SemaDeclCXX.cpp revision 9aca87d4b48058d56a48d62435ad6a871cc62ad1
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 Expr *BW, const VirtSpecifiers &VS, 1064 Expr *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = D.isDeclarationOfFunction(); 1083 1084 // C++ 9.2p6: A member shall not be declared to have automatic storage 1085 // duration (auto, register) or with the extern storage-class-specifier. 1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1087 // data members and cannot be applied to names declared const or static, 1088 // and cannot be applied to reference members. 1089 switch (DS.getStorageClassSpec()) { 1090 case DeclSpec::SCS_unspecified: 1091 case DeclSpec::SCS_typedef: 1092 case DeclSpec::SCS_static: 1093 // FALL THROUGH. 1094 break; 1095 case DeclSpec::SCS_mutable: 1096 if (isFunc) { 1097 if (DS.getStorageClassSpecLoc().isValid()) 1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1099 else 1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1101 1102 // FIXME: It would be nicer if the keyword was ignored only for this 1103 // declarator. Otherwise we could get follow-up errors. 1104 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1105 } 1106 break; 1107 default: 1108 if (DS.getStorageClassSpecLoc().isValid()) 1109 Diag(DS.getStorageClassSpecLoc(), 1110 diag::err_storageclass_invalid_for_member); 1111 else 1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1113 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1114 } 1115 1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1118 !isFunc); 1119 1120 Decl *Member; 1121 if (isInstField) { 1122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1123 1124 if (SS.isSet() && !SS.isInvalid()) { 1125 // The user provided a superfluous scope specifier inside a class 1126 // definition: 1127 // 1128 // class X { 1129 // int X::member; 1130 // }; 1131 DeclContext *DC = 0; 1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1134 << Name << FixItHint::CreateRemoval(SS.getRange()); 1135 else 1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1137 << Name << SS.getRange(); 1138 1139 SS.clear(); 1140 } 1141 1142 // FIXME: Check for template parameters! 1143 // FIXME: Check that the name is an identifier! 1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1145 HasDeferredInit, AS); 1146 assert(Member && "HandleField never returns null"); 1147 } else { 1148 assert(!HasDeferredInit); 1149 1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1151 if (!Member) { 1152 return 0; 1153 } 1154 1155 // Non-instance-fields can't have a bitfield. 1156 if (BitWidth) { 1157 if (Member->isInvalidDecl()) { 1158 // don't emit another diagnostic. 1159 } else if (isa<VarDecl>(Member)) { 1160 // C++ 9.6p3: A bit-field shall not be a static member. 1161 // "static member 'A' cannot be a bit-field" 1162 Diag(Loc, diag::err_static_not_bitfield) 1163 << Name << BitWidth->getSourceRange(); 1164 } else if (isa<TypedefDecl>(Member)) { 1165 // "typedef member 'x' cannot be a bit-field" 1166 Diag(Loc, diag::err_typedef_not_bitfield) 1167 << Name << BitWidth->getSourceRange(); 1168 } else { 1169 // A function typedef ("typedef int f(); f a;"). 1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1171 Diag(Loc, diag::err_not_integral_type_bitfield) 1172 << Name << cast<ValueDecl>(Member)->getType() 1173 << BitWidth->getSourceRange(); 1174 } 1175 1176 BitWidth = 0; 1177 Member->setInvalidDecl(); 1178 } 1179 1180 Member->setAccess(AS); 1181 1182 // If we have declared a member function template, set the access of the 1183 // templated declaration as well. 1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1185 FunTmpl->getTemplatedDecl()->setAccess(AS); 1186 } 1187 1188 if (VS.isOverrideSpecified()) { 1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1190 if (!MD || !MD->isVirtual()) { 1191 Diag(Member->getLocStart(), 1192 diag::override_keyword_only_allowed_on_virtual_member_functions) 1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1194 } else 1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1196 } 1197 if (VS.isFinalSpecified()) { 1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1199 if (!MD || !MD->isVirtual()) { 1200 Diag(Member->getLocStart(), 1201 diag::override_keyword_only_allowed_on_virtual_member_functions) 1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1203 } else 1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1205 } 1206 1207 if (VS.getLastLocation().isValid()) { 1208 // Update the end location of a method that has a virt-specifiers. 1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1210 MD->setRangeEnd(VS.getLastLocation()); 1211 } 1212 1213 CheckOverrideControl(Member); 1214 1215 assert((Name || isInstField) && "No identifier for non-field ?"); 1216 1217 if (Init) 1218 AddInitializerToDecl(Member, Init, false, 1219 DS.getTypeSpecType() == DeclSpec::TST_auto); 1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1223 // data member if a brace-or-equal-initializer is provided. 1224 Diag(Loc, diag::err_auto_var_requires_init) 1225 << Name << cast<ValueDecl>(Member)->getType(); 1226 Member->setInvalidDecl(); 1227 } 1228 1229 FinalizeDeclaration(Member); 1230 1231 if (isInstField) 1232 FieldCollector->Add(cast<FieldDecl>(Member)); 1233 return Member; 1234} 1235 1236/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1237/// in-class initializer for a non-static C++ class member, and after 1238/// instantiating an in-class initializer in a class template. Such actions 1239/// are deferred until the class is complete. 1240void 1241Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1242 Expr *InitExpr) { 1243 FieldDecl *FD = cast<FieldDecl>(D); 1244 1245 if (!InitExpr) { 1246 FD->setInvalidDecl(); 1247 FD->removeInClassInitializer(); 1248 return; 1249 } 1250 1251 ExprResult Init = InitExpr; 1252 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1253 // FIXME: if there is no EqualLoc, this is list-initialization. 1254 Init = PerformCopyInitialization( 1255 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1256 if (Init.isInvalid()) { 1257 FD->setInvalidDecl(); 1258 return; 1259 } 1260 1261 CheckImplicitConversions(Init.get(), EqualLoc); 1262 } 1263 1264 // C++0x [class.base.init]p7: 1265 // The initialization of each base and member constitutes a 1266 // full-expression. 1267 Init = MaybeCreateExprWithCleanups(Init); 1268 if (Init.isInvalid()) { 1269 FD->setInvalidDecl(); 1270 return; 1271 } 1272 1273 InitExpr = Init.release(); 1274 1275 FD->setInClassInitializer(InitExpr); 1276} 1277 1278/// \brief Find the direct and/or virtual base specifiers that 1279/// correspond to the given base type, for use in base initialization 1280/// within a constructor. 1281static bool FindBaseInitializer(Sema &SemaRef, 1282 CXXRecordDecl *ClassDecl, 1283 QualType BaseType, 1284 const CXXBaseSpecifier *&DirectBaseSpec, 1285 const CXXBaseSpecifier *&VirtualBaseSpec) { 1286 // First, check for a direct base class. 1287 DirectBaseSpec = 0; 1288 for (CXXRecordDecl::base_class_const_iterator Base 1289 = ClassDecl->bases_begin(); 1290 Base != ClassDecl->bases_end(); ++Base) { 1291 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1292 // We found a direct base of this type. That's what we're 1293 // initializing. 1294 DirectBaseSpec = &*Base; 1295 break; 1296 } 1297 } 1298 1299 // Check for a virtual base class. 1300 // FIXME: We might be able to short-circuit this if we know in advance that 1301 // there are no virtual bases. 1302 VirtualBaseSpec = 0; 1303 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1304 // We haven't found a base yet; search the class hierarchy for a 1305 // virtual base class. 1306 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1307 /*DetectVirtual=*/false); 1308 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1309 BaseType, Paths)) { 1310 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1311 Path != Paths.end(); ++Path) { 1312 if (Path->back().Base->isVirtual()) { 1313 VirtualBaseSpec = Path->back().Base; 1314 break; 1315 } 1316 } 1317 } 1318 } 1319 1320 return DirectBaseSpec || VirtualBaseSpec; 1321} 1322 1323/// ActOnMemInitializer - Handle a C++ member initializer. 1324MemInitResult 1325Sema::ActOnMemInitializer(Decl *ConstructorD, 1326 Scope *S, 1327 CXXScopeSpec &SS, 1328 IdentifierInfo *MemberOrBase, 1329 ParsedType TemplateTypeTy, 1330 SourceLocation IdLoc, 1331 SourceLocation LParenLoc, 1332 Expr **Args, unsigned NumArgs, 1333 SourceLocation RParenLoc, 1334 SourceLocation EllipsisLoc) { 1335 if (!ConstructorD) 1336 return true; 1337 1338 AdjustDeclIfTemplate(ConstructorD); 1339 1340 CXXConstructorDecl *Constructor 1341 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1342 if (!Constructor) { 1343 // The user wrote a constructor initializer on a function that is 1344 // not a C++ constructor. Ignore the error for now, because we may 1345 // have more member initializers coming; we'll diagnose it just 1346 // once in ActOnMemInitializers. 1347 return true; 1348 } 1349 1350 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1351 1352 // C++ [class.base.init]p2: 1353 // Names in a mem-initializer-id are looked up in the scope of the 1354 // constructor's class and, if not found in that scope, are looked 1355 // up in the scope containing the constructor's definition. 1356 // [Note: if the constructor's class contains a member with the 1357 // same name as a direct or virtual base class of the class, a 1358 // mem-initializer-id naming the member or base class and composed 1359 // of a single identifier refers to the class member. A 1360 // mem-initializer-id for the hidden base class may be specified 1361 // using a qualified name. ] 1362 if (!SS.getScopeRep() && !TemplateTypeTy) { 1363 // Look for a member, first. 1364 FieldDecl *Member = 0; 1365 DeclContext::lookup_result Result 1366 = ClassDecl->lookup(MemberOrBase); 1367 if (Result.first != Result.second) { 1368 Member = dyn_cast<FieldDecl>(*Result.first); 1369 1370 if (Member) { 1371 if (EllipsisLoc.isValid()) 1372 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1373 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1374 1375 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1376 LParenLoc, RParenLoc); 1377 } 1378 1379 // Handle anonymous union case. 1380 if (IndirectFieldDecl* IndirectField 1381 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1382 if (EllipsisLoc.isValid()) 1383 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1384 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1385 1386 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1387 NumArgs, IdLoc, 1388 LParenLoc, RParenLoc); 1389 } 1390 } 1391 } 1392 // It didn't name a member, so see if it names a class. 1393 QualType BaseType; 1394 TypeSourceInfo *TInfo = 0; 1395 1396 if (TemplateTypeTy) { 1397 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1398 } else { 1399 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1400 LookupParsedName(R, S, &SS); 1401 1402 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1403 if (!TyD) { 1404 if (R.isAmbiguous()) return true; 1405 1406 // We don't want access-control diagnostics here. 1407 R.suppressDiagnostics(); 1408 1409 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1410 bool NotUnknownSpecialization = false; 1411 DeclContext *DC = computeDeclContext(SS, false); 1412 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1413 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1414 1415 if (!NotUnknownSpecialization) { 1416 // When the scope specifier can refer to a member of an unknown 1417 // specialization, we take it as a type name. 1418 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1419 SS.getWithLocInContext(Context), 1420 *MemberOrBase, IdLoc); 1421 if (BaseType.isNull()) 1422 return true; 1423 1424 R.clear(); 1425 R.setLookupName(MemberOrBase); 1426 } 1427 } 1428 1429 // If no results were found, try to correct typos. 1430 TypoCorrection Corr; 1431 if (R.empty() && BaseType.isNull() && 1432 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1433 ClassDecl, false, CTC_NoKeywords))) { 1434 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1435 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1436 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1437 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1438 // We have found a non-static data member with a similar 1439 // name to what was typed; complain and initialize that 1440 // member. 1441 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1442 << MemberOrBase << true << CorrectedQuotedStr 1443 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1444 Diag(Member->getLocation(), diag::note_previous_decl) 1445 << CorrectedQuotedStr; 1446 1447 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1448 LParenLoc, RParenLoc); 1449 } 1450 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1451 const CXXBaseSpecifier *DirectBaseSpec; 1452 const CXXBaseSpecifier *VirtualBaseSpec; 1453 if (FindBaseInitializer(*this, ClassDecl, 1454 Context.getTypeDeclType(Type), 1455 DirectBaseSpec, VirtualBaseSpec)) { 1456 // We have found a direct or virtual base class with a 1457 // similar name to what was typed; complain and initialize 1458 // that base class. 1459 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1460 << MemberOrBase << false << CorrectedQuotedStr 1461 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1462 1463 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1464 : VirtualBaseSpec; 1465 Diag(BaseSpec->getSourceRange().getBegin(), 1466 diag::note_base_class_specified_here) 1467 << BaseSpec->getType() 1468 << BaseSpec->getSourceRange(); 1469 1470 TyD = Type; 1471 } 1472 } 1473 } 1474 1475 if (!TyD && BaseType.isNull()) { 1476 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1477 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1478 return true; 1479 } 1480 } 1481 1482 if (BaseType.isNull()) { 1483 BaseType = Context.getTypeDeclType(TyD); 1484 if (SS.isSet()) { 1485 NestedNameSpecifier *Qualifier = 1486 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1487 1488 // FIXME: preserve source range information 1489 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1490 } 1491 } 1492 } 1493 1494 if (!TInfo) 1495 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1496 1497 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1498 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1499} 1500 1501/// Checks a member initializer expression for cases where reference (or 1502/// pointer) members are bound to by-value parameters (or their addresses). 1503static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1504 Expr *Init, 1505 SourceLocation IdLoc) { 1506 QualType MemberTy = Member->getType(); 1507 1508 // We only handle pointers and references currently. 1509 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1510 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1511 return; 1512 1513 const bool IsPointer = MemberTy->isPointerType(); 1514 if (IsPointer) { 1515 if (const UnaryOperator *Op 1516 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1517 // The only case we're worried about with pointers requires taking the 1518 // address. 1519 if (Op->getOpcode() != UO_AddrOf) 1520 return; 1521 1522 Init = Op->getSubExpr(); 1523 } else { 1524 // We only handle address-of expression initializers for pointers. 1525 return; 1526 } 1527 } 1528 1529 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1530 // Taking the address of a temporary will be diagnosed as a hard error. 1531 if (IsPointer) 1532 return; 1533 1534 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1535 << Member << Init->getSourceRange(); 1536 } else if (const DeclRefExpr *DRE 1537 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1538 // We only warn when referring to a non-reference parameter declaration. 1539 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1540 if (!Parameter || Parameter->getType()->isReferenceType()) 1541 return; 1542 1543 S.Diag(Init->getExprLoc(), 1544 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1545 : diag::warn_bind_ref_member_to_parameter) 1546 << Member << Parameter << Init->getSourceRange(); 1547 } else { 1548 // Other initializers are fine. 1549 return; 1550 } 1551 1552 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1553 << (unsigned)IsPointer; 1554} 1555 1556/// Checks an initializer expression for use of uninitialized fields, such as 1557/// containing the field that is being initialized. Returns true if there is an 1558/// uninitialized field was used an updates the SourceLocation parameter; false 1559/// otherwise. 1560static bool InitExprContainsUninitializedFields(const Stmt *S, 1561 const ValueDecl *LhsField, 1562 SourceLocation *L) { 1563 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1564 1565 if (isa<CallExpr>(S)) { 1566 // Do not descend into function calls or constructors, as the use 1567 // of an uninitialized field may be valid. One would have to inspect 1568 // the contents of the function/ctor to determine if it is safe or not. 1569 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1570 // may be safe, depending on what the function/ctor does. 1571 return false; 1572 } 1573 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1574 const NamedDecl *RhsField = ME->getMemberDecl(); 1575 1576 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1577 // The member expression points to a static data member. 1578 assert(VD->isStaticDataMember() && 1579 "Member points to non-static data member!"); 1580 (void)VD; 1581 return false; 1582 } 1583 1584 if (isa<EnumConstantDecl>(RhsField)) { 1585 // The member expression points to an enum. 1586 return false; 1587 } 1588 1589 if (RhsField == LhsField) { 1590 // Initializing a field with itself. Throw a warning. 1591 // But wait; there are exceptions! 1592 // Exception #1: The field may not belong to this record. 1593 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1594 const Expr *base = ME->getBase(); 1595 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1596 // Even though the field matches, it does not belong to this record. 1597 return false; 1598 } 1599 // None of the exceptions triggered; return true to indicate an 1600 // uninitialized field was used. 1601 *L = ME->getMemberLoc(); 1602 return true; 1603 } 1604 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1605 // sizeof/alignof doesn't reference contents, do not warn. 1606 return false; 1607 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1608 // address-of doesn't reference contents (the pointer may be dereferenced 1609 // in the same expression but it would be rare; and weird). 1610 if (UOE->getOpcode() == UO_AddrOf) 1611 return false; 1612 } 1613 for (Stmt::const_child_range it = S->children(); it; ++it) { 1614 if (!*it) { 1615 // An expression such as 'member(arg ?: "")' may trigger this. 1616 continue; 1617 } 1618 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1619 return true; 1620 } 1621 return false; 1622} 1623 1624MemInitResult 1625Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1626 unsigned NumArgs, SourceLocation IdLoc, 1627 SourceLocation LParenLoc, 1628 SourceLocation RParenLoc) { 1629 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1630 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1631 assert((DirectMember || IndirectMember) && 1632 "Member must be a FieldDecl or IndirectFieldDecl"); 1633 1634 if (Member->isInvalidDecl()) 1635 return true; 1636 1637 // Diagnose value-uses of fields to initialize themselves, e.g. 1638 // foo(foo) 1639 // where foo is not also a parameter to the constructor. 1640 // TODO: implement -Wuninitialized and fold this into that framework. 1641 for (unsigned i = 0; i < NumArgs; ++i) { 1642 SourceLocation L; 1643 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1644 // FIXME: Return true in the case when other fields are used before being 1645 // uninitialized. For example, let this field be the i'th field. When 1646 // initializing the i'th field, throw a warning if any of the >= i'th 1647 // fields are used, as they are not yet initialized. 1648 // Right now we are only handling the case where the i'th field uses 1649 // itself in its initializer. 1650 Diag(L, diag::warn_field_is_uninit); 1651 } 1652 } 1653 1654 bool HasDependentArg = false; 1655 for (unsigned i = 0; i < NumArgs; i++) 1656 HasDependentArg |= Args[i]->isTypeDependent(); 1657 1658 Expr *Init; 1659 if (Member->getType()->isDependentType() || HasDependentArg) { 1660 // Can't check initialization for a member of dependent type or when 1661 // any of the arguments are type-dependent expressions. 1662 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1663 RParenLoc, 1664 Member->getType().getNonReferenceType()); 1665 1666 DiscardCleanupsInEvaluationContext(); 1667 } else { 1668 // Initialize the member. 1669 InitializedEntity MemberEntity = 1670 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1671 : InitializedEntity::InitializeMember(IndirectMember, 0); 1672 InitializationKind Kind = 1673 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1674 1675 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1676 1677 ExprResult MemberInit = 1678 InitSeq.Perform(*this, MemberEntity, Kind, 1679 MultiExprArg(*this, Args, NumArgs), 0); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1684 1685 // C++0x [class.base.init]p7: 1686 // The initialization of each base and member constitutes a 1687 // full-expression. 1688 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1689 if (MemberInit.isInvalid()) 1690 return true; 1691 1692 // If we are in a dependent context, template instantiation will 1693 // perform this type-checking again. Just save the arguments that we 1694 // received in a ParenListExpr. 1695 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1696 // of the information that we have about the member 1697 // initializer. However, deconstructing the ASTs is a dicey process, 1698 // and this approach is far more likely to get the corner cases right. 1699 if (CurContext->isDependentContext()) { 1700 Init = new (Context) ParenListExpr( 1701 Context, LParenLoc, Args, NumArgs, RParenLoc, 1702 Member->getType().getNonReferenceType()); 1703 } else { 1704 Init = MemberInit.get(); 1705 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 1706 } 1707 } 1708 1709 if (DirectMember) { 1710 return new (Context) CXXCtorInitializer(Context, DirectMember, 1711 IdLoc, LParenLoc, Init, 1712 RParenLoc); 1713 } else { 1714 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1715 IdLoc, LParenLoc, Init, 1716 RParenLoc); 1717 } 1718} 1719 1720MemInitResult 1721Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1722 Expr **Args, unsigned NumArgs, 1723 SourceLocation NameLoc, 1724 SourceLocation LParenLoc, 1725 SourceLocation RParenLoc, 1726 CXXRecordDecl *ClassDecl) { 1727 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1728 if (!LangOpts.CPlusPlus0x) 1729 return Diag(Loc, diag::err_delegation_0x_only) 1730 << TInfo->getTypeLoc().getLocalSourceRange(); 1731 1732 // Initialize the object. 1733 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1734 QualType(ClassDecl->getTypeForDecl(), 0)); 1735 InitializationKind Kind = 1736 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1737 1738 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1739 1740 ExprResult DelegationInit = 1741 InitSeq.Perform(*this, DelegationEntity, Kind, 1742 MultiExprArg(*this, Args, NumArgs), 0); 1743 if (DelegationInit.isInvalid()) 1744 return true; 1745 1746 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1747 CXXConstructorDecl *Constructor 1748 = ConExpr->getConstructor(); 1749 assert(Constructor && "Delegating constructor with no target?"); 1750 1751 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1752 1753 // C++0x [class.base.init]p7: 1754 // The initialization of each base and member constitutes a 1755 // full-expression. 1756 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1757 if (DelegationInit.isInvalid()) 1758 return true; 1759 1760 assert(!CurContext->isDependentContext()); 1761 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1762 DelegationInit.takeAs<Expr>(), 1763 RParenLoc); 1764} 1765 1766MemInitResult 1767Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1768 Expr **Args, unsigned NumArgs, 1769 SourceLocation LParenLoc, SourceLocation RParenLoc, 1770 CXXRecordDecl *ClassDecl, 1771 SourceLocation EllipsisLoc) { 1772 bool HasDependentArg = false; 1773 for (unsigned i = 0; i < NumArgs; i++) 1774 HasDependentArg |= Args[i]->isTypeDependent(); 1775 1776 SourceLocation BaseLoc 1777 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1778 1779 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1780 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1781 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1782 1783 // C++ [class.base.init]p2: 1784 // [...] Unless the mem-initializer-id names a nonstatic data 1785 // member of the constructor's class or a direct or virtual base 1786 // of that class, the mem-initializer is ill-formed. A 1787 // mem-initializer-list can initialize a base class using any 1788 // name that denotes that base class type. 1789 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1790 1791 if (EllipsisLoc.isValid()) { 1792 // This is a pack expansion. 1793 if (!BaseType->containsUnexpandedParameterPack()) { 1794 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1795 << SourceRange(BaseLoc, RParenLoc); 1796 1797 EllipsisLoc = SourceLocation(); 1798 } 1799 } else { 1800 // Check for any unexpanded parameter packs. 1801 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1802 return true; 1803 1804 for (unsigned I = 0; I != NumArgs; ++I) 1805 if (DiagnoseUnexpandedParameterPack(Args[I])) 1806 return true; 1807 } 1808 1809 // Check for direct and virtual base classes. 1810 const CXXBaseSpecifier *DirectBaseSpec = 0; 1811 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1812 if (!Dependent) { 1813 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1814 BaseType)) 1815 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1816 LParenLoc, RParenLoc, ClassDecl); 1817 1818 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1819 VirtualBaseSpec); 1820 1821 // C++ [base.class.init]p2: 1822 // Unless the mem-initializer-id names a nonstatic data member of the 1823 // constructor's class or a direct or virtual base of that class, the 1824 // mem-initializer is ill-formed. 1825 if (!DirectBaseSpec && !VirtualBaseSpec) { 1826 // If the class has any dependent bases, then it's possible that 1827 // one of those types will resolve to the same type as 1828 // BaseType. Therefore, just treat this as a dependent base 1829 // class initialization. FIXME: Should we try to check the 1830 // initialization anyway? It seems odd. 1831 if (ClassDecl->hasAnyDependentBases()) 1832 Dependent = true; 1833 else 1834 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1835 << BaseType << Context.getTypeDeclType(ClassDecl) 1836 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1837 } 1838 } 1839 1840 if (Dependent) { 1841 // Can't check initialization for a base of dependent type or when 1842 // any of the arguments are type-dependent expressions. 1843 ExprResult BaseInit 1844 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1845 RParenLoc, BaseType)); 1846 1847 DiscardCleanupsInEvaluationContext(); 1848 1849 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1850 /*IsVirtual=*/false, 1851 LParenLoc, 1852 BaseInit.takeAs<Expr>(), 1853 RParenLoc, 1854 EllipsisLoc); 1855 } 1856 1857 // C++ [base.class.init]p2: 1858 // If a mem-initializer-id is ambiguous because it designates both 1859 // a direct non-virtual base class and an inherited virtual base 1860 // class, the mem-initializer is ill-formed. 1861 if (DirectBaseSpec && VirtualBaseSpec) 1862 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1863 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1864 1865 CXXBaseSpecifier *BaseSpec 1866 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1867 if (!BaseSpec) 1868 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1869 1870 // Initialize the base. 1871 InitializedEntity BaseEntity = 1872 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1873 InitializationKind Kind = 1874 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1875 1876 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1877 1878 ExprResult BaseInit = 1879 InitSeq.Perform(*this, BaseEntity, Kind, 1880 MultiExprArg(*this, Args, NumArgs), 0); 1881 if (BaseInit.isInvalid()) 1882 return true; 1883 1884 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1885 1886 // C++0x [class.base.init]p7: 1887 // The initialization of each base and member constitutes a 1888 // full-expression. 1889 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1890 if (BaseInit.isInvalid()) 1891 return true; 1892 1893 // If we are in a dependent context, template instantiation will 1894 // perform this type-checking again. Just save the arguments that we 1895 // received in a ParenListExpr. 1896 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1897 // of the information that we have about the base 1898 // initializer. However, deconstructing the ASTs is a dicey process, 1899 // and this approach is far more likely to get the corner cases right. 1900 if (CurContext->isDependentContext()) { 1901 ExprResult Init 1902 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1903 RParenLoc, BaseType)); 1904 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1905 BaseSpec->isVirtual(), 1906 LParenLoc, 1907 Init.takeAs<Expr>(), 1908 RParenLoc, 1909 EllipsisLoc); 1910 } 1911 1912 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1913 BaseSpec->isVirtual(), 1914 LParenLoc, 1915 BaseInit.takeAs<Expr>(), 1916 RParenLoc, 1917 EllipsisLoc); 1918} 1919 1920// Create a static_cast\<T&&>(expr). 1921static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 1922 QualType ExprType = E->getType(); 1923 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 1924 SourceLocation ExprLoc = E->getLocStart(); 1925 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 1926 TargetType, ExprLoc); 1927 1928 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 1929 SourceRange(ExprLoc, ExprLoc), 1930 E->getSourceRange()).take(); 1931} 1932 1933/// ImplicitInitializerKind - How an implicit base or member initializer should 1934/// initialize its base or member. 1935enum ImplicitInitializerKind { 1936 IIK_Default, 1937 IIK_Copy, 1938 IIK_Move 1939}; 1940 1941static bool 1942BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1943 ImplicitInitializerKind ImplicitInitKind, 1944 CXXBaseSpecifier *BaseSpec, 1945 bool IsInheritedVirtualBase, 1946 CXXCtorInitializer *&CXXBaseInit) { 1947 InitializedEntity InitEntity 1948 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1949 IsInheritedVirtualBase); 1950 1951 ExprResult BaseInit; 1952 1953 switch (ImplicitInitKind) { 1954 case IIK_Default: { 1955 InitializationKind InitKind 1956 = InitializationKind::CreateDefault(Constructor->getLocation()); 1957 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1958 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1959 MultiExprArg(SemaRef, 0, 0)); 1960 break; 1961 } 1962 1963 case IIK_Move: 1964 case IIK_Copy: { 1965 bool Moving = ImplicitInitKind == IIK_Move; 1966 ParmVarDecl *Param = Constructor->getParamDecl(0); 1967 QualType ParamType = Param->getType().getNonReferenceType(); 1968 1969 Expr *CopyCtorArg = 1970 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1971 Constructor->getLocation(), ParamType, 1972 VK_LValue, 0); 1973 1974 // Cast to the base class to avoid ambiguities. 1975 QualType ArgTy = 1976 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1977 ParamType.getQualifiers()); 1978 1979 if (Moving) { 1980 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 1981 } 1982 1983 CXXCastPath BasePath; 1984 BasePath.push_back(BaseSpec); 1985 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1986 CK_UncheckedDerivedToBase, 1987 Moving ? VK_XValue : VK_LValue, 1988 &BasePath).take(); 1989 1990 InitializationKind InitKind 1991 = InitializationKind::CreateDirect(Constructor->getLocation(), 1992 SourceLocation(), SourceLocation()); 1993 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1994 &CopyCtorArg, 1); 1995 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1996 MultiExprArg(&CopyCtorArg, 1)); 1997 break; 1998 } 1999 } 2000 2001 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2002 if (BaseInit.isInvalid()) 2003 return true; 2004 2005 CXXBaseInit = 2006 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2007 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2008 SourceLocation()), 2009 BaseSpec->isVirtual(), 2010 SourceLocation(), 2011 BaseInit.takeAs<Expr>(), 2012 SourceLocation(), 2013 SourceLocation()); 2014 2015 return false; 2016} 2017 2018static bool RefersToRValueRef(Expr *MemRef) { 2019 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2020 return Referenced->getType()->isRValueReferenceType(); 2021} 2022 2023static bool 2024BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2025 ImplicitInitializerKind ImplicitInitKind, 2026 FieldDecl *Field, IndirectFieldDecl *Indirect, 2027 CXXCtorInitializer *&CXXMemberInit) { 2028 if (Field->isInvalidDecl()) 2029 return true; 2030 2031 SourceLocation Loc = Constructor->getLocation(); 2032 2033 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2034 bool Moving = ImplicitInitKind == IIK_Move; 2035 ParmVarDecl *Param = Constructor->getParamDecl(0); 2036 QualType ParamType = Param->getType().getNonReferenceType(); 2037 2038 // Suppress copying zero-width bitfields. 2039 if (const Expr *Width = Field->getBitWidth()) 2040 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 2041 return false; 2042 2043 Expr *MemberExprBase = 2044 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2045 Loc, ParamType, VK_LValue, 0); 2046 2047 if (Moving) { 2048 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2049 } 2050 2051 // Build a reference to this field within the parameter. 2052 CXXScopeSpec SS; 2053 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2054 Sema::LookupMemberName); 2055 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2056 : cast<ValueDecl>(Field), AS_public); 2057 MemberLookup.resolveKind(); 2058 ExprResult CtorArg 2059 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2060 ParamType, Loc, 2061 /*IsArrow=*/false, 2062 SS, 2063 /*FirstQualifierInScope=*/0, 2064 MemberLookup, 2065 /*TemplateArgs=*/0); 2066 if (CtorArg.isInvalid()) 2067 return true; 2068 2069 // C++11 [class.copy]p15: 2070 // - if a member m has rvalue reference type T&&, it is direct-initialized 2071 // with static_cast<T&&>(x.m); 2072 if (RefersToRValueRef(CtorArg.get())) { 2073 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2074 } 2075 2076 // When the field we are copying is an array, create index variables for 2077 // each dimension of the array. We use these index variables to subscript 2078 // the source array, and other clients (e.g., CodeGen) will perform the 2079 // necessary iteration with these index variables. 2080 SmallVector<VarDecl *, 4> IndexVariables; 2081 QualType BaseType = Field->getType(); 2082 QualType SizeType = SemaRef.Context.getSizeType(); 2083 bool InitializingArray = false; 2084 while (const ConstantArrayType *Array 2085 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2086 InitializingArray = true; 2087 // Create the iteration variable for this array index. 2088 IdentifierInfo *IterationVarName = 0; 2089 { 2090 llvm::SmallString<8> Str; 2091 llvm::raw_svector_ostream OS(Str); 2092 OS << "__i" << IndexVariables.size(); 2093 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2094 } 2095 VarDecl *IterationVar 2096 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2097 IterationVarName, SizeType, 2098 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2099 SC_None, SC_None); 2100 IndexVariables.push_back(IterationVar); 2101 2102 // Create a reference to the iteration variable. 2103 ExprResult IterationVarRef 2104 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2105 assert(!IterationVarRef.isInvalid() && 2106 "Reference to invented variable cannot fail!"); 2107 2108 // Subscript the array with this iteration variable. 2109 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2110 IterationVarRef.take(), 2111 Loc); 2112 if (CtorArg.isInvalid()) 2113 return true; 2114 2115 BaseType = Array->getElementType(); 2116 } 2117 2118 // The array subscript expression is an lvalue, which is wrong for moving. 2119 if (Moving && InitializingArray) 2120 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2121 2122 // Construct the entity that we will be initializing. For an array, this 2123 // will be first element in the array, which may require several levels 2124 // of array-subscript entities. 2125 SmallVector<InitializedEntity, 4> Entities; 2126 Entities.reserve(1 + IndexVariables.size()); 2127 if (Indirect) 2128 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2129 else 2130 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2131 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2132 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2133 0, 2134 Entities.back())); 2135 2136 // Direct-initialize to use the copy constructor. 2137 InitializationKind InitKind = 2138 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2139 2140 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2141 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2142 &CtorArgE, 1); 2143 2144 ExprResult MemberInit 2145 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2146 MultiExprArg(&CtorArgE, 1)); 2147 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2148 if (MemberInit.isInvalid()) 2149 return true; 2150 2151 if (Indirect) { 2152 assert(IndexVariables.size() == 0 && 2153 "Indirect field improperly initialized"); 2154 CXXMemberInit 2155 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2156 Loc, Loc, 2157 MemberInit.takeAs<Expr>(), 2158 Loc); 2159 } else 2160 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2161 Loc, MemberInit.takeAs<Expr>(), 2162 Loc, 2163 IndexVariables.data(), 2164 IndexVariables.size()); 2165 return false; 2166 } 2167 2168 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2169 2170 QualType FieldBaseElementType = 2171 SemaRef.Context.getBaseElementType(Field->getType()); 2172 2173 if (FieldBaseElementType->isRecordType()) { 2174 InitializedEntity InitEntity 2175 = Indirect? InitializedEntity::InitializeMember(Indirect) 2176 : InitializedEntity::InitializeMember(Field); 2177 InitializationKind InitKind = 2178 InitializationKind::CreateDefault(Loc); 2179 2180 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2181 ExprResult MemberInit = 2182 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2183 2184 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2185 if (MemberInit.isInvalid()) 2186 return true; 2187 2188 if (Indirect) 2189 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2190 Indirect, Loc, 2191 Loc, 2192 MemberInit.get(), 2193 Loc); 2194 else 2195 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2196 Field, Loc, Loc, 2197 MemberInit.get(), 2198 Loc); 2199 return false; 2200 } 2201 2202 if (!Field->getParent()->isUnion()) { 2203 if (FieldBaseElementType->isReferenceType()) { 2204 SemaRef.Diag(Constructor->getLocation(), 2205 diag::err_uninitialized_member_in_ctor) 2206 << (int)Constructor->isImplicit() 2207 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2208 << 0 << Field->getDeclName(); 2209 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2210 return true; 2211 } 2212 2213 if (FieldBaseElementType.isConstQualified()) { 2214 SemaRef.Diag(Constructor->getLocation(), 2215 diag::err_uninitialized_member_in_ctor) 2216 << (int)Constructor->isImplicit() 2217 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2218 << 1 << Field->getDeclName(); 2219 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2220 return true; 2221 } 2222 } 2223 2224 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2225 FieldBaseElementType->isObjCRetainableType() && 2226 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2227 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2228 // Instant objects: 2229 // Default-initialize Objective-C pointers to NULL. 2230 CXXMemberInit 2231 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2232 Loc, Loc, 2233 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2234 Loc); 2235 return false; 2236 } 2237 2238 // Nothing to initialize. 2239 CXXMemberInit = 0; 2240 return false; 2241} 2242 2243namespace { 2244struct BaseAndFieldInfo { 2245 Sema &S; 2246 CXXConstructorDecl *Ctor; 2247 bool AnyErrorsInInits; 2248 ImplicitInitializerKind IIK; 2249 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2250 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2251 2252 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2253 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2254 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2255 if (Generated && Ctor->isCopyConstructor()) 2256 IIK = IIK_Copy; 2257 else if (Generated && Ctor->isMoveConstructor()) 2258 IIK = IIK_Move; 2259 else 2260 IIK = IIK_Default; 2261 } 2262}; 2263} 2264 2265static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2266 FieldDecl *Field, 2267 IndirectFieldDecl *Indirect = 0) { 2268 2269 // Overwhelmingly common case: we have a direct initializer for this field. 2270 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2271 Info.AllToInit.push_back(Init); 2272 return false; 2273 } 2274 2275 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2276 // has a brace-or-equal-initializer, the entity is initialized as specified 2277 // in [dcl.init]. 2278 if (Field->hasInClassInitializer()) { 2279 CXXCtorInitializer *Init; 2280 if (Indirect) 2281 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2282 SourceLocation(), 2283 SourceLocation(), 0, 2284 SourceLocation()); 2285 else 2286 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2287 SourceLocation(), 2288 SourceLocation(), 0, 2289 SourceLocation()); 2290 Info.AllToInit.push_back(Init); 2291 return false; 2292 } 2293 2294 // Don't build an implicit initializer for union members if none was 2295 // explicitly specified. 