SemaDeclCXX.cpp revision 0216df8fd3ce58f5a68ef2ab141ea34c96c11164
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 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer. 1749MemInitResult 1750Sema::BuildMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 SourceLocation IdLoc, 1756 const MultiInitializer &Args, 1757 SourceLocation EllipsisLoc) { 1758 if (!ConstructorD) 1759 return true; 1760 1761 AdjustDeclIfTemplate(ConstructorD); 1762 1763 CXXConstructorDecl *Constructor 1764 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1765 if (!Constructor) { 1766 // The user wrote a constructor initializer on a function that is 1767 // not a C++ constructor. Ignore the error for now, because we may 1768 // have more member initializers coming; we'll diagnose it just 1769 // once in ActOnMemInitializers. 1770 return true; 1771 } 1772 1773 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1774 1775 // C++ [class.base.init]p2: 1776 // Names in a mem-initializer-id are looked up in the scope of the 1777 // constructor's class and, if not found in that scope, are looked 1778 // up in the scope containing the constructor's definition. 1779 // [Note: if the constructor's class contains a member with the 1780 // same name as a direct or virtual base class of the class, a 1781 // mem-initializer-id naming the member or base class and composed 1782 // of a single identifier refers to the class member. A 1783 // mem-initializer-id for the hidden base class may be specified 1784 // using a qualified name. ] 1785 if (!SS.getScopeRep() && !TemplateTypeTy) { 1786 // Look for a member, first. 1787 DeclContext::lookup_result Result 1788 = ClassDecl->lookup(MemberOrBase); 1789 if (Result.first != Result.second) { 1790 ValueDecl *Member; 1791 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1792 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1793 if (EllipsisLoc.isValid()) 1794 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1795 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1796 1797 return BuildMemberInitializer(Member, Args, IdLoc); 1798 } 1799 } 1800 } 1801 // It didn't name a member, so see if it names a class. 1802 QualType BaseType; 1803 TypeSourceInfo *TInfo = 0; 1804 1805 if (TemplateTypeTy) { 1806 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1807 } else { 1808 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1809 LookupParsedName(R, S, &SS); 1810 1811 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1812 if (!TyD) { 1813 if (R.isAmbiguous()) return true; 1814 1815 // We don't want access-control diagnostics here. 1816 R.suppressDiagnostics(); 1817 1818 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1819 bool NotUnknownSpecialization = false; 1820 DeclContext *DC = computeDeclContext(SS, false); 1821 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1822 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1823 1824 if (!NotUnknownSpecialization) { 1825 // When the scope specifier can refer to a member of an unknown 1826 // specialization, we take it as a type name. 1827 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1828 SS.getWithLocInContext(Context), 1829 *MemberOrBase, IdLoc); 1830 if (BaseType.isNull()) 1831 return true; 1832 1833 R.clear(); 1834 R.setLookupName(MemberOrBase); 1835 } 1836 } 1837 1838 // If no results were found, try to correct typos. 1839 TypoCorrection Corr; 1840 if (R.empty() && BaseType.isNull() && 1841 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1842 ClassDecl, false, CTC_NoKeywords))) { 1843 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1844 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1845 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1846 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1847 // We have found a non-static data member with a similar 1848 // name to what was typed; complain and initialize that 1849 // member. 1850 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1851 << MemberOrBase << true << CorrectedQuotedStr 1852 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1853 Diag(Member->getLocation(), diag::note_previous_decl) 1854 << CorrectedQuotedStr; 1855 1856 return BuildMemberInitializer(Member, Args, IdLoc); 1857 } 1858 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1859 const CXXBaseSpecifier *DirectBaseSpec; 1860 const CXXBaseSpecifier *VirtualBaseSpec; 1861 if (FindBaseInitializer(*this, ClassDecl, 1862 Context.getTypeDeclType(Type), 1863 DirectBaseSpec, VirtualBaseSpec)) { 1864 // We have found a direct or virtual base class with a 1865 // similar name to what was typed; complain and initialize 1866 // that base class. 1867 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1868 << MemberOrBase << false << CorrectedQuotedStr 1869 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1870 1871 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1872 : VirtualBaseSpec; 1873 Diag(BaseSpec->getSourceRange().getBegin(), 1874 diag::note_base_class_specified_here) 1875 << BaseSpec->getType() 1876 << BaseSpec->getSourceRange(); 1877 1878 TyD = Type; 1879 } 1880 } 1881 } 1882 1883 if (!TyD && BaseType.isNull()) { 1884 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1885 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1886 return true; 1887 } 1888 } 1889 1890 if (BaseType.isNull()) { 1891 BaseType = Context.getTypeDeclType(TyD); 1892 if (SS.isSet()) { 1893 NestedNameSpecifier *Qualifier = 1894 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1895 1896 // FIXME: preserve source range information 1897 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1898 } 1899 } 1900 } 1901 1902 if (!TInfo) 1903 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1904 1905 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1906} 1907 1908/// Checks a member initializer expression for cases where reference (or 1909/// pointer) members are bound to by-value parameters (or their addresses). 1910static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1911 Expr *Init, 1912 SourceLocation IdLoc) { 1913 QualType MemberTy = Member->getType(); 1914 1915 // We only handle pointers and references currently. 1916 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1917 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1918 return; 1919 1920 const bool IsPointer = MemberTy->isPointerType(); 1921 if (IsPointer) { 1922 if (const UnaryOperator *Op 1923 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1924 // The only case we're worried about with pointers requires taking the 1925 // address. 1926 if (Op->getOpcode() != UO_AddrOf) 1927 return; 1928 1929 Init = Op->getSubExpr(); 1930 } else { 1931 // We only handle address-of expression initializers for pointers. 1932 return; 1933 } 1934 } 1935 1936 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1937 // Taking the address of a temporary will be diagnosed as a hard error. 1938 if (IsPointer) 1939 return; 1940 1941 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1942 << Member << Init->getSourceRange(); 1943 } else if (const DeclRefExpr *DRE 1944 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1945 // We only warn when referring to a non-reference parameter declaration. 1946 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1947 if (!Parameter || Parameter->getType()->isReferenceType()) 1948 return; 1949 1950 S.Diag(Init->getExprLoc(), 1951 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1952 : diag::warn_bind_ref_member_to_parameter) 1953 << Member << Parameter << Init->getSourceRange(); 1954 } else { 1955 // Other initializers are fine. 1956 return; 1957 } 1958 1959 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1960 << (unsigned)IsPointer; 1961} 1962 1963/// Checks an initializer expression for use of uninitialized fields, such as 1964/// containing the field that is being initialized. Returns true if there is an 1965/// uninitialized field was used an updates the SourceLocation parameter; false 1966/// otherwise. 1967static bool InitExprContainsUninitializedFields(const Stmt *S, 1968 const ValueDecl *LhsField, 1969 SourceLocation *L) { 1970 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1971 1972 if (isa<CallExpr>(S)) { 1973 // Do not descend into function calls or constructors, as the use 1974 // of an uninitialized field may be valid. One would have to inspect 1975 // the contents of the function/ctor to determine if it is safe or not. 1976 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1977 // may be safe, depending on what the function/ctor does. 1978 return false; 1979 } 1980 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1981 const NamedDecl *RhsField = ME->getMemberDecl(); 1982 1983 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1984 // The member expression points to a static data member. 1985 assert(VD->isStaticDataMember() && 1986 "Member points to non-static data member!"); 1987 (void)VD; 1988 return false; 1989 } 1990 1991 if (isa<EnumConstantDecl>(RhsField)) { 1992 // The member expression points to an enum. 1993 return false; 1994 } 1995 1996 if (RhsField == LhsField) { 1997 // Initializing a field with itself. Throw a warning. 1998 // But wait; there are exceptions! 1999 // Exception #1: The field may not belong to this record. 2000 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2001 const Expr *base = ME->getBase(); 2002 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2003 // Even though the field matches, it does not belong to this record. 2004 return false; 2005 } 2006 // None of the exceptions triggered; return true to indicate an 2007 // uninitialized field was used. 2008 *L = ME->getMemberLoc(); 2009 return true; 2010 } 2011 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2012 // sizeof/alignof doesn't reference contents, do not warn. 2013 return false; 2014 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2015 // address-of doesn't reference contents (the pointer may be dereferenced 2016 // in the same expression but it would be rare; and weird). 