SemaDeclCXX.cpp revision 3f224b2efde9b02dcc78c5c85667a62dcd1f5ab3
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 2265/// \brief Determine whether the given indirect field declaration is somewhere 2266/// within an anonymous union. 2267static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2268 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2269 CEnd = F->chain_end(); 2270 C != CEnd; ++C) 2271 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2272 if (Record->isUnion()) 2273 return true; 2274 2275 return false; 2276} 2277 2278static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2279 FieldDecl *Field, 2280 IndirectFieldDecl *Indirect = 0) { 2281 2282 // Overwhelmingly common case: we have a direct initializer for this field. 2283 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2284 Info.AllToInit.push_back(Init); 2285 return false; 2286 } 2287 2288 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2289 // has a brace-or-equal-initializer, the entity is initialized as specified 2290 // in [dcl.init]. 2291 if (Field->hasInClassInitializer()) { 2292 CXXCtorInitializer *Init; 2293 if (Indirect) 2294 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2295 SourceLocation(), 2296 SourceLocation(), 0, 2297 SourceLocation()); 2298 else 2299 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2300 SourceLocation(), 2301 SourceLocation(), 0, 2302 SourceLocation()); 2303 Info.AllToInit.push_back(Init); 2304 return false; 2305 } 2306 2307 // Don't build an implicit initializer for union members if none was 2308 // explicitly specified. 2309 if (Field->getParent()->isUnion() || 2310 (Indirect && isWithinAnonymousUnion(Indirect))) 2311 return false; 2312 2313 // Don't try to build an implicit initializer if there were semantic 2314 // errors in any of the initializers (and therefore we might be 2315 // missing some that the user actually wrote). 2316 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2317 return false; 2318 2319 CXXCtorInitializer *Init = 0; 2320 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2321 Indirect, Init)) 2322 return true; 2323 2324 if (Init) 2325 Info.AllToInit.push_back(Init); 2326 2327 return false; 2328} 2329 2330bool 2331Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2332 CXXCtorInitializer *Initializer) { 2333 assert(Initializer->isDelegatingInitializer()); 2334 Constructor->setNumCtorInitializers(1); 2335 CXXCtorInitializer **initializer = 2336 new (Context) CXXCtorInitializer*[1]; 2337 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2338 Constructor->setCtorInitializers(initializer); 2339 2340 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2341 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2342 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2343 } 2344 2345 DelegatingCtorDecls.push_back(Constructor); 2346 2347 return false; 2348} 2349 2350bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2351 CXXCtorInitializer **Initializers, 2352 unsigned NumInitializers, 2353 bool AnyErrors) { 2354 if (Constructor->getDeclContext()->isDependentContext()) { 2355 // Just store the initializers as written, they will be checked during 2356 // instantiation. 2357 if (NumInitializers > 0) { 2358 Constructor->setNumCtorInitializers(NumInitializers); 2359 CXXCtorInitializer **baseOrMemberInitializers = 2360 new (Context) CXXCtorInitializer*[NumInitializers]; 2361 memcpy(baseOrMemberInitializers, Initializers, 2362 NumInitializers * sizeof(CXXCtorInitializer*)); 2363 Constructor->setCtorInitializers(baseOrMemberInitializers); 2364 } 2365 2366 return false; 2367 } 2368 2369 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2370 2371 // We need to build the initializer AST according to order of construction 2372 // and not what user specified in the Initializers list. 2373 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2374 if (!ClassDecl) 2375 return true; 2376 2377 bool HadError = false; 2378 2379 for (unsigned i = 0; i < NumInitializers; i++) { 2380 CXXCtorInitializer *Member = Initializers[i]; 2381 2382 if (Member->isBaseInitializer()) 2383 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2384 else 2385 Info.AllBaseFields[Member->getAnyMember()] = Member; 2386 } 2387 2388 // Keep track of the direct virtual bases. 2389 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2390 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2391 E = ClassDecl->bases_end(); I != E; ++I) { 2392 if (I->isVirtual()) 2393 DirectVBases.insert(I); 2394 } 2395 2396 // Push virtual bases before others. 2397 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2398 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2399 2400 if (CXXCtorInitializer *Value 2401 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2402 Info.AllToInit.push_back(Value); 2403 } else if (!AnyErrors) { 2404 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2405 CXXCtorInitializer *CXXBaseInit; 2406 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2407 VBase, IsInheritedVirtualBase, 2408 CXXBaseInit)) { 2409 HadError = true; 2410 continue; 2411 } 2412 2413 Info.AllToInit.push_back(CXXBaseInit); 2414 } 2415 } 2416 2417 // Non-virtual bases. 2418 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2419 E = ClassDecl->bases_end(); Base != E; ++Base) { 2420 // Virtuals are in the virtual base list and already constructed. 2421 if (Base->isVirtual()) 2422 continue; 2423 2424 if (CXXCtorInitializer *Value 2425 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2426 Info.AllToInit.push_back(Value); 2427 } else if (!AnyErrors) { 2428 CXXCtorInitializer *CXXBaseInit; 2429 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2430 Base, /*IsInheritedVirtualBase=*/false, 2431 CXXBaseInit)) { 2432 HadError = true; 2433 continue; 2434 } 2435 2436 Info.AllToInit.push_back(CXXBaseInit); 2437 } 2438 } 2439 2440 // Fields. 2441 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2442 MemEnd = ClassDecl->decls_end(); 2443 Mem != MemEnd; ++Mem) { 2444 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2445 if (F->getType()->isIncompleteArrayType()) { 2446 assert(ClassDecl->hasFlexibleArrayMember() && 2447 "Incomplete array type is not valid"); 2448 continue; 2449 } 2450 2451 // If we're not generating the implicit copy/move constructor, then we'll 2452 // handle anonymous struct/union fields based on their individual 2453 // indirect fields. 2454 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2455 continue; 2456 2457 if (CollectFieldInitializer(*this, Info, F)) 2458 HadError = true; 2459 continue; 2460 } 2461 2462 // Beyond this point, we only consider default initialization. 2463 if (Info.IIK != IIK_Default) 2464 continue; 2465 2466 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2467 if (F->getType()->isIncompleteArrayType()) { 2468 assert(ClassDecl->hasFlexibleArrayMember() && 2469 "Incomplete array type is not valid"); 2470 continue; 2471 } 2472 2473 // Initialize each field of an anonymous struct individually. 2474 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2475 HadError = true; 2476 2477 continue; 2478 } 2479 } 2480 2481 NumInitializers = Info.AllToInit.size(); 2482 if (NumInitializers > 0) { 2483 Constructor->setNumCtorInitializers(NumInitializers); 2484 CXXCtorInitializer **baseOrMemberInitializers = 2485 new (Context) CXXCtorInitializer*[NumInitializers]; 2486 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2487 NumInitializers * sizeof(CXXCtorInitializer*)); 2488 Constructor->setCtorInitializers(baseOrMemberInitializers); 2489 2490 // Constructors implicitly reference the base and member 2491 // destructors. 2492 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2493 Constructor->getParent()); 2494 } 2495 2496 return HadError; 2497} 2498 2499static void *GetKeyForTopLevelField(FieldDecl *Field) { 2500 // For anonymous unions, use the class declaration as the key. 2501 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2502 if (RT->getDecl()->isAnonymousStructOrUnion()) 2503 return static_cast<void *>(RT->getDecl()); 2504 } 2505 return static_cast<void *>(Field); 2506} 2507 2508static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2509 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2510} 2511 2512static void *GetKeyForMember(ASTContext &Context, 2513 CXXCtorInitializer *Member) { 2514 if (!Member->isAnyMemberInitializer()) 2515 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2516 2517 // For fields injected into the class via declaration of an anonymous union, 2518 // use its anonymous union class declaration as the unique key. 2519 FieldDecl *Field = Member->getAnyMember(); 2520 2521 // If the field is a member of an anonymous struct or union, our key 2522 // is the anonymous record decl that's a direct child of the class. 2523 RecordDecl *RD = Field->getParent(); 2524 if (RD->isAnonymousStructOrUnion()) { 2525 while (true) { 2526 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2527 if (Parent->isAnonymousStructOrUnion()) 2528 RD = Parent; 2529 else 2530 break; 2531 } 2532 2533 return static_cast<void *>(RD); 2534 } 2535 2536 return static_cast<void *>(Field); 2537} 2538 2539static void 2540DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2541 const CXXConstructorDecl *Constructor, 2542 CXXCtorInitializer **Inits, 2543 unsigned NumInits) { 2544 if (Constructor->getDeclContext()->isDependentContext()) 2545 return; 2546 2547 // Don't check initializers order unless the warning is enabled at the 2548 // location of at least one initializer. 2549 bool ShouldCheckOrder = false; 2550 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2551 CXXCtorInitializer *Init = Inits[InitIndex]; 2552 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2553 Init->getSourceLocation()) 2554 != Diagnostic::Ignored) { 2555 ShouldCheckOrder = true; 2556 break; 2557 } 2558 } 2559 if (!ShouldCheckOrder) 2560 return; 2561 2562 // Build the list of bases and members in the order that they'll 2563 // actually be initialized. The explicit initializers should be in 2564 // this same order but may be missing things. 2565 SmallVector<const void*, 32> IdealInitKeys; 2566 2567 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2568 2569 // 1. Virtual bases. 2570 for (CXXRecordDecl::base_class_const_iterator VBase = 2571 ClassDecl->vbases_begin(), 2572 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2573 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2574 2575 // 2. Non-virtual bases. 2576 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2577 E = ClassDecl->bases_end(); Base != E; ++Base) { 2578 if (Base->isVirtual()) 2579 continue; 2580 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2581 } 2582 2583 // 3. Direct fields. 2584 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2585 E = ClassDecl->field_end(); Field != E; ++Field) 2586 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2587 2588 unsigned NumIdealInits = IdealInitKeys.size(); 2589 unsigned IdealIndex = 0; 2590 2591 CXXCtorInitializer *PrevInit = 0; 2592 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2593 CXXCtorInitializer *Init = Inits[InitIndex]; 2594 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2595 2596 // Scan forward to try to find this initializer in the idealized 2597 // initializers list. 2598 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2599 if (InitKey == IdealInitKeys[IdealIndex]) 2600 break; 2601 2602 // If we didn't find this initializer, it must be because we 2603 // scanned past it on a previous iteration. That can only 2604 // happen if we're out of order; emit a warning. 2605 if (IdealIndex == NumIdealInits && PrevInit) { 2606 Sema::SemaDiagnosticBuilder D = 2607 SemaRef.Diag(PrevInit->getSourceLocation(), 2608 diag::warn_initializer_out_of_order); 2609 2610 if (PrevInit->isAnyMemberInitializer()) 2611 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2612 else 2613 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2614 2615 if (Init->isAnyMemberInitializer()) 2616 D << 0 << Init->getAnyMember()->getDeclName(); 2617 else 2618 D << 1 << Init->getBaseClassInfo()->getType(); 2619 2620 // Move back to the initializer's location in the ideal list. 2621 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2622 if (InitKey == IdealInitKeys[IdealIndex]) 2623 break; 2624 2625 assert(IdealIndex != NumIdealInits && 2626 "initializer not found in initializer list"); 2627 } 2628 2629 PrevInit = Init; 2630 } 2631} 2632 2633namespace { 2634bool CheckRedundantInit(Sema &S, 2635 CXXCtorInitializer *Init, 2636 CXXCtorInitializer *&PrevInit) { 2637 if (!PrevInit) { 2638 PrevInit = Init; 2639 return false; 2640 } 2641 2642 if (FieldDecl *Field = Init->getMember()) 2643 S.Diag(Init->getSourceLocation(), 2644 diag::err_multiple_mem_initialization) 2645 << Field->getDeclName() 2646 << Init->getSourceRange(); 2647 else { 2648 const Type *BaseClass = Init->getBaseClass(); 2649 assert(BaseClass && "neither field nor base"); 2650 S.Diag(Init->getSourceLocation(), 2651 diag::err_multiple_base_initialization) 2652 << QualType(BaseClass, 0) 2653 << Init->getSourceRange(); 2654 } 2655 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2656 << 0 << PrevInit->getSourceRange(); 2657 2658 return true; 2659} 2660 2661typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2662typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2663 2664bool CheckRedundantUnionInit(Sema &S, 2665 CXXCtorInitializer *Init, 2666 RedundantUnionMap &Unions) { 2667 FieldDecl *Field = Init->getAnyMember(); 2668 RecordDecl *Parent = Field->getParent(); 2669 if (!Parent->isAnonymousStructOrUnion()) 2670 return false; 2671 2672 NamedDecl *Child = Field; 2673 do { 2674 if (Parent->isUnion()) { 2675 UnionEntry &En = Unions[Parent]; 2676 if (En.first && En.first != Child) { 2677 S.Diag(Init->getSourceLocation(), 2678 diag::err_multiple_mem_union_initialization) 2679 << Field->getDeclName() 2680 << Init->getSourceRange(); 2681 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2682 << 0 << En.second->getSourceRange(); 2683 return true; 2684 } else if (!En.first) { 2685 En.first = Child; 2686 En.second = Init; 2687 } 2688 } 2689 2690 Child = Parent; 2691 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2692 } while (Parent->isAnonymousStructOrUnion()); 2693 2694 return false; 2695} 2696} 2697 2698/// ActOnMemInitializers - Handle the member initializers for a constructor. 2699void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2700 SourceLocation ColonLoc, 2701 CXXCtorInitializer **meminits, 2702 unsigned NumMemInits, 2703 bool AnyErrors) { 2704 if (!ConstructorDecl) 2705 return; 2706 2707 AdjustDeclIfTemplate(ConstructorDecl); 2708 2709 CXXConstructorDecl *Constructor 2710 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2711 2712 if (!Constructor) { 2713 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2714 return; 2715 } 2716 2717 CXXCtorInitializer **MemInits = 2718 reinterpret_cast<CXXCtorInitializer **>(meminits); 2719 2720 // Mapping for the duplicate initializers check. 2721 // For member initializers, this is keyed with a FieldDecl*. 2722 // For base initializers, this is keyed with a Type*. 2723 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2724 2725 // Mapping for the inconsistent anonymous-union initializers check. 2726 RedundantUnionMap MemberUnions; 2727 2728 bool HadError = false; 2729 for (unsigned i = 0; i < NumMemInits; i++) { 2730 CXXCtorInitializer *Init = MemInits[i]; 2731 2732 // Set the source order index. 2733 Init->setSourceOrder(i); 2734 2735 if (Init->isAnyMemberInitializer()) { 2736 FieldDecl *Field = Init->getAnyMember(); 2737 if (CheckRedundantInit(*this, Init, Members[Field]) || 2738 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2739 HadError = true; 2740 } else if (Init->isBaseInitializer()) { 2741 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2742 if (CheckRedundantInit(*this, Init, Members[Key])) 2743 HadError = true; 2744 } else { 2745 assert(Init->isDelegatingInitializer()); 2746 // This must be the only initializer 2747 if (i != 0 || NumMemInits > 1) { 2748 Diag(MemInits[0]->getSourceLocation(), 2749 diag::err_delegating_initializer_alone) 2750 << MemInits[0]->getSourceRange(); 2751 HadError = true; 2752 // We will treat this as being the only initializer. 2753 } 2754 SetDelegatingInitializer(Constructor, MemInits[i]); 2755 // Return immediately as the initializer is set. 2756 return; 2757 } 2758 } 2759 2760 if (HadError) 2761 return; 2762 2763 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2764 2765 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2766} 2767 2768void 2769Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2770 CXXRecordDecl *ClassDecl) { 2771 // Ignore dependent contexts. Also ignore unions, since their members never 2772 // have destructors implicitly called. 2773 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 2774 return; 2775 2776 // FIXME: all the access-control diagnostics are positioned on the 2777 // field/base declaration. That's probably good; that said, the 2778 // user might reasonably want to know why the destructor is being 2779 // emitted, and we currently don't say. 2780 2781 // Non-static data members. 2782 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2783 E = ClassDecl->field_end(); I != E; ++I) { 2784 FieldDecl *Field = *I; 2785 if (Field->isInvalidDecl()) 2786 continue; 2787 QualType FieldType = Context.getBaseElementType(Field->getType()); 2788 2789 const RecordType* RT = FieldType->getAs<RecordType>(); 2790 if (!RT) 2791 continue; 2792 2793 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2794 if (FieldClassDecl->isInvalidDecl()) 2795 continue; 2796 if (FieldClassDecl->hasTrivialDestructor()) 2797 continue; 2798 2799 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2800 assert(Dtor && "No dtor found for FieldClassDecl!"); 2801 CheckDestructorAccess(Field->getLocation(), Dtor, 2802 PDiag(diag::err_access_dtor_field) 2803 << Field->getDeclName() 2804 << FieldType); 2805 2806 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2807 } 2808 2809 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2810 2811 // Bases. 2812 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2813 E = ClassDecl->bases_end(); Base != E; ++Base) { 2814 // Bases are always records in a well-formed non-dependent class. 2815 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2816 2817 // Remember direct virtual bases. 2818 if (Base->isVirtual()) 2819 DirectVirtualBases.insert(RT); 2820 2821 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2822 // If our base class is invalid, we probably can't get its dtor anyway. 2823 if (BaseClassDecl->isInvalidDecl()) 2824 continue; 2825 // Ignore trivial destructors. 2826 if (BaseClassDecl->hasTrivialDestructor()) 2827 continue; 2828 2829 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2830 assert(Dtor && "No dtor found for BaseClassDecl!"); 2831 2832 // FIXME: caret should be on the start of the class name 2833 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2834 PDiag(diag::err_access_dtor_base) 2835 << Base->getType() 2836 << Base->getSourceRange()); 2837 2838 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2839 } 2840 2841 // Virtual bases. 2842 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2843 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2844 2845 // Bases are always records in a well-formed non-dependent class. 2846 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2847 2848 // Ignore direct virtual bases. 2849 if (DirectVirtualBases.count(RT)) 2850 continue; 2851 2852 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2853 // If our base class is invalid, we probably can't get its dtor anyway. 2854 if (BaseClassDecl->isInvalidDecl()) 2855 continue; 2856 // Ignore trivial destructors. 2857 if (BaseClassDecl->hasTrivialDestructor()) 2858 continue; 2859 2860 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2861 assert(Dtor && "No dtor found for BaseClassDecl!"); 2862 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2863 PDiag(diag::err_access_dtor_vbase) 2864 << VBase->getType()); 2865 2866 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2867 } 2868} 2869 2870void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2871 if (!CDtorDecl) 2872 return; 2873 2874 if (CXXConstructorDecl *Constructor 2875 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2876 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2877} 2878 2879bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2880 unsigned DiagID, AbstractDiagSelID SelID) { 2881 if (SelID == -1) 2882 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2883 else 2884 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2885} 2886 2887bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2888 const PartialDiagnostic &PD) { 2889 if (!getLangOptions().CPlusPlus) 2890 return false; 2891 2892 if (const ArrayType *AT = Context.getAsArrayType(T)) 2893 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2894 2895 if (const PointerType *PT = T->getAs<PointerType>()) { 2896 // Find the innermost pointer type. 2897 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2898 PT = T; 2899 2900 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2901 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2902 } 2903 2904 const RecordType *RT = T->getAs<RecordType>(); 2905 if (!RT) 2906 return false; 2907 2908 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2909 2910 // We can't answer whether something is abstract until it has a 2911 // definition. If it's currently being defined, we'll walk back 2912 // over all the declarations when we have a full definition. 2913 const CXXRecordDecl *Def = RD->getDefinition(); 2914 if (!Def || Def->isBeingDefined()) 2915 return false; 2916 2917 if (!RD->isAbstract()) 2918 return false; 2919 2920 Diag(Loc, PD) << RD->getDeclName(); 2921 DiagnoseAbstractType(RD); 2922 2923 return true; 2924} 2925 2926void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2927 // Check if we've already emitted the list of pure virtual functions 2928 // for this class. 2929 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2930 return; 2931 2932 CXXFinalOverriderMap FinalOverriders; 2933 RD->getFinalOverriders(FinalOverriders); 2934 2935 // Keep a set of seen pure methods so we won't diagnose the same method 2936 // more than once. 2937 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2938 2939 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2940 MEnd = FinalOverriders.end(); 2941 M != MEnd; 2942 ++M) { 2943 for (OverridingMethods::iterator SO = M->second.begin(), 2944 SOEnd = M->second.end(); 2945 SO != SOEnd; ++SO) { 2946 // C++ [class.abstract]p4: 2947 // A class is abstract if it contains or inherits at least one 2948 // pure virtual function for which the final overrider is pure 2949 // virtual. 2950 2951 // 2952 if (SO->second.size() != 1) 2953 continue; 2954 2955 if (!SO->second.front().Method->isPure()) 2956 continue; 2957 2958 if (!SeenPureMethods.insert(SO->second.front().Method)) 2959 continue; 2960 2961 Diag(SO->second.front().Method->getLocation(), 2962 diag::note_pure_virtual_function) 2963 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2964 } 2965 } 2966 2967 if (!PureVirtualClassDiagSet) 2968 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2969 PureVirtualClassDiagSet->insert(RD); 2970} 2971 2972namespace { 2973struct AbstractUsageInfo { 2974 Sema &S; 2975 CXXRecordDecl *Record; 2976 CanQualType AbstractType; 2977 bool Invalid; 2978 2979 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2980 : S(S), Record(Record), 2981 AbstractType(S.Context.getCanonicalType( 2982 S.Context.getTypeDeclType(Record))), 2983 Invalid(false) {} 2984 2985 void DiagnoseAbstractType() { 2986 if (Invalid) return; 2987 S.DiagnoseAbstractType(Record); 2988 Invalid = true; 2989 } 2990 2991 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2992}; 2993 2994struct CheckAbstractUsage { 2995 AbstractUsageInfo &Info; 2996 const NamedDecl *Ctx; 2997 2998 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2999 : Info(Info), Ctx(Ctx) {} 3000 3001 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3002 switch (TL.getTypeLocClass()) { 3003#define ABSTRACT_TYPELOC(CLASS, PARENT) 3004#define TYPELOC(CLASS, PARENT) \ 3005 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3006#include "clang/AST/TypeLocNodes.def" 3007 } 3008 } 3009 3010 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3011 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3012 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3013 if (!TL.getArg(I)) 3014 continue; 3015 3016 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3017 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3018 } 3019 } 3020 3021 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3022 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3023 } 3024 3025 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3026 // Visit the type parameters from a permissive context. 3027 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3028 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3029 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3030 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3031 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3032 // TODO: other template argument types? 3033 } 3034 } 3035 3036 // Visit pointee types from a permissive context. 3037#define CheckPolymorphic(Type) \ 3038 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3039 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3040 } 3041 CheckPolymorphic(PointerTypeLoc) 3042 CheckPolymorphic(ReferenceTypeLoc) 3043 CheckPolymorphic(MemberPointerTypeLoc) 3044 CheckPolymorphic(BlockPointerTypeLoc) 3045 3046 /// Handle all the types we haven't given a more specific 3047 /// implementation for above. 3048 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3049 // Every other kind of type that we haven't called out already 3050 // that has an inner type is either (1) sugar or (2) contains that 3051 // inner type in some way as a subobject. 3052 if (TypeLoc Next = TL.getNextTypeLoc()) 3053 return Visit(Next, Sel); 3054 3055 // If there's no inner type and we're in a permissive context, 3056 // don't diagnose. 3057 if (Sel == Sema::AbstractNone) return; 3058 3059 // Check whether the type matches the abstract type. 3060 QualType T = TL.getType(); 3061 if (T->isArrayType()) { 3062 Sel = Sema::AbstractArrayType; 3063 T = Info.S.Context.getBaseElementType(T); 3064 } 3065 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3066 if (CT != Info.AbstractType) return; 3067 3068 // It matched; do some magic. 3069 if (Sel == Sema::AbstractArrayType) { 3070 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3071 << T << TL.getSourceRange(); 3072 } else { 3073 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3074 << Sel << T << TL.getSourceRange(); 3075 } 3076 Info.DiagnoseAbstractType(); 3077 } 3078}; 3079 3080void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3081 Sema::AbstractDiagSelID Sel) { 3082 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3083} 3084 3085} 3086 3087/// Check for invalid uses of an abstract type in a method declaration. 3088static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3089 CXXMethodDecl *MD) { 3090 // No need to do the check on definitions, which require that 3091 // the return/param types be complete. 3092 if (MD->doesThisDeclarationHaveABody()) 3093 return; 3094 3095 // For safety's sake, just ignore it if we don't have type source 3096 // information. This should never happen for non-implicit methods, 3097 // but... 3098 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3099 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3100} 3101 3102/// Check for invalid uses of an abstract type within a class definition. 3103static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3104 CXXRecordDecl *RD) { 3105 for (CXXRecordDecl::decl_iterator 3106 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3107 Decl *D = *I; 3108 if (D->isImplicit()) continue; 3109 3110 // Methods and method templates. 3111 if (isa<CXXMethodDecl>(D)) { 3112 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3113 } else if (isa<FunctionTemplateDecl>(D)) { 3114 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3115 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3116 3117 // Fields and static variables. 3118 } else if (isa<FieldDecl>(D)) { 3119 FieldDecl *FD = cast<FieldDecl>(D); 3120 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3121 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3122 } else if (isa<VarDecl>(D)) { 3123 VarDecl *VD = cast<VarDecl>(D); 3124 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3125 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3126 3127 // Nested classes and class templates. 3128 } else if (isa<CXXRecordDecl>(D)) { 3129 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3130 } else if (isa<ClassTemplateDecl>(D)) { 3131 CheckAbstractClassUsage(Info, 3132 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3133 } 3134 } 3135} 3136 3137/// \brief Perform semantic checks on a class definition that has been 3138/// completing, introducing implicitly-declared members, checking for 3139/// abstract types, etc. 3140void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3141 if (!Record) 3142 return; 3143 3144 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3145 AbstractUsageInfo Info(*this, Record); 3146 CheckAbstractClassUsage(Info, Record); 3147 } 3148 3149 // If this is not an aggregate type and has no user-declared constructor, 3150 // complain about any non-static data members of reference or const scalar 3151 // type, since they will never get initializers. 3152 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3153 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3154 bool Complained = false; 3155 for (RecordDecl::field_iterator F = Record->field_begin(), 3156 FEnd = Record->field_end(); 3157 F != FEnd; ++F) { 3158 if (F->hasInClassInitializer()) 3159 continue; 3160 3161 if (F->getType()->isReferenceType() || 3162 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3163 if (!Complained) { 3164 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3165 << Record->getTagKind() << Record; 3166 Complained = true; 3167 } 3168 3169 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3170 << F->getType()->isReferenceType() 3171 << F->getDeclName(); 3172 } 3173 } 3174 } 3175 3176 if (Record->isDynamicClass() && !Record->isDependentType()) 3177 DynamicClasses.push_back(Record); 3178 3179 if (Record->getIdentifier()) { 3180 // C++ [class.mem]p13: 3181 // If T is the name of a class, then each of the following shall have a 3182 // name different from T: 3183 // - every member of every anonymous union that is a member of class T. 3184 // 3185 // C++ [class.mem]p14: 3186 // In addition, if class T has a user-declared constructor (12.1), every 3187 // non-static data member of class T shall have a name different from T. 3188 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3189 R.first != R.second; ++R.first) { 3190 NamedDecl *D = *R.first; 3191 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3192 isa<IndirectFieldDecl>(D)) { 3193 Diag(D->getLocation(), diag::err_member_name_of_class) 3194 << D->getDeclName(); 3195 break; 3196 } 3197 } 3198 } 3199 3200 // Warn if the class has virtual methods but non-virtual public destructor. 3201 if (Record->isPolymorphic() && !Record->isDependentType()) { 3202 CXXDestructorDecl *dtor = Record->getDestructor(); 3203 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3204 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3205 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3206 } 3207 3208 // See if a method overloads virtual methods in a base 3209 /// class without overriding any. 3210 if (!Record->isDependentType()) { 3211 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3212 MEnd = Record->method_end(); 3213 M != MEnd; ++M) { 3214 if (!(*M)->isStatic()) 3215 DiagnoseHiddenVirtualMethods(Record, *M); 3216 } 3217 } 3218 3219 // Declare inherited constructors. We do this eagerly here because: 3220 // - The standard requires an eager diagnostic for conflicting inherited 3221 // constructors from different classes. 3222 // - The lazy declaration of the other implicit constructors is so as to not 3223 // waste space and performance on classes that are not meant to be 3224 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3225 // have inherited constructors. 3226 DeclareInheritedConstructors(Record); 3227 3228 if (!Record->isDependentType()) 3229 CheckExplicitlyDefaultedMethods(Record); 3230} 3231 3232void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3233 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3234 ME = Record->method_end(); 3235 MI != ME; ++MI) { 3236 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3237 switch (getSpecialMember(*MI)) { 3238 case CXXDefaultConstructor: 3239 CheckExplicitlyDefaultedDefaultConstructor( 3240 cast<CXXConstructorDecl>(*MI)); 3241 break; 3242 3243 case CXXDestructor: 3244 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3245 break; 3246 3247 case CXXCopyConstructor: 3248 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3249 break; 3250 3251 case CXXCopyAssignment: 3252 CheckExplicitlyDefaultedCopyAssignment(*MI); 3253 break; 3254 3255 case CXXMoveConstructor: 3256 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3257 break; 3258 3259 case CXXMoveAssignment: 3260 CheckExplicitlyDefaultedMoveAssignment(*MI); 3261 break; 3262 3263 case CXXInvalid: 3264 llvm_unreachable("non-special member explicitly defaulted!"); 3265 } 3266 } 3267 } 3268 3269} 3270 3271void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3272 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3273 3274 // Whether this was the first-declared instance of the constructor. 3275 // This affects whether we implicitly add an exception spec (and, eventually, 3276 // constexpr). It is also ill-formed to explicitly default a constructor such 3277 // that it would be deleted. (C++0x [decl.fct.def.default]) 3278 bool First = CD == CD->getCanonicalDecl(); 3279 3280 bool HadError = false; 3281 if (CD->getNumParams() != 0) { 3282 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3283 << CD->getSourceRange(); 3284 HadError = true; 3285 } 3286 3287 ImplicitExceptionSpecification Spec 3288 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3289 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3290 if (EPI.ExceptionSpecType == EST_Delayed) { 3291 // Exception specification depends on some deferred part of the class. We'll 3292 // try again when the class's definition has been fully processed. 3293 return; 3294 } 3295 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3296 *ExceptionType = Context.getFunctionType( 3297 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3298 3299 if (CtorType->hasExceptionSpec()) { 3300 if (CheckEquivalentExceptionSpec( 3301 PDiag(diag::err_incorrect_defaulted_exception_spec) 3302 << CXXDefaultConstructor, 3303 PDiag(), 3304 ExceptionType, SourceLocation(), 3305 CtorType, CD->getLocation())) { 3306 HadError = true; 3307 } 3308 } else if (First) { 3309 // We set the declaration to have the computed exception spec here. 3310 // We know there are no parameters. 3311 EPI.ExtInfo = CtorType->getExtInfo(); 3312 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3313 } 3314 3315 if (HadError) { 3316 CD->setInvalidDecl(); 3317 return; 3318 } 3319 3320 if (ShouldDeleteDefaultConstructor(CD)) { 3321 if (First) { 3322 CD->setDeletedAsWritten(); 3323 } else { 3324 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3325 << CXXDefaultConstructor; 3326 CD->setInvalidDecl(); 3327 } 3328 } 3329} 3330 3331void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3332 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3333 3334 // Whether this was the first-declared instance of the constructor. 3335 bool First = CD == CD->getCanonicalDecl(); 3336 3337 bool HadError = false; 3338 if (CD->getNumParams() != 1) { 3339 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3340 << CD->getSourceRange(); 3341 HadError = true; 3342 } 3343 3344 ImplicitExceptionSpecification Spec(Context); 3345 bool Const; 3346 llvm::tie(Spec, Const) = 3347 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3348 3349 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3350 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3351 *ExceptionType = Context.getFunctionType( 3352 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3353 3354 // Check for parameter type matching. 