2296 if (Field->getParent()->isUnion()) 2297 return false; 2298 2299 // Don't try to build an implicit initializer if there were semantic 2300 // errors in any of the initializers (and therefore we might be 2301 // missing some that the user actually wrote). 2302 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2303 return false; 2304 2305 CXXCtorInitializer *Init = 0; 2306 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2307 Indirect, Init)) 2308 return true; 2309 2310 if (Init) 2311 Info.AllToInit.push_back(Init); 2312 2313 return false; 2314} 2315 2316bool 2317Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2318 CXXCtorInitializer *Initializer) { 2319 assert(Initializer->isDelegatingInitializer()); 2320 Constructor->setNumCtorInitializers(1); 2321 CXXCtorInitializer **initializer = 2322 new (Context) CXXCtorInitializer*[1]; 2323 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2324 Constructor->setCtorInitializers(initializer); 2325 2326 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2327 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2328 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2329 } 2330 2331 DelegatingCtorDecls.push_back(Constructor); 2332 2333 return false; 2334} 2335 2336bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2337 CXXCtorInitializer **Initializers, 2338 unsigned NumInitializers, 2339 bool AnyErrors) { 2340 if (Constructor->getDeclContext()->isDependentContext()) { 2341 // Just store the initializers as written, they will be checked during 2342 // instantiation. 2343 if (NumInitializers > 0) { 2344 Constructor->setNumCtorInitializers(NumInitializers); 2345 CXXCtorInitializer **baseOrMemberInitializers = 2346 new (Context) CXXCtorInitializer*[NumInitializers]; 2347 memcpy(baseOrMemberInitializers, Initializers, 2348 NumInitializers * sizeof(CXXCtorInitializer*)); 2349 Constructor->setCtorInitializers(baseOrMemberInitializers); 2350 } 2351 2352 return false; 2353 } 2354 2355 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2356 2357 // We need to build the initializer AST according to order of construction 2358 // and not what user specified in the Initializers list. 2359 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2360 if (!ClassDecl) 2361 return true; 2362 2363 bool HadError = false; 2364 2365 for (unsigned i = 0; i < NumInitializers; i++) { 2366 CXXCtorInitializer *Member = Initializers[i]; 2367 2368 if (Member->isBaseInitializer()) 2369 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2370 else 2371 Info.AllBaseFields[Member->getAnyMember()] = Member; 2372 } 2373 2374 // Keep track of the direct virtual bases. 2375 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2376 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2377 E = ClassDecl->bases_end(); I != E; ++I) { 2378 if (I->isVirtual()) 2379 DirectVBases.insert(I); 2380 } 2381 2382 // Push virtual bases before others. 2383 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2384 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2385 2386 if (CXXCtorInitializer *Value 2387 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2388 Info.AllToInit.push_back(Value); 2389 } else if (!AnyErrors) { 2390 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2391 CXXCtorInitializer *CXXBaseInit; 2392 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2393 VBase, IsInheritedVirtualBase, 2394 CXXBaseInit)) { 2395 HadError = true; 2396 continue; 2397 } 2398 2399 Info.AllToInit.push_back(CXXBaseInit); 2400 } 2401 } 2402 2403 // Non-virtual bases. 2404 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2405 E = ClassDecl->bases_end(); Base != E; ++Base) { 2406 // Virtuals are in the virtual base list and already constructed. 2407 if (Base->isVirtual()) 2408 continue; 2409 2410 if (CXXCtorInitializer *Value 2411 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2412 Info.AllToInit.push_back(Value); 2413 } else if (!AnyErrors) { 2414 CXXCtorInitializer *CXXBaseInit; 2415 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2416 Base, /*IsInheritedVirtualBase=*/false, 2417 CXXBaseInit)) { 2418 HadError = true; 2419 continue; 2420 } 2421 2422 Info.AllToInit.push_back(CXXBaseInit); 2423 } 2424 } 2425 2426 // Fields. 2427 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2428 MemEnd = ClassDecl->decls_end(); 2429 Mem != MemEnd; ++Mem) { 2430 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2431 if (F->getType()->isIncompleteArrayType()) { 2432 assert(ClassDecl->hasFlexibleArrayMember() && 2433 "Incomplete array type is not valid"); 2434 continue; 2435 } 2436 2437 // If we're not generating the implicit copy/move constructor, then we'll 2438 // handle anonymous struct/union fields based on their individual 2439 // indirect fields. 2440 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2441 continue; 2442 2443 if (CollectFieldInitializer(*this, Info, F)) 2444 HadError = true; 2445 continue; 2446 } 2447 2448 // Beyond this point, we only consider default initialization. 2449 if (Info.IIK != IIK_Default) 2450 continue; 2451 2452 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2453 if (F->getType()->isIncompleteArrayType()) { 2454 assert(ClassDecl->hasFlexibleArrayMember() && 2455 "Incomplete array type is not valid"); 2456 continue; 2457 } 2458 2459 // Initialize each field of an anonymous struct individually. 2460 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2461 HadError = true; 2462 2463 continue; 2464 } 2465 } 2466 2467 NumInitializers = Info.AllToInit.size(); 2468 if (NumInitializers > 0) { 2469 Constructor->setNumCtorInitializers(NumInitializers); 2470 CXXCtorInitializer **baseOrMemberInitializers = 2471 new (Context) CXXCtorInitializer*[NumInitializers]; 2472 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2473 NumInitializers * sizeof(CXXCtorInitializer*)); 2474 Constructor->setCtorInitializers(baseOrMemberInitializers); 2475 2476 // Constructors implicitly reference the base and member 2477 // destructors. 2478 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2479 Constructor->getParent()); 2480 } 2481 2482 return HadError; 2483} 2484 2485static void *GetKeyForTopLevelField(FieldDecl *Field) { 2486 // For anonymous unions, use the class declaration as the key. 2487 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2488 if (RT->getDecl()->isAnonymousStructOrUnion()) 2489 return static_cast<void *>(RT->getDecl()); 2490 } 2491 return static_cast<void *>(Field); 2492} 2493 2494static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2495 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2496} 2497 2498static void *GetKeyForMember(ASTContext &Context, 2499 CXXCtorInitializer *Member) { 2500 if (!Member->isAnyMemberInitializer()) 2501 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2502 2503 // For fields injected into the class via declaration of an anonymous union, 2504 // use its anonymous union class declaration as the unique key. 2505 FieldDecl *Field = Member->getAnyMember(); 2506 2507 // If the field is a member of an anonymous struct or union, our key 2508 // is the anonymous record decl that's a direct child of the class. 2509 RecordDecl *RD = Field->getParent(); 2510 if (RD->isAnonymousStructOrUnion()) { 2511 while (true) { 2512 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2513 if (Parent->isAnonymousStructOrUnion()) 2514 RD = Parent; 2515 else 2516 break; 2517 } 2518 2519 return static_cast<void *>(RD); 2520 } 2521 2522 return static_cast<void *>(Field); 2523} 2524 2525static void 2526DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2527 const CXXConstructorDecl *Constructor, 2528 CXXCtorInitializer **Inits, 2529 unsigned NumInits) { 2530 if (Constructor->getDeclContext()->isDependentContext()) 2531 return; 2532 2533 // Don't check initializers order unless the warning is enabled at the 2534 // location of at least one initializer. 2535 bool ShouldCheckOrder = false; 2536 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2537 CXXCtorInitializer *Init = Inits[InitIndex]; 2538 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2539 Init->getSourceLocation()) 2540 != Diagnostic::Ignored) { 2541 ShouldCheckOrder = true; 2542 break; 2543 } 2544 } 2545 if (!ShouldCheckOrder) 2546 return; 2547 2548 // Build the list of bases and members in the order that they'll 2549 // actually be initialized. The explicit initializers should be in 2550 // this same order but may be missing things. 2551 SmallVector<const void*, 32> IdealInitKeys; 2552 2553 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2554 2555 // 1. Virtual bases. 2556 for (CXXRecordDecl::base_class_const_iterator VBase = 2557 ClassDecl->vbases_begin(), 2558 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2559 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2560 2561 // 2. Non-virtual bases. 2562 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2563 E = ClassDecl->bases_end(); Base != E; ++Base) { 2564 if (Base->isVirtual()) 2565 continue; 2566 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2567 } 2568 2569 // 3. Direct fields. 2570 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2571 E = ClassDecl->field_end(); Field != E; ++Field) 2572 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2573 2574 unsigned NumIdealInits = IdealInitKeys.size(); 2575 unsigned IdealIndex = 0; 2576 2577 CXXCtorInitializer *PrevInit = 0; 2578 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2579 CXXCtorInitializer *Init = Inits[InitIndex]; 2580 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2581 2582 // Scan forward to try to find this initializer in the idealized 2583 // initializers list. 2584 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2585 if (InitKey == IdealInitKeys[IdealIndex]) 2586 break; 2587 2588 // If we didn't find this initializer, it must be because we 2589 // scanned past it on a previous iteration. That can only 2590 // happen if we're out of order; emit a warning. 2591 if (IdealIndex == NumIdealInits && PrevInit) { 2592 Sema::SemaDiagnosticBuilder D = 2593 SemaRef.Diag(PrevInit->getSourceLocation(), 2594 diag::warn_initializer_out_of_order); 2595 2596 if (PrevInit->isAnyMemberInitializer()) 2597 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2598 else 2599 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2600 2601 if (Init->isAnyMemberInitializer()) 2602 D << 0 << Init->getAnyMember()->getDeclName(); 2603 else 2604 D << 1 << Init->getBaseClassInfo()->getType(); 2605 2606 // Move back to the initializer's location in the ideal list. 2607 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2608 if (InitKey == IdealInitKeys[IdealIndex]) 2609 break; 2610 2611 assert(IdealIndex != NumIdealInits && 2612 "initializer not found in initializer list"); 2613 } 2614 2615 PrevInit = Init; 2616 } 2617} 2618 2619namespace { 2620bool CheckRedundantInit(Sema &S, 2621 CXXCtorInitializer *Init, 2622 CXXCtorInitializer *&PrevInit) { 2623 if (!PrevInit) { 2624 PrevInit = Init; 2625 return false; 2626 } 2627 2628 if (FieldDecl *Field = Init->getMember()) 2629 S.Diag(Init->getSourceLocation(), 2630 diag::err_multiple_mem_initialization) 2631 << Field->getDeclName() 2632 << Init->getSourceRange(); 2633 else { 2634 const Type *BaseClass = Init->getBaseClass(); 2635 assert(BaseClass && "neither field nor base"); 2636 S.Diag(Init->getSourceLocation(), 2637 diag::err_multiple_base_initialization) 2638 << QualType(BaseClass, 0) 2639 << Init->getSourceRange(); 2640 } 2641 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2642 << 0 << PrevInit->getSourceRange(); 2643 2644 return true; 2645} 2646 2647typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2648typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2649 2650bool CheckRedundantUnionInit(Sema &S, 2651 CXXCtorInitializer *Init, 2652 RedundantUnionMap &Unions) { 2653 FieldDecl *Field = Init->getAnyMember(); 2654 RecordDecl *Parent = Field->getParent(); 2655 if (!Parent->isAnonymousStructOrUnion()) 2656 return false; 2657 2658 NamedDecl *Child = Field; 2659 do { 2660 if (Parent->isUnion()) { 2661 UnionEntry &En = Unions[Parent]; 2662 if (En.first && En.first != Child) { 2663 S.Diag(Init->getSourceLocation(), 2664 diag::err_multiple_mem_union_initialization) 2665 << Field->getDeclName() 2666 << Init->getSourceRange(); 2667 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2668 << 0 << En.second->getSourceRange(); 2669 return true; 2670 } else if (!En.first) { 2671 En.first = Child; 2672 En.second = Init; 2673 } 2674 } 2675 2676 Child = Parent; 2677 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2678 } while (Parent->isAnonymousStructOrUnion()); 2679 2680 return false; 2681} 2682} 2683 2684/// ActOnMemInitializers - Handle the member initializers for a constructor. 2685void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2686 SourceLocation ColonLoc, 2687 CXXCtorInitializer **meminits, 2688 unsigned NumMemInits, 2689 bool AnyErrors) { 2690 if (!ConstructorDecl) 2691 return; 2692 2693 AdjustDeclIfTemplate(ConstructorDecl); 2694 2695 CXXConstructorDecl *Constructor 2696 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2697 2698 if (!Constructor) { 2699 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2700 return; 2701 } 2702 2703 CXXCtorInitializer **MemInits = 2704 reinterpret_cast<CXXCtorInitializer **>(meminits); 2705 2706 // Mapping for the duplicate initializers check. 2707 // For member initializers, this is keyed with a FieldDecl*. 2708 // For base initializers, this is keyed with a Type*. 2709 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2710 2711 // Mapping for the inconsistent anonymous-union initializers check. 2712 RedundantUnionMap MemberUnions; 2713 2714 bool HadError = false; 2715 for (unsigned i = 0; i < NumMemInits; i++) { 2716 CXXCtorInitializer *Init = MemInits[i]; 2717 2718 // Set the source order index. 2719 Init->setSourceOrder(i); 2720 2721 if (Init->isAnyMemberInitializer()) { 2722 FieldDecl *Field = Init->getAnyMember(); 2723 if (CheckRedundantInit(*this, Init, Members[Field]) || 2724 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2725 HadError = true; 2726 } else if (Init->isBaseInitializer()) { 2727 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2728 if (CheckRedundantInit(*this, Init, Members[Key])) 2729 HadError = true; 2730 } else { 2731 assert(Init->isDelegatingInitializer()); 2732 // This must be the only initializer 2733 if (i != 0 || NumMemInits > 1) { 2734 Diag(MemInits[0]->getSourceLocation(), 2735 diag::err_delegating_initializer_alone) 2736 << MemInits[0]->getSourceRange(); 2737 HadError = true; 2738 // We will treat this as being the only initializer. 2739 } 2740 SetDelegatingInitializer(Constructor, MemInits[i]); 2741 // Return immediately as the initializer is set. 2742 return; 2743 } 2744 } 2745 2746 if (HadError) 2747 return; 2748 2749 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2750 2751 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2752} 2753 2754void 2755Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2756 CXXRecordDecl *ClassDecl) { 2757 // Ignore dependent contexts. Also ignore unions, since their members never 2758 // have destructors implicitly called. 2759 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 2760 return; 2761 2762 // FIXME: all the access-control diagnostics are positioned on the 2763 // field/base declaration. That's probably good; that said, the 2764 // user might reasonably want to know why the destructor is being 2765 // emitted, and we currently don't say. 2766 2767 // Non-static data members. 2768 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2769 E = ClassDecl->field_end(); I != E; ++I) { 2770 FieldDecl *Field = *I; 2771 if (Field->isInvalidDecl()) 2772 continue; 2773 QualType FieldType = Context.getBaseElementType(Field->getType()); 2774 2775 const RecordType* RT = FieldType->getAs<RecordType>(); 2776 if (!RT) 2777 continue; 2778 2779 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2780 if (FieldClassDecl->isInvalidDecl()) 2781 continue; 2782 if (FieldClassDecl->hasTrivialDestructor()) 2783 continue; 2784 2785 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2786 assert(Dtor && "No dtor found for FieldClassDecl!"); 2787 CheckDestructorAccess(Field->getLocation(), Dtor, 2788 PDiag(diag::err_access_dtor_field) 2789 << Field->getDeclName() 2790 << FieldType); 2791 2792 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2793 } 2794 2795 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2796 2797 // Bases. 2798 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2799 E = ClassDecl->bases_end(); Base != E; ++Base) { 2800 // Bases are always records in a well-formed non-dependent class. 2801 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2802 2803 // Remember direct virtual bases. 2804 if (Base->isVirtual()) 2805 DirectVirtualBases.insert(RT); 2806 2807 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2808 // If our base class is invalid, we probably can't get its dtor anyway. 2809 if (BaseClassDecl->isInvalidDecl()) 2810 continue; 2811 // Ignore trivial destructors. 2812 if (BaseClassDecl->hasTrivialDestructor()) 2813 continue; 2814 2815 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2816 assert(Dtor && "No dtor found for BaseClassDecl!"); 2817 2818 // FIXME: caret should be on the start of the class name 2819 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2820 PDiag(diag::err_access_dtor_base) 2821 << Base->getType() 2822 << Base->getSourceRange()); 2823 2824 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2825 } 2826 2827 // Virtual bases. 2828 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2829 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2830 2831 // Bases are always records in a well-formed non-dependent class. 2832 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2833 2834 // Ignore direct virtual bases. 2835 if (DirectVirtualBases.count(RT)) 2836 continue; 2837 2838 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2839 // If our base class is invalid, we probably can't get its dtor anyway. 2840 if (BaseClassDecl->isInvalidDecl()) 2841 continue; 2842 // Ignore trivial destructors. 2843 if (BaseClassDecl->hasTrivialDestructor()) 2844 continue; 2845 2846 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2847 assert(Dtor && "No dtor found for BaseClassDecl!"); 2848 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2849 PDiag(diag::err_access_dtor_vbase) 2850 << VBase->getType()); 2851 2852 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2853 } 2854} 2855 2856void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2857 if (!CDtorDecl) 2858 return; 2859 2860 if (CXXConstructorDecl *Constructor 2861 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2862 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2863} 2864 2865bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2866 unsigned DiagID, AbstractDiagSelID SelID) { 2867 if (SelID == -1) 2868 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2869 else 2870 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2871} 2872 2873bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2874 const PartialDiagnostic &PD) { 2875 if (!getLangOptions().CPlusPlus) 2876 return false; 2877 2878 if (const ArrayType *AT = Context.getAsArrayType(T)) 2879 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2880 2881 if (const PointerType *PT = T->getAs<PointerType>()) { 2882 // Find the innermost pointer type. 2883 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2884 PT = T; 2885 2886 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2887 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2888 } 2889 2890 const RecordType *RT = T->getAs<RecordType>(); 2891 if (!RT) 2892 return false; 2893 2894 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2895 2896 // We can't answer whether something is abstract until it has a 2897 // definition. If it's currently being defined, we'll walk back 2898 // over all the declarations when we have a full definition. 2899 const CXXRecordDecl *Def = RD->getDefinition(); 2900 if (!Def || Def->isBeingDefined()) 2901 return false; 2902 2903 if (!RD->isAbstract()) 2904 return false; 2905 2906 Diag(Loc, PD) << RD->getDeclName(); 2907 DiagnoseAbstractType(RD); 2908 2909 return true; 2910} 2911 2912void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2913 // Check if we've already emitted the list of pure virtual functions 2914 // for this class. 2915 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2916 return; 2917 2918 CXXFinalOverriderMap FinalOverriders; 2919 RD->getFinalOverriders(FinalOverriders); 2920 2921 // Keep a set of seen pure methods so we won't diagnose the same method 2922 // more than once. 2923 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2924 2925 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2926 MEnd = FinalOverriders.end(); 2927 M != MEnd; 2928 ++M) { 2929 for (OverridingMethods::iterator SO = M->second.begin(), 2930 SOEnd = M->second.end(); 2931 SO != SOEnd; ++SO) { 2932 // C++ [class.abstract]p4: 2933 // A class is abstract if it contains or inherits at least one 2934 // pure virtual function for which the final overrider is pure 2935 // virtual. 2936 2937 // 2938 if (SO->second.size() != 1) 2939 continue; 2940 2941 if (!SO->second.front().Method->isPure()) 2942 continue; 2943 2944 if (!SeenPureMethods.insert(SO->second.front().Method)) 2945 continue; 2946 2947 Diag(SO->second.front().Method->getLocation(), 2948 diag::note_pure_virtual_function) 2949 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2950 } 2951 } 2952 2953 if (!PureVirtualClassDiagSet) 2954 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2955 PureVirtualClassDiagSet->insert(RD); 2956} 2957 2958namespace { 2959struct AbstractUsageInfo { 2960 Sema &S; 2961 CXXRecordDecl *Record; 2962 CanQualType AbstractType; 2963 bool Invalid; 2964 2965 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2966 : S(S), Record(Record), 2967 AbstractType(S.Context.getCanonicalType( 2968 S.Context.getTypeDeclType(Record))), 2969 Invalid(false) {} 2970 2971 void DiagnoseAbstractType() { 2972 if (Invalid) return; 2973 S.DiagnoseAbstractType(Record); 2974 Invalid = true; 2975 } 2976 2977 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2978}; 2979 2980struct CheckAbstractUsage { 2981 AbstractUsageInfo &Info; 2982 const NamedDecl *Ctx; 2983 2984 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2985 : Info(Info), Ctx(Ctx) {} 2986 2987 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2988 switch (TL.getTypeLocClass()) { 2989#define ABSTRACT_TYPELOC(CLASS, PARENT) 2990#define TYPELOC(CLASS, PARENT) \ 2991 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2992#include "clang/AST/TypeLocNodes.def" 2993 } 2994 } 2995 2996 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2997 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2998 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2999 if (!TL.getArg(I)) 3000 continue; 3001 3002 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3003 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3004 } 3005 } 3006 3007 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3008 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3009 } 3010 3011 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3012 // Visit the type parameters from a permissive context. 3013 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3014 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3015 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3016 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3017 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3018 // TODO: other template argument types? 3019 } 3020 } 3021 3022 // Visit pointee types from a permissive context. 3023#define CheckPolymorphic(Type) \ 3024 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3025 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3026 } 3027 CheckPolymorphic(PointerTypeLoc) 3028 CheckPolymorphic(ReferenceTypeLoc) 3029 CheckPolymorphic(MemberPointerTypeLoc) 3030 CheckPolymorphic(BlockPointerTypeLoc) 3031 3032 /// Handle all the types we haven't given a more specific 3033 /// implementation for above. 3034 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3035 // Every other kind of type that we haven't called out already 3036 // that has an inner type is either (1) sugar or (2) contains that 3037 // inner type in some way as a subobject. 3038 if (TypeLoc Next = TL.getNextTypeLoc()) 3039 return Visit(Next, Sel); 3040 3041 // If there's no inner type and we're in a permissive context, 3042 // don't diagnose. 3043 if (Sel == Sema::AbstractNone) return; 3044 3045 // Check whether the type matches the abstract type. 3046 QualType T = TL.getType(); 3047 if (T->isArrayType()) { 3048 Sel = Sema::AbstractArrayType; 3049 T = Info.S.Context.getBaseElementType(T); 3050 } 3051 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3052 if (CT != Info.AbstractType) return; 3053 3054 // It matched; do some magic. 3055 if (Sel == Sema::AbstractArrayType) { 3056 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3057 << T << TL.getSourceRange(); 3058 } else { 3059 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3060 << Sel << T << TL.getSourceRange(); 3061 } 3062 Info.DiagnoseAbstractType(); 3063 } 3064}; 3065 3066void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3067 Sema::AbstractDiagSelID Sel) { 3068 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3069} 3070 3071} 3072 3073/// Check for invalid uses of an abstract type in a method declaration. 3074static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3075 CXXMethodDecl *MD) { 3076 // No need to do the check on definitions, which require that 3077 // the return/param types be complete. 3078 if (MD->doesThisDeclarationHaveABody()) 3079 return; 3080 3081 // For safety's sake, just ignore it if we don't have type source 3082 // information. This should never happen for non-implicit methods, 3083 // but... 3084 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3085 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3086} 3087 3088/// Check for invalid uses of an abstract type within a class definition. 3089static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3090 CXXRecordDecl *RD) { 3091 for (CXXRecordDecl::decl_iterator 3092 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3093 Decl *D = *I; 3094 if (D->isImplicit()) continue; 3095 3096 // Methods and method templates. 3097 if (isa<CXXMethodDecl>(D)) { 3098 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3099 } else if (isa<FunctionTemplateDecl>(D)) { 3100 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3101 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3102 3103 // Fields and static variables. 3104 } else if (isa<FieldDecl>(D)) { 3105 FieldDecl *FD = cast<FieldDecl>(D); 3106 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3107 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3108 } else if (isa<VarDecl>(D)) { 3109 VarDecl *VD = cast<VarDecl>(D); 3110 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3111 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3112 3113 // Nested classes and class templates. 3114 } else if (isa<CXXRecordDecl>(D)) { 3115 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3116 } else if (isa<ClassTemplateDecl>(D)) { 3117 CheckAbstractClassUsage(Info, 3118 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3119 } 3120 } 3121} 3122 3123/// \brief Perform semantic checks on a class definition that has been 3124/// completing, introducing implicitly-declared members, checking for 3125/// abstract types, etc. 3126void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3127 if (!Record) 3128 return; 3129 3130 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3131 AbstractUsageInfo Info(*this, Record); 3132 CheckAbstractClassUsage(Info, Record); 3133 } 3134 3135 // If this is not an aggregate type and has no user-declared constructor, 3136 // complain about any non-static data members of reference or const scalar 3137 // type, since they will never get initializers. 3138 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3139 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3140 bool Complained = false; 3141 for (RecordDecl::field_iterator F = Record->field_begin(), 3142 FEnd = Record->field_end(); 3143 F != FEnd; ++F) { 3144 if (F->hasInClassInitializer()) 3145 continue; 3146 3147 if (F->getType()->isReferenceType() || 3148 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3149 if (!Complained) { 3150 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3151 << Record->getTagKind() << Record; 3152 Complained = true; 3153 } 3154 3155 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3156 << F->getType()->isReferenceType() 3157 << F->getDeclName(); 3158 } 3159 } 3160 } 3161 3162 if (Record->isDynamicClass() && !Record->isDependentType()) 3163 DynamicClasses.push_back(Record); 3164 3165 if (Record->getIdentifier()) { 3166 // C++ [class.mem]p13: 3167 // If T is the name of a class, then each of the following shall have a 3168 // name different from T: 3169 // - every member of every anonymous union that is a member of class T. 3170 // 3171 // C++ [class.mem]p14: 3172 // In addition, if class T has a user-declared constructor (12.1), every 3173 // non-static data member of class T shall have a name different from T. 3174 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3175 R.first != R.second; ++R.first) { 3176 NamedDecl *D = *R.first; 3177 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3178 isa<IndirectFieldDecl>(D)) { 3179 Diag(D->getLocation(), diag::err_member_name_of_class) 3180 << D->getDeclName(); 3181 break; 3182 } 3183 } 3184 } 3185 3186 // Warn if the class has virtual methods but non-virtual public destructor. 3187 if (Record->isPolymorphic() && !Record->isDependentType()) { 3188 CXXDestructorDecl *dtor = Record->getDestructor(); 3189 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3190 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3191 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3192 } 3193 3194 // See if a method overloads virtual methods in a base 3195 /// class without overriding any. 3196 if (!Record->isDependentType()) { 3197 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3198 MEnd = Record->method_end(); 3199 M != MEnd; ++M) { 3200 if (!(*M)->isStatic()) 3201 DiagnoseHiddenVirtualMethods(Record, *M); 3202 } 3203 } 3204 3205 // Declare inherited constructors. We do this eagerly here because: 3206 // - The standard requires an eager diagnostic for conflicting inherited 3207 // constructors from different classes. 3208 // - The lazy declaration of the other implicit constructors is so as to not 3209 // waste space and performance on classes that are not meant to be 3210 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3211 // have inherited constructors. 3212 DeclareInheritedConstructors(Record); 3213 3214 if (!Record->isDependentType()) 3215 CheckExplicitlyDefaultedMethods(Record); 3216} 3217 3218void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3219 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3220 ME = Record->method_end(); 3221 MI != ME; ++MI) { 3222 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3223 switch (getSpecialMember(*MI)) { 3224 case CXXDefaultConstructor: 3225 CheckExplicitlyDefaultedDefaultConstructor( 3226 cast<CXXConstructorDecl>(*MI)); 3227 break; 3228 3229 case CXXDestructor: 3230 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3231 break; 3232 3233 case CXXCopyConstructor: 3234 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3235 break; 3236 3237 case CXXCopyAssignment: 3238 CheckExplicitlyDefaultedCopyAssignment(*MI); 3239 break; 3240 3241 case CXXMoveConstructor: 3242 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3243 break; 3244 3245 case CXXMoveAssignment: 3246 CheckExplicitlyDefaultedMoveAssignment(*MI); 3247 break; 3248 3249 case CXXInvalid: 3250 llvm_unreachable("non-special member explicitly defaulted!"); 3251 } 3252 } 3253 } 3254 3255} 3256 3257void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3258 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3259 3260 // Whether this was the first-declared instance of the constructor. 3261 // This affects whether we implicitly add an exception spec (and, eventually, 3262 // constexpr). It is also ill-formed to explicitly default a constructor such 3263 // that it would be deleted. (C++0x [decl.fct.def.default]) 3264 bool First = CD == CD->getCanonicalDecl(); 3265 3266 bool HadError = false; 3267 if (CD->getNumParams() != 0) { 3268 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3269 << CD->getSourceRange(); 3270 HadError = true; 3271 } 3272 3273 ImplicitExceptionSpecification Spec 3274 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3275 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3276 if (EPI.ExceptionSpecType == EST_Delayed) { 3277 // Exception specification depends on some deferred part of the class. We'll 3278 // try again when the class's definition has been fully processed. 3279 return; 3280 } 3281 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3282 *ExceptionType = Context.getFunctionType( 3283 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3284 3285 if (CtorType->hasExceptionSpec()) { 3286 if (CheckEquivalentExceptionSpec( 3287 PDiag(diag::err_incorrect_defaulted_exception_spec) 3288 << CXXDefaultConstructor, 3289 PDiag(), 3290 ExceptionType, SourceLocation(), 3291 CtorType, CD->getLocation())) { 3292 HadError = true; 3293 } 3294 } else if (First) { 3295 // We set the declaration to have the computed exception spec here. 3296 // We know there are no parameters. 3297 EPI.ExtInfo = CtorType->getExtInfo(); 3298 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3299 } 3300 3301 if (HadError) { 3302 CD->setInvalidDecl(); 3303 return; 3304 } 3305 3306 if (ShouldDeleteDefaultConstructor(CD)) { 3307 if (First) { 3308 CD->setDeletedAsWritten(); 3309 } else { 3310 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3311 << CXXDefaultConstructor; 3312 CD->setInvalidDecl(); 3313 } 3314 } 3315} 3316 3317void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3318 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3319 3320 // Whether this was the first-declared instance of the constructor. 3321 bool First = CD == CD->getCanonicalDecl(); 3322 3323 bool HadError = false; 3324 if (CD->getNumParams() != 1) { 3325 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3326 << CD->getSourceRange(); 3327 HadError = true; 3328 } 3329 3330 ImplicitExceptionSpecification Spec(Context); 3331 bool Const; 3332 llvm::tie(Spec, Const) = 3333 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3334 3335 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3336 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3337 *ExceptionType = Context.getFunctionType( 3338 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3339 3340 // Check for parameter type matching. 3341 // This is a copy ctor so we know it's a cv-qualified reference to T. 3342 QualType ArgType = CtorType->getArgType(0); 3343 if (ArgType->getPointeeType().isVolatileQualified()) { 3344 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3345 HadError = true; 3346 } 3347 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3348 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3349 HadError = true; 3350 } 3351 3352 if (CtorType->hasExceptionSpec()) { 3353 if (CheckEquivalentExceptionSpec( 3354 PDiag(diag::err_incorrect_defaulted_exception_spec) 3355 << CXXCopyConstructor, 3356 PDiag(), 3357 ExceptionType, SourceLocation(), 3358 CtorType, CD->getLocation())) { 3359 HadError = true; 3360 } 3361 } else if (First) { 3362 // We set the declaration to have the computed exception spec here. 3363 // We duplicate the one parameter type. 3364 EPI.ExtInfo = CtorType->getExtInfo(); 3365 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3366 } 3367 3368 if (HadError) { 3369 CD->setInvalidDecl(); 3370 return; 3371 } 3372 3373 if (ShouldDeleteCopyConstructor(CD)) { 3374 if (First) { 3375 CD->setDeletedAsWritten(); 3376 } else { 3377 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3378 << CXXCopyConstructor; 3379 CD->setInvalidDecl(); 3380 } 3381 } 3382} 3383 3384void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3385 assert(MD->isExplicitlyDefaulted()); 3386 3387 // Whether this was the first-declared instance of the operator 3388 bool First = MD == MD->getCanonicalDecl(); 3389 3390 bool HadError = false; 3391 if (MD->getNumParams() != 1) { 3392 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3393 << MD->getSourceRange(); 3394 HadError = true; 3395 } 3396 3397 QualType ReturnType = 3398 MD->getType()->getAs<FunctionType>()->getResultType(); 3399 if (!ReturnType->isLValueReferenceType() || 3400 !Context.hasSameType( 3401 Context.getCanonicalType(ReturnType->getPointeeType()), 3402 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3403 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3404 HadError = true; 3405 } 3406 3407 ImplicitExceptionSpecification Spec(Context); 3408 bool Const; 3409 llvm::tie(Spec, Const) = 3410 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3411 3412 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3413 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3414 *ExceptionType = Context.getFunctionType( 3415 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3416 3417 QualType ArgType = OperType->getArgType(0); 3418 if (!ArgType->isLValueReferenceType()) { 3419 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3420 HadError = true; 3421 } else { 3422 if (ArgType->getPointeeType().isVolatileQualified()) { 3423 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3424 HadError = true; 3425 } 3426 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3427 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3428 HadError = true; 3429 } 3430 } 3431 3432 if (OperType->getTypeQuals()) { 3433 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3434 HadError = true; 3435 } 3436 3437 if (OperType->hasExceptionSpec()) { 3438 if (CheckEquivalentExceptionSpec( 3439 PDiag(diag::err_incorrect_defaulted_exception_spec) 3440 << CXXCopyAssignment, 3441 PDiag(), 3442 ExceptionType, SourceLocation(), 3443 OperType, MD->getLocation())) { 3444 HadError = true; 3445 } 3446 } else if (First) { 3447 // We set the declaration to have the computed exception spec here. 3448 // We duplicate the one parameter type. 3449 EPI.RefQualifier = OperType->getRefQualifier(); 3450 EPI.ExtInfo = OperType->getExtInfo(); 3451 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3452 } 3453 3454 if (HadError) { 3455 MD->setInvalidDecl(); 3456 return; 3457 } 3458 3459 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3460 if (First) { 3461 MD->setDeletedAsWritten(); 3462 } else { 3463 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3464 << CXXCopyAssignment; 3465 MD->setInvalidDecl(); 3466 } 3467 } 3468} 3469 3470void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3471 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3472 3473 // Whether this was the first-declared instance of the constructor. 3474 bool First = CD == CD->getCanonicalDecl(); 3475 3476 bool HadError = false; 3477 if (CD->getNumParams() != 1) { 3478 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3479 << CD->getSourceRange(); 3480 HadError = true; 3481 } 3482 3483 ImplicitExceptionSpecification Spec( 3484 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3485 3486 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3487 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3488 *ExceptionType = Context.getFunctionType( 3489 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3490 3491 // Check for parameter type matching. 3492 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3493 QualType ArgType = CtorType->getArgType(0); 3494 if (ArgType->getPointeeType().isVolatileQualified()) { 3495 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3496 HadError = true; 3497 } 3498 if (ArgType->getPointeeType().isConstQualified()) { 3499 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3500 HadError = true; 3501 } 3502 3503 if (CtorType->hasExceptionSpec()) { 3504 if (CheckEquivalentExceptionSpec( 3505 PDiag(diag::err_incorrect_defaulted_exception_spec) 3506 << CXXMoveConstructor, 3507 PDiag(), 3508 ExceptionType, SourceLocation(), 3509 CtorType, CD->getLocation())) { 3510 HadError = true; 3511 } 3512 } else if (First) { 3513 // We set the declaration to have the computed exception spec here. 3514 // We duplicate the one parameter type. 3515 EPI.ExtInfo = CtorType->getExtInfo(); 3516 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3517 } 3518 3519 if (HadError) { 3520 CD->setInvalidDecl(); 3521 return; 3522 } 3523 3524 if (ShouldDeleteMoveConstructor(CD)) { 3525 if (First) { 3526 CD->setDeletedAsWritten(); 3527 } else { 3528 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3529 << CXXMoveConstructor; 3530 CD->setInvalidDecl(); 3531 } 3532 } 3533} 3534 3535void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3536 assert(MD->isExplicitlyDefaulted()); 3537 3538 // Whether this was the first-declared instance of the operator 3539 bool First = MD == MD->getCanonicalDecl(); 3540 3541 bool HadError = false; 3542 if (MD->getNumParams() != 1) { 3543 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3544 << MD->getSourceRange(); 3545 HadError = true; 3546 } 3547 3548 QualType ReturnType = 3549 MD->getType()->getAs<FunctionType>()->getResultType(); 3550 if (!ReturnType->isLValueReferenceType() || 3551 !Context.hasSameType( 3552 Context.getCanonicalType(ReturnType->getPointeeType()), 3553 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3554 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3555 HadError = true; 3556 } 3557 3558 ImplicitExceptionSpecification Spec( 3559 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3560 3561 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3562 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3563 *ExceptionType = Context.getFunctionType( 3564 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3565 3566 QualType ArgType = OperType->getArgType(0); 3567 if (!ArgType->isRValueReferenceType()) { 3568 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3569 HadError = true; 3570 } else { 3571 if (ArgType->getPointeeType().isVolatileQualified()) { 3572 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 3573 HadError = true; 3574 } 3575 if (ArgType->getPointeeType().isConstQualified()) { 3576 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 3577 HadError = true; 3578 } 3579 } 3580 3581 if (OperType->getTypeQuals()) { 3582 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 3583 HadError = true; 3584 } 3585 3586 if (OperType->hasExceptionSpec()) { 3587 if (CheckEquivalentExceptionSpec( 3588 PDiag(diag::err_incorrect_defaulted_exception_spec) 3589 << CXXMoveAssignment, 3590 PDiag(), 3591 ExceptionType, SourceLocation(), 3592 OperType, MD->getLocation())) { 3593 HadError = true; 3594 } 3595 } else if (First) { 3596 // We set the declaration to have the computed exception spec here. 3597 // We duplicate the one parameter type. 3598 EPI.RefQualifier = OperType->getRefQualifier(); 3599 EPI.ExtInfo = OperType->getExtInfo(); 3600 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3601 } 3602 3603 if (HadError) { 3604 MD->setInvalidDecl(); 3605 return; 3606 } 3607 3608 if (ShouldDeleteMoveAssignmentOperator(MD)) { 3609 if (First) { 3610 MD->setDeletedAsWritten(); 3611 } else { 3612 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3613 << CXXMoveAssignment; 3614 MD->setInvalidDecl(); 3615 } 3616 } 3617} 3618 3619void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3620 assert(DD->isExplicitlyDefaulted()); 3621 3622 // Whether this was the first-declared instance of the destructor. 