2017 if (UOE->getOpcode() == UO_AddrOf) 2018 return false; 2019 } 2020 for (Stmt::const_child_range it = S->children(); it; ++it) { 2021 if (!*it) { 2022 // An expression such as 'member(arg ?: "")' may trigger this. 2023 continue; 2024 } 2025 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2026 return true; 2027 } 2028 return false; 2029} 2030 2031MemInitResult 2032Sema::BuildMemberInitializer(ValueDecl *Member, 2033 const MultiInitializer &Args, 2034 SourceLocation IdLoc) { 2035 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2036 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2037 assert((DirectMember || IndirectMember) && 2038 "Member must be a FieldDecl or IndirectFieldDecl"); 2039 2040 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2041 return true; 2042 2043 if (Member->isInvalidDecl()) 2044 return true; 2045 2046 // Diagnose value-uses of fields to initialize themselves, e.g. 2047 // foo(foo) 2048 // where foo is not also a parameter to the constructor. 2049 // TODO: implement -Wuninitialized and fold this into that framework. 2050 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2051 I != E; ++I) { 2052 SourceLocation L; 2053 Expr *Arg = *I; 2054 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2055 Arg = DIE->getInit(); 2056 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2057 // FIXME: Return true in the case when other fields are used before being 2058 // uninitialized. For example, let this field be the i'th field. When 2059 // initializing the i'th field, throw a warning if any of the >= i'th 2060 // fields are used, as they are not yet initialized. 2061 // Right now we are only handling the case where the i'th field uses 2062 // itself in its initializer. 2063 Diag(L, diag::warn_field_is_uninit); 2064 } 2065 } 2066 2067 bool HasDependentArg = Args.isTypeDependent(); 2068 2069 Expr *Init; 2070 if (Member->getType()->isDependentType() || HasDependentArg) { 2071 // Can't check initialization for a member of dependent type or when 2072 // any of the arguments are type-dependent expressions. 2073 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2074 2075 DiscardCleanupsInEvaluationContext(); 2076 } else { 2077 // Initialize the member. 2078 InitializedEntity MemberEntity = 2079 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2080 : InitializedEntity::InitializeMember(IndirectMember, 0); 2081 InitializationKind Kind = 2082 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2083 Args.getEndLoc()); 2084 2085 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2086 if (MemberInit.isInvalid()) 2087 return true; 2088 2089 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2090 2091 // C++0x [class.base.init]p7: 2092 // The initialization of each base and member constitutes a 2093 // full-expression. 2094 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2095 if (MemberInit.isInvalid()) 2096 return true; 2097 2098 // If we are in a dependent context, template instantiation will 2099 // perform this type-checking again. Just save the arguments that we 2100 // received in a ParenListExpr. 2101 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2102 // of the information that we have about the member 2103 // initializer. However, deconstructing the ASTs is a dicey process, 2104 // and this approach is far more likely to get the corner cases right. 2105 if (CurContext->isDependentContext()) { 2106 Init = Args.CreateInitExpr(Context, 2107 Member->getType().getNonReferenceType()); 2108 } else { 2109 Init = MemberInit.get(); 2110 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2111 } 2112 } 2113 2114 if (DirectMember) { 2115 return new (Context) CXXCtorInitializer(Context, DirectMember, 2116 IdLoc, Args.getStartLoc(), 2117 Init, Args.getEndLoc()); 2118 } else { 2119 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } 2123} 2124 2125MemInitResult 2126Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2127 const MultiInitializer &Args, 2128 SourceLocation NameLoc, 2129 CXXRecordDecl *ClassDecl) { 2130 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2131 if (!LangOpts.CPlusPlus0x) 2132 return Diag(Loc, diag::err_delegating_ctor) 2133 << TInfo->getTypeLoc().getLocalSourceRange(); 2134 Diag(Loc, diag::warn_cxx98_compat_delegating_ctor); 2135 2136 // Initialize the object. 2137 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2138 QualType(ClassDecl->getTypeForDecl(), 0)); 2139 InitializationKind Kind = 2140 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2141 Args.getEndLoc()); 2142 2143 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2144 if (DelegationInit.isInvalid()) 2145 return true; 2146 2147 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2148 CXXConstructorDecl *Constructor 2149 = ConExpr->getConstructor(); 2150 assert(Constructor && "Delegating constructor with no target?"); 2151 2152 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2153 2154 // C++0x [class.base.init]p7: 2155 // The initialization of each base and member constitutes a 2156 // full-expression. 2157 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2158 if (DelegationInit.isInvalid()) 2159 return true; 2160 2161 assert(!CurContext->isDependentContext()); 2162 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2163 Constructor, 2164 DelegationInit.takeAs<Expr>(), 2165 Args.getEndLoc()); 2166} 2167 2168MemInitResult 2169Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2170 const MultiInitializer &Args, 2171 CXXRecordDecl *ClassDecl, 2172 SourceLocation EllipsisLoc) { 2173 bool HasDependentArg = Args.isTypeDependent(); 2174 2175 SourceLocation BaseLoc 2176 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2177 2178 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2179 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2180 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2181 2182 // C++ [class.base.init]p2: 2183 // [...] Unless the mem-initializer-id names a nonstatic data 2184 // member of the constructor's class or a direct or virtual base 2185 // of that class, the mem-initializer is ill-formed. A 2186 // mem-initializer-list can initialize a base class using any 2187 // name that denotes that base class type. 2188 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2189 2190 if (EllipsisLoc.isValid()) { 2191 // This is a pack expansion. 2192 if (!BaseType->containsUnexpandedParameterPack()) { 2193 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2194 << SourceRange(BaseLoc, Args.getEndLoc()); 2195 2196 EllipsisLoc = SourceLocation(); 2197 } 2198 } else { 2199 // Check for any unexpanded parameter packs. 2200 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2201 return true; 2202 2203 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2204 return true; 2205 } 2206 2207 // Check for direct and virtual base classes. 2208 const CXXBaseSpecifier *DirectBaseSpec = 0; 2209 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2210 if (!Dependent) { 2211 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2212 BaseType)) 2213 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2214 2215 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2216 VirtualBaseSpec); 2217 2218 // C++ [base.class.init]p2: 2219 // Unless the mem-initializer-id names a nonstatic data member of the 2220 // constructor's class or a direct or virtual base of that class, the 2221 // mem-initializer is ill-formed. 2222 if (!DirectBaseSpec && !VirtualBaseSpec) { 2223 // If the class has any dependent bases, then it's possible that 2224 // one of those types will resolve to the same type as 2225 // BaseType. Therefore, just treat this as a dependent base 2226 // class initialization. FIXME: Should we try to check the 2227 // initialization anyway? It seems odd. 2228 if (ClassDecl->hasAnyDependentBases()) 2229 Dependent = true; 2230 else 2231 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2232 << BaseType << Context.getTypeDeclType(ClassDecl) 2233 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2234 } 2235 } 2236 2237 if (Dependent) { 2238 // Can't check initialization for a base of dependent type or when 2239 // any of the arguments are type-dependent expressions. 2240 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2241 2242 DiscardCleanupsInEvaluationContext(); 2243 2244 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2245 /*IsVirtual=*/false, 2246 Args.getStartLoc(), BaseInit, 2247 Args.getEndLoc(), EllipsisLoc); 2248 } 2249 2250 // C++ [base.class.init]p2: 2251 // If a mem-initializer-id is ambiguous because it designates both 2252 // a direct non-virtual base class and an inherited virtual base 2253 // class, the mem-initializer is ill-formed. 2254 if (DirectBaseSpec && VirtualBaseSpec) 2255 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2256 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2257 2258 CXXBaseSpecifier *BaseSpec 2259 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2260 if (!BaseSpec) 2261 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2262 2263 // Initialize the base. 2264 InitializedEntity BaseEntity = 2265 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2266 InitializationKind Kind = 2267 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2268 Args.getEndLoc()); 2269 2270 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2271 if (BaseInit.isInvalid()) 2272 return true; 2273 2274 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2275 2276 // C++0x [class.base.init]p7: 2277 // The initialization of each base and member constitutes a 2278 // full-expression. 2279 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2280 if (BaseInit.isInvalid()) 2281 return true; 2282 2283 // If we are in a dependent context, template instantiation will 2284 // perform this type-checking again. Just save the arguments that we 2285 // received in a ParenListExpr. 