3355 // This is a copy ctor so we know it's a cv-qualified reference to T. 3356 QualType ArgType = CtorType->getArgType(0); 3357 if (ArgType->getPointeeType().isVolatileQualified()) { 3358 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3359 HadError = true; 3360 } 3361 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3362 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3363 HadError = true; 3364 } 3365 3366 if (CtorType->hasExceptionSpec()) { 3367 if (CheckEquivalentExceptionSpec( 3368 PDiag(diag::err_incorrect_defaulted_exception_spec) 3369 << CXXCopyConstructor, 3370 PDiag(), 3371 ExceptionType, SourceLocation(), 3372 CtorType, CD->getLocation())) { 3373 HadError = true; 3374 } 3375 } else if (First) { 3376 // We set the declaration to have the computed exception spec here. 3377 // We duplicate the one parameter type. 3378 EPI.ExtInfo = CtorType->getExtInfo(); 3379 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3380 } 3381 3382 if (HadError) { 3383 CD->setInvalidDecl(); 3384 return; 3385 } 3386 3387 if (ShouldDeleteCopyConstructor(CD)) { 3388 if (First) { 3389 CD->setDeletedAsWritten(); 3390 } else { 3391 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3392 << CXXCopyConstructor; 3393 CD->setInvalidDecl(); 3394 } 3395 } 3396} 3397 3398void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3399 assert(MD->isExplicitlyDefaulted()); 3400 3401 // Whether this was the first-declared instance of the operator 3402 bool First = MD == MD->getCanonicalDecl(); 3403 3404 bool HadError = false; 3405 if (MD->getNumParams() != 1) { 3406 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3407 << MD->getSourceRange(); 3408 HadError = true; 3409 } 3410 3411 QualType ReturnType = 3412 MD->getType()->getAs<FunctionType>()->getResultType(); 3413 if (!ReturnType->isLValueReferenceType() || 3414 !Context.hasSameType( 3415 Context.getCanonicalType(ReturnType->getPointeeType()), 3416 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3417 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3418 HadError = true; 3419 } 3420 3421 ImplicitExceptionSpecification Spec(Context); 3422 bool Const; 3423 llvm::tie(Spec, Const) = 3424 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3425 3426 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3427 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3428 *ExceptionType = Context.getFunctionType( 3429 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3430 3431 QualType ArgType = OperType->getArgType(0); 3432 if (!ArgType->isLValueReferenceType()) { 3433 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3434 HadError = true; 3435 } else { 3436 if (ArgType->getPointeeType().isVolatileQualified()) { 3437 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3438 HadError = true; 3439 } 3440 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3441 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3442 HadError = true; 3443 } 3444 } 3445 3446 if (OperType->getTypeQuals()) { 3447 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3448 HadError = true; 3449 } 3450 3451 if (OperType->hasExceptionSpec()) { 3452 if (CheckEquivalentExceptionSpec( 3453 PDiag(diag::err_incorrect_defaulted_exception_spec) 3454 << CXXCopyAssignment, 3455 PDiag(), 3456 ExceptionType, SourceLocation(), 3457 OperType, MD->getLocation())) { 3458 HadError = true; 3459 } 3460 } else if (First) { 3461 // We set the declaration to have the computed exception spec here. 3462 // We duplicate the one parameter type. 3463 EPI.RefQualifier = OperType->getRefQualifier(); 3464 EPI.ExtInfo = OperType->getExtInfo(); 3465 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3466 } 3467 3468 if (HadError) { 3469 MD->setInvalidDecl(); 3470 return; 3471 } 3472 3473 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3474 if (First) { 3475 MD->setDeletedAsWritten(); 3476 } else { 3477 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3478 << CXXCopyAssignment; 3479 MD->setInvalidDecl(); 3480 } 3481 } 3482} 3483 3484void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3485 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3486 3487 // Whether this was the first-declared instance of the constructor. 3488 bool First = CD == CD->getCanonicalDecl(); 3489 3490 bool HadError = false; 3491 if (CD->getNumParams() != 1) { 3492 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3493 << CD->getSourceRange(); 3494 HadError = true; 3495 } 3496 3497 ImplicitExceptionSpecification Spec( 3498 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3499 3500 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3501 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3502 *ExceptionType = Context.getFunctionType( 3503 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3504 3505 // Check for parameter type matching. 3506 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3507 QualType ArgType = CtorType->getArgType(0); 3508 if (ArgType->getPointeeType().isVolatileQualified()) { 3509 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3510 HadError = true; 3511 } 3512 if (ArgType->getPointeeType().isConstQualified()) { 3513 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3514 HadError = true; 3515 } 3516 3517 if (CtorType->hasExceptionSpec()) { 3518 if (CheckEquivalentExceptionSpec( 3519 PDiag(diag::err_incorrect_defaulted_exception_spec) 3520 << CXXMoveConstructor, 3521 PDiag(), 3522 ExceptionType, SourceLocation(), 3523 CtorType, CD->getLocation())) { 3524 HadError = true; 3525 } 3526 } else if (First) { 3527 // We set the declaration to have the computed exception spec here. 3528 // We duplicate the one parameter type. 3529 EPI.ExtInfo = CtorType->getExtInfo(); 3530 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3531 } 3532 3533 if (HadError) { 3534 CD->setInvalidDecl(); 3535 return; 3536 } 3537 3538 if (ShouldDeleteMoveConstructor(CD)) { 3539 if (First) { 3540 CD->setDeletedAsWritten(); 3541 } else { 3542 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3543 << CXXMoveConstructor; 3544 CD->setInvalidDecl(); 3545 } 3546 } 3547} 3548 3549void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3550 assert(MD->isExplicitlyDefaulted()); 3551 3552 // Whether this was the first-declared instance of the operator 3553 bool First = MD == MD->getCanonicalDecl(); 3554 3555 bool HadError = false; 3556 if (MD->getNumParams() != 1) { 3557 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3558 << MD->getSourceRange(); 3559 HadError = true; 3560 } 3561 3562 QualType ReturnType = 3563 MD->getType()->getAs<FunctionType>()->getResultType(); 3564 if (!ReturnType->isLValueReferenceType() || 3565 !Context.hasSameType( 3566 Context.getCanonicalType(ReturnType->getPointeeType()), 3567 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3568 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3569 HadError = true; 3570 } 3571 3572 ImplicitExceptionSpecification Spec( 3573 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3574 3575 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3576 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3577 *ExceptionType = Context.getFunctionType( 3578 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3579 3580 QualType ArgType = OperType->getArgType(0); 3581 if (!ArgType->isRValueReferenceType()) { 3582 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3583 HadError = true; 3584 } else { 3585 if (ArgType->getPointeeType().isVolatileQualified()) { 3586 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 3587 HadError = true; 3588 } 3589 if (ArgType->getPointeeType().isConstQualified()) { 3590 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 3591 HadError = true; 3592 } 3593 } 3594 3595 if (OperType->getTypeQuals()) { 3596 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 3597 HadError = true; 3598 } 3599 3600 if (OperType->hasExceptionSpec()) { 3601 if (CheckEquivalentExceptionSpec( 3602 PDiag(diag::err_incorrect_defaulted_exception_spec) 3603 << CXXMoveAssignment, 3604 PDiag(), 3605 ExceptionType, SourceLocation(), 3606 OperType, MD->getLocation())) { 3607 HadError = true; 3608 } 3609 } else if (First) { 3610 // We set the declaration to have the computed exception spec here. 3611 // We duplicate the one parameter type. 3612 EPI.RefQualifier = OperType->getRefQualifier(); 3613 EPI.ExtInfo = OperType->getExtInfo(); 3614 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3615 } 3616 3617 if (HadError) { 3618 MD->setInvalidDecl(); 3619 return; 3620 } 3621 3622 if (ShouldDeleteMoveAssignmentOperator(MD)) { 3623 if (First) { 3624 MD->setDeletedAsWritten(); 3625 } else { 3626 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3627 << CXXMoveAssignment; 3628 MD->setInvalidDecl(); 3629 } 3630 } 3631} 3632 3633void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3634 assert(DD->isExplicitlyDefaulted()); 3635 3636 // Whether this was the first-declared instance of the destructor. 3637 bool First = DD == DD->getCanonicalDecl(); 3638 3639 ImplicitExceptionSpecification Spec 3640 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3641 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3642 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3643 *ExceptionType = Context.getFunctionType( 3644 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3645 3646 if (DtorType->hasExceptionSpec()) { 3647 if (CheckEquivalentExceptionSpec( 3648 PDiag(diag::err_incorrect_defaulted_exception_spec) 3649 << CXXDestructor, 3650 PDiag(), 3651 ExceptionType, SourceLocation(), 3652 DtorType, DD->getLocation())) { 3653 DD->setInvalidDecl(); 3654 return; 3655 } 3656 } else if (First) { 3657 // We set the declaration to have the computed exception spec here. 3658 // There are no parameters. 3659 EPI.ExtInfo = DtorType->getExtInfo(); 3660 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3661 } 3662 3663 if (ShouldDeleteDestructor(DD)) { 3664 if (First) { 3665 DD->setDeletedAsWritten(); 3666 } else { 3667 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3668 << CXXDestructor; 3669 DD->setInvalidDecl(); 3670 } 3671 } 3672} 3673 3674bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3675 CXXRecordDecl *RD = CD->getParent(); 3676 assert(!RD->isDependentType() && "do deletion after instantiation"); 3677 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3678 return false; 3679 3680 SourceLocation Loc = CD->getLocation(); 3681 3682 // Do access control from the constructor 3683 ContextRAII CtorContext(*this, CD); 3684 3685 bool Union = RD->isUnion(); 3686 bool AllConst = true; 3687 3688 // We do this because we should never actually use an anonymous 3689 // union's constructor. 3690 if (Union && RD->isAnonymousStructOrUnion()) 3691 return false; 3692 3693 // FIXME: We should put some diagnostic logic right into this function. 3694 3695 // C++0x [class.ctor]/5 3696 // A defaulted default constructor for class X is defined as deleted if: 3697 3698 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3699 BE = RD->bases_end(); 3700 BI != BE; ++BI) { 3701 // We'll handle this one later 3702 if (BI->isVirtual()) 3703 continue; 3704 3705 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3706 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3707 3708 // -- any [direct base class] has a type with a destructor that is 3709 // deleted or inaccessible from the defaulted default constructor 3710 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3711 if (BaseDtor->isDeleted()) 3712 return true; 3713 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3714 AR_accessible) 3715 return true; 3716 3717 // -- any [direct base class either] has no default constructor or 3718 // overload resolution as applied to [its] default constructor 3719 // results in an ambiguity or in a function that is deleted or 3720 // inaccessible from the defaulted default constructor 3721 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3722 if (!BaseDefault || BaseDefault->isDeleted()) 3723 return true; 3724 3725 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3726 PDiag()) != AR_accessible) 3727 return true; 3728 } 3729 3730 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3731 BE = RD->vbases_end(); 3732 BI != BE; ++BI) { 3733 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3734 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3735 3736 // -- any [virtual base class] has a type with a destructor that is 3737 // delete or inaccessible from the defaulted default constructor 3738 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3739 if (BaseDtor->isDeleted()) 3740 return true; 3741 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3742 AR_accessible) 3743 return true; 3744 3745 // -- any [virtual base class either] has no default constructor or 3746 // overload resolution as applied to [its] default constructor 3747 // results in an ambiguity or in a function that is deleted or 3748 // inaccessible from the defaulted default constructor 3749 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3750 if (!BaseDefault || BaseDefault->isDeleted()) 3751 return true; 3752 3753 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3754 PDiag()) != AR_accessible) 3755 return true; 3756 } 3757 3758 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3759 FE = RD->field_end(); 3760 FI != FE; ++FI) { 3761 if (FI->isInvalidDecl()) 3762 continue; 3763 3764 QualType FieldType = Context.getBaseElementType(FI->getType()); 3765 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3766 3767 // -- any non-static data member with no brace-or-equal-initializer is of 3768 // reference type 3769 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3770 return true; 3771 3772 // -- X is a union and all its variant members are of const-qualified type 3773 // (or array thereof) 3774 if (Union && !FieldType.isConstQualified()) 3775 AllConst = false; 3776 3777 if (FieldRecord) { 3778 // -- X is a union-like class that has a variant member with a non-trivial 3779 // default constructor 3780 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3781 return true; 3782 3783 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3784 if (FieldDtor->isDeleted()) 3785 return true; 3786 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3787 AR_accessible) 3788 return true; 3789 3790 // -- any non-variant non-static data member of const-qualified type (or 3791 // array thereof) with no brace-or-equal-initializer does not have a 3792 // user-provided default constructor 3793 if (FieldType.isConstQualified() && 3794 !FI->hasInClassInitializer() && 3795 !FieldRecord->hasUserProvidedDefaultConstructor()) 3796 return true; 3797 3798 if (!Union && FieldRecord->isUnion() && 3799 FieldRecord->isAnonymousStructOrUnion()) { 3800 // We're okay to reuse AllConst here since we only care about the 3801 // value otherwise if we're in a union. 3802 AllConst = true; 3803 3804 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3805 UE = FieldRecord->field_end(); 3806 UI != UE; ++UI) { 3807 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3808 CXXRecordDecl *UnionFieldRecord = 3809 UnionFieldType->getAsCXXRecordDecl(); 3810 3811 if (!UnionFieldType.isConstQualified()) 3812 AllConst = false; 3813 3814 if (UnionFieldRecord && 3815 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3816 return true; 3817 } 3818 3819 if (AllConst) 3820 return true; 3821 3822 // Don't try to initialize the anonymous union 3823 // This is technically non-conformant, but sanity demands it. 3824 continue; 3825 } 3826 3827 // -- any non-static data member with no brace-or-equal-initializer has 3828 // class type M (or array thereof) and either M has no default 3829 // constructor or overload resolution as applied to M's default 3830 // constructor results in an ambiguity or in a function that is deleted 3831 // or inaccessible from the defaulted default constructor. 3832 if (!FI->hasInClassInitializer()) { 3833 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3834 if (!FieldDefault || FieldDefault->isDeleted()) 3835 return true; 3836 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3837 PDiag()) != AR_accessible) 3838 return true; 3839 } 3840 } else if (!Union && FieldType.isConstQualified() && 3841 !FI->hasInClassInitializer()) { 3842 // -- any non-variant non-static data member of const-qualified type (or 3843 // array thereof) with no brace-or-equal-initializer does not have a 3844 // user-provided default constructor 3845 return true; 3846 } 3847 } 3848 3849 if (Union && AllConst) 3850 return true; 3851 3852 return false; 3853} 3854 3855bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3856 CXXRecordDecl *RD = CD->getParent(); 3857 assert(!RD->isDependentType() && "do deletion after instantiation"); 3858 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3859 return false; 3860 3861 SourceLocation Loc = CD->getLocation(); 3862 3863 // Do access control from the constructor 3864 ContextRAII CtorContext(*this, CD); 3865 3866 bool Union = RD->isUnion(); 3867 3868 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3869 "copy assignment arg has no pointee type"); 3870 unsigned ArgQuals = 3871 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3872 Qualifiers::Const : 0; 3873 3874 // We do this because we should never actually use an anonymous 3875 // union's constructor. 3876 if (Union && RD->isAnonymousStructOrUnion()) 3877 return false; 3878 3879 // FIXME: We should put some diagnostic logic right into this function. 3880 3881 // C++0x [class.copy]/11 3882 // A defaulted [copy] constructor for class X is defined as delete if X has: 3883 3884 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3885 BE = RD->bases_end(); 3886 BI != BE; ++BI) { 3887 // We'll handle this one later 3888 if (BI->isVirtual()) 3889 continue; 3890 3891 QualType BaseType = BI->getType(); 3892 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3893 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3894 3895 // -- any [direct base class] of a type with a destructor that is deleted or 3896 // inaccessible from the defaulted constructor 3897 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3898 if (BaseDtor->isDeleted()) 3899 return true; 3900 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3901 AR_accessible) 3902 return true; 3903 3904 // -- a [direct base class] B that cannot be [copied] because overload 3905 // resolution, as applied to B's [copy] constructor, results in an 3906 // ambiguity or a function that is deleted or inaccessible from the 3907 // defaulted constructor 3908 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3909 if (!BaseCtor || BaseCtor->isDeleted()) 3910 return true; 3911 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3912 AR_accessible) 3913 return true; 3914 } 3915 3916 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3917 BE = RD->vbases_end(); 3918 BI != BE; ++BI) { 3919 QualType BaseType = BI->getType(); 3920 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3921 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3922 3923 // -- any [virtual base class] of a type with a destructor that is deleted or 3924 // inaccessible from the defaulted constructor 3925 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3926 if (BaseDtor->isDeleted()) 3927 return true; 3928 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3929 AR_accessible) 3930 return true; 3931 3932 // -- a [virtual base class] B that cannot be [copied] because overload 3933 // resolution, as applied to B's [copy] constructor, results in an 3934 // ambiguity or a function that is deleted or inaccessible from the 3935 // defaulted constructor 3936 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3937 if (!BaseCtor || BaseCtor->isDeleted()) 3938 return true; 3939 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3940 AR_accessible) 3941 return true; 3942 } 3943 3944 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3945 FE = RD->field_end(); 3946 FI != FE; ++FI) { 3947 QualType FieldType = Context.getBaseElementType(FI->getType()); 3948 3949 // -- for a copy constructor, a non-static data member of rvalue reference 3950 // type 3951 if (FieldType->isRValueReferenceType()) 3952 return true; 3953 3954 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3955 3956 if (FieldRecord) { 3957 // This is an anonymous union 3958 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3959 // Anonymous unions inside unions do not variant members create 3960 if (!Union) { 3961 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3962 UE = FieldRecord->field_end(); 3963 UI != UE; ++UI) { 3964 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3965 CXXRecordDecl *UnionFieldRecord = 3966 UnionFieldType->getAsCXXRecordDecl(); 3967 3968 // -- a variant member with a non-trivial [copy] constructor and X 3969 // is a union-like class 3970 if (UnionFieldRecord && 3971 !UnionFieldRecord->hasTrivialCopyConstructor()) 3972 return true; 3973 } 3974 } 3975 3976 // Don't try to initalize an anonymous union 3977 continue; 3978 } else { 3979 // -- a variant member with a non-trivial [copy] constructor and X is a 3980 // union-like class 3981 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3982 return true; 3983 3984 // -- any [non-static data member] of a type with a destructor that is 3985 // deleted or inaccessible from the defaulted constructor 3986 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3987 if (FieldDtor->isDeleted()) 3988 return true; 3989 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3990 AR_accessible) 3991 return true; 3992 } 3993 3994 // -- a [non-static data member of class type (or array thereof)] B that 3995 // cannot be [copied] because overload resolution, as applied to B's 3996 // [copy] constructor, results in an ambiguity or a function that is 3997 // deleted or inaccessible from the defaulted constructor 3998 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3999 ArgQuals); 4000 if (!FieldCtor || FieldCtor->isDeleted()) 4001 return true; 4002 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4003 PDiag()) != AR_accessible) 4004 return true; 4005 } 4006 } 4007 4008 return false; 4009} 4010 4011bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4012 CXXRecordDecl *RD = MD->getParent(); 4013 assert(!RD->isDependentType() && "do deletion after instantiation"); 4014 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4015 return false; 4016 4017 SourceLocation Loc = MD->getLocation(); 4018 4019 // Do access control from the constructor 4020 ContextRAII MethodContext(*this, MD); 4021 4022 bool Union = RD->isUnion(); 4023 4024 unsigned ArgQuals = 4025 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4026 Qualifiers::Const : 0; 4027 4028 // We do this because we should never actually use an anonymous 4029 // union's constructor. 4030 if (Union && RD->isAnonymousStructOrUnion()) 4031 return false; 4032 4033 // FIXME: We should put some diagnostic logic right into this function. 4034 4035 // C++0x [class.copy]/20 4036 // A defaulted [copy] assignment operator for class X is defined as deleted 4037 // if X has: 4038 4039 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4040 BE = RD->bases_end(); 4041 BI != BE; ++BI) { 4042 // We'll handle this one later 4043 if (BI->isVirtual()) 4044 continue; 4045 4046 QualType BaseType = BI->getType(); 4047 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4048 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4049 4050 // -- a [direct base class] B that cannot be [copied] because overload 4051 // resolution, as applied to B's [copy] assignment operator, results in 4052 // an ambiguity or a function that is deleted or inaccessible from the 4053 // assignment operator 4054 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4055 0); 4056 if (!CopyOper || CopyOper->isDeleted()) 4057 return true; 4058 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4059 return true; 4060 } 4061 4062 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4063 BE = RD->vbases_end(); 4064 BI != BE; ++BI) { 4065 QualType BaseType = BI->getType(); 4066 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4067 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4068 4069 // -- a [virtual base class] B that cannot be [copied] because overload 4070 // resolution, as applied to B's [copy] assignment operator, results in 4071 // an ambiguity or a function that is deleted or inaccessible from the 4072 // assignment operator 4073 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4074 0); 4075 if (!CopyOper || CopyOper->isDeleted()) 4076 return true; 4077 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4078 return true; 4079 } 4080 4081 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4082 FE = RD->field_end(); 4083 FI != FE; ++FI) { 4084 QualType FieldType = Context.getBaseElementType(FI->getType()); 4085 4086 // -- a non-static data member of reference type 4087 if (FieldType->isReferenceType()) 4088 return true; 4089 4090 // -- a non-static data member of const non-class type (or array thereof) 4091 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4092 return true; 4093 4094 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4095 4096 if (FieldRecord) { 4097 // This is an anonymous union 4098 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4099 // Anonymous unions inside unions do not variant members create 4100 if (!Union) { 4101 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4102 UE = FieldRecord->field_end(); 4103 UI != UE; ++UI) { 4104 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4105 CXXRecordDecl *UnionFieldRecord = 4106 UnionFieldType->getAsCXXRecordDecl(); 4107 4108 // -- a variant member with a non-trivial [copy] assignment operator 4109 // and X is a union-like class 4110 if (UnionFieldRecord && 4111 !UnionFieldRecord->hasTrivialCopyAssignment()) 4112 return true; 4113 } 4114 } 4115 4116 // Don't try to initalize an anonymous union 4117 continue; 4118 // -- a variant member with a non-trivial [copy] assignment operator 4119 // and X is a union-like class 4120 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4121 return true; 4122 } 4123 4124 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4125 false, 0); 4126 if (!CopyOper || CopyOper->isDeleted()) 4127 return true; 4128 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4129 return true; 4130 } 4131 } 4132 4133 return false; 4134} 4135 4136bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4137 CXXRecordDecl *RD = CD->getParent(); 4138 assert(!RD->isDependentType() && "do deletion after instantiation"); 4139 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4140 return false; 4141 4142 SourceLocation Loc = CD->getLocation(); 4143 4144 // Do access control from the constructor 4145 ContextRAII CtorContext(*this, CD); 4146 4147 bool Union = RD->isUnion(); 4148 4149 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4150 "copy assignment arg has no pointee type"); 4151 4152 // We do this because we should never actually use an anonymous 4153 // union's constructor. 4154 if (Union && RD->isAnonymousStructOrUnion()) 4155 return false; 4156 4157 // C++0x [class.copy]/11 4158 // A defaulted [move] constructor for class X is defined as deleted 4159 // if X has: 4160 4161 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4162 BE = RD->bases_end(); 4163 BI != BE; ++BI) { 4164 // We'll handle this one later 4165 if (BI->isVirtual()) 4166 continue; 4167 4168 QualType BaseType = BI->getType(); 4169 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4170 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4171 4172 // -- any [direct base class] of a type with a destructor that is deleted or 4173 // inaccessible from the defaulted constructor 4174 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4175 if (BaseDtor->isDeleted()) 4176 return true; 4177 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4178 AR_accessible) 4179 return true; 4180 4181 // -- a [direct base class] B that cannot be [moved] because overload 4182 // resolution, as applied to B's [move] constructor, results in an 4183 // ambiguity or a function that is deleted or inaccessible from the 4184 // defaulted constructor 4185 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4186 if (!BaseCtor || BaseCtor->isDeleted()) 4187 return true; 4188 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4189 AR_accessible) 4190 return true; 4191 4192 // -- for a move constructor, a [direct base class] with a type that 4193 // does not have a move constructor and is not trivially copyable. 4194 // If the field isn't a record, it's always trivially copyable. 4195 // A moving constructor could be a copy constructor instead. 4196 if (!BaseCtor->isMoveConstructor() && 4197 !BaseDecl->isTriviallyCopyable()) 4198 return true; 4199 } 4200 4201 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4202 BE = RD->vbases_end(); 4203 BI != BE; ++BI) { 4204 QualType BaseType = BI->getType(); 4205 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4206 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4207 4208 // -- any [virtual base class] of a type with a destructor that is deleted 4209 // or inaccessible from the defaulted constructor 4210 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4211 if (BaseDtor->isDeleted()) 4212 return true; 4213 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4214 AR_accessible) 4215 return true; 4216 4217 // -- a [virtual base class] B that cannot be [moved] because overload 4218 // resolution, as applied to B's [move] constructor, results in an 4219 // ambiguity or a function that is deleted or inaccessible from the 4220 // defaulted constructor 4221 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4222 if (!BaseCtor || BaseCtor->isDeleted()) 4223 return true; 4224 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4225 AR_accessible) 4226 return true; 4227 4228 // -- for a move constructor, a [virtual base class] with a type that 4229 // does not have a move constructor and is not trivially copyable. 4230 // If the field isn't a record, it's always trivially copyable. 4231 // A moving constructor could be a copy constructor instead. 4232 if (!BaseCtor->isMoveConstructor() && 4233 !BaseDecl->isTriviallyCopyable()) 4234 return true; 4235 } 4236 4237 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4238 FE = RD->field_end(); 4239 FI != FE; ++FI) { 4240 QualType FieldType = Context.getBaseElementType(FI->getType()); 4241 4242 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4243 // This is an anonymous union 4244 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4245 // Anonymous unions inside unions do not variant members create 4246 if (!Union) { 4247 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4248 UE = FieldRecord->field_end(); 4249 UI != UE; ++UI) { 4250 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4251 CXXRecordDecl *UnionFieldRecord = 4252 UnionFieldType->getAsCXXRecordDecl(); 4253 4254 // -- a variant member with a non-trivial [move] constructor and X 4255 // is a union-like class 4256 if (UnionFieldRecord && 4257 !UnionFieldRecord->hasTrivialMoveConstructor()) 4258 return true; 4259 } 4260 } 4261 4262 // Don't try to initalize an anonymous union 4263 continue; 4264 } else { 4265 // -- a variant member with a non-trivial [move] constructor and X is a 4266 // union-like class 4267 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4268 return true; 4269 4270 // -- any [non-static data member] of a type with a destructor that is 4271 // deleted or inaccessible from the defaulted constructor 4272 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4273 if (FieldDtor->isDeleted()) 4274 return true; 4275 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4276 AR_accessible) 4277 return true; 4278 } 4279 4280 // -- a [non-static data member of class type (or array thereof)] B that 4281 // cannot be [moved] because overload resolution, as applied to B's 4282 // [move] constructor, results in an ambiguity or a function that is 4283 // deleted or inaccessible from the defaulted constructor 4284 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4285 if (!FieldCtor || FieldCtor->isDeleted()) 4286 return true; 4287 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4288 PDiag()) != AR_accessible) 4289 return true; 4290 4291 // -- for a move constructor, a [non-static data member] with a type that 4292 // does not have a move constructor and is not trivially copyable. 4293 // If the field isn't a record, it's always trivially copyable. 4294 // A moving constructor could be a copy constructor instead. 4295 if (!FieldCtor->isMoveConstructor() && 4296 !FieldRecord->isTriviallyCopyable()) 4297 return true; 4298 } 4299 } 4300 4301 return false; 4302} 4303 4304bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4305 CXXRecordDecl *RD = MD->getParent(); 4306 assert(!RD->isDependentType() && "do deletion after instantiation"); 4307 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4308 return false; 4309 4310 SourceLocation Loc = MD->getLocation(); 4311 4312 // Do access control from the constructor 4313 ContextRAII MethodContext(*this, MD); 4314 4315 bool Union = RD->isUnion(); 4316 4317 // We do this because we should never actually use an anonymous 4318 // union's constructor. 4319 if (Union && RD->isAnonymousStructOrUnion()) 4320 return false; 4321 4322 // C++0x [class.copy]/20 4323 // A defaulted [move] assignment operator for class X is defined as deleted 4324 // if X has: 4325 4326 // -- for the move constructor, [...] any direct or indirect virtual base 4327 // class. 4328 if (RD->getNumVBases() != 0) 4329 return true; 4330 4331 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4332 BE = RD->bases_end(); 4333 BI != BE; ++BI) { 4334 4335 QualType BaseType = BI->getType(); 4336 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4337 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4338 4339 // -- a [direct base class] B that cannot be [moved] because overload 4340 // resolution, as applied to B's [move] assignment operator, results in 4341 // an ambiguity or a function that is deleted or inaccessible from the 4342 // assignment operator 4343 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4344 if (!MoveOper || MoveOper->isDeleted()) 4345 return true; 4346 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4347 return true; 4348 4349 // -- for the move assignment operator, a [direct base class] with a type 4350 // that does not have a move assignment operator and is not trivially 4351 // copyable. 4352 if (!MoveOper->isMoveAssignmentOperator() && 4353 !BaseDecl->isTriviallyCopyable()) 4354 return true; 4355 } 4356 4357 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4358 FE = RD->field_end(); 4359 FI != FE; ++FI) { 4360 QualType FieldType = Context.getBaseElementType(FI->getType()); 4361 4362 // -- a non-static data member of reference type 4363 if (FieldType->isReferenceType()) 4364 return true; 4365 4366 // -- a non-static data member of const non-class type (or array thereof) 4367 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4368 return true; 4369 4370 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4371 4372 if (FieldRecord) { 4373 // This is an anonymous union 4374 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4375 // Anonymous unions inside unions do not variant members create 4376 if (!Union) { 4377 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4378 UE = FieldRecord->field_end(); 4379 UI != UE; ++UI) { 4380 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4381 CXXRecordDecl *UnionFieldRecord = 4382 UnionFieldType->getAsCXXRecordDecl(); 4383 4384 // -- a variant member with a non-trivial [move] assignment operator 4385 // and X is a union-like class 4386 if (UnionFieldRecord && 4387 !UnionFieldRecord->hasTrivialMoveAssignment()) 4388 return true; 4389 } 4390 } 4391 4392 // Don't try to initalize an anonymous union 4393 continue; 4394 // -- a variant member with a non-trivial [move] assignment operator 4395 // and X is a union-like class 4396 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4397 return true; 4398 } 4399 4400 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4401 if (!MoveOper || MoveOper->isDeleted()) 4402 return true; 4403 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4404 return true; 4405 4406 // -- for the move assignment operator, a [non-static data member] with a 4407 // type that does not have a move assignment operator and is not 4408 // trivially copyable. 4409 if (!MoveOper->isMoveAssignmentOperator() && 4410 !FieldRecord->isTriviallyCopyable()) 4411 return true; 4412 } 4413 } 4414 4415 return false; 4416} 4417 4418bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4419 CXXRecordDecl *RD = DD->getParent(); 4420 assert(!RD->isDependentType() && "do deletion after instantiation"); 4421 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4422 return false; 4423 4424 SourceLocation Loc = DD->getLocation(); 4425 4426 // Do access control from the destructor 4427 ContextRAII CtorContext(*this, DD); 4428 4429 bool Union = RD->isUnion(); 4430 4431 // We do this because we should never actually use an anonymous 4432 // union's destructor. 