3623 bool First = DD == DD->getCanonicalDecl(); 3624 3625 ImplicitExceptionSpecification Spec 3626 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3627 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3628 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3629 *ExceptionType = Context.getFunctionType( 3630 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3631 3632 if (DtorType->hasExceptionSpec()) { 3633 if (CheckEquivalentExceptionSpec( 3634 PDiag(diag::err_incorrect_defaulted_exception_spec) 3635 << CXXDestructor, 3636 PDiag(), 3637 ExceptionType, SourceLocation(), 3638 DtorType, DD->getLocation())) { 3639 DD->setInvalidDecl(); 3640 return; 3641 } 3642 } else if (First) { 3643 // We set the declaration to have the computed exception spec here. 3644 // There are no parameters. 3645 EPI.ExtInfo = DtorType->getExtInfo(); 3646 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3647 } 3648 3649 if (ShouldDeleteDestructor(DD)) { 3650 if (First) { 3651 DD->setDeletedAsWritten(); 3652 } else { 3653 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3654 << CXXDestructor; 3655 DD->setInvalidDecl(); 3656 } 3657 } 3658} 3659 3660bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3661 CXXRecordDecl *RD = CD->getParent(); 3662 assert(!RD->isDependentType() && "do deletion after instantiation"); 3663 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3664 return false; 3665 3666 SourceLocation Loc = CD->getLocation(); 3667 3668 // Do access control from the constructor 3669 ContextRAII CtorContext(*this, CD); 3670 3671 bool Union = RD->isUnion(); 3672 bool AllConst = true; 3673 3674 // We do this because we should never actually use an anonymous 3675 // union's constructor. 3676 if (Union && RD->isAnonymousStructOrUnion()) 3677 return false; 3678 3679 // FIXME: We should put some diagnostic logic right into this function. 3680 3681 // C++0x [class.ctor]/5 3682 // A defaulted default constructor for class X is defined as deleted if: 3683 3684 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3685 BE = RD->bases_end(); 3686 BI != BE; ++BI) { 3687 // We'll handle this one later 3688 if (BI->isVirtual()) 3689 continue; 3690 3691 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3692 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3693 3694 // -- any [direct base class] has a type with a destructor that is 3695 // deleted or inaccessible from the defaulted default constructor 3696 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3697 if (BaseDtor->isDeleted()) 3698 return true; 3699 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3700 AR_accessible) 3701 return true; 3702 3703 // -- any [direct base class either] has no default constructor or 3704 // overload resolution as applied to [its] default constructor 3705 // results in an ambiguity or in a function that is deleted or 3706 // inaccessible from the defaulted default constructor 3707 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3708 if (!BaseDefault || BaseDefault->isDeleted()) 3709 return true; 3710 3711 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3712 PDiag()) != AR_accessible) 3713 return true; 3714 } 3715 3716 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3717 BE = RD->vbases_end(); 3718 BI != BE; ++BI) { 3719 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3720 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3721 3722 // -- any [virtual base class] has a type with a destructor that is 3723 // delete or inaccessible from the defaulted default constructor 3724 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3725 if (BaseDtor->isDeleted()) 3726 return true; 3727 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3728 AR_accessible) 3729 return true; 3730 3731 // -- any [virtual base class either] has no default constructor or 3732 // overload resolution as applied to [its] default constructor 3733 // results in an ambiguity or in a function that is deleted or 3734 // inaccessible from the defaulted default constructor 3735 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3736 if (!BaseDefault || BaseDefault->isDeleted()) 3737 return true; 3738 3739 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3740 PDiag()) != AR_accessible) 3741 return true; 3742 } 3743 3744 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3745 FE = RD->field_end(); 3746 FI != FE; ++FI) { 3747 if (FI->isInvalidDecl()) 3748 continue; 3749 3750 QualType FieldType = Context.getBaseElementType(FI->getType()); 3751 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3752 3753 // -- any non-static data member with no brace-or-equal-initializer is of 3754 // reference type 3755 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3756 return true; 3757 3758 // -- X is a union and all its variant members are of const-qualified type 3759 // (or array thereof) 3760 if (Union && !FieldType.isConstQualified()) 3761 AllConst = false; 3762 3763 if (FieldRecord) { 3764 // -- X is a union-like class that has a variant member with a non-trivial 3765 // default constructor 3766 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3767 return true; 3768 3769 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3770 if (FieldDtor->isDeleted()) 3771 return true; 3772 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3773 AR_accessible) 3774 return true; 3775 3776 // -- any non-variant non-static data member of const-qualified type (or 3777 // array thereof) with no brace-or-equal-initializer does not have a 3778 // user-provided default constructor 3779 if (FieldType.isConstQualified() && 3780 !FI->hasInClassInitializer() && 3781 !FieldRecord->hasUserProvidedDefaultConstructor()) 3782 return true; 3783 3784 if (!Union && FieldRecord->isUnion() && 3785 FieldRecord->isAnonymousStructOrUnion()) { 3786 // We're okay to reuse AllConst here since we only care about the 3787 // value otherwise if we're in a union. 3788 AllConst = true; 3789 3790 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3791 UE = FieldRecord->field_end(); 3792 UI != UE; ++UI) { 3793 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3794 CXXRecordDecl *UnionFieldRecord = 3795 UnionFieldType->getAsCXXRecordDecl(); 3796 3797 if (!UnionFieldType.isConstQualified()) 3798 AllConst = false; 3799 3800 if (UnionFieldRecord && 3801 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3802 return true; 3803 } 3804 3805 if (AllConst) 3806 return true; 3807 3808 // Don't try to initialize the anonymous union 3809 // This is technically non-conformant, but sanity demands it. 3810 continue; 3811 } 3812 3813 // -- any non-static data member with no brace-or-equal-initializer has 3814 // class type M (or array thereof) and either M has no default 3815 // constructor or overload resolution as applied to M's default 3816 // constructor results in an ambiguity or in a function that is deleted 3817 // or inaccessible from the defaulted default constructor. 3818 if (!FI->hasInClassInitializer()) { 3819 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3820 if (!FieldDefault || FieldDefault->isDeleted()) 3821 return true; 3822 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3823 PDiag()) != AR_accessible) 3824 return true; 3825 } 3826 } else if (!Union && FieldType.isConstQualified() && 3827 !FI->hasInClassInitializer()) { 3828 // -- any non-variant non-static data member of const-qualified type (or 3829 // array thereof) with no brace-or-equal-initializer does not have a 3830 // user-provided default constructor 3831 return true; 3832 } 3833 } 3834 3835 if (Union && AllConst) 3836 return true; 3837 3838 return false; 3839} 3840 3841bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3842 CXXRecordDecl *RD = CD->getParent(); 3843 assert(!RD->isDependentType() && "do deletion after instantiation"); 3844 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3845 return false; 3846 3847 SourceLocation Loc = CD->getLocation(); 3848 3849 // Do access control from the constructor 3850 ContextRAII CtorContext(*this, CD); 3851 3852 bool Union = RD->isUnion(); 3853 3854 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3855 "copy assignment arg has no pointee type"); 3856 unsigned ArgQuals = 3857 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3858 Qualifiers::Const : 0; 3859 3860 // We do this because we should never actually use an anonymous 3861 // union's constructor. 3862 if (Union && RD->isAnonymousStructOrUnion()) 3863 return false; 3864 3865 // FIXME: We should put some diagnostic logic right into this function. 3866 3867 // C++0x [class.copy]/11 3868 // A defaulted [copy] constructor for class X is defined as delete if X has: 3869 3870 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3871 BE = RD->bases_end(); 3872 BI != BE; ++BI) { 3873 // We'll handle this one later 3874 if (BI->isVirtual()) 3875 continue; 3876 3877 QualType BaseType = BI->getType(); 3878 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3879 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3880 3881 // -- any [direct base class] of a type with a destructor that is deleted or 3882 // inaccessible from the defaulted constructor 3883 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3884 if (BaseDtor->isDeleted()) 3885 return true; 3886 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3887 AR_accessible) 3888 return true; 3889 3890 // -- a [direct base class] B that cannot be [copied] because overload 3891 // resolution, as applied to B's [copy] constructor, results in an 3892 // ambiguity or a function that is deleted or inaccessible from the 3893 // defaulted constructor 3894 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3895 if (!BaseCtor || BaseCtor->isDeleted()) 3896 return true; 3897 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3898 AR_accessible) 3899 return true; 3900 } 3901 3902 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3903 BE = RD->vbases_end(); 3904 BI != BE; ++BI) { 3905 QualType BaseType = BI->getType(); 3906 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3907 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3908 3909 // -- any [virtual base class] of a type with a destructor that is deleted or 3910 // inaccessible from the defaulted constructor 3911 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3912 if (BaseDtor->isDeleted()) 3913 return true; 3914 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3915 AR_accessible) 3916 return true; 3917 3918 // -- a [virtual base class] B that cannot be [copied] because overload 3919 // resolution, as applied to B's [copy] constructor, results in an 3920 // ambiguity or a function that is deleted or inaccessible from the 3921 // defaulted constructor 3922 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3923 if (!BaseCtor || BaseCtor->isDeleted()) 3924 return true; 3925 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3926 AR_accessible) 3927 return true; 3928 } 3929 3930 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3931 FE = RD->field_end(); 3932 FI != FE; ++FI) { 3933 QualType FieldType = Context.getBaseElementType(FI->getType()); 3934 3935 // -- for a copy constructor, a non-static data member of rvalue reference 3936 // type 3937 if (FieldType->isRValueReferenceType()) 3938 return true; 3939 3940 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3941 3942 if (FieldRecord) { 3943 // This is an anonymous union 3944 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3945 // Anonymous unions inside unions do not variant members create 3946 if (!Union) { 3947 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3948 UE = FieldRecord->field_end(); 3949 UI != UE; ++UI) { 3950 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3951 CXXRecordDecl *UnionFieldRecord = 3952 UnionFieldType->getAsCXXRecordDecl(); 3953 3954 // -- a variant member with a non-trivial [copy] constructor and X 3955 // is a union-like class 3956 if (UnionFieldRecord && 3957 !UnionFieldRecord->hasTrivialCopyConstructor()) 3958 return true; 3959 } 3960 } 3961 3962 // Don't try to initalize an anonymous union 3963 continue; 3964 } else { 3965 // -- a variant member with a non-trivial [copy] constructor and X is a 3966 // union-like class 3967 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3968 return true; 3969 3970 // -- any [non-static data member] of a type with a destructor that is 3971 // deleted or inaccessible from the defaulted constructor 3972 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3973 if (FieldDtor->isDeleted()) 3974 return true; 3975 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3976 AR_accessible) 3977 return true; 3978 } 3979 3980 // -- a [non-static data member of class type (or array thereof)] B that 3981 // cannot be [copied] because overload resolution, as applied to B's 3982 // [copy] constructor, results in an ambiguity or a function that is 3983 // deleted or inaccessible from the defaulted constructor 3984 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3985 ArgQuals); 3986 if (!FieldCtor || FieldCtor->isDeleted()) 3987 return true; 3988 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3989 PDiag()) != AR_accessible) 3990 return true; 3991 } 3992 } 3993 3994 return false; 3995} 3996 3997bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3998 CXXRecordDecl *RD = MD->getParent(); 3999 assert(!RD->isDependentType() && "do deletion after instantiation"); 4000 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4001 return false; 4002 4003 SourceLocation Loc = MD->getLocation(); 4004 4005 // Do access control from the constructor 4006 ContextRAII MethodContext(*this, MD); 4007 4008 bool Union = RD->isUnion(); 4009 4010 unsigned ArgQuals = 4011 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4012 Qualifiers::Const : 0; 4013 4014 // We do this because we should never actually use an anonymous 4015 // union's constructor. 4016 if (Union && RD->isAnonymousStructOrUnion()) 4017 return false; 4018 4019 // FIXME: We should put some diagnostic logic right into this function. 4020 4021 // C++0x [class.copy]/20 4022 // A defaulted [copy] assignment operator for class X is defined as deleted 4023 // if X has: 4024 4025 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4026 BE = RD->bases_end(); 4027 BI != BE; ++BI) { 4028 // We'll handle this one later 4029 if (BI->isVirtual()) 4030 continue; 4031 4032 QualType BaseType = BI->getType(); 4033 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4034 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4035 4036 // -- a [direct base class] B that cannot be [copied] because overload 4037 // resolution, as applied to B's [copy] assignment operator, results in 4038 // an ambiguity or a function that is deleted or inaccessible from the 4039 // assignment operator 4040 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4041 0); 4042 if (!CopyOper || CopyOper->isDeleted()) 4043 return true; 4044 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4045 return true; 4046 } 4047 4048 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4049 BE = RD->vbases_end(); 4050 BI != BE; ++BI) { 4051 QualType BaseType = BI->getType(); 4052 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4053 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4054 4055 // -- a [virtual base class] B that cannot be [copied] because overload 4056 // resolution, as applied to B's [copy] assignment operator, results in 4057 // an ambiguity or a function that is deleted or inaccessible from the 4058 // assignment operator 4059 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4060 0); 4061 if (!CopyOper || CopyOper->isDeleted()) 4062 return true; 4063 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4064 return true; 4065 } 4066 4067 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4068 FE = RD->field_end(); 4069 FI != FE; ++FI) { 4070 QualType FieldType = Context.getBaseElementType(FI->getType()); 4071 4072 // -- a non-static data member of reference type 4073 if (FieldType->isReferenceType()) 4074 return true; 4075 4076 // -- a non-static data member of const non-class type (or array thereof) 4077 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4078 return true; 4079 4080 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4081 4082 if (FieldRecord) { 4083 // This is an anonymous union 4084 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4085 // Anonymous unions inside unions do not variant members create 4086 if (!Union) { 4087 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4088 UE = FieldRecord->field_end(); 4089 UI != UE; ++UI) { 4090 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4091 CXXRecordDecl *UnionFieldRecord = 4092 UnionFieldType->getAsCXXRecordDecl(); 4093 4094 // -- a variant member with a non-trivial [copy] assignment operator 4095 // and X is a union-like class 4096 if (UnionFieldRecord && 4097 !UnionFieldRecord->hasTrivialCopyAssignment()) 4098 return true; 4099 } 4100 } 4101 4102 // Don't try to initalize an anonymous union 4103 continue; 4104 // -- a variant member with a non-trivial [copy] assignment operator 4105 // and X is a union-like class 4106 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4107 return true; 4108 } 4109 4110 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4111 false, 0); 4112 if (!CopyOper || CopyOper->isDeleted()) 4113 return true; 4114 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4115 return true; 4116 } 4117 } 4118 4119 return false; 4120} 4121 4122bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4123 CXXRecordDecl *RD = CD->getParent(); 4124 assert(!RD->isDependentType() && "do deletion after instantiation"); 4125 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4126 return false; 4127 4128 SourceLocation Loc = CD->getLocation(); 4129 4130 // Do access control from the constructor 4131 ContextRAII CtorContext(*this, CD); 4132 4133 bool Union = RD->isUnion(); 4134 4135 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4136 "copy assignment arg has no pointee type"); 4137 4138 // We do this because we should never actually use an anonymous 4139 // union's constructor. 4140 if (Union && RD->isAnonymousStructOrUnion()) 4141 return false; 4142 4143 // C++0x [class.copy]/11 4144 // A defaulted [move] constructor for class X is defined as deleted 4145 // if X has: 4146 4147 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4148 BE = RD->bases_end(); 4149 BI != BE; ++BI) { 4150 // We'll handle this one later 4151 if (BI->isVirtual()) 4152 continue; 4153 4154 QualType BaseType = BI->getType(); 4155 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4156 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4157 4158 // -- any [direct base class] of a type with a destructor that is deleted or 4159 // inaccessible from the defaulted constructor 4160 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4161 if (BaseDtor->isDeleted()) 4162 return true; 4163 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4164 AR_accessible) 4165 return true; 4166 4167 // -- a [direct base class] B that cannot be [moved] because overload 4168 // resolution, as applied to B's [move] constructor, results in an 4169 // ambiguity or a function that is deleted or inaccessible from the 4170 // defaulted constructor 4171 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4172 if (!BaseCtor || BaseCtor->isDeleted()) 4173 return true; 4174 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4175 AR_accessible) 4176 return true; 4177 4178 // -- for a move constructor, a [direct base class] with a type that 4179 // does not have a move constructor and is not trivially copyable. 4180 // If the field isn't a record, it's always trivially copyable. 4181 // A moving constructor could be a copy constructor instead. 4182 if (!BaseCtor->isMoveConstructor() && 4183 !BaseDecl->isTriviallyCopyable()) 4184 return true; 4185 } 4186 4187 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4188 BE = RD->vbases_end(); 4189 BI != BE; ++BI) { 4190 QualType BaseType = BI->getType(); 4191 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4192 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4193 4194 // -- any [virtual base class] of a type with a destructor that is deleted 4195 // or inaccessible from the defaulted constructor 4196 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4197 if (BaseDtor->isDeleted()) 4198 return true; 4199 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4200 AR_accessible) 4201 return true; 4202 4203 // -- a [virtual base class] B that cannot be [moved] because overload 4204 // resolution, as applied to B's [move] constructor, results in an 4205 // ambiguity or a function that is deleted or inaccessible from the 4206 // defaulted constructor 4207 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4208 if (!BaseCtor || BaseCtor->isDeleted()) 4209 return true; 4210 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4211 AR_accessible) 4212 return true; 4213 4214 // -- for a move constructor, a [virtual base class] with a type that 4215 // does not have a move constructor and is not trivially copyable. 4216 // If the field isn't a record, it's always trivially copyable. 4217 // A moving constructor could be a copy constructor instead. 4218 if (!BaseCtor->isMoveConstructor() && 4219 !BaseDecl->isTriviallyCopyable()) 4220 return true; 4221 } 4222 4223 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4224 FE = RD->field_end(); 4225 FI != FE; ++FI) { 4226 QualType FieldType = Context.getBaseElementType(FI->getType()); 4227 4228 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4229 // This is an anonymous union 4230 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4231 // Anonymous unions inside unions do not variant members create 4232 if (!Union) { 4233 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4234 UE = FieldRecord->field_end(); 4235 UI != UE; ++UI) { 4236 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4237 CXXRecordDecl *UnionFieldRecord = 4238 UnionFieldType->getAsCXXRecordDecl(); 4239 4240 // -- a variant member with a non-trivial [move] constructor and X 4241 // is a union-like class 4242 if (UnionFieldRecord && 4243 !UnionFieldRecord->hasTrivialMoveConstructor()) 4244 return true; 4245 } 4246 } 4247 4248 // Don't try to initalize an anonymous union 4249 continue; 4250 } else { 4251 // -- a variant member with a non-trivial [move] constructor and X is a 4252 // union-like class 4253 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4254 return true; 4255 4256 // -- any [non-static data member] of a type with a destructor that is 4257 // deleted or inaccessible from the defaulted constructor 4258 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4259 if (FieldDtor->isDeleted()) 4260 return true; 4261 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4262 AR_accessible) 4263 return true; 4264 } 4265 4266 // -- a [non-static data member of class type (or array thereof)] B that 4267 // cannot be [moved] because overload resolution, as applied to B's 4268 // [move] constructor, results in an ambiguity or a function that is 4269 // deleted or inaccessible from the defaulted constructor 4270 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4271 if (!FieldCtor || FieldCtor->isDeleted()) 4272 return true; 4273 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4274 PDiag()) != AR_accessible) 4275 return true; 4276 4277 // -- for a move constructor, a [non-static data member] with a type that 4278 // does not have a move constructor and is not trivially copyable. 4279 // If the field isn't a record, it's always trivially copyable. 4280 // A moving constructor could be a copy constructor instead. 4281 if (!FieldCtor->isMoveConstructor() && 4282 !FieldRecord->isTriviallyCopyable()) 4283 return true; 4284 } 4285 } 4286 4287 return false; 4288} 4289 4290bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4291 CXXRecordDecl *RD = MD->getParent(); 4292 assert(!RD->isDependentType() && "do deletion after instantiation"); 4293 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4294 return false; 4295 4296 SourceLocation Loc = MD->getLocation(); 4297 4298 // Do access control from the constructor 4299 ContextRAII MethodContext(*this, MD); 4300 4301 bool Union = RD->isUnion(); 4302 4303 // We do this because we should never actually use an anonymous 4304 // union's constructor. 4305 if (Union && RD->isAnonymousStructOrUnion()) 4306 return false; 4307 4308 // C++0x [class.copy]/20 4309 // A defaulted [move] assignment operator for class X is defined as deleted 4310 // if X has: 4311 4312 // -- for the move constructor, [...] any direct or indirect virtual base 4313 // class. 4314 if (RD->getNumVBases() != 0) 4315 return true; 4316 4317 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4318 BE = RD->bases_end(); 4319 BI != BE; ++BI) { 4320 4321 QualType BaseType = BI->getType(); 4322 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4323 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4324 4325 // -- a [direct base class] B that cannot be [moved] because overload 4326 // resolution, as applied to B's [move] assignment operator, results in 4327 // an ambiguity or a function that is deleted or inaccessible from the 4328 // assignment operator 4329 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4330 if (!MoveOper || MoveOper->isDeleted()) 4331 return true; 4332 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4333 return true; 4334 4335 // -- for the move assignment operator, a [direct base class] with a type 4336 // that does not have a move assignment operator and is not trivially 4337 // copyable. 4338 if (!MoveOper->isMoveAssignmentOperator() && 4339 !BaseDecl->isTriviallyCopyable()) 4340 return true; 4341 } 4342 4343 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4344 FE = RD->field_end(); 4345 FI != FE; ++FI) { 4346 QualType FieldType = Context.getBaseElementType(FI->getType()); 4347 4348 // -- a non-static data member of reference type 4349 if (FieldType->isReferenceType()) 4350 return true; 4351 4352 // -- a non-static data member of const non-class type (or array thereof) 4353 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4354 return true; 4355 4356 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4357 4358 if (FieldRecord) { 4359 // This is an anonymous union 4360 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4361 // Anonymous unions inside unions do not variant members create 4362 if (!Union) { 4363 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4364 UE = FieldRecord->field_end(); 4365 UI != UE; ++UI) { 4366 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4367 CXXRecordDecl *UnionFieldRecord = 4368 UnionFieldType->getAsCXXRecordDecl(); 4369 4370 // -- a variant member with a non-trivial [move] assignment operator 4371 // and X is a union-like class 4372 if (UnionFieldRecord && 4373 !UnionFieldRecord->hasTrivialMoveAssignment()) 4374 return true; 4375 } 4376 } 4377 4378 // Don't try to initalize an anonymous union 4379 continue; 4380 // -- a variant member with a non-trivial [move] assignment operator 4381 // and X is a union-like class 4382 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4383 return true; 4384 } 4385 4386 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4387 if (!MoveOper || MoveOper->isDeleted()) 4388 return true; 4389 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4390 return true; 4391 4392 // -- for the move assignment operator, a [non-static data member] with a 4393 // type that does not have a move assignment operator and is not 4394 // trivially copyable. 4395 if (!MoveOper->isMoveAssignmentOperator() && 4396 !FieldRecord->isTriviallyCopyable()) 4397 return true; 4398 } 4399 } 4400 4401 return false; 4402} 4403 4404bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4405 CXXRecordDecl *RD = DD->getParent(); 4406 assert(!RD->isDependentType() && "do deletion after instantiation"); 4407 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4408 return false; 4409 4410 SourceLocation Loc = DD->getLocation(); 4411 4412 // Do access control from the destructor 4413 ContextRAII CtorContext(*this, DD); 4414 4415 bool Union = RD->isUnion(); 4416 4417 // We do this because we should never actually use an anonymous 4418 // union's destructor. 4419 if (Union && RD->isAnonymousStructOrUnion()) 4420 return false; 4421 4422 // C++0x [class.dtor]p5 4423 // A defaulted destructor for a class X is defined as deleted if: 4424 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4425 BE = RD->bases_end(); 4426 BI != BE; ++BI) { 4427 // We'll handle this one later 4428 if (BI->isVirtual()) 4429 continue; 4430 4431 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4432 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4433 assert(BaseDtor && "base has no destructor"); 4434 4435 // -- any direct or virtual base class has a deleted destructor or 4436 // a destructor that is inaccessible from the defaulted destructor 4437 if (BaseDtor->isDeleted()) 4438 return true; 4439 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4440 AR_accessible) 4441 return true; 4442 } 4443 4444 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4445 BE = RD->vbases_end(); 4446 BI != BE; ++BI) { 4447 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4448 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4449 assert(BaseDtor && "base has no destructor"); 4450 4451 // -- any direct or virtual base class has a deleted destructor or 4452 // a destructor that is inaccessible from the defaulted destructor 4453 if (BaseDtor->isDeleted()) 4454 return true; 4455 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4456 AR_accessible) 4457 return true; 4458 } 4459 4460 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4461 FE = RD->field_end(); 4462 FI != FE; ++FI) { 4463 QualType FieldType = Context.getBaseElementType(FI->getType()); 4464 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4465 if (FieldRecord) { 4466 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4467 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4468 UE = FieldRecord->field_end(); 4469 UI != UE; ++UI) { 4470 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4471 CXXRecordDecl *UnionFieldRecord = 4472 UnionFieldType->getAsCXXRecordDecl(); 4473 4474 // -- X is a union-like class that has a variant member with a non- 4475 // trivial destructor. 4476 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4477 return true; 4478 } 4479 // Technically we are supposed to do this next check unconditionally. 4480 // But that makes absolutely no sense. 4481 } else { 4482 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4483 4484 // -- any of the non-static data members has class type M (or array 4485 // thereof) and M has a deleted destructor or a destructor that is 4486 // inaccessible from the defaulted destructor 4487 if (FieldDtor->isDeleted()) 4488 return true; 4489 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4490 AR_accessible) 4491 return true; 4492 4493 // -- X is a union-like class that has a variant member with a non- 4494 // trivial destructor. 4495 if (Union && !FieldDtor->isTrivial()) 4496 return true; 4497 } 4498 } 4499 } 4500 4501 if (DD->isVirtual()) { 4502 FunctionDecl *OperatorDelete = 0; 4503 DeclarationName Name = 4504 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4505 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4506 false)) 4507 return true; 4508 } 4509 4510 4511 return false; 4512} 4513 4514/// \brief Data used with FindHiddenVirtualMethod 4515namespace { 4516 struct FindHiddenVirtualMethodData { 4517 Sema *S; 4518 CXXMethodDecl *Method; 4519 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4520 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4521 }; 4522} 4523 4524/// \brief Member lookup function that determines whether a given C++ 4525/// method overloads virtual methods in a base class without overriding any, 4526/// to be used with CXXRecordDecl::lookupInBases(). 4527static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4528 CXXBasePath &Path, 4529 void *UserData) { 4530 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4531 4532 FindHiddenVirtualMethodData &Data 4533 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4534 4535 DeclarationName Name = Data.Method->getDeclName(); 4536 assert(Name.getNameKind() == DeclarationName::Identifier); 4537 4538 bool foundSameNameMethod = false; 4539 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4540 for (Path.Decls = BaseRecord->lookup(Name); 4541 Path.Decls.first != Path.Decls.second; 4542 ++Path.Decls.first) { 4543 NamedDecl *D = *Path.Decls.first; 4544 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4545 MD = MD->getCanonicalDecl(); 4546 foundSameNameMethod = true; 4547 // Interested only in hidden virtual methods. 4548 if (!MD->isVirtual()) 4549 continue; 4550 // If the method we are checking overrides a method from its base 4551 // don't warn about the other overloaded methods. 4552 if (!Data.S->IsOverload(Data.Method, MD, false)) 4553 return true; 4554 // Collect the overload only if its hidden. 4555 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4556 overloadedMethods.push_back(MD); 4557 } 4558 } 4559 4560 if (foundSameNameMethod) 4561 Data.OverloadedMethods.append(overloadedMethods.begin(), 4562 overloadedMethods.end()); 4563 return foundSameNameMethod; 4564} 4565 4566/// \brief See if a method overloads virtual methods in a base class without 4567/// overriding any. 4568void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4569 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4570 MD->getLocation()) == Diagnostic::Ignored) 4571 return; 4572 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4573 return; 4574 4575 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4576 /*bool RecordPaths=*/false, 4577 /*bool DetectVirtual=*/false); 4578 FindHiddenVirtualMethodData Data; 4579 Data.Method = MD; 4580 Data.S = this; 4581 4582 // Keep the base methods that were overriden or introduced in the subclass 4583 // by 'using' in a set. A base method not in this set is hidden. 4584 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4585 res.first != res.second; ++res.first) { 4586 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4587 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4588 E = MD->end_overridden_methods(); 4589 I != E; ++I) 4590 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4591 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4592 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4593 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4594 } 4595 4596 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4597 !Data.OverloadedMethods.empty()) { 4598 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4599 << MD << (Data.OverloadedMethods.size() > 1); 4600 4601 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4602 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4603 Diag(overloadedMD->getLocation(), 4604 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4605 } 4606 } 4607} 4608 4609void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4610 Decl *TagDecl, 4611 SourceLocation LBrac, 4612 SourceLocation RBrac, 4613 AttributeList *AttrList) { 4614 if (!TagDecl) 4615 return; 4616 4617 AdjustDeclIfTemplate(TagDecl); 4618 4619 ActOnFields(S, RLoc, TagDecl, 4620 // strict aliasing violation! 4621 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4622 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4623 4624 CheckCompletedCXXClass( 4625 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4626} 4627 4628/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4629/// special functions, such as the default constructor, copy 4630/// constructor, or destructor, to the given C++ class (C++ 4631/// [special]p1). This routine can only be executed just before the 4632/// definition of the class is complete. 4633void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4634 if (!ClassDecl->hasUserDeclaredConstructor()) 4635 ++ASTContext::NumImplicitDefaultConstructors; 4636 4637 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4638 ++ASTContext::NumImplicitCopyConstructors; 4639 4640 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4641 ++ASTContext::NumImplicitCopyAssignmentOperators; 4642 4643 // If we have a dynamic class, then the copy assignment operator may be 4644 // virtual, so we have to declare it immediately. This ensures that, e.g., 4645 // it shows up in the right place in the vtable and that we diagnose 4646 // problems with the implicit exception specification. 4647 if (ClassDecl->isDynamicClass()) 4648 DeclareImplicitCopyAssignment(ClassDecl); 4649 } 4650 4651 if (!ClassDecl->hasUserDeclaredDestructor()) { 4652 ++ASTContext::NumImplicitDestructors; 4653 4654 // If we have a dynamic class, then the destructor may be virtual, so we 4655 // have to declare the destructor immediately. This ensures that, e.g., it 4656 // shows up in the right place in the vtable and that we diagnose problems 4657 // with the implicit exception specification. 4658 if (ClassDecl->isDynamicClass()) 4659 DeclareImplicitDestructor(ClassDecl); 4660 } 4661} 4662 4663void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4664 if (!D) 4665 return; 4666 4667 int NumParamList = D->getNumTemplateParameterLists(); 4668 for (int i = 0; i < NumParamList; i++) { 4669 TemplateParameterList* Params = D->getTemplateParameterList(i); 4670 for (TemplateParameterList::iterator Param = Params->begin(), 4671 ParamEnd = Params->end(); 4672 Param != ParamEnd; ++Param) { 4673 NamedDecl *Named = cast<NamedDecl>(*Param); 4674 if (Named->getDeclName()) { 4675 S->AddDecl(Named); 4676 IdResolver.AddDecl(Named); 4677 } 4678 } 4679 } 4680} 4681 4682void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4683 if (!D) 4684 return; 4685 4686 TemplateParameterList *Params = 0; 4687 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4688 Params = Template->getTemplateParameters(); 4689 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4690 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4691 Params = PartialSpec->getTemplateParameters(); 4692 else 4693 return; 4694 4695 for (TemplateParameterList::iterator Param = Params->begin(), 4696 ParamEnd = Params->end(); 4697 Param != ParamEnd; ++Param) { 4698 NamedDecl *Named = cast<NamedDecl>(*Param); 4699 if (Named->getDeclName()) { 4700 S->AddDecl(Named); 4701 IdResolver.AddDecl(Named); 4702 } 4703 } 4704} 4705 4706void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4707 if (!RecordD) return; 4708 AdjustDeclIfTemplate(RecordD); 4709 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4710 PushDeclContext(S, Record); 4711} 4712 4713void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4714 if (!RecordD) return; 4715 PopDeclContext(); 4716} 4717 4718/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4719/// parsing a top-level (non-nested) C++ class, and we are now 4720/// parsing those parts of the given Method declaration that could 4721/// not be parsed earlier (C++ [class.mem]p2), such as default 4722/// arguments. This action should enter the scope of the given 4723/// Method declaration as if we had just parsed the qualified method 4724/// name. However, it should not bring the parameters into scope; 4725/// that will be performed by ActOnDelayedCXXMethodParameter. 4726void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4727} 4728 4729/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4730/// C++ method declaration. We're (re-)introducing the given 4731/// function parameter into scope for use in parsing later parts of 4732/// the method declaration. For example, we could see an 4733/// ActOnParamDefaultArgument event for this parameter. 4734void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4735 if (!ParamD) 4736 return; 4737 4738 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4739 4740 // If this parameter has an unparsed default argument, clear it out 4741 // to make way for the parsed default argument. 