2286 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2287 // of the information that we have about the base 2288 // initializer. However, deconstructing the ASTs is a dicey process, 2289 // and this approach is far more likely to get the corner cases right. 2290 if (CurContext->isDependentContext()) 2291 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2292 2293 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2294 BaseSpec->isVirtual(), 2295 Args.getStartLoc(), 2296 BaseInit.takeAs<Expr>(), 2297 Args.getEndLoc(), EllipsisLoc); 2298} 2299 2300// Create a static_cast\<T&&>(expr). 2301static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2302 QualType ExprType = E->getType(); 2303 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2304 SourceLocation ExprLoc = E->getLocStart(); 2305 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2306 TargetType, ExprLoc); 2307 2308 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2309 SourceRange(ExprLoc, ExprLoc), 2310 E->getSourceRange()).take(); 2311} 2312 2313/// ImplicitInitializerKind - How an implicit base or member initializer should 2314/// initialize its base or member. 2315enum ImplicitInitializerKind { 2316 IIK_Default, 2317 IIK_Copy, 2318 IIK_Move 2319}; 2320 2321static bool 2322BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2323 ImplicitInitializerKind ImplicitInitKind, 2324 CXXBaseSpecifier *BaseSpec, 2325 bool IsInheritedVirtualBase, 2326 CXXCtorInitializer *&CXXBaseInit) { 2327 InitializedEntity InitEntity 2328 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2329 IsInheritedVirtualBase); 2330 2331 ExprResult BaseInit; 2332 2333 switch (ImplicitInitKind) { 2334 case IIK_Default: { 2335 InitializationKind InitKind 2336 = InitializationKind::CreateDefault(Constructor->getLocation()); 2337 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2338 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2339 MultiExprArg(SemaRef, 0, 0)); 2340 break; 2341 } 2342 2343 case IIK_Move: 2344 case IIK_Copy: { 2345 bool Moving = ImplicitInitKind == IIK_Move; 2346 ParmVarDecl *Param = Constructor->getParamDecl(0); 2347 QualType ParamType = Param->getType().getNonReferenceType(); 2348 2349 Expr *CopyCtorArg = 2350 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2351 Constructor->getLocation(), ParamType, 2352 VK_LValue, 0); 2353 2354 // Cast to the base class to avoid ambiguities. 2355 QualType ArgTy = 2356 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2357 ParamType.getQualifiers()); 2358 2359 if (Moving) { 2360 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2361 } 2362 2363 CXXCastPath BasePath; 2364 BasePath.push_back(BaseSpec); 2365 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2366 CK_UncheckedDerivedToBase, 2367 Moving ? VK_XValue : VK_LValue, 2368 &BasePath).take(); 2369 2370 InitializationKind InitKind 2371 = InitializationKind::CreateDirect(Constructor->getLocation(), 2372 SourceLocation(), SourceLocation()); 2373 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2374 &CopyCtorArg, 1); 2375 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2376 MultiExprArg(&CopyCtorArg, 1)); 2377 break; 2378 } 2379 } 2380 2381 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2382 if (BaseInit.isInvalid()) 2383 return true; 2384 2385 CXXBaseInit = 2386 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2387 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2388 SourceLocation()), 2389 BaseSpec->isVirtual(), 2390 SourceLocation(), 2391 BaseInit.takeAs<Expr>(), 2392 SourceLocation(), 2393 SourceLocation()); 2394 2395 return false; 2396} 2397 2398static bool RefersToRValueRef(Expr *MemRef) { 2399 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2400 return Referenced->getType()->isRValueReferenceType(); 2401} 2402 2403static bool 2404BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2405 ImplicitInitializerKind ImplicitInitKind, 2406 FieldDecl *Field, IndirectFieldDecl *Indirect, 2407 CXXCtorInitializer *&CXXMemberInit) { 2408 if (Field->isInvalidDecl()) 2409 return true; 2410 2411 SourceLocation Loc = Constructor->getLocation(); 2412 2413 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2414 bool Moving = ImplicitInitKind == IIK_Move; 2415 ParmVarDecl *Param = Constructor->getParamDecl(0); 2416 QualType ParamType = Param->getType().getNonReferenceType(); 2417 2418 // Suppress copying zero-width bitfields. 2419 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2420 return false; 2421 2422 Expr *MemberExprBase = 2423 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2424 Loc, ParamType, VK_LValue, 0); 2425 2426 if (Moving) { 2427 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2428 } 2429 2430 // Build a reference to this field within the parameter. 2431 CXXScopeSpec SS; 2432 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2433 Sema::LookupMemberName); 2434 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2435 : cast<ValueDecl>(Field), AS_public); 2436 MemberLookup.resolveKind(); 2437 ExprResult CtorArg 2438 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2439 ParamType, Loc, 2440 /*IsArrow=*/false, 2441 SS, 2442 /*FirstQualifierInScope=*/0, 2443 MemberLookup, 2444 /*TemplateArgs=*/0); 2445 if (CtorArg.isInvalid()) 2446 return true; 2447 2448 // C++11 [class.copy]p15: 2449 // - if a member m has rvalue reference type T&&, it is direct-initialized 2450 // with static_cast<T&&>(x.m); 2451 if (RefersToRValueRef(CtorArg.get())) { 2452 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2453 } 2454 2455 // When the field we are copying is an array, create index variables for 2456 // each dimension of the array. We use these index variables to subscript 2457 // the source array, and other clients (e.g., CodeGen) will perform the 2458 // necessary iteration with these index variables. 2459 SmallVector<VarDecl *, 4> IndexVariables; 2460 QualType BaseType = Field->getType(); 2461 QualType SizeType = SemaRef.Context.getSizeType(); 2462 bool InitializingArray = false; 2463 while (const ConstantArrayType *Array 2464 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2465 InitializingArray = true; 2466 // Create the iteration variable for this array index. 2467 IdentifierInfo *IterationVarName = 0; 2468 { 2469 llvm::SmallString<8> Str; 2470 llvm::raw_svector_ostream OS(Str); 2471 OS << "__i" << IndexVariables.size(); 2472 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2473 } 2474 VarDecl *IterationVar 2475 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2476 IterationVarName, SizeType, 2477 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2478 SC_None, SC_None); 2479 IndexVariables.push_back(IterationVar); 2480 2481 // Create a reference to the iteration variable. 2482 ExprResult IterationVarRef 2483 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2484 assert(!IterationVarRef.isInvalid() && 2485 "Reference to invented variable cannot fail!"); 2486 2487 // Subscript the array with this iteration variable. 2488 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2489 IterationVarRef.take(), 2490 Loc); 2491 if (CtorArg.isInvalid()) 2492 return true; 2493 2494 BaseType = Array->getElementType(); 2495 } 2496 2497 // The array subscript expression is an lvalue, which is wrong for moving. 2498 if (Moving && InitializingArray) 2499 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2500 2501 // Construct the entity that we will be initializing. For an array, this 2502 // will be first element in the array, which may require several levels 2503 // of array-subscript entities. 2504 SmallVector<InitializedEntity, 4> Entities; 2505 Entities.reserve(1 + IndexVariables.size()); 2506 if (Indirect) 2507 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2508 else 2509 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2510 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2511 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2512 0, 2513 Entities.back())); 2514 2515 // Direct-initialize to use the copy constructor. 2516 InitializationKind InitKind = 2517 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2518 2519 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2520 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2521 &CtorArgE, 1); 2522 2523 ExprResult MemberInit 2524 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2525 MultiExprArg(&CtorArgE, 1)); 2526 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2527 if (MemberInit.isInvalid()) 2528 return true; 2529 2530 if (Indirect) { 2531 assert(IndexVariables.size() == 0 && 2532 "Indirect field improperly initialized"); 2533 CXXMemberInit 2534 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2535 Loc, Loc, 2536 MemberInit.takeAs<Expr>(), 2537 Loc); 2538 } else 2539 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2540 Loc, MemberInit.takeAs<Expr>(), 2541 Loc, 2542 IndexVariables.data(), 2543 IndexVariables.size()); 2544 return false; 2545 } 2546 2547 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2548 2549 QualType FieldBaseElementType = 2550 SemaRef.Context.getBaseElementType(Field->getType()); 2551 2552 if (FieldBaseElementType->isRecordType()) { 2553 InitializedEntity InitEntity 2554 = Indirect? InitializedEntity::InitializeMember(Indirect) 2555 : InitializedEntity::InitializeMember(Field); 2556 InitializationKind InitKind = 2557 InitializationKind::CreateDefault(Loc); 2558 2559 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2560 ExprResult MemberInit = 2561 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2562 2563 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2564 if (MemberInit.isInvalid()) 2565 return true; 2566 2567 if (Indirect) 2568 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2569 Indirect, Loc, 2570 Loc, 2571 MemberInit.get(), 2572 Loc); 2573 else 2574 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2575 Field, Loc, Loc, 2576 MemberInit.get(), 2577 Loc); 2578 return false; 2579 } 2580 2581 if (!Field->getParent()->isUnion()) { 2582 if (FieldBaseElementType->isReferenceType()) { 2583 SemaRef.Diag(Constructor->getLocation(), 2584 diag::err_uninitialized_member_in_ctor) 2585 << (int)Constructor->isImplicit() 2586 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2587 << 0 << Field->getDeclName(); 2588 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2589 return true; 2590 } 2591 2592 if (FieldBaseElementType.isConstQualified()) { 2593 SemaRef.Diag(Constructor->getLocation(), 2594 diag::err_uninitialized_member_in_ctor) 2595 << (int)Constructor->isImplicit() 2596 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2597 << 1 << Field->getDeclName(); 2598 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2599 return true; 2600 } 2601 } 2602 2603 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2604 FieldBaseElementType->isObjCRetainableType() && 2605 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2606 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2607 // Instant objects: 2608 // Default-initialize Objective-C pointers to NULL. 2609 CXXMemberInit 2610 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2611 Loc, Loc, 2612 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2613 Loc); 2614 return false; 2615 } 2616 2617 // Nothing to initialize. 