4433 if (Union && RD->isAnonymousStructOrUnion()) 4434 return false; 4435 4436 // C++0x [class.dtor]p5 4437 // A defaulted destructor for a class X is defined as deleted if: 4438 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4439 BE = RD->bases_end(); 4440 BI != BE; ++BI) { 4441 // We'll handle this one later 4442 if (BI->isVirtual()) 4443 continue; 4444 4445 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4446 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4447 assert(BaseDtor && "base has no destructor"); 4448 4449 // -- any direct or virtual base class has a deleted destructor or 4450 // a destructor that is inaccessible from the defaulted destructor 4451 if (BaseDtor->isDeleted()) 4452 return true; 4453 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4454 AR_accessible) 4455 return true; 4456 } 4457 4458 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4459 BE = RD->vbases_end(); 4460 BI != BE; ++BI) { 4461 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4462 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4463 assert(BaseDtor && "base has no destructor"); 4464 4465 // -- any direct or virtual base class has a deleted destructor or 4466 // a destructor that is inaccessible from the defaulted destructor 4467 if (BaseDtor->isDeleted()) 4468 return true; 4469 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4470 AR_accessible) 4471 return true; 4472 } 4473 4474 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4475 FE = RD->field_end(); 4476 FI != FE; ++FI) { 4477 QualType FieldType = Context.getBaseElementType(FI->getType()); 4478 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4479 if (FieldRecord) { 4480 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4481 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4482 UE = FieldRecord->field_end(); 4483 UI != UE; ++UI) { 4484 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4485 CXXRecordDecl *UnionFieldRecord = 4486 UnionFieldType->getAsCXXRecordDecl(); 4487 4488 // -- X is a union-like class that has a variant member with a non- 4489 // trivial destructor. 4490 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4491 return true; 4492 } 4493 // Technically we are supposed to do this next check unconditionally. 4494 // But that makes absolutely no sense. 4495 } else { 4496 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4497 4498 // -- any of the non-static data members has class type M (or array 4499 // thereof) and M has a deleted destructor or a destructor that is 4500 // inaccessible from the defaulted destructor 4501 if (FieldDtor->isDeleted()) 4502 return true; 4503 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4504 AR_accessible) 4505 return true; 4506 4507 // -- X is a union-like class that has a variant member with a non- 4508 // trivial destructor. 4509 if (Union && !FieldDtor->isTrivial()) 4510 return true; 4511 } 4512 } 4513 } 4514 4515 if (DD->isVirtual()) { 4516 FunctionDecl *OperatorDelete = 0; 4517 DeclarationName Name = 4518 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4519 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4520 false)) 4521 return true; 4522 } 4523 4524 4525 return false; 4526} 4527 4528/// \brief Data used with FindHiddenVirtualMethod 4529namespace { 4530 struct FindHiddenVirtualMethodData { 4531 Sema *S; 4532 CXXMethodDecl *Method; 4533 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4534 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4535 }; 4536} 4537 4538/// \brief Member lookup function that determines whether a given C++ 4539/// method overloads virtual methods in a base class without overriding any, 4540/// to be used with CXXRecordDecl::lookupInBases(). 4541static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4542 CXXBasePath &Path, 4543 void *UserData) { 4544 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4545 4546 FindHiddenVirtualMethodData &Data 4547 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4548 4549 DeclarationName Name = Data.Method->getDeclName(); 4550 assert(Name.getNameKind() == DeclarationName::Identifier); 4551 4552 bool foundSameNameMethod = false; 4553 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4554 for (Path.Decls = BaseRecord->lookup(Name); 4555 Path.Decls.first != Path.Decls.second; 4556 ++Path.Decls.first) { 4557 NamedDecl *D = *Path.Decls.first; 4558 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4559 MD = MD->getCanonicalDecl(); 4560 foundSameNameMethod = true; 4561 // Interested only in hidden virtual methods. 4562 if (!MD->isVirtual()) 4563 continue; 4564 // If the method we are checking overrides a method from its base 4565 // don't warn about the other overloaded methods. 4566 if (!Data.S->IsOverload(Data.Method, MD, false)) 4567 return true; 4568 // Collect the overload only if its hidden. 4569 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4570 overloadedMethods.push_back(MD); 4571 } 4572 } 4573 4574 if (foundSameNameMethod) 4575 Data.OverloadedMethods.append(overloadedMethods.begin(), 4576 overloadedMethods.end()); 4577 return foundSameNameMethod; 4578} 4579 4580/// \brief See if a method overloads virtual methods in a base class without 4581/// overriding any. 4582void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4583 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4584 MD->getLocation()) == Diagnostic::Ignored) 4585 return; 4586 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4587 return; 4588 4589 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4590 /*bool RecordPaths=*/false, 4591 /*bool DetectVirtual=*/false); 4592 FindHiddenVirtualMethodData Data; 4593 Data.Method = MD; 4594 Data.S = this; 4595 4596 // Keep the base methods that were overriden or introduced in the subclass 4597 // by 'using' in a set. A base method not in this set is hidden. 4598 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4599 res.first != res.second; ++res.first) { 4600 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4601 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4602 E = MD->end_overridden_methods(); 4603 I != E; ++I) 4604 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4605 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4606 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4607 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4608 } 4609 4610 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4611 !Data.OverloadedMethods.empty()) { 4612 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4613 << MD << (Data.OverloadedMethods.size() > 1); 4614 4615 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4616 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4617 Diag(overloadedMD->getLocation(), 4618 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4619 } 4620 } 4621} 4622 4623void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4624 Decl *TagDecl, 4625 SourceLocation LBrac, 4626 SourceLocation RBrac, 4627 AttributeList *AttrList) { 4628 if (!TagDecl) 4629 return; 4630 4631 AdjustDeclIfTemplate(TagDecl); 4632 4633 ActOnFields(S, RLoc, TagDecl, 4634 // strict aliasing violation! 4635 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4636 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4637 4638 CheckCompletedCXXClass( 4639 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4640} 4641 4642/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4643/// special functions, such as the default constructor, copy 4644/// constructor, or destructor, to the given C++ class (C++ 4645/// [special]p1). This routine can only be executed just before the 4646/// definition of the class is complete. 4647void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4648 if (!ClassDecl->hasUserDeclaredConstructor()) 4649 ++ASTContext::NumImplicitDefaultConstructors; 4650 4651 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4652 ++ASTContext::NumImplicitCopyConstructors; 4653 4654 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4655 ++ASTContext::NumImplicitCopyAssignmentOperators; 4656 4657 // If we have a dynamic class, then the copy assignment operator may be 4658 // virtual, so we have to declare it immediately. This ensures that, e.g., 4659 // it shows up in the right place in the vtable and that we diagnose 4660 // problems with the implicit exception specification. 4661 if (ClassDecl->isDynamicClass()) 4662 DeclareImplicitCopyAssignment(ClassDecl); 4663 } 4664 4665 if (!ClassDecl->hasUserDeclaredDestructor()) { 4666 ++ASTContext::NumImplicitDestructors; 4667 4668 // If we have a dynamic class, then the destructor may be virtual, so we 4669 // have to declare the destructor immediately. This ensures that, e.g., it 4670 // shows up in the right place in the vtable and that we diagnose problems 4671 // with the implicit exception specification. 4672 if (ClassDecl->isDynamicClass()) 4673 DeclareImplicitDestructor(ClassDecl); 4674 } 4675} 4676 4677void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4678 if (!D) 4679 return; 4680 4681 int NumParamList = D->getNumTemplateParameterLists(); 4682 for (int i = 0; i < NumParamList; i++) { 4683 TemplateParameterList* Params = D->getTemplateParameterList(i); 4684 for (TemplateParameterList::iterator Param = Params->begin(), 4685 ParamEnd = Params->end(); 4686 Param != ParamEnd; ++Param) { 4687 NamedDecl *Named = cast<NamedDecl>(*Param); 4688 if (Named->getDeclName()) { 4689 S->AddDecl(Named); 4690 IdResolver.AddDecl(Named); 4691 } 4692 } 4693 } 4694} 4695 4696void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4697 if (!D) 4698 return; 4699 4700 TemplateParameterList *Params = 0; 4701 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4702 Params = Template->getTemplateParameters(); 4703 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4704 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4705 Params = PartialSpec->getTemplateParameters(); 4706 else 4707 return; 4708 4709 for (TemplateParameterList::iterator Param = Params->begin(), 4710 ParamEnd = Params->end(); 4711 Param != ParamEnd; ++Param) { 4712 NamedDecl *Named = cast<NamedDecl>(*Param); 4713 if (Named->getDeclName()) { 4714 S->AddDecl(Named); 4715 IdResolver.AddDecl(Named); 4716 } 4717 } 4718} 4719 4720void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4721 if (!RecordD) return; 4722 AdjustDeclIfTemplate(RecordD); 4723 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4724 PushDeclContext(S, Record); 4725} 4726 4727void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4728 if (!RecordD) return; 4729 PopDeclContext(); 4730} 4731 4732/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4733/// parsing a top-level (non-nested) C++ class, and we are now 4734/// parsing those parts of the given Method declaration that could 4735/// not be parsed earlier (C++ [class.mem]p2), such as default 4736/// arguments. This action should enter the scope of the given 4737/// Method declaration as if we had just parsed the qualified method 4738/// name. However, it should not bring the parameters into scope; 4739/// that will be performed by ActOnDelayedCXXMethodParameter. 4740void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4741} 4742 4743/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4744/// C++ method declaration. We're (re-)introducing the given 4745/// function parameter into scope for use in parsing later parts of 4746/// the method declaration. For example, we could see an 4747/// ActOnParamDefaultArgument event for this parameter. 4748void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4749 if (!ParamD) 4750 return; 4751 4752 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4753 4754 // If this parameter has an unparsed default argument, clear it out 4755 // to make way for the parsed default argument. 4756 if (Param->hasUnparsedDefaultArg()) 4757 Param->setDefaultArg(0); 4758 4759 S->AddDecl(Param); 4760 if (Param->getDeclName()) 4761 IdResolver.AddDecl(Param); 4762} 4763 4764/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4765/// processing the delayed method declaration for Method. The method 4766/// declaration is now considered finished. There may be a separate 4767/// ActOnStartOfFunctionDef action later (not necessarily 4768/// immediately!) for this method, if it was also defined inside the 4769/// class body. 4770void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4771 if (!MethodD) 4772 return; 4773 4774 AdjustDeclIfTemplate(MethodD); 4775 4776 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4777 4778 // Now that we have our default arguments, check the constructor 4779 // again. It could produce additional diagnostics or affect whether 4780 // the class has implicitly-declared destructors, among other 4781 // things. 4782 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4783 CheckConstructor(Constructor); 4784 4785 // Check the default arguments, which we may have added. 4786 if (!Method->isInvalidDecl()) 4787 CheckCXXDefaultArguments(Method); 4788} 4789 4790/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4791/// the well-formedness of the constructor declarator @p D with type @p 4792/// R. If there are any errors in the declarator, this routine will 4793/// emit diagnostics and set the invalid bit to true. In any case, the type 4794/// will be updated to reflect a well-formed type for the constructor and 4795/// returned. 4796QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4797 StorageClass &SC) { 4798 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4799 4800 // C++ [class.ctor]p3: 4801 // A constructor shall not be virtual (10.3) or static (9.4). A 4802 // constructor can be invoked for a const, volatile or const 4803 // volatile object. A constructor shall not be declared const, 4804 // volatile, or const volatile (9.3.2). 4805 if (isVirtual) { 4806 if (!D.isInvalidType()) 4807 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4808 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4809 << SourceRange(D.getIdentifierLoc()); 4810 D.setInvalidType(); 4811 } 4812 if (SC == SC_Static) { 4813 if (!D.isInvalidType()) 4814 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4815 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4816 << SourceRange(D.getIdentifierLoc()); 4817 D.setInvalidType(); 4818 SC = SC_None; 4819 } 4820 4821 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4822 if (FTI.TypeQuals != 0) { 4823 if (FTI.TypeQuals & Qualifiers::Const) 4824 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4825 << "const" << SourceRange(D.getIdentifierLoc()); 4826 if (FTI.TypeQuals & Qualifiers::Volatile) 4827 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4828 << "volatile" << SourceRange(D.getIdentifierLoc()); 4829 if (FTI.TypeQuals & Qualifiers::Restrict) 4830 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4831 << "restrict" << SourceRange(D.getIdentifierLoc()); 4832 D.setInvalidType(); 4833 } 4834 4835 // C++0x [class.ctor]p4: 4836 // A constructor shall not be declared with a ref-qualifier. 4837 if (FTI.hasRefQualifier()) { 4838 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4839 << FTI.RefQualifierIsLValueRef 4840 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4841 D.setInvalidType(); 4842 } 4843 4844 // Rebuild the function type "R" without any type qualifiers (in 4845 // case any of the errors above fired) and with "void" as the 4846 // return type, since constructors don't have return types. 4847 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4848 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4849 return R; 4850 4851 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4852 EPI.TypeQuals = 0; 4853 EPI.RefQualifier = RQ_None; 4854 4855 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4856 Proto->getNumArgs(), EPI); 4857} 4858 4859/// CheckConstructor - Checks a fully-formed constructor for 4860/// well-formedness, issuing any diagnostics required. Returns true if 4861/// the constructor declarator is invalid. 4862void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4863 CXXRecordDecl *ClassDecl 4864 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4865 if (!ClassDecl) 4866 return Constructor->setInvalidDecl(); 4867 4868 // C++ [class.copy]p3: 4869 // A declaration of a constructor for a class X is ill-formed if 4870 // its first parameter is of type (optionally cv-qualified) X and 4871 // either there are no other parameters or else all other 4872 // parameters have default arguments. 4873 if (!Constructor->isInvalidDecl() && 4874 ((Constructor->getNumParams() == 1) || 4875 (Constructor->getNumParams() > 1 && 4876 Constructor->getParamDecl(1)->hasDefaultArg())) && 4877 Constructor->getTemplateSpecializationKind() 4878 != TSK_ImplicitInstantiation) { 4879 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4880 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4881 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4882 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4883 const char *ConstRef 4884 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4885 : " const &"; 4886 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4887 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4888 4889 // FIXME: Rather that making the constructor invalid, we should endeavor 4890 // to fix the type. 4891 Constructor->setInvalidDecl(); 4892 } 4893 } 4894} 4895 4896/// CheckDestructor - Checks a fully-formed destructor definition for 4897/// well-formedness, issuing any diagnostics required. Returns true 4898/// on error. 4899bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4900 CXXRecordDecl *RD = Destructor->getParent(); 4901 4902 if (Destructor->isVirtual()) { 4903 SourceLocation Loc; 4904 4905 if (!Destructor->isImplicit()) 4906 Loc = Destructor->getLocation(); 4907 else 4908 Loc = RD->getLocation(); 4909 4910 // If we have a virtual destructor, look up the deallocation function 4911 FunctionDecl *OperatorDelete = 0; 4912 DeclarationName Name = 4913 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4914 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4915 return true; 4916 4917 MarkDeclarationReferenced(Loc, OperatorDelete); 4918 4919 Destructor->setOperatorDelete(OperatorDelete); 4920 } 4921 4922 return false; 4923} 4924 4925static inline bool 4926FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4927 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4928 FTI.ArgInfo[0].Param && 4929 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4930} 4931 4932/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4933/// the well-formednes of the destructor declarator @p D with type @p 4934/// R. If there are any errors in the declarator, this routine will 4935/// emit diagnostics and set the declarator to invalid. Even if this happens, 4936/// will be updated to reflect a well-formed type for the destructor and 4937/// returned. 4938QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4939 StorageClass& SC) { 4940 // C++ [class.dtor]p1: 4941 // [...] A typedef-name that names a class is a class-name 4942 // (7.1.3); however, a typedef-name that names a class shall not 4943 // be used as the identifier in the declarator for a destructor 4944 // declaration. 4945 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4946 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4947 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4948 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4949 else if (const TemplateSpecializationType *TST = 4950 DeclaratorType->getAs<TemplateSpecializationType>()) 4951 if (TST->isTypeAlias()) 4952 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4953 << DeclaratorType << 1; 4954 4955 // C++ [class.dtor]p2: 4956 // A destructor is used to destroy objects of its class type. A 4957 // destructor takes no parameters, and no return type can be 4958 // specified for it (not even void). The address of a destructor 4959 // shall not be taken. A destructor shall not be static. A 4960 // destructor can be invoked for a const, volatile or const 4961 // volatile object. A destructor shall not be declared const, 4962 // volatile or const volatile (9.3.2). 4963 if (SC == SC_Static) { 4964 if (!D.isInvalidType()) 4965 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4966 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4967 << SourceRange(D.getIdentifierLoc()) 4968 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4969 4970 SC = SC_None; 4971 } 4972 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4973 // Destructors don't have return types, but the parser will 4974 // happily parse something like: 4975 // 4976 // class X { 4977 // float ~X(); 4978 // }; 4979 // 4980 // The return type will be eliminated later. 4981 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4982 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4983 << SourceRange(D.getIdentifierLoc()); 4984 } 4985 4986 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4987 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4988 if (FTI.TypeQuals & Qualifiers::Const) 4989 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4990 << "const" << SourceRange(D.getIdentifierLoc()); 4991 if (FTI.TypeQuals & Qualifiers::Volatile) 4992 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4993 << "volatile" << SourceRange(D.getIdentifierLoc()); 4994 if (FTI.TypeQuals & Qualifiers::Restrict) 4995 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4996 << "restrict" << SourceRange(D.getIdentifierLoc()); 4997 D.setInvalidType(); 4998 } 4999 5000 // C++0x [class.dtor]p2: 5001 // A destructor shall not be declared with a ref-qualifier. 5002 if (FTI.hasRefQualifier()) { 5003 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5004 << FTI.RefQualifierIsLValueRef 5005 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5006 D.setInvalidType(); 5007 } 5008 5009 // Make sure we don't have any parameters. 5010 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5011 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5012 5013 // Delete the parameters. 5014 FTI.freeArgs(); 5015 D.setInvalidType(); 5016 } 5017 5018 // Make sure the destructor isn't variadic. 5019 if (FTI.isVariadic) { 5020 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5021 D.setInvalidType(); 5022 } 5023 5024 // Rebuild the function type "R" without any type qualifiers or 5025 // parameters (in case any of the errors above fired) and with 5026 // "void" as the return type, since destructors don't have return 5027 // types. 5028 if (!D.isInvalidType()) 5029 return R; 5030 5031 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5032 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5033 EPI.Variadic = false; 5034 EPI.TypeQuals = 0; 5035 EPI.RefQualifier = RQ_None; 5036 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5037} 5038 5039/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5040/// well-formednes of the conversion function declarator @p D with 5041/// type @p R. If there are any errors in the declarator, this routine 5042/// will emit diagnostics and return true. Otherwise, it will return 5043/// false. Either way, the type @p R will be updated to reflect a 5044/// well-formed type for the conversion operator. 5045void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5046 StorageClass& SC) { 5047 // C++ [class.conv.fct]p1: 5048 // Neither parameter types nor return type can be specified. The 5049 // type of a conversion function (8.3.5) is "function taking no 5050 // parameter returning conversion-type-id." 5051 if (SC == SC_Static) { 5052 if (!D.isInvalidType()) 5053 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5054 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5055 << SourceRange(D.getIdentifierLoc()); 5056 D.setInvalidType(); 5057 SC = SC_None; 5058 } 5059 5060 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5061 5062 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5063 // Conversion functions don't have return types, but the parser will 5064 // happily parse something like: 5065 // 5066 // class X { 5067 // float operator bool(); 5068 // }; 5069 // 5070 // The return type will be changed later anyway. 5071 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5072 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5073 << SourceRange(D.getIdentifierLoc()); 5074 D.setInvalidType(); 5075 } 5076 5077 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5078 5079 // Make sure we don't have any parameters. 5080 if (Proto->getNumArgs() > 0) { 5081 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5082 5083 // Delete the parameters. 5084 D.getFunctionTypeInfo().freeArgs(); 5085 D.setInvalidType(); 5086 } else if (Proto->isVariadic()) { 5087 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5088 D.setInvalidType(); 5089 } 5090 5091 // Diagnose "&operator bool()" and other such nonsense. This 5092 // is actually a gcc extension which we don't support. 5093 if (Proto->getResultType() != ConvType) { 5094 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5095 << Proto->getResultType(); 5096 D.setInvalidType(); 5097 ConvType = Proto->getResultType(); 5098 } 5099 5100 // C++ [class.conv.fct]p4: 5101 // The conversion-type-id shall not represent a function type nor 5102 // an array type. 5103 if (ConvType->isArrayType()) { 5104 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5105 ConvType = Context.getPointerType(ConvType); 5106 D.setInvalidType(); 5107 } else if (ConvType->isFunctionType()) { 5108 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5109 ConvType = Context.getPointerType(ConvType); 5110 D.setInvalidType(); 5111 } 5112 5113 // Rebuild the function type "R" without any parameters (in case any 5114 // of the errors above fired) and with the conversion type as the 5115 // return type. 5116 if (D.isInvalidType()) 5117 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5118 5119 // C++0x explicit conversion operators. 5120 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5121 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5122 diag::warn_explicit_conversion_functions) 5123 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5124} 5125 5126/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5127/// the declaration of the given C++ conversion function. This routine 5128/// is responsible for recording the conversion function in the C++ 5129/// class, if possible. 5130Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5131 assert(Conversion && "Expected to receive a conversion function declaration"); 5132 5133 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5134 5135 // Make sure we aren't redeclaring the conversion function. 5136 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5137 5138 // C++ [class.conv.fct]p1: 5139 // [...] A conversion function is never used to convert a 5140 // (possibly cv-qualified) object to the (possibly cv-qualified) 5141 // same object type (or a reference to it), to a (possibly 5142 // cv-qualified) base class of that type (or a reference to it), 5143 // or to (possibly cv-qualified) void. 5144 // FIXME: Suppress this warning if the conversion function ends up being a 5145 // virtual function that overrides a virtual function in a base class. 5146 QualType ClassType 5147 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5148 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5149 ConvType = ConvTypeRef->getPointeeType(); 5150 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5151 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5152 /* Suppress diagnostics for instantiations. */; 5153 else if (ConvType->isRecordType()) { 5154 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5155 if (ConvType == ClassType) 5156 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5157 << ClassType; 5158 else if (IsDerivedFrom(ClassType, ConvType)) 5159 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5160 << ClassType << ConvType; 5161 } else if (ConvType->isVoidType()) { 5162 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5163 << ClassType << ConvType; 5164 } 5165 5166 if (FunctionTemplateDecl *ConversionTemplate 5167 = Conversion->getDescribedFunctionTemplate()) 5168 return ConversionTemplate; 5169 5170 return Conversion; 5171} 5172 5173//===----------------------------------------------------------------------===// 5174// Namespace Handling 5175//===----------------------------------------------------------------------===// 5176 5177 5178 5179/// ActOnStartNamespaceDef - This is called at the start of a namespace 5180/// definition. 5181Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5182 SourceLocation InlineLoc, 5183 SourceLocation NamespaceLoc, 5184 SourceLocation IdentLoc, 5185 IdentifierInfo *II, 5186 SourceLocation LBrace, 5187 AttributeList *AttrList) { 5188 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5189 // For anonymous namespace, take the location of the left brace. 5190 SourceLocation Loc = II ? IdentLoc : LBrace; 5191 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5192 StartLoc, Loc, II); 5193 Namespc->setInline(InlineLoc.isValid()); 5194 5195 Scope *DeclRegionScope = NamespcScope->getParent(); 5196 5197 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5198 5199 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5200 PushNamespaceVisibilityAttr(Attr); 5201 5202 if (II) { 5203 // C++ [namespace.def]p2: 5204 // The identifier in an original-namespace-definition shall not 5205 // have been previously defined in the declarative region in 5206 // which the original-namespace-definition appears. The 5207 // identifier in an original-namespace-definition is the name of 5208 // the namespace. Subsequently in that declarative region, it is 5209 // treated as an original-namespace-name. 5210 // 5211 // Since namespace names are unique in their scope, and we don't 5212 // look through using directives, just look for any ordinary names. 5213 5214 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5215 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5216 Decl::IDNS_Namespace; 5217 NamedDecl *PrevDecl = 0; 5218 for (DeclContext::lookup_result R 5219 = CurContext->getRedeclContext()->lookup(II); 5220 R.first != R.second; ++R.first) { 5221 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5222 PrevDecl = *R.first; 5223 break; 5224 } 5225 } 5226 5227 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5228 // This is an extended namespace definition. 5229 if (Namespc->isInline() != OrigNS->isInline()) { 5230 // inline-ness must match 5231 if (OrigNS->isInline()) { 5232 // The user probably just forgot the 'inline', so suggest that it 5233 // be added back. 5234 Diag(Namespc->getLocation(), 5235 diag::warn_inline_namespace_reopened_noninline) 5236 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5237 } else { 5238 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5239 << Namespc->isInline(); 5240 } 5241 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5242 5243 // Recover by ignoring the new namespace's inline status. 5244 Namespc->setInline(OrigNS->isInline()); 5245 } 5246 5247 // Attach this namespace decl to the chain of extended namespace 5248 // definitions. 5249 OrigNS->setNextNamespace(Namespc); 5250 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5251 5252 // Remove the previous declaration from the scope. 5253 if (DeclRegionScope->isDeclScope(OrigNS)) { 5254 IdResolver.RemoveDecl(OrigNS); 5255 DeclRegionScope->RemoveDecl(OrigNS); 5256 } 5257 } else if (PrevDecl) { 5258 // This is an invalid name redefinition. 5259 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5260 << Namespc->getDeclName(); 5261 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5262 Namespc->setInvalidDecl(); 5263 // Continue on to push Namespc as current DeclContext and return it. 5264 } else if (II->isStr("std") && 5265 CurContext->getRedeclContext()->isTranslationUnit()) { 5266 // This is the first "real" definition of the namespace "std", so update 5267 // our cache of the "std" namespace to point at this definition. 5268 if (NamespaceDecl *StdNS = getStdNamespace()) { 5269 // We had already defined a dummy namespace "std". Link this new 5270 // namespace definition to the dummy namespace "std". 5271 StdNS->setNextNamespace(Namespc); 5272 StdNS->setLocation(IdentLoc); 5273 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5274 } 5275 5276 // Make our StdNamespace cache point at the first real definition of the 5277 // "std" namespace. 5278 StdNamespace = Namespc; 5279 5280 // Add this instance of "std" to the set of known namespaces 5281 KnownNamespaces[Namespc] = false; 5282 } else if (!Namespc->isInline()) { 5283 // Since this is an "original" namespace, add it to the known set of 5284 // namespaces if it is not an inline namespace. 5285 KnownNamespaces[Namespc] = false; 5286 } 5287 5288 PushOnScopeChains(Namespc, DeclRegionScope); 5289 } else { 5290 // Anonymous namespaces. 5291 assert(Namespc->isAnonymousNamespace()); 5292 5293 // Link the anonymous namespace into its parent. 5294 NamespaceDecl *PrevDecl; 5295 DeclContext *Parent = CurContext->getRedeclContext(); 5296 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5297 PrevDecl = TU->getAnonymousNamespace(); 5298 TU->setAnonymousNamespace(Namespc); 5299 } else { 5300 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5301 PrevDecl = ND->getAnonymousNamespace(); 5302 ND->setAnonymousNamespace(Namespc); 5303 } 5304 5305 // Link the anonymous namespace with its previous declaration. 5306 if (PrevDecl) { 5307 assert(PrevDecl->isAnonymousNamespace()); 5308 assert(!PrevDecl->getNextNamespace()); 5309 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5310 PrevDecl->setNextNamespace(Namespc); 5311 5312 if (Namespc->isInline() != PrevDecl->isInline()) { 5313 // inline-ness must match 5314 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5315 << Namespc->isInline(); 5316 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5317 Namespc->setInvalidDecl(); 5318 // Recover by ignoring the new namespace's inline status. 5319 Namespc->setInline(PrevDecl->isInline()); 5320 } 5321 } 5322 5323 CurContext->addDecl(Namespc); 5324 5325 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5326 // behaves as if it were replaced by 5327 // namespace unique { /* empty body */ } 5328 // using namespace unique; 5329 // namespace unique { namespace-body } 5330 // where all occurrences of 'unique' in a translation unit are 5331 // replaced by the same identifier and this identifier differs 5332 // from all other identifiers in the entire program. 5333 5334 // We just create the namespace with an empty name and then add an 5335 // implicit using declaration, just like the standard suggests. 5336 // 5337 // CodeGen enforces the "universally unique" aspect by giving all 5338 // declarations semantically contained within an anonymous 5339 // namespace internal linkage. 5340 5341 if (!PrevDecl) { 5342 UsingDirectiveDecl* UD 5343 = UsingDirectiveDecl::Create(Context, CurContext, 5344 /* 'using' */ LBrace, 5345 /* 'namespace' */ SourceLocation(), 5346 /* qualifier */ NestedNameSpecifierLoc(), 5347 /* identifier */ SourceLocation(), 5348 Namespc, 5349 /* Ancestor */ CurContext); 5350 UD->setImplicit(); 5351 CurContext->addDecl(UD); 5352 } 5353 } 5354 5355 // Although we could have an invalid decl (i.e. the namespace name is a 5356 // redefinition), push it as current DeclContext and try to continue parsing. 5357 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5358 // for the namespace has the declarations that showed up in that particular 5359 // namespace definition. 5360 PushDeclContext(NamespcScope, Namespc); 5361 return Namespc; 5362} 5363 5364/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5365/// is a namespace alias, returns the namespace it points to. 5366static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5367 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5368 return AD->getNamespace(); 5369 return dyn_cast_or_null<NamespaceDecl>(D); 5370} 5371 5372/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5373/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5374void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5375 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5376 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5377 Namespc->setRBraceLoc(RBrace); 5378 PopDeclContext(); 5379 if (Namespc->hasAttr<VisibilityAttr>()) 5380 PopPragmaVisibility(); 5381} 5382 5383CXXRecordDecl *Sema::getStdBadAlloc() const { 5384 return cast_or_null<CXXRecordDecl>( 5385 StdBadAlloc.get(Context.getExternalSource())); 5386} 5387 5388NamespaceDecl *Sema::getStdNamespace() const { 5389 return cast_or_null<NamespaceDecl>( 5390 StdNamespace.get(Context.getExternalSource())); 5391} 5392 5393/// \brief Retrieve the special "std" namespace, which may require us to 5394/// implicitly define the namespace. 5395NamespaceDecl *Sema::getOrCreateStdNamespace() { 5396 if (!StdNamespace) { 5397 // The "std" namespace has not yet been defined, so build one implicitly. 5398 StdNamespace = NamespaceDecl::Create(Context, 5399 Context.getTranslationUnitDecl(), 5400 SourceLocation(), SourceLocation(), 5401 &PP.getIdentifierTable().get("std")); 5402 getStdNamespace()->setImplicit(true); 5403 } 5404 5405 return getStdNamespace(); 5406} 5407 5408/// \brief Determine whether a using statement is in a context where it will be 5409/// apply in all contexts. 