4742 if (Param->hasUnparsedDefaultArg()) 4743 Param->setDefaultArg(0); 4744 4745 S->AddDecl(Param); 4746 if (Param->getDeclName()) 4747 IdResolver.AddDecl(Param); 4748} 4749 4750/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4751/// processing the delayed method declaration for Method. The method 4752/// declaration is now considered finished. There may be a separate 4753/// ActOnStartOfFunctionDef action later (not necessarily 4754/// immediately!) for this method, if it was also defined inside the 4755/// class body. 4756void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4757 if (!MethodD) 4758 return; 4759 4760 AdjustDeclIfTemplate(MethodD); 4761 4762 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4763 4764 // Now that we have our default arguments, check the constructor 4765 // again. It could produce additional diagnostics or affect whether 4766 // the class has implicitly-declared destructors, among other 4767 // things. 4768 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4769 CheckConstructor(Constructor); 4770 4771 // Check the default arguments, which we may have added. 4772 if (!Method->isInvalidDecl()) 4773 CheckCXXDefaultArguments(Method); 4774} 4775 4776/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4777/// the well-formedness of the constructor declarator @p D with type @p 4778/// R. If there are any errors in the declarator, this routine will 4779/// emit diagnostics and set the invalid bit to true. In any case, the type 4780/// will be updated to reflect a well-formed type for the constructor and 4781/// returned. 4782QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4783 StorageClass &SC) { 4784 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4785 4786 // C++ [class.ctor]p3: 4787 // A constructor shall not be virtual (10.3) or static (9.4). A 4788 // constructor can be invoked for a const, volatile or const 4789 // volatile object. A constructor shall not be declared const, 4790 // volatile, or const volatile (9.3.2). 4791 if (isVirtual) { 4792 if (!D.isInvalidType()) 4793 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4794 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4795 << SourceRange(D.getIdentifierLoc()); 4796 D.setInvalidType(); 4797 } 4798 if (SC == SC_Static) { 4799 if (!D.isInvalidType()) 4800 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4801 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4802 << SourceRange(D.getIdentifierLoc()); 4803 D.setInvalidType(); 4804 SC = SC_None; 4805 } 4806 4807 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4808 if (FTI.TypeQuals != 0) { 4809 if (FTI.TypeQuals & Qualifiers::Const) 4810 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4811 << "const" << SourceRange(D.getIdentifierLoc()); 4812 if (FTI.TypeQuals & Qualifiers::Volatile) 4813 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4814 << "volatile" << SourceRange(D.getIdentifierLoc()); 4815 if (FTI.TypeQuals & Qualifiers::Restrict) 4816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4817 << "restrict" << SourceRange(D.getIdentifierLoc()); 4818 D.setInvalidType(); 4819 } 4820 4821 // C++0x [class.ctor]p4: 4822 // A constructor shall not be declared with a ref-qualifier. 4823 if (FTI.hasRefQualifier()) { 4824 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4825 << FTI.RefQualifierIsLValueRef 4826 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4827 D.setInvalidType(); 4828 } 4829 4830 // Rebuild the function type "R" without any type qualifiers (in 4831 // case any of the errors above fired) and with "void" as the 4832 // return type, since constructors don't have return types. 4833 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4834 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4835 return R; 4836 4837 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4838 EPI.TypeQuals = 0; 4839 EPI.RefQualifier = RQ_None; 4840 4841 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4842 Proto->getNumArgs(), EPI); 4843} 4844 4845/// CheckConstructor - Checks a fully-formed constructor for 4846/// well-formedness, issuing any diagnostics required. Returns true if 4847/// the constructor declarator is invalid. 4848void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4849 CXXRecordDecl *ClassDecl 4850 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4851 if (!ClassDecl) 4852 return Constructor->setInvalidDecl(); 4853 4854 // C++ [class.copy]p3: 4855 // A declaration of a constructor for a class X is ill-formed if 4856 // its first parameter is of type (optionally cv-qualified) X and 4857 // either there are no other parameters or else all other 4858 // parameters have default arguments. 4859 if (!Constructor->isInvalidDecl() && 4860 ((Constructor->getNumParams() == 1) || 4861 (Constructor->getNumParams() > 1 && 4862 Constructor->getParamDecl(1)->hasDefaultArg())) && 4863 Constructor->getTemplateSpecializationKind() 4864 != TSK_ImplicitInstantiation) { 4865 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4866 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4867 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4868 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4869 const char *ConstRef 4870 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4871 : " const &"; 4872 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4873 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4874 4875 // FIXME: Rather that making the constructor invalid, we should endeavor 4876 // to fix the type. 4877 Constructor->setInvalidDecl(); 4878 } 4879 } 4880} 4881 4882/// CheckDestructor - Checks a fully-formed destructor definition for 4883/// well-formedness, issuing any diagnostics required. Returns true 4884/// on error. 4885bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4886 CXXRecordDecl *RD = Destructor->getParent(); 4887 4888 if (Destructor->isVirtual()) { 4889 SourceLocation Loc; 4890 4891 if (!Destructor->isImplicit()) 4892 Loc = Destructor->getLocation(); 4893 else 4894 Loc = RD->getLocation(); 4895 4896 // If we have a virtual destructor, look up the deallocation function 4897 FunctionDecl *OperatorDelete = 0; 4898 DeclarationName Name = 4899 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4900 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4901 return true; 4902 4903 MarkDeclarationReferenced(Loc, OperatorDelete); 4904 4905 Destructor->setOperatorDelete(OperatorDelete); 4906 } 4907 4908 return false; 4909} 4910 4911static inline bool 4912FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4913 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4914 FTI.ArgInfo[0].Param && 4915 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4916} 4917 4918/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4919/// the well-formednes of the destructor declarator @p D with type @p 4920/// R. If there are any errors in the declarator, this routine will 4921/// emit diagnostics and set the declarator to invalid. Even if this happens, 4922/// will be updated to reflect a well-formed type for the destructor and 4923/// returned. 4924QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4925 StorageClass& SC) { 4926 // C++ [class.dtor]p1: 4927 // [...] A typedef-name that names a class is a class-name 4928 // (7.1.3); however, a typedef-name that names a class shall not 4929 // be used as the identifier in the declarator for a destructor 4930 // declaration. 4931 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4932 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4933 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4934 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4935 else if (const TemplateSpecializationType *TST = 4936 DeclaratorType->getAs<TemplateSpecializationType>()) 4937 if (TST->isTypeAlias()) 4938 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4939 << DeclaratorType << 1; 4940 4941 // C++ [class.dtor]p2: 4942 // A destructor is used to destroy objects of its class type. A 4943 // destructor takes no parameters, and no return type can be 4944 // specified for it (not even void). The address of a destructor 4945 // shall not be taken. A destructor shall not be static. A 4946 // destructor can be invoked for a const, volatile or const 4947 // volatile object. A destructor shall not be declared const, 4948 // volatile or const volatile (9.3.2). 4949 if (SC == SC_Static) { 4950 if (!D.isInvalidType()) 4951 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4952 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4953 << SourceRange(D.getIdentifierLoc()) 4954 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4955 4956 SC = SC_None; 4957 } 4958 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4959 // Destructors don't have return types, but the parser will 4960 // happily parse something like: 4961 // 4962 // class X { 4963 // float ~X(); 4964 // }; 4965 // 4966 // The return type will be eliminated later. 4967 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4968 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4969 << SourceRange(D.getIdentifierLoc()); 4970 } 4971 4972 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4973 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4974 if (FTI.TypeQuals & Qualifiers::Const) 4975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4976 << "const" << SourceRange(D.getIdentifierLoc()); 4977 if (FTI.TypeQuals & Qualifiers::Volatile) 4978 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4979 << "volatile" << SourceRange(D.getIdentifierLoc()); 4980 if (FTI.TypeQuals & Qualifiers::Restrict) 4981 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4982 << "restrict" << SourceRange(D.getIdentifierLoc()); 4983 D.setInvalidType(); 4984 } 4985 4986 // C++0x [class.dtor]p2: 4987 // A destructor shall not be declared with a ref-qualifier. 4988 if (FTI.hasRefQualifier()) { 4989 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4990 << FTI.RefQualifierIsLValueRef 4991 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4992 D.setInvalidType(); 4993 } 4994 4995 // Make sure we don't have any parameters. 4996 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4997 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4998 4999 // Delete the parameters. 5000 FTI.freeArgs(); 5001 D.setInvalidType(); 5002 } 5003 5004 // Make sure the destructor isn't variadic. 5005 if (FTI.isVariadic) { 5006 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5007 D.setInvalidType(); 5008 } 5009 5010 // Rebuild the function type "R" without any type qualifiers or 5011 // parameters (in case any of the errors above fired) and with 5012 // "void" as the return type, since destructors don't have return 5013 // types. 5014 if (!D.isInvalidType()) 5015 return R; 5016 5017 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5018 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5019 EPI.Variadic = false; 5020 EPI.TypeQuals = 0; 5021 EPI.RefQualifier = RQ_None; 5022 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5023} 5024 5025/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5026/// well-formednes of the conversion function declarator @p D with 5027/// type @p R. If there are any errors in the declarator, this routine 5028/// will emit diagnostics and return true. Otherwise, it will return 5029/// false. Either way, the type @p R will be updated to reflect a 5030/// well-formed type for the conversion operator. 5031void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5032 StorageClass& SC) { 5033 // C++ [class.conv.fct]p1: 5034 // Neither parameter types nor return type can be specified. The 5035 // type of a conversion function (8.3.5) is "function taking no 5036 // parameter returning conversion-type-id." 5037 if (SC == SC_Static) { 5038 if (!D.isInvalidType()) 5039 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5040 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5041 << SourceRange(D.getIdentifierLoc()); 5042 D.setInvalidType(); 5043 SC = SC_None; 5044 } 5045 5046 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5047 5048 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5049 // Conversion functions don't have return types, but the parser will 5050 // happily parse something like: 5051 // 5052 // class X { 5053 // float operator bool(); 5054 // }; 5055 // 5056 // The return type will be changed later anyway. 5057 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5058 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5059 << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 } 5062 5063 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5064 5065 // Make sure we don't have any parameters. 5066 if (Proto->getNumArgs() > 0) { 5067 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5068 5069 // Delete the parameters. 5070 D.getFunctionTypeInfo().freeArgs(); 5071 D.setInvalidType(); 5072 } else if (Proto->isVariadic()) { 5073 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5074 D.setInvalidType(); 5075 } 5076 5077 // Diagnose "&operator bool()" and other such nonsense. This 5078 // is actually a gcc extension which we don't support. 5079 if (Proto->getResultType() != ConvType) { 5080 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5081 << Proto->getResultType(); 5082 D.setInvalidType(); 5083 ConvType = Proto->getResultType(); 5084 } 5085 5086 // C++ [class.conv.fct]p4: 5087 // The conversion-type-id shall not represent a function type nor 5088 // an array type. 5089 if (ConvType->isArrayType()) { 5090 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5091 ConvType = Context.getPointerType(ConvType); 5092 D.setInvalidType(); 5093 } else if (ConvType->isFunctionType()) { 5094 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5095 ConvType = Context.getPointerType(ConvType); 5096 D.setInvalidType(); 5097 } 5098 5099 // Rebuild the function type "R" without any parameters (in case any 5100 // of the errors above fired) and with the conversion type as the 5101 // return type. 5102 if (D.isInvalidType()) 5103 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5104 5105 // C++0x explicit conversion operators. 5106 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5107 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5108 diag::warn_explicit_conversion_functions) 5109 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5110} 5111 5112/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5113/// the declaration of the given C++ conversion function. This routine 5114/// is responsible for recording the conversion function in the C++ 5115/// class, if possible. 5116Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5117 assert(Conversion && "Expected to receive a conversion function declaration"); 5118 5119 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5120 5121 // Make sure we aren't redeclaring the conversion function. 5122 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5123 5124 // C++ [class.conv.fct]p1: 5125 // [...] A conversion function is never used to convert a 5126 // (possibly cv-qualified) object to the (possibly cv-qualified) 5127 // same object type (or a reference to it), to a (possibly 5128 // cv-qualified) base class of that type (or a reference to it), 5129 // or to (possibly cv-qualified) void. 5130 // FIXME: Suppress this warning if the conversion function ends up being a 5131 // virtual function that overrides a virtual function in a base class. 5132 QualType ClassType 5133 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5134 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5135 ConvType = ConvTypeRef->getPointeeType(); 5136 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5137 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5138 /* Suppress diagnostics for instantiations. */; 5139 else if (ConvType->isRecordType()) { 5140 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5141 if (ConvType == ClassType) 5142 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5143 << ClassType; 5144 else if (IsDerivedFrom(ClassType, ConvType)) 5145 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5146 << ClassType << ConvType; 5147 } else if (ConvType->isVoidType()) { 5148 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5149 << ClassType << ConvType; 5150 } 5151 5152 if (FunctionTemplateDecl *ConversionTemplate 5153 = Conversion->getDescribedFunctionTemplate()) 5154 return ConversionTemplate; 5155 5156 return Conversion; 5157} 5158 5159//===----------------------------------------------------------------------===// 5160// Namespace Handling 5161//===----------------------------------------------------------------------===// 5162 5163 5164 5165/// ActOnStartNamespaceDef - This is called at the start of a namespace 5166/// definition. 5167Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5168 SourceLocation InlineLoc, 5169 SourceLocation NamespaceLoc, 5170 SourceLocation IdentLoc, 5171 IdentifierInfo *II, 5172 SourceLocation LBrace, 5173 AttributeList *AttrList) { 5174 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5175 // For anonymous namespace, take the location of the left brace. 5176 SourceLocation Loc = II ? IdentLoc : LBrace; 5177 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5178 StartLoc, Loc, II); 5179 Namespc->setInline(InlineLoc.isValid()); 5180 5181 Scope *DeclRegionScope = NamespcScope->getParent(); 5182 5183 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5184 5185 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5186 PushNamespaceVisibilityAttr(Attr); 5187 5188 if (II) { 5189 // C++ [namespace.def]p2: 5190 // The identifier in an original-namespace-definition shall not 5191 // have been previously defined in the declarative region in 5192 // which the original-namespace-definition appears. The 5193 // identifier in an original-namespace-definition is the name of 5194 // the namespace. Subsequently in that declarative region, it is 5195 // treated as an original-namespace-name. 5196 // 5197 // Since namespace names are unique in their scope, and we don't 5198 // look through using directives, just look for any ordinary names. 5199 5200 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5201 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5202 Decl::IDNS_Namespace; 5203 NamedDecl *PrevDecl = 0; 5204 for (DeclContext::lookup_result R 5205 = CurContext->getRedeclContext()->lookup(II); 5206 R.first != R.second; ++R.first) { 5207 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5208 PrevDecl = *R.first; 5209 break; 5210 } 5211 } 5212 5213 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5214 // This is an extended namespace definition. 5215 if (Namespc->isInline() != OrigNS->isInline()) { 5216 // inline-ness must match 5217 if (OrigNS->isInline()) { 5218 // The user probably just forgot the 'inline', so suggest that it 5219 // be added back. 5220 Diag(Namespc->getLocation(), 5221 diag::warn_inline_namespace_reopened_noninline) 5222 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5223 } else { 5224 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5225 << Namespc->isInline(); 5226 } 5227 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5228 5229 // Recover by ignoring the new namespace's inline status. 5230 Namespc->setInline(OrigNS->isInline()); 5231 } 5232 5233 // Attach this namespace decl to the chain of extended namespace 5234 // definitions. 5235 OrigNS->setNextNamespace(Namespc); 5236 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5237 5238 // Remove the previous declaration from the scope. 5239 if (DeclRegionScope->isDeclScope(OrigNS)) { 5240 IdResolver.RemoveDecl(OrigNS); 5241 DeclRegionScope->RemoveDecl(OrigNS); 5242 } 5243 } else if (PrevDecl) { 5244 // This is an invalid name redefinition. 5245 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5246 << Namespc->getDeclName(); 5247 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5248 Namespc->setInvalidDecl(); 5249 // Continue on to push Namespc as current DeclContext and return it. 5250 } else if (II->isStr("std") && 5251 CurContext->getRedeclContext()->isTranslationUnit()) { 5252 // This is the first "real" definition of the namespace "std", so update 5253 // our cache of the "std" namespace to point at this definition. 5254 if (NamespaceDecl *StdNS = getStdNamespace()) { 5255 // We had already defined a dummy namespace "std". Link this new 5256 // namespace definition to the dummy namespace "std". 5257 StdNS->setNextNamespace(Namespc); 5258 StdNS->setLocation(IdentLoc); 5259 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5260 } 5261 5262 // Make our StdNamespace cache point at the first real definition of the 5263 // "std" namespace. 5264 StdNamespace = Namespc; 5265 5266 // Add this instance of "std" to the set of known namespaces 5267 KnownNamespaces[Namespc] = false; 5268 } else if (!Namespc->isInline()) { 5269 // Since this is an "original" namespace, add it to the known set of 5270 // namespaces if it is not an inline namespace. 5271 KnownNamespaces[Namespc] = false; 5272 } 5273 5274 PushOnScopeChains(Namespc, DeclRegionScope); 5275 } else { 5276 // Anonymous namespaces. 5277 assert(Namespc->isAnonymousNamespace()); 5278 5279 // Link the anonymous namespace into its parent. 5280 NamespaceDecl *PrevDecl; 5281 DeclContext *Parent = CurContext->getRedeclContext(); 5282 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5283 PrevDecl = TU->getAnonymousNamespace(); 5284 TU->setAnonymousNamespace(Namespc); 5285 } else { 5286 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5287 PrevDecl = ND->getAnonymousNamespace(); 5288 ND->setAnonymousNamespace(Namespc); 5289 } 5290 5291 // Link the anonymous namespace with its previous declaration. 5292 if (PrevDecl) { 5293 assert(PrevDecl->isAnonymousNamespace()); 5294 assert(!PrevDecl->getNextNamespace()); 5295 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5296 PrevDecl->setNextNamespace(Namespc); 5297 5298 if (Namespc->isInline() != PrevDecl->isInline()) { 5299 // inline-ness must match 5300 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5301 << Namespc->isInline(); 5302 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5303 Namespc->setInvalidDecl(); 5304 // Recover by ignoring the new namespace's inline status. 5305 Namespc->setInline(PrevDecl->isInline()); 5306 } 5307 } 5308 5309 CurContext->addDecl(Namespc); 5310 5311 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5312 // behaves as if it were replaced by 5313 // namespace unique { /* empty body */ } 5314 // using namespace unique; 5315 // namespace unique { namespace-body } 5316 // where all occurrences of 'unique' in a translation unit are 5317 // replaced by the same identifier and this identifier differs 5318 // from all other identifiers in the entire program. 5319 5320 // We just create the namespace with an empty name and then add an 5321 // implicit using declaration, just like the standard suggests. 5322 // 5323 // CodeGen enforces the "universally unique" aspect by giving all 5324 // declarations semantically contained within an anonymous 5325 // namespace internal linkage. 5326 5327 if (!PrevDecl) { 5328 UsingDirectiveDecl* UD 5329 = UsingDirectiveDecl::Create(Context, CurContext, 5330 /* 'using' */ LBrace, 5331 /* 'namespace' */ SourceLocation(), 5332 /* qualifier */ NestedNameSpecifierLoc(), 5333 /* identifier */ SourceLocation(), 5334 Namespc, 5335 /* Ancestor */ CurContext); 5336 UD->setImplicit(); 5337 CurContext->addDecl(UD); 5338 } 5339 } 5340 5341 // Although we could have an invalid decl (i.e. the namespace name is a 5342 // redefinition), push it as current DeclContext and try to continue parsing. 5343 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5344 // for the namespace has the declarations that showed up in that particular 5345 // namespace definition. 5346 PushDeclContext(NamespcScope, Namespc); 5347 return Namespc; 5348} 5349 5350/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5351/// is a namespace alias, returns the namespace it points to. 5352static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5353 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5354 return AD->getNamespace(); 5355 return dyn_cast_or_null<NamespaceDecl>(D); 5356} 5357 5358/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5359/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5360void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5361 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5362 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5363 Namespc->setRBraceLoc(RBrace); 5364 PopDeclContext(); 5365 if (Namespc->hasAttr<VisibilityAttr>()) 5366 PopPragmaVisibility(); 5367} 5368 5369CXXRecordDecl *Sema::getStdBadAlloc() const { 5370 return cast_or_null<CXXRecordDecl>( 5371 StdBadAlloc.get(Context.getExternalSource())); 5372} 5373 5374NamespaceDecl *Sema::getStdNamespace() const { 5375 return cast_or_null<NamespaceDecl>( 5376 StdNamespace.get(Context.getExternalSource())); 5377} 5378 5379/// \brief Retrieve the special "std" namespace, which may require us to 5380/// implicitly define the namespace. 5381NamespaceDecl *Sema::getOrCreateStdNamespace() { 5382 if (!StdNamespace) { 5383 // The "std" namespace has not yet been defined, so build one implicitly. 5384 StdNamespace = NamespaceDecl::Create(Context, 5385 Context.getTranslationUnitDecl(), 5386 SourceLocation(), SourceLocation(), 5387 &PP.getIdentifierTable().get("std")); 5388 getStdNamespace()->setImplicit(true); 5389 } 5390 5391 return getStdNamespace(); 5392} 5393 5394/// \brief Determine whether a using statement is in a context where it will be 5395/// apply in all contexts. 5396static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5397 switch (CurContext->getDeclKind()) { 5398 case Decl::TranslationUnit: 5399 return true; 5400 case Decl::LinkageSpec: 5401 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5402 default: 5403 return false; 5404 } 5405} 5406 5407static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5408 CXXScopeSpec &SS, 5409 SourceLocation IdentLoc, 5410 IdentifierInfo *Ident) { 5411 R.clear(); 5412 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5413 R.getLookupKind(), Sc, &SS, NULL, 5414 false, S.CTC_NoKeywords, NULL)) { 5415 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5416 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5417 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5418 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5419 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5420 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5421 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5422 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5423 else 5424 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5425 << Ident << CorrectedQuotedStr 5426 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5427 5428 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5429 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5430 5431 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5432 R.addDecl(Corrected.getCorrectionDecl()); 5433 return true; 5434 } 5435 R.setLookupName(Ident); 5436 } 5437 return false; 5438} 5439 5440Decl *Sema::ActOnUsingDirective(Scope *S, 5441 SourceLocation UsingLoc, 5442 SourceLocation NamespcLoc, 5443 CXXScopeSpec &SS, 5444 SourceLocation IdentLoc, 5445 IdentifierInfo *NamespcName, 5446 AttributeList *AttrList) { 5447 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5448 assert(NamespcName && "Invalid NamespcName."); 5449 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5450 5451 // This can only happen along a recovery path. 5452 while (S->getFlags() & Scope::TemplateParamScope) 5453 S = S->getParent(); 5454 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5455 5456 UsingDirectiveDecl *UDir = 0; 5457 NestedNameSpecifier *Qualifier = 0; 5458 if (SS.isSet()) 5459 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5460 5461 // Lookup namespace name. 5462 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5463 LookupParsedName(R, S, &SS); 5464 if (R.isAmbiguous()) 5465 return 0; 5466 5467 if (R.empty()) { 5468 R.clear(); 5469 // Allow "using namespace std;" or "using namespace ::std;" even if 5470 // "std" hasn't been defined yet, for GCC compatibility. 5471 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5472 NamespcName->isStr("std")) { 5473 Diag(IdentLoc, diag::ext_using_undefined_std); 5474 R.addDecl(getOrCreateStdNamespace()); 5475 R.resolveKind(); 5476 } 5477 // Otherwise, attempt typo correction. 5478 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5479 } 5480 5481 if (!R.empty()) { 5482 NamedDecl *Named = R.getFoundDecl(); 5483 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5484 && "expected namespace decl"); 5485 // C++ [namespace.udir]p1: 5486 // A using-directive specifies that the names in the nominated 5487 // namespace can be used in the scope in which the 5488 // using-directive appears after the using-directive. During 5489 // unqualified name lookup (3.4.1), the names appear as if they 5490 // were declared in the nearest enclosing namespace which 5491 // contains both the using-directive and the nominated 5492 // namespace. [Note: in this context, "contains" means "contains 5493 // directly or indirectly". ] 5494 5495 // Find enclosing context containing both using-directive and 5496 // nominated namespace. 5497 NamespaceDecl *NS = getNamespaceDecl(Named); 5498 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5499 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5500 CommonAncestor = CommonAncestor->getParent(); 5501 5502 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5503 SS.getWithLocInContext(Context), 5504 IdentLoc, Named, CommonAncestor); 5505 5506 if (IsUsingDirectiveInToplevelContext(CurContext) && 5507 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5508 Diag(IdentLoc, diag::warn_using_directive_in_header); 5509 } 5510 5511 PushUsingDirective(S, UDir); 5512 } else { 5513 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5514 } 5515 5516 // FIXME: We ignore attributes for now. 5517 return UDir; 5518} 5519 5520void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5521 // If scope has associated entity, then using directive is at namespace 5522 // or translation unit scope. We add UsingDirectiveDecls, into 5523 // it's lookup structure. 5524 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5525 Ctx->addDecl(UDir); 5526 else 5527 // Otherwise it is block-sope. using-directives will affect lookup 5528 // only to the end of scope. 5529 S->PushUsingDirective(UDir); 5530} 5531 5532 5533Decl *Sema::ActOnUsingDeclaration(Scope *S, 5534 AccessSpecifier AS, 5535 bool HasUsingKeyword, 5536 SourceLocation UsingLoc, 5537 CXXScopeSpec &SS, 5538 UnqualifiedId &Name, 5539 AttributeList *AttrList, 5540 bool IsTypeName, 5541 SourceLocation TypenameLoc) { 5542 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5543 5544 switch (Name.getKind()) { 5545 case UnqualifiedId::IK_ImplicitSelfParam: 5546 case UnqualifiedId::IK_Identifier: 5547 case UnqualifiedId::IK_OperatorFunctionId: 5548 case UnqualifiedId::IK_LiteralOperatorId: 5549 case UnqualifiedId::IK_ConversionFunctionId: 5550 break; 5551 5552 case UnqualifiedId::IK_ConstructorName: 5553 case UnqualifiedId::IK_ConstructorTemplateId: 5554 // C++0x inherited constructors. 5555 if (getLangOptions().CPlusPlus0x) break; 5556 5557 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5558 << SS.getRange(); 5559 return 0; 5560 5561 case UnqualifiedId::IK_DestructorName: 5562 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5563 << SS.getRange(); 5564 return 0; 5565 5566 case UnqualifiedId::IK_TemplateId: 5567 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5568 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5569 return 0; 5570 } 5571 5572 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5573 DeclarationName TargetName = TargetNameInfo.getName(); 5574 if (!TargetName) 5575 return 0; 5576 5577 // Warn about using declarations. 5578 // TODO: store that the declaration was written without 'using' and 5579 // talk about access decls instead of using decls in the 5580 // diagnostics. 5581 if (!HasUsingKeyword) { 5582 UsingLoc = Name.getSourceRange().getBegin(); 5583 5584 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5585 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5586 } 5587 5588 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5589 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5590 return 0; 5591 5592 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5593 TargetNameInfo, AttrList, 5594 /* IsInstantiation */ false, 5595 IsTypeName, TypenameLoc); 5596 if (UD) 5597 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5598 5599 return UD; 5600} 5601 5602/// \brief Determine whether a using declaration considers the given 5603/// declarations as "equivalent", e.g., if they are redeclarations of 5604/// the same entity or are both typedefs of the same type. 5605static bool 5606IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5607 bool &SuppressRedeclaration) { 5608 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5609 SuppressRedeclaration = false; 5610 return true; 5611 } 5612 5613 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5614 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5615 SuppressRedeclaration = true; 5616 return Context.hasSameType(TD1->getUnderlyingType(), 5617 TD2->getUnderlyingType()); 5618 } 5619 5620 return false; 5621} 5622 5623 5624/// Determines whether to create a using shadow decl for a particular 5625/// decl, given the set of decls existing prior to this using lookup. 5626bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5627 const LookupResult &Previous) { 5628 // Diagnose finding a decl which is not from a base class of the 5629 // current class. We do this now because there are cases where this 5630 // function will silently decide not to build a shadow decl, which 5631 // will pre-empt further diagnostics. 5632 // 5633 // We don't need to do this in C++0x because we do the check once on 5634 // the qualifier. 5635 // 5636 // FIXME: diagnose the following if we care enough: 5637 // struct A { int foo; }; 5638 // struct B : A { using A::foo; }; 5639 // template <class T> struct C : A {}; 5640 // template <class T> struct D : C<T> { using B::foo; } // <--- 5641 // This is invalid (during instantiation) in C++03 because B::foo 5642 // resolves to the using decl in B, which is not a base class of D<T>. 5643 // We can't diagnose it immediately because C<T> is an unknown 5644 // specialization. The UsingShadowDecl in D<T> then points directly 5645 // to A::foo, which will look well-formed when we instantiate. 5646 // The right solution is to not collapse the shadow-decl chain. 5647 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5648 DeclContext *OrigDC = Orig->getDeclContext(); 5649 5650 // Handle enums and anonymous structs. 5651 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5652 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5653 while (OrigRec->isAnonymousStructOrUnion()) 5654 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5655 5656 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5657 if (OrigDC == CurContext) { 5658 Diag(Using->getLocation(), 5659 diag::err_using_decl_nested_name_specifier_is_current_class) 5660 << Using->getQualifierLoc().getSourceRange(); 5661 Diag(Orig->getLocation(), diag::note_using_decl_target); 5662 return true; 5663 } 5664 5665 Diag(Using->getQualifierLoc().getBeginLoc(), 5666 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5667 << Using->getQualifier() 5668 << cast<CXXRecordDecl>(CurContext) 5669 << Using->getQualifierLoc().getSourceRange(); 5670 Diag(Orig->getLocation(), diag::note_using_decl_target); 5671 return true; 5672 } 5673 } 5674 5675 if (Previous.empty()) return false; 5676 5677 NamedDecl *Target = Orig; 5678 if (isa<UsingShadowDecl>(Target)) 5679 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5680 5681 // If the target happens to be one of the previous declarations, we 5682 // don't have a conflict. 5683 // 5684 // FIXME: but we might be increasing its access, in which case we 5685 // should redeclare it. 5686 NamedDecl *NonTag = 0, *Tag = 0; 5687 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5688 I != E; ++I) { 5689 NamedDecl *D = (*I)->getUnderlyingDecl(); 5690 bool Result; 5691 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5692 return Result; 5693 5694 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5695 } 5696 5697 if (Target->isFunctionOrFunctionTemplate()) { 5698 FunctionDecl *FD; 5699 if (isa<FunctionTemplateDecl>(Target)) 5700 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5701 else 5702 FD = cast<FunctionDecl>(Target); 5703 5704 NamedDecl *OldDecl = 0; 5705 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5706 case Ovl_Overload: 5707 return false; 5708 5709 case Ovl_NonFunction: 5710 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5711 break; 5712 5713 // We found a decl with the exact signature. 5714 case Ovl_Match: 5715 // If we're in a record, we want to hide the target, so we 5716 // return true (without a diagnostic) to tell the caller not to 5717 // build a shadow decl. 5718 if (CurContext->isRecord()) 5719 return true; 5720 5721 // If we're not in a record, this is an error. 5722 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5723 break; 5724 } 5725 5726 Diag(Target->getLocation(), diag::note_using_decl_target); 5727 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5728 return true; 5729 } 5730 5731 // Target is not a function. 5732 5733 if (isa<TagDecl>(Target)) { 5734 // No conflict between a tag and a non-tag. 5735 if (!Tag) return false; 5736 5737 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5738 Diag(Target->getLocation(), diag::note_using_decl_target); 5739 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5740 return true; 5741 } 5742 5743 // No conflict between a tag and a non-tag. 5744 if (!NonTag) return false; 5745 5746 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5747 Diag(Target->getLocation(), diag::note_using_decl_target); 5748 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5749 return true; 5750} 5751 5752/// Builds a shadow declaration corresponding to a 'using' declaration. 5753UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5754 UsingDecl *UD, 5755 NamedDecl *Orig) { 5756 5757 // If we resolved to another shadow declaration, just coalesce them. 5758 NamedDecl *Target = Orig; 5759 if (isa<UsingShadowDecl>(Target)) { 5760 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5761 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5762 } 5763 5764 UsingShadowDecl *Shadow 5765 = UsingShadowDecl::Create(Context, CurContext, 5766 UD->getLocation(), UD, Target); 5767 UD->addShadowDecl(Shadow); 5768 5769 Shadow->setAccess(UD->getAccess()); 5770 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5771 Shadow->setInvalidDecl(); 5772 5773 if (S) 5774 PushOnScopeChains(Shadow, S); 5775 else 5776 CurContext->addDecl(Shadow); 5777 5778 5779 return Shadow; 5780} 5781 5782/// Hides a using shadow declaration. This is required by the current 5783/// using-decl implementation when a resolvable using declaration in a 5784/// class is followed by a declaration which would hide or override 5785/// one or more of the using decl's targets; for example: 5786/// 5787/// struct Base { void foo(int); }; 5788/// struct Derived : Base { 5789/// using Base::foo; 5790/// void foo(int); 5791/// }; 5792/// 5793/// The governing language is C++03 [namespace.udecl]p12: 5794/// 5795/// When a using-declaration brings names from a base class into a 5796/// derived class scope, member functions in the derived class 5797/// override and/or hide member functions with the same name and 5798/// parameter types in a base class (rather than conflicting). 5799/// 5800/// There are two ways to implement this: 5801/// (1) optimistically create shadow decls when they're not hidden 5802/// by existing declarations, or 5803/// (2) don't create any shadow decls (or at least don't make them 5804/// visible) until we've fully parsed/instantiated the class. 5805/// The problem with (1) is that we might have to retroactively remove 5806/// a shadow decl, which requires several O(n) operations because the 5807/// decl structures are (very reasonably) not designed for removal. 5808/// (2) avoids this but is very fiddly and phase-dependent. 5809void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5810 if (Shadow->getDeclName().getNameKind() == 5811 DeclarationName::CXXConversionFunctionName) 5812 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5813 5814 // Remove it from the DeclContext... 5815 Shadow->getDeclContext()->removeDecl(Shadow); 5816 5817 // ...and the scope, if applicable... 5818 if (S) { 5819 S->RemoveDecl(Shadow); 5820 IdResolver.RemoveDecl(Shadow); 5821 } 5822 5823 // ...and the using decl. 5824 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5825 5826 // TODO: complain somehow if Shadow was used. It shouldn't 5827 // be possible for this to happen, because...? 5828} 5829 5830/// Builds a using declaration. 5831/// 5832/// \param IsInstantiation - Whether this call arises from an 5833/// instantiation of an unresolved using declaration. We treat 5834/// the lookup differently for these declarations. 5835NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5836 SourceLocation UsingLoc, 5837 CXXScopeSpec &SS, 5838 const DeclarationNameInfo &NameInfo, 5839 AttributeList *AttrList, 5840 bool IsInstantiation, 5841 bool IsTypeName, 5842 SourceLocation TypenameLoc) { 5843 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5844 SourceLocation IdentLoc = NameInfo.getLoc(); 5845 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5846 5847 // FIXME: We ignore attributes for now. 5848 5849 if (SS.isEmpty()) { 5850 Diag(IdentLoc, diag::err_using_requires_qualname); 5851 return 0; 5852 } 5853 5854 // Do the redeclaration lookup in the current scope. 