2618 CXXMemberInit = 0; 2619 return false; 2620} 2621 2622namespace { 2623struct BaseAndFieldInfo { 2624 Sema &S; 2625 CXXConstructorDecl *Ctor; 2626 bool AnyErrorsInInits; 2627 ImplicitInitializerKind IIK; 2628 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2629 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2630 2631 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2632 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2633 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2634 if (Generated && Ctor->isCopyConstructor()) 2635 IIK = IIK_Copy; 2636 else if (Generated && Ctor->isMoveConstructor()) 2637 IIK = IIK_Move; 2638 else 2639 IIK = IIK_Default; 2640 } 2641}; 2642} 2643 2644/// \brief Determine whether the given indirect field declaration is somewhere 2645/// within an anonymous union. 2646static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2647 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2648 CEnd = F->chain_end(); 2649 C != CEnd; ++C) 2650 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2651 if (Record->isUnion()) 2652 return true; 2653 2654 return false; 2655} 2656 2657static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2658 FieldDecl *Field, 2659 IndirectFieldDecl *Indirect = 0) { 2660 2661 // Overwhelmingly common case: we have a direct initializer for this field. 2662 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2663 Info.AllToInit.push_back(Init); 2664 return false; 2665 } 2666 2667 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2668 // has a brace-or-equal-initializer, the entity is initialized as specified 2669 // in [dcl.init]. 2670 if (Field->hasInClassInitializer()) { 2671 CXXCtorInitializer *Init; 2672 if (Indirect) 2673 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2674 SourceLocation(), 2675 SourceLocation(), 0, 2676 SourceLocation()); 2677 else 2678 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2679 SourceLocation(), 2680 SourceLocation(), 0, 2681 SourceLocation()); 2682 Info.AllToInit.push_back(Init); 2683 return false; 2684 } 2685 2686 // Don't build an implicit initializer for union members if none was 2687 // explicitly specified. 2688 if (Field->getParent()->isUnion() || 2689 (Indirect && isWithinAnonymousUnion(Indirect))) 2690 return false; 2691 2692 // Don't try to build an implicit initializer if there were semantic 2693 // errors in any of the initializers (and therefore we might be 2694 // missing some that the user actually wrote). 2695 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2696 return false; 2697 2698 CXXCtorInitializer *Init = 0; 2699 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2700 Indirect, Init)) 2701 return true; 2702 2703 if (Init) 2704 Info.AllToInit.push_back(Init); 2705 2706 return false; 2707} 2708 2709bool 2710Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2711 CXXCtorInitializer *Initializer) { 2712 assert(Initializer->isDelegatingInitializer()); 2713 Constructor->setNumCtorInitializers(1); 2714 CXXCtorInitializer **initializer = 2715 new (Context) CXXCtorInitializer*[1]; 2716 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2717 Constructor->setCtorInitializers(initializer); 2718 2719 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2720 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2721 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2722 } 2723 2724 DelegatingCtorDecls.push_back(Constructor); 2725 2726 return false; 2727} 2728 2729bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2730 CXXCtorInitializer **Initializers, 2731 unsigned NumInitializers, 2732 bool AnyErrors) { 2733 if (Constructor->isDependentContext()) { 2734 // Just store the initializers as written, they will be checked during 2735 // instantiation. 2736 if (NumInitializers > 0) { 2737 Constructor->setNumCtorInitializers(NumInitializers); 2738 CXXCtorInitializer **baseOrMemberInitializers = 2739 new (Context) CXXCtorInitializer*[NumInitializers]; 2740 memcpy(baseOrMemberInitializers, Initializers, 2741 NumInitializers * sizeof(CXXCtorInitializer*)); 2742 Constructor->setCtorInitializers(baseOrMemberInitializers); 2743 } 2744 2745 return false; 2746 } 2747 2748 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2749 2750 // We need to build the initializer AST according to order of construction 2751 // and not what user specified in the Initializers list. 2752 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2753 if (!ClassDecl) 2754 return true; 2755 2756 bool HadError = false; 2757 2758 for (unsigned i = 0; i < NumInitializers; i++) { 2759 CXXCtorInitializer *Member = Initializers[i]; 2760 2761 if (Member->isBaseInitializer()) 2762 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2763 else 2764 Info.AllBaseFields[Member->getAnyMember()] = Member; 2765 } 2766 2767 // Keep track of the direct virtual bases. 2768 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2769 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2770 E = ClassDecl->bases_end(); I != E; ++I) { 2771 if (I->isVirtual()) 2772 DirectVBases.insert(I); 2773 } 2774 2775 // Push virtual bases before others. 2776 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2777 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2778 2779 if (CXXCtorInitializer *Value 2780 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2781 Info.AllToInit.push_back(Value); 2782 } else if (!AnyErrors) { 2783 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2784 CXXCtorInitializer *CXXBaseInit; 2785 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2786 VBase, IsInheritedVirtualBase, 2787 CXXBaseInit)) { 2788 HadError = true; 2789 continue; 2790 } 2791 2792 Info.AllToInit.push_back(CXXBaseInit); 2793 } 2794 } 2795 2796 // Non-virtual bases. 2797 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2798 E = ClassDecl->bases_end(); Base != E; ++Base) { 2799 // Virtuals are in the virtual base list and already constructed. 2800 if (Base->isVirtual()) 2801 continue; 2802 2803 if (CXXCtorInitializer *Value 2804 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2805 Info.AllToInit.push_back(Value); 2806 } else if (!AnyErrors) { 2807 CXXCtorInitializer *CXXBaseInit; 2808 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2809 Base, /*IsInheritedVirtualBase=*/false, 2810 CXXBaseInit)) { 2811 HadError = true; 2812 continue; 2813 } 2814 2815 Info.AllToInit.push_back(CXXBaseInit); 2816 } 2817 } 2818 2819 // Fields. 2820 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2821 MemEnd = ClassDecl->decls_end(); 2822 Mem != MemEnd; ++Mem) { 2823 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2824 // C++ [class.bit]p2: 2825 // A declaration for a bit-field that omits the identifier declares an 2826 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2827 // initialized. 2828 if (F->isUnnamedBitfield()) 2829 continue; 2830 2831 if (F->getType()->isIncompleteArrayType()) { 2832 assert(ClassDecl->hasFlexibleArrayMember() && 2833 "Incomplete array type is not valid"); 2834 continue; 2835 } 2836 2837 // If we're not generating the implicit copy/move constructor, then we'll 2838 // handle anonymous struct/union fields based on their individual 2839 // indirect fields. 2840 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2841 continue; 2842 2843 if (CollectFieldInitializer(*this, Info, F)) 2844 HadError = true; 2845 continue; 2846 } 2847 2848 // Beyond this point, we only consider default initialization. 2849 if (Info.IIK != IIK_Default) 2850 continue; 2851 2852 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2853 if (F->getType()->isIncompleteArrayType()) { 2854 assert(ClassDecl->hasFlexibleArrayMember() && 2855 "Incomplete array type is not valid"); 2856 continue; 2857 } 2858 2859 // Initialize each field of an anonymous struct individually. 2860 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2861 HadError = true; 2862 2863 continue; 2864 } 2865 } 2866 2867 NumInitializers = Info.AllToInit.size(); 2868 if (NumInitializers > 0) { 2869 Constructor->setNumCtorInitializers(NumInitializers); 2870 CXXCtorInitializer **baseOrMemberInitializers = 2871 new (Context) CXXCtorInitializer*[NumInitializers]; 2872 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2873 NumInitializers * sizeof(CXXCtorInitializer*)); 2874 Constructor->setCtorInitializers(baseOrMemberInitializers); 2875 2876 // Constructors implicitly reference the base and member 2877 // destructors. 