5410static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5411 switch (CurContext->getDeclKind()) { 5412 case Decl::TranslationUnit: 5413 return true; 5414 case Decl::LinkageSpec: 5415 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5416 default: 5417 return false; 5418 } 5419} 5420 5421static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5422 CXXScopeSpec &SS, 5423 SourceLocation IdentLoc, 5424 IdentifierInfo *Ident) { 5425 R.clear(); 5426 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5427 R.getLookupKind(), Sc, &SS, NULL, 5428 false, S.CTC_NoKeywords, NULL)) { 5429 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5430 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5431 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5432 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5433 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5434 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5435 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5436 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5437 else 5438 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5439 << Ident << CorrectedQuotedStr 5440 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5441 5442 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5443 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5444 5445 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5446 R.addDecl(Corrected.getCorrectionDecl()); 5447 return true; 5448 } 5449 R.setLookupName(Ident); 5450 } 5451 return false; 5452} 5453 5454Decl *Sema::ActOnUsingDirective(Scope *S, 5455 SourceLocation UsingLoc, 5456 SourceLocation NamespcLoc, 5457 CXXScopeSpec &SS, 5458 SourceLocation IdentLoc, 5459 IdentifierInfo *NamespcName, 5460 AttributeList *AttrList) { 5461 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5462 assert(NamespcName && "Invalid NamespcName."); 5463 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5464 5465 // This can only happen along a recovery path. 5466 while (S->getFlags() & Scope::TemplateParamScope) 5467 S = S->getParent(); 5468 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5469 5470 UsingDirectiveDecl *UDir = 0; 5471 NestedNameSpecifier *Qualifier = 0; 5472 if (SS.isSet()) 5473 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5474 5475 // Lookup namespace name. 5476 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5477 LookupParsedName(R, S, &SS); 5478 if (R.isAmbiguous()) 5479 return 0; 5480 5481 if (R.empty()) { 5482 R.clear(); 5483 // Allow "using namespace std;" or "using namespace ::std;" even if 5484 // "std" hasn't been defined yet, for GCC compatibility. 5485 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5486 NamespcName->isStr("std")) { 5487 Diag(IdentLoc, diag::ext_using_undefined_std); 5488 R.addDecl(getOrCreateStdNamespace()); 5489 R.resolveKind(); 5490 } 5491 // Otherwise, attempt typo correction. 5492 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5493 } 5494 5495 if (!R.empty()) { 5496 NamedDecl *Named = R.getFoundDecl(); 5497 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5498 && "expected namespace decl"); 5499 // C++ [namespace.udir]p1: 5500 // A using-directive specifies that the names in the nominated 5501 // namespace can be used in the scope in which the 5502 // using-directive appears after the using-directive. During 5503 // unqualified name lookup (3.4.1), the names appear as if they 5504 // were declared in the nearest enclosing namespace which 5505 // contains both the using-directive and the nominated 5506 // namespace. [Note: in this context, "contains" means "contains 5507 // directly or indirectly". ] 5508 5509 // Find enclosing context containing both using-directive and 5510 // nominated namespace. 5511 NamespaceDecl *NS = getNamespaceDecl(Named); 5512 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5513 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5514 CommonAncestor = CommonAncestor->getParent(); 5515 5516 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5517 SS.getWithLocInContext(Context), 5518 IdentLoc, Named, CommonAncestor); 5519 5520 if (IsUsingDirectiveInToplevelContext(CurContext) && 5521 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5522 Diag(IdentLoc, diag::warn_using_directive_in_header); 5523 } 5524 5525 PushUsingDirective(S, UDir); 5526 } else { 5527 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5528 } 5529 5530 // FIXME: We ignore attributes for now. 5531 return UDir; 5532} 5533 5534void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5535 // If scope has associated entity, then using directive is at namespace 5536 // or translation unit scope. We add UsingDirectiveDecls, into 5537 // it's lookup structure. 5538 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5539 Ctx->addDecl(UDir); 5540 else 5541 // Otherwise it is block-sope. using-directives will affect lookup 5542 // only to the end of scope. 5543 S->PushUsingDirective(UDir); 5544} 5545 5546 5547Decl *Sema::ActOnUsingDeclaration(Scope *S, 5548 AccessSpecifier AS, 5549 bool HasUsingKeyword, 5550 SourceLocation UsingLoc, 5551 CXXScopeSpec &SS, 5552 UnqualifiedId &Name, 5553 AttributeList *AttrList, 5554 bool IsTypeName, 5555 SourceLocation TypenameLoc) { 5556 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5557 5558 switch (Name.getKind()) { 5559 case UnqualifiedId::IK_ImplicitSelfParam: 5560 case UnqualifiedId::IK_Identifier: 5561 case UnqualifiedId::IK_OperatorFunctionId: 5562 case UnqualifiedId::IK_LiteralOperatorId: 5563 case UnqualifiedId::IK_ConversionFunctionId: 5564 break; 5565 5566 case UnqualifiedId::IK_ConstructorName: 5567 case UnqualifiedId::IK_ConstructorTemplateId: 5568 // C++0x inherited constructors. 5569 if (getLangOptions().CPlusPlus0x) break; 5570 5571 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5572 << SS.getRange(); 5573 return 0; 5574 5575 case UnqualifiedId::IK_DestructorName: 5576 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5577 << SS.getRange(); 5578 return 0; 5579 5580 case UnqualifiedId::IK_TemplateId: 5581 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5582 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5583 return 0; 5584 } 5585 5586 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5587 DeclarationName TargetName = TargetNameInfo.getName(); 5588 if (!TargetName) 5589 return 0; 5590 5591 // Warn about using declarations. 5592 // TODO: store that the declaration was written without 'using' and 5593 // talk about access decls instead of using decls in the 5594 // diagnostics. 5595 if (!HasUsingKeyword) { 5596 UsingLoc = Name.getSourceRange().getBegin(); 5597 5598 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5599 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5600 } 5601 5602 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5603 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5604 return 0; 5605 5606 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5607 TargetNameInfo, AttrList, 5608 /* IsInstantiation */ false, 5609 IsTypeName, TypenameLoc); 5610 if (UD) 5611 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5612 5613 return UD; 5614} 5615 5616/// \brief Determine whether a using declaration considers the given 5617/// declarations as "equivalent", e.g., if they are redeclarations of 5618/// the same entity or are both typedefs of the same type. 5619static bool 5620IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5621 bool &SuppressRedeclaration) { 5622 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5623 SuppressRedeclaration = false; 5624 return true; 5625 } 5626 5627 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5628 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5629 SuppressRedeclaration = true; 5630 return Context.hasSameType(TD1->getUnderlyingType(), 5631 TD2->getUnderlyingType()); 5632 } 5633 5634 return false; 5635} 5636 5637 5638/// Determines whether to create a using shadow decl for a particular 5639/// decl, given the set of decls existing prior to this using lookup. 5640bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5641 const LookupResult &Previous) { 5642 // Diagnose finding a decl which is not from a base class of the 5643 // current class. We do this now because there are cases where this 5644 // function will silently decide not to build a shadow decl, which 5645 // will pre-empt further diagnostics. 5646 // 5647 // We don't need to do this in C++0x because we do the check once on 5648 // the qualifier. 5649 // 5650 // FIXME: diagnose the following if we care enough: 5651 // struct A { int foo; }; 5652 // struct B : A { using A::foo; }; 5653 // template <class T> struct C : A {}; 5654 // template <class T> struct D : C<T> { using B::foo; } // <--- 5655 // This is invalid (during instantiation) in C++03 because B::foo 5656 // resolves to the using decl in B, which is not a base class of D<T>. 5657 // We can't diagnose it immediately because C<T> is an unknown 5658 // specialization. The UsingShadowDecl in D<T> then points directly 5659 // to A::foo, which will look well-formed when we instantiate. 5660 // The right solution is to not collapse the shadow-decl chain. 5661 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5662 DeclContext *OrigDC = Orig->getDeclContext(); 5663 5664 // Handle enums and anonymous structs. 5665 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5666 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5667 while (OrigRec->isAnonymousStructOrUnion()) 5668 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5669 5670 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5671 if (OrigDC == CurContext) { 5672 Diag(Using->getLocation(), 5673 diag::err_using_decl_nested_name_specifier_is_current_class) 5674 << Using->getQualifierLoc().getSourceRange(); 5675 Diag(Orig->getLocation(), diag::note_using_decl_target); 5676 return true; 5677 } 5678 5679 Diag(Using->getQualifierLoc().getBeginLoc(), 5680 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5681 << Using->getQualifier() 5682 << cast<CXXRecordDecl>(CurContext) 5683 << Using->getQualifierLoc().getSourceRange(); 5684 Diag(Orig->getLocation(), diag::note_using_decl_target); 5685 return true; 5686 } 5687 } 5688 5689 if (Previous.empty()) return false; 5690 5691 NamedDecl *Target = Orig; 5692 if (isa<UsingShadowDecl>(Target)) 5693 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5694 5695 // If the target happens to be one of the previous declarations, we 5696 // don't have a conflict. 5697 // 5698 // FIXME: but we might be increasing its access, in which case we 5699 // should redeclare it. 5700 NamedDecl *NonTag = 0, *Tag = 0; 5701 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5702 I != E; ++I) { 5703 NamedDecl *D = (*I)->getUnderlyingDecl(); 5704 bool Result; 5705 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5706 return Result; 5707 5708 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5709 } 5710 5711 if (Target->isFunctionOrFunctionTemplate()) { 5712 FunctionDecl *FD; 5713 if (isa<FunctionTemplateDecl>(Target)) 5714 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5715 else 5716 FD = cast<FunctionDecl>(Target); 5717 5718 NamedDecl *OldDecl = 0; 5719 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5720 case Ovl_Overload: 5721 return false; 5722 5723 case Ovl_NonFunction: 5724 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5725 break; 5726 5727 // We found a decl with the exact signature. 5728 case Ovl_Match: 5729 // If we're in a record, we want to hide the target, so we 5730 // return true (without a diagnostic) to tell the caller not to 5731 // build a shadow decl. 5732 if (CurContext->isRecord()) 5733 return true; 5734 5735 // If we're not in a record, this is an error. 5736 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5737 break; 5738 } 5739 5740 Diag(Target->getLocation(), diag::note_using_decl_target); 5741 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5742 return true; 5743 } 5744 5745 // Target is not a function. 5746 5747 if (isa<TagDecl>(Target)) { 5748 // No conflict between a tag and a non-tag. 5749 if (!Tag) return false; 5750 5751 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5752 Diag(Target->getLocation(), diag::note_using_decl_target); 5753 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5754 return true; 5755 } 5756 5757 // No conflict between a tag and a non-tag. 5758 if (!NonTag) return false; 5759 5760 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5761 Diag(Target->getLocation(), diag::note_using_decl_target); 5762 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5763 return true; 5764} 5765 5766/// Builds a shadow declaration corresponding to a 'using' declaration. 5767UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5768 UsingDecl *UD, 5769 NamedDecl *Orig) { 5770 5771 // If we resolved to another shadow declaration, just coalesce them. 5772 NamedDecl *Target = Orig; 5773 if (isa<UsingShadowDecl>(Target)) { 5774 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5775 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5776 } 5777 5778 UsingShadowDecl *Shadow 5779 = UsingShadowDecl::Create(Context, CurContext, 5780 UD->getLocation(), UD, Target); 5781 UD->addShadowDecl(Shadow); 5782 5783 Shadow->setAccess(UD->getAccess()); 5784 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5785 Shadow->setInvalidDecl(); 5786 5787 if (S) 5788 PushOnScopeChains(Shadow, S); 5789 else 5790 CurContext->addDecl(Shadow); 5791 5792 5793 return Shadow; 5794} 5795 5796/// Hides a using shadow declaration. This is required by the current 5797/// using-decl implementation when a resolvable using declaration in a 5798/// class is followed by a declaration which would hide or override 5799/// one or more of the using decl's targets; for example: 5800/// 5801/// struct Base { void foo(int); }; 5802/// struct Derived : Base { 5803/// using Base::foo; 5804/// void foo(int); 5805/// }; 5806/// 5807/// The governing language is C++03 [namespace.udecl]p12: 5808/// 5809/// When a using-declaration brings names from a base class into a 5810/// derived class scope, member functions in the derived class 5811/// override and/or hide member functions with the same name and 5812/// parameter types in a base class (rather than conflicting). 5813/// 5814/// There are two ways to implement this: 5815/// (1) optimistically create shadow decls when they're not hidden 5816/// by existing declarations, or 5817/// (2) don't create any shadow decls (or at least don't make them 5818/// visible) until we've fully parsed/instantiated the class. 5819/// The problem with (1) is that we might have to retroactively remove 5820/// a shadow decl, which requires several O(n) operations because the 5821/// decl structures are (very reasonably) not designed for removal. 5822/// (2) avoids this but is very fiddly and phase-dependent. 5823void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5824 if (Shadow->getDeclName().getNameKind() == 5825 DeclarationName::CXXConversionFunctionName) 5826 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5827 5828 // Remove it from the DeclContext... 5829 Shadow->getDeclContext()->removeDecl(Shadow); 5830 5831 // ...and the scope, if applicable... 5832 if (S) { 5833 S->RemoveDecl(Shadow); 5834 IdResolver.RemoveDecl(Shadow); 5835 } 5836 5837 // ...and the using decl. 5838 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5839 5840 // TODO: complain somehow if Shadow was used. It shouldn't 5841 // be possible for this to happen, because...? 5842} 5843 5844/// Builds a using declaration. 5845/// 5846/// \param IsInstantiation - Whether this call arises from an 5847/// instantiation of an unresolved using declaration. We treat 5848/// the lookup differently for these declarations. 5849NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5850 SourceLocation UsingLoc, 5851 CXXScopeSpec &SS, 5852 const DeclarationNameInfo &NameInfo, 5853 AttributeList *AttrList, 5854 bool IsInstantiation, 5855 bool IsTypeName, 5856 SourceLocation TypenameLoc) { 5857 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5858 SourceLocation IdentLoc = NameInfo.getLoc(); 5859 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5860 5861 // FIXME: We ignore attributes for now. 5862 5863 if (SS.isEmpty()) { 5864 Diag(IdentLoc, diag::err_using_requires_qualname); 5865 return 0; 5866 } 5867 5868 // Do the redeclaration lookup in the current scope. 5869 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5870 ForRedeclaration); 5871 Previous.setHideTags(false); 5872 if (S) { 5873 LookupName(Previous, S); 5874 5875 // It is really dumb that we have to do this. 5876 LookupResult::Filter F = Previous.makeFilter(); 5877 while (F.hasNext()) { 5878 NamedDecl *D = F.next(); 5879 if (!isDeclInScope(D, CurContext, S)) 5880 F.erase(); 5881 } 5882 F.done(); 5883 } else { 5884 assert(IsInstantiation && "no scope in non-instantiation"); 5885 assert(CurContext->isRecord() && "scope not record in instantiation"); 5886 LookupQualifiedName(Previous, CurContext); 5887 } 5888 5889 // Check for invalid redeclarations. 5890 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5891 return 0; 5892 5893 // Check for bad qualifiers. 5894 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5895 return 0; 5896 5897 DeclContext *LookupContext = computeDeclContext(SS); 5898 NamedDecl *D; 5899 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5900 if (!LookupContext) { 5901 if (IsTypeName) { 5902 // FIXME: not all declaration name kinds are legal here 5903 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5904 UsingLoc, TypenameLoc, 5905 QualifierLoc, 5906 IdentLoc, NameInfo.getName()); 5907 } else { 5908 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5909 QualifierLoc, NameInfo); 5910 } 5911 } else { 5912 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5913 NameInfo, IsTypeName); 5914 } 5915 D->setAccess(AS); 5916 CurContext->addDecl(D); 5917 5918 if (!LookupContext) return D; 5919 UsingDecl *UD = cast<UsingDecl>(D); 5920 5921 if (RequireCompleteDeclContext(SS, LookupContext)) { 5922 UD->setInvalidDecl(); 5923 return UD; 5924 } 5925 5926 // Constructor inheriting using decls get special treatment. 5927 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5928 if (CheckInheritedConstructorUsingDecl(UD)) 5929 UD->setInvalidDecl(); 5930 return UD; 5931 } 5932 5933 // Otherwise, look up the target name. 5934 5935 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5936 5937 // Unlike most lookups, we don't always want to hide tag 5938 // declarations: tag names are visible through the using declaration 5939 // even if hidden by ordinary names, *except* in a dependent context 5940 // where it's important for the sanity of two-phase lookup. 5941 if (!IsInstantiation) 5942 R.setHideTags(false); 5943 5944 LookupQualifiedName(R, LookupContext); 5945 5946 if (R.empty()) { 5947 Diag(IdentLoc, diag::err_no_member) 5948 << NameInfo.getName() << LookupContext << SS.getRange(); 5949 UD->setInvalidDecl(); 5950 return UD; 5951 } 5952 5953 if (R.isAmbiguous()) { 5954 UD->setInvalidDecl(); 5955 return UD; 5956 } 5957 5958 if (IsTypeName) { 5959 // If we asked for a typename and got a non-type decl, error out. 5960 if (!R.getAsSingle<TypeDecl>()) { 5961 Diag(IdentLoc, diag::err_using_typename_non_type); 5962 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5963 Diag((*I)->getUnderlyingDecl()->getLocation(), 5964 diag::note_using_decl_target); 5965 UD->setInvalidDecl(); 5966 return UD; 5967 } 5968 } else { 5969 // If we asked for a non-typename and we got a type, error out, 5970 // but only if this is an instantiation of an unresolved using 5971 // decl. Otherwise just silently find the type name. 5972 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5973 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5974 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5975 UD->setInvalidDecl(); 5976 return UD; 5977 } 5978 } 5979 5980 // C++0x N2914 [namespace.udecl]p6: 5981 // A using-declaration shall not name a namespace. 5982 if (R.getAsSingle<NamespaceDecl>()) { 5983 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5984 << SS.getRange(); 5985 UD->setInvalidDecl(); 5986 return UD; 5987 } 5988 5989 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5990 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5991 BuildUsingShadowDecl(S, UD, *I); 5992 } 5993 5994 return UD; 5995} 5996 5997/// Additional checks for a using declaration referring to a constructor name. 5998bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5999 if (UD->isTypeName()) { 6000 // FIXME: Cannot specify typename when specifying constructor 6001 return true; 6002 } 6003 6004 const Type *SourceType = UD->getQualifier()->getAsType(); 6005 assert(SourceType && 6006 "Using decl naming constructor doesn't have type in scope spec."); 6007 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6008 6009 // Check whether the named type is a direct base class. 6010 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6011 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6012 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6013 BaseIt != BaseE; ++BaseIt) { 6014 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6015 if (CanonicalSourceType == BaseType) 6016 break; 6017 } 6018 6019 if (BaseIt == BaseE) { 6020 // Did not find SourceType in the bases. 6021 Diag(UD->getUsingLocation(), 6022 diag::err_using_decl_constructor_not_in_direct_base) 6023 << UD->getNameInfo().getSourceRange() 6024 << QualType(SourceType, 0) << TargetClass; 6025 return true; 6026 } 6027 6028 BaseIt->setInheritConstructors(); 6029 6030 return false; 6031} 6032 6033/// Checks that the given using declaration is not an invalid 6034/// redeclaration. Note that this is checking only for the using decl 6035/// itself, not for any ill-formedness among the UsingShadowDecls. 6036bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6037 bool isTypeName, 6038 const CXXScopeSpec &SS, 6039 SourceLocation NameLoc, 6040 const LookupResult &Prev) { 6041 // C++03 [namespace.udecl]p8: 6042 // C++0x [namespace.udecl]p10: 6043 // A using-declaration is a declaration and can therefore be used 6044 // repeatedly where (and only where) multiple declarations are 6045 // allowed. 6046 // 6047 // That's in non-member contexts. 6048 if (!CurContext->getRedeclContext()->isRecord()) 6049 return false; 6050 6051 NestedNameSpecifier *Qual 6052 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6053 6054 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6055 NamedDecl *D = *I; 6056 6057 bool DTypename; 6058 NestedNameSpecifier *DQual; 6059 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6060 DTypename = UD->isTypeName(); 6061 DQual = UD->getQualifier(); 6062 } else if (UnresolvedUsingValueDecl *UD 6063 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6064 DTypename = false; 6065 DQual = UD->getQualifier(); 6066 } else if (UnresolvedUsingTypenameDecl *UD 6067 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6068 DTypename = true; 6069 DQual = UD->getQualifier(); 6070 } else continue; 6071 6072 // using decls differ if one says 'typename' and the other doesn't. 6073 // FIXME: non-dependent using decls? 6074 if (isTypeName != DTypename) continue; 6075 6076 // using decls differ if they name different scopes (but note that 6077 // template instantiation can cause this check to trigger when it 6078 // didn't before instantiation). 6079 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6080 Context.getCanonicalNestedNameSpecifier(DQual)) 6081 continue; 6082 6083 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6084 Diag(D->getLocation(), diag::note_using_decl) << 1; 6085 return true; 6086 } 6087 6088 return false; 6089} 6090 6091 6092/// Checks that the given nested-name qualifier used in a using decl 6093/// in the current context is appropriately related to the current 6094/// scope. If an error is found, diagnoses it and returns true. 6095bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6096 const CXXScopeSpec &SS, 6097 SourceLocation NameLoc) { 6098 DeclContext *NamedContext = computeDeclContext(SS); 6099 6100 if (!CurContext->isRecord()) { 6101 // C++03 [namespace.udecl]p3: 6102 // C++0x [namespace.udecl]p8: 6103 // A using-declaration for a class member shall be a member-declaration. 6104 6105 // If we weren't able to compute a valid scope, it must be a 6106 // dependent class scope. 6107 if (!NamedContext || NamedContext->isRecord()) { 6108 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6109 << SS.getRange(); 6110 return true; 6111 } 6112 6113 // Otherwise, everything is known to be fine. 6114 return false; 6115 } 6116 6117 // The current scope is a record. 6118 6119 // If the named context is dependent, we can't decide much. 6120 if (!NamedContext) { 6121 // FIXME: in C++0x, we can diagnose if we can prove that the 6122 // nested-name-specifier does not refer to a base class, which is 6123 // still possible in some cases. 6124 6125 // Otherwise we have to conservatively report that things might be 6126 // okay. 6127 return false; 6128 } 6129 6130 if (!NamedContext->isRecord()) { 6131 // Ideally this would point at the last name in the specifier, 6132 // but we don't have that level of source info. 6133 Diag(SS.getRange().getBegin(), 6134 diag::err_using_decl_nested_name_specifier_is_not_class) 6135 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6136 return true; 6137 } 6138 6139 if (!NamedContext->isDependentContext() && 6140 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6141 return true; 6142 6143 if (getLangOptions().CPlusPlus0x) { 6144 // C++0x [namespace.udecl]p3: 6145 // In a using-declaration used as a member-declaration, the 6146 // nested-name-specifier shall name a base class of the class 6147 // being defined. 6148 6149 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6150 cast<CXXRecordDecl>(NamedContext))) { 6151 if (CurContext == NamedContext) { 6152 Diag(NameLoc, 6153 diag::err_using_decl_nested_name_specifier_is_current_class) 6154 << SS.getRange(); 6155 return true; 6156 } 6157 6158 Diag(SS.getRange().getBegin(), 6159 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6160 << (NestedNameSpecifier*) SS.getScopeRep() 6161 << cast<CXXRecordDecl>(CurContext) 6162 << SS.getRange(); 6163 return true; 6164 } 6165 6166 return false; 6167 } 6168 6169 // C++03 [namespace.udecl]p4: 6170 // A using-declaration used as a member-declaration shall refer 6171 // to a member of a base class of the class being defined [etc.]. 6172 6173 // Salient point: SS doesn't have to name a base class as long as 6174 // lookup only finds members from base classes. Therefore we can 6175 // diagnose here only if we can prove that that can't happen, 6176 // i.e. if the class hierarchies provably don't intersect. 6177 6178 // TODO: it would be nice if "definitely valid" results were cached 6179 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6180 // need to be repeated. 6181 6182 struct UserData { 6183 llvm::DenseSet<const CXXRecordDecl*> Bases; 6184 6185 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6186 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6187 Data->Bases.insert(Base); 6188 return true; 6189 } 6190 6191 bool hasDependentBases(const CXXRecordDecl *Class) { 6192 return !Class->forallBases(collect, this); 6193 } 6194 6195 /// Returns true if the base is dependent or is one of the 6196 /// accumulated base classes. 6197 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6198 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6199 return !Data->Bases.count(Base); 6200 } 6201 6202 bool mightShareBases(const CXXRecordDecl *Class) { 6203 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6204 } 6205 }; 6206 6207 UserData Data; 6208 6209 // Returns false if we find a dependent base. 6210 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6211 return false; 6212 6213 // Returns false if the class has a dependent base or if it or one 6214 // of its bases is present in the base set of the current context. 6215 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6216 return false; 6217 6218 Diag(SS.getRange().getBegin(), 6219 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6220 << (NestedNameSpecifier*) SS.getScopeRep() 6221 << cast<CXXRecordDecl>(CurContext) 6222 << SS.getRange(); 6223 6224 return true; 6225} 6226 6227Decl *Sema::ActOnAliasDeclaration(Scope *S, 6228 AccessSpecifier AS, 6229 MultiTemplateParamsArg TemplateParamLists, 6230 SourceLocation UsingLoc, 6231 UnqualifiedId &Name, 6232 TypeResult Type) { 6233 // Skip up to the relevant declaration scope. 6234 while (S->getFlags() & Scope::TemplateParamScope) 6235 S = S->getParent(); 6236 assert((S->getFlags() & Scope::DeclScope) && 6237 "got alias-declaration outside of declaration scope"); 6238 6239 if (Type.isInvalid()) 6240 return 0; 6241 6242 bool Invalid = false; 6243 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6244 TypeSourceInfo *TInfo = 0; 6245 GetTypeFromParser(Type.get(), &TInfo); 6246 6247 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6248 return 0; 6249 6250 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6251 UPPC_DeclarationType)) { 6252 Invalid = true; 6253 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6254 TInfo->getTypeLoc().getBeginLoc()); 6255 } 6256 6257 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6258 LookupName(Previous, S); 6259 6260 // Warn about shadowing the name of a template parameter. 6261 if (Previous.isSingleResult() && 6262 Previous.getFoundDecl()->isTemplateParameter()) { 6263 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6264 Previous.getFoundDecl())) 6265 Invalid = true; 6266 Previous.clear(); 6267 } 6268 6269 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6270 "name in alias declaration must be an identifier"); 6271 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6272 Name.StartLocation, 6273 Name.Identifier, TInfo); 6274 6275 NewTD->setAccess(AS); 6276 6277 if (Invalid) 6278 NewTD->setInvalidDecl(); 6279 6280 CheckTypedefForVariablyModifiedType(S, NewTD); 6281 Invalid |= NewTD->isInvalidDecl(); 6282 6283 bool Redeclaration = false; 6284 6285 NamedDecl *NewND; 6286 if (TemplateParamLists.size()) { 6287 TypeAliasTemplateDecl *OldDecl = 0; 6288 TemplateParameterList *OldTemplateParams = 0; 6289 6290 if (TemplateParamLists.size() != 1) { 6291 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6292 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6293 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6294 } 6295 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6296 6297 // Only consider previous declarations in the same scope. 6298 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6299 /*ExplicitInstantiationOrSpecialization*/false); 6300 if (!Previous.empty()) { 6301 Redeclaration = true; 6302 6303 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6304 if (!OldDecl && !Invalid) { 6305 Diag(UsingLoc, diag::err_redefinition_different_kind) 6306 << Name.Identifier; 6307 6308 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6309 if (OldD->getLocation().isValid()) 6310 Diag(OldD->getLocation(), diag::note_previous_definition); 6311 6312 Invalid = true; 6313 } 6314 6315 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6316 if (TemplateParameterListsAreEqual(TemplateParams, 6317 OldDecl->getTemplateParameters(), 6318 /*Complain=*/true, 6319 TPL_TemplateMatch)) 6320 OldTemplateParams = OldDecl->getTemplateParameters(); 6321 else 6322 Invalid = true; 6323 6324 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6325 if (!Invalid && 6326 !Context.hasSameType(OldTD->getUnderlyingType(), 6327 NewTD->getUnderlyingType())) { 6328 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6329 // but we can't reasonably accept it. 6330 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6331 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6332 if (OldTD->getLocation().isValid()) 6333 Diag(OldTD->getLocation(), diag::note_previous_definition); 6334 Invalid = true; 6335 } 6336 } 6337 } 6338 6339 // Merge any previous default template arguments into our parameters, 6340 // and check the parameter list. 6341 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6342 TPC_TypeAliasTemplate)) 6343 return 0; 6344 6345 TypeAliasTemplateDecl *NewDecl = 6346 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6347 Name.Identifier, TemplateParams, 6348 NewTD); 6349 6350 NewDecl->setAccess(AS); 6351 6352 if (Invalid) 6353 NewDecl->setInvalidDecl(); 6354 else if (OldDecl) 6355 NewDecl->setPreviousDeclaration(OldDecl); 6356 6357 NewND = NewDecl; 6358 } else { 6359 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6360 NewND = NewTD; 6361 } 6362 6363 if (!Redeclaration) 6364 PushOnScopeChains(NewND, S); 6365 6366 return NewND; 6367} 6368 6369Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6370 SourceLocation NamespaceLoc, 6371 SourceLocation AliasLoc, 6372 IdentifierInfo *Alias, 6373 CXXScopeSpec &SS, 6374 SourceLocation IdentLoc, 6375 IdentifierInfo *Ident) { 6376 6377 // Lookup the namespace name. 6378 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6379 LookupParsedName(R, S, &SS); 6380 6381 // Check if we have a previous declaration with the same name. 6382 NamedDecl *PrevDecl 6383 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6384 ForRedeclaration); 6385 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6386 PrevDecl = 0; 6387 6388 if (PrevDecl) { 6389 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6390 // We already have an alias with the same name that points to the same 6391 // namespace, so don't create a new one. 6392 // FIXME: At some point, we'll want to create the (redundant) 6393 // declaration to maintain better source information. 6394 if (!R.isAmbiguous() && !R.empty() && 6395 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6396 return 0; 6397 } 6398 6399 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6400 diag::err_redefinition_different_kind; 6401 Diag(AliasLoc, DiagID) << Alias; 6402 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6403 return 0; 6404 } 6405 6406 if (R.isAmbiguous()) 6407 return 0; 6408 6409 if (R.empty()) { 6410 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6411 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6412 return 0; 6413 } 6414 } 6415 6416 NamespaceAliasDecl *AliasDecl = 6417 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6418 Alias, SS.getWithLocInContext(Context), 6419 IdentLoc, R.getFoundDecl()); 6420 6421 PushOnScopeChains(AliasDecl, S); 6422 return AliasDecl; 6423} 6424 6425namespace { 6426 /// \brief Scoped object used to handle the state changes required in Sema 6427 /// to implicitly define the body of a C++ member function; 6428 class ImplicitlyDefinedFunctionScope { 6429 Sema &S; 6430 Sema::ContextRAII SavedContext; 6431 6432 public: 6433 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6434 : S(S), SavedContext(S, Method) 6435 { 6436 S.PushFunctionScope(); 6437 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6438 } 6439 6440 ~ImplicitlyDefinedFunctionScope() { 6441 S.PopExpressionEvaluationContext(); 6442 S.PopFunctionOrBlockScope(); 6443 } 6444 }; 6445} 6446 6447Sema::ImplicitExceptionSpecification 6448Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6449 // C++ [except.spec]p14: 6450 // An implicitly declared special member function (Clause 12) shall have an 6451 // exception-specification. [...] 6452 ImplicitExceptionSpecification ExceptSpec(Context); 6453 if (ClassDecl->isInvalidDecl()) 6454 return ExceptSpec; 6455 6456 // Direct base-class constructors. 6457 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6458 BEnd = ClassDecl->bases_end(); 6459 B != BEnd; ++B) { 6460 if (B->isVirtual()) // Handled below. 6461 continue; 6462 6463 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6464 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6465 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6466 // If this is a deleted function, add it anyway. This might be conformant 6467 // with the standard. This might not. I'm not sure. It might not matter. 6468 if (Constructor) 6469 ExceptSpec.CalledDecl(Constructor); 6470 } 6471 } 6472 6473 // Virtual base-class constructors. 6474 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6475 BEnd = ClassDecl->vbases_end(); 6476 B != BEnd; ++B) { 6477 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6478 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6479 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6480 // If this is a deleted function, add it anyway. This might be conformant 6481 // with the standard. This might not. I'm not sure. It might not matter. 6482 if (Constructor) 6483 ExceptSpec.CalledDecl(Constructor); 6484 } 6485 } 6486 6487 // Field constructors. 