5855 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5856 ForRedeclaration); 5857 Previous.setHideTags(false); 5858 if (S) { 5859 LookupName(Previous, S); 5860 5861 // It is really dumb that we have to do this. 5862 LookupResult::Filter F = Previous.makeFilter(); 5863 while (F.hasNext()) { 5864 NamedDecl *D = F.next(); 5865 if (!isDeclInScope(D, CurContext, S)) 5866 F.erase(); 5867 } 5868 F.done(); 5869 } else { 5870 assert(IsInstantiation && "no scope in non-instantiation"); 5871 assert(CurContext->isRecord() && "scope not record in instantiation"); 5872 LookupQualifiedName(Previous, CurContext); 5873 } 5874 5875 // Check for invalid redeclarations. 5876 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5877 return 0; 5878 5879 // Check for bad qualifiers. 5880 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5881 return 0; 5882 5883 DeclContext *LookupContext = computeDeclContext(SS); 5884 NamedDecl *D; 5885 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5886 if (!LookupContext) { 5887 if (IsTypeName) { 5888 // FIXME: not all declaration name kinds are legal here 5889 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5890 UsingLoc, TypenameLoc, 5891 QualifierLoc, 5892 IdentLoc, NameInfo.getName()); 5893 } else { 5894 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5895 QualifierLoc, NameInfo); 5896 } 5897 } else { 5898 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5899 NameInfo, IsTypeName); 5900 } 5901 D->setAccess(AS); 5902 CurContext->addDecl(D); 5903 5904 if (!LookupContext) return D; 5905 UsingDecl *UD = cast<UsingDecl>(D); 5906 5907 if (RequireCompleteDeclContext(SS, LookupContext)) { 5908 UD->setInvalidDecl(); 5909 return UD; 5910 } 5911 5912 // Constructor inheriting using decls get special treatment. 5913 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5914 if (CheckInheritedConstructorUsingDecl(UD)) 5915 UD->setInvalidDecl(); 5916 return UD; 5917 } 5918 5919 // Otherwise, look up the target name. 5920 5921 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5922 R.setUsingDeclaration(true); 5923 5924 // Unlike most lookups, we don't always want to hide tag 5925 // declarations: tag names are visible through the using declaration 5926 // even if hidden by ordinary names, *except* in a dependent context 5927 // where it's important for the sanity of two-phase lookup. 5928 if (!IsInstantiation) 5929 R.setHideTags(false); 5930 5931 LookupQualifiedName(R, LookupContext); 5932 5933 if (R.empty()) { 5934 Diag(IdentLoc, diag::err_no_member) 5935 << NameInfo.getName() << LookupContext << SS.getRange(); 5936 UD->setInvalidDecl(); 5937 return UD; 5938 } 5939 5940 if (R.isAmbiguous()) { 5941 UD->setInvalidDecl(); 5942 return UD; 5943 } 5944 5945 if (IsTypeName) { 5946 // If we asked for a typename and got a non-type decl, error out. 5947 if (!R.getAsSingle<TypeDecl>()) { 5948 Diag(IdentLoc, diag::err_using_typename_non_type); 5949 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5950 Diag((*I)->getUnderlyingDecl()->getLocation(), 5951 diag::note_using_decl_target); 5952 UD->setInvalidDecl(); 5953 return UD; 5954 } 5955 } else { 5956 // If we asked for a non-typename and we got a type, error out, 5957 // but only if this is an instantiation of an unresolved using 5958 // decl. Otherwise just silently find the type name. 5959 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5960 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5961 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5962 UD->setInvalidDecl(); 5963 return UD; 5964 } 5965 } 5966 5967 // C++0x N2914 [namespace.udecl]p6: 5968 // A using-declaration shall not name a namespace. 5969 if (R.getAsSingle<NamespaceDecl>()) { 5970 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5971 << SS.getRange(); 5972 UD->setInvalidDecl(); 5973 return UD; 5974 } 5975 5976 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5977 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5978 BuildUsingShadowDecl(S, UD, *I); 5979 } 5980 5981 return UD; 5982} 5983 5984/// Additional checks for a using declaration referring to a constructor name. 5985bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5986 if (UD->isTypeName()) { 5987 // FIXME: Cannot specify typename when specifying constructor 5988 return true; 5989 } 5990 5991 const Type *SourceType = UD->getQualifier()->getAsType(); 5992 assert(SourceType && 5993 "Using decl naming constructor doesn't have type in scope spec."); 5994 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5995 5996 // Check whether the named type is a direct base class. 5997 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5998 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5999 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6000 BaseIt != BaseE; ++BaseIt) { 6001 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6002 if (CanonicalSourceType == BaseType) 6003 break; 6004 } 6005 6006 if (BaseIt == BaseE) { 6007 // Did not find SourceType in the bases. 6008 Diag(UD->getUsingLocation(), 6009 diag::err_using_decl_constructor_not_in_direct_base) 6010 << UD->getNameInfo().getSourceRange() 6011 << QualType(SourceType, 0) << TargetClass; 6012 return true; 6013 } 6014 6015 BaseIt->setInheritConstructors(); 6016 6017 return false; 6018} 6019 6020/// Checks that the given using declaration is not an invalid 6021/// redeclaration. Note that this is checking only for the using decl 6022/// itself, not for any ill-formedness among the UsingShadowDecls. 6023bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6024 bool isTypeName, 6025 const CXXScopeSpec &SS, 6026 SourceLocation NameLoc, 6027 const LookupResult &Prev) { 6028 // C++03 [namespace.udecl]p8: 6029 // C++0x [namespace.udecl]p10: 6030 // A using-declaration is a declaration and can therefore be used 6031 // repeatedly where (and only where) multiple declarations are 6032 // allowed. 6033 // 6034 // That's in non-member contexts. 6035 if (!CurContext->getRedeclContext()->isRecord()) 6036 return false; 6037 6038 NestedNameSpecifier *Qual 6039 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6040 6041 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6042 NamedDecl *D = *I; 6043 6044 bool DTypename; 6045 NestedNameSpecifier *DQual; 6046 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6047 DTypename = UD->isTypeName(); 6048 DQual = UD->getQualifier(); 6049 } else if (UnresolvedUsingValueDecl *UD 6050 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6051 DTypename = false; 6052 DQual = UD->getQualifier(); 6053 } else if (UnresolvedUsingTypenameDecl *UD 6054 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6055 DTypename = true; 6056 DQual = UD->getQualifier(); 6057 } else continue; 6058 6059 // using decls differ if one says 'typename' and the other doesn't. 6060 // FIXME: non-dependent using decls? 6061 if (isTypeName != DTypename) continue; 6062 6063 // using decls differ if they name different scopes (but note that 6064 // template instantiation can cause this check to trigger when it 6065 // didn't before instantiation). 6066 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6067 Context.getCanonicalNestedNameSpecifier(DQual)) 6068 continue; 6069 6070 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6071 Diag(D->getLocation(), diag::note_using_decl) << 1; 6072 return true; 6073 } 6074 6075 return false; 6076} 6077 6078 6079/// Checks that the given nested-name qualifier used in a using decl 6080/// in the current context is appropriately related to the current 6081/// scope. If an error is found, diagnoses it and returns true. 6082bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6083 const CXXScopeSpec &SS, 6084 SourceLocation NameLoc) { 6085 DeclContext *NamedContext = computeDeclContext(SS); 6086 6087 if (!CurContext->isRecord()) { 6088 // C++03 [namespace.udecl]p3: 6089 // C++0x [namespace.udecl]p8: 6090 // A using-declaration for a class member shall be a member-declaration. 6091 6092 // If we weren't able to compute a valid scope, it must be a 6093 // dependent class scope. 6094 if (!NamedContext || NamedContext->isRecord()) { 6095 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6096 << SS.getRange(); 6097 return true; 6098 } 6099 6100 // Otherwise, everything is known to be fine. 6101 return false; 6102 } 6103 6104 // The current scope is a record. 6105 6106 // If the named context is dependent, we can't decide much. 6107 if (!NamedContext) { 6108 // FIXME: in C++0x, we can diagnose if we can prove that the 6109 // nested-name-specifier does not refer to a base class, which is 6110 // still possible in some cases. 6111 6112 // Otherwise we have to conservatively report that things might be 6113 // okay. 6114 return false; 6115 } 6116 6117 if (!NamedContext->isRecord()) { 6118 // Ideally this would point at the last name in the specifier, 6119 // but we don't have that level of source info. 6120 Diag(SS.getRange().getBegin(), 6121 diag::err_using_decl_nested_name_specifier_is_not_class) 6122 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6123 return true; 6124 } 6125 6126 if (!NamedContext->isDependentContext() && 6127 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6128 return true; 6129 6130 if (getLangOptions().CPlusPlus0x) { 6131 // C++0x [namespace.udecl]p3: 6132 // In a using-declaration used as a member-declaration, the 6133 // nested-name-specifier shall name a base class of the class 6134 // being defined. 6135 6136 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6137 cast<CXXRecordDecl>(NamedContext))) { 6138 if (CurContext == NamedContext) { 6139 Diag(NameLoc, 6140 diag::err_using_decl_nested_name_specifier_is_current_class) 6141 << SS.getRange(); 6142 return true; 6143 } 6144 6145 Diag(SS.getRange().getBegin(), 6146 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6147 << (NestedNameSpecifier*) SS.getScopeRep() 6148 << cast<CXXRecordDecl>(CurContext) 6149 << SS.getRange(); 6150 return true; 6151 } 6152 6153 return false; 6154 } 6155 6156 // C++03 [namespace.udecl]p4: 6157 // A using-declaration used as a member-declaration shall refer 6158 // to a member of a base class of the class being defined [etc.]. 6159 6160 // Salient point: SS doesn't have to name a base class as long as 6161 // lookup only finds members from base classes. Therefore we can 6162 // diagnose here only if we can prove that that can't happen, 6163 // i.e. if the class hierarchies provably don't intersect. 6164 6165 // TODO: it would be nice if "definitely valid" results were cached 6166 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6167 // need to be repeated. 6168 6169 struct UserData { 6170 llvm::DenseSet<const CXXRecordDecl*> Bases; 6171 6172 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6173 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6174 Data->Bases.insert(Base); 6175 return true; 6176 } 6177 6178 bool hasDependentBases(const CXXRecordDecl *Class) { 6179 return !Class->forallBases(collect, this); 6180 } 6181 6182 /// Returns true if the base is dependent or is one of the 6183 /// accumulated base classes. 6184 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6185 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6186 return !Data->Bases.count(Base); 6187 } 6188 6189 bool mightShareBases(const CXXRecordDecl *Class) { 6190 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6191 } 6192 }; 6193 6194 UserData Data; 6195 6196 // Returns false if we find a dependent base. 6197 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6198 return false; 6199 6200 // Returns false if the class has a dependent base or if it or one 6201 // of its bases is present in the base set of the current context. 6202 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6203 return false; 6204 6205 Diag(SS.getRange().getBegin(), 6206 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6207 << (NestedNameSpecifier*) SS.getScopeRep() 6208 << cast<CXXRecordDecl>(CurContext) 6209 << SS.getRange(); 6210 6211 return true; 6212} 6213 6214Decl *Sema::ActOnAliasDeclaration(Scope *S, 6215 AccessSpecifier AS, 6216 MultiTemplateParamsArg TemplateParamLists, 6217 SourceLocation UsingLoc, 6218 UnqualifiedId &Name, 6219 TypeResult Type) { 6220 // Skip up to the relevant declaration scope. 6221 while (S->getFlags() & Scope::TemplateParamScope) 6222 S = S->getParent(); 6223 assert((S->getFlags() & Scope::DeclScope) && 6224 "got alias-declaration outside of declaration scope"); 6225 6226 if (Type.isInvalid()) 6227 return 0; 6228 6229 bool Invalid = false; 6230 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6231 TypeSourceInfo *TInfo = 0; 6232 GetTypeFromParser(Type.get(), &TInfo); 6233 6234 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6235 return 0; 6236 6237 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6238 UPPC_DeclarationType)) { 6239 Invalid = true; 6240 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6241 TInfo->getTypeLoc().getBeginLoc()); 6242 } 6243 6244 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6245 LookupName(Previous, S); 6246 6247 // Warn about shadowing the name of a template parameter. 6248 if (Previous.isSingleResult() && 6249 Previous.getFoundDecl()->isTemplateParameter()) { 6250 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6251 Previous.getFoundDecl())) 6252 Invalid = true; 6253 Previous.clear(); 6254 } 6255 6256 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6257 "name in alias declaration must be an identifier"); 6258 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6259 Name.StartLocation, 6260 Name.Identifier, TInfo); 6261 6262 NewTD->setAccess(AS); 6263 6264 if (Invalid) 6265 NewTD->setInvalidDecl(); 6266 6267 CheckTypedefForVariablyModifiedType(S, NewTD); 6268 Invalid |= NewTD->isInvalidDecl(); 6269 6270 bool Redeclaration = false; 6271 6272 NamedDecl *NewND; 6273 if (TemplateParamLists.size()) { 6274 TypeAliasTemplateDecl *OldDecl = 0; 6275 TemplateParameterList *OldTemplateParams = 0; 6276 6277 if (TemplateParamLists.size() != 1) { 6278 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6279 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6280 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6281 } 6282 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6283 6284 // Only consider previous declarations in the same scope. 6285 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6286 /*ExplicitInstantiationOrSpecialization*/false); 6287 if (!Previous.empty()) { 6288 Redeclaration = true; 6289 6290 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6291 if (!OldDecl && !Invalid) { 6292 Diag(UsingLoc, diag::err_redefinition_different_kind) 6293 << Name.Identifier; 6294 6295 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6296 if (OldD->getLocation().isValid()) 6297 Diag(OldD->getLocation(), diag::note_previous_definition); 6298 6299 Invalid = true; 6300 } 6301 6302 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6303 if (TemplateParameterListsAreEqual(TemplateParams, 6304 OldDecl->getTemplateParameters(), 6305 /*Complain=*/true, 6306 TPL_TemplateMatch)) 6307 OldTemplateParams = OldDecl->getTemplateParameters(); 6308 else 6309 Invalid = true; 6310 6311 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6312 if (!Invalid && 6313 !Context.hasSameType(OldTD->getUnderlyingType(), 6314 NewTD->getUnderlyingType())) { 6315 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6316 // but we can't reasonably accept it. 6317 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6318 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6319 if (OldTD->getLocation().isValid()) 6320 Diag(OldTD->getLocation(), diag::note_previous_definition); 6321 Invalid = true; 6322 } 6323 } 6324 } 6325 6326 // Merge any previous default template arguments into our parameters, 6327 // and check the parameter list. 6328 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6329 TPC_TypeAliasTemplate)) 6330 return 0; 6331 6332 TypeAliasTemplateDecl *NewDecl = 6333 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6334 Name.Identifier, TemplateParams, 6335 NewTD); 6336 6337 NewDecl->setAccess(AS); 6338 6339 if (Invalid) 6340 NewDecl->setInvalidDecl(); 6341 else if (OldDecl) 6342 NewDecl->setPreviousDeclaration(OldDecl); 6343 6344 NewND = NewDecl; 6345 } else { 6346 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6347 NewND = NewTD; 6348 } 6349 6350 if (!Redeclaration) 6351 PushOnScopeChains(NewND, S); 6352 6353 return NewND; 6354} 6355 6356Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6357 SourceLocation NamespaceLoc, 6358 SourceLocation AliasLoc, 6359 IdentifierInfo *Alias, 6360 CXXScopeSpec &SS, 6361 SourceLocation IdentLoc, 6362 IdentifierInfo *Ident) { 6363 6364 // Lookup the namespace name. 6365 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6366 LookupParsedName(R, S, &SS); 6367 6368 // Check if we have a previous declaration with the same name. 6369 NamedDecl *PrevDecl 6370 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6371 ForRedeclaration); 6372 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6373 PrevDecl = 0; 6374 6375 if (PrevDecl) { 6376 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6377 // We already have an alias with the same name that points to the same 6378 // namespace, so don't create a new one. 6379 // FIXME: At some point, we'll want to create the (redundant) 6380 // declaration to maintain better source information. 6381 if (!R.isAmbiguous() && !R.empty() && 6382 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6383 return 0; 6384 } 6385 6386 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6387 diag::err_redefinition_different_kind; 6388 Diag(AliasLoc, DiagID) << Alias; 6389 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6390 return 0; 6391 } 6392 6393 if (R.isAmbiguous()) 6394 return 0; 6395 6396 if (R.empty()) { 6397 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6398 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6399 return 0; 6400 } 6401 } 6402 6403 NamespaceAliasDecl *AliasDecl = 6404 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6405 Alias, SS.getWithLocInContext(Context), 6406 IdentLoc, R.getFoundDecl()); 6407 6408 PushOnScopeChains(AliasDecl, S); 6409 return AliasDecl; 6410} 6411 6412namespace { 6413 /// \brief Scoped object used to handle the state changes required in Sema 6414 /// to implicitly define the body of a C++ member function; 6415 class ImplicitlyDefinedFunctionScope { 6416 Sema &S; 6417 Sema::ContextRAII SavedContext; 6418 6419 public: 6420 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6421 : S(S), SavedContext(S, Method) 6422 { 6423 S.PushFunctionScope(); 6424 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6425 } 6426 6427 ~ImplicitlyDefinedFunctionScope() { 6428 S.PopExpressionEvaluationContext(); 6429 S.PopFunctionOrBlockScope(); 6430 } 6431 }; 6432} 6433 6434Sema::ImplicitExceptionSpecification 6435Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6436 // C++ [except.spec]p14: 6437 // An implicitly declared special member function (Clause 12) shall have an 6438 // exception-specification. [...] 6439 ImplicitExceptionSpecification ExceptSpec(Context); 6440 if (ClassDecl->isInvalidDecl()) 6441 return ExceptSpec; 6442 6443 // Direct base-class constructors. 6444 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6445 BEnd = ClassDecl->bases_end(); 6446 B != BEnd; ++B) { 6447 if (B->isVirtual()) // Handled below. 6448 continue; 6449 6450 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6451 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6452 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6453 // If this is a deleted function, add it anyway. This might be conformant 6454 // with the standard. This might not. I'm not sure. It might not matter. 6455 if (Constructor) 6456 ExceptSpec.CalledDecl(Constructor); 6457 } 6458 } 6459 6460 // Virtual base-class constructors. 6461 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6462 BEnd = ClassDecl->vbases_end(); 6463 B != BEnd; ++B) { 6464 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6465 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6466 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6467 // If this is a deleted function, add it anyway. This might be conformant 6468 // with the standard. This might not. I'm not sure. It might not matter. 6469 if (Constructor) 6470 ExceptSpec.CalledDecl(Constructor); 6471 } 6472 } 6473 6474 // Field constructors. 6475 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6476 FEnd = ClassDecl->field_end(); 6477 F != FEnd; ++F) { 6478 if (F->hasInClassInitializer()) { 6479 if (Expr *E = F->getInClassInitializer()) 6480 ExceptSpec.CalledExpr(E); 6481 else if (!F->isInvalidDecl()) 6482 ExceptSpec.SetDelayed(); 6483 } else if (const RecordType *RecordTy 6484 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6485 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6486 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6487 // If this is a deleted function, add it anyway. This might be conformant 6488 // with the standard. This might not. I'm not sure. It might not matter. 6489 // In particular, the problem is that this function never gets called. It 6490 // might just be ill-formed because this function attempts to refer to 6491 // a deleted function here. 6492 if (Constructor) 6493 ExceptSpec.CalledDecl(Constructor); 6494 } 6495 } 6496 6497 return ExceptSpec; 6498} 6499 6500CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6501 CXXRecordDecl *ClassDecl) { 6502 // C++ [class.ctor]p5: 6503 // A default constructor for a class X is a constructor of class X 6504 // that can be called without an argument. If there is no 6505 // user-declared constructor for class X, a default constructor is 6506 // implicitly declared. An implicitly-declared default constructor 6507 // is an inline public member of its class. 6508 assert(!ClassDecl->hasUserDeclaredConstructor() && 6509 "Should not build implicit default constructor!"); 6510 6511 ImplicitExceptionSpecification Spec = 6512 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6513 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6514 6515 // Create the actual constructor declaration. 6516 CanQualType ClassType 6517 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6518 SourceLocation ClassLoc = ClassDecl->getLocation(); 6519 DeclarationName Name 6520 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6521 DeclarationNameInfo NameInfo(Name, ClassLoc); 6522 CXXConstructorDecl *DefaultCon 6523 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6524 Context.getFunctionType(Context.VoidTy, 6525 0, 0, EPI), 6526 /*TInfo=*/0, 6527 /*isExplicit=*/false, 6528 /*isInline=*/true, 6529 /*isImplicitlyDeclared=*/true, 6530 // FIXME: apply the rules for definitions here 6531 /*isConstexpr=*/false); 6532 DefaultCon->setAccess(AS_public); 6533 DefaultCon->setDefaulted(); 6534 DefaultCon->setImplicit(); 6535 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6536 6537 // Note that we have declared this constructor. 6538 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6539 6540 if (Scope *S = getScopeForContext(ClassDecl)) 6541 PushOnScopeChains(DefaultCon, S, false); 6542 ClassDecl->addDecl(DefaultCon); 6543 6544 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6545 DefaultCon->setDeletedAsWritten(); 6546 6547 return DefaultCon; 6548} 6549 6550void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6551 CXXConstructorDecl *Constructor) { 6552 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6553 !Constructor->doesThisDeclarationHaveABody() && 6554 !Constructor->isDeleted()) && 6555 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6556 6557 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6558 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6559 6560 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6561 DiagnosticErrorTrap Trap(Diags); 6562 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6563 Trap.hasErrorOccurred()) { 6564 Diag(CurrentLocation, diag::note_member_synthesized_at) 6565 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6566 Constructor->setInvalidDecl(); 6567 return; 6568 } 6569 6570 SourceLocation Loc = Constructor->getLocation(); 6571 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6572 6573 Constructor->setUsed(); 6574 MarkVTableUsed(CurrentLocation, ClassDecl); 6575 6576 if (ASTMutationListener *L = getASTMutationListener()) { 6577 L->CompletedImplicitDefinition(Constructor); 6578 } 6579} 6580 6581/// Get any existing defaulted default constructor for the given class. Do not 6582/// implicitly define one if it does not exist. 6583static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6584 CXXRecordDecl *D) { 6585 ASTContext &Context = Self.Context; 6586 QualType ClassType = Context.getTypeDeclType(D); 6587 DeclarationName ConstructorName 6588 = Context.DeclarationNames.getCXXConstructorName( 6589 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6590 6591 DeclContext::lookup_const_iterator Con, ConEnd; 6592 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6593 Con != ConEnd; ++Con) { 6594 // A function template cannot be defaulted. 6595 if (isa<FunctionTemplateDecl>(*Con)) 6596 continue; 6597 6598 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6599 if (Constructor->isDefaultConstructor()) 6600 return Constructor->isDefaulted() ? Constructor : 0; 6601 } 6602 return 0; 6603} 6604 6605void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6606 if (!D) return; 6607 AdjustDeclIfTemplate(D); 6608 6609 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6610 CXXConstructorDecl *CtorDecl 6611 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6612 6613 if (!CtorDecl) return; 6614 6615 // Compute the exception specification for the default constructor. 6616 const FunctionProtoType *CtorTy = 6617 CtorDecl->getType()->castAs<FunctionProtoType>(); 6618 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6619 ImplicitExceptionSpecification Spec = 6620 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6621 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6622 assert(EPI.ExceptionSpecType != EST_Delayed); 6623 6624 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6625 } 6626 6627 // If the default constructor is explicitly defaulted, checking the exception 6628 // specification is deferred until now. 6629 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6630 !ClassDecl->isDependentType()) 6631 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6632} 6633 6634void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6635 // We start with an initial pass over the base classes to collect those that 6636 // inherit constructors from. If there are none, we can forgo all further 6637 // processing. 6638 typedef SmallVector<const RecordType *, 4> BasesVector; 6639 BasesVector BasesToInheritFrom; 6640 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6641 BaseE = ClassDecl->bases_end(); 6642 BaseIt != BaseE; ++BaseIt) { 6643 if (BaseIt->getInheritConstructors()) { 6644 QualType Base = BaseIt->getType(); 6645 if (Base->isDependentType()) { 6646 // If we inherit constructors from anything that is dependent, just 6647 // abort processing altogether. We'll get another chance for the 6648 // instantiations. 6649 return; 6650 } 6651 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6652 } 6653 } 6654 if (BasesToInheritFrom.empty()) 6655 return; 6656 6657 // Now collect the constructors that we already have in the current class. 6658 // Those take precedence over inherited constructors. 6659 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6660 // unless there is a user-declared constructor with the same signature in 6661 // the class where the using-declaration appears. 6662 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6663 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6664 CtorE = ClassDecl->ctor_end(); 6665 CtorIt != CtorE; ++CtorIt) { 6666 ExistingConstructors.insert( 6667 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6668 } 6669 6670 Scope *S = getScopeForContext(ClassDecl); 6671 DeclarationName CreatedCtorName = 6672 Context.DeclarationNames.getCXXConstructorName( 6673 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6674 6675 // Now comes the true work. 6676 // First, we keep a map from constructor types to the base that introduced 6677 // them. Needed for finding conflicting constructors. We also keep the 6678 // actually inserted declarations in there, for pretty diagnostics. 6679 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6680 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6681 ConstructorToSourceMap InheritedConstructors; 6682 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6683 BaseE = BasesToInheritFrom.end(); 6684 BaseIt != BaseE; ++BaseIt) { 6685 const RecordType *Base = *BaseIt; 6686 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6687 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6688 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6689 CtorE = BaseDecl->ctor_end(); 6690 CtorIt != CtorE; ++CtorIt) { 6691 // Find the using declaration for inheriting this base's constructors. 6692 DeclarationName Name = 6693 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6694 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6695 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6696 SourceLocation UsingLoc = UD ? UD->getLocation() : 6697 ClassDecl->getLocation(); 6698 6699 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6700 // from the class X named in the using-declaration consists of actual 6701 // constructors and notional constructors that result from the 6702 // transformation of defaulted parameters as follows: 6703 // - all non-template default constructors of X, and 6704 // - for each non-template constructor of X that has at least one 6705 // parameter with a default argument, the set of constructors that 6706 // results from omitting any ellipsis parameter specification and 6707 // successively omitting parameters with a default argument from the 6708 // end of the parameter-type-list. 6709 CXXConstructorDecl *BaseCtor = *CtorIt; 6710 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6711 const FunctionProtoType *BaseCtorType = 6712 BaseCtor->getType()->getAs<FunctionProtoType>(); 6713 6714 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6715 maxParams = BaseCtor->getNumParams(); 6716 params <= maxParams; ++params) { 6717 // Skip default constructors. They're never inherited. 6718 if (params == 0) 6719 continue; 6720 // Skip copy and move constructors for the same reason. 6721 if (CanBeCopyOrMove && params == 1) 6722 continue; 6723 6724 // Build up a function type for this particular constructor. 6725 // FIXME: The working paper does not consider that the exception spec 6726 // for the inheriting constructor might be larger than that of the 6727 // source. This code doesn't yet, either. When it does, this code will 6728 // need to be delayed until after exception specifications and in-class 6729 // member initializers are attached. 6730 const Type *NewCtorType; 6731 if (params == maxParams) 6732 NewCtorType = BaseCtorType; 6733 else { 6734 SmallVector<QualType, 16> Args; 6735 for (unsigned i = 0; i < params; ++i) { 6736 Args.push_back(BaseCtorType->getArgType(i)); 6737 } 6738 FunctionProtoType::ExtProtoInfo ExtInfo = 6739 BaseCtorType->getExtProtoInfo(); 6740 ExtInfo.Variadic = false; 6741 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6742 Args.data(), params, ExtInfo) 6743 .getTypePtr(); 6744 } 6745 const Type *CanonicalNewCtorType = 6746 Context.getCanonicalType(NewCtorType); 6747 6748 // Now that we have the type, first check if the class already has a 6749 // constructor with this signature. 6750 if (ExistingConstructors.count(CanonicalNewCtorType)) 6751 continue; 6752 6753 // Then we check if we have already declared an inherited constructor 6754 // with this signature. 6755 std::pair<ConstructorToSourceMap::iterator, bool> result = 6756 InheritedConstructors.insert(std::make_pair( 6757 CanonicalNewCtorType, 6758 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6759 if (!result.second) { 6760 // Already in the map. If it came from a different class, that's an 6761 // error. Not if it's from the same. 6762 CanQualType PreviousBase = result.first->second.first; 6763 if (CanonicalBase != PreviousBase) { 6764 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6765 const CXXConstructorDecl *PrevBaseCtor = 6766 PrevCtor->getInheritedConstructor(); 6767 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6768 6769 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6770 Diag(BaseCtor->getLocation(), 6771 diag::note_using_decl_constructor_conflict_current_ctor); 6772 Diag(PrevBaseCtor->getLocation(), 6773 diag::note_using_decl_constructor_conflict_previous_ctor); 6774 Diag(PrevCtor->getLocation(), 6775 diag::note_using_decl_constructor_conflict_previous_using); 6776 } 6777 continue; 6778 } 6779 6780 // OK, we're there, now add the constructor. 6781 // C++0x [class.inhctor]p8: [...] that would be performed by a 6782 // user-written inline constructor [...] 6783 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6784 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6785 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6786 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6787 /*ImplicitlyDeclared=*/true, 6788 // FIXME: Due to a defect in the standard, we treat inherited 6789 // constructors as constexpr even if that makes them ill-formed. 6790 /*Constexpr=*/BaseCtor->isConstexpr()); 6791 NewCtor->setAccess(BaseCtor->getAccess()); 6792 6793 // Build up the parameter decls and add them. 6794 SmallVector<ParmVarDecl *, 16> ParamDecls; 6795 for (unsigned i = 0; i < params; ++i) { 6796 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6797 UsingLoc, UsingLoc, 6798 /*IdentifierInfo=*/0, 6799 BaseCtorType->getArgType(i), 6800 /*TInfo=*/0, SC_None, 6801 SC_None, /*DefaultArg=*/0)); 6802 } 6803 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6804 NewCtor->setInheritedConstructor(BaseCtor); 6805 6806 PushOnScopeChains(NewCtor, S, false); 6807 ClassDecl->addDecl(NewCtor); 6808 result.first->second.second = NewCtor; 6809 } 6810 } 6811 } 6812} 6813 6814Sema::ImplicitExceptionSpecification 6815Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6816 // C++ [except.spec]p14: 6817 // An implicitly declared special member function (Clause 12) shall have 6818 // an exception-specification. 6819 ImplicitExceptionSpecification ExceptSpec(Context); 6820 if (ClassDecl->isInvalidDecl()) 6821 return ExceptSpec; 6822 6823 // Direct base-class destructors. 6824 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6825 BEnd = ClassDecl->bases_end(); 6826 B != BEnd; ++B) { 6827 if (B->isVirtual()) // Handled below. 6828 continue; 6829 6830 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6831 ExceptSpec.CalledDecl( 6832 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6833 } 6834 6835 // Virtual base-class destructors. 6836 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6837 BEnd = ClassDecl->vbases_end(); 6838 B != BEnd; ++B) { 6839 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6840 ExceptSpec.CalledDecl( 6841 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6842 } 6843 6844 // Field destructors. 6845 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6846 FEnd = ClassDecl->field_end(); 6847 F != FEnd; ++F) { 6848 if (const RecordType *RecordTy 6849 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6850 ExceptSpec.CalledDecl( 6851 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6852 } 6853 6854 return ExceptSpec; 6855} 6856 6857CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6858 // C++ [class.dtor]p2: 6859 // If a class has no user-declared destructor, a destructor is 6860 // declared implicitly. An implicitly-declared destructor is an 6861 // inline public member of its class. 6862 6863 ImplicitExceptionSpecification Spec = 6864 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6865 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6866 6867 // Create the actual destructor declaration. 6868 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6869 6870 CanQualType ClassType 6871 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6872 SourceLocation ClassLoc = ClassDecl->getLocation(); 6873 DeclarationName Name 6874 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6875 DeclarationNameInfo NameInfo(Name, ClassLoc); 6876 CXXDestructorDecl *Destructor 6877 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6878 /*isInline=*/true, 6879 /*isImplicitlyDeclared=*/true); 6880 Destructor->setAccess(AS_public); 6881 Destructor->setDefaulted(); 6882 Destructor->setImplicit(); 6883 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6884 6885 // Note that we have declared this destructor. 6886 ++ASTContext::NumImplicitDestructorsDeclared; 6887 6888 // Introduce this destructor into its scope. 6889 if (Scope *S = getScopeForContext(ClassDecl)) 6890 PushOnScopeChains(Destructor, S, false); 6891 ClassDecl->addDecl(Destructor); 6892 6893 // This could be uniqued if it ever proves significant. 6894 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6895 6896 if (ShouldDeleteDestructor(Destructor)) 6897 Destructor->setDeletedAsWritten(); 6898 6899 AddOverriddenMethods(ClassDecl, Destructor); 6900 6901 return Destructor; 6902} 6903 6904void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6905 CXXDestructorDecl *Destructor) { 6906 assert((Destructor->isDefaulted() && 6907 !Destructor->doesThisDeclarationHaveABody()) && 6908 "DefineImplicitDestructor - call it for implicit default dtor"); 6909 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6910 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6911 6912 if (Destructor->isInvalidDecl()) 6913 return; 6914 6915 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6916 6917 DiagnosticErrorTrap Trap(Diags); 6918 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6919 Destructor->getParent()); 6920 6921 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6922 Diag(CurrentLocation, diag::note_member_synthesized_at) 6923 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6924 6925 Destructor->setInvalidDecl(); 6926 return; 6927 } 6928 6929 SourceLocation Loc = Destructor->getLocation(); 6930 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6931 6932 Destructor->setUsed(); 6933 MarkVTableUsed(CurrentLocation, ClassDecl); 6934 6935 if (ASTMutationListener *L = getASTMutationListener()) { 6936 L->CompletedImplicitDefinition(Destructor); 6937 } 6938} 6939 6940void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6941 CXXDestructorDecl *destructor) { 6942 // C++11 [class.dtor]p3: 6943 // A declaration of a destructor that does not have an exception- 6944 // specification is implicitly considered to have the same exception- 6945 // specification as an implicit declaration. 6946 const FunctionProtoType *dtorType = destructor->getType()-> 6947 getAs<FunctionProtoType>(); 6948 if (dtorType->hasExceptionSpec()) 6949 return; 6950 6951 ImplicitExceptionSpecification exceptSpec = 6952 ComputeDefaultedDtorExceptionSpec(classDecl); 6953 6954 // Replace the destructor's type. 6955 FunctionProtoType::ExtProtoInfo epi; 6956 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6957 epi.NumExceptions = exceptSpec.size(); 6958 epi.Exceptions = exceptSpec.data(); 6959 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6960 6961 destructor->setType(ty); 6962 6963 // FIXME: If the destructor has a body that could throw, and the newly created 6964 // spec doesn't allow exceptions, we should emit a warning, because this 6965 // change in behavior can break conforming C++03 programs at runtime. 6966 // However, we don't have a body yet, so it needs to be done somewhere else. 6967} 6968 6969/// \brief Builds a statement that copies/moves the given entity from \p From to 6970/// \c To. 6971/// 6972/// This routine is used to copy/move the members of a class with an 6973/// implicitly-declared copy/move assignment operator. When the entities being 6974/// copied are arrays, this routine builds for loops to copy them. 6975/// 6976/// \param S The Sema object used for type-checking. 6977/// 6978/// \param Loc The location where the implicit copy/move is being generated. 6979/// 6980/// \param T The type of the expressions being copied/moved. Both expressions 6981/// must have this type. 6982/// 6983/// \param To The expression we are copying/moving to. 6984/// 6985/// \param From The expression we are copying/moving from. 6986/// 6987/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 6988/// Otherwise, it's a non-static member subobject. 6989/// 6990/// \param Copying Whether we're copying or moving. 6991/// 6992/// \param Depth Internal parameter recording the depth of the recursion. 6993/// 6994/// \returns A statement or a loop that copies the expressions. 6995static StmtResult 6996BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6997 Expr *To, Expr *From, 6998 bool CopyingBaseSubobject, bool Copying, 6999 unsigned Depth = 0) { 7000 // C++0x [class.copy]p28: 7001 // Each subobject is assigned in the manner appropriate to its type: 7002 // 7003 // - if the subobject is of class type, as if by a call to operator= with 7004 // the subobject as the object expression and the corresponding 7005 // subobject of x as a single function argument (as if by explicit 7006 // qualification; that is, ignoring any possible virtual overriding 7007 // functions in more derived classes); 7008 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7009 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7010 7011 // Look for operator=. 7012 DeclarationName Name 7013 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7014 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7015 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7016 7017 // Filter out any result that isn't a copy/move-assignment operator. 