2878 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2879 Constructor->getParent()); 2880 } 2881 2882 return HadError; 2883} 2884 2885static void *GetKeyForTopLevelField(FieldDecl *Field) { 2886 // For anonymous unions, use the class declaration as the key. 2887 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2888 if (RT->getDecl()->isAnonymousStructOrUnion()) 2889 return static_cast<void *>(RT->getDecl()); 2890 } 2891 return static_cast<void *>(Field); 2892} 2893 2894static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2895 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2896} 2897 2898static void *GetKeyForMember(ASTContext &Context, 2899 CXXCtorInitializer *Member) { 2900 if (!Member->isAnyMemberInitializer()) 2901 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2902 2903 // For fields injected into the class via declaration of an anonymous union, 2904 // use its anonymous union class declaration as the unique key. 2905 FieldDecl *Field = Member->getAnyMember(); 2906 2907 // If the field is a member of an anonymous struct or union, our key 2908 // is the anonymous record decl that's a direct child of the class. 2909 RecordDecl *RD = Field->getParent(); 2910 if (RD->isAnonymousStructOrUnion()) { 2911 while (true) { 2912 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2913 if (Parent->isAnonymousStructOrUnion()) 2914 RD = Parent; 2915 else 2916 break; 2917 } 2918 2919 return static_cast<void *>(RD); 2920 } 2921 2922 return static_cast<void *>(Field); 2923} 2924 2925static void 2926DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2927 const CXXConstructorDecl *Constructor, 2928 CXXCtorInitializer **Inits, 2929 unsigned NumInits) { 2930 if (Constructor->getDeclContext()->isDependentContext()) 2931 return; 2932 2933 // Don't check initializers order unless the warning is enabled at the 2934 // location of at least one initializer. 2935 bool ShouldCheckOrder = false; 2936 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2937 CXXCtorInitializer *Init = Inits[InitIndex]; 2938 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2939 Init->getSourceLocation()) 2940 != DiagnosticsEngine::Ignored) { 2941 ShouldCheckOrder = true; 2942 break; 2943 } 2944 } 2945 if (!ShouldCheckOrder) 2946 return; 2947 2948 // Build the list of bases and members in the order that they'll 2949 // actually be initialized. The explicit initializers should be in 2950 // this same order but may be missing things. 2951 SmallVector<const void*, 32> IdealInitKeys; 2952 2953 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2954 2955 // 1. Virtual bases. 2956 for (CXXRecordDecl::base_class_const_iterator VBase = 2957 ClassDecl->vbases_begin(), 2958 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2959 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2960 2961 // 2. Non-virtual bases. 2962 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2963 E = ClassDecl->bases_end(); Base != E; ++Base) { 2964 if (Base->isVirtual()) 2965 continue; 2966 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2967 } 2968 2969 // 3. Direct fields. 2970 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2971 E = ClassDecl->field_end(); Field != E; ++Field) { 2972 if (Field->isUnnamedBitfield()) 2973 continue; 2974 2975 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2976 } 2977 2978 unsigned NumIdealInits = IdealInitKeys.size(); 2979 unsigned IdealIndex = 0; 2980 2981 CXXCtorInitializer *PrevInit = 0; 2982 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2983 CXXCtorInitializer *Init = Inits[InitIndex]; 2984 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2985 2986 // Scan forward to try to find this initializer in the idealized 2987 // initializers list. 2988 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2989 if (InitKey == IdealInitKeys[IdealIndex]) 2990 break; 2991 2992 // If we didn't find this initializer, it must be because we 2993 // scanned past it on a previous iteration. That can only 2994 // happen if we're out of order; emit a warning. 2995 if (IdealIndex == NumIdealInits && PrevInit) { 2996 Sema::SemaDiagnosticBuilder D = 2997 SemaRef.Diag(PrevInit->getSourceLocation(), 2998 diag::warn_initializer_out_of_order); 2999 3000 if (PrevInit->isAnyMemberInitializer()) 3001 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3002 else 3003 D << 1 << PrevInit->getBaseClassInfo()->getType(); 3004 3005 if (Init->isAnyMemberInitializer()) 3006 D << 0 << Init->getAnyMember()->getDeclName(); 3007 else 3008 D << 1 << Init->getBaseClassInfo()->getType(); 3009 3010 // Move back to the initializer's location in the ideal list. 3011 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3012 if (InitKey == IdealInitKeys[IdealIndex]) 3013 break; 3014 3015 assert(IdealIndex != NumIdealInits && 3016 "initializer not found in initializer list"); 3017 } 3018 3019 PrevInit = Init; 3020 } 3021} 3022 3023namespace { 3024bool CheckRedundantInit(Sema &S, 3025 CXXCtorInitializer *Init, 3026 CXXCtorInitializer *&PrevInit) { 3027 if (!PrevInit) { 3028 PrevInit = Init; 3029 return false; 3030 } 3031 3032 if (FieldDecl *Field = Init->getMember()) 3033 S.Diag(Init->getSourceLocation(), 3034 diag::err_multiple_mem_initialization) 3035 << Field->getDeclName() 3036 << Init->getSourceRange(); 3037 else { 3038 const Type *BaseClass = Init->getBaseClass(); 3039 assert(BaseClass && "neither field nor base"); 3040 S.Diag(Init->getSourceLocation(), 3041 diag::err_multiple_base_initialization) 3042 << QualType(BaseClass, 0) 3043 << Init->getSourceRange(); 3044 } 3045 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3046 << 0 << PrevInit->getSourceRange(); 3047 3048 return true; 3049} 3050 3051typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3052typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3053 3054bool CheckRedundantUnionInit(Sema &S, 3055 CXXCtorInitializer *Init, 3056 RedundantUnionMap &Unions) { 3057 FieldDecl *Field = Init->getAnyMember(); 3058 RecordDecl *Parent = Field->getParent(); 3059 if (!Parent->isAnonymousStructOrUnion()) 3060 return false; 3061 3062 NamedDecl *Child = Field; 3063 do { 3064 if (Parent->isUnion()) { 3065 UnionEntry &En = Unions[Parent]; 3066 if (En.first && En.first != Child) { 3067 S.Diag(Init->getSourceLocation(), 3068 diag::err_multiple_mem_union_initialization) 3069 << Field->getDeclName() 3070 << Init->getSourceRange(); 3071 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3072 << 0 << En.second->getSourceRange(); 3073 return true; 3074 } else if (!En.first) { 3075 En.first = Child; 3076 En.second = Init; 3077 } 3078 } 3079 3080 Child = Parent; 3081 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3082 } while (Parent->isAnonymousStructOrUnion()); 3083 3084 return false; 3085} 3086} 3087 3088/// ActOnMemInitializers - Handle the member initializers for a constructor. 3089void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3090 SourceLocation ColonLoc, 3091 CXXCtorInitializer **meminits, 3092 unsigned NumMemInits, 3093 bool AnyErrors) { 3094 if (!ConstructorDecl) 3095 return; 3096 3097 AdjustDeclIfTemplate(ConstructorDecl); 3098 3099 CXXConstructorDecl *Constructor 3100 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3101 3102 if (!Constructor) { 3103 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3104 return; 3105 } 3106 3107 CXXCtorInitializer **MemInits = 3108 reinterpret_cast<CXXCtorInitializer **>(meminits); 3109 3110 // Mapping for the duplicate initializers check. 3111 // For member initializers, this is keyed with a FieldDecl*. 3112 // For base initializers, this is keyed with a Type*. 3113 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3114 3115 // Mapping for the inconsistent anonymous-union initializers check. 3116 RedundantUnionMap MemberUnions; 3117 3118 bool HadError = false; 3119 for (unsigned i = 0; i < NumMemInits; i++) { 3120 CXXCtorInitializer *Init = MemInits[i]; 3121 3122 // Set the source order index. 3123 Init->setSourceOrder(i); 3124 3125 if (Init->isAnyMemberInitializer()) { 3126 FieldDecl *Field = Init->getAnyMember(); 3127 if (CheckRedundantInit(*this, Init, Members[Field]) || 3128 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3129 HadError = true; 3130 } else if (Init->isBaseInitializer()) { 3131 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3132 if (CheckRedundantInit(*this, Init, Members[Key])) 3133 HadError = true; 3134 } else { 3135 assert(Init->isDelegatingInitializer()); 3136 // This must be the only initializer 3137 if (i != 0 || NumMemInits > 1) { 3138 Diag(MemInits[0]->getSourceLocation(), 3139 diag::err_delegating_initializer_alone) 3140 << MemInits[0]->getSourceRange(); 3141 HadError = true; 3142 // We will treat this as being the only initializer. 3143 } 3144 SetDelegatingInitializer(Constructor, MemInits[i]); 3145 // Return immediately as the initializer is set. 3146 return; 3147 } 3148 } 3149 3150 if (HadError) 3151 return; 3152 3153 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3154 3155 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3156} 3157 3158void 3159Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3160 CXXRecordDecl *ClassDecl) { 3161 // Ignore dependent contexts. Also ignore unions, since their members never 3162 // have destructors implicitly called. 3163 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3164 return; 3165 3166 // FIXME: all the access-control diagnostics are positioned on the 3167 // field/base declaration. That's probably good; that said, the 3168 // user might reasonably want to know why the destructor is being 3169 // emitted, and we currently don't say. 3170 3171 // Non-static data members. 3172 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3173 E = ClassDecl->field_end(); I != E; ++I) { 3174 FieldDecl *Field = *I; 3175 if (Field->isInvalidDecl()) 3176 continue; 3177 QualType FieldType = Context.getBaseElementType(Field->getType()); 3178 3179 const RecordType* RT = FieldType->getAs<RecordType>(); 3180 if (!RT) 3181 continue; 3182 3183 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3184 if (FieldClassDecl->isInvalidDecl()) 3185 continue; 3186 if (FieldClassDecl->hasTrivialDestructor()) 3187 continue; 3188 3189 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3190 assert(Dtor && "No dtor found for FieldClassDecl!"); 3191 CheckDestructorAccess(Field->getLocation(), Dtor, 3192 PDiag(diag::err_access_dtor_field) 3193 << Field->getDeclName() 3194 << FieldType); 3195 3196 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3197 } 3198 3199 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3200 3201 // Bases. 