6488 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6489 FEnd = ClassDecl->field_end(); 6490 F != FEnd; ++F) { 6491 if (F->hasInClassInitializer()) { 6492 if (Expr *E = F->getInClassInitializer()) 6493 ExceptSpec.CalledExpr(E); 6494 else if (!F->isInvalidDecl()) 6495 ExceptSpec.SetDelayed(); 6496 } else if (const RecordType *RecordTy 6497 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6498 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6499 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6500 // If this is a deleted function, add it anyway. This might be conformant 6501 // with the standard. This might not. I'm not sure. It might not matter. 6502 // In particular, the problem is that this function never gets called. It 6503 // might just be ill-formed because this function attempts to refer to 6504 // a deleted function here. 6505 if (Constructor) 6506 ExceptSpec.CalledDecl(Constructor); 6507 } 6508 } 6509 6510 return ExceptSpec; 6511} 6512 6513CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6514 CXXRecordDecl *ClassDecl) { 6515 // C++ [class.ctor]p5: 6516 // A default constructor for a class X is a constructor of class X 6517 // that can be called without an argument. If there is no 6518 // user-declared constructor for class X, a default constructor is 6519 // implicitly declared. An implicitly-declared default constructor 6520 // is an inline public member of its class. 6521 assert(!ClassDecl->hasUserDeclaredConstructor() && 6522 "Should not build implicit default constructor!"); 6523 6524 ImplicitExceptionSpecification Spec = 6525 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6526 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6527 6528 // Create the actual constructor declaration. 6529 CanQualType ClassType 6530 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6531 SourceLocation ClassLoc = ClassDecl->getLocation(); 6532 DeclarationName Name 6533 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6534 DeclarationNameInfo NameInfo(Name, ClassLoc); 6535 CXXConstructorDecl *DefaultCon 6536 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6537 Context.getFunctionType(Context.VoidTy, 6538 0, 0, EPI), 6539 /*TInfo=*/0, 6540 /*isExplicit=*/false, 6541 /*isInline=*/true, 6542 /*isImplicitlyDeclared=*/true, 6543 // FIXME: apply the rules for definitions here 6544 /*isConstexpr=*/false); 6545 DefaultCon->setAccess(AS_public); 6546 DefaultCon->setDefaulted(); 6547 DefaultCon->setImplicit(); 6548 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6549 6550 // Note that we have declared this constructor. 6551 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6552 6553 if (Scope *S = getScopeForContext(ClassDecl)) 6554 PushOnScopeChains(DefaultCon, S, false); 6555 ClassDecl->addDecl(DefaultCon); 6556 6557 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6558 DefaultCon->setDeletedAsWritten(); 6559 6560 return DefaultCon; 6561} 6562 6563void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6564 CXXConstructorDecl *Constructor) { 6565 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6566 !Constructor->doesThisDeclarationHaveABody() && 6567 !Constructor->isDeleted()) && 6568 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6569 6570 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6571 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6572 6573 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6574 DiagnosticErrorTrap Trap(Diags); 6575 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6576 Trap.hasErrorOccurred()) { 6577 Diag(CurrentLocation, diag::note_member_synthesized_at) 6578 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6579 Constructor->setInvalidDecl(); 6580 return; 6581 } 6582 6583 SourceLocation Loc = Constructor->getLocation(); 6584 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6585 6586 Constructor->setUsed(); 6587 MarkVTableUsed(CurrentLocation, ClassDecl); 6588 6589 if (ASTMutationListener *L = getASTMutationListener()) { 6590 L->CompletedImplicitDefinition(Constructor); 6591 } 6592} 6593 6594/// Get any existing defaulted default constructor for the given class. Do not 6595/// implicitly define one if it does not exist. 6596static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6597 CXXRecordDecl *D) { 6598 ASTContext &Context = Self.Context; 6599 QualType ClassType = Context.getTypeDeclType(D); 6600 DeclarationName ConstructorName 6601 = Context.DeclarationNames.getCXXConstructorName( 6602 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6603 6604 DeclContext::lookup_const_iterator Con, ConEnd; 6605 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6606 Con != ConEnd; ++Con) { 6607 // A function template cannot be defaulted. 6608 if (isa<FunctionTemplateDecl>(*Con)) 6609 continue; 6610 6611 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6612 if (Constructor->isDefaultConstructor()) 6613 return Constructor->isDefaulted() ? Constructor : 0; 6614 } 6615 return 0; 6616} 6617 6618void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6619 if (!D) return; 6620 AdjustDeclIfTemplate(D); 6621 6622 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6623 CXXConstructorDecl *CtorDecl 6624 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6625 6626 if (!CtorDecl) return; 6627 6628 // Compute the exception specification for the default constructor. 6629 const FunctionProtoType *CtorTy = 6630 CtorDecl->getType()->castAs<FunctionProtoType>(); 6631 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6632 ImplicitExceptionSpecification Spec = 6633 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6634 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6635 assert(EPI.ExceptionSpecType != EST_Delayed); 6636 6637 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6638 } 6639 6640 // If the default constructor is explicitly defaulted, checking the exception 6641 // specification is deferred until now. 6642 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6643 !ClassDecl->isDependentType()) 6644 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6645} 6646 6647void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6648 // We start with an initial pass over the base classes to collect those that 6649 // inherit constructors from. If there are none, we can forgo all further 6650 // processing. 6651 typedef SmallVector<const RecordType *, 4> BasesVector; 6652 BasesVector BasesToInheritFrom; 6653 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6654 BaseE = ClassDecl->bases_end(); 6655 BaseIt != BaseE; ++BaseIt) { 6656 if (BaseIt->getInheritConstructors()) { 6657 QualType Base = BaseIt->getType(); 6658 if (Base->isDependentType()) { 6659 // If we inherit constructors from anything that is dependent, just 6660 // abort processing altogether. We'll get another chance for the 6661 // instantiations. 6662 return; 6663 } 6664 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6665 } 6666 } 6667 if (BasesToInheritFrom.empty()) 6668 return; 6669 6670 // Now collect the constructors that we already have in the current class. 6671 // Those take precedence over inherited constructors. 6672 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6673 // unless there is a user-declared constructor with the same signature in 6674 // the class where the using-declaration appears. 6675 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6676 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6677 CtorE = ClassDecl->ctor_end(); 6678 CtorIt != CtorE; ++CtorIt) { 6679 ExistingConstructors.insert( 6680 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6681 } 6682 6683 Scope *S = getScopeForContext(ClassDecl); 6684 DeclarationName CreatedCtorName = 6685 Context.DeclarationNames.getCXXConstructorName( 6686 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6687 6688 // Now comes the true work. 6689 // First, we keep a map from constructor types to the base that introduced 6690 // them. Needed for finding conflicting constructors. We also keep the 6691 // actually inserted declarations in there, for pretty diagnostics. 6692 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6693 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6694 ConstructorToSourceMap InheritedConstructors; 6695 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6696 BaseE = BasesToInheritFrom.end(); 6697 BaseIt != BaseE; ++BaseIt) { 6698 const RecordType *Base = *BaseIt; 6699 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6700 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6701 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6702 CtorE = BaseDecl->ctor_end(); 6703 CtorIt != CtorE; ++CtorIt) { 6704 // Find the using declaration for inheriting this base's constructors. 6705 DeclarationName Name = 6706 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6707 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6708 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6709 SourceLocation UsingLoc = UD ? UD->getLocation() : 6710 ClassDecl->getLocation(); 6711 6712 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6713 // from the class X named in the using-declaration consists of actual 6714 // constructors and notional constructors that result from the 6715 // transformation of defaulted parameters as follows: 6716 // - all non-template default constructors of X, and 6717 // - for each non-template constructor of X that has at least one 6718 // parameter with a default argument, the set of constructors that 6719 // results from omitting any ellipsis parameter specification and 6720 // successively omitting parameters with a default argument from the 6721 // end of the parameter-type-list. 6722 CXXConstructorDecl *BaseCtor = *CtorIt; 6723 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6724 const FunctionProtoType *BaseCtorType = 6725 BaseCtor->getType()->getAs<FunctionProtoType>(); 6726 6727 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6728 maxParams = BaseCtor->getNumParams(); 6729 params <= maxParams; ++params) { 6730 // Skip default constructors. They're never inherited. 6731 if (params == 0) 6732 continue; 6733 // Skip copy and move constructors for the same reason. 6734 if (CanBeCopyOrMove && params == 1) 6735 continue; 6736 6737 // Build up a function type for this particular constructor. 6738 // FIXME: The working paper does not consider that the exception spec 6739 // for the inheriting constructor might be larger than that of the 6740 // source. This code doesn't yet, either. When it does, this code will 6741 // need to be delayed until after exception specifications and in-class 6742 // member initializers are attached. 6743 const Type *NewCtorType; 6744 if (params == maxParams) 6745 NewCtorType = BaseCtorType; 6746 else { 6747 SmallVector<QualType, 16> Args; 6748 for (unsigned i = 0; i < params; ++i) { 6749 Args.push_back(BaseCtorType->getArgType(i)); 6750 } 6751 FunctionProtoType::ExtProtoInfo ExtInfo = 6752 BaseCtorType->getExtProtoInfo(); 6753 ExtInfo.Variadic = false; 6754 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6755 Args.data(), params, ExtInfo) 6756 .getTypePtr(); 6757 } 6758 const Type *CanonicalNewCtorType = 6759 Context.getCanonicalType(NewCtorType); 6760 6761 // Now that we have the type, first check if the class already has a 6762 // constructor with this signature. 6763 if (ExistingConstructors.count(CanonicalNewCtorType)) 6764 continue; 6765 6766 // Then we check if we have already declared an inherited constructor 6767 // with this signature. 6768 std::pair<ConstructorToSourceMap::iterator, bool> result = 6769 InheritedConstructors.insert(std::make_pair( 6770 CanonicalNewCtorType, 6771 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6772 if (!result.second) { 6773 // Already in the map. If it came from a different class, that's an 6774 // error. Not if it's from the same. 6775 CanQualType PreviousBase = result.first->second.first; 6776 if (CanonicalBase != PreviousBase) { 6777 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6778 const CXXConstructorDecl *PrevBaseCtor = 6779 PrevCtor->getInheritedConstructor(); 6780 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6781 6782 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6783 Diag(BaseCtor->getLocation(), 6784 diag::note_using_decl_constructor_conflict_current_ctor); 6785 Diag(PrevBaseCtor->getLocation(), 6786 diag::note_using_decl_constructor_conflict_previous_ctor); 6787 Diag(PrevCtor->getLocation(), 6788 diag::note_using_decl_constructor_conflict_previous_using); 6789 } 6790 continue; 6791 } 6792 6793 // OK, we're there, now add the constructor. 6794 // C++0x [class.inhctor]p8: [...] that would be performed by a 6795 // user-written inline constructor [...] 6796 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6797 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6798 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6799 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6800 /*ImplicitlyDeclared=*/true, 6801 // FIXME: Due to a defect in the standard, we treat inherited 6802 // constructors as constexpr even if that makes them ill-formed. 6803 /*Constexpr=*/BaseCtor->isConstexpr()); 6804 NewCtor->setAccess(BaseCtor->getAccess()); 6805 6806 // Build up the parameter decls and add them. 6807 SmallVector<ParmVarDecl *, 16> ParamDecls; 6808 for (unsigned i = 0; i < params; ++i) { 6809 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6810 UsingLoc, UsingLoc, 6811 /*IdentifierInfo=*/0, 6812 BaseCtorType->getArgType(i), 6813 /*TInfo=*/0, SC_None, 6814 SC_None, /*DefaultArg=*/0)); 6815 } 6816 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6817 NewCtor->setInheritedConstructor(BaseCtor); 6818 6819 PushOnScopeChains(NewCtor, S, false); 6820 ClassDecl->addDecl(NewCtor); 6821 result.first->second.second = NewCtor; 6822 } 6823 } 6824 } 6825} 6826 6827Sema::ImplicitExceptionSpecification 6828Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6829 // C++ [except.spec]p14: 6830 // An implicitly declared special member function (Clause 12) shall have 6831 // an exception-specification. 6832 ImplicitExceptionSpecification ExceptSpec(Context); 6833 if (ClassDecl->isInvalidDecl()) 6834 return ExceptSpec; 6835 6836 // Direct base-class destructors. 6837 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6838 BEnd = ClassDecl->bases_end(); 6839 B != BEnd; ++B) { 6840 if (B->isVirtual()) // Handled below. 6841 continue; 6842 6843 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6844 ExceptSpec.CalledDecl( 6845 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6846 } 6847 6848 // Virtual base-class destructors. 6849 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6850 BEnd = ClassDecl->vbases_end(); 6851 B != BEnd; ++B) { 6852 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6853 ExceptSpec.CalledDecl( 6854 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6855 } 6856 6857 // Field destructors. 6858 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6859 FEnd = ClassDecl->field_end(); 6860 F != FEnd; ++F) { 6861 if (const RecordType *RecordTy 6862 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6863 ExceptSpec.CalledDecl( 6864 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6865 } 6866 6867 return ExceptSpec; 6868} 6869 6870CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6871 // C++ [class.dtor]p2: 6872 // If a class has no user-declared destructor, a destructor is 6873 // declared implicitly. An implicitly-declared destructor is an 6874 // inline public member of its class. 6875 6876 ImplicitExceptionSpecification Spec = 6877 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6878 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6879 6880 // Create the actual destructor declaration. 6881 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6882 6883 CanQualType ClassType 6884 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6885 SourceLocation ClassLoc = ClassDecl->getLocation(); 6886 DeclarationName Name 6887 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6888 DeclarationNameInfo NameInfo(Name, ClassLoc); 6889 CXXDestructorDecl *Destructor 6890 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6891 /*isInline=*/true, 6892 /*isImplicitlyDeclared=*/true); 6893 Destructor->setAccess(AS_public); 6894 Destructor->setDefaulted(); 6895 Destructor->setImplicit(); 6896 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6897 6898 // Note that we have declared this destructor. 6899 ++ASTContext::NumImplicitDestructorsDeclared; 6900 6901 // Introduce this destructor into its scope. 6902 if (Scope *S = getScopeForContext(ClassDecl)) 6903 PushOnScopeChains(Destructor, S, false); 6904 ClassDecl->addDecl(Destructor); 6905 6906 // This could be uniqued if it ever proves significant. 6907 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6908 6909 if (ShouldDeleteDestructor(Destructor)) 6910 Destructor->setDeletedAsWritten(); 6911 6912 AddOverriddenMethods(ClassDecl, Destructor); 6913 6914 return Destructor; 6915} 6916 6917void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6918 CXXDestructorDecl *Destructor) { 6919 assert((Destructor->isDefaulted() && 6920 !Destructor->doesThisDeclarationHaveABody()) && 6921 "DefineImplicitDestructor - call it for implicit default dtor"); 6922 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6923 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6924 6925 if (Destructor->isInvalidDecl()) 6926 return; 6927 6928 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6929 6930 DiagnosticErrorTrap Trap(Diags); 6931 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6932 Destructor->getParent()); 6933 6934 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6935 Diag(CurrentLocation, diag::note_member_synthesized_at) 6936 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6937 6938 Destructor->setInvalidDecl(); 6939 return; 6940 } 6941 6942 SourceLocation Loc = Destructor->getLocation(); 6943 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6944 6945 Destructor->setUsed(); 6946 MarkVTableUsed(CurrentLocation, ClassDecl); 6947 6948 if (ASTMutationListener *L = getASTMutationListener()) { 6949 L->CompletedImplicitDefinition(Destructor); 6950 } 6951} 6952 6953void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6954 CXXDestructorDecl *destructor) { 6955 // C++11 [class.dtor]p3: 6956 // A declaration of a destructor that does not have an exception- 6957 // specification is implicitly considered to have the same exception- 6958 // specification as an implicit declaration. 6959 const FunctionProtoType *dtorType = destructor->getType()-> 6960 getAs<FunctionProtoType>(); 6961 if (dtorType->hasExceptionSpec()) 6962 return; 6963 6964 ImplicitExceptionSpecification exceptSpec = 6965 ComputeDefaultedDtorExceptionSpec(classDecl); 6966 6967 // Replace the destructor's type, building off the existing one. Fortunately, 6968 // the only thing of interest in the destructor type is its extended info. 6969 // The return and arguments are fixed. 6970 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 6971 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6972 epi.NumExceptions = exceptSpec.size(); 6973 epi.Exceptions = exceptSpec.data(); 6974 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6975 6976 destructor->setType(ty); 6977 6978 // FIXME: If the destructor has a body that could throw, and the newly created 6979 // spec doesn't allow exceptions, we should emit a warning, because this 6980 // change in behavior can break conforming C++03 programs at runtime. 6981 // However, we don't have a body yet, so it needs to be done somewhere else. 6982} 6983 6984/// \brief Builds a statement that copies/moves the given entity from \p From to 6985/// \c To. 6986/// 6987/// This routine is used to copy/move the members of a class with an 6988/// implicitly-declared copy/move assignment operator. When the entities being 6989/// copied are arrays, this routine builds for loops to copy them. 6990/// 6991/// \param S The Sema object used for type-checking. 6992/// 6993/// \param Loc The location where the implicit copy/move is being generated. 6994/// 6995/// \param T The type of the expressions being copied/moved. Both expressions 6996/// must have this type. 6997/// 6998/// \param To The expression we are copying/moving to. 6999/// 7000/// \param From The expression we are copying/moving from. 7001/// 7002/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7003/// Otherwise, it's a non-static member subobject. 7004/// 7005/// \param Copying Whether we're copying or moving. 7006/// 7007/// \param Depth Internal parameter recording the depth of the recursion. 7008/// 7009/// \returns A statement or a loop that copies the expressions. 7010static StmtResult 7011BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7012 Expr *To, Expr *From, 7013 bool CopyingBaseSubobject, bool Copying, 7014 unsigned Depth = 0) { 7015 // C++0x [class.copy]p28: 7016 // Each subobject is assigned in the manner appropriate to its type: 7017 // 7018 // - if the subobject is of class type, as if by a call to operator= with 7019 // the subobject as the object expression and the corresponding 7020 // subobject of x as a single function argument (as if by explicit 7021 // qualification; that is, ignoring any possible virtual overriding 7022 // functions in more derived classes); 7023 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7024 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7025 7026 // Look for operator=. 7027 DeclarationName Name 7028 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7029 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7030 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7031 7032 // Filter out any result that isn't a copy/move-assignment operator. 7033 LookupResult::Filter F = OpLookup.makeFilter(); 7034 while (F.hasNext()) { 7035 NamedDecl *D = F.next(); 7036 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7037 if (Copying ? Method->isCopyAssignmentOperator() : 7038 Method->isMoveAssignmentOperator()) 7039 continue; 7040 7041 F.erase(); 7042 } 7043 F.done(); 7044 7045 // Suppress the protected check (C++ [class.protected]) for each of the 7046 // assignment operators we found. This strange dance is required when 7047 // we're assigning via a base classes's copy-assignment operator. To 7048 // ensure that we're getting the right base class subobject (without 7049 // ambiguities), we need to cast "this" to that subobject type; to 7050 // ensure that we don't go through the virtual call mechanism, we need 7051 // to qualify the operator= name with the base class (see below). However, 7052 // this means that if the base class has a protected copy assignment 7053 // operator, the protected member access check will fail. So, we 7054 // rewrite "protected" access to "public" access in this case, since we 7055 // know by construction that we're calling from a derived class. 7056 if (CopyingBaseSubobject) { 7057 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7058 L != LEnd; ++L) { 7059 if (L.getAccess() == AS_protected) 7060 L.setAccess(AS_public); 7061 } 7062 } 7063 7064 // Create the nested-name-specifier that will be used to qualify the 7065 // reference to operator=; this is required to suppress the virtual 7066 // call mechanism. 7067 CXXScopeSpec SS; 7068 SS.MakeTrivial(S.Context, 7069 NestedNameSpecifier::Create(S.Context, 0, false, 7070 T.getTypePtr()), 7071 Loc); 7072 7073 // Create the reference to operator=. 7074 ExprResult OpEqualRef 7075 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7076 /*FirstQualifierInScope=*/0, OpLookup, 7077 /*TemplateArgs=*/0, 7078 /*SuppressQualifierCheck=*/true); 7079 if (OpEqualRef.isInvalid()) 7080 return StmtError(); 7081 7082 // Build the call to the assignment operator. 7083 7084 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7085 OpEqualRef.takeAs<Expr>(), 7086 Loc, &From, 1, Loc); 7087 if (Call.isInvalid()) 7088 return StmtError(); 7089 7090 return S.Owned(Call.takeAs<Stmt>()); 7091 } 7092 7093 // - if the subobject is of scalar type, the built-in assignment 7094 // operator is used. 7095 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7096 if (!ArrayTy) { 7097 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7098 if (Assignment.isInvalid()) 7099 return StmtError(); 7100 7101 return S.Owned(Assignment.takeAs<Stmt>()); 7102 } 7103 7104 // - if the subobject is an array, each element is assigned, in the 7105 // manner appropriate to the element type; 7106 7107 // Construct a loop over the array bounds, e.g., 7108 // 7109 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7110 // 7111 // that will copy each of the array elements. 7112 QualType SizeType = S.Context.getSizeType(); 7113 7114 // Create the iteration variable. 7115 IdentifierInfo *IterationVarName = 0; 7116 { 7117 llvm::SmallString<8> Str; 7118 llvm::raw_svector_ostream OS(Str); 7119 OS << "__i" << Depth; 7120 IterationVarName = &S.Context.Idents.get(OS.str()); 7121 } 7122 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7123 IterationVarName, SizeType, 7124 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7125 SC_None, SC_None); 7126 7127 // Initialize the iteration variable to zero. 7128 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7129 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7130 7131 // Create a reference to the iteration variable; we'll use this several 7132 // times throughout. 7133 Expr *IterationVarRef 7134 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7135 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7136 7137 // Create the DeclStmt that holds the iteration variable. 7138 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7139 7140 // Create the comparison against the array bound. 7141 llvm::APInt Upper 7142 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7143 Expr *Comparison 7144 = new (S.Context) BinaryOperator(IterationVarRef, 7145 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7146 BO_NE, S.Context.BoolTy, 7147 VK_RValue, OK_Ordinary, Loc); 7148 7149 // Create the pre-increment of the iteration variable. 7150 Expr *Increment 7151 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7152 VK_LValue, OK_Ordinary, Loc); 7153 7154 // Subscript the "from" and "to" expressions with the iteration variable. 7155 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7156 IterationVarRef, Loc)); 7157 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7158 IterationVarRef, Loc)); 7159 if (!Copying) // Cast to rvalue 7160 From = CastForMoving(S, From); 7161 7162 // Build the copy/move for an individual element of the array. 7163 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7164 To, From, CopyingBaseSubobject, 7165 Copying, Depth + 1); 7166 if (Copy.isInvalid()) 7167 return StmtError(); 7168 7169 // Construct the loop that copies all elements of this array. 7170 return S.ActOnForStmt(Loc, Loc, InitStmt, 7171 S.MakeFullExpr(Comparison), 7172 0, S.MakeFullExpr(Increment), 7173 Loc, Copy.take()); 7174} 7175 7176std::pair<Sema::ImplicitExceptionSpecification, bool> 7177Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7178 CXXRecordDecl *ClassDecl) { 7179 if (ClassDecl->isInvalidDecl()) 7180 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7181 7182 // C++ [class.copy]p10: 7183 // If the class definition does not explicitly declare a copy 7184 // assignment operator, one is declared implicitly. 7185 // The implicitly-defined copy assignment operator for a class X 7186 // will have the form 7187 // 7188 // X& X::operator=(const X&) 7189 // 7190 // if 7191 bool HasConstCopyAssignment = true; 7192 7193 // -- each direct base class B of X has a copy assignment operator 7194 // whose parameter is of type const B&, const volatile B& or B, 7195 // and 7196 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7197 BaseEnd = ClassDecl->bases_end(); 7198 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7199 // We'll handle this below 7200 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7201 continue; 7202 7203 assert(!Base->getType()->isDependentType() && 7204 "Cannot generate implicit members for class with dependent bases."); 7205 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7206 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7207 &HasConstCopyAssignment); 7208 } 7209 7210 // In C++0x, the above citation has "or virtual added" 7211 if (LangOpts.CPlusPlus0x) { 7212 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7213 BaseEnd = ClassDecl->vbases_end(); 7214 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7215 assert(!Base->getType()->isDependentType() && 7216 "Cannot generate implicit members for class with dependent bases."); 7217 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7218 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7219 &HasConstCopyAssignment); 7220 } 7221 } 7222 7223 // -- for all the nonstatic data members of X that are of a class 7224 // type M (or array thereof), each such class type has a copy 7225 // assignment operator whose parameter is of type const M&, 7226 // const volatile M& or M. 7227 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7228 FieldEnd = ClassDecl->field_end(); 7229 HasConstCopyAssignment && Field != FieldEnd; 7230 ++Field) { 7231 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7232 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7233 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7234 &HasConstCopyAssignment); 7235 } 7236 } 7237 7238 // Otherwise, the implicitly declared copy assignment operator will 7239 // have the form 7240 // 7241 // X& X::operator=(X&) 7242 7243 // C++ [except.spec]p14: 7244 // An implicitly declared special member function (Clause 12) shall have an 7245 // exception-specification. [...] 7246 7247 // It is unspecified whether or not an implicit copy assignment operator 7248 // attempts to deduplicate calls to assignment operators of virtual bases are 7249 // made. As such, this exception specification is effectively unspecified. 7250 // Based on a similar decision made for constness in C++0x, we're erring on 7251 // the side of assuming such calls to be made regardless of whether they 7252 // actually happen. 7253 ImplicitExceptionSpecification ExceptSpec(Context); 7254 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7255 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7256 BaseEnd = ClassDecl->bases_end(); 7257 Base != BaseEnd; ++Base) { 7258 if (Base->isVirtual()) 7259 continue; 7260 7261 CXXRecordDecl *BaseClassDecl 7262 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7263 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7264 ArgQuals, false, 0)) 7265 ExceptSpec.CalledDecl(CopyAssign); 7266 } 7267 7268 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7269 BaseEnd = ClassDecl->vbases_end(); 7270 Base != BaseEnd; ++Base) { 7271 CXXRecordDecl *BaseClassDecl 7272 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7273 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7274 ArgQuals, false, 0)) 7275 ExceptSpec.CalledDecl(CopyAssign); 7276 } 7277 7278 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7279 FieldEnd = ClassDecl->field_end(); 7280 Field != FieldEnd; 7281 ++Field) { 7282 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7283 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7284 if (CXXMethodDecl *CopyAssign = 7285 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7286 ExceptSpec.CalledDecl(CopyAssign); 7287 } 7288 } 7289 7290 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7291} 7292 7293CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7294 // Note: The following rules are largely analoguous to the copy 7295 // constructor rules. Note that virtual bases are not taken into account 7296 // for determining the argument type of the operator. Note also that 7297 // operators taking an object instead of a reference are allowed. 7298 7299 ImplicitExceptionSpecification Spec(Context); 7300 bool Const; 7301 llvm::tie(Spec, Const) = 7302 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7303 7304 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7305 QualType RetType = Context.getLValueReferenceType(ArgType); 7306 if (Const) 7307 ArgType = ArgType.withConst(); 7308 ArgType = Context.getLValueReferenceType(ArgType); 7309 7310 // An implicitly-declared copy assignment operator is an inline public 7311 // member of its class. 7312 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7313 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7314 SourceLocation ClassLoc = ClassDecl->getLocation(); 7315 DeclarationNameInfo NameInfo(Name, ClassLoc); 7316 CXXMethodDecl *CopyAssignment 7317 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7318 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7319 /*TInfo=*/0, /*isStatic=*/false, 7320 /*StorageClassAsWritten=*/SC_None, 7321 /*isInline=*/true, /*isConstexpr=*/false, 7322 SourceLocation()); 7323 CopyAssignment->setAccess(AS_public); 7324 CopyAssignment->setDefaulted(); 7325 CopyAssignment->setImplicit(); 7326 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7327 7328 // Add the parameter to the operator. 7329 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7330 ClassLoc, ClassLoc, /*Id=*/0, 7331 ArgType, /*TInfo=*/0, 7332 SC_None, 7333 SC_None, 0); 7334 CopyAssignment->setParams(&FromParam, 1); 7335 7336 // Note that we have added this copy-assignment operator. 7337 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7338 7339 if (Scope *S = getScopeForContext(ClassDecl)) 7340 PushOnScopeChains(CopyAssignment, S, false); 7341 ClassDecl->addDecl(CopyAssignment); 7342 7343 // C++0x [class.copy]p18: 7344 // ... If the class definition declares a move constructor or move 7345 // assignment operator, the implicitly declared copy assignment operator is 7346 // defined as deleted; ... 7347 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7348 ClassDecl->hasUserDeclaredMoveAssignment() || 7349 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7350 CopyAssignment->setDeletedAsWritten(); 7351 7352 AddOverriddenMethods(ClassDecl, CopyAssignment); 7353 return CopyAssignment; 7354} 7355 7356void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7357 CXXMethodDecl *CopyAssignOperator) { 7358 assert((CopyAssignOperator->isDefaulted() && 7359 CopyAssignOperator->isOverloadedOperator() && 7360 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7361 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7362 "DefineImplicitCopyAssignment called for wrong function"); 7363 7364 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7365 7366 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7367 CopyAssignOperator->setInvalidDecl(); 7368 return; 7369 } 7370 7371 CopyAssignOperator->setUsed(); 7372 7373 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7374 DiagnosticErrorTrap Trap(Diags); 7375 7376 // C++0x [class.copy]p30: 7377 // The implicitly-defined or explicitly-defaulted copy assignment operator 7378 // for a non-union class X performs memberwise copy assignment of its 7379 // subobjects. The direct base classes of X are assigned first, in the 7380 // order of their declaration in the base-specifier-list, and then the 7381 // immediate non-static data members of X are assigned, in the order in 7382 // which they were declared in the class definition. 7383 7384 // The statements that form the synthesized function body. 7385 ASTOwningVector<Stmt*> Statements(*this); 7386 7387 // The parameter for the "other" object, which we are copying from. 7388 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7389 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7390 QualType OtherRefType = Other->getType(); 7391 if (const LValueReferenceType *OtherRef 7392 = OtherRefType->getAs<LValueReferenceType>()) { 7393 OtherRefType = OtherRef->getPointeeType(); 7394 OtherQuals = OtherRefType.getQualifiers(); 7395 } 7396 7397 // Our location for everything implicitly-generated. 7398 SourceLocation Loc = CopyAssignOperator->getLocation(); 7399 7400 // Construct a reference to the "other" object. We'll be using this 7401 // throughout the generated ASTs. 7402 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7403 assert(OtherRef && "Reference to parameter cannot fail!"); 7404 7405 // Construct the "this" pointer. We'll be using this throughout the generated 7406 // ASTs. 7407 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7408 assert(This && "Reference to this cannot fail!"); 7409 7410 // Assign base classes. 7411 bool Invalid = false; 7412 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7413 E = ClassDecl->bases_end(); Base != E; ++Base) { 7414 // Form the assignment: 7415 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7416 QualType BaseType = Base->getType().getUnqualifiedType(); 7417 if (!BaseType->isRecordType()) { 7418 Invalid = true; 7419 continue; 7420 } 7421 7422 CXXCastPath BasePath; 7423 BasePath.push_back(Base); 7424 7425 // Construct the "from" expression, which is an implicit cast to the 7426 // appropriately-qualified base type. 7427 Expr *From = OtherRef; 7428 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7429 CK_UncheckedDerivedToBase, 7430 VK_LValue, &BasePath).take(); 7431 7432 // Dereference "this". 