7018 LookupResult::Filter F = OpLookup.makeFilter(); 7019 while (F.hasNext()) { 7020 NamedDecl *D = F.next(); 7021 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7022 if (Copying ? Method->isCopyAssignmentOperator() : 7023 Method->isMoveAssignmentOperator()) 7024 continue; 7025 7026 F.erase(); 7027 } 7028 F.done(); 7029 7030 // Suppress the protected check (C++ [class.protected]) for each of the 7031 // assignment operators we found. This strange dance is required when 7032 // we're assigning via a base classes's copy-assignment operator. To 7033 // ensure that we're getting the right base class subobject (without 7034 // ambiguities), we need to cast "this" to that subobject type; to 7035 // ensure that we don't go through the virtual call mechanism, we need 7036 // to qualify the operator= name with the base class (see below). However, 7037 // this means that if the base class has a protected copy assignment 7038 // operator, the protected member access check will fail. So, we 7039 // rewrite "protected" access to "public" access in this case, since we 7040 // know by construction that we're calling from a derived class. 7041 if (CopyingBaseSubobject) { 7042 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7043 L != LEnd; ++L) { 7044 if (L.getAccess() == AS_protected) 7045 L.setAccess(AS_public); 7046 } 7047 } 7048 7049 // Create the nested-name-specifier that will be used to qualify the 7050 // reference to operator=; this is required to suppress the virtual 7051 // call mechanism. 7052 CXXScopeSpec SS; 7053 SS.MakeTrivial(S.Context, 7054 NestedNameSpecifier::Create(S.Context, 0, false, 7055 T.getTypePtr()), 7056 Loc); 7057 7058 // Create the reference to operator=. 7059 ExprResult OpEqualRef 7060 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7061 /*FirstQualifierInScope=*/0, OpLookup, 7062 /*TemplateArgs=*/0, 7063 /*SuppressQualifierCheck=*/true); 7064 if (OpEqualRef.isInvalid()) 7065 return StmtError(); 7066 7067 // Build the call to the assignment operator. 7068 7069 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7070 OpEqualRef.takeAs<Expr>(), 7071 Loc, &From, 1, Loc); 7072 if (Call.isInvalid()) 7073 return StmtError(); 7074 7075 return S.Owned(Call.takeAs<Stmt>()); 7076 } 7077 7078 // - if the subobject is of scalar type, the built-in assignment 7079 // operator is used. 7080 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7081 if (!ArrayTy) { 7082 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7083 if (Assignment.isInvalid()) 7084 return StmtError(); 7085 7086 return S.Owned(Assignment.takeAs<Stmt>()); 7087 } 7088 7089 // - if the subobject is an array, each element is assigned, in the 7090 // manner appropriate to the element type; 7091 7092 // Construct a loop over the array bounds, e.g., 7093 // 7094 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7095 // 7096 // that will copy each of the array elements. 7097 QualType SizeType = S.Context.getSizeType(); 7098 7099 // Create the iteration variable. 7100 IdentifierInfo *IterationVarName = 0; 7101 { 7102 llvm::SmallString<8> Str; 7103 llvm::raw_svector_ostream OS(Str); 7104 OS << "__i" << Depth; 7105 IterationVarName = &S.Context.Idents.get(OS.str()); 7106 } 7107 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7108 IterationVarName, SizeType, 7109 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7110 SC_None, SC_None); 7111 7112 // Initialize the iteration variable to zero. 7113 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7114 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7115 7116 // Create a reference to the iteration variable; we'll use this several 7117 // times throughout. 7118 Expr *IterationVarRef 7119 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7120 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7121 7122 // Create the DeclStmt that holds the iteration variable. 7123 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7124 7125 // Create the comparison against the array bound. 7126 llvm::APInt Upper 7127 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7128 Expr *Comparison 7129 = new (S.Context) BinaryOperator(IterationVarRef, 7130 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7131 BO_NE, S.Context.BoolTy, 7132 VK_RValue, OK_Ordinary, Loc); 7133 7134 // Create the pre-increment of the iteration variable. 7135 Expr *Increment 7136 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7137 VK_LValue, OK_Ordinary, Loc); 7138 7139 // Subscript the "from" and "to" expressions with the iteration variable. 7140 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7141 IterationVarRef, Loc)); 7142 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7143 IterationVarRef, Loc)); 7144 if (!Copying) // Cast to rvalue 7145 From = CastForMoving(S, From); 7146 7147 // Build the copy/move for an individual element of the array. 7148 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7149 To, From, CopyingBaseSubobject, 7150 Copying, Depth + 1); 7151 if (Copy.isInvalid()) 7152 return StmtError(); 7153 7154 // Construct the loop that copies all elements of this array. 7155 return S.ActOnForStmt(Loc, Loc, InitStmt, 7156 S.MakeFullExpr(Comparison), 7157 0, S.MakeFullExpr(Increment), 7158 Loc, Copy.take()); 7159} 7160 7161std::pair<Sema::ImplicitExceptionSpecification, bool> 7162Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7163 CXXRecordDecl *ClassDecl) { 7164 if (ClassDecl->isInvalidDecl()) 7165 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7166 7167 // C++ [class.copy]p10: 7168 // If the class definition does not explicitly declare a copy 7169 // assignment operator, one is declared implicitly. 7170 // The implicitly-defined copy assignment operator for a class X 7171 // will have the form 7172 // 7173 // X& X::operator=(const X&) 7174 // 7175 // if 7176 bool HasConstCopyAssignment = true; 7177 7178 // -- each direct base class B of X has a copy assignment operator 7179 // whose parameter is of type const B&, const volatile B& or B, 7180 // and 7181 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7182 BaseEnd = ClassDecl->bases_end(); 7183 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7184 // We'll handle this below 7185 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7186 continue; 7187 7188 assert(!Base->getType()->isDependentType() && 7189 "Cannot generate implicit members for class with dependent bases."); 7190 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7191 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7192 &HasConstCopyAssignment); 7193 } 7194 7195 // In C++0x, the above citation has "or virtual added" 7196 if (LangOpts.CPlusPlus0x) { 7197 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7198 BaseEnd = ClassDecl->vbases_end(); 7199 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7200 assert(!Base->getType()->isDependentType() && 7201 "Cannot generate implicit members for class with dependent bases."); 7202 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7203 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7204 &HasConstCopyAssignment); 7205 } 7206 } 7207 7208 // -- for all the nonstatic data members of X that are of a class 7209 // type M (or array thereof), each such class type has a copy 7210 // assignment operator whose parameter is of type const M&, 7211 // const volatile M& or M. 7212 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7213 FieldEnd = ClassDecl->field_end(); 7214 HasConstCopyAssignment && Field != FieldEnd; 7215 ++Field) { 7216 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7217 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7218 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7219 &HasConstCopyAssignment); 7220 } 7221 } 7222 7223 // Otherwise, the implicitly declared copy assignment operator will 7224 // have the form 7225 // 7226 // X& X::operator=(X&) 7227 7228 // C++ [except.spec]p14: 7229 // An implicitly declared special member function (Clause 12) shall have an 7230 // exception-specification. [...] 7231 7232 // It is unspecified whether or not an implicit copy assignment operator 7233 // attempts to deduplicate calls to assignment operators of virtual bases are 7234 // made. As such, this exception specification is effectively unspecified. 7235 // Based on a similar decision made for constness in C++0x, we're erring on 7236 // the side of assuming such calls to be made regardless of whether they 7237 // actually happen. 7238 ImplicitExceptionSpecification ExceptSpec(Context); 7239 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7240 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7241 BaseEnd = ClassDecl->bases_end(); 7242 Base != BaseEnd; ++Base) { 7243 if (Base->isVirtual()) 7244 continue; 7245 7246 CXXRecordDecl *BaseClassDecl 7247 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7248 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7249 ArgQuals, false, 0)) 7250 ExceptSpec.CalledDecl(CopyAssign); 7251 } 7252 7253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7254 BaseEnd = ClassDecl->vbases_end(); 7255 Base != BaseEnd; ++Base) { 7256 CXXRecordDecl *BaseClassDecl 7257 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7258 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7259 ArgQuals, false, 0)) 7260 ExceptSpec.CalledDecl(CopyAssign); 7261 } 7262 7263 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7264 FieldEnd = ClassDecl->field_end(); 7265 Field != FieldEnd; 7266 ++Field) { 7267 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7268 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7269 if (CXXMethodDecl *CopyAssign = 7270 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7271 ExceptSpec.CalledDecl(CopyAssign); 7272 } 7273 } 7274 7275 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7276} 7277 7278CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7279 // Note: The following rules are largely analoguous to the copy 7280 // constructor rules. Note that virtual bases are not taken into account 7281 // for determining the argument type of the operator. Note also that 7282 // operators taking an object instead of a reference are allowed. 7283 7284 ImplicitExceptionSpecification Spec(Context); 7285 bool Const; 7286 llvm::tie(Spec, Const) = 7287 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7288 7289 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7290 QualType RetType = Context.getLValueReferenceType(ArgType); 7291 if (Const) 7292 ArgType = ArgType.withConst(); 7293 ArgType = Context.getLValueReferenceType(ArgType); 7294 7295 // An implicitly-declared copy assignment operator is an inline public 7296 // member of its class. 7297 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7298 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7299 SourceLocation ClassLoc = ClassDecl->getLocation(); 7300 DeclarationNameInfo NameInfo(Name, ClassLoc); 7301 CXXMethodDecl *CopyAssignment 7302 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7303 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7304 /*TInfo=*/0, /*isStatic=*/false, 7305 /*StorageClassAsWritten=*/SC_None, 7306 /*isInline=*/true, /*isConstexpr=*/false, 7307 SourceLocation()); 7308 CopyAssignment->setAccess(AS_public); 7309 CopyAssignment->setDefaulted(); 7310 CopyAssignment->setImplicit(); 7311 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7312 7313 // Add the parameter to the operator. 7314 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7315 ClassLoc, ClassLoc, /*Id=*/0, 7316 ArgType, /*TInfo=*/0, 7317 SC_None, 7318 SC_None, 0); 7319 CopyAssignment->setParams(&FromParam, 1); 7320 7321 // Note that we have added this copy-assignment operator. 7322 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7323 7324 if (Scope *S = getScopeForContext(ClassDecl)) 7325 PushOnScopeChains(CopyAssignment, S, false); 7326 ClassDecl->addDecl(CopyAssignment); 7327 7328 // C++0x [class.copy]p18: 7329 // ... If the class definition declares a move constructor or move 7330 // assignment operator, the implicitly declared copy assignment operator is 7331 // defined as deleted; ... 7332 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7333 ClassDecl->hasUserDeclaredMoveAssignment() || 7334 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7335 CopyAssignment->setDeletedAsWritten(); 7336 7337 AddOverriddenMethods(ClassDecl, CopyAssignment); 7338 return CopyAssignment; 7339} 7340 7341void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7342 CXXMethodDecl *CopyAssignOperator) { 7343 assert((CopyAssignOperator->isDefaulted() && 7344 CopyAssignOperator->isOverloadedOperator() && 7345 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7346 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7347 "DefineImplicitCopyAssignment called for wrong function"); 7348 7349 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7350 7351 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7352 CopyAssignOperator->setInvalidDecl(); 7353 return; 7354 } 7355 7356 CopyAssignOperator->setUsed(); 7357 7358 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7359 DiagnosticErrorTrap Trap(Diags); 7360 7361 // C++0x [class.copy]p30: 7362 // The implicitly-defined or explicitly-defaulted copy assignment operator 7363 // for a non-union class X performs memberwise copy assignment of its 7364 // subobjects. The direct base classes of X are assigned first, in the 7365 // order of their declaration in the base-specifier-list, and then the 7366 // immediate non-static data members of X are assigned, in the order in 7367 // which they were declared in the class definition. 7368 7369 // The statements that form the synthesized function body. 7370 ASTOwningVector<Stmt*> Statements(*this); 7371 7372 // The parameter for the "other" object, which we are copying from. 7373 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7374 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7375 QualType OtherRefType = Other->getType(); 7376 if (const LValueReferenceType *OtherRef 7377 = OtherRefType->getAs<LValueReferenceType>()) { 7378 OtherRefType = OtherRef->getPointeeType(); 7379 OtherQuals = OtherRefType.getQualifiers(); 7380 } 7381 7382 // Our location for everything implicitly-generated. 7383 SourceLocation Loc = CopyAssignOperator->getLocation(); 7384 7385 // Construct a reference to the "other" object. We'll be using this 7386 // throughout the generated ASTs. 7387 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7388 assert(OtherRef && "Reference to parameter cannot fail!"); 7389 7390 // Construct the "this" pointer. We'll be using this throughout the generated 7391 // ASTs. 7392 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7393 assert(This && "Reference to this cannot fail!"); 7394 7395 // Assign base classes. 7396 bool Invalid = false; 7397 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7398 E = ClassDecl->bases_end(); Base != E; ++Base) { 7399 // Form the assignment: 7400 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7401 QualType BaseType = Base->getType().getUnqualifiedType(); 7402 if (!BaseType->isRecordType()) { 7403 Invalid = true; 7404 continue; 7405 } 7406 7407 CXXCastPath BasePath; 7408 BasePath.push_back(Base); 7409 7410 // Construct the "from" expression, which is an implicit cast to the 7411 // appropriately-qualified base type. 7412 Expr *From = OtherRef; 7413 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7414 CK_UncheckedDerivedToBase, 7415 VK_LValue, &BasePath).take(); 7416 7417 // Dereference "this". 7418 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7419 7420 // Implicitly cast "this" to the appropriately-qualified base type. 7421 To = ImpCastExprToType(To.take(), 7422 Context.getCVRQualifiedType(BaseType, 7423 CopyAssignOperator->getTypeQualifiers()), 7424 CK_UncheckedDerivedToBase, 7425 VK_LValue, &BasePath); 7426 7427 // Build the copy. 7428 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7429 To.get(), From, 7430 /*CopyingBaseSubobject=*/true, 7431 /*Copying=*/true); 7432 if (Copy.isInvalid()) { 7433 Diag(CurrentLocation, diag::note_member_synthesized_at) 7434 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7435 CopyAssignOperator->setInvalidDecl(); 7436 return; 7437 } 7438 7439 // Success! Record the copy. 7440 Statements.push_back(Copy.takeAs<Expr>()); 7441 } 7442 7443 // \brief Reference to the __builtin_memcpy function. 7444 Expr *BuiltinMemCpyRef = 0; 7445 // \brief Reference to the __builtin_objc_memmove_collectable function. 7446 Expr *CollectableMemCpyRef = 0; 7447 7448 // Assign non-static members. 7449 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7450 FieldEnd = ClassDecl->field_end(); 7451 Field != FieldEnd; ++Field) { 7452 // Check for members of reference type; we can't copy those. 7453 if (Field->getType()->isReferenceType()) { 7454 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7455 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7456 Diag(Field->getLocation(), diag::note_declared_at); 7457 Diag(CurrentLocation, diag::note_member_synthesized_at) 7458 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7459 Invalid = true; 7460 continue; 7461 } 7462 7463 // Check for members of const-qualified, non-class type. 7464 QualType BaseType = Context.getBaseElementType(Field->getType()); 7465 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7466 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7467 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7468 Diag(Field->getLocation(), diag::note_declared_at); 7469 Diag(CurrentLocation, diag::note_member_synthesized_at) 7470 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7471 Invalid = true; 7472 continue; 7473 } 7474 7475 // Suppress assigning zero-width bitfields. 7476 if (const Expr *Width = Field->getBitWidth()) 7477 if (Width->EvaluateAsInt(Context) == 0) 7478 continue; 7479 7480 QualType FieldType = Field->getType().getNonReferenceType(); 7481 if (FieldType->isIncompleteArrayType()) { 7482 assert(ClassDecl->hasFlexibleArrayMember() && 7483 "Incomplete array type is not valid"); 7484 continue; 7485 } 7486 7487 // Build references to the field in the object we're copying from and to. 7488 CXXScopeSpec SS; // Intentionally empty 7489 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7490 LookupMemberName); 7491 MemberLookup.addDecl(*Field); 7492 MemberLookup.resolveKind(); 7493 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7494 Loc, /*IsArrow=*/false, 7495 SS, 0, MemberLookup, 0); 7496 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7497 Loc, /*IsArrow=*/true, 7498 SS, 0, MemberLookup, 0); 7499 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7500 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7501 7502 // If the field should be copied with __builtin_memcpy rather than via 7503 // explicit assignments, do so. This optimization only applies for arrays 7504 // of scalars and arrays of class type with trivial copy-assignment 7505 // operators. 7506 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7507 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7508 // Compute the size of the memory buffer to be copied. 7509 QualType SizeType = Context.getSizeType(); 7510 llvm::APInt Size(Context.getTypeSize(SizeType), 7511 Context.getTypeSizeInChars(BaseType).getQuantity()); 7512 for (const ConstantArrayType *Array 7513 = Context.getAsConstantArrayType(FieldType); 7514 Array; 7515 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7516 llvm::APInt ArraySize 7517 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7518 Size *= ArraySize; 7519 } 7520 7521 // Take the address of the field references for "from" and "to". 7522 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7523 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7524 7525 bool NeedsCollectableMemCpy = 7526 (BaseType->isRecordType() && 7527 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7528 7529 if (NeedsCollectableMemCpy) { 7530 if (!CollectableMemCpyRef) { 7531 // Create a reference to the __builtin_objc_memmove_collectable function. 7532 LookupResult R(*this, 7533 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7534 Loc, LookupOrdinaryName); 7535 LookupName(R, TUScope, true); 7536 7537 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7538 if (!CollectableMemCpy) { 7539 // Something went horribly wrong earlier, and we will have 7540 // complained about it. 7541 Invalid = true; 7542 continue; 7543 } 7544 7545 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7546 CollectableMemCpy->getType(), 7547 VK_LValue, Loc, 0).take(); 7548 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7549 } 7550 } 7551 // Create a reference to the __builtin_memcpy builtin function. 7552 else if (!BuiltinMemCpyRef) { 7553 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7554 LookupOrdinaryName); 7555 LookupName(R, TUScope, true); 7556 7557 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7558 if (!BuiltinMemCpy) { 7559 // Something went horribly wrong earlier, and we will have complained 7560 // about it. 7561 Invalid = true; 7562 continue; 7563 } 7564 7565 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7566 BuiltinMemCpy->getType(), 7567 VK_LValue, Loc, 0).take(); 7568 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7569 } 7570 7571 ASTOwningVector<Expr*> CallArgs(*this); 7572 CallArgs.push_back(To.takeAs<Expr>()); 7573 CallArgs.push_back(From.takeAs<Expr>()); 7574 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7575 ExprResult Call = ExprError(); 7576 if (NeedsCollectableMemCpy) 7577 Call = ActOnCallExpr(/*Scope=*/0, 7578 CollectableMemCpyRef, 7579 Loc, move_arg(CallArgs), 7580 Loc); 7581 else 7582 Call = ActOnCallExpr(/*Scope=*/0, 7583 BuiltinMemCpyRef, 7584 Loc, move_arg(CallArgs), 7585 Loc); 7586 7587 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7588 Statements.push_back(Call.takeAs<Expr>()); 7589 continue; 7590 } 7591 7592 // Build the copy of this field. 7593 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7594 To.get(), From.get(), 7595 /*CopyingBaseSubobject=*/false, 7596 /*Copying=*/true); 7597 if (Copy.isInvalid()) { 7598 Diag(CurrentLocation, diag::note_member_synthesized_at) 7599 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7600 CopyAssignOperator->setInvalidDecl(); 7601 return; 7602 } 7603 7604 // Success! Record the copy. 7605 Statements.push_back(Copy.takeAs<Stmt>()); 7606 } 7607 7608 if (!Invalid) { 7609 // Add a "return *this;" 7610 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7611 7612 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7613 if (Return.isInvalid()) 7614 Invalid = true; 7615 else { 7616 Statements.push_back(Return.takeAs<Stmt>()); 7617 7618 if (Trap.hasErrorOccurred()) { 7619 Diag(CurrentLocation, diag::note_member_synthesized_at) 7620 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7621 Invalid = true; 7622 } 7623 } 7624 } 7625 7626 if (Invalid) { 7627 CopyAssignOperator->setInvalidDecl(); 7628 return; 7629 } 7630 7631 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7632 /*isStmtExpr=*/false); 7633 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7634 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7635 7636 if (ASTMutationListener *L = getASTMutationListener()) { 7637 L->CompletedImplicitDefinition(CopyAssignOperator); 7638 } 7639} 7640 7641Sema::ImplicitExceptionSpecification 7642Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7643 ImplicitExceptionSpecification ExceptSpec(Context); 7644 7645 if (ClassDecl->isInvalidDecl()) 7646 return ExceptSpec; 7647 7648 // C++0x [except.spec]p14: 7649 // An implicitly declared special member function (Clause 12) shall have an 7650 // exception-specification. [...] 7651 7652 // It is unspecified whether or not an implicit move assignment operator 7653 // attempts to deduplicate calls to assignment operators of virtual bases are 7654 // made. As such, this exception specification is effectively unspecified. 7655 // Based on a similar decision made for constness in C++0x, we're erring on 7656 // the side of assuming such calls to be made regardless of whether they 7657 // actually happen. 7658 // Note that a move constructor is not implicitly declared when there are 7659 // virtual bases, but it can still be user-declared and explicitly defaulted. 7660 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7661 BaseEnd = ClassDecl->bases_end(); 7662 Base != BaseEnd; ++Base) { 7663 if (Base->isVirtual()) 7664 continue; 7665 7666 CXXRecordDecl *BaseClassDecl 7667 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7668 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7669 false, 0)) 7670 ExceptSpec.CalledDecl(MoveAssign); 7671 } 7672 7673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7674 BaseEnd = ClassDecl->vbases_end(); 7675 Base != BaseEnd; ++Base) { 7676 CXXRecordDecl *BaseClassDecl 7677 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7678 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7679 false, 0)) 7680 ExceptSpec.CalledDecl(MoveAssign); 7681 } 7682 7683 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7684 FieldEnd = ClassDecl->field_end(); 7685 Field != FieldEnd; 7686 ++Field) { 7687 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7688 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7689 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7690 false, 0)) 7691 ExceptSpec.CalledDecl(MoveAssign); 7692 } 7693 } 7694 7695 return ExceptSpec; 7696} 7697 7698CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7699 // Note: The following rules are largely analoguous to the move 7700 // constructor rules. 7701 7702 ImplicitExceptionSpecification Spec( 7703 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7704 7705 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7706 QualType RetType = Context.getLValueReferenceType(ArgType); 7707 ArgType = Context.getRValueReferenceType(ArgType); 7708 7709 // An implicitly-declared move assignment operator is an inline public 7710 // member of its class. 7711 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7712 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7713 SourceLocation ClassLoc = ClassDecl->getLocation(); 7714 DeclarationNameInfo NameInfo(Name, ClassLoc); 7715 CXXMethodDecl *MoveAssignment 7716 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7717 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7718 /*TInfo=*/0, /*isStatic=*/false, 7719 /*StorageClassAsWritten=*/SC_None, 7720 /*isInline=*/true, 7721 /*isConstexpr=*/false, 7722 SourceLocation()); 7723 MoveAssignment->setAccess(AS_public); 7724 MoveAssignment->setDefaulted(); 7725 MoveAssignment->setImplicit(); 7726 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7727 7728 // Add the parameter to the operator. 7729 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7730 ClassLoc, ClassLoc, /*Id=*/0, 7731 ArgType, /*TInfo=*/0, 7732 SC_None, 7733 SC_None, 0); 7734 MoveAssignment->setParams(&FromParam, 1); 7735 7736 // Note that we have added this copy-assignment operator. 7737 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7738 7739 // C++0x [class.copy]p9: 7740 // If the definition of a class X does not explicitly declare a move 7741 // assignment operator, one will be implicitly declared as defaulted if and 7742 // only if: 7743 // [...] 7744 // - the move assignment operator would not be implicitly defined as 7745 // deleted. 7746 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7747 // Cache this result so that we don't try to generate this over and over 7748 // on every lookup, leaking memory and wasting time. 7749 ClassDecl->setFailedImplicitMoveAssignment(); 7750 return 0; 7751 } 7752 7753 if (Scope *S = getScopeForContext(ClassDecl)) 7754 PushOnScopeChains(MoveAssignment, S, false); 7755 ClassDecl->addDecl(MoveAssignment); 7756 7757 AddOverriddenMethods(ClassDecl, MoveAssignment); 7758 return MoveAssignment; 7759} 7760 7761void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 7762 CXXMethodDecl *MoveAssignOperator) { 7763 assert((MoveAssignOperator->isDefaulted() && 7764 MoveAssignOperator->isOverloadedOperator() && 7765 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 7766 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 7767 "DefineImplicitMoveAssignment called for wrong function"); 7768 7769 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 7770 7771 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 7772 MoveAssignOperator->setInvalidDecl(); 7773 return; 7774 } 7775 7776 MoveAssignOperator->setUsed(); 7777 7778 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 7779 DiagnosticErrorTrap Trap(Diags); 7780 7781 // C++0x [class.copy]p28: 7782 // The implicitly-defined or move assignment operator for a non-union class 7783 // X performs memberwise move assignment of its subobjects. The direct base 7784 // classes of X are assigned first, in the order of their declaration in the 7785 // base-specifier-list, and then the immediate non-static data members of X 7786 // are assigned, in the order in which they were declared in the class 7787 // definition. 7788 7789 // The statements that form the synthesized function body. 7790 ASTOwningVector<Stmt*> Statements(*this); 7791 7792 // The parameter for the "other" object, which we are move from. 7793 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 7794 QualType OtherRefType = Other->getType()-> 7795 getAs<RValueReferenceType>()->getPointeeType(); 7796 assert(OtherRefType.getQualifiers() == 0 && 7797 "Bad argument type of defaulted move assignment"); 7798 7799 // Our location for everything implicitly-generated. 7800 SourceLocation Loc = MoveAssignOperator->getLocation(); 7801 7802 // Construct a reference to the "other" object. We'll be using this 7803 // throughout the generated ASTs. 7804 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7805 assert(OtherRef && "Reference to parameter cannot fail!"); 7806 // Cast to rvalue. 7807 OtherRef = CastForMoving(*this, OtherRef); 7808 7809 // Construct the "this" pointer. We'll be using this throughout the generated 7810 // ASTs. 7811 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7812 assert(This && "Reference to this cannot fail!"); 7813 7814 // Assign base classes. 7815 bool Invalid = false; 7816 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7817 E = ClassDecl->bases_end(); Base != E; ++Base) { 7818 // Form the assignment: 7819 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 7820 QualType BaseType = Base->getType().getUnqualifiedType(); 7821 if (!BaseType->isRecordType()) { 7822 Invalid = true; 7823 continue; 7824 } 7825 7826 CXXCastPath BasePath; 7827 BasePath.push_back(Base); 7828 7829 // Construct the "from" expression, which is an implicit cast to the 7830 // appropriately-qualified base type. 7831 Expr *From = OtherRef; 7832 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 7833 VK_XValue, &BasePath).take(); 7834 7835 // Dereference "this". 7836 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7837 7838 // Implicitly cast "this" to the appropriately-qualified base type. 7839 To = ImpCastExprToType(To.take(), 7840 Context.getCVRQualifiedType(BaseType, 7841 MoveAssignOperator->getTypeQualifiers()), 7842 CK_UncheckedDerivedToBase, 7843 VK_LValue, &BasePath); 7844 7845 // Build the move. 7846 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 7847 To.get(), From, 7848 /*CopyingBaseSubobject=*/true, 7849 /*Copying=*/false); 7850 if (Move.isInvalid()) { 7851 Diag(CurrentLocation, diag::note_member_synthesized_at) 7852 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7853 MoveAssignOperator->setInvalidDecl(); 7854 return; 7855 } 7856 7857 // Success! Record the move. 7858 Statements.push_back(Move.takeAs<Expr>()); 7859 } 7860 7861 // \brief Reference to the __builtin_memcpy function. 7862 Expr *BuiltinMemCpyRef = 0; 7863 // \brief Reference to the __builtin_objc_memmove_collectable function. 7864 Expr *CollectableMemCpyRef = 0; 7865 7866 // Assign non-static members. 7867 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7868 FieldEnd = ClassDecl->field_end(); 7869 Field != FieldEnd; ++Field) { 7870 // Check for members of reference type; we can't move those. 7871 if (Field->getType()->isReferenceType()) { 7872 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7873 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7874 Diag(Field->getLocation(), diag::note_declared_at); 7875 Diag(CurrentLocation, diag::note_member_synthesized_at) 7876 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7877 Invalid = true; 7878 continue; 7879 } 7880 7881 // Check for members of const-qualified, non-class type. 7882 QualType BaseType = Context.getBaseElementType(Field->getType()); 7883 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7884 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7885 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7886 Diag(Field->getLocation(), diag::note_declared_at); 7887 Diag(CurrentLocation, diag::note_member_synthesized_at) 7888 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7889 Invalid = true; 7890 continue; 7891 } 7892 7893 // Suppress assigning zero-width bitfields. 7894 if (const Expr *Width = Field->getBitWidth()) 7895 if (Width->EvaluateAsInt(Context) == 0) 7896 continue; 7897 7898 QualType FieldType = Field->getType().getNonReferenceType(); 7899 if (FieldType->isIncompleteArrayType()) { 7900 assert(ClassDecl->hasFlexibleArrayMember() && 7901 "Incomplete array type is not valid"); 7902 continue; 7903 } 7904 7905 // Build references to the field in the object we're copying from and to. 7906 CXXScopeSpec SS; // Intentionally empty 7907 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7908 LookupMemberName); 7909 MemberLookup.addDecl(*Field); 7910 MemberLookup.resolveKind(); 7911 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7912 Loc, /*IsArrow=*/false, 7913 SS, 0, MemberLookup, 0); 7914 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7915 Loc, /*IsArrow=*/true, 7916 SS, 0, MemberLookup, 0); 7917 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7918 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7919 7920 assert(!From.get()->isLValue() && // could be xvalue or prvalue 7921 "Member reference with rvalue base must be rvalue except for reference " 7922 "members, which aren't allowed for move assignment."); 7923 7924 // If the field should be copied with __builtin_memcpy rather than via 7925 // explicit assignments, do so. This optimization only applies for arrays 7926 // of scalars and arrays of class type with trivial move-assignment 7927 // operators. 7928 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7929 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 7930 // Compute the size of the memory buffer to be copied. 7931 QualType SizeType = Context.getSizeType(); 7932 llvm::APInt Size(Context.getTypeSize(SizeType), 7933 Context.getTypeSizeInChars(BaseType).getQuantity()); 7934 for (const ConstantArrayType *Array 7935 = Context.getAsConstantArrayType(FieldType); 7936 Array; 7937 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7938 llvm::APInt ArraySize 7939 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7940 Size *= ArraySize; 7941 } 7942 7943 // Take the address of the field references for "from" and "to". We 7944 // directly construct UnaryOperators here because semantic analysis 7945 // does not permit us to take the address of an xvalue. 7946 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 7947 Context.getPointerType(From.get()->getType()), 7948 VK_RValue, OK_Ordinary, Loc); 7949 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 7950 Context.getPointerType(To.get()->getType()), 7951 VK_RValue, OK_Ordinary, Loc); 7952 7953 bool NeedsCollectableMemCpy = 7954 (BaseType->isRecordType() && 7955 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7956 7957 if (NeedsCollectableMemCpy) { 7958 if (!CollectableMemCpyRef) { 7959 // Create a reference to the __builtin_objc_memmove_collectable function. 7960 LookupResult R(*this, 7961 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7962 Loc, LookupOrdinaryName); 7963 LookupName(R, TUScope, true); 7964 7965 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7966 if (!CollectableMemCpy) { 7967 // Something went horribly wrong earlier, and we will have 7968 // complained about it. 7969 Invalid = true; 7970 continue; 7971 } 7972 7973 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7974 CollectableMemCpy->getType(), 7975 VK_LValue, Loc, 0).take(); 7976 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7977 } 7978 } 7979 // Create a reference to the __builtin_memcpy builtin function. 7980 else if (!BuiltinMemCpyRef) { 7981 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7982 LookupOrdinaryName); 7983 LookupName(R, TUScope, true); 7984 7985 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7986 if (!BuiltinMemCpy) { 7987 // Something went horribly wrong earlier, and we will have complained 7988 // about it. 7989 Invalid = true; 7990 continue; 7991 } 7992 7993 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7994 BuiltinMemCpy->getType(), 7995 VK_LValue, Loc, 0).take(); 7996 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7997 } 7998 7999 ASTOwningVector<Expr*> CallArgs(*this); 8000 CallArgs.push_back(To.takeAs<Expr>()); 8001 CallArgs.push_back(From.takeAs<Expr>()); 8002 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8003 ExprResult Call = ExprError(); 8004 if (NeedsCollectableMemCpy) 8005 Call = ActOnCallExpr(/*Scope=*/0, 8006 CollectableMemCpyRef, 8007 Loc, move_arg(CallArgs), 8008 Loc); 8009 else 8010 Call = ActOnCallExpr(/*Scope=*/0, 8011 BuiltinMemCpyRef, 8012 Loc, move_arg(CallArgs), 8013 Loc); 8014 8015 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8016 Statements.push_back(Call.takeAs<Expr>()); 8017 continue; 8018 } 8019 8020 // Build the move of this field. 8021 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8022 To.get(), From.get(), 8023 /*CopyingBaseSubobject=*/false, 8024 /*Copying=*/false); 8025 if (Move.isInvalid()) { 8026 Diag(CurrentLocation, diag::note_member_synthesized_at) 8027 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8028 MoveAssignOperator->setInvalidDecl(); 8029 return; 8030 } 8031 8032 // Success! Record the copy. 8033 Statements.push_back(Move.takeAs<Stmt>()); 8034 } 8035 8036 if (!Invalid) { 8037 // Add a "return *this;" 8038 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8039 8040 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8041 if (Return.isInvalid()) 8042 Invalid = true; 8043 else { 8044 Statements.push_back(Return.takeAs<Stmt>()); 8045 8046 if (Trap.hasErrorOccurred()) { 8047 Diag(CurrentLocation, diag::note_member_synthesized_at) 8048 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8049 Invalid = true; 8050 } 8051 } 8052 } 8053 8054 if (Invalid) { 8055 MoveAssignOperator->setInvalidDecl(); 8056 return; 8057 } 8058 8059 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8060 /*isStmtExpr=*/false); 8061 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8062 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8063 8064 if (ASTMutationListener *L = getASTMutationListener()) { 8065 L->CompletedImplicitDefinition(MoveAssignOperator); 8066 } 8067} 8068 8069std::pair<Sema::ImplicitExceptionSpecification, bool> 8070Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8071 if (ClassDecl->isInvalidDecl()) 8072 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8073 8074 // C++ [class.copy]p5: 8075 // The implicitly-declared copy constructor for a class X will 8076 // have the form 8077 // 8078 // X::X(const X&) 8079 // 8080 // if 8081 // FIXME: It ought to be possible to store this on the record. 8082 bool HasConstCopyConstructor = true; 8083 8084 // -- each direct or virtual base class B of X has a copy 8085 // constructor whose first parameter is of type const B& or 8086 // const volatile B&, and 8087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8088 BaseEnd = ClassDecl->bases_end(); 8089 HasConstCopyConstructor && Base != BaseEnd; 8090 ++Base) { 8091 // Virtual bases are handled below. 8092 if (Base->isVirtual()) 8093 continue; 8094 8095 CXXRecordDecl *BaseClassDecl 8096 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8097 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8098 &HasConstCopyConstructor); 8099 } 8100 8101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8102 BaseEnd = ClassDecl->vbases_end(); 8103 HasConstCopyConstructor && Base != BaseEnd; 8104 ++Base) { 8105 CXXRecordDecl *BaseClassDecl 8106 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8107 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8108 &HasConstCopyConstructor); 8109 } 8110 8111 // -- for all the nonstatic data members of X that are of a 8112 // class type M (or array thereof), each such class type 8113 // has a copy constructor whose first parameter is of type 8114 // const M& or const volatile M&. 8115 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8116 FieldEnd = ClassDecl->field_end(); 8117 HasConstCopyConstructor && Field != FieldEnd; 8118 ++Field) { 8119 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8120 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8121 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8122 &HasConstCopyConstructor); 8123 } 8124 } 8125 // Otherwise, the implicitly declared copy constructor will have 8126 // the form 8127 // 8128 // X::X(X&) 8129 8130 // C++ [except.spec]p14: 8131 // An implicitly declared special member function (Clause 12) shall have an 8132 // exception-specification. [...] 8133 ImplicitExceptionSpecification ExceptSpec(Context); 8134 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8135 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8136 BaseEnd = ClassDecl->bases_end(); 8137 Base != BaseEnd; 8138 ++Base) { 8139 // Virtual bases are handled below. 