3202 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3203 E = ClassDecl->bases_end(); Base != E; ++Base) { 3204 // Bases are always records in a well-formed non-dependent class. 3205 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3206 3207 // Remember direct virtual bases. 3208 if (Base->isVirtual()) 3209 DirectVirtualBases.insert(RT); 3210 3211 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3212 // If our base class is invalid, we probably can't get its dtor anyway. 3213 if (BaseClassDecl->isInvalidDecl()) 3214 continue; 3215 // Ignore trivial destructors. 3216 if (BaseClassDecl->hasTrivialDestructor()) 3217 continue; 3218 3219 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3220 assert(Dtor && "No dtor found for BaseClassDecl!"); 3221 3222 // FIXME: caret should be on the start of the class name 3223 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3224 PDiag(diag::err_access_dtor_base) 3225 << Base->getType() 3226 << Base->getSourceRange()); 3227 3228 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3229 } 3230 3231 // Virtual bases. 3232 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3233 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3234 3235 // Bases are always records in a well-formed non-dependent class. 3236 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3237 3238 // Ignore direct virtual bases. 3239 if (DirectVirtualBases.count(RT)) 3240 continue; 3241 3242 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3243 // If our base class is invalid, we probably can't get its dtor anyway. 3244 if (BaseClassDecl->isInvalidDecl()) 3245 continue; 3246 // Ignore trivial destructors. 3247 if (BaseClassDecl->hasTrivialDestructor()) 3248 continue; 3249 3250 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3251 assert(Dtor && "No dtor found for BaseClassDecl!"); 3252 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3253 PDiag(diag::err_access_dtor_vbase) 3254 << VBase->getType()); 3255 3256 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3257 } 3258} 3259 3260void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3261 if (!CDtorDecl) 3262 return; 3263 3264 if (CXXConstructorDecl *Constructor 3265 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3266 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3267} 3268 3269bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3270 unsigned DiagID, AbstractDiagSelID SelID) { 3271 if (SelID == -1) 3272 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3273 else 3274 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3275} 3276 3277bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3278 const PartialDiagnostic &PD) { 3279 if (!getLangOptions().CPlusPlus) 3280 return false; 3281 3282 if (const ArrayType *AT = Context.getAsArrayType(T)) 3283 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3284 3285 if (const PointerType *PT = T->getAs<PointerType>()) { 3286 // Find the innermost pointer type. 3287 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3288 PT = T; 3289 3290 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3291 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3292 } 3293 3294 const RecordType *RT = T->getAs<RecordType>(); 3295 if (!RT) 3296 return false; 3297 3298 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3299 3300 // We can't answer whether something is abstract until it has a 3301 // definition. If it's currently being defined, we'll walk back 3302 // over all the declarations when we have a full definition. 3303 const CXXRecordDecl *Def = RD->getDefinition(); 3304 if (!Def || Def->isBeingDefined()) 3305 return false; 3306 3307 if (!RD->isAbstract()) 3308 return false; 3309 3310 Diag(Loc, PD) << RD->getDeclName(); 3311 DiagnoseAbstractType(RD); 3312 3313 return true; 3314} 3315 3316void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3317 // Check if we've already emitted the list of pure virtual functions 3318 // for this class. 3319 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3320 return; 3321 3322 CXXFinalOverriderMap FinalOverriders; 3323 RD->getFinalOverriders(FinalOverriders); 3324 3325 // Keep a set of seen pure methods so we won't diagnose the same method 3326 // more than once. 3327 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3328 3329 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3330 MEnd = FinalOverriders.end(); 3331 M != MEnd; 3332 ++M) { 3333 for (OverridingMethods::iterator SO = M->second.begin(), 3334 SOEnd = M->second.end(); 3335 SO != SOEnd; ++SO) { 3336 // C++ [class.abstract]p4: 3337 // A class is abstract if it contains or inherits at least one 3338 // pure virtual function for which the final overrider is pure 3339 // virtual. 3340 3341 // 3342 if (SO->second.size() != 1) 3343 continue; 3344 3345 if (!SO->second.front().Method->isPure()) 3346 continue; 3347 3348 if (!SeenPureMethods.insert(SO->second.front().Method)) 3349 continue; 3350 3351 Diag(SO->second.front().Method->getLocation(), 3352 diag::note_pure_virtual_function) 3353 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3354 } 3355 } 3356 3357 if (!PureVirtualClassDiagSet) 3358 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3359 PureVirtualClassDiagSet->insert(RD); 3360} 3361 3362namespace { 3363struct AbstractUsageInfo { 3364 Sema &S; 3365 CXXRecordDecl *Record; 3366 CanQualType AbstractType; 3367 bool Invalid; 3368 3369 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3370 : S(S), Record(Record), 3371 AbstractType(S.Context.getCanonicalType( 3372 S.Context.getTypeDeclType(Record))), 3373 Invalid(false) {} 3374 3375 void DiagnoseAbstractType() { 3376 if (Invalid) return; 3377 S.DiagnoseAbstractType(Record); 3378 Invalid = true; 3379 } 3380 3381 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3382}; 3383 3384struct CheckAbstractUsage { 3385 AbstractUsageInfo &Info; 3386 const NamedDecl *Ctx; 3387 3388 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3389 : Info(Info), Ctx(Ctx) {} 3390 3391 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3392 switch (TL.getTypeLocClass()) { 3393#define ABSTRACT_TYPELOC(CLASS, PARENT) 3394#define TYPELOC(CLASS, PARENT) \ 3395 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3396#include "clang/AST/TypeLocNodes.def" 3397 } 3398 } 3399 3400 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3401 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3402 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3403 if (!TL.getArg(I)) 3404 continue; 3405 3406 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3407 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3408 } 3409 } 3410 3411 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3412 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3413 } 3414 3415 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3416 // Visit the type parameters from a permissive context. 3417 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3418 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3419 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3420 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3421 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3422 // TODO: other template argument types? 3423 } 3424 } 3425 3426 // Visit pointee types from a permissive context. 3427#define CheckPolymorphic(Type) \ 3428 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3429 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3430 } 3431 CheckPolymorphic(PointerTypeLoc) 3432 CheckPolymorphic(ReferenceTypeLoc) 3433 CheckPolymorphic(MemberPointerTypeLoc) 3434 CheckPolymorphic(BlockPointerTypeLoc) 3435 CheckPolymorphic(AtomicTypeLoc) 3436 3437 /// Handle all the types we haven't given a more specific 3438 /// implementation for above. 3439 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3440 // Every other kind of type that we haven't called out already 3441 // that has an inner type is either (1) sugar or (2) contains that 3442 // inner type in some way as a subobject. 3443 if (TypeLoc Next = TL.getNextTypeLoc()) 3444 return Visit(Next, Sel); 3445 3446 // If there's no inner type and we're in a permissive context, 3447 // don't diagnose. 3448 if (Sel == Sema::AbstractNone) return; 3449 3450 // Check whether the type matches the abstract type. 3451 QualType T = TL.getType(); 3452 if (T->isArrayType()) { 3453 Sel = Sema::AbstractArrayType; 3454 T = Info.S.Context.getBaseElementType(T); 3455 } 3456 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3457 if (CT != Info.AbstractType) return; 3458 3459 // It matched; do some magic. 3460 if (Sel == Sema::AbstractArrayType) { 3461 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3462 << T << TL.getSourceRange(); 3463 } else { 3464 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3465 << Sel << T << TL.getSourceRange(); 3466 } 3467 Info.DiagnoseAbstractType(); 3468 } 3469}; 3470 3471void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3472 Sema::AbstractDiagSelID Sel) { 3473 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3474} 3475 3476} 3477 3478/// Check for invalid uses of an abstract type in a method declaration. 3479static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3480 CXXMethodDecl *MD) { 3481 // No need to do the check on definitions, which require that 3482 // the return/param types be complete. 3483 if (MD->doesThisDeclarationHaveABody()) 3484 return; 3485 3486 // For safety's sake, just ignore it if we don't have type source 3487 // information. This should never happen for non-implicit methods, 3488 // but... 3489 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3490 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3491} 3492 3493/// Check for invalid uses of an abstract type within a class definition. 