (!Fn) { 8761 Diag(DelLoc, diag::err_deleted_non_function); 8762 return; 8763 } 8764 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8765 Diag(DelLoc, diag::err_deleted_decl_not_first); 8766 Diag(Prev->getLocation(), diag::note_previous_declaration); 8767 // If the declaration wasn't the first, we delete the function anyway for 8768 // recovery. 8769 } 8770 Fn->setDeletedAsWritten(); 8771} 8772 8773void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8774 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8775 8776 if (MD) { 8777 if (MD->getParent()->isDependentType()) { 8778 MD->setDefaulted(); 8779 MD->setExplicitlyDefaulted(); 8780 return; 8781 } 8782 8783 CXXSpecialMember Member = getSpecialMember(MD); 8784 if (Member == CXXInvalid) { 8785 Diag(DefaultLoc, diag::err_default_special_members); 8786 return; 8787 } 8788 8789 MD->setDefaulted(); 8790 MD->setExplicitlyDefaulted(); 8791 8792 // If this definition appears within the record, do the checking when 8793 // the record is complete. 8794 const FunctionDecl *Primary = MD; 8795 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8796 // Find the uninstantiated declaration that actually had the '= default' 8797 // on it. 8798 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8799 8800 if (Primary == Primary->getCanonicalDecl()) 8801 return; 8802 8803 switch (Member) { 8804 case CXXDefaultConstructor: { 8805 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8806 CheckExplicitlyDefaultedDefaultConstructor(CD); 8807 if (!CD->isInvalidDecl()) 8808 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8809 break; 8810 } 8811 8812 case CXXCopyConstructor: { 8813 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8814 CheckExplicitlyDefaultedCopyConstructor(CD); 8815 if (!CD->isInvalidDecl()) 8816 DefineImplicitCopyConstructor(DefaultLoc, CD); 8817 break; 8818 } 8819 8820 case CXXCopyAssignment: { 8821 CheckExplicitlyDefaultedCopyAssignment(MD); 8822 if (!MD->isInvalidDecl()) 8823 DefineImplicitCopyAssignment(DefaultLoc, MD); 8824 break; 8825 } 8826 8827 case CXXDestructor: { 8828 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8829 CheckExplicitlyDefaultedDestructor(DD); 8830 if (!DD->isInvalidDecl()) 8831 DefineImplicitDestructor(DefaultLoc, DD); 8832 break; 8833 } 8834 8835 case CXXMoveConstructor: 8836 case CXXMoveAssignment: 8837 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8838 break; 8839 8840 default: 8841 // FIXME: Do the rest once we have move functions 8842 break; 8843 } 8844 } else { 8845 Diag(DefaultLoc, diag::err_default_special_members); 8846 } 8847} 8848 8849static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8850 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8851 Stmt *SubStmt = *CI; 8852 if (!SubStmt) 8853 continue; 8854 if (isa<ReturnStmt>(SubStmt)) 8855 Self.Diag(SubStmt->getSourceRange().getBegin(), 8856 diag::err_return_in_constructor_handler); 8857 if (!isa<Expr>(SubStmt)) 8858 SearchForReturnInStmt(Self, SubStmt); 8859 } 8860} 8861 8862void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8863 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8864 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8865 SearchForReturnInStmt(*this, Handler); 8866 } 8867} 8868 8869bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8870 const CXXMethodDecl *Old) { 8871 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8872 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8873 8874 if (Context.hasSameType(NewTy, OldTy) || 8875 NewTy->isDependentType() || OldTy->isDependentType()) 8876 return false; 8877 8878 // Check if the return types are covariant 8879 QualType NewClassTy, OldClassTy; 8880 8881 /// Both types must be pointers or references to classes. 8882 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8883 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8884 NewClassTy = NewPT->getPointeeType(); 8885 OldClassTy = OldPT->getPointeeType(); 8886 } 8887 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8888 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8889 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8890 NewClassTy = NewRT->getPointeeType(); 8891 OldClassTy = OldRT->getPointeeType(); 8892 } 8893 } 8894 } 8895 8896 // The return types aren't either both pointers or references to a class type. 8897 if (NewClassTy.isNull()) { 8898 Diag(New->getLocation(), 8899 diag::err_different_return_type_for_overriding_virtual_function) 8900 << New->getDeclName() << NewTy << OldTy; 8901 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8902 8903 return true; 8904 } 8905 8906 // C++ [class.virtual]p6: 8907 // If the return type of D::f differs from the return type of B::f, the 8908 // class type in the return type of D::f shall be complete at the point of 8909 // declaration of D::f or shall be the class type D. 8910 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8911 if (!RT->isBeingDefined() && 8912 RequireCompleteType(New->getLocation(), NewClassTy, 8913 PDiag(diag::err_covariant_return_incomplete) 8914 << New->getDeclName())) 8915 return true; 8916 } 8917 8918 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8919 // Check if the new class derives from the old class. 