8140 if (Base->isVirtual()) 8141 continue; 8142 8143 CXXRecordDecl *BaseClassDecl 8144 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8145 if (CXXConstructorDecl *CopyConstructor = 8146 LookupCopyingConstructor(BaseClassDecl, Quals)) 8147 ExceptSpec.CalledDecl(CopyConstructor); 8148 } 8149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8150 BaseEnd = ClassDecl->vbases_end(); 8151 Base != BaseEnd; 8152 ++Base) { 8153 CXXRecordDecl *BaseClassDecl 8154 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8155 if (CXXConstructorDecl *CopyConstructor = 8156 LookupCopyingConstructor(BaseClassDecl, Quals)) 8157 ExceptSpec.CalledDecl(CopyConstructor); 8158 } 8159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8160 FieldEnd = ClassDecl->field_end(); 8161 Field != FieldEnd; 8162 ++Field) { 8163 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8165 if (CXXConstructorDecl *CopyConstructor = 8166 LookupCopyingConstructor(FieldClassDecl, Quals)) 8167 ExceptSpec.CalledDecl(CopyConstructor); 8168 } 8169 } 8170 8171 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8172} 8173 8174CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8175 CXXRecordDecl *ClassDecl) { 8176 // C++ [class.copy]p4: 8177 // If the class definition does not explicitly declare a copy 8178 // constructor, one is declared implicitly. 8179 8180 ImplicitExceptionSpecification Spec(Context); 8181 bool Const; 8182 llvm::tie(Spec, Const) = 8183 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8184 8185 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8186 QualType ArgType = ClassType; 8187 if (Const) 8188 ArgType = ArgType.withConst(); 8189 ArgType = Context.getLValueReferenceType(ArgType); 8190 8191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8192 8193 DeclarationName Name 8194 = Context.DeclarationNames.getCXXConstructorName( 8195 Context.getCanonicalType(ClassType)); 8196 SourceLocation ClassLoc = ClassDecl->getLocation(); 8197 DeclarationNameInfo NameInfo(Name, ClassLoc); 8198 8199 // An implicitly-declared copy constructor is an inline public 8200 // member of its class. 8201 CXXConstructorDecl *CopyConstructor 8202 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8203 Context.getFunctionType(Context.VoidTy, 8204 &ArgType, 1, EPI), 8205 /*TInfo=*/0, 8206 /*isExplicit=*/false, 8207 /*isInline=*/true, 8208 /*isImplicitlyDeclared=*/true, 8209 // FIXME: apply the rules for definitions here 8210 /*isConstexpr=*/false); 8211 CopyConstructor->setAccess(AS_public); 8212 CopyConstructor->setDefaulted(); 8213 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8214 8215 // Note that we have declared this constructor. 8216 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8217 8218 // Add the parameter to the constructor. 8219 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8220 ClassLoc, ClassLoc, 8221 /*IdentifierInfo=*/0, 8222 ArgType, /*TInfo=*/0, 8223 SC_None, 8224 SC_None, 0); 8225 CopyConstructor->setParams(&FromParam, 1); 8226 8227 if (Scope *S = getScopeForContext(ClassDecl)) 8228 PushOnScopeChains(CopyConstructor, S, false); 8229 ClassDecl->addDecl(CopyConstructor); 8230 8231 // C++0x [class.copy]p7: 8232 // ... If the class definition declares a move constructor or move 8233 // assignment operator, the implicitly declared constructor is defined as 8234 // deleted; ... 8235 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8236 ClassDecl->hasUserDeclaredMoveAssignment() || 8237 ShouldDeleteCopyConstructor(CopyConstructor)) 8238 CopyConstructor->setDeletedAsWritten(); 8239 8240 return CopyConstructor; 8241} 8242 8243void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8244 CXXConstructorDecl *CopyConstructor) { 8245 assert((CopyConstructor->isDefaulted() && 8246 CopyConstructor->isCopyConstructor() && 8247 !CopyConstructor->doesThisDeclarationHaveABody()) && 8248 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8249 8250 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8251 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8252 8253 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8254 DiagnosticErrorTrap Trap(Diags); 8255 8256 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8257 Trap.hasErrorOccurred()) { 8258 Diag(CurrentLocation, diag::note_member_synthesized_at) 8259 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8260 CopyConstructor->setInvalidDecl(); 8261 } else { 8262 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8263 CopyConstructor->getLocation(), 8264 MultiStmtArg(*this, 0, 0), 8265 /*isStmtExpr=*/false) 8266 .takeAs<Stmt>()); 8267 } 8268 8269 CopyConstructor->setUsed(); 8270 8271 if (ASTMutationListener *L = getASTMutationListener()) { 8272 L->CompletedImplicitDefinition(CopyConstructor); 8273 } 8274} 8275 8276Sema::ImplicitExceptionSpecification 8277Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8278 // C++ [except.spec]p14: 8279 // An implicitly declared special member function (Clause 12) shall have an 8280 // exception-specification. [...] 8281 ImplicitExceptionSpecification ExceptSpec(Context); 8282 if (ClassDecl->isInvalidDecl()) 8283 return ExceptSpec; 8284 8285 // Direct base-class constructors. 8286 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8287 BEnd = ClassDecl->bases_end(); 8288 B != BEnd; ++B) { 8289 if (B->isVirtual()) // Handled below. 8290 continue; 8291 8292 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8293 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8294 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8295 // If this is a deleted function, add it anyway. This might be conformant 8296 // with the standard. This might not. I'm not sure. It might not matter. 8297 if (Constructor) 8298 ExceptSpec.CalledDecl(Constructor); 8299 } 8300 } 8301 8302 // Virtual base-class constructors. 8303 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8304 BEnd = ClassDecl->vbases_end(); 8305 B != BEnd; ++B) { 8306 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8307 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8308 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8309 // If this is a deleted function, add it anyway. This might be conformant 8310 // with the standard. This might not. I'm not sure. It might not matter. 8311 if (Constructor) 8312 ExceptSpec.CalledDecl(Constructor); 8313 } 8314 } 8315 8316 // Field constructors. 8317 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8318 FEnd = ClassDecl->field_end(); 8319 F != FEnd; ++F) { 8320 if (F->hasInClassInitializer()) { 8321 if (Expr *E = F->getInClassInitializer()) 8322 ExceptSpec.CalledExpr(E); 8323 else if (!F->isInvalidDecl()) 8324 ExceptSpec.SetDelayed(); 8325 } else if (const RecordType *RecordTy 8326 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8327 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8328 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8329 // If this is a deleted function, add it anyway. This might be conformant 8330 // with the standard. This might not. I'm not sure. It might not matter. 8331 // In particular, the problem is that this function never gets called. It 8332 // might just be ill-formed because this function attempts to refer to 8333 // a deleted function here. 8334 if (Constructor) 8335 ExceptSpec.CalledDecl(Constructor); 8336 } 8337 } 8338 8339 return ExceptSpec; 8340} 8341 8342CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8343 CXXRecordDecl *ClassDecl) { 8344 ImplicitExceptionSpecification Spec( 8345 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8346 8347 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8348 QualType ArgType = Context.getRValueReferenceType(ClassType); 8349 8350 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8351 8352 DeclarationName Name 8353 = Context.DeclarationNames.getCXXConstructorName( 8354 Context.getCanonicalType(ClassType)); 8355 SourceLocation ClassLoc = ClassDecl->getLocation(); 8356 DeclarationNameInfo NameInfo(Name, ClassLoc); 8357 8358 // C++0x [class.copy]p11: 8359 // An implicitly-declared copy/move constructor is an inline public 8360 // member of its class. 8361 CXXConstructorDecl *MoveConstructor 8362 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8363 Context.getFunctionType(Context.VoidTy, 8364 &ArgType, 1, EPI), 8365 /*TInfo=*/0, 8366 /*isExplicit=*/false, 8367 /*isInline=*/true, 8368 /*isImplicitlyDeclared=*/true, 8369 // FIXME: apply the rules for definitions here 8370 /*isConstexpr=*/false); 8371 MoveConstructor->setAccess(AS_public); 8372 MoveConstructor->setDefaulted(); 8373 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8374 8375 // Add the parameter to the constructor. 8376 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8377 ClassLoc, ClassLoc, 8378 /*IdentifierInfo=*/0, 8379 ArgType, /*TInfo=*/0, 8380 SC_None, 8381 SC_None, 0); 8382 MoveConstructor->setParams(&FromParam, 1); 8383 8384 // C++0x [class.copy]p9: 8385 // If the definition of a class X does not explicitly declare a move 8386 // constructor, one will be implicitly declared as defaulted if and only if: 8387 // [...] 8388 // - the move constructor would not be implicitly defined as deleted. 8389 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8390 // Cache this result so that we don't try to generate this over and over 8391 // on every lookup, leaking memory and wasting time. 8392 ClassDecl->setFailedImplicitMoveConstructor(); 8393 return 0; 8394 } 8395 8396 // Note that we have declared this constructor. 8397 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8398 8399 if (Scope *S = getScopeForContext(ClassDecl)) 8400 PushOnScopeChains(MoveConstructor, S, false); 8401 ClassDecl->addDecl(MoveConstructor); 8402 8403 return MoveConstructor; 8404} 8405 8406void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8407 CXXConstructorDecl *MoveConstructor) { 8408 assert((MoveConstructor->isDefaulted() && 8409 MoveConstructor->isMoveConstructor() && 8410 !MoveConstructor->doesThisDeclarationHaveABody()) && 8411 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8412 8413 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8414 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8415 8416 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8417 DiagnosticErrorTrap Trap(Diags); 8418 8419 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8420 Trap.hasErrorOccurred()) { 8421 Diag(CurrentLocation, diag::note_member_synthesized_at) 8422 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8423 MoveConstructor->setInvalidDecl(); 8424 } else { 8425 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8426 MoveConstructor->getLocation(), 8427 MultiStmtArg(*this, 0, 0), 8428 /*isStmtExpr=*/false) 8429 .takeAs<Stmt>()); 8430 } 8431 8432 MoveConstructor->setUsed(); 8433 8434 if (ASTMutationListener *L = getASTMutationListener()) { 8435 L->CompletedImplicitDefinition(MoveConstructor); 8436 } 8437} 8438 8439ExprResult 8440Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8441 CXXConstructorDecl *Constructor, 8442 MultiExprArg ExprArgs, 8443 bool RequiresZeroInit, 8444 unsigned ConstructKind, 8445 SourceRange ParenRange) { 8446 bool Elidable = false; 8447 8448 // C++0x [class.copy]p34: 8449 // When certain criteria are met, an implementation is allowed to 8450 // omit the copy/move construction of a class object, even if the 8451 // copy/move constructor and/or destructor for the object have 8452 // side effects. [...] 8453 // - when a temporary class object that has not been bound to a 8454 // reference (12.2) would be copied/moved to a class object 8455 // with the same cv-unqualified type, the copy/move operation 8456 // can be omitted by constructing the temporary object 8457 // directly into the target of the omitted copy/move 8458 if (ConstructKind == CXXConstructExpr::CK_Complete && 8459 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8460 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8461 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8462 } 8463 8464 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8465 Elidable, move(ExprArgs), RequiresZeroInit, 8466 ConstructKind, ParenRange); 8467} 8468 8469/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8470/// including handling of its default argument expressions. 8471ExprResult 8472Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8473 CXXConstructorDecl *Constructor, bool Elidable, 8474 MultiExprArg ExprArgs, 8475 bool RequiresZeroInit, 8476 unsigned ConstructKind, 8477 SourceRange ParenRange) { 8478 unsigned NumExprs = ExprArgs.size(); 8479 Expr **Exprs = (Expr **)ExprArgs.release(); 8480 8481 for (specific_attr_iterator<NonNullAttr> 8482 i = Constructor->specific_attr_begin<NonNullAttr>(), 8483 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8484 const NonNullAttr *NonNull = *i; 8485 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8486 } 8487 8488 MarkDeclarationReferenced(ConstructLoc, Constructor); 8489 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8490 Constructor, Elidable, Exprs, NumExprs, 8491 RequiresZeroInit, 8492 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8493 ParenRange)); 8494} 8495 8496bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8497 CXXConstructorDecl *Constructor, 8498 MultiExprArg Exprs) { 8499 // FIXME: Provide the correct paren SourceRange when available. 8500 ExprResult TempResult = 8501 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8502 move(Exprs), false, CXXConstructExpr::CK_Complete, 8503 SourceRange()); 8504 if (TempResult.isInvalid()) 8505 return true; 8506 8507 Expr *Temp = TempResult.takeAs<Expr>(); 8508 CheckImplicitConversions(Temp, VD->getLocation()); 8509 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8510 Temp = MaybeCreateExprWithCleanups(Temp); 8511 VD->setInit(Temp); 8512 8513 return false; 8514} 8515 8516void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8517 if (VD->isInvalidDecl()) return; 8518 8519 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8520 if (ClassDecl->isInvalidDecl()) return; 8521 if (ClassDecl->hasTrivialDestructor()) return; 8522 if (ClassDecl->isDependentContext()) return; 8523 8524 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8525 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8526 CheckDestructorAccess(VD->getLocation(), Destructor, 8527 PDiag(diag::err_access_dtor_var) 8528 << VD->getDeclName() 8529 << VD->getType()); 8530 8531 if (!VD->hasGlobalStorage()) return; 8532 8533 // Emit warning for non-trivial dtor in global scope (a real global, 8534 // class-static, function-static). 8535 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8536 8537 // TODO: this should be re-enabled for static locals by !CXAAtExit 8538 if (!VD->isStaticLocal()) 8539 Diag(VD->getLocation(), diag::warn_global_destructor); 8540} 8541 8542/// AddCXXDirectInitializerToDecl - This action is called immediately after 8543/// ActOnDeclarator, when a C++ direct initializer is present. 8544/// e.g: "int x(1);" 8545void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8546 SourceLocation LParenLoc, 8547 MultiExprArg Exprs, 8548 SourceLocation RParenLoc, 8549 bool TypeMayContainAuto) { 8550 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8551 8552 // If there is no declaration, there was an error parsing it. Just ignore 8553 // the initializer. 8554 if (RealDecl == 0) 8555 return; 8556 8557 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8558 if (!VDecl) { 8559 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8560 RealDecl->setInvalidDecl(); 8561 return; 8562 } 8563 8564 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8565 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8566 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8567 if (Exprs.size() > 1) { 8568 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8569 diag::err_auto_var_init_multiple_expressions) 8570 << VDecl->getDeclName() << VDecl->getType() 8571 << VDecl->getSourceRange(); 8572 RealDecl->setInvalidDecl(); 8573 return; 8574 } 8575 8576 Expr *Init = Exprs.get()[0]; 8577 TypeSourceInfo *DeducedType = 0; 8578 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8579 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8580 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8581 << Init->getSourceRange(); 8582 if (!DeducedType) { 8583 RealDecl->setInvalidDecl(); 8584 return; 8585 } 8586 VDecl->setTypeSourceInfo(DeducedType); 8587 VDecl->setType(DeducedType->getType()); 8588 8589 // In ARC, infer lifetime. 8590 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8591 VDecl->setInvalidDecl(); 8592 8593 // If this is a redeclaration, check that the type we just deduced matches 8594 // the previously declared type. 8595 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8596 MergeVarDeclTypes(VDecl, Old); 8597 } 8598 8599 // We will represent direct-initialization similarly to copy-initialization: 8600 // int x(1); -as-> int x = 1; 8601 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8602 // 8603 // Clients that want to distinguish between the two forms, can check for 8604 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8605 // A major benefit is that clients that don't particularly care about which 8606 // exactly form was it (like the CodeGen) can handle both cases without 8607 // special case code. 8608 8609 // C++ 8.5p11: 8610 // The form of initialization (using parentheses or '=') is generally 8611 // insignificant, but does matter when the entity being initialized has a 8612 // class type. 8613 8614 if (!VDecl->getType()->isDependentType() && 8615 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8616 diag::err_typecheck_decl_incomplete_type)) { 8617 VDecl->setInvalidDecl(); 8618 return; 8619 } 8620 8621 // The variable can not have an abstract class type. 8622 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8623 diag::err_abstract_type_in_decl, 8624 AbstractVariableType)) 8625 VDecl->setInvalidDecl(); 8626 8627 const VarDecl *Def; 8628 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8629 Diag(VDecl->getLocation(), diag::err_redefinition) 8630 << VDecl->getDeclName(); 8631 Diag(Def->getLocation(), diag::note_previous_definition); 8632 VDecl->setInvalidDecl(); 8633 return; 8634 } 8635 8636 // C++ [class.static.data]p4 8637 // If a static data member is of const integral or const 8638 // enumeration type, its declaration in the class definition can 8639 // specify a constant-initializer which shall be an integral 8640 // constant expression (5.19). In that case, the member can appear 8641 // in integral constant expressions. The member shall still be 8642 // defined in a namespace scope if it is used in the program and the 8643 // namespace scope definition shall not contain an initializer. 8644 // 8645 // We already performed a redefinition check above, but for static 8646 // data members we also need to check whether there was an in-class 8647 // declaration with an initializer. 8648 const VarDecl* PrevInit = 0; 8649 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8650 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8651 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8652 return; 8653 } 8654 8655 bool IsDependent = false; 8656 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8657 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8658 VDecl->setInvalidDecl(); 8659 return; 8660 } 8661 8662 if (Exprs.get()[I]->isTypeDependent()) 8663 IsDependent = true; 8664 } 8665 8666 // If either the declaration has a dependent type or if any of the 8667 // expressions is type-dependent, we represent the initialization 8668 // via a ParenListExpr for later use during template instantiation. 8669 if (VDecl->getType()->isDependentType() || IsDependent) { 8670 // Let clients know that initialization was done with a direct initializer. 8671 VDecl->setCXXDirectInitializer(true); 8672 8673 // Store the initialization expressions as a ParenListExpr. 8674 unsigned NumExprs = Exprs.size(); 8675 VDecl->setInit(new (Context) ParenListExpr( 8676 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8677 VDecl->getType().getNonReferenceType())); 8678 return; 8679 } 8680 8681 // Capture the variable that is being initialized and the style of 8682 // initialization. 8683 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8684 8685 // FIXME: Poor source location information. 8686 InitializationKind Kind 8687 = InitializationKind::CreateDirect(VDecl->getLocation(), 8688 LParenLoc, RParenLoc); 8689 8690 InitializationSequence InitSeq(*this, Entity, Kind, 8691 Exprs.get(), Exprs.size()); 8692 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 8693 if (Result.isInvalid()) { 8694 VDecl->setInvalidDecl(); 8695 return; 8696 } 8697 8698 CheckImplicitConversions(Result.get(), LParenLoc); 8699 8700 Result = MaybeCreateExprWithCleanups(Result); 8701 VDecl->setInit(Result.takeAs<Expr>()); 8702 VDecl->setCXXDirectInitializer(true); 8703 8704 CheckCompleteVariableDeclaration(VDecl); 8705} 8706 8707/// \brief Given a constructor and the set of arguments provided for the 8708/// constructor, convert the arguments and add any required default arguments 8709/// to form a proper call to this constructor. 8710/// 8711/// \returns true if an error occurred, false otherwise. 8712bool 8713Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8714 MultiExprArg ArgsPtr, 8715 SourceLocation Loc, 8716 ASTOwningVector<Expr*> &ConvertedArgs) { 8717 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8718 unsigned NumArgs = ArgsPtr.size(); 8719 Expr **Args = (Expr **)ArgsPtr.get(); 8720 8721 const FunctionProtoType *Proto 8722 = Constructor->getType()->getAs<FunctionProtoType>(); 8723 assert(Proto && "Constructor without a prototype?"); 8724 unsigned NumArgsInProto = Proto->getNumArgs(); 8725 8726 // If too few arguments are available, we'll fill in the rest with defaults. 8727 if (NumArgs < NumArgsInProto) 8728 ConvertedArgs.reserve(NumArgsInProto); 8729 else 8730 ConvertedArgs.reserve(NumArgs); 8731 8732 VariadicCallType CallType = 8733 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8734 SmallVector<Expr *, 8> AllArgs; 8735 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8736 Proto, 0, Args, NumArgs, AllArgs, 8737 CallType); 8738 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 8739 ConvertedArgs.push_back(AllArgs[i]); 8740 return Invalid; 8741} 8742 8743static inline bool 8744CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8745 const FunctionDecl *FnDecl) { 8746 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8747 if (isa<NamespaceDecl>(DC)) { 8748 return SemaRef.Diag(FnDecl->getLocation(), 8749 diag::err_operator_new_delete_declared_in_namespace) 8750 << FnDecl->getDeclName(); 8751 } 8752 8753 if (isa<TranslationUnitDecl>(DC) && 8754 FnDecl->getStorageClass() == SC_Static) { 8755 return SemaRef.Diag(FnDecl->getLocation(), 8756 diag::err_operator_new_delete_declared_static) 8757 << FnDecl->getDeclName(); 8758 } 8759 8760 return false; 8761} 8762 8763static inline bool 8764CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8765 CanQualType ExpectedResultType, 8766 CanQualType ExpectedFirstParamType, 8767 unsigned DependentParamTypeDiag, 8768 unsigned InvalidParamTypeDiag) { 8769 QualType ResultType = 8770 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 8771 8772 // Check that the result type is not dependent. 8773 if (ResultType->isDependentType()) 8774 return SemaRef.Diag(FnDecl->getLocation(), 8775 diag::err_operator_new_delete_dependent_result_type) 8776 << FnDecl->getDeclName() << ExpectedResultType; 8777 8778 // Check that the result type is what we expect. 8779 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 8780 return SemaRef.Diag(FnDecl->getLocation(), 8781 diag::err_operator_new_delete_invalid_result_type) 8782 << FnDecl->getDeclName() << ExpectedResultType; 8783 8784 // A function template must have at least 2 parameters. 8785 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 8786 return SemaRef.Diag(FnDecl->getLocation(), 8787 diag::err_operator_new_delete_template_too_few_parameters) 8788 << FnDecl->getDeclName(); 8789 8790 // The function decl must have at least 1 parameter. 8791 if (FnDecl->getNumParams() == 0) 8792 return SemaRef.Diag(FnDecl->getLocation(), 8793 diag::err_operator_new_delete_too_few_parameters) 8794 << FnDecl->getDeclName(); 8795 8796 // Check the the first parameter type is not dependent. 8797 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 8798 if (FirstParamType->isDependentType()) 8799 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 8800 << FnDecl->getDeclName() << ExpectedFirstParamType; 8801 8802 // Check that the first parameter type is what we expect. 8803 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 8804 ExpectedFirstParamType) 8805 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 8806 << FnDecl->getDeclName() << ExpectedFirstParamType; 8807 8808 return false; 8809} 8810 8811static bool 8812CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8813 // C++ [basic.stc.dynamic.allocation]p1: 8814 // A program is ill-formed if an allocation function is declared in a 8815 // namespace scope other than global scope or declared static in global 8816 // scope. 8817 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8818 return true; 8819 8820 CanQualType SizeTy = 8821 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 8822 8823 // C++ [basic.stc.dynamic.allocation]p1: 8824 // The return type shall be void*. The first parameter shall have type 8825 // std::size_t. 8826 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 8827 SizeTy, 8828 diag::err_operator_new_dependent_param_type, 8829 diag::err_operator_new_param_type)) 8830 return true; 8831 8832 // C++ [basic.stc.dynamic.allocation]p1: 8833 // The first parameter shall not have an associated default argument. 8834 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 8835 return SemaRef.Diag(FnDecl->getLocation(), 8836 diag::err_operator_new_default_arg) 8837 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 8838 8839 return false; 8840} 8841 8842static bool 8843CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8844 // C++ [basic.stc.dynamic.deallocation]p1: 8845 // A program is ill-formed if deallocation functions are declared in a 8846 // namespace scope other than global scope or declared static in global 8847 // scope. 8848 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8849 return true; 8850 8851 // C++ [basic.stc.dynamic.deallocation]p2: 8852 // Each deallocation function shall return void and its first parameter 8853 // shall be void*. 8854 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 8855 SemaRef.Context.VoidPtrTy, 8856 diag::err_operator_delete_dependent_param_type, 8857 diag::err_operator_delete_param_type)) 8858 return true; 8859 8860 return false; 8861} 8862 8863/// CheckOverloadedOperatorDeclaration - Check whether the declaration 8864/// of this overloaded operator is well-formed. If so, returns false; 8865/// otherwise, emits appropriate diagnostics and returns true. 8866bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 8867 assert(FnDecl && FnDecl->isOverloadedOperator() && 8868 "Expected an overloaded operator declaration"); 8869 8870 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 8871 8872 // C++ [over.oper]p5: 8873 // The allocation and deallocation functions, operator new, 8874 // operator new[], operator delete and operator delete[], are 8875 // described completely in 3.7.3. The attributes and restrictions 8876 // found in the rest of this subclause do not apply to them unless 8877 // explicitly stated in 3.7.3. 8878 if (Op == OO_Delete || Op == OO_Array_Delete) 8879 return CheckOperatorDeleteDeclaration(*this, FnDecl); 8880 8881 if (Op == OO_New || Op == OO_Array_New) 8882 return CheckOperatorNewDeclaration(*this, FnDecl); 8883 8884 // C++ [over.oper]p6: 8885 // An operator function shall either be a non-static member 8886 // function or be a non-member function and have at least one 8887 // parameter whose type is a class, a reference to a class, an 8888 // enumeration, or a reference to an enumeration. 8889 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 8890 if (MethodDecl->isStatic()) 8891 return Diag(FnDecl->getLocation(), 8892 diag::err_operator_overload_static) << FnDecl->getDeclName(); 8893 } else { 8894 bool ClassOrEnumParam = false; 8895 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 8896 ParamEnd = FnDecl->param_end(); 8897 Param != ParamEnd; ++Param) { 8898 QualType ParamType = (*Param)->getType().getNonReferenceType(); 8899 if (ParamType->isDependentType() || ParamType->isRecordType() || 8900 ParamType->isEnumeralType()) { 8901 ClassOrEnumParam = true; 8902 break; 8903 } 8904 } 8905 8906 if (!ClassOrEnumParam) 8907 return Diag(FnDecl->getLocation(), 8908 diag::err_operator_overload_needs_class_or_enum) 8909 << FnDecl->getDeclName(); 8910 } 8911 8912 // C++ [over.oper]p8: 8913 // An operator function cannot have default arguments (8.3.6), 8914 // except where explicitly stated below. 8915 // 8916 // Only the function-call operator allows default arguments 8917 // (C++ [over.call]p1). 8918 if (Op != OO_Call) { 8919 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8920 Param != FnDecl->param_end(); ++Param) { 8921 if ((*Param)->hasDefaultArg()) 8922 return Diag((*Param)->getLocation(), 8923 diag::err_operator_overload_default_arg) 8924 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 8925 } 8926 } 8927 8928 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 8929 { false, false, false } 8930#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 8931 , { Unary, Binary, MemberOnly } 8932#include "clang/Basic/OperatorKinds.def" 8933 }; 8934 8935 bool CanBeUnaryOperator = OperatorUses[Op][0]; 8936 bool CanBeBinaryOperator = OperatorUses[Op][1]; 8937 bool MustBeMemberOperator = OperatorUses[Op][2]; 8938 8939 // C++ [over.oper]p8: 8940 // [...] Operator functions cannot have more or fewer parameters 8941 // than the number required for the corresponding operator, as 8942 // described in the rest of this subclause. 8943 unsigned NumParams = FnDecl->getNumParams() 8944 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 8945 if (Op != OO_Call && 8946 ((NumParams == 1 && !CanBeUnaryOperator) || 8947 (NumParams == 2 && !CanBeBinaryOperator) || 8948 (NumParams < 1) || (NumParams > 2))) { 8949 // We have the wrong number of parameters. 8950 unsigned ErrorKind; 8951 if (CanBeUnaryOperator && CanBeBinaryOperator) { 8952 ErrorKind = 2; // 2 -> unary or binary. 8953 } else if (CanBeUnaryOperator) { 8954 ErrorKind = 0; // 0 -> unary 8955 } else { 8956 assert(CanBeBinaryOperator && 8957 "All non-call overloaded operators are unary or binary!"); 8958 ErrorKind = 1; // 1 -> binary 8959 } 8960 8961 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 8962 << FnDecl->getDeclName() << NumParams << ErrorKind; 8963 } 8964 8965 // Overloaded operators other than operator() cannot be variadic. 8966 if (Op != OO_Call && 8967 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 8968 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 8969 << FnDecl->getDeclName(); 8970 } 8971 8972 // Some operators must be non-static member functions. 8973 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 8974 return Diag(FnDecl->getLocation(), 8975 diag::err_operator_overload_must_be_member) 8976 << FnDecl->getDeclName(); 8977 } 8978 8979 // C++ [over.inc]p1: 8980 // The user-defined function called operator++ implements the 8981 // prefix and postfix ++ operator. If this function is a member 8982 // function with no parameters, or a non-member function with one 8983 // parameter of class or enumeration type, it defines the prefix 8984 // increment operator ++ for objects of that type. If the function 8985 // is a member function with one parameter (which shall be of type 8986 // int) or a non-member function with two parameters (the second 8987 // of which shall be of type int), it defines the postfix 8988 // increment operator ++ for objects of that type. 8989 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 8990 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 8991 bool ParamIsInt = false; 8992 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 8993 ParamIsInt = BT->getKind() == BuiltinType::Int; 8994 8995 if (!ParamIsInt) 8996 return Diag(LastParam->getLocation(), 8997 diag::err_operator_overload_post_incdec_must_be_int) 8998 << LastParam->getType() << (Op == OO_MinusMinus); 8999 } 9000 9001 return false; 9002} 9003 9004/// CheckLiteralOperatorDeclaration - Check whether the declaration 9005/// of this literal operator function is well-formed. If so, returns 9006/// false; otherwise, emits appropriate diagnostics and returns true. 9007bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9008 DeclContext *DC = FnDecl->getDeclContext(); 9009 Decl::Kind Kind = DC->getDeclKind(); 9010 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9011 Kind != Decl::LinkageSpec) { 9012 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9013 << FnDecl->getDeclName(); 9014 return true; 9015 } 9016 9017 bool Valid = false; 9018 9019 // template <char...> type operator "" name() is the only valid template 9020 // signature, and the only valid signature with no parameters. 9021 if (FnDecl->param_size() == 0) { 9022 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9023 // Must have only one template parameter 9024 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9025 if (Params->size() == 1) { 9026 NonTypeTemplateParmDecl *PmDecl = 9027 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9028 9029 // The template parameter must be a char parameter pack. 9030 if (PmDecl && PmDecl->isTemplateParameterPack() && 9031 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9032 Valid = true; 9033 } 9034 } 9035 } else { 9036 // Check the first parameter 9037 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9038 9039 QualType T = (*Param)->getType(); 9040 9041 // unsigned long long int, long double, and any character type are allowed 9042 // as the only parameters. 9043 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9044 Context.hasSameType(T, Context.LongDoubleTy) || 9045 Context.hasSameType(T, Context.CharTy) || 9046 Context.hasSameType(T, Context.WCharTy) || 9047 Context.hasSameType(T, Context.Char16Ty) || 9048 Context.hasSameType(T, Context.Char32Ty)) { 9049 if (++Param == FnDecl->param_end()) 9050 Valid = true; 9051 goto FinishedParams; 9052 } 9053 9054 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9055 const PointerType *PT = T->getAs<PointerType>(); 9056 if (!PT) 9057 goto FinishedParams; 9058 T = PT->getPointeeType(); 9059 if (!T.isConstQualified()) 9060 goto FinishedParams; 9061 T = T.getUnqualifiedType(); 9062 9063 // Move on to the second parameter; 9064 ++Param; 9065 9066 // If there is no second parameter, the first must be a const char * 9067 if (Param == FnDecl->param_end()) { 9068 if (Context.hasSameType(T, Context.CharTy)) 9069 Valid = true; 9070 goto FinishedParams; 9071 } 9072 9073 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9074 // are allowed as the first parameter to a two-parameter function 9075 if (!(Context.hasSameType(T, Context.CharTy) || 9076 Context.hasSameType(T, Context.WCharTy) || 9077 Context.hasSameType(T, Context.Char16Ty) || 9078 Context.hasSameType(T, Context.Char32Ty))) 9079 goto FinishedParams; 9080 9081 // The second and final parameter must be an std::size_t 9082 T = (*Param)->getType().getUnqualifiedType(); 9083 if (Context.hasSameType(T, Context.getSizeType()) && 9084 ++Param == FnDecl->param_end()) 9085 Valid = true; 9086 } 9087 9088 // FIXME: This diagnostic is absolutely terrible. 9089FinishedParams: 9090 if (!Valid) { 9091 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9092 << FnDecl->getDeclName(); 9093 return true; 9094 } 9095 9096 StringRef LiteralName 9097 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9098 if (LiteralName[0] != '_') { 9099 // C++0x [usrlit.suffix]p1: 9100 // Literal suffix identifiers that do not start with an underscore are 9101 // reserved for future standardization. 9102 bool IsHexFloat = true; 9103 if (LiteralName.size() > 1 && 9104 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9105 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9106 if (!isdigit(LiteralName[I])) { 9107 IsHexFloat = false; 9108 break; 9109 } 9110 } 9111 } 9112 9113 if (IsHexFloat) 9114 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9115 << LiteralName; 9116 else 9117 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9118 } 9119 9120 return false; 9121} 9122 9123/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9124/// linkage specification, including the language and (if present) 9125/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9126/// the location of the language string literal, which is provided 9127/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9128/// the '{' brace. Otherwise, this linkage specification does not 9129/// have any braces. 9130Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9131 SourceLocation LangLoc, 9132 StringRef Lang, 9133 SourceLocation LBraceLoc) { 9134 LinkageSpecDecl::LanguageIDs Language; 9135 if (Lang == "\"C\"") 9136 Language = LinkageSpecDecl::lang_c; 9137 else if (Lang == "\"C++\"") 9138 Language = LinkageSpecDecl::lang_cxx; 9139 else { 9140 Diag(LangLoc, diag::err_bad_language); 9141 return 0; 9142 } 9143 9144 // FIXME: Add all the various semantics of linkage specifications 9145 9146 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9147 ExternLoc, LangLoc, Language); 9148 CurContext->addDecl(D); 9149 PushDeclContext(S, D); 9150 return D; 9151} 9152 9153/// ActOnFinishLinkageSpecification - Complete the definition of 9154/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9155/// valid, it's the position of the closing '}' brace in a linkage 9156/// specification that uses braces. 9157Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9158 Decl *LinkageSpec, 9159 SourceLocation RBraceLoc) { 9160 if (LinkageSpec) { 9161 if (RBraceLoc.isValid()) { 9162 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9163 LSDecl->setRBraceLoc(RBraceLoc); 9164 } 9165 PopDeclContext(); 9166 } 9167 return LinkageSpec; 9168} 9169 9170/// \brief Perform semantic analysis for the variable declaration that 9171/// occurs within a C++ catch clause, returning the newly-created 9172/// variable. 9173VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9174 TypeSourceInfo *TInfo, 9175 SourceLocation StartLoc, 9176 SourceLocation Loc, 9177 IdentifierInfo *Name) { 9178 bool Invalid = false; 9179 QualType ExDeclType = TInfo->getType(); 9180 9181 // Arrays and functions decay. 9182 if (ExDeclType->isArrayType()) 9183 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9184 else if (ExDeclType->isFunctionType()) 9185 ExDeclType = Context.getPointerType(ExDeclType); 9186 9187 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9188 // The exception-declaration shall not denote a pointer or reference to an 9189 // incomplete type, other than [cv] void*. 9190 // N2844 forbids rvalue references. 9191 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9192 Diag(Loc, diag::err_catch_rvalue_ref); 9193 Invalid = true; 9194 } 9195 9196 // GCC allows catching pointers and references to incomplete types 9197 // as an extension; so do we, but we warn by default. 9198 9199 QualType BaseType = ExDeclType; 9200 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9201 unsigned DK = diag::err_catch_incomplete; 9202 bool IncompleteCatchIsInvalid = true; 9203 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9204 BaseType = Ptr->getPointeeType(); 9205 Mode = 1; 9206 DK = diag::ext_catch_incomplete_ptr; 9207 IncompleteCatchIsInvalid = false; 9208 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9209 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9210 BaseType = Ref->getPointeeType(); 9211 Mode = 2; 9212 DK = diag::ext_catch_incomplete_ref; 9213 IncompleteCatchIsInvalid = false; 9214 } 9215 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9216 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9217 IncompleteCatchIsInvalid) 9218 Invalid = true; 9219 9220 if (!Invalid && !ExDeclType->isDependentType() && 9221 RequireNonAbstractType(Loc, ExDeclType, 9222 diag::err_abstract_type_in_decl, 9223 AbstractVariableType)) 9224 Invalid = true; 9225 9226 // Only the non-fragile NeXT runtime currently supports C++ catches 9227 // of ObjC types, and no runtime supports catching ObjC types by value. 9228 if (!Invalid && getLangOptions().ObjC1) { 9229 QualType T = ExDeclType; 9230 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9231 T = RT->getPointeeType(); 9232 9233 if (T->isObjCObjectType()) { 9234 Diag(Loc, diag::err_objc_object_catch); 9235 Invalid = true; 9236 } else if (T->isObjCObjectPointerType()) { 9237 if (!getLangOptions().ObjCNonFragileABI) 9238 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9239 } 9240 } 9241 9242 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9243 ExDeclType, TInfo, SC_None, SC_None); 9244 ExDecl->setExceptionVariable(true); 9245 9246 if (!Invalid && !ExDeclType->isDependentType()) { 9247 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9248 // C++ [except.handle]p16: 9249 // The object declared in an exception-declaration or, if the 9250 // exception-declaration does not specify a name, a temporary (12.2) is 9251 // copy-initialized (8.5) from the exception object. [...] 9252 // The object is destroyed when the handler exits, after the destruction 9253 // of any automatic objects initialized within the handler. 9254 // 9255 // We just pretend to initialize the object with itself, then make sure 9256 // it can be destroyed later. 9257 QualType initType = ExDeclType; 9258 9259 InitializedEntity entity = 9260 InitializedEntity::InitializeVariable(ExDecl); 9261 InitializationKind initKind = 9262 InitializationKind::CreateCopy(Loc, SourceLocation()); 9263 9264 Expr *opaqueValue = 9265 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9266 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9267 ExprResult result = sequence.Perform(*this, entity, initKind, 9268 MultiExprArg(&opaqueValue, 1)); 9269 if (result.isInvalid()) 9270 Invalid = true; 9271 else { 9272 // If the constructor used was non-trivial, set this as the 9273 // "initializer". 9274 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9275 if (!construct->getConstructor()->isTrivial()) { 9276 Expr *init = MaybeCreateExprWithCleanups(construct); 9277 ExDecl->setInit(init); 9278 } 9279 9280 // And make sure it's destructable. 