3494static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3495 CXXRecordDecl *RD) { 3496 for (CXXRecordDecl::decl_iterator 3497 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3498 Decl *D = *I; 3499 if (D->isImplicit()) continue; 3500 3501 // Methods and method templates. 3502 if (isa<CXXMethodDecl>(D)) { 3503 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3504 } else if (isa<FunctionTemplateDecl>(D)) { 3505 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3506 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3507 3508 // Fields and static variables. 3509 } else if (isa<FieldDecl>(D)) { 3510 FieldDecl *FD = cast<FieldDecl>(D); 3511 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3512 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3513 } else if (isa<VarDecl>(D)) { 3514 VarDecl *VD = cast<VarDecl>(D); 3515 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3516 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3517 3518 // Nested classes and class templates. 3519 } else if (isa<CXXRecordDecl>(D)) { 3520 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3521 } else if (isa<ClassTemplateDecl>(D)) { 3522 CheckAbstractClassUsage(Info, 3523 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3524 } 3525 } 3526} 3527 3528/// \brief Perform semantic checks on a class definition that has been 3529/// completing, introducing implicitly-declared members, checking for 3530/// abstract types, etc. 3531void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3532 if (!Record) 3533 return; 3534 3535 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3536 AbstractUsageInfo Info(*this, Record); 3537 CheckAbstractClassUsage(Info, Record); 3538 } 3539 3540 // If this is not an aggregate type and has no user-declared constructor, 3541 // complain about any non-static data members of reference or const scalar 3542 // type, since they will never get initializers. 3543 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3544 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3545 bool Complained = false; 3546 for (RecordDecl::field_iterator F = Record->field_begin(), 3547 FEnd = Record->field_end(); 3548 F != FEnd; ++F) { 3549 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3550 continue; 3551 3552 if (F->getType()->isReferenceType() || 3553 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3554 if (!Complained) { 3555 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3556 << Record->getTagKind() << Record; 3557 Complained = true; 3558 } 3559 3560 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3561 << F->getType()->isReferenceType() 3562 << F->getDeclName(); 3563 } 3564 } 3565 } 3566 3567 if (Record->isDynamicClass() && !Record->isDependentType()) 3568 DynamicClasses.push_back(Record); 3569 3570 if (Record->getIdentifier()) { 3571 // C++ [class.mem]p13: 3572 // If T is the name of a class, then each of the following shall have a 3573 // name different from T: 3574 // - every member of every anonymous union that is a member of class T. 3575 // 3576 // C++ [class.mem]p14: 3577 // In addition, if class T has a user-declared constructor (12.1), every 3578 // non-static data member of class T shall have a name different from T. 3579 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3580 R.first != R.second; ++R.first) { 3581 NamedDecl *D = *R.first; 3582 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3583 isa<IndirectFieldDecl>(D)) { 3584 Diag(D->getLocation(), diag::err_member_name_of_class) 3585 << D->getDeclName(); 3586 break; 3587 } 3588 } 3589 } 3590 3591 // Warn if the class has virtual methods but non-virtual public destructor. 3592 if (Record->isPolymorphic() && !Record->isDependentType()) { 3593 CXXDestructorDecl *dtor = Record->getDestructor(); 3594 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3595 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3596 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3597 } 3598 3599 // See if a method overloads virtual methods in a base 3600 /// class without overriding any. 3601 if (!Record->isDependentType()) { 3602 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3603 MEnd = Record->method_end(); 3604 M != MEnd; ++M) { 3605 if (!(*M)->isStatic()) 3606 DiagnoseHiddenVirtualMethods(Record, *M); 3607 } 3608 } 3609 3610 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3611 // function that is not a constructor declares that member function to be 3612 // const. [...] The class of which that function is a member shall be 3613 // a literal type. 3614 // 3615 // It's fine to diagnose constructors here too: such constructors cannot 3616 // produce a constant expression, so are ill-formed (no diagnostic required). 3617 // 3618 // If the class has virtual bases, any constexpr members will already have 3619 // been diagnosed by the checks performed on the member declaration, so 3620 // suppress this (less useful) diagnostic. 3621 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3622 !Record->isLiteral() && !Record->getNumVBases()) { 3623 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3624 MEnd = Record->method_end(); 3625 M != MEnd; ++M) { 3626 if ((*M)->isConstexpr()) { 3627 switch (Record->getTemplateSpecializationKind()) { 3628 case TSK_ImplicitInstantiation: 3629 case TSK_ExplicitInstantiationDeclaration: 3630 case TSK_ExplicitInstantiationDefinition: 3631 // If a template instantiates to a non-literal type, but its members 3632 // instantiate to constexpr functions, the template is technically 3633 // ill-formed, but we allow it for sanity. Such members are treated as 3634 // non-constexpr. 3635 (*M)->setConstexpr(false); 3636 continue; 3637 3638 case TSK_Undeclared: 3639 case TSK_ExplicitSpecialization: 3640 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3641 PDiag(diag::err_constexpr_method_non_literal)); 3642 break; 3643 } 3644 3645 // Only produce one error per class. 3646 break; 3647 } 3648 } 3649 } 3650 3651 // Declare inherited constructors. We do this eagerly here because: 3652 // - The standard requires an eager diagnostic for conflicting inherited 3653 // constructors from different classes. 3654 // - The lazy declaration of the other implicit constructors is so as to not 3655 // waste space and performance on classes that are not meant to be 3656 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3657 // have inherited constructors. 3658 DeclareInheritedConstructors(Record); 3659 3660 if (!Record->isDependentType()) 3661 CheckExplicitlyDefaultedMethods(Record); 3662} 3663 3664void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3665 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3666 ME = Record->method_end(); 3667 MI != ME; ++MI) { 3668 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3669 switch (getSpecialMember(*MI)) { 3670 case CXXDefaultConstructor: 3671 CheckExplicitlyDefaultedDefaultConstructor( 3672 cast<CXXConstructorDecl>(*MI)); 3673 break; 3674 3675 case CXXDestructor: 3676 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3677 break; 3678 3679 case CXXCopyConstructor: 3680 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3681 break; 3682 3683 case CXXCopyAssignment: 3684 CheckExplicitlyDefaultedCopyAssignment(*MI); 3685 break; 3686 3687 case CXXMoveConstructor: 3688 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3689 break; 3690 3691 case CXXMoveAssignment: 3692 CheckExplicitlyDefaultedMoveAssignment(*MI); 3693 break; 3694 3695 case CXXInvalid: 3696 llvm_unreachable("non-special member explicitly defaulted!"); 3697 } 3698 } 3699 } 3700 3701} 3702 3703void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3704 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3705 3706 // Whether this was the first-declared instance of the constructor. 3707 // This affects whether we implicitly add an exception spec (and, eventually, 3708 // constexpr). It is also ill-formed to explicitly default a constructor such 3709 // that it would be deleted. (C++0x [decl.fct.def.default]) 3710 bool First = CD == CD->getCanonicalDecl(); 3711 3712 bool HadError = false; 3713 if (CD->getNumParams() != 0) { 3714 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3715 << CD->getSourceRange(); 3716 HadError = true; 3717 } 3718 3719 ImplicitExceptionSpecification Spec 3720 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3721 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3722 if (EPI.ExceptionSpecType == EST_Delayed) { 3723 // Exception specification depends on some deferred part of the class. We'll 3724 // try again when the class's definition has been fully processed. 3725 return; 3726 } 3727 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3728 *ExceptionType = Context.getFunctionType( 3729 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3730 3731 if (CtorType->hasExceptionSpec()) { 3732 if (CheckEquivalentExceptionSpec( 3733 PDiag(diag::err_incorrect_defaulted_exception_spec) 3734 << CXXDefaultConstructor, 3735 PDiag(), 3736 ExceptionType, SourceLocation(), 3737 CtorType, CD->getLocation())) { 3738 HadError = true; 3739 } 3740 } else if (First) { 3741 // We set the declaration to have the computed exception spec here. 3742 // We know there are no parameters. 3743 EPI.ExtInfo = CtorType->getExtInfo(); 3744 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3745 } 3746 3747 if (HadError) { 3748 CD->setInvalidDecl(); 3749 return; 3750 } 3751 3752 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3753 if (First) { 3754 CD->setDeletedAsWritten(); 3755 } else { 3756 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3757 << CXXDefaultConstructor; 3758 CD->setInvalidDecl(); 3759 } 3760 } 3761} 3762 3763void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3764 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3765 3766 // Whether this was the first-declared instance of the constructor. 