8920 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8921 Diag(New->getLocation(), 8922 diag::err_covariant_return_not_derived) 8923 << New->getDeclName() << NewTy << OldTy; 8924 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8925 return true; 8926 } 8927 8928 // Check if we the conversion from derived to base is valid. 8929 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8930 diag::err_covariant_return_inaccessible_base, 8931 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8932 // FIXME: Should this point to the return type? 8933 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8934 // FIXME: this note won't trigger for delayed access control 8935 // diagnostics, and it's impossible to get an undelayed error 8936 // here from access control during the original parse because 8937 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8938 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8939 return true; 8940 } 8941 } 8942 8943 // The qualifiers of the return types must be the same. 8944 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8945 Diag(New->getLocation(), 8946 diag::err_covariant_return_type_different_qualifications) 8947 << New->getDeclName() << NewTy << OldTy; 8948 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8949 return true; 8950 }; 8951 8952 8953 // The new class type must have the same or less qualifiers as the old type. 8954 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8955 Diag(New->getLocation(), 8956 diag::err_covariant_return_type_class_type_more_qualified) 8957 << New->getDeclName() << NewTy << OldTy; 8958 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8959 return true; 8960 }; 8961 8962 return false; 8963} 8964 8965/// \brief Mark the given method pure. 8966/// 8967/// \param Method the method to be marked pure. 8968/// 8969/// \param InitRange the source range that covers the "0" initializer. 8970bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8971 SourceLocation EndLoc = InitRange.getEnd(); 8972 if (EndLoc.isValid()) 8973 Method->setRangeEnd(EndLoc); 8974 8975 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8976 Method->setPure(); 8977 return false; 8978 } 8979 8980 if (!Method->isInvalidDecl()) 8981 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8982 << Method->getDeclName() << InitRange; 8983 return true; 8984} 8985 8986/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8987/// an initializer for the out-of-line declaration 'Dcl'. The scope 8988/// is a fresh scope pushed for just this purpose. 8989/// 8990/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8991/// static data member of class X, names should be looked up in the scope of 8992/// class X. 8993void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8994 // If there is no declaration, there was an error parsing it. 8995 if (D == 0 || D->isInvalidDecl()) return; 8996 8997 // We should only get called for declarations with scope specifiers, like: 8998 // int foo::bar; 8999 assert(D->isOutOfLine()); 9000 EnterDeclaratorContext(S, D->getDeclContext()); 9001} 9002 9003/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 9004/// initializer for the out-of-line declaration 'D'. 9005void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 9006 // If there is no declaration, there was an error parsing it. 9007 if (D == 0 || D->isInvalidDecl()) return; 9008 9009 assert(D->isOutOfLine()); 9010 ExitDeclaratorContext(S); 9011} 9012 9013/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 9014/// C++ if/switch/while/for statement. 9015/// e.g: "if (int x = f()) {...}" 9016DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 9017 // C++ 6.4p2: 9018 // The declarator shall not specify a function or an array. 9019 // The type-specifier-seq shall not contain typedef and shall not declare a 9020 // new class or enumeration. 9021 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 9022 "Parser allowed 'typedef' as storage class of condition decl."); 9023 9024 TagDecl *OwnedTag = 0; 9025 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 9026 QualType Ty = TInfo->getType(); 9027 9028 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 9029 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 9030 // would be created and CXXConditionDeclExpr wants a VarDecl. 9031 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 9032 << D.getSourceRange(); 9033 return DeclResult(); 9034 } else if (OwnedTag && OwnedTag->isDefinition()) { 9035 // The type-specifier-seq shall not declare a new class or enumeration. 9036 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 9037 } 9038 9039 Decl *Dcl = ActOnDeclarator(S, D); 9040 if (!Dcl) 9041 return DeclResult(); 9042 9043 return Dcl; 9044} 9045 9046void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 9047 bool DefinitionRequired) { 9048 // Ignore any vtable uses in unevaluated operands or for classes that do 9049 // not have a vtable. 