9281 FinalizeVarWithDestructor(ExDecl, recordType); 9282 } 9283 } 9284 } 9285 9286 if (Invalid) 9287 ExDecl->setInvalidDecl(); 9288 9289 return ExDecl; 9290} 9291 9292/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9293/// handler. 9294Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9295 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9296 bool Invalid = D.isInvalidType(); 9297 9298 // Check for unexpanded parameter packs. 9299 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9300 UPPC_ExceptionType)) { 9301 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9302 D.getIdentifierLoc()); 9303 Invalid = true; 9304 } 9305 9306 IdentifierInfo *II = D.getIdentifier(); 9307 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9308 LookupOrdinaryName, 9309 ForRedeclaration)) { 9310 // The scope should be freshly made just for us. There is just no way 9311 // it contains any previous declaration. 9312 assert(!S->isDeclScope(PrevDecl)); 9313 if (PrevDecl->isTemplateParameter()) { 9314 // Maybe we will complain about the shadowed template parameter. 9315 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9316 } 9317 } 9318 9319 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9320 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9321 << D.getCXXScopeSpec().getRange(); 9322 Invalid = true; 9323 } 9324 9325 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9326 D.getSourceRange().getBegin(), 9327 D.getIdentifierLoc(), 9328 D.getIdentifier()); 9329 if (Invalid) 9330 ExDecl->setInvalidDecl(); 9331 9332 // Add the exception declaration into this scope. 9333 if (II) 9334 PushOnScopeChains(ExDecl, S); 9335 else 9336 CurContext->addDecl(ExDecl); 9337 9338 ProcessDeclAttributes(S, ExDecl, D); 9339 return ExDecl; 9340} 9341 9342Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9343 Expr *AssertExpr, 9344 Expr *AssertMessageExpr_, 9345 SourceLocation RParenLoc) { 9346 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9347 9348 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9349 llvm::APSInt Value(32); 9350 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9351 Diag(StaticAssertLoc, 9352 diag::err_static_assert_expression_is_not_constant) << 9353 AssertExpr->getSourceRange(); 9354 return 0; 9355 } 9356 9357 if (Value == 0) { 9358 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9359 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9360 } 9361 } 9362 9363 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9364 return 0; 9365 9366 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9367 AssertExpr, AssertMessage, RParenLoc); 9368 9369 CurContext->addDecl(Decl); 9370 return Decl; 9371} 9372 9373/// \brief Perform semantic analysis of the given friend type declaration. 9374/// 9375/// \returns A friend declaration that. 9376FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9377 TypeSourceInfo *TSInfo) { 9378 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9379 9380 QualType T = TSInfo->getType(); 9381 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9382 9383 if (!getLangOptions().CPlusPlus0x) { 9384 // C++03 [class.friend]p2: 9385 // An elaborated-type-specifier shall be used in a friend declaration 9386 // for a class.* 9387 // 9388 // * The class-key of the elaborated-type-specifier is required. 9389 if (!ActiveTemplateInstantiations.empty()) { 9390 // Do not complain about the form of friend template types during 9391 // template instantiation; we will already have complained when the 9392 // template was declared. 9393 } else if (!T->isElaboratedTypeSpecifier()) { 9394 // If we evaluated the type to a record type, suggest putting 9395 // a tag in front. 9396 if (const RecordType *RT = T->getAs<RecordType>()) { 9397 RecordDecl *RD = RT->getDecl(); 9398 9399 std::string InsertionText = std::string(" ") + RD->getKindName(); 9400 9401 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9402 << (unsigned) RD->getTagKind() 9403 << T 9404 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9405 InsertionText); 9406 } else { 9407 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9408 << T 9409 << SourceRange(FriendLoc, TypeRange.getEnd()); 9410 } 9411 } else if (T->getAs<EnumType>()) { 9412 Diag(FriendLoc, diag::ext_enum_friend) 9413 << T 9414 << SourceRange(FriendLoc, TypeRange.getEnd()); 9415 } 9416 } 9417 9418 // C++0x [class.friend]p3: 9419 // If the type specifier in a friend declaration designates a (possibly 9420 // cv-qualified) class type, that class is declared as a friend; otherwise, 9421 // the friend declaration is ignored. 9422 9423 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9424 // in [class.friend]p3 that we do not implement. 9425 9426 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9427} 9428 9429/// Handle a friend tag declaration where the scope specifier was 9430/// templated. 9431Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9432 unsigned TagSpec, SourceLocation TagLoc, 9433 CXXScopeSpec &SS, 9434 IdentifierInfo *Name, SourceLocation NameLoc, 9435 AttributeList *Attr, 9436 MultiTemplateParamsArg TempParamLists) { 9437 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9438 9439 bool isExplicitSpecialization = false; 9440 bool Invalid = false; 9441 9442 if (TemplateParameterList *TemplateParams 9443 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9444 TempParamLists.get(), 9445 TempParamLists.size(), 9446 /*friend*/ true, 9447 isExplicitSpecialization, 9448 Invalid)) { 9449 if (TemplateParams->size() > 0) { 9450 // This is a declaration of a class template. 9451 if (Invalid) 9452 return 0; 9453 9454 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9455 SS, Name, NameLoc, Attr, 9456 TemplateParams, AS_public, 9457 /*ModulePrivateLoc=*/SourceLocation(), 9458 TempParamLists.size() - 1, 9459 (TemplateParameterList**) TempParamLists.release()).take(); 9460 } else { 9461 // The "template<>" header is extraneous. 9462 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9463 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9464 isExplicitSpecialization = true; 9465 } 9466 } 9467 9468 if (Invalid) return 0; 9469 9470 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9471 9472 bool isAllExplicitSpecializations = true; 9473 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9474 if (TempParamLists.get()[I]->size()) { 9475 isAllExplicitSpecializations = false; 9476 break; 9477 } 9478 } 9479 9480 // FIXME: don't ignore attributes. 9481 9482 // If it's explicit specializations all the way down, just forget 9483 // about the template header and build an appropriate non-templated 9484 // friend. TODO: for source fidelity, remember the headers. 9485 if (isAllExplicitSpecializations) { 9486 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9487 ElaboratedTypeKeyword Keyword 9488 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9489 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9490 *Name, NameLoc); 9491 if (T.isNull()) 9492 return 0; 9493 9494 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9495 if (isa<DependentNameType>(T)) { 9496 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9497 TL.setKeywordLoc(TagLoc); 9498 TL.setQualifierLoc(QualifierLoc); 9499 TL.setNameLoc(NameLoc); 9500 } else { 9501 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9502 TL.setKeywordLoc(TagLoc); 9503 TL.setQualifierLoc(QualifierLoc); 9504 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9505 } 9506 9507 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9508 TSI, FriendLoc); 9509 Friend->setAccess(AS_public); 9510 CurContext->addDecl(Friend); 9511 return Friend; 9512 } 9513 9514 // Handle the case of a templated-scope friend class. e.g. 9515 // template <class T> class A<T>::B; 9516 // FIXME: we don't support these right now. 9517 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9518 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9519 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9520 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9521 TL.setKeywordLoc(TagLoc); 9522 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9523 TL.setNameLoc(NameLoc); 9524 9525 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9526 TSI, FriendLoc); 9527 Friend->setAccess(AS_public); 9528 Friend->setUnsupportedFriend(true); 9529 CurContext->addDecl(Friend); 9530 return Friend; 9531} 9532 9533 9534/// Handle a friend type declaration. This works in tandem with 9535/// ActOnTag. 9536/// 9537/// Notes on friend class templates: 9538/// 9539/// We generally treat friend class declarations as if they were 9540/// declaring a class. So, for example, the elaborated type specifier 9541/// in a friend declaration is required to obey the restrictions of a 9542/// class-head (i.e. no typedefs in the scope chain), template 9543/// parameters are required to match up with simple template-ids, &c. 9544/// However, unlike when declaring a template specialization, it's 9545/// okay to refer to a template specialization without an empty 9546/// template parameter declaration, e.g. 9547/// friend class A<T>::B<unsigned>; 9548/// We permit this as a special case; if there are any template 9549/// parameters present at all, require proper matching, i.e. 9550/// template <> template <class T> friend class A<int>::B; 9551Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9552 MultiTemplateParamsArg TempParams) { 9553 SourceLocation Loc = DS.getSourceRange().getBegin(); 9554 9555 assert(DS.isFriendSpecified()); 9556 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9557 9558 // Try to convert the decl specifier to a type. This works for 9559 // friend templates because ActOnTag never produces a ClassTemplateDecl 9560 // for a TUK_Friend. 9561 Declarator TheDeclarator(DS, Declarator::MemberContext); 9562 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9563 QualType T = TSI->getType(); 9564 if (TheDeclarator.isInvalidType()) 9565 return 0; 9566 9567 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9568 return 0; 9569 9570 // This is definitely an error in C++98. It's probably meant to 9571 // be forbidden in C++0x, too, but the specification is just 9572 // poorly written. 9573 // 9574 // The problem is with declarations like the following: 9575 // template <T> friend A<T>::foo; 9576 // where deciding whether a class C is a friend or not now hinges 9577 // on whether there exists an instantiation of A that causes 9578 // 'foo' to equal C. There are restrictions on class-heads 9579 // (which we declare (by fiat) elaborated friend declarations to 9580 // be) that makes this tractable. 9581 // 9582 // FIXME: handle "template <> friend class A<T>;", which 9583 // is possibly well-formed? Who even knows? 9584 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9585 Diag(Loc, diag::err_tagless_friend_type_template) 9586 << DS.getSourceRange(); 9587 return 0; 9588 } 9589 9590 // C++98 [class.friend]p1: A friend of a class is a function 9591 // or class that is not a member of the class . . . 9592 // This is fixed in DR77, which just barely didn't make the C++03 9593 // deadline. It's also a very silly restriction that seriously 9594 // affects inner classes and which nobody else seems to implement; 9595 // thus we never diagnose it, not even in -pedantic. 9596 // 9597 // But note that we could warn about it: it's always useless to 9598 // friend one of your own members (it's not, however, worthless to 9599 // friend a member of an arbitrary specialization of your template). 9600 9601 Decl *D; 9602 if (unsigned NumTempParamLists = TempParams.size()) 9603 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9604 NumTempParamLists, 9605 TempParams.release(), 9606 TSI, 9607 DS.getFriendSpecLoc()); 9608 else 9609 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9610 9611 if (!D) 9612 return 0; 9613 9614 D->setAccess(AS_public); 9615 CurContext->addDecl(D); 9616 9617 return D; 9618} 9619 9620Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 9621 MultiTemplateParamsArg TemplateParams) { 9622 const DeclSpec &DS = D.getDeclSpec(); 9623 9624 assert(DS.isFriendSpecified()); 9625 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9626 9627 SourceLocation Loc = D.getIdentifierLoc(); 9628 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9629 QualType T = TInfo->getType(); 9630 9631 // C++ [class.friend]p1 9632 // A friend of a class is a function or class.... 9633 // Note that this sees through typedefs, which is intended. 9634 // It *doesn't* see through dependent types, which is correct 9635 // according to [temp.arg.type]p3: 9636 // If a declaration acquires a function type through a 9637 // type dependent on a template-parameter and this causes 9638 // a declaration that does not use the syntactic form of a 9639 // function declarator to have a function type, the program 9640 // is ill-formed. 9641 if (!T->isFunctionType()) { 9642 Diag(Loc, diag::err_unexpected_friend); 9643 9644 // It might be worthwhile to try to recover by creating an 9645 // appropriate declaration. 9646 return 0; 9647 } 9648 9649 // C++ [namespace.memdef]p3 9650 // - If a friend declaration in a non-local class first declares a 9651 // class or function, the friend class or function is a member 9652 // of the innermost enclosing namespace. 9653 // - The name of the friend is not found by simple name lookup 9654 // until a matching declaration is provided in that namespace 9655 // scope (either before or after the class declaration granting 9656 // friendship). 9657 // - If a friend function is called, its name may be found by the 9658 // name lookup that considers functions from namespaces and 9659 // classes associated with the types of the function arguments. 9660 // - When looking for a prior declaration of a class or a function 9661 // declared as a friend, scopes outside the innermost enclosing 9662 // namespace scope are not considered. 9663 9664 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9665 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9666 DeclarationName Name = NameInfo.getName(); 9667 assert(Name); 9668 9669 // Check for unexpanded parameter packs. 9670 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9671 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9672 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9673 return 0; 9674 9675 // The context we found the declaration in, or in which we should 9676 // create the declaration. 9677 DeclContext *DC; 9678 Scope *DCScope = S; 9679 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9680 ForRedeclaration); 9681 9682 // FIXME: there are different rules in local classes 9683 9684 // There are four cases here. 9685 // - There's no scope specifier, in which case we just go to the 9686 // appropriate scope and look for a function or function template 9687 // there as appropriate. 9688 // Recover from invalid scope qualifiers as if they just weren't there. 9689 if (SS.isInvalid() || !SS.isSet()) { 9690 // C++0x [namespace.memdef]p3: 9691 // If the name in a friend declaration is neither qualified nor 9692 // a template-id and the declaration is a function or an 9693 // elaborated-type-specifier, the lookup to determine whether 9694 // the entity has been previously declared shall not consider 9695 // any scopes outside the innermost enclosing namespace. 9696 // C++0x [class.friend]p11: 9697 // If a friend declaration appears in a local class and the name 9698 // specified is an unqualified name, a prior declaration is 9699 // looked up without considering scopes that are outside the 9700 // innermost enclosing non-class scope. For a friend function 9701 // declaration, if there is no prior declaration, the program is 9702 // ill-formed. 9703 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9704 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9705 9706 // Find the appropriate context according to the above. 9707 DC = CurContext; 9708 while (true) { 9709 // Skip class contexts. If someone can cite chapter and verse 9710 // for this behavior, that would be nice --- it's what GCC and 9711 // EDG do, and it seems like a reasonable intent, but the spec 9712 // really only says that checks for unqualified existing 9713 // declarations should stop at the nearest enclosing namespace, 9714 // not that they should only consider the nearest enclosing 9715 // namespace. 9716 while (DC->isRecord()) 9717 DC = DC->getParent(); 9718 9719 LookupQualifiedName(Previous, DC); 9720 9721 // TODO: decide what we think about using declarations. 9722 if (isLocal || !Previous.empty()) 9723 break; 9724 9725 if (isTemplateId) { 9726 if (isa<TranslationUnitDecl>(DC)) break; 9727 } else { 9728 if (DC->isFileContext()) break; 9729 } 9730 DC = DC->getParent(); 9731 } 9732 9733 // C++ [class.friend]p1: A friend of a class is a function or 9734 // class that is not a member of the class . . . 9735 // C++0x changes this for both friend types and functions. 9736 // Most C++ 98 compilers do seem to give an error here, so 9737 // we do, too. 9738 if (!Previous.empty() && DC->Equals(CurContext) 9739 && !getLangOptions().CPlusPlus0x) 9740 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9741 9742 DCScope = getScopeForDeclContext(S, DC); 9743 9744 // - There's a non-dependent scope specifier, in which case we 9745 // compute it and do a previous lookup there for a function 9746 // or function template. 9747 } else if (!SS.getScopeRep()->isDependent()) { 9748 DC = computeDeclContext(SS); 9749 if (!DC) return 0; 9750 9751 if (RequireCompleteDeclContext(SS, DC)) return 0; 9752 9753 LookupQualifiedName(Previous, DC); 9754 9755 // Ignore things found implicitly in the wrong scope. 9756 // TODO: better diagnostics for this case. Suggesting the right 9757 // qualified scope would be nice... 9758 LookupResult::Filter F = Previous.makeFilter(); 9759 while (F.hasNext()) { 9760 NamedDecl *D = F.next(); 9761 if (!DC->InEnclosingNamespaceSetOf( 9762 D->getDeclContext()->getRedeclContext())) 9763 F.erase(); 9764 } 9765 F.done(); 9766 9767 if (Previous.empty()) { 9768 D.setInvalidType(); 9769 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 9770 return 0; 9771 } 9772 9773 // C++ [class.friend]p1: A friend of a class is a function or 9774 // class that is not a member of the class . . . 9775 if (DC->Equals(CurContext)) 9776 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9777 9778 // - There's a scope specifier that does not match any template 9779 // parameter lists, in which case we use some arbitrary context, 9780 // create a method or method template, and wait for instantiation. 9781 // - There's a scope specifier that does match some template 9782 // parameter lists, which we don't handle right now. 9783 } else { 9784 DC = CurContext; 9785 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 9786 } 9787 9788 if (!DC->isRecord()) { 9789 // This implies that it has to be an operator or function. 9790 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 9791 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 9792 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 9793 Diag(Loc, diag::err_introducing_special_friend) << 9794 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 9795 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 9796 return 0; 9797 } 9798 } 9799 9800 bool Redeclaration = false; 9801 bool AddToScope = true; 9802 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 9803 move(TemplateParams), 9804 IsDefinition, 9805 Redeclaration, AddToScope); 9806 if (!ND) return 0; 9807 9808 assert(ND->getDeclContext() == DC); 9809 assert(ND->getLexicalDeclContext() == CurContext); 9810 9811 // Add the function declaration to the appropriate lookup tables, 9812 // adjusting the redeclarations list as necessary. We don't 9813 // want to do this yet if the friending class is dependent. 9814 // 9815 // Also update the scope-based lookup if the target context's 9816 // lookup context is in lexical scope. 9817 if (!CurContext->isDependentContext()) { 9818 DC = DC->getRedeclContext(); 9819 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 9820 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9821 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 9822 } 9823 9824 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 9825 D.getIdentifierLoc(), ND, 9826 DS.getFriendSpecLoc()); 9827 FrD->setAccess(AS_public); 9828 CurContext->addDecl(FrD); 9829 9830 if (ND->isInvalidDecl()) 9831 FrD->setInvalidDecl(); 9832 else { 9833 FunctionDecl *FD; 9834 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 9835 FD = FTD->getTemplatedDecl(); 9836 else 9837 FD = cast<FunctionDecl>(ND); 9838 9839 // Mark templated-scope function declarations as unsupported. 9840 if (FD->getNumTemplateParameterLists()) 9841 FrD->setUnsupportedFriend(true); 9842 } 9843 9844 return ND; 9845} 9846 9847void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 9848 AdjustDeclIfTemplate(Dcl); 9849 9850 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 9851 if (!Fn) { 9852 Diag(DelLoc, diag::err_deleted_non_function); 9853 return; 9854 } 9855 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 9856 Diag(DelLoc, diag::err_deleted_decl_not_first); 9857 Diag(Prev->getLocation(), diag::note_previous_declaration); 9858 // If the declaration wasn't the first, we delete the function anyway for 9859 // recovery. 9860 } 9861 Fn->setDeletedAsWritten(); 9862} 9863 9864void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 9865 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 9866 9867 if (MD) { 9868 if (MD->getParent()->isDependentType()) { 9869 MD->setDefaulted(); 9870 MD->setExplicitlyDefaulted(); 9871 return; 9872 } 9873 9874 CXXSpecialMember Member = getSpecialMember(MD); 9875 if (Member == CXXInvalid) { 9876 Diag(DefaultLoc, diag::err_default_special_members); 9877 return; 9878 } 9879 9880 MD->setDefaulted(); 9881 MD->setExplicitlyDefaulted(); 9882 9883 // If this definition appears within the record, do the checking when 9884 // the record is complete. 9885 const FunctionDecl *Primary = MD; 9886 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 9887 // Find the uninstantiated declaration that actually had the '= default' 9888 // on it. 9889 MD->getTemplateInstantiationPattern()->isDefined(Primary); 9890 9891 if (Primary == Primary->getCanonicalDecl()) 9892 return; 9893 9894 switch (Member) { 9895 case CXXDefaultConstructor: { 9896 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9897 CheckExplicitlyDefaultedDefaultConstructor(CD); 9898 if (!CD->isInvalidDecl()) 9899 DefineImplicitDefaultConstructor(DefaultLoc, CD); 9900 break; 9901 } 9902 9903 case CXXCopyConstructor: { 9904 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9905 CheckExplicitlyDefaultedCopyConstructor(CD); 9906 if (!CD->isInvalidDecl()) 9907 DefineImplicitCopyConstructor(DefaultLoc, CD); 9908 break; 9909 } 9910 9911 case CXXCopyAssignment: { 9912 CheckExplicitlyDefaultedCopyAssignment(MD); 9913 if (!MD->isInvalidDecl()) 9914 DefineImplicitCopyAssignment(DefaultLoc, MD); 9915 break; 9916 } 9917 9918 case CXXDestructor: { 9919 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 9920 CheckExplicitlyDefaultedDestructor(DD); 9921 if (!DD->isInvalidDecl()) 9922 DefineImplicitDestructor(DefaultLoc, DD); 9923 break; 9924 } 9925 9926 case CXXMoveConstructor: { 9927 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9928 CheckExplicitlyDefaultedMoveConstructor(CD); 9929 if (!CD->isInvalidDecl()) 9930 DefineImplicitMoveConstructor(DefaultLoc, CD); 9931 break; 9932 } 9933 9934 case CXXMoveAssignment: { 9935 CheckExplicitlyDefaultedMoveAssignment(MD); 9936 if (!MD->isInvalidDecl()) 9937 DefineImplicitMoveAssignment(DefaultLoc, MD); 9938 break; 9939 } 9940 9941 case CXXInvalid: 9942 assert(false && "Invalid special member."); 9943 break; 9944 } 9945 } else { 9946 Diag(DefaultLoc, diag::err_default_special_members); 9947 } 9948} 9949 9950static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 9951 for (Stmt::child_range CI = S->children(); CI; ++CI) { 9952 Stmt *SubStmt = *CI; 9953 if (!SubStmt) 9954 continue; 9955 if (isa<ReturnStmt>(SubStmt)) 9956 Self.Diag(SubStmt->getSourceRange().getBegin(), 9957 diag::err_return_in_constructor_handler); 9958 if (!isa<Expr>(SubStmt)) 9959 SearchForReturnInStmt(Self, SubStmt); 9960 } 9961} 9962 9963void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 9964 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 9965 CXXCatchStmt *Handler = TryBlock->getHandler(I); 9966 SearchForReturnInStmt(*this, Handler); 9967 } 9968} 9969 9970bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 9971 const CXXMethodDecl *Old) { 9972 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 9973 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 9974 9975 if (Context.hasSameType(NewTy, OldTy) || 9976 NewTy->isDependentType() || OldTy->isDependentType()) 9977 return false; 9978 9979 // Check if the return types are covariant 9980 QualType NewClassTy, OldClassTy; 9981 9982 /// Both types must be pointers or references to classes. 9983 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 9984 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 9985 NewClassTy = NewPT->getPointeeType(); 9986 OldClassTy = OldPT->getPointeeType(); 9987 } 9988 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 9989 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 9990 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 9991 NewClassTy = NewRT->getPointeeType(); 9992 OldClassTy = OldRT->getPointeeType(); 9993 } 9994 } 9995 } 9996 9997 // The return types aren't either both pointers or references to a class type. 9998 if (NewClassTy.isNull()) { 9999 Diag(New->getLocation(), 10000 diag::err_different_return_type_for_overriding_virtual_function) 10001 << New->getDeclName() << NewTy << OldTy; 10002 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10003 10004 return true; 10005 } 10006 10007 // C++ [class.virtual]p6: 10008 // If the return type of D::f differs from the return type of B::f, the 10009 // class type in the return type of D::f shall be complete at the point of 10010 // declaration of D::f or shall be the class type D. 10011 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10012 if (!RT->isBeingDefined() && 10013 RequireCompleteType(New->getLocation(), NewClassTy, 10014 PDiag(diag::err_covariant_return_incomplete) 10015 << New->getDeclName())) 10016 return true; 10017 } 10018 10019 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10020 // Check if the new class derives from the old class. 10021 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10022 Diag(New->getLocation(), 10023 diag::err_covariant_return_not_derived) 10024 << New->getDeclName() << NewTy << OldTy; 10025 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10026 return true; 10027 } 10028 10029 // Check if we the conversion from derived to base is valid. 10030 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10031 diag::err_covariant_return_inaccessible_base, 10032 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10033 // FIXME: Should this point to the return type? 10034 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10035 // FIXME: this note won't trigger for delayed access control 10036 // diagnostics, and it's impossible to get an undelayed error 10037 // here from access control during the original parse because 10038 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10039 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10040 return true; 10041 } 10042 } 10043 10044 // The qualifiers of the return types must be the same. 10045 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10046 Diag(New->getLocation(), 10047 diag::err_covariant_return_type_different_qualifications) 10048 << New->getDeclName() << NewTy << OldTy; 10049 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10050 return true; 10051 }; 10052 10053 10054 // The new class type must have the same or less qualifiers as the old type. 10055 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10056 Diag(New->getLocation(), 10057 diag::err_covariant_return_type_class_type_more_qualified) 10058 << New->getDeclName() << NewTy << OldTy; 10059 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10060 return true; 10061 }; 10062 10063 return false; 10064} 10065 10066/// \brief Mark the given method pure. 10067/// 10068/// \param Method the method to be marked pure. 10069/// 10070/// \param InitRange the source range that covers the "0" initializer. 10071bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10072 SourceLocation EndLoc = InitRange.getEnd(); 10073 if (EndLoc.isValid()) 10074 Method->setRangeEnd(EndLoc); 10075 10076 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10077 Method->setPure(); 10078 return false; 10079 } 10080 10081 if (!Method->isInvalidDecl()) 10082 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10083 << Method->getDeclName() << InitRange; 10084 return true; 10085} 10086 10087/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10088/// an initializer for the out-of-line declaration 'Dcl'. The scope 10089/// is a fresh scope pushed for just this purpose. 10090/// 10091/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10092/// static data member of class X, names should be looked up in the scope of 10093/// class X. 10094void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10095 // If there is no declaration, there was an error parsing it. 10096 if (D == 0 || D->isInvalidDecl()) return; 10097 10098 // We should only get called for declarations with scope specifiers, like: 10099 // int foo::bar; 10100 assert(D->isOutOfLine()); 10101 EnterDeclaratorContext(S, D->getDeclContext()); 10102} 10103 10104/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10105/// initializer for the out-of-line declaration 'D'. 10106void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10107 // If there is no declaration, there was an error parsing it. 10108 if (D == 0 || D->isInvalidDecl()) return; 10109 10110 assert(D->isOutOfLine()); 10111 ExitDeclaratorContext(S); 10112} 10113 10114/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10115/// C++ if/switch/while/for statement. 10116/// e.g: "if (int x = f()) {...}" 10117DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10118 // C++ 6.4p2: 10119 // The declarator shall not specify a function or an array. 10120 // The type-specifier-seq shall not contain typedef and shall not declare a 10121 // new class or enumeration. 10122 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10123 "Parser allowed 'typedef' as storage class of condition decl."); 10124 10125 Decl *Dcl = ActOnDeclarator(S, D); 10126 if (!Dcl) 10127 return true; 10128 10129 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10130 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10131 << D.getSourceRange(); 10132 return true; 10133 } 10134 10135 return Dcl; 10136} 10137 10138void Sema::LoadExternalVTableUses() { 10139 if (!ExternalSource) 10140 return; 10141 10142 SmallVector<ExternalVTableUse, 4> VTables; 10143 ExternalSource->ReadUsedVTables(VTables); 10144 SmallVector<VTableUse, 4> NewUses; 10145 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10146 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10147 = VTablesUsed.find(VTables[I].Record); 10148 // Even if a definition wasn't required before, it may be required now. 10149 if (Pos != VTablesUsed.end()) { 10150 if (!Pos->second && VTables[I].DefinitionRequired) 10151 Pos->second = true; 10152 continue; 10153 } 10154 10155 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10156 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10157 } 10158 10159 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10160} 10161 10162void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10163 bool DefinitionRequired) { 10164 // Ignore any vtable uses in unevaluated operands or for classes that do 10165 // not have a vtable. 10166 if (!Class->isDynamicClass() || Class->isDependentContext() || 10167 CurContext->isDependentContext() || 10168 ExprEvalContexts.back().Context == Unevaluated) 10169 return; 10170 10171 // Try to insert this class into the map. 10172 LoadExternalVTableUses(); 10173 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10174 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10175 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10176 if (!Pos.second) { 10177 // If we already had an entry, check to see if we are promoting this vtable 10178 // to required a definition. If so, we need to reappend to the VTableUses 10179 // list, since we may have already processed the first entry. 10180 if (DefinitionRequired && !Pos.first->second) { 10181 Pos.first->second = true; 10182 } else { 10183 // Otherwise, we can early exit. 10184 return; 10185 } 10186 } 10187 10188 // Local classes need to have their virtual members marked 10189 // immediately. For all other classes, we mark their virtual members 10190 // at the end of the translation unit. 10191 if (Class->isLocalClass()) 10192 MarkVirtualMembersReferenced(Loc, Class); 10193 else 10194 VTableUses.push_back(std::make_pair(Class, Loc)); 10195} 10196 10197bool Sema::DefineUsedVTables() { 10198 LoadExternalVTableUses(); 10199 if (VTableUses.empty()) 10200 return false; 10201 10202 // Note: The VTableUses vector could grow as a result of marking 10203 // the members of a class as "used", so we check the size each 10204 // time through the loop and prefer indices (with are stable) to 10205 // iterators (which are not). 10206 bool DefinedAnything = false; 10207 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10208 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10209 if (!Class) 10210 continue; 10211 10212 SourceLocation Loc = VTableUses[I].second; 10213 10214 // If this class has a key function, but that key function is 10215 // defined in another translation unit, we don't need to emit the 10216 // vtable even though we're using it. 10217 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10218 if (KeyFunction && !KeyFunction->hasBody()) { 10219 switch (KeyFunction->getTemplateSpecializationKind()) { 10220 case TSK_Undeclared: 10221 case TSK_ExplicitSpecialization: 10222 case TSK_ExplicitInstantiationDeclaration: 10223 // The key function is in another translation unit. 10224 continue; 10225 10226 case TSK_ExplicitInstantiationDefinition: 10227 case TSK_ImplicitInstantiation: 10228 // We will be instantiating the key function. 10229 break; 10230 } 10231 } else if (!KeyFunction) { 10232 // If we have a class with no key function that is the subject 10233 // of an explicit instantiation declaration, suppress the 10234 // vtable; it will live with the explicit instantiation 10235 // definition. 10236 bool IsExplicitInstantiationDeclaration 10237 = Class->getTemplateSpecializationKind() 10238 == TSK_ExplicitInstantiationDeclaration; 10239 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10240 REnd = Class->redecls_end(); 10241 R != REnd; ++R) { 10242 TemplateSpecializationKind TSK 10243 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10244 if (TSK == TSK_ExplicitInstantiationDeclaration) 10245 IsExplicitInstantiationDeclaration = true; 10246 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10247 IsExplicitInstantiationDeclaration = false; 10248 break; 10249 } 10250 } 10251 10252 if (IsExplicitInstantiationDeclaration) 10253 continue; 10254 } 10255 10256 // Mark all of the virtual members of this class as referenced, so 10257 // that we can build a vtable. Then, tell the AST consumer that a 10258 // vtable for this class is required. 10259 DefinedAnything = true; 10260 MarkVirtualMembersReferenced(Loc, Class); 10261 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10262 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10263 10264 // Optionally warn if we're emitting a weak vtable. 10265 if (Class->getLinkage() == ExternalLinkage && 10266 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10267 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 10268 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10269 } 10270 } 10271 VTableUses.clear(); 10272 10273 return DefinedAnything; 10274} 10275 10276void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10277 const CXXRecordDecl *RD) { 10278 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10279 e = RD->method_end(); i != e; ++i) { 10280 CXXMethodDecl *MD = *i; 10281 10282 // C++ [basic.def.odr]p2: 10283 // [...] A virtual member function is used if it is not pure. [...] 10284 if (MD->isVirtual() && !MD->isPure()) 10285 MarkDeclarationReferenced(Loc, MD); 10286 } 10287 10288 // Only classes that have virtual bases need a VTT. 10289 if (RD->getNumVBases() == 0) 10290 return; 10291 10292 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10293 e = RD->bases_end(); i != e; ++i) { 10294 const CXXRecordDecl *Base = 10295 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10296 if (Base->getNumVBases() == 0) 10297 continue; 10298 MarkVirtualMembersReferenced(Loc, Base); 10299 } 10300} 10301 10302/// SetIvarInitializers - This routine builds initialization ASTs for the 10303/// Objective-C implementation whose ivars need be initialized. 10304void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10305 if (!getLangOptions().CPlusPlus) 10306 return; 10307 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10308 SmallVector<ObjCIvarDecl*, 8> ivars; 10309 CollectIvarsToConstructOrDestruct(OID, ivars); 10310 if (ivars.empty()) 10311 return; 10312 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10313 for (unsigned i = 0; i < ivars.size(); i++) { 10314 FieldDecl *Field = ivars[i]; 10315 if (Field->isInvalidDecl()) 10316 continue; 10317 10318 CXXCtorInitializer *Member; 10319 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10320 InitializationKind InitKind = 10321 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10322 10323 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10324 ExprResult MemberInit = 10325 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10326 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10327 // Note, MemberInit could actually come back empty if no initialization 10328 // is required (e.g., because it would call a trivial default constructor) 10329 if (!MemberInit.get() || MemberInit.isInvalid()) 10330 continue; 10331 10332 Member = 10333 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10334 SourceLocation(), 10335 MemberInit.takeAs<Expr>(), 10336 SourceLocation()); 10337 AllToInit.push_back(Member); 10338 10339 // Be sure that the destructor is accessible and is marked as referenced. 10340 if (const RecordType *RecordTy 10341 = Context.getBaseElementType(Field->getType()) 10342 ->getAs<RecordType>()) { 10343 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10344 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10345 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10346 CheckDestructorAccess(Field->getLocation(), Destructor, 10347 PDiag(diag::err_access_dtor_ivar) 10348 << Context.getBaseElementType(Field->getType())); 10349 } 10350 } 10351 } 10352 ObjCImplementation->setIvarInitializers(Context, 10353 AllToInit.data(), AllToInit.size()); 10354 } 10355} 10356 10357static 10358void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10359 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10360 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10361 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10362 Sema &S) { 10363 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10364 CE = Current.end(); 10365 if (Ctor->isInvalidDecl()) 10366 return; 10367 10368 const FunctionDecl *FNTarget = 0; 10369 CXXConstructorDecl *Target; 10370 10371 // We ignore the result here since if we don't have a body, Target will be 10372 // null below. 10373 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10374 Target 10375= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10376 10377 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10378 // Avoid dereferencing a null pointer here. 10379 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10380 10381 if (!Current.insert(Canonical)) 10382 return; 10383 10384 // We know that beyond here, we aren't chaining into a cycle. 10385 if (!Target || !Target->isDelegatingConstructor() || 10386 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10387 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10388 Valid.insert(*CI); 10389 Current.clear(); 10390 // We've hit a cycle. 10391 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10392 Current.count(TCanonical)) { 10393 // If we haven't diagnosed this cycle yet, do so now. 10394 if (!Invalid.count(TCanonical)) { 10395 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10396 diag::warn_delegating_ctor_cycle) 10397 << Ctor; 10398 10399 // Don't add a note for a function delegating directo to itself. 10400 if (TCanonical != Canonical) 10401 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10402 10403 CXXConstructorDecl *C = Target; 10404 while (C->getCanonicalDecl() != Canonical) { 10405 (void)C->getTargetConstructor()->hasBody(FNTarget); 10406 assert(FNTarget && "Ctor cycle through bodiless function"); 10407 10408 C 10409 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10410 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10411 } 10412 } 10413 10414 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10415 Invalid.insert(*CI); 10416 Current.clear(); 10417 } else { 10418 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10419 } 10420} 10421 10422 10423void Sema::CheckDelegatingCtorCycles() { 10424 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10425 10426 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10427 CE = Current.end(); 10428 10429 for (DelegatingCtorDeclsType::iterator 10430 I = DelegatingCtorDecls.begin(ExternalSource), 10431 E = DelegatingCtorDecls.end(); 10432 I != E; ++I) { 10433 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10434 } 10435 10436 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10437 (*CI)->setInvalidDecl(); 10438} 10439