7433 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7434 7435 // Implicitly cast "this" to the appropriately-qualified base type. 7436 To = ImpCastExprToType(To.take(), 7437 Context.getCVRQualifiedType(BaseType, 7438 CopyAssignOperator->getTypeQualifiers()), 7439 CK_UncheckedDerivedToBase, 7440 VK_LValue, &BasePath); 7441 7442 // Build the copy. 7443 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7444 To.get(), From, 7445 /*CopyingBaseSubobject=*/true, 7446 /*Copying=*/true); 7447 if (Copy.isInvalid()) { 7448 Diag(CurrentLocation, diag::note_member_synthesized_at) 7449 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7450 CopyAssignOperator->setInvalidDecl(); 7451 return; 7452 } 7453 7454 // Success! Record the copy. 7455 Statements.push_back(Copy.takeAs<Expr>()); 7456 } 7457 7458 // \brief Reference to the __builtin_memcpy function. 7459 Expr *BuiltinMemCpyRef = 0; 7460 // \brief Reference to the __builtin_objc_memmove_collectable function. 7461 Expr *CollectableMemCpyRef = 0; 7462 7463 // Assign non-static members. 7464 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7465 FieldEnd = ClassDecl->field_end(); 7466 Field != FieldEnd; ++Field) { 7467 // Check for members of reference type; we can't copy those. 7468 if (Field->getType()->isReferenceType()) { 7469 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7470 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7471 Diag(Field->getLocation(), diag::note_declared_at); 7472 Diag(CurrentLocation, diag::note_member_synthesized_at) 7473 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7474 Invalid = true; 7475 continue; 7476 } 7477 7478 // Check for members of const-qualified, non-class type. 7479 QualType BaseType = Context.getBaseElementType(Field->getType()); 7480 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7481 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7482 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7483 Diag(Field->getLocation(), diag::note_declared_at); 7484 Diag(CurrentLocation, diag::note_member_synthesized_at) 7485 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7486 Invalid = true; 7487 continue; 7488 } 7489 7490 // Suppress assigning zero-width bitfields. 7491 if (const Expr *Width = Field->getBitWidth()) 7492 if (Width->EvaluateAsInt(Context) == 0) 7493 continue; 7494 7495 QualType FieldType = Field->getType().getNonReferenceType(); 7496 if (FieldType->isIncompleteArrayType()) { 7497 assert(ClassDecl->hasFlexibleArrayMember() && 7498 "Incomplete array type is not valid"); 7499 continue; 7500 } 7501 7502 // Build references to the field in the object we're copying from and to. 7503 CXXScopeSpec SS; // Intentionally empty 7504 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7505 LookupMemberName); 7506 MemberLookup.addDecl(*Field); 7507 MemberLookup.resolveKind(); 7508 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7509 Loc, /*IsArrow=*/false, 7510 SS, 0, MemberLookup, 0); 7511 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7512 Loc, /*IsArrow=*/true, 7513 SS, 0, MemberLookup, 0); 7514 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7515 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7516 7517 // If the field should be copied with __builtin_memcpy rather than via 7518 // explicit assignments, do so. This optimization only applies for arrays 7519 // of scalars and arrays of class type with trivial copy-assignment 7520 // operators. 7521 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7522 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7523 // Compute the size of the memory buffer to be copied. 7524 QualType SizeType = Context.getSizeType(); 7525 llvm::APInt Size(Context.getTypeSize(SizeType), 7526 Context.getTypeSizeInChars(BaseType).getQuantity()); 7527 for (const ConstantArrayType *Array 7528 = Context.getAsConstantArrayType(FieldType); 7529 Array; 7530 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7531 llvm::APInt ArraySize 7532 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7533 Size *= ArraySize; 7534 } 7535 7536 // Take the address of the field references for "from" and "to". 7537 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7538 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7539 7540 bool NeedsCollectableMemCpy = 7541 (BaseType->isRecordType() && 7542 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7543 7544 if (NeedsCollectableMemCpy) { 7545 if (!CollectableMemCpyRef) { 7546 // Create a reference to the __builtin_objc_memmove_collectable function. 7547 LookupResult R(*this, 7548 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7549 Loc, LookupOrdinaryName); 7550 LookupName(R, TUScope, true); 7551 7552 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7553 if (!CollectableMemCpy) { 7554 // Something went horribly wrong earlier, and we will have 7555 // complained about it. 7556 Invalid = true; 7557 continue; 7558 } 7559 7560 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7561 CollectableMemCpy->getType(), 7562 VK_LValue, Loc, 0).take(); 7563 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7564 } 7565 } 7566 // Create a reference to the __builtin_memcpy builtin function. 7567 else if (!BuiltinMemCpyRef) { 7568 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7569 LookupOrdinaryName); 7570 LookupName(R, TUScope, true); 7571 7572 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7573 if (!BuiltinMemCpy) { 7574 // Something went horribly wrong earlier, and we will have complained 7575 // about it. 7576 Invalid = true; 7577 continue; 7578 } 7579 7580 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7581 BuiltinMemCpy->getType(), 7582 VK_LValue, Loc, 0).take(); 7583 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7584 } 7585 7586 ASTOwningVector<Expr*> CallArgs(*this); 7587 CallArgs.push_back(To.takeAs<Expr>()); 7588 CallArgs.push_back(From.takeAs<Expr>()); 7589 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7590 ExprResult Call = ExprError(); 7591 if (NeedsCollectableMemCpy) 7592 Call = ActOnCallExpr(/*Scope=*/0, 7593 CollectableMemCpyRef, 7594 Loc, move_arg(CallArgs), 7595 Loc); 7596 else 7597 Call = ActOnCallExpr(/*Scope=*/0, 7598 BuiltinMemCpyRef, 7599 Loc, move_arg(CallArgs), 7600 Loc); 7601 7602 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7603 Statements.push_back(Call.takeAs<Expr>()); 7604 continue; 7605 } 7606 7607 // Build the copy of this field. 7608 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7609 To.get(), From.get(), 7610 /*CopyingBaseSubobject=*/false, 7611 /*Copying=*/true); 7612 if (Copy.isInvalid()) { 7613 Diag(CurrentLocation, diag::note_member_synthesized_at) 7614 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7615 CopyAssignOperator->setInvalidDecl(); 7616 return; 7617 } 7618 7619 // Success! Record the copy. 7620 Statements.push_back(Copy.takeAs<Stmt>()); 7621 } 7622 7623 if (!Invalid) { 7624 // Add a "return *this;" 7625 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7626 7627 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7628 if (Return.isInvalid()) 7629 Invalid = true; 7630 else { 7631 Statements.push_back(Return.takeAs<Stmt>()); 7632 7633 if (Trap.hasErrorOccurred()) { 7634 Diag(CurrentLocation, diag::note_member_synthesized_at) 7635 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7636 Invalid = true; 7637 } 7638 } 7639 } 7640 7641 if (Invalid) { 7642 CopyAssignOperator->setInvalidDecl(); 7643 return; 7644 } 7645 7646 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7647 /*isStmtExpr=*/false); 7648 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7649 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7650 7651 if (ASTMutationListener *L = getASTMutationListener()) { 7652 L->CompletedImplicitDefinition(CopyAssignOperator); 7653 } 7654} 7655 7656Sema::ImplicitExceptionSpecification 7657Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7658 ImplicitExceptionSpecification ExceptSpec(Context); 7659 7660 if (ClassDecl->isInvalidDecl()) 7661 return ExceptSpec; 7662 7663 // C++0x [except.spec]p14: 7664 // An implicitly declared special member function (Clause 12) shall have an 7665 // exception-specification. [...] 7666 7667 // It is unspecified whether or not an implicit move assignment operator 7668 // attempts to deduplicate calls to assignment operators of virtual bases are 7669 // made. As such, this exception specification is effectively unspecified. 7670 // Based on a similar decision made for constness in C++0x, we're erring on 7671 // the side of assuming such calls to be made regardless of whether they 7672 // actually happen. 7673 // Note that a move constructor is not implicitly declared when there are 7674 // virtual bases, but it can still be user-declared and explicitly defaulted. 7675 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7676 BaseEnd = ClassDecl->bases_end(); 7677 Base != BaseEnd; ++Base) { 7678 if (Base->isVirtual()) 7679 continue; 7680 7681 CXXRecordDecl *BaseClassDecl 7682 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7683 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7684 false, 0)) 7685 ExceptSpec.CalledDecl(MoveAssign); 7686 } 7687 7688 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7689 BaseEnd = ClassDecl->vbases_end(); 7690 Base != BaseEnd; ++Base) { 7691 CXXRecordDecl *BaseClassDecl 7692 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7693 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7694 false, 0)) 7695 ExceptSpec.CalledDecl(MoveAssign); 7696 } 7697 7698 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7699 FieldEnd = ClassDecl->field_end(); 7700 Field != FieldEnd; 7701 ++Field) { 7702 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7703 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7704 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7705 false, 0)) 7706 ExceptSpec.CalledDecl(MoveAssign); 7707 } 7708 } 7709 7710 return ExceptSpec; 7711} 7712 7713CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7714 // Note: The following rules are largely analoguous to the move 7715 // constructor rules. 7716 7717 ImplicitExceptionSpecification Spec( 7718 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7719 7720 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7721 QualType RetType = Context.getLValueReferenceType(ArgType); 7722 ArgType = Context.getRValueReferenceType(ArgType); 7723 7724 // An implicitly-declared move assignment operator is an inline public 7725 // member of its class. 7726 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7727 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7728 SourceLocation ClassLoc = ClassDecl->getLocation(); 7729 DeclarationNameInfo NameInfo(Name, ClassLoc); 7730 CXXMethodDecl *MoveAssignment 7731 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7732 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7733 /*TInfo=*/0, /*isStatic=*/false, 7734 /*StorageClassAsWritten=*/SC_None, 7735 /*isInline=*/true, 7736 /*isConstexpr=*/false, 7737 SourceLocation()); 7738 MoveAssignment->setAccess(AS_public); 7739 MoveAssignment->setDefaulted(); 7740 MoveAssignment->setImplicit(); 7741 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7742 7743 // Add the parameter to the operator. 7744 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7745 ClassLoc, ClassLoc, /*Id=*/0, 7746 ArgType, /*TInfo=*/0, 7747 SC_None, 7748 SC_None, 0); 7749 MoveAssignment->setParams(&FromParam, 1); 7750 7751 // Note that we have added this copy-assignment operator. 7752 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7753 7754 // C++0x [class.copy]p9: 7755 // If the definition of a class X does not explicitly declare a move 7756 // assignment operator, one will be implicitly declared as defaulted if and 7757 // only if: 7758 // [...] 7759 // - the move assignment operator would not be implicitly defined as 7760 // deleted. 7761 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7762 // Cache this result so that we don't try to generate this over and over 7763 // on every lookup, leaking memory and wasting time. 7764 ClassDecl->setFailedImplicitMoveAssignment(); 7765 return 0; 7766 } 7767 7768 if (Scope *S = getScopeForContext(ClassDecl)) 7769 PushOnScopeChains(MoveAssignment, S, false); 7770 ClassDecl->addDecl(MoveAssignment); 7771 7772 AddOverriddenMethods(ClassDecl, MoveAssignment); 7773 return MoveAssignment; 7774} 7775 7776void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 7777 CXXMethodDecl *MoveAssignOperator) { 7778 assert((MoveAssignOperator->isDefaulted() && 7779 MoveAssignOperator->isOverloadedOperator() && 7780 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 7781 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 7782 "DefineImplicitMoveAssignment called for wrong function"); 7783 7784 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 7785 7786 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 7787 MoveAssignOperator->setInvalidDecl(); 7788 return; 7789 } 7790 7791 MoveAssignOperator->setUsed(); 7792 7793 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 7794 DiagnosticErrorTrap Trap(Diags); 7795 7796 // C++0x [class.copy]p28: 7797 // The implicitly-defined or move assignment operator for a non-union class 7798 // X performs memberwise move assignment of its subobjects. The direct base 7799 // classes of X are assigned first, in the order of their declaration in the 7800 // base-specifier-list, and then the immediate non-static data members of X 7801 // are assigned, in the order in which they were declared in the class 7802 // definition. 7803 7804 // The statements that form the synthesized function body. 7805 ASTOwningVector<Stmt*> Statements(*this); 7806 7807 // The parameter for the "other" object, which we are move from. 7808 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 7809 QualType OtherRefType = Other->getType()-> 7810 getAs<RValueReferenceType>()->getPointeeType(); 7811 assert(OtherRefType.getQualifiers() == 0 && 7812 "Bad argument type of defaulted move assignment"); 7813 7814 // Our location for everything implicitly-generated. 7815 SourceLocation Loc = MoveAssignOperator->getLocation(); 7816 7817 // Construct a reference to the "other" object. We'll be using this 7818 // throughout the generated ASTs. 7819 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7820 assert(OtherRef && "Reference to parameter cannot fail!"); 7821 // Cast to rvalue. 7822 OtherRef = CastForMoving(*this, OtherRef); 7823 7824 // Construct the "this" pointer. We'll be using this throughout the generated 7825 // ASTs. 7826 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7827 assert(This && "Reference to this cannot fail!"); 7828 7829 // Assign base classes. 7830 bool Invalid = false; 7831 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7832 E = ClassDecl->bases_end(); Base != E; ++Base) { 7833 // Form the assignment: 7834 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 7835 QualType BaseType = Base->getType().getUnqualifiedType(); 7836 if (!BaseType->isRecordType()) { 7837 Invalid = true; 7838 continue; 7839 } 7840 7841 CXXCastPath BasePath; 7842 BasePath.push_back(Base); 7843 7844 // Construct the "from" expression, which is an implicit cast to the 7845 // appropriately-qualified base type. 7846 Expr *From = OtherRef; 7847 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 7848 VK_XValue, &BasePath).take(); 7849 7850 // Dereference "this". 7851 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7852 7853 // Implicitly cast "this" to the appropriately-qualified base type. 7854 To = ImpCastExprToType(To.take(), 7855 Context.getCVRQualifiedType(BaseType, 7856 MoveAssignOperator->getTypeQualifiers()), 7857 CK_UncheckedDerivedToBase, 7858 VK_LValue, &BasePath); 7859 7860 // Build the move. 7861 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 7862 To.get(), From, 7863 /*CopyingBaseSubobject=*/true, 7864 /*Copying=*/false); 7865 if (Move.isInvalid()) { 7866 Diag(CurrentLocation, diag::note_member_synthesized_at) 7867 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7868 MoveAssignOperator->setInvalidDecl(); 7869 return; 7870 } 7871 7872 // Success! Record the move. 7873 Statements.push_back(Move.takeAs<Expr>()); 7874 } 7875 7876 // \brief Reference to the __builtin_memcpy function. 7877 Expr *BuiltinMemCpyRef = 0; 7878 // \brief Reference to the __builtin_objc_memmove_collectable function. 7879 Expr *CollectableMemCpyRef = 0; 7880 7881 // Assign non-static members. 7882 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7883 FieldEnd = ClassDecl->field_end(); 7884 Field != FieldEnd; ++Field) { 7885 // Check for members of reference type; we can't move those. 7886 if (Field->getType()->isReferenceType()) { 7887 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7888 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7889 Diag(Field->getLocation(), diag::note_declared_at); 7890 Diag(CurrentLocation, diag::note_member_synthesized_at) 7891 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7892 Invalid = true; 7893 continue; 7894 } 7895 7896 // Check for members of const-qualified, non-class type. 7897 QualType BaseType = Context.getBaseElementType(Field->getType()); 7898 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7899 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7900 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7901 Diag(Field->getLocation(), diag::note_declared_at); 7902 Diag(CurrentLocation, diag::note_member_synthesized_at) 7903 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7904 Invalid = true; 7905 continue; 7906 } 7907 7908 // Suppress assigning zero-width bitfields. 7909 if (const Expr *Width = Field->getBitWidth()) 7910 if (Width->EvaluateAsInt(Context) == 0) 7911 continue; 7912 7913 QualType FieldType = Field->getType().getNonReferenceType(); 7914 if (FieldType->isIncompleteArrayType()) { 7915 assert(ClassDecl->hasFlexibleArrayMember() && 7916 "Incomplete array type is not valid"); 7917 continue; 7918 } 7919 7920 // Build references to the field in the object we're copying from and to. 7921 CXXScopeSpec SS; // Intentionally empty 7922 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7923 LookupMemberName); 7924 MemberLookup.addDecl(*Field); 7925 MemberLookup.resolveKind(); 7926 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7927 Loc, /*IsArrow=*/false, 7928 SS, 0, MemberLookup, 0); 7929 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7930 Loc, /*IsArrow=*/true, 7931 SS, 0, MemberLookup, 0); 7932 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7933 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7934 7935 assert(!From.get()->isLValue() && // could be xvalue or prvalue 7936 "Member reference with rvalue base must be rvalue except for reference " 7937 "members, which aren't allowed for move assignment."); 7938 7939 // If the field should be copied with __builtin_memcpy rather than via 7940 // explicit assignments, do so. This optimization only applies for arrays 7941 // of scalars and arrays of class type with trivial move-assignment 7942 // operators. 7943 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7944 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 7945 // Compute the size of the memory buffer to be copied. 7946 QualType SizeType = Context.getSizeType(); 7947 llvm::APInt Size(Context.getTypeSize(SizeType), 7948 Context.getTypeSizeInChars(BaseType).getQuantity()); 7949 for (const ConstantArrayType *Array 7950 = Context.getAsConstantArrayType(FieldType); 7951 Array; 7952 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7953 llvm::APInt ArraySize 7954 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7955 Size *= ArraySize; 7956 } 7957 7958 // Take the address of the field references for "from" and "to". We 7959 // directly construct UnaryOperators here because semantic analysis 7960 // does not permit us to take the address of an xvalue. 7961 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 7962 Context.getPointerType(From.get()->getType()), 7963 VK_RValue, OK_Ordinary, Loc); 7964 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 7965 Context.getPointerType(To.get()->getType()), 7966 VK_RValue, OK_Ordinary, Loc); 7967 7968 bool NeedsCollectableMemCpy = 7969 (BaseType->isRecordType() && 7970 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7971 7972 if (NeedsCollectableMemCpy) { 7973 if (!CollectableMemCpyRef) { 7974 // Create a reference to the __builtin_objc_memmove_collectable function. 7975 LookupResult R(*this, 7976 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7977 Loc, LookupOrdinaryName); 7978 LookupName(R, TUScope, true); 7979 7980 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7981 if (!CollectableMemCpy) { 7982 // Something went horribly wrong earlier, and we will have 7983 // complained about it. 7984 Invalid = true; 7985 continue; 7986 } 7987 7988 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7989 CollectableMemCpy->getType(), 7990 VK_LValue, Loc, 0).take(); 7991 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7992 } 7993 } 7994 // Create a reference to the __builtin_memcpy builtin function. 7995 else if (!BuiltinMemCpyRef) { 7996 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7997 LookupOrdinaryName); 7998 LookupName(R, TUScope, true); 7999 8000 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8001 if (!BuiltinMemCpy) { 8002 // Something went horribly wrong earlier, and we will have complained 8003 // about it. 8004 Invalid = true; 8005 continue; 8006 } 8007 8008 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8009 BuiltinMemCpy->getType(), 8010 VK_LValue, Loc, 0).take(); 8011 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8012 } 8013 8014 ASTOwningVector<Expr*> CallArgs(*this); 8015 CallArgs.push_back(To.takeAs<Expr>()); 8016 CallArgs.push_back(From.takeAs<Expr>()); 8017 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8018 ExprResult Call = ExprError(); 8019 if (NeedsCollectableMemCpy) 8020 Call = ActOnCallExpr(/*Scope=*/0, 8021 CollectableMemCpyRef, 8022 Loc, move_arg(CallArgs), 8023 Loc); 8024 else 8025 Call = ActOnCallExpr(/*Scope=*/0, 8026 BuiltinMemCpyRef, 8027 Loc, move_arg(CallArgs), 8028 Loc); 8029 8030 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8031 Statements.push_back(Call.takeAs<Expr>()); 8032 continue; 8033 } 8034 8035 // Build the move of this field. 8036 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8037 To.get(), From.get(), 8038 /*CopyingBaseSubobject=*/false, 8039 /*Copying=*/false); 8040 if (Move.isInvalid()) { 8041 Diag(CurrentLocation, diag::note_member_synthesized_at) 8042 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8043 MoveAssignOperator->setInvalidDecl(); 8044 return; 8045 } 8046 8047 // Success! Record the copy. 8048 Statements.push_back(Move.takeAs<Stmt>()); 8049 } 8050 8051 if (!Invalid) { 8052 // Add a "return *this;" 8053 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8054 8055 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8056 if (Return.isInvalid()) 8057 Invalid = true; 8058 else { 8059 Statements.push_back(Return.takeAs<Stmt>()); 8060 8061 if (Trap.hasErrorOccurred()) { 8062 Diag(CurrentLocation, diag::note_member_synthesized_at) 8063 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8064 Invalid = true; 8065 } 8066 } 8067 } 8068 8069 if (Invalid) { 8070 MoveAssignOperator->setInvalidDecl(); 8071 return; 8072 } 8073 8074 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8075 /*isStmtExpr=*/false); 8076 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8077 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8078 8079 if (ASTMutationListener *L = getASTMutationListener()) { 8080 L->CompletedImplicitDefinition(MoveAssignOperator); 8081 } 8082} 8083 8084std::pair<Sema::ImplicitExceptionSpecification, bool> 8085Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8086 if (ClassDecl->isInvalidDecl()) 8087 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8088 8089 // C++ [class.copy]p5: 8090 // The implicitly-declared copy constructor for a class X will 8091 // have the form 8092 // 8093 // X::X(const X&) 8094 // 8095 // if 8096 // FIXME: It ought to be possible to store this on the record. 8097 bool HasConstCopyConstructor = true; 8098 8099 // -- each direct or virtual base class B of X has a copy 8100 // constructor whose first parameter is of type const B& or 8101 // const volatile B&, and 8102 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8103 BaseEnd = ClassDecl->bases_end(); 8104 HasConstCopyConstructor && Base != BaseEnd; 8105 ++Base) { 8106 // Virtual bases are handled below. 8107 if (Base->isVirtual()) 8108 continue; 8109 8110 CXXRecordDecl *BaseClassDecl 8111 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8112 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8113 &HasConstCopyConstructor); 8114 } 8115 8116 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8117 BaseEnd = ClassDecl->vbases_end(); 8118 HasConstCopyConstructor && Base != BaseEnd; 8119 ++Base) { 8120 CXXRecordDecl *BaseClassDecl 8121 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8122 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8123 &HasConstCopyConstructor); 8124 } 8125 8126 // -- for all the nonstatic data members of X that are of a 8127 // class type M (or array thereof), each such class type 8128 // has a copy constructor whose first parameter is of type 8129 // const M& or const volatile M&. 8130 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8131 FieldEnd = ClassDecl->field_end(); 8132 HasConstCopyConstructor && Field != FieldEnd; 8133 ++Field) { 8134 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8135 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8136 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8137 &HasConstCopyConstructor); 8138 } 8139 } 8140 // Otherwise, the implicitly declared copy constructor will have 8141 // the form 8142 // 8143 // X::X(X&) 8144 8145 // C++ [except.spec]p14: 8146 // An implicitly declared special member function (Clause 12) shall have an 8147 // exception-specification. [...] 8148 ImplicitExceptionSpecification ExceptSpec(Context); 8149 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8150 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8151 BaseEnd = ClassDecl->bases_end(); 8152 Base != BaseEnd; 8153 ++Base) { 8154 // Virtual bases are handled below. 8155 if (Base->isVirtual()) 8156 continue; 8157 8158 CXXRecordDecl *BaseClassDecl 8159 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8160 if (CXXConstructorDecl *CopyConstructor = 8161 LookupCopyingConstructor(BaseClassDecl, Quals)) 8162 ExceptSpec.CalledDecl(CopyConstructor); 8163 } 8164 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8165 BaseEnd = ClassDecl->vbases_end(); 8166 Base != BaseEnd; 8167 ++Base) { 8168 CXXRecordDecl *BaseClassDecl 8169 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8170 if (CXXConstructorDecl *CopyConstructor = 8171 LookupCopyingConstructor(BaseClassDecl, Quals)) 8172 ExceptSpec.CalledDecl(CopyConstructor); 8173 } 8174 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8175 FieldEnd = ClassDecl->field_end(); 8176 Field != FieldEnd; 8177 ++Field) { 8178 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8179 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8180 if (CXXConstructorDecl *CopyConstructor = 8181 LookupCopyingConstructor(FieldClassDecl, Quals)) 8182 ExceptSpec.CalledDecl(CopyConstructor); 8183 } 8184 } 8185 8186 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8187} 8188 8189CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8190 CXXRecordDecl *ClassDecl) { 8191 // C++ [class.copy]p4: 8192 // If the class definition does not explicitly declare a copy 8193 // constructor, one is declared implicitly. 8194 8195 ImplicitExceptionSpecification Spec(Context); 8196 bool Const; 8197 llvm::tie(Spec, Const) = 8198 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8199 8200 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8201 QualType ArgType = ClassType; 8202 if (Const) 8203 ArgType = ArgType.withConst(); 8204 ArgType = Context.getLValueReferenceType(ArgType); 8205 8206 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8207 8208 DeclarationName Name 8209 = Context.DeclarationNames.getCXXConstructorName( 8210 Context.getCanonicalType(ClassType)); 8211 SourceLocation ClassLoc = ClassDecl->getLocation(); 8212 DeclarationNameInfo NameInfo(Name, ClassLoc); 8213 8214 // An implicitly-declared copy constructor is an inline public 8215 // member of its class. 8216 CXXConstructorDecl *CopyConstructor 8217 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8218 Context.getFunctionType(Context.VoidTy, 8219 &ArgType, 1, EPI), 8220 /*TInfo=*/0, 8221 /*isExplicit=*/false, 8222 /*isInline=*/true, 8223 /*isImplicitlyDeclared=*/true, 8224 // FIXME: apply the rules for definitions here 8225 /*isConstexpr=*/false); 8226 CopyConstructor->setAccess(AS_public); 8227 CopyConstructor->setDefaulted(); 8228 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8229 8230 // Note that we have declared this constructor. 8231 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8232 8233 // Add the parameter to the constructor. 8234 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8235 ClassLoc, ClassLoc, 8236 /*IdentifierInfo=*/0, 8237 ArgType, /*TInfo=*/0, 8238 SC_None, 8239 SC_None, 0); 8240 CopyConstructor->setParams(&FromParam, 1); 8241 8242 if (Scope *S = getScopeForContext(ClassDecl)) 8243 PushOnScopeChains(CopyConstructor, S, false); 8244 ClassDecl->addDecl(CopyConstructor); 8245 8246 // C++0x [class.copy]p7: 8247 // ... If the class definition declares a move constructor or move 8248 // assignment operator, the implicitly declared constructor is defined as 8249 // deleted; ... 8250 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8251 ClassDecl->hasUserDeclaredMoveAssignment() || 8252 ShouldDeleteCopyConstructor(CopyConstructor)) 8253 CopyConstructor->setDeletedAsWritten(); 8254 8255 return CopyConstructor; 8256} 8257 8258void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8259 CXXConstructorDecl *CopyConstructor) { 8260 assert((CopyConstructor->isDefaulted() && 8261 CopyConstructor->isCopyConstructor() && 8262 !CopyConstructor->doesThisDeclarationHaveABody()) && 8263 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8264 8265 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8266 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8267 8268 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8269 DiagnosticErrorTrap Trap(Diags); 8270 8271 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8272 Trap.hasErrorOccurred()) { 8273 Diag(CurrentLocation, diag::note_member_synthesized_at) 8274 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8275 CopyConstructor->setInvalidDecl(); 8276 } else { 8277 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8278 CopyConstructor->getLocation(), 8279 MultiStmtArg(*this, 0, 0), 8280 /*isStmtExpr=*/false) 8281 .takeAs<Stmt>()); 8282 } 8283 8284 CopyConstructor->setUsed(); 8285 8286 if (ASTMutationListener *L = getASTMutationListener()) { 8287 L->CompletedImplicitDefinition(CopyConstructor); 8288 } 8289} 8290 8291Sema::ImplicitExceptionSpecification 8292Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8293 // C++ [except.spec]p14: 8294 // An implicitly declared special member function (Clause 12) shall have an 8295 // exception-specification. [...] 8296 ImplicitExceptionSpecification ExceptSpec(Context); 8297 if (ClassDecl->isInvalidDecl()) 8298 return ExceptSpec; 8299 8300 // Direct base-class constructors. 8301 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8302 BEnd = ClassDecl->bases_end(); 8303 B != BEnd; ++B) { 8304 if (B->isVirtual()) // Handled below. 8305 continue; 8306 8307 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8308 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8309 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8310 // If this is a deleted function, add it anyway. This might be conformant 8311 // with the standard. This might not. I'm not sure. It might not matter. 8312 if (Constructor) 8313 ExceptSpec.CalledDecl(Constructor); 8314 } 8315 } 8316 8317 // Virtual base-class constructors. 8318 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8319 BEnd = ClassDecl->vbases_end(); 8320 B != BEnd; ++B) { 8321 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8322 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8323 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8324 // If this is a deleted function, add it anyway. This might be conformant 8325 // with the standard. This might not. I'm not sure. It might not matter. 8326 if (Constructor) 8327 ExceptSpec.CalledDecl(Constructor); 8328 } 8329 } 8330 8331 // Field constructors. 8332 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8333 FEnd = ClassDecl->field_end(); 8334 F != FEnd; ++F) { 8335 if (F->hasInClassInitializer()) { 8336 if (Expr *E = F->getInClassInitializer()) 8337 ExceptSpec.CalledExpr(E); 8338 else if (!F->isInvalidDecl()) 8339 ExceptSpec.SetDelayed(); 8340 } else if (const RecordType *RecordTy 8341 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8342 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8343 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8344 // If this is a deleted function, add it anyway. This might be conformant 8345 // with the standard. This might not. I'm not sure. It might not matter. 8346 // In particular, the problem is that this function never gets called. It 8347 // might just be ill-formed because this function attempts to refer to 8348 // a deleted function here. 8349 if (Constructor) 8350 ExceptSpec.CalledDecl(Constructor); 8351 } 8352 } 8353 8354 return ExceptSpec; 8355} 8356 8357CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8358 CXXRecordDecl *ClassDecl) { 8359 ImplicitExceptionSpecification Spec( 8360 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8361 8362 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8363 QualType ArgType = Context.getRValueReferenceType(ClassType); 8364 8365 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8366 8367 DeclarationName Name 8368 = Context.DeclarationNames.getCXXConstructorName( 8369 Context.getCanonicalType(ClassType)); 8370 SourceLocation ClassLoc = ClassDecl->getLocation(); 8371 DeclarationNameInfo NameInfo(Name, ClassLoc); 8372 8373 // C++0x [class.copy]p11: 8374 // An implicitly-declared copy/move constructor is an inline public 8375 // member of its class. 8376 CXXConstructorDecl *MoveConstructor 8377 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8378 Context.getFunctionType(Context.VoidTy, 8379 &ArgType, 1, EPI), 8380 /*TInfo=*/0, 8381 /*isExplicit=*/false, 8382 /*isInline=*/true, 8383 /*isImplicitlyDeclared=*/true, 8384 // FIXME: apply the rules for definitions here 8385 /*isConstexpr=*/false); 8386 MoveConstructor->setAccess(AS_public); 8387 MoveConstructor->setDefaulted(); 8388 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8389 8390 // Add the parameter to the constructor. 8391 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8392 ClassLoc, ClassLoc, 8393 /*IdentifierInfo=*/0, 8394 ArgType, /*TInfo=*/0, 8395 SC_None, 8396 SC_None, 0); 8397 MoveConstructor->setParams(&FromParam, 1); 8398 8399 // C++0x [class.copy]p9: 8400 // If the definition of a class X does not explicitly declare a move 8401 // constructor, one will be implicitly declared as defaulted if and only if: 8402 // [...] 8403 // - the move constructor would not be implicitly defined as deleted. 8404 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8405 // Cache this result so that we don't try to generate this over and over 8406 // on every lookup, leaking memory and wasting time. 8407 ClassDecl->setFailedImplicitMoveConstructor(); 8408 return 0; 8409 } 8410 8411 // Note that we have declared this constructor. 8412 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8413 8414 if (Scope *S = getScopeForContext(ClassDecl)) 8415 PushOnScopeChains(MoveConstructor, S, false); 8416 ClassDecl->addDecl(MoveConstructor); 8417 8418 return MoveConstructor; 8419} 8420 8421void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8422 CXXConstructorDecl *MoveConstructor) { 8423 assert((MoveConstructor->isDefaulted() && 8424 MoveConstructor->isMoveConstructor() && 8425 !MoveConstructor->doesThisDeclarationHaveABody()) && 8426 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8427 8428 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8429 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8430 8431 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8432 DiagnosticErrorTrap Trap(Diags); 8433 8434 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8435 Trap.hasErrorOccurred()) { 8436 Diag(CurrentLocation, diag::note_member_synthesized_at) 8437 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8438 MoveConstructor->setInvalidDecl(); 8439 } else { 8440 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8441 MoveConstructor->getLocation(), 8442 MultiStmtArg(*this, 0, 0), 8443 /*isStmtExpr=*/false) 8444 .takeAs<Stmt>()); 8445 } 8446 8447 MoveConstructor->setUsed(); 8448 8449 if (ASTMutationListener *L = getASTMutationListener()) { 8450 L->CompletedImplicitDefinition(MoveConstructor); 8451 } 8452} 8453 8454ExprResult 8455Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8456 CXXConstructorDecl *Constructor, 8457 MultiExprArg ExprArgs, 8458 bool RequiresZeroInit, 8459 unsigned ConstructKind, 8460 SourceRange ParenRange) { 8461 bool Elidable = false; 8462 8463 // C++0x [class.copy]p34: 8464 // When certain criteria are met, an implementation is allowed to 8465 // omit the copy/move construction of a class object, even if the 8466 // copy/move constructor and/or destructor for the object have 8467 // side effects. [...] 