9050 if (!Class->isDynamicClass() || Class->isDependentContext() || 9051 CurContext->isDependentContext() || 9052 ExprEvalContexts.back().Context == Unevaluated) 9053 return; 9054 9055 // Try to insert this class into the map. 9056 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9057 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 9058 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 9059 if (!Pos.second) { 9060 // If we already had an entry, check to see if we are promoting this vtable 9061 // to required a definition. If so, we need to reappend to the VTableUses 9062 // list, since we may have already processed the first entry. 9063 if (DefinitionRequired && !Pos.first->second) { 9064 Pos.first->second = true; 9065 } else { 9066 // Otherwise, we can early exit. 9067 return; 9068 } 9069 } 9070 9071 // Local classes need to have their virtual members marked 9072 // immediately. For all other classes, we mark their virtual members 9073 // at the end of the translation unit. 9074 if (Class->isLocalClass()) 9075 MarkVirtualMembersReferenced(Loc, Class); 9076 else 9077 VTableUses.push_back(std::make_pair(Class, Loc)); 9078} 9079 9080bool Sema::DefineUsedVTables() { 9081 if (VTableUses.empty()) 9082 return false; 9083 9084 // Note: The VTableUses vector could grow as a result of marking 9085 // the members of a class as "used", so we check the size each 9086 // time through the loop and prefer indices (with are stable) to 9087 // iterators (which are not). 9088 bool DefinedAnything = false; 9089 for (unsigned I = 0; I != VTableUses.size(); ++I) { 9090 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 9091 if (!Class) 9092 continue; 9093 9094 SourceLocation Loc = VTableUses[I].second; 9095 9096 // If this class has a key function, but that key function is 9097 // defined in another translation unit, we don't need to emit the 9098 // vtable even though we're using it. 9099 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 9100 if (KeyFunction && !KeyFunction->hasBody()) { 9101 switch (KeyFunction->getTemplateSpecializationKind()) { 9102 case TSK_Undeclared: 9103 case TSK_ExplicitSpecialization: 9104 case TSK_ExplicitInstantiationDeclaration: 9105 // The key function is in another translation unit. 9106 continue; 9107 9108 case TSK_ExplicitInstantiationDefinition: 9109 case TSK_ImplicitInstantiation: 9110 // We will be instantiating the key function. 9111 break; 9112 } 9113 } else if (!KeyFunction) { 9114 // If we have a class with no key function that is the subject 9115 // of an explicit instantiation declaration, suppress the 9116 // vtable; it will live with the explicit instantiation 9117 // definition. 9118 bool IsExplicitInstantiationDeclaration 9119 = Class->getTemplateSpecializationKind() 9120 == TSK_ExplicitInstantiationDeclaration; 9121 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9122 REnd = Class->redecls_end(); 9123 R != REnd; ++R) { 9124 TemplateSpecializationKind TSK 9125 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9126 if (TSK == TSK_ExplicitInstantiationDeclaration) 9127 IsExplicitInstantiationDeclaration = true; 9128 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9129 IsExplicitInstantiationDeclaration = false; 9130 break; 9131 } 9132 } 9133 9134 if (IsExplicitInstantiationDeclaration) 9135 continue; 9136 } 9137 9138 // Mark all of the virtual members of this class as referenced, so 9139 // that we can build a vtable. Then, tell the AST consumer that a 9140 // vtable for this class is required. 9141 DefinedAnything = true; 9142 MarkVirtualMembersReferenced(Loc, Class); 9143 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9144 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9145 9146 // Optionally warn if we're emitting a weak vtable. 9147 if (Class->getLinkage() == ExternalLinkage && 9148 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9149 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9150 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9151 } 9152 } 9153 VTableUses.clear(); 9154 9155 return DefinedAnything; 9156} 9157 9158void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9159 const CXXRecordDecl *RD) { 9160 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9161 e = RD->method_end(); i != e; ++i) { 9162 CXXMethodDecl *MD = *i; 9163 9164 // C++ [basic.def.odr]p2: 9165 // [...] A virtual member function is used if it is not pure. [...] 9166 if (MD->isVirtual() && !MD->isPure()) 9167 MarkDeclarationReferenced(Loc, MD); 9168 } 9169 9170 // Only classes that have virtual bases need a VTT. 9171 if (RD->getNumVBases() == 0) 9172 return; 9173 9174 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9175 e = RD->bases_end(); i != e; ++i) { 9176 const CXXRecordDecl *Base = 9177 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9178 if (Base->getNumVBases() == 0) 9179 continue; 9180 MarkVirtualMembersReferenced(Loc, Base); 9181 } 9182} 9183 9184/// SetIvarInitializers - This routine builds initialization ASTs for the 9185/// Objective-C implementation whose ivars need be initialized. 