3767 bool First = CD == CD->getCanonicalDecl(); 3768 3769 bool HadError = false; 3770 if (CD->getNumParams() != 1) { 3771 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3772 << CD->getSourceRange(); 3773 HadError = true; 3774 } 3775 3776 ImplicitExceptionSpecification Spec(Context); 3777 bool Const; 3778 llvm::tie(Spec, Const) = 3779 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3780 3781 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3782 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3783 *ExceptionType = Context.getFunctionType( 3784 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3785 3786 // Check for parameter type matching. 3787 // This is a copy ctor so we know it's a cv-qualified reference to T. 3788 QualType ArgType = CtorType->getArgType(0); 3789 if (ArgType->getPointeeType().isVolatileQualified()) { 3790 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3791 HadError = true; 3792 } 3793 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3794 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3795 HadError = true; 3796 } 3797 3798 if (CtorType->hasExceptionSpec()) { 3799 if (CheckEquivalentExceptionSpec( 3800 PDiag(diag::err_incorrect_defaulted_exception_spec) 3801 << CXXCopyConstructor, 3802 PDiag(), 3803 ExceptionType, SourceLocation(), 3804 CtorType, CD->getLocation())) { 3805 HadError = true; 3806 } 3807 } else if (First) { 3808 // We set the declaration to have the computed exception spec here. 3809 // We duplicate the one parameter type. 3810 EPI.ExtInfo = CtorType->getExtInfo(); 3811 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3812 } 3813 3814 if (HadError) { 3815 CD->setInvalidDecl(); 3816 return; 3817 } 3818 3819 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3820 if (First) { 3821 CD->setDeletedAsWritten(); 3822 } else { 3823 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3824 << CXXCopyConstructor; 3825 CD->setInvalidDecl(); 3826 } 3827 } 3828} 3829 3830void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3831 assert(MD->isExplicitlyDefaulted()); 3832 3833 // Whether this was the first-declared instance of the operator 3834 bool First = MD == MD->getCanonicalDecl(); 3835 3836 bool HadError = false; 3837 if (MD->getNumParams() != 1) { 3838 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3839 << MD->getSourceRange(); 3840 HadError = true; 3841 } 3842 3843 QualType ReturnType = 3844 MD->getType()->getAs<FunctionType>()->getResultType(); 3845 if (!ReturnType->isLValueReferenceType() || 3846 !Context.hasSameType( 3847 Context.getCanonicalType(ReturnType->getPointeeType()), 3848 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3849 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3850 HadError = true; 3851 } 3852 3853 ImplicitExceptionSpecification Spec(Context); 3854 bool Const; 3855 llvm::tie(Spec, Const) = 3856 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3857 3858 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3859 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3860 *ExceptionType = Context.getFunctionType( 3861 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3862 3863 QualType ArgType = OperType->getArgType(0); 3864 if (!ArgType->isLValueReferenceType()) { 3865 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3866 HadError = true; 3867 } else { 3868 if (ArgType->getPointeeType().isVolatileQualified()) { 3869 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3870 HadError = true; 3871 } 3872 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3873 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3874 HadError = true; 3875 } 3876 } 3877 3878 if (OperType->getTypeQuals()) { 3879 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3880 HadError = true; 3881 } 3882 3883 if (OperType->hasExceptionSpec()) { 3884 if (CheckEquivalentExceptionSpec( 3885 PDiag(diag::err_incorrect_defaulted_exception_spec) 3886 << CXXCopyAssignment, 3887 PDiag(), 3888 ExceptionType, SourceLocation(), 3889 OperType, MD->getLocation())) { 3890 HadError = true; 3891 } 3892 } else if (First) { 3893 // We set the declaration to have the computed exception spec here. 3894 // We duplicate the one parameter type. 3895 EPI.RefQualifier = OperType->getRefQualifier(); 3896 EPI.ExtInfo = OperType->getExtInfo(); 3897 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3898 } 3899 3900 if (HadError) { 3901 MD->setInvalidDecl(); 3902 return; 3903 } 3904 3905 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3906 if (First) { 3907 MD->setDeletedAsWritten(); 3908 } else { 3909 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3910 << CXXCopyAssignment; 3911 MD->setInvalidDecl(); 3912 } 3913 } 3914} 3915 3916void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3917 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3918 3919 // Whether this was the first-declared instance of the constructor. 3920 bool First = CD == CD->getCanonicalDecl(); 3921 3922 bool HadError = false; 3923 if (CD->getNumParams() != 1) { 3924 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3925 << CD->getSourceRange(); 3926 HadError = true; 3927 } 3928 3929 ImplicitExceptionSpecification Spec( 3930 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3931 3932 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3933 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3934 *ExceptionType = Context.getFunctionType( 3935 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3936 3937 // Check for parameter type matching. 3938 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3939 QualType ArgType = CtorType->getArgType(0); 3940 if (ArgType->getPointeeType().isVolatileQualified()) { 3941 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3942 HadError = true; 3943 } 3944 if (ArgType->getPointeeType().isConstQualified()) { 3945 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3946 HadError = true; 3947 } 3948 3949 if (CtorType->hasExceptionSpec()) { 3950 if (CheckEquivalentExceptionSpec( 3951 PDiag(diag::err_incorrect_defaulted_exception_spec) 3952 << CXXMoveConstructor, 3953 PDiag(), 3954 ExceptionType, SourceLocation(), 3955 CtorType, CD->getLocation())) { 3956 HadError = true; 3957 } 3958 } else if (First) { 3959 // We set the declaration to have the computed exception spec here. 3960 // We duplicate the one parameter type. 3961 EPI.ExtInfo = CtorType->getExtInfo(); 3962 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3963 } 3964 3965 if (HadError) { 3966 CD->setInvalidDecl(); 3967 return; 3968 } 3969 3970 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3971 if (First) { 3972 CD->setDeletedAsWritten(); 3973 } else { 3974 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3975 << CXXMoveConstructor; 3976 CD->setInvalidDecl(); 3977 } 3978 } 3979} 3980 3981void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3982 assert(MD->isExplicitlyDefaulted()); 3983 3984 // Whether this was the first-declared instance of the operator 3985 bool First = MD == MD->getCanonicalDecl(); 3986 3987 bool HadError = false; 3988 if (MD->getNumParams() != 1) { 3989 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3990 << MD->getSourceRange(); 3991 HadError = true; 3992 } 3993 3994 QualType ReturnType = 3995 MD->getType()->getAs<FunctionType>()->getResultType(); 3996 if (!ReturnType->isLValueReferenceType() || 3997 !Context.hasSameType( 3998 Context.getCanonicalType(ReturnType->getPointeeType()), 3999 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4000 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4001 HadError = true; 4002 } 4003 4004 ImplicitExceptionSpecification Spec( 4005 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4006 4007 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4008 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4009 *ExceptionType = Context.getFunctionType( 4010 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4011 4012 QualType ArgType = OperType->getArgType(0); 4013 if (!ArgType->isRValueReferenceType()) { 4014 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4015 HadError = true; 4016 } else { 4017 if (ArgType->getPointeeType().isVolatileQualified()) { 4018 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4019 HadError = true; 4020 } 4021 if (ArgType->getPointeeType().isConstQualified()) { 4022 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4023 HadError = true; 4024 } 4025 } 4026 4027 if (OperType->getTypeQuals()) { 4028 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4029 HadError = true; 4030 } 4031 4032 if (OperType->hasExceptionSpec()) { 4033 if (CheckEquivalentExceptionSpec( 4034 PDiag(diag::err_incorrect_defaulted_exception_spec) 4035 << CXXMoveAssignment, 4036 PDiag(), 4037 ExceptionType, SourceLocation(), 4038 OperType, MD->getLocation())) { 4039 HadError = true; 4040 } 4041 } else if (First) { 4042 // We set the declaration to have the computed exception spec here. 4043 // We duplicate the one parameter type. 4044 EPI.RefQualifier = OperType->getRefQualifier(); 4045 EPI.ExtInfo = OperType->getExtInfo(); 4046 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4047 } 4048 4049 if (HadError) { 4050 MD->setInvalidDecl(); 4051 return; 4052 } 4053 4054 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4055 if (First) { 4056 MD->setDeletedAsWritten(); 4057 } else { 4058 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4059 << CXXMoveAssignment; 4060 MD->setInvalidDecl(); 4061 } 4062 } 4063} 4064 4065void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4066 assert(DD->isExplicitlyDefaulted()); 4067 4068 // Whether this was the first-declared instance of the destructor. 4069 bool First = DD == DD->getCanonicalDecl(); 4070 4071 ImplicitExceptionSpecification Spec 4072 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4073 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4074 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4075 *ExceptionType = Context.getFunctionType( 4076 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4077 4078 if (DtorType->hasExceptionSpec()) { 4079 if (CheckEquivalentExceptionSpec( 4080 PDiag(diag::err_incorrect_defaulted