8468 // - when a temporary class object that has not been bound to a 8469 // reference (12.2) would be copied/moved to a class object 8470 // with the same cv-unqualified type, the copy/move operation 8471 // can be omitted by constructing the temporary object 8472 // directly into the target of the omitted copy/move 8473 if (ConstructKind == CXXConstructExpr::CK_Complete && 8474 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8475 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8476 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8477 } 8478 8479 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8480 Elidable, move(ExprArgs), RequiresZeroInit, 8481 ConstructKind, ParenRange); 8482} 8483 8484/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8485/// including handling of its default argument expressions. 8486ExprResult 8487Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8488 CXXConstructorDecl *Constructor, bool Elidable, 8489 MultiExprArg ExprArgs, 8490 bool RequiresZeroInit, 8491 unsigned ConstructKind, 8492 SourceRange ParenRange) { 8493 unsigned NumExprs = ExprArgs.size(); 8494 Expr **Exprs = (Expr **)ExprArgs.release(); 8495 8496 for (specific_attr_iterator<NonNullAttr> 8497 i = Constructor->specific_attr_begin<NonNullAttr>(), 8498 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8499 const NonNullAttr *NonNull = *i; 8500 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8501 } 8502 8503 MarkDeclarationReferenced(ConstructLoc, Constructor); 8504 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8505 Constructor, Elidable, Exprs, NumExprs, 8506 RequiresZeroInit, 8507 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8508 ParenRange)); 8509} 8510 8511bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8512 CXXConstructorDecl *Constructor, 8513 MultiExprArg Exprs) { 8514 // FIXME: Provide the correct paren SourceRange when available. 8515 ExprResult TempResult = 8516 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8517 move(Exprs), false, CXXConstructExpr::CK_Complete, 8518 SourceRange()); 8519 if (TempResult.isInvalid()) 8520 return true; 8521 8522 Expr *Temp = TempResult.takeAs<Expr>(); 8523 CheckImplicitConversions(Temp, VD->getLocation()); 8524 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8525 Temp = MaybeCreateExprWithCleanups(Temp); 8526 VD->setInit(Temp); 8527 8528 return false; 8529} 8530 8531void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8532 if (VD->isInvalidDecl()) return; 8533 8534 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8535 if (ClassDecl->isInvalidDecl()) return; 8536 if (ClassDecl->hasTrivialDestructor()) return; 8537 if (ClassDecl->isDependentContext()) return; 8538 8539 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8540 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8541 CheckDestructorAccess(VD->getLocation(), Destructor, 8542 PDiag(diag::err_access_dtor_var) 8543 << VD->getDeclName() 8544 << VD->getType()); 8545 8546 if (!VD->hasGlobalStorage()) return; 8547 8548 // Emit warning for non-trivial dtor in global scope (a real global, 8549 // class-static, function-static). 8550 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8551 8552 // TODO: this should be re-enabled for static locals by !CXAAtExit 8553 if (!VD->isStaticLocal()) 8554 Diag(VD->getLocation(), diag::warn_global_destructor); 8555} 8556 8557/// AddCXXDirectInitializerToDecl - This action is called immediately after 8558/// ActOnDeclarator, when a C++ direct initializer is present. 8559/// e.g: "int x(1);" 8560void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8561 SourceLocation LParenLoc, 8562 MultiExprArg Exprs, 8563 SourceLocation RParenLoc, 8564 bool TypeMayContainAuto) { 8565 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8566 8567 // If there is no declaration, there was an error parsing it. Just ignore 8568 // the initializer. 8569 if (RealDecl == 0) 8570 return; 8571 8572 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8573 if (!VDecl) { 8574 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8575 RealDecl->setInvalidDecl(); 8576 return; 8577 } 8578 8579 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8580 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8581 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8582 if (Exprs.size() > 1) { 8583 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8584 diag::err_auto_var_init_multiple_expressions) 8585 << VDecl->getDeclName() << VDecl->getType() 8586 << VDecl->getSourceRange(); 8587 RealDecl->setInvalidDecl(); 8588 return; 8589 } 8590 8591 Expr *Init = Exprs.get()[0]; 8592 TypeSourceInfo *DeducedType = 0; 8593 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8594 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8595 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8596 << Init->getSourceRange(); 8597 if (!DeducedType) { 8598 RealDecl->setInvalidDecl(); 8599 return; 8600 } 8601 VDecl->setTypeSourceInfo(DeducedType); 8602 VDecl->setType(DeducedType->getType()); 8603 8604 // In ARC, infer lifetime. 8605 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8606 VDecl->setInvalidDecl(); 8607 8608 // If this is a redeclaration, check that the type we just deduced matches 8609 // the previously declared type. 8610 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8611 MergeVarDeclTypes(VDecl, Old); 8612 } 8613 8614 // We will represent direct-initialization similarly to copy-initialization: 8615 // int x(1); -as-> int x = 1; 8616 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8617 // 8618 // Clients that want to distinguish between the two forms, can check for 8619 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8620 // A major benefit is that clients that don't particularly care about which 8621 // exactly form was it (like the CodeGen) can handle both cases without 8622 // special case code. 8623 8624 // C++ 8.5p11: 8625 // The form of initialization (using parentheses or '=') is generally 8626 // insignificant, but does matter when the entity being initialized has a 8627 // class type. 8628 8629 if (!VDecl->getType()->isDependentType() && 8630 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8631 diag::err_typecheck_decl_incomplete_type)) { 8632 VDecl->setInvalidDecl(); 8633 return; 8634 } 8635 8636 // The variable can not have an abstract class type. 8637 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8638 diag::err_abstract_type_in_decl, 8639 AbstractVariableType)) 8640 VDecl->setInvalidDecl(); 8641 8642 const VarDecl *Def; 8643 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8644 Diag(VDecl->getLocation(), diag::err_redefinition) 8645 << VDecl->getDeclName(); 8646 Diag(Def->getLocation(), diag::note_previous_definition); 8647 VDecl->setInvalidDecl(); 8648 return; 8649 } 8650 8651 // C++ [class.static.data]p4 8652 // If a static data member is of const integral or const 8653 // enumeration type, its declaration in the class definition can 8654 // specify a constant-initializer which shall be an integral 8655 // constant expression (5.19). In that case, the member can appear 8656 // in integral constant expressions. The member shall still be 8657 // defined in a namespace scope if it is used in the program and the 8658 // namespace scope definition shall not contain an initializer. 8659 // 8660 // We already performed a redefinition check above, but for static 8661 // data members we also need to check whether there was an in-class 8662 // declaration with an initializer. 8663 const VarDecl* PrevInit = 0; 8664 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8665 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8666 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8667 return; 8668 } 8669 8670 bool IsDependent = false; 8671 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8672 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8673 VDecl->setInvalidDecl(); 8674 return; 8675 } 8676 8677 if (Exprs.get()[I]->isTypeDependent()) 8678 IsDependent = true; 8679 } 8680 8681 // If either the declaration has a dependent type or if any of the 8682 // expressions is type-dependent, we represent the initialization 8683 // via a ParenListExpr for later use during template instantiation. 8684 if (VDecl->getType()->isDependentType() || IsDependent) { 8685 // Let clients know that initialization was done with a direct initializer. 8686 VDecl->setCXXDirectInitializer(true); 8687 8688 // Store the initialization expressions as a ParenListExpr. 8689 unsigned NumExprs = Exprs.size(); 8690 VDecl->setInit(new (Context) ParenListExpr( 8691 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8692 VDecl->getType().getNonReferenceType())); 8693 return; 8694 } 8695 8696 // Capture the variable that is being initialized and the style of 8697 // initialization. 8698 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8699 8700 // FIXME: Poor source location information. 8701 InitializationKind Kind 8702 = InitializationKind::CreateDirect(VDecl->getLocation(), 8703 LParenLoc, RParenLoc); 8704 8705 InitializationSequence InitSeq(*this, Entity, Kind, 8706 Exprs.get(), Exprs.size()); 8707 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 8708 if (Result.isInvalid()) { 8709 VDecl->setInvalidDecl(); 8710 return; 8711 } 8712 8713 CheckImplicitConversions(Result.get(), LParenLoc); 8714 8715 Result = MaybeCreateExprWithCleanups(Result); 8716 VDecl->setInit(Result.takeAs<Expr>()); 8717 VDecl->setCXXDirectInitializer(true); 8718 8719 CheckCompleteVariableDeclaration(VDecl); 8720} 8721 8722/// \brief Given a constructor and the set of arguments provided for the 8723/// constructor, convert the arguments and add any required default arguments 8724/// to form a proper call to this constructor. 8725/// 8726/// \returns true if an error occurred, false otherwise. 8727bool 8728Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8729 MultiExprArg ArgsPtr, 8730 SourceLocation Loc, 8731 ASTOwningVector<Expr*> &ConvertedArgs) { 8732 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8733 unsigned NumArgs = ArgsPtr.size(); 8734 Expr **Args = (Expr **)ArgsPtr.get(); 8735 8736 const FunctionProtoType *Proto 8737 = Constructor->getType()->getAs<FunctionProtoType>(); 8738 assert(Proto && "Constructor without a prototype?"); 8739 unsigned NumArgsInProto = Proto->getNumArgs(); 8740 8741 // If too few arguments are available, we'll fill in the rest with defaults. 8742 if (NumArgs < NumArgsInProto) 8743 ConvertedArgs.reserve(NumArgsInProto); 8744 else 8745 ConvertedArgs.reserve(NumArgs); 8746 8747 VariadicCallType CallType = 8748 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8749 SmallVector<Expr *, 8> AllArgs; 8750 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8751 Proto, 0, Args, NumArgs, AllArgs, 8752 CallType); 8753 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 8754 ConvertedArgs.push_back(AllArgs[i]); 8755 return Invalid; 8756} 8757 8758static inline bool 8759CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8760 const FunctionDecl *FnDecl) { 8761 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8762 if (isa<NamespaceDecl>(DC)) { 8763 return SemaRef.Diag(FnDecl->getLocation(), 8764 diag::err_operator_new_delete_declared_in_namespace) 8765 << FnDecl->getDeclName(); 8766 } 8767 8768 if (isa<TranslationUnitDecl>(DC) && 8769 FnDecl->getStorageClass() == SC_Static) { 8770 return SemaRef.Diag(FnDecl->getLocation(), 8771 diag::err_operator_new_delete_declared_static) 8772 << FnDecl->getDeclName(); 8773 } 8774 8775 return false; 8776} 8777 8778static inline bool 8779CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8780 CanQualType ExpectedResultType, 8781 CanQualType ExpectedFirstParamType, 8782 unsigned DependentParamTypeDiag, 8783 unsigned InvalidParamTypeDiag) { 8784 QualType ResultType = 8785 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 8786 8787 // Check that the result type is not dependent. 8788 if (ResultType->isDependentType()) 8789 return SemaRef.Diag(FnDecl->getLocation(), 8790 diag::err_operator_new_delete_dependent_result_type) 8791 << FnDecl->getDeclName() << ExpectedResultType; 8792 8793 // Check that the result type is what we expect. 8794 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 8795 return SemaRef.Diag(FnDecl->getLocation(), 8796 diag::err_operator_new_delete_invalid_result_type) 8797 << FnDecl->getDeclName() << ExpectedResultType; 8798 8799 // A function template must have at least 2 parameters. 8800 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 8801 return SemaRef.Diag(FnDecl->getLocation(), 8802 diag::err_operator_new_delete_template_too_few_parameters) 8803 << FnDecl->getDeclName(); 8804 8805 // The function decl must have at least 1 parameter. 8806 if (FnDecl->getNumParams() == 0) 8807 return SemaRef.Diag(FnDecl->getLocation(), 8808 diag::err_operator_new_delete_too_few_parameters) 8809 << FnDecl->getDeclName(); 8810 8811 // Check the the first parameter type is not dependent. 8812 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 8813 if (FirstParamType->isDependentType()) 8814 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 8815 << FnDecl->getDeclName() << ExpectedFirstParamType; 8816 8817 // Check that the first parameter type is what we expect. 8818 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 8819 ExpectedFirstParamType) 8820 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 8821 << FnDecl->getDeclName() << ExpectedFirstParamType; 8822 8823 return false; 8824} 8825 8826static bool 8827CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8828 // C++ [basic.stc.dynamic.allocation]p1: 8829 // A program is ill-formed if an allocation function is declared in a 8830 // namespace scope other than global scope or declared static in global 8831 // scope. 8832 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8833 return true; 8834 8835 CanQualType SizeTy = 8836 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 8837 8838 // C++ [basic.stc.dynamic.allocation]p1: 8839 // The return type shall be void*. The first parameter shall have type 8840 // std::size_t. 8841 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 8842 SizeTy, 8843 diag::err_operator_new_dependent_param_type, 8844 diag::err_operator_new_param_type)) 8845 return true; 8846 8847 // C++ [basic.stc.dynamic.allocation]p1: 8848 // The first parameter shall not have an associated default argument. 8849 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 8850 return SemaRef.Diag(FnDecl->getLocation(), 8851 diag::err_operator_new_default_arg) 8852 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 8853 8854 return false; 8855} 8856 8857static bool 8858CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8859 // C++ [basic.stc.dynamic.deallocation]p1: 8860 // A program is ill-formed if deallocation functions are declared in a 8861 // namespace scope other than global scope or declared static in global 8862 // scope. 8863 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8864 return true; 8865 8866 // C++ [basic.stc.dynamic.deallocation]p2: 8867 // Each deallocation function shall return void and its first parameter 8868 // shall be void*. 8869 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 8870 SemaRef.Context.VoidPtrTy, 8871 diag::err_operator_delete_dependent_param_type, 8872 diag::err_operator_delete_param_type)) 8873 return true; 8874 8875 return false; 8876} 8877 8878/// CheckOverloadedOperatorDeclaration - Check whether the declaration 8879/// of this overloaded operator is well-formed. If so, returns false; 8880/// otherwise, emits appropriate diagnostics and returns true. 8881bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 8882 assert(FnDecl && FnDecl->isOverloadedOperator() && 8883 "Expected an overloaded operator declaration"); 8884 8885 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 8886 8887 // C++ [over.oper]p5: 8888 // The allocation and deallocation functions, operator new, 8889 // operator new[], operator delete and operator delete[], are 8890 // described completely in 3.7.3. The attributes and restrictions 8891 // found in the rest of this subclause do not apply to them unless 8892 // explicitly stated in 3.7.3. 8893 if (Op == OO_Delete || Op == OO_Array_Delete) 8894 return CheckOperatorDeleteDeclaration(*this, FnDecl); 8895 8896 if (Op == OO_New || Op == OO_Array_New) 8897 return CheckOperatorNewDeclaration(*this, FnDecl); 8898 8899 // C++ [over.oper]p6: 8900 // An operator function shall either be a non-static member 8901 // function or be a non-member function and have at least one 8902 // parameter whose type is a class, a reference to a class, an 8903 // enumeration, or a reference to an enumeration. 8904 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 8905 if (MethodDecl->isStatic()) 8906 return Diag(FnDecl->getLocation(), 8907 diag::err_operator_overload_static) << FnDecl->getDeclName(); 8908 } else { 8909 bool ClassOrEnumParam = false; 8910 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 8911 ParamEnd = FnDecl->param_end(); 8912 Param != ParamEnd; ++Param) { 8913 QualType ParamType = (*Param)->getType().getNonReferenceType(); 8914 if (ParamType->isDependentType() || ParamType->isRecordType() || 8915 ParamType->isEnumeralType()) { 8916 ClassOrEnumParam = true; 8917 break; 8918 } 8919 } 8920 8921 if (!ClassOrEnumParam) 8922 return Diag(FnDecl->getLocation(), 8923 diag::err_operator_overload_needs_class_or_enum) 8924 << FnDecl->getDeclName(); 8925 } 8926 8927 // C++ [over.oper]p8: 8928 // An operator function cannot have default arguments (8.3.6), 8929 // except where explicitly stated below. 8930 // 8931 // Only the function-call operator allows default arguments 8932 // (C++ [over.call]p1). 8933 if (Op != OO_Call) { 8934 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8935 Param != FnDecl->param_end(); ++Param) { 8936 if ((*Param)->hasDefaultArg()) 8937 return Diag((*Param)->getLocation(), 8938 diag::err_operator_overload_default_arg) 8939 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 8940 } 8941 } 8942 8943 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 8944 { false, false, false } 8945#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 8946 , { Unary, Binary, MemberOnly } 8947#include "clang/Basic/OperatorKinds.def" 8948 }; 8949 8950 bool CanBeUnaryOperator = OperatorUses[Op][0]; 8951 bool CanBeBinaryOperator = OperatorUses[Op][1]; 8952 bool MustBeMemberOperator = OperatorUses[Op][2]; 8953 8954 // C++ [over.oper]p8: 8955 // [...] Operator functions cannot have more or fewer parameters 8956 // than the number required for the corresponding operator, as 8957 // described in the rest of this subclause. 8958 unsigned NumParams = FnDecl->getNumParams() 8959 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 8960 if (Op != OO_Call && 8961 ((NumParams == 1 && !CanBeUnaryOperator) || 8962 (NumParams == 2 && !CanBeBinaryOperator) || 8963 (NumParams < 1) || (NumParams > 2))) { 8964 // We have the wrong number of parameters. 8965 unsigned ErrorKind; 8966 if (CanBeUnaryOperator && CanBeBinaryOperator) { 8967 ErrorKind = 2; // 2 -> unary or binary. 8968 } else if (CanBeUnaryOperator) { 8969 ErrorKind = 0; // 0 -> unary 8970 } else { 8971 assert(CanBeBinaryOperator && 8972 "All non-call overloaded operators are unary or binary!"); 8973 ErrorKind = 1; // 1 -> binary 8974 } 8975 8976 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 8977 << FnDecl->getDeclName() << NumParams << ErrorKind; 8978 } 8979 8980 // Overloaded operators other than operator() cannot be variadic. 8981 if (Op != OO_Call && 8982 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 8983 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 8984 << FnDecl->getDeclName(); 8985 } 8986 8987 // Some operators must be non-static member functions. 8988 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 8989 return Diag(FnDecl->getLocation(), 8990 diag::err_operator_overload_must_be_member) 8991 << FnDecl->getDeclName(); 8992 } 8993 8994 // C++ [over.inc]p1: 8995 // The user-defined function called operator++ implements the 8996 // prefix and postfix ++ operator. If this function is a member 8997 // function with no parameters, or a non-member function with one 8998 // parameter of class or enumeration type, it defines the prefix 8999 // increment operator ++ for objects of that type. If the function 9000 // is a member function with one parameter (which shall be of type 9001 // int) or a non-member function with two parameters (the second 9002 // of which shall be of type int), it defines the postfix 9003 // increment operator ++ for objects of that type. 9004 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9005 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9006 bool ParamIsInt = false; 9007 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9008 ParamIsInt = BT->getKind() == BuiltinType::Int; 9009 9010 if (!ParamIsInt) 9011 return Diag(LastParam->getLocation(), 9012 diag::err_operator_overload_post_incdec_must_be_int) 9013 << LastParam->getType() << (Op == OO_MinusMinus); 9014 } 9015 9016 return false; 9017} 9018 9019/// CheckLiteralOperatorDeclaration - Check whether the declaration 9020/// of this literal operator function is well-formed. If so, returns 9021/// false; otherwise, emits appropriate diagnostics and returns true. 9022bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9023 DeclContext *DC = FnDecl->getDeclContext(); 9024 Decl::Kind Kind = DC->getDeclKind(); 9025 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9026 Kind != Decl::LinkageSpec) { 9027 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9028 << FnDecl->getDeclName(); 9029 return true; 9030 } 9031 9032 bool Valid = false; 9033 9034 // template <char...> type operator "" name() is the only valid template 9035 // signature, and the only valid signature with no parameters. 9036 if (FnDecl->param_size() == 0) { 9037 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9038 // Must have only one template parameter 9039 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9040 if (Params->size() == 1) { 9041 NonTypeTemplateParmDecl *PmDecl = 9042 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9043 9044 // The template parameter must be a char parameter pack. 9045 if (PmDecl && PmDecl->isTemplateParameterPack() && 9046 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9047 Valid = true; 9048 } 9049 } 9050 } else { 9051 // Check the first parameter 9052 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9053 9054 QualType T = (*Param)->getType(); 9055 9056 // unsigned long long int, long double, and any character type are allowed 9057 // as the only parameters. 9058 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9059 Context.hasSameType(T, Context.LongDoubleTy) || 9060 Context.hasSameType(T, Context.CharTy) || 9061 Context.hasSameType(T, Context.WCharTy) || 9062 Context.hasSameType(T, Context.Char16Ty) || 9063 Context.hasSameType(T, Context.Char32Ty)) { 9064 if (++Param == FnDecl->param_end()) 9065 Valid = true; 9066 goto FinishedParams; 9067 } 9068 9069 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9070 const PointerType *PT = T->getAs<PointerType>(); 9071 if (!PT) 9072 goto FinishedParams; 9073 T = PT->getPointeeType(); 9074 if (!T.isConstQualified()) 9075 goto FinishedParams; 9076 T = T.getUnqualifiedType(); 9077 9078 // Move on to the second parameter; 9079 ++Param; 9080 9081 // If there is no second parameter, the first must be a const char * 9082 if (Param == FnDecl->param_end()) { 9083 if (Context.hasSameType(T, Context.CharTy)) 9084 Valid = true; 9085 goto FinishedParams; 9086 } 9087 9088 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9089 // are allowed as the first parameter to a two-parameter function 9090 if (!(Context.hasSameType(T, Context.CharTy) || 9091 Context.hasSameType(T, Context.WCharTy) || 9092 Context.hasSameType(T, Context.Char16Ty) || 9093 Context.hasSameType(T, Context.Char32Ty))) 9094 goto FinishedParams; 9095 9096 // The second and final parameter must be an std::size_t 9097 T = (*Param)->getType().getUnqualifiedType(); 9098 if (Context.hasSameType(T, Context.getSizeType()) && 9099 ++Param == FnDecl->param_end()) 9100 Valid = true; 9101 } 9102 9103 // FIXME: This diagnostic is absolutely terrible. 9104FinishedParams: 9105 if (!Valid) { 9106 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9107 << FnDecl->getDeclName(); 9108 return true; 9109 } 9110 9111 StringRef LiteralName 9112 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9113 if (LiteralName[0] != '_') { 9114 // C++0x [usrlit.suffix]p1: 9115 // Literal suffix identifiers that do not start with an underscore are 9116 // reserved for future standardization. 9117 bool IsHexFloat = true; 9118 if (LiteralName.size() > 1 && 9119 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9120 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9121 if (!isdigit(LiteralName[I])) { 9122 IsHexFloat = false; 9123 break; 9124 } 9125 } 9126 } 9127 9128 if (IsHexFloat) 9129 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9130 << LiteralName; 9131 else 9132 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9133 } 9134 9135 return false; 9136} 9137 9138/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9139/// linkage specification, including the language and (if present) 9140/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9141/// the location of the language string literal, which is provided 9142/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9143/// the '{' brace. Otherwise, this linkage specification does not 9144/// have any braces. 9145Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9146 SourceLocation LangLoc, 9147 StringRef Lang, 9148 SourceLocation LBraceLoc) { 9149 LinkageSpecDecl::LanguageIDs Language; 9150 if (Lang == "\"C\"") 9151 Language = LinkageSpecDecl::lang_c; 9152 else if (Lang == "\"C++\"") 9153 Language = LinkageSpecDecl::lang_cxx; 9154 else { 9155 Diag(LangLoc, diag::err_bad_language); 9156 return 0; 9157 } 9158 9159 // FIXME: Add all the various semantics of linkage specifications 9160 9161 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9162 ExternLoc, LangLoc, Language); 9163 CurContext->addDecl(D); 9164 PushDeclContext(S, D); 9165 return D; 9166} 9167 9168/// ActOnFinishLinkageSpecification - Complete the definition of 9169/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9170/// valid, it's the position of the closing '}' brace in a linkage 9171/// specification that uses braces. 9172Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9173 Decl *LinkageSpec, 9174 SourceLocation RBraceLoc) { 9175 if (LinkageSpec) { 9176 if (RBraceLoc.isValid()) { 9177 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9178 LSDecl->setRBraceLoc(RBraceLoc); 9179 } 9180 PopDeclContext(); 9181 } 9182 return LinkageSpec; 9183} 9184 9185/// \brief Perform semantic analysis for the variable declaration that 9186/// occurs within a C++ catch clause, returning the newly-created 9187/// variable. 9188VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9189 TypeSourceInfo *TInfo, 9190 SourceLocation StartLoc, 9191 SourceLocation Loc, 9192 IdentifierInfo *Name) { 9193 bool Invalid = false; 9194 QualType ExDeclType = TInfo->getType(); 9195 9196 // Arrays and functions decay. 9197 if (ExDeclType->isArrayType()) 9198 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9199 else if (ExDeclType->isFunctionType()) 9200 ExDeclType = Context.getPointerType(ExDeclType); 9201 9202 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9203 // The exception-declaration shall not denote a pointer or reference to an 9204 // incomplete type, other than [cv] void*. 9205 // N2844 forbids rvalue references. 9206 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9207 Diag(Loc, diag::err_catch_rvalue_ref); 9208 Invalid = true; 9209 } 9210 9211 // GCC allows catching pointers and references to incomplete types 9212 // as an extension; so do we, but we warn by default. 9213 9214 QualType BaseType = ExDeclType; 9215 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9216 unsigned DK = diag::err_catch_incomplete; 9217 bool IncompleteCatchIsInvalid = true; 9218 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9219 BaseType = Ptr->getPointeeType(); 9220 Mode = 1; 9221 DK = diag::ext_catch_incomplete_ptr; 9222 IncompleteCatchIsInvalid = false; 9223 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9224 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9225 BaseType = Ref->getPointeeType(); 9226 Mode = 2; 9227 DK = diag::ext_catch_incomplete_ref; 9228 IncompleteCatchIsInvalid = false; 9229 } 9230 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9231 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9232 IncompleteCatchIsInvalid) 9233 Invalid = true; 9234 9235 if (!Invalid && !ExDeclType->isDependentType() && 9236 RequireNonAbstractType(Loc, ExDeclType, 9237 diag::err_abstract_type_in_decl, 9238 AbstractVariableType)) 9239 Invalid = true; 9240 9241 // Only the non-fragile NeXT runtime currently supports C++ catches 9242 // of ObjC types, and no runtime supports catching ObjC types by value. 9243 if (!Invalid && getLangOptions().ObjC1) { 9244 QualType T = ExDeclType; 9245 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9246 T = RT->getPointeeType(); 9247 9248 if (T->isObjCObjectType()) { 9249 Diag(Loc, diag::err_objc_object_catch); 9250 Invalid = true; 9251 } else if (T->isObjCObjectPointerType()) { 9252 if (!getLangOptions().ObjCNonFragileABI) 9253 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9254 } 9255 } 9256 9257 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9258 ExDeclType, TInfo, SC_None, SC_None); 9259 ExDecl->setExceptionVariable(true); 9260 9261 if (!Invalid && !ExDeclType->isDependentType()) { 9262 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9263 // C++ [except.handle]p16: 9264 // The object declared in an exception-declaration or, if the 9265 // exception-declaration does not specify a name, a temporary (12.2) is 9266 // copy-initialized (8.5) from the exception object. [...] 9267 // The object is destroyed when the handler exits, after the destruction 9268 // of any automatic objects initialized within the handler. 9269 // 9270 // We just pretend to initialize the object with itself, then make sure 9271 // it can be destroyed later. 9272 QualType initType = ExDeclType; 9273 9274 InitializedEntity entity = 9275 InitializedEntity::InitializeVariable(ExDecl); 9276 InitializationKind initKind = 9277 InitializationKind::CreateCopy(Loc, SourceLocation()); 9278 9279 Expr *opaqueValue = 9280 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9281 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9282 ExprResult result = sequence.Perform(*this, entity, initKind, 9283 MultiExprArg(&opaqueValue, 1)); 9284 if (result.isInvalid()) 9285 Invalid = true; 9286 else { 9287 // If the constructor used was non-trivial, set this as the 9288 // "initializer". 9289 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9290 if (!construct->getConstructor()->isTrivial()) { 9291 Expr *init = MaybeCreateExprWithCleanups(construct); 9292 ExDecl->setInit(init); 9293 } 9294 9295 // And make sure it's destructable. 9296 FinalizeVarWithDestructor(ExDecl, recordType); 9297 } 9298 } 9299 } 9300 9301 if (Invalid) 9302 ExDecl->setInvalidDecl(); 9303 9304 return ExDecl; 9305} 9306 9307/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9308/// handler. 9309Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9310 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9311 bool Invalid = D.isInvalidType(); 9312 9313 // Check for unexpanded parameter packs. 9314 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9315 UPPC_ExceptionType)) { 9316 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9317 D.getIdentifierLoc()); 9318 Invalid = true; 9319 } 9320 9321 IdentifierInfo *II = D.getIdentifier(); 9322 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9323 LookupOrdinaryName, 9324 ForRedeclaration)) { 9325 // The scope should be freshly made just for us. There is just no way 9326 // it contains any previous declaration. 9327 assert(!S->isDeclScope(PrevDecl)); 9328 if (PrevDecl->isTemplateParameter()) { 9329 // Maybe we will complain about the shadowed template parameter. 9330 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9331 } 9332 } 9333 9334 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9335 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9336 << D.getCXXScopeSpec().getRange(); 9337 Invalid = true; 9338 } 9339 9340 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9341 D.getSourceRange().getBegin(), 9342 D.getIdentifierLoc(), 9343 D.getIdentifier()); 9344 if (Invalid) 9345 ExDecl->setInvalidDecl(); 9346 9347 // Add the exception declaration into this scope. 9348 if (II) 9349 PushOnScopeChains(ExDecl, S); 9350 else 9351 CurContext->addDecl(ExDecl); 9352 9353 ProcessDeclAttributes(S, ExDecl, D); 9354 return ExDecl; 9355} 9356 9357Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9358 Expr *AssertExpr, 9359 Expr *AssertMessageExpr_, 9360 SourceLocation RParenLoc) { 9361 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9362 9363 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9364 llvm::APSInt Value(32); 9365 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9366 Diag(StaticAssertLoc, 9367 diag::err_static_assert_expression_is_not_constant) << 9368 AssertExpr->getSourceRange(); 9369 return 0; 9370 } 9371 9372 if (Value == 0) { 9373 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9374 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9375 } 9376 } 9377 9378 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9379 return 0; 9380 9381 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9382 AssertExpr, AssertMessage, RParenLoc); 9383 9384 CurContext->addDecl(Decl); 9385 return Decl; 9386} 9387 9388/// \brief Perform semantic analysis of the given friend type declaration. 9389/// 9390/// \returns A friend declaration that. 9391FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9392 TypeSourceInfo *TSInfo) { 9393 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9394 9395 QualType T = TSInfo->getType(); 9396 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9397 9398 if (!getLangOptions().CPlusPlus0x) { 9399 // C++03 [class.friend]p2: 9400 // An elaborated-type-specifier shall be used in a friend declaration 9401 // for a class.* 9402 // 9403 // * The class-key of the elaborated-type-specifier is required. 9404 if (!ActiveTemplateInstantiations.empty()) { 9405 // Do not complain about the form of friend template types during 9406 // template instantiation; we will already have complained when the 9407 // template was declared. 9408 } else if (!T->isElaboratedTypeSpecifier()) { 9409 // If we evaluated the type to a record type, suggest putting 9410 // a tag in front. 9411 if (const RecordType *RT = T->getAs<RecordType>()) { 9412 RecordDecl *RD = RT->getDecl(); 9413 9414 std::string InsertionText = std::string(" ") + RD->getKindName(); 9415 9416 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9417 << (unsigned) RD->getTagKind() 9418 << T 9419 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9420 InsertionText); 9421 } else { 9422 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9423 << T 9424 << SourceRange(FriendLoc, TypeRange.getEnd()); 9425 } 9426 } else if (T->getAs<EnumType>()) { 9427 Diag(FriendLoc, diag::ext_enum_friend) 9428 << T 9429 << SourceRange(FriendLoc, TypeRange.getEnd()); 9430 } 9431 } 9432 9433 // C++0x [class.friend]p3: 9434 // If the type specifier in a friend declaration designates a (possibly 9435 // cv-qualified) class type, that class is declared as a friend; otherwise, 9436 // the friend declaration is ignored. 9437 9438 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9439 // in [class.friend]p3 that we do not implement. 9440 9441 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9442} 9443 9444/// Handle a friend tag declaration where the scope specifier was 9445/// templated. 