9186void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9187 if (!getLangOptions().CPlusPlus) 9188 return; 9189 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9190 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9191 CollectIvarsToConstructOrDestruct(OID, ivars); 9192 if (ivars.empty()) 9193 return; 9194 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9195 for (unsigned i = 0; i < ivars.size(); i++) { 9196 FieldDecl *Field = ivars[i]; 9197 if (Field->isInvalidDecl()) 9198 continue; 9199 9200 CXXCtorInitializer *Member; 9201 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9202 InitializationKind InitKind = 9203 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9204 9205 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9206 ExprResult MemberInit = 9207 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9208 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9209 // Note, MemberInit could actually come back empty if no initialization 9210 // is required (e.g., because it would call a trivial default constructor) 9211 if (!MemberInit.get() || MemberInit.isInvalid()) 9212 continue; 9213 9214 Member = 9215 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9216 SourceLocation(), 9217 MemberInit.takeAs<Expr>(), 9218 SourceLocation()); 9219 AllToInit.push_back(Member); 9220 9221 // Be sure that the destructor is accessible and is marked as referenced. 9222 if (const RecordType *RecordTy 9223 = Context.getBaseElementType(Field->getType()) 9224 ->getAs<RecordType>()) { 9225 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9226 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9227 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9228 CheckDestructorAccess(Field->getLocation(), Destructor, 9229 PDiag(diag::err_access_dtor_ivar) 9230 << Context.getBaseElementType(Field->getType())); 9231 } 9232 } 9233 } 9234 ObjCImplementation->setIvarInitializers(Context, 9235 AllToInit.data(), AllToInit.size()); 9236 } 9237} 9238 9239static 9240void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9241 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9242 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9243 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9244 Sema &S) { 9245 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9246 CE = Current.end(); 9247 if (Ctor->isInvalidDecl()) 9248 return; 9249 9250 const FunctionDecl *FNTarget = 0; 9251 CXXConstructorDecl *Target; 9252 9253 // We ignore the result here since if we don't have a body, Target will be 9254 // null below. 9255 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9256 Target 9257= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9258 9259 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9260 // Avoid dereferencing a null pointer here. 9261 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9262 9263 if (!Current.insert(Canonical)) 9264 return; 9265 9266 // We know that beyond here, we aren't chaining into a cycle. 9267 if (!Target || !Target->isDelegatingConstructor() || 9268 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9269 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9270 Valid.insert(*CI); 9271 Current.clear(); 9272 // We've hit a cycle. 9273 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9274 Current.count(TCanonical)) { 9275 // If we haven't diagnosed this cycle yet, do so now. 9276 if (!Invalid.count(TCanonical)) { 9277 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9278 diag::warn_delegating_ctor_cycle) 9279 << Ctor; 9280 9281 // Don't add a note for a function delegating directo to itself. 9282 if (TCanonical != Canonical) 9283 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9284 9285 CXXConstructorDecl *C = Target; 9286 while (C->getCanonicalDecl() != Canonical) { 9287 (void)C->getTargetConstructor()->hasBody(FNTarget); 9288 assert(FNTarget && "Ctor cycle through bodiless function"); 9289 9290 C 9291 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9292 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9293 } 9294 } 9295 9296 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9297 Invalid.insert(*CI); 9298 Current.clear(); 9299 } else { 9300 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9301 } 9302} 9303 9304 9305void Sema::CheckDelegatingCtorCycles() { 9306 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9307 9308 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9309 CE = Current.end(); 9310 9311 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9312 I = DelegatingCtorDecls.begin(), 9313 E = DelegatingCtorDecls.end(); 9314 I != E; ++I) { 9315 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9316 } 9317 9318 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9319 (*CI)->setInvalidDecl(); 9320} 9321