9446Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9447 unsigned TagSpec, SourceLocation TagLoc, 9448 CXXScopeSpec &SS, 9449 IdentifierInfo *Name, SourceLocation NameLoc, 9450 AttributeList *Attr, 9451 MultiTemplateParamsArg TempParamLists) { 9452 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9453 9454 bool isExplicitSpecialization = false; 9455 bool Invalid = false; 9456 9457 if (TemplateParameterList *TemplateParams 9458 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9459 TempParamLists.get(), 9460 TempParamLists.size(), 9461 /*friend*/ true, 9462 isExplicitSpecialization, 9463 Invalid)) { 9464 if (TemplateParams->size() > 0) { 9465 // This is a declaration of a class template. 9466 if (Invalid) 9467 return 0; 9468 9469 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9470 SS, Name, NameLoc, Attr, 9471 TemplateParams, AS_public, 9472 /*ModulePrivateLoc=*/SourceLocation(), 9473 TempParamLists.size() - 1, 9474 (TemplateParameterList**) TempParamLists.release()).take(); 9475 } else { 9476 // The "template<>" header is extraneous. 9477 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9478 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9479 isExplicitSpecialization = true; 9480 } 9481 } 9482 9483 if (Invalid) return 0; 9484 9485 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9486 9487 bool isAllExplicitSpecializations = true; 9488 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9489 if (TempParamLists.get()[I]->size()) { 9490 isAllExplicitSpecializations = false; 9491 break; 9492 } 9493 } 9494 9495 // FIXME: don't ignore attributes. 9496 9497 // If it's explicit specializations all the way down, just forget 9498 // about the template header and build an appropriate non-templated 9499 // friend. TODO: for source fidelity, remember the headers. 9500 if (isAllExplicitSpecializations) { 9501 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9502 ElaboratedTypeKeyword Keyword 9503 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9504 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9505 *Name, NameLoc); 9506 if (T.isNull()) 9507 return 0; 9508 9509 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9510 if (isa<DependentNameType>(T)) { 9511 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9512 TL.setKeywordLoc(TagLoc); 9513 TL.setQualifierLoc(QualifierLoc); 9514 TL.setNameLoc(NameLoc); 9515 } else { 9516 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9517 TL.setKeywordLoc(TagLoc); 9518 TL.setQualifierLoc(QualifierLoc); 9519 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9520 } 9521 9522 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9523 TSI, FriendLoc); 9524 Friend->setAccess(AS_public); 9525 CurContext->addDecl(Friend); 9526 return Friend; 9527 } 9528 9529 // Handle the case of a templated-scope friend class. e.g. 9530 // template <class T> class A<T>::B; 9531 // FIXME: we don't support these right now. 9532 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9533 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9534 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9535 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9536 TL.setKeywordLoc(TagLoc); 9537 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9538 TL.setNameLoc(NameLoc); 9539 9540 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9541 TSI, FriendLoc); 9542 Friend->setAccess(AS_public); 9543 Friend->setUnsupportedFriend(true); 9544 CurContext->addDecl(Friend); 9545 return Friend; 9546} 9547 9548 9549/// Handle a friend type declaration. This works in tandem with 9550/// ActOnTag. 9551/// 9552/// Notes on friend class templates: 9553/// 9554/// We generally treat friend class declarations as if they were 9555/// declaring a class. So, for example, the elaborated type specifier 9556/// in a friend declaration is required to obey the restrictions of a 9557/// class-head (i.e. no typedefs in the scope chain), template 9558/// parameters are required to match up with simple template-ids, &c. 9559/// However, unlike when declaring a template specialization, it's 9560/// okay to refer to a template specialization without an empty 9561/// template parameter declaration, e.g. 9562/// friend class A<T>::B<unsigned>; 9563/// We permit this as a special case; if there are any template 9564/// parameters present at all, require proper matching, i.e. 9565/// template <> template <class T> friend class A<int>::B; 9566Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9567 MultiTemplateParamsArg TempParams) { 9568 SourceLocation Loc = DS.getSourceRange().getBegin(); 9569 9570 assert(DS.isFriendSpecified()); 9571 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9572 9573 // Try to convert the decl specifier to a type. This works for 9574 // friend templates because ActOnTag never produces a ClassTemplateDecl 9575 // for a TUK_Friend. 9576 Declarator TheDeclarator(DS, Declarator::MemberContext); 9577 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9578 QualType T = TSI->getType(); 9579 if (TheDeclarator.isInvalidType()) 9580 return 0; 9581 9582 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9583 return 0; 9584 9585 // This is definitely an error in C++98. It's probably meant to 9586 // be forbidden in C++0x, too, but the specification is just 9587 // poorly written. 9588 // 9589 // The problem is with declarations like the following: 9590 // template <T> friend A<T>::foo; 9591 // where deciding whether a class C is a friend or not now hinges 9592 // on whether there exists an instantiation of A that causes 9593 // 'foo' to equal C. There are restrictions on class-heads 9594 // (which we declare (by fiat) elaborated friend declarations to 9595 // be) that makes this tractable. 9596 // 9597 // FIXME: handle "template <> friend class A<T>;", which 9598 // is possibly well-formed? Who even knows? 9599 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9600 Diag(Loc, diag::err_tagless_friend_type_template) 9601 << DS.getSourceRange(); 9602 return 0; 9603 } 9604 9605 // C++98 [class.friend]p1: A friend of a class is a function 9606 // or class that is not a member of the class . . . 9607 // This is fixed in DR77, which just barely didn't make the C++03 9608 // deadline. It's also a very silly restriction that seriously 9609 // affects inner classes and which nobody else seems to implement; 9610 // thus we never diagnose it, not even in -pedantic. 9611 // 9612 // But note that we could warn about it: it's always useless to 9613 // friend one of your own members (it's not, however, worthless to 9614 // friend a member of an arbitrary specialization of your template). 9615 9616 Decl *D; 9617 if (unsigned NumTempParamLists = TempParams.size()) 9618 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9619 NumTempParamLists, 9620 TempParams.release(), 9621 TSI, 9622 DS.getFriendSpecLoc()); 9623 else 9624 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9625 9626 if (!D) 9627 return 0; 9628 9629 D->setAccess(AS_public); 9630 CurContext->addDecl(D); 9631 9632 return D; 9633} 9634 9635Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 9636 MultiTemplateParamsArg TemplateParams) { 9637 const DeclSpec &DS = D.getDeclSpec(); 9638 9639 assert(DS.isFriendSpecified()); 9640 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9641 9642 SourceLocation Loc = D.getIdentifierLoc(); 9643 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9644 QualType T = TInfo->getType(); 9645 9646 // C++ [class.friend]p1 9647 // A friend of a class is a function or class.... 9648 // Note that this sees through typedefs, which is intended. 9649 // It *doesn't* see through dependent types, which is correct 9650 // according to [temp.arg.type]p3: 9651 // If a declaration acquires a function type through a 9652 // type dependent on a template-parameter and this causes 9653 // a declaration that does not use the syntactic form of a 9654 // function declarator to have a function type, the program 9655 // is ill-formed. 9656 if (!T->isFunctionType()) { 9657 Diag(Loc, diag::err_unexpected_friend); 9658 9659 // It might be worthwhile to try to recover by creating an 9660 // appropriate declaration. 9661 return 0; 9662 } 9663 9664 // C++ [namespace.memdef]p3 9665 // - If a friend declaration in a non-local class first declares a 9666 // class or function, the friend class or function is a member 9667 // of the innermost enclosing namespace. 9668 // - The name of the friend is not found by simple name lookup 9669 // until a matching declaration is provided in that namespace 9670 // scope (either before or after the class declaration granting 9671 // friendship). 9672 // - If a friend function is called, its name may be found by the 9673 // name lookup that considers functions from namespaces and 9674 // classes associated with the types of the function arguments. 9675 // - When looking for a prior declaration of a class or a function 9676 // declared as a friend, scopes outside the innermost enclosing 9677 // namespace scope are not considered. 9678 9679 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9680 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9681 DeclarationName Name = NameInfo.getName(); 9682 assert(Name); 9683 9684 // Check for unexpanded parameter packs. 9685 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9686 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9687 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9688 return 0; 9689 9690 // The context we found the declaration in, or in which we should 9691 // create the declaration. 9692 DeclContext *DC; 9693 Scope *DCScope = S; 9694 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9695 ForRedeclaration); 9696 9697 // FIXME: there are different rules in local classes 9698 9699 // There are four cases here. 9700 // - There's no scope specifier, in which case we just go to the 9701 // appropriate scope and look for a function or function template 9702 // there as appropriate. 9703 // Recover from invalid scope qualifiers as if they just weren't there. 9704 if (SS.isInvalid() || !SS.isSet()) { 9705 // C++0x [namespace.memdef]p3: 9706 // If the name in a friend declaration is neither qualified nor 9707 // a template-id and the declaration is a function or an 9708 // elaborated-type-specifier, the lookup to determine whether 9709 // the entity has been previously declared shall not consider 9710 // any scopes outside the innermost enclosing namespace. 9711 // C++0x [class.friend]p11: 9712 // If a friend declaration appears in a local class and the name 9713 // specified is an unqualified name, a prior declaration is 9714 // looked up without considering scopes that are outside the 9715 // innermost enclosing non-class scope. For a friend function 9716 // declaration, if there is no prior declaration, the program is 9717 // ill-formed. 9718 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9719 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9720 9721 // Find the appropriate context according to the above. 9722 DC = CurContext; 9723 while (true) { 9724 // Skip class contexts. If someone can cite chapter and verse 9725 // for this behavior, that would be nice --- it's what GCC and 9726 // EDG do, and it seems like a reasonable intent, but the spec 9727 // really only says that checks for unqualified existing 9728 // declarations should stop at the nearest enclosing namespace, 9729 // not that they should only consider the nearest enclosing 9730 // namespace. 9731 while (DC->isRecord()) 9732 DC = DC->getParent(); 9733 9734 LookupQualifiedName(Previous, DC); 9735 9736 // TODO: decide what we think about using declarations. 9737 if (isLocal || !Previous.empty()) 9738 break; 9739 9740 if (isTemplateId) { 9741 if (isa<TranslationUnitDecl>(DC)) break; 9742 } else { 9743 if (DC->isFileContext()) break; 9744 } 9745 DC = DC->getParent(); 9746 } 9747 9748 // C++ [class.friend]p1: A friend of a class is a function or 9749 // class that is not a member of the class . . . 9750 // C++0x changes this for both friend types and functions. 9751 // Most C++ 98 compilers do seem to give an error here, so 9752 // we do, too. 9753 if (!Previous.empty() && DC->Equals(CurContext) 9754 && !getLangOptions().CPlusPlus0x) 9755 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9756 9757 DCScope = getScopeForDeclContext(S, DC); 9758 9759 // - There's a non-dependent scope specifier, in which case we 9760 // compute it and do a previous lookup there for a function 9761 // or function template. 9762 } else if (!SS.getScopeRep()->isDependent()) { 9763 DC = computeDeclContext(SS); 9764 if (!DC) return 0; 9765 9766 if (RequireCompleteDeclContext(SS, DC)) return 0; 9767 9768 LookupQualifiedName(Previous, DC); 9769 9770 // Ignore things found implicitly in the wrong scope. 9771 // TODO: better diagnostics for this case. Suggesting the right 9772 // qualified scope would be nice... 9773 LookupResult::Filter F = Previous.makeFilter(); 9774 while (F.hasNext()) { 9775 NamedDecl *D = F.next(); 9776 if (!DC->InEnclosingNamespaceSetOf( 9777 D->getDeclContext()->getRedeclContext())) 9778 F.erase(); 9779 } 9780 F.done(); 9781 9782 if (Previous.empty()) { 9783 D.setInvalidType(); 9784 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 9785 return 0; 9786 } 9787 9788 // C++ [class.friend]p1: A friend of a class is a function or 9789 // class that is not a member of the class . . . 9790 if (DC->Equals(CurContext)) 9791 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9792 9793 // - There's a scope specifier that does not match any template 9794 // parameter lists, in which case we use some arbitrary context, 9795 // create a method or method template, and wait for instantiation. 9796 // - There's a scope specifier that does match some template 9797 // parameter lists, which we don't handle right now. 9798 } else { 9799 DC = CurContext; 9800 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 9801 } 9802 9803 if (!DC->isRecord()) { 9804 // This implies that it has to be an operator or function. 9805 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 9806 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 9807 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 9808 Diag(Loc, diag::err_introducing_special_friend) << 9809 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 9810 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 9811 return 0; 9812 } 9813 } 9814 9815 bool Redeclaration = false; 9816 bool AddToScope = true; 9817 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 9818 move(TemplateParams), 9819 IsDefinition, 9820 Redeclaration, AddToScope); 9821 if (!ND) return 0; 9822 9823 assert(ND->getDeclContext() == DC); 9824 assert(ND->getLexicalDeclContext() == CurContext); 9825 9826 // Add the function declaration to the appropriate lookup tables, 9827 // adjusting the redeclarations list as necessary. We don't 9828 // want to do this yet if the friending class is dependent. 9829 // 9830 // Also update the scope-based lookup if the target context's 9831 // lookup context is in lexical scope. 9832 if (!CurContext->isDependentContext()) { 9833 DC = DC->getRedeclContext(); 9834 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 9835 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9836 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 9837 } 9838 9839 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 9840 D.getIdentifierLoc(), ND, 9841 DS.getFriendSpecLoc()); 9842 FrD->setAccess(AS_public); 9843 CurContext->addDecl(FrD); 9844 9845 if (ND->isInvalidDecl()) 9846 FrD->setInvalidDecl(); 9847 else { 9848 FunctionDecl *FD; 9849 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 9850 FD = FTD->getTemplatedDecl(); 9851 else 9852 FD = cast<FunctionDecl>(ND); 9853 9854 // Mark templated-scope function declarations as unsupported. 9855 if (FD->getNumTemplateParameterLists()) 9856 FrD->setUnsupportedFriend(true); 9857 } 9858 9859 return ND; 9860} 9861 9862void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 9863 AdjustDeclIfTemplate(Dcl); 9864 9865 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 9866 if (!Fn) { 9867 Diag(DelLoc, diag::err_deleted_non_function); 9868 return; 9869 } 9870 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 9871 Diag(DelLoc, diag::err_deleted_decl_not_first); 9872 Diag(Prev->getLocation(), diag::note_previous_declaration); 9873 // If the declaration wasn't the first, we delete the function anyway for 9874 // recovery. 9875 } 9876 Fn->setDeletedAsWritten(); 9877} 9878 9879void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 9880 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 9881 9882 if (MD) { 9883 if (MD->getParent()->isDependentType()) { 9884 MD->setDefaulted(); 9885 MD->setExplicitlyDefaulted(); 9886 return; 9887 } 9888 9889 CXXSpecialMember Member = getSpecialMember(MD); 9890 if (Member == CXXInvalid) { 9891 Diag(DefaultLoc, diag::err_default_special_members); 9892 return; 9893 } 9894 9895 MD->setDefaulted(); 9896 MD->setExplicitlyDefaulted(); 9897 9898 // If this definition appears within the record, do the checking when 9899 // the record is complete. 9900 const FunctionDecl *Primary = MD; 9901 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 9902 // Find the uninstantiated declaration that actually had the '= default' 9903 // on it. 9904 MD->getTemplateInstantiationPattern()->isDefined(Primary); 9905 9906 if (Primary == Primary->getCanonicalDecl()) 9907 return; 9908 9909 switch (Member) { 9910 case CXXDefaultConstructor: { 9911 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9912 CheckExplicitlyDefaultedDefaultConstructor(CD); 9913 if (!CD->isInvalidDecl()) 9914 DefineImplicitDefaultConstructor(DefaultLoc, CD); 9915 break; 9916 } 9917 9918 case CXXCopyConstructor: { 9919 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9920 CheckExplicitlyDefaultedCopyConstructor(CD); 9921 if (!CD->isInvalidDecl()) 9922 DefineImplicitCopyConstructor(DefaultLoc, CD); 9923 break; 9924 } 9925 9926 case CXXCopyAssignment: { 9927 CheckExplicitlyDefaultedCopyAssignment(MD); 9928 if (!MD->isInvalidDecl()) 9929 DefineImplicitCopyAssignment(DefaultLoc, MD); 9930 break; 9931 } 9932 9933 case CXXDestructor: { 9934 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 9935 CheckExplicitlyDefaultedDestructor(DD); 9936 if (!DD->isInvalidDecl()) 9937 DefineImplicitDestructor(DefaultLoc, DD); 9938 break; 9939 } 9940 9941 case CXXMoveConstructor: { 9942 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9943 CheckExplicitlyDefaultedMoveConstructor(CD); 9944 if (!CD->isInvalidDecl()) 9945 DefineImplicitMoveConstructor(DefaultLoc, CD); 9946 break; 9947 } 9948 9949 case CXXMoveAssignment: { 9950 CheckExplicitlyDefaultedMoveAssignment(MD); 9951 if (!MD->isInvalidDecl()) 9952 DefineImplicitMoveAssignment(DefaultLoc, MD); 9953 break; 9954 } 9955 9956 case CXXInvalid: 9957 assert(false && "Invalid special member."); 9958 break; 9959 } 9960 } else { 9961 Diag(DefaultLoc, diag::err_default_special_members); 9962 } 9963} 9964 9965static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 9966 for (Stmt::child_range CI = S->children(); CI; ++CI) { 9967 Stmt *SubStmt = *CI; 9968 if (!SubStmt) 9969 continue; 9970 if (isa<ReturnStmt>(SubStmt)) 9971 Self.Diag(SubStmt->getSourceRange().getBegin(), 9972 diag::err_return_in_constructor_handler); 9973 if (!isa<Expr>(SubStmt)) 9974 SearchForReturnInStmt(Self, SubStmt); 9975 } 9976} 9977 9978void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 9979 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 9980 CXXCatchStmt *Handler = TryBlock->getHandler(I); 9981 SearchForReturnInStmt(*this, Handler); 9982 } 9983} 9984 9985bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 9986 const CXXMethodDecl *Old) { 9987 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 9988 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 9989 9990 if (Context.hasSameType(NewTy, OldTy) || 9991 NewTy->isDependentType() || OldTy->isDependentType()) 9992 return false; 9993 9994 // Check if the return types are covariant 9995 QualType NewClassTy, OldClassTy; 9996 9997 /// Both types must be pointers or references to classes. 9998 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 9999 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10000 NewClassTy = NewPT->getPointeeType(); 10001 OldClassTy = OldPT->getPointeeType(); 10002 } 10003 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10004 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10005 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10006 NewClassTy = NewRT->getPointeeType(); 10007 OldClassTy = OldRT->getPointeeType(); 10008 } 10009 } 10010 } 10011 10012 // The return types aren't either both pointers or references to a class type. 10013 if (NewClassTy.isNull()) { 10014 Diag(New->getLocation(), 10015 diag::err_different_return_type_for_overriding_virtual_function) 10016 << New->getDeclName() << NewTy << OldTy; 10017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10018 10019 return true; 10020 } 10021 10022 // C++ [class.virtual]p6: 10023 // If the return type of D::f differs from the return type of B::f, the 10024 // class type in the return type of D::f shall be complete at the point of 10025 // declaration of D::f or shall be the class type D. 10026 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10027 if (!RT->isBeingDefined() && 10028 RequireCompleteType(New->getLocation(), NewClassTy, 10029 PDiag(diag::err_covariant_return_incomplete) 10030 << New->getDeclName())) 10031 return true; 10032 } 10033 10034 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10035 // Check if the new class derives from the old class. 10036 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10037 Diag(New->getLocation(), 10038 diag::err_covariant_return_not_derived) 10039 << New->getDeclName() << NewTy << OldTy; 10040 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10041 return true; 10042 } 10043 10044 // Check if we the conversion from derived to base is valid. 10045 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10046 diag::err_covariant_return_inaccessible_base, 10047 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10048 // FIXME: Should this point to the return type? 10049 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10050 // FIXME: this note won't trigger for delayed access control 10051 // diagnostics, and it's impossible to get an undelayed error 10052 // here from access control during the original parse because 10053 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10054 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10055 return true; 10056 } 10057 } 10058 10059 // The qualifiers of the return types must be the same. 10060 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10061 Diag(New->getLocation(), 10062 diag::err_covariant_return_type_different_qualifications) 10063 << New->getDeclName() << NewTy << OldTy; 10064 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10065 return true; 10066 }; 10067 10068 10069 // The new class type must have the same or less qualifiers as the old type. 10070 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10071 Diag(New->getLocation(), 10072 diag::err_covariant_return_type_class_type_more_qualified) 10073 << New->getDeclName() << NewTy << OldTy; 10074 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10075 return true; 10076 }; 10077 10078 return false; 10079} 10080 10081/// \brief Mark the given method pure. 10082/// 10083/// \param Method the method to be marked pure. 10084/// 10085/// \param InitRange the source range that covers the "0" initializer. 10086bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10087 SourceLocation EndLoc = InitRange.getEnd(); 10088 if (EndLoc.isValid()) 10089 Method->setRangeEnd(EndLoc); 10090 10091 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10092 Method->setPure(); 10093 return false; 10094 } 10095 10096 if (!Method->isInvalidDecl()) 10097 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10098 << Method->getDeclName() << InitRange; 10099 return true; 10100} 10101 10102/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10103/// an initializer for the out-of-line declaration 'Dcl'. The scope 10104/// is a fresh scope pushed for just this purpose. 10105/// 10106/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10107/// static data member of class X, names should be looked up in the scope of 10108/// class X. 10109void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10110 // If there is no declaration, there was an error parsing it. 10111 if (D == 0 || D->isInvalidDecl()) return; 10112 10113 // We should only get called for declarations with scope specifiers, like: 10114 // int foo::bar; 10115 assert(D->isOutOfLine()); 10116 EnterDeclaratorContext(S, D->getDeclContext()); 10117} 10118 10119/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10120/// initializer for the out-of-line declaration 'D'. 10121void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10122 // If there is no declaration, there was an error parsing it. 10123 if (D == 0 || D->isInvalidDecl()) return; 10124 10125 assert(D->isOutOfLine()); 10126 ExitDeclaratorContext(S); 10127} 10128 10129/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10130/// C++ if/switch/while/for statement. 10131/// e.g: "if (int x = f()) {...}" 10132DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10133 // C++ 6.4p2: 10134 // The declarator shall not specify a function or an array. 10135 // The type-specifier-seq shall not contain typedef and shall not declare a 10136 // new class or enumeration. 10137 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10138 "Parser allowed 'typedef' as storage class of condition decl."); 10139 10140 Decl *Dcl = ActOnDeclarator(S, D); 10141 if (!Dcl) 10142 return true; 10143 10144 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10145 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10146 << D.getSourceRange(); 10147 return true; 10148 } 10149 10150 return Dcl; 10151} 10152 10153void Sema::LoadExternalVTableUses() { 10154 if (!ExternalSource) 10155 return; 10156 10157 SmallVector<ExternalVTableUse, 4> VTables; 10158 ExternalSource->ReadUsedVTables(VTables); 10159 SmallVector<VTableUse, 4> NewUses; 10160 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10161 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10162 = VTablesUsed.find(VTables[I].Record); 10163 // Even if a definition wasn't required before, it may be required now. 10164 if (Pos != VTablesUsed.end()) { 10165 if (!Pos->second && VTables[I].DefinitionRequired) 10166 Pos->second = true; 10167 continue; 10168 } 10169 10170 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10171 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10172 } 10173 10174 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10175} 10176 10177void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10178 bool DefinitionRequired) { 10179 // Ignore any vtable uses in unevaluated operands or for classes that do 10180 // not have a vtable. 10181 if (!Class->isDynamicClass() || Class->isDependentContext() || 10182 CurContext->isDependentContext() || 10183 ExprEvalContexts.back().Context == Unevaluated) 10184 return; 10185 10186 // Try to insert this class into the map. 10187 LoadExternalVTableUses(); 10188 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10189 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10190 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10191 if (!Pos.second) { 10192 // If we already had an entry, check to see if we are promoting this vtable 10193 // to required a definition. If so, we need to reappend to the VTableUses 10194 // list, since we may have already processed the first entry. 10195 if (DefinitionRequired && !Pos.first->second) { 10196 Pos.first->second = true; 10197 } else { 10198 // Otherwise, we can early exit. 10199 return; 10200 } 10201 } 10202 10203 // Local classes need to have their virtual members marked 10204 // immediately. For all other classes, we mark their virtual members 10205 // at the end of the translation unit. 10206 if (Class->isLocalClass()) 10207 MarkVirtualMembersReferenced(Loc, Class); 10208 else 10209 VTableUses.push_back(std::make_pair(Class, Loc)); 10210} 10211 10212bool Sema::DefineUsedVTables() { 10213 LoadExternalVTableUses(); 10214 if (VTableUses.empty()) 10215 return false; 10216 10217 // Note: The VTableUses vector could grow as a result of marking 10218 // the members of a class as "used", so we check the size each 10219 // time through the loop and prefer indices (with are stable) to 10220 // iterators (which are not). 10221 bool DefinedAnything = false; 10222 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10223 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10224 if (!Class) 10225 continue; 10226 10227 SourceLocation Loc = VTableUses[I].second; 10228 10229 // If this class has a key function, but that key function is 10230 // defined in another translation unit, we don't need to emit the 10231 // vtable even though we're using it. 10232 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10233 if (KeyFunction && !KeyFunction->hasBody()) { 10234 switch (KeyFunction->getTemplateSpecializationKind()) { 10235 case TSK_Undeclared: 10236 case TSK_ExplicitSpecialization: 10237 case TSK_ExplicitInstantiationDeclaration: 10238 // The key function is in another translation unit. 10239 continue; 10240 10241 case TSK_ExplicitInstantiationDefinition: 10242 case TSK_ImplicitInstantiation: 10243 // We will be instantiating the key function. 10244 break; 10245 } 10246 } else if (!KeyFunction) { 10247 // If we have a class with no key function that is the subject 10248 // of an explicit instantiation declaration, suppress the 10249 // vtable; it will live with the explicit instantiation 10250 // definition. 10251 bool IsExplicitInstantiationDeclaration 10252 = Class->getTemplateSpecializationKind() 10253 == TSK_ExplicitInstantiationDeclaration; 10254 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10255 REnd = Class->redecls_end(); 10256 R != REnd; ++R) { 10257 TemplateSpecializationKind TSK 10258 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10259 if (TSK == TSK_ExplicitInstantiationDeclaration) 10260 IsExplicitInstantiationDeclaration = true; 10261 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10262 IsExplicitInstantiationDeclaration = false; 10263 break; 10264 } 10265 } 10266 10267 if (IsExplicitInstantiationDeclaration) 10268 continue; 10269 } 10270 10271 // Mark all of the virtual members of this class as referenced, so 10272 // that we can build a vtable. Then, tell the AST consumer that a 10273 // vtable for this class is required. 10274 DefinedAnything = true; 10275 MarkVirtualMembersReferenced(Loc, Class); 10276 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10277 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10278 10279 // Optionally warn if we're emitting a weak vtable. 10280 if (Class->getLinkage() == ExternalLinkage && 10281 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10282 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 10283 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10284 } 10285 } 10286 VTableUses.clear(); 10287 10288 return DefinedAnything; 10289} 10290 10291void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10292 const CXXRecordDecl *RD) { 10293 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10294 e = RD->method_end(); i != e; ++i) { 10295 CXXMethodDecl *MD = *i; 10296 10297 // C++ [basic.def.odr]p2: 10298 // [...] A virtual member function is used if it is not pure. [...] 10299 if (MD->isVirtual() && !MD->isPure()) 10300 MarkDeclarationReferenced(Loc, MD); 10301 } 10302 10303 // Only classes that have virtual bases need a VTT. 10304 if (RD->getNumVBases() == 0) 10305 return; 10306 10307 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10308 e = RD->bases_end(); i != e; ++i) { 10309 const CXXRecordDecl *Base = 10310 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10311 if (Base->getNumVBases() == 0) 10312 continue; 10313 MarkVirtualMembersReferenced(Loc, Base); 10314 } 10315} 10316 10317/// SetIvarInitializers - This routine builds initialization ASTs for the 10318/// Objective-C implementation whose ivars need be initialized. 10319void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10320 if (!getLangOptions().CPlusPlus) 10321 return; 10322 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10323 SmallVector<ObjCIvarDecl*, 8> ivars; 10324 CollectIvarsToConstructOrDestruct(OID, ivars); 10325 if (ivars.empty()) 10326 return; 10327 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10328 for (unsigned i = 0; i < ivars.size(); i++) { 10329 FieldDecl *Field = ivars[i]; 10330 if (Field->isInvalidDecl()) 10331 continue; 10332 10333 CXXCtorInitializer *Member; 10334 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10335 InitializationKind InitKind = 10336 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10337 10338 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10339 ExprResult MemberInit = 10340 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10341 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10342 // Note, MemberInit could actually come back empty if no initialization 10343 // is required (e.g., because it would call a trivial default constructor) 10344 if (!MemberInit.get() || MemberInit.isInvalid()) 10345 continue; 10346 10347 Member = 10348 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10349 SourceLocation(), 10350 MemberInit.takeAs<Expr>(), 10351 SourceLocation()); 10352 AllToInit.push_back(Member); 10353 10354 // Be sure that the destructor is accessible and is marked as referenced. 10355 if (const RecordType *RecordTy 10356 = Context.getBaseElementType(Field->getType()) 10357 ->getAs<RecordType>()) { 10358 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10359 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10360 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10361 CheckDestructorAccess(Field->getLocation(), Destructor, 10362 PDiag(diag::err_access_dtor_ivar) 10363 << Context.getBaseElementType(Field->getType())); 10364 } 10365 } 10366 } 10367 ObjCImplementation->setIvarInitializers(Context, 10368 AllToInit.data(), AllToInit.size()); 10369 } 10370} 10371 10372static 10373void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10374 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10375 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10376 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10377 Sema &S) { 10378 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10379 CE = Current.end(); 10380 if (Ctor->isInvalidDecl()) 10381 return; 10382 10383 const FunctionDecl *FNTarget = 0; 10384 CXXConstructorDecl *Target; 10385 10386 // We ignore the result here since if we don't have a body, Target will be 10387 // null below. 10388 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10389 Target 10390= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10391 10392 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10393 // Avoid dereferencing a null pointer here. 10394 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10395 10396 if (!Current.insert(Canonical)) 10397 return; 10398 10399 // We know that beyond here, we aren't chaining into a cycle. 10400 if (!Target || !Target->isDelegatingConstructor() || 10401 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10402 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10403 Valid.insert(*CI); 10404 Current.clear(); 10405 // We've hit a cycle. 10406 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10407 Current.count(TCanonical)) { 10408 // If we haven't diagnosed this cycle yet, do so now. 10409 if (!Invalid.count(TCanonical)) { 10410 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10411 diag::warn_delegating_ctor_cycle) 10412 << Ctor; 10413 10414 // Don't add a note for a function delegating directo to itself. 10415 if (TCanonical != Canonical) 10416 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10417 10418 CXXConstructorDecl *C = Target; 10419 while (C->getCanonicalDecl() != Canonical) { 10420 (void)C->getTargetConstructor()->hasBody(FNTarget); 10421 assert(FNTarget && "Ctor cycle through bodiless function"); 10422 10423 C 10424 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10425 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10426 } 10427 } 10428 10429 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10430 Invalid.insert(*CI); 10431 Current.clear(); 10432 } else { 10433 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10434 } 10435} 10436 10437 10438void Sema::CheckDelegatingCtorCycles() { 10439 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10440 10441 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10442 CE = Current.end(); 10443 10444 for (DelegatingCtorDeclsType::iterator 10445 I = DelegatingCtorDecls.begin(ExternalSource), 10446 E = DelegatingCtorDecls.end(); 10447 I != E; ++I) { 10448 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10449 } 10450 10451 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10452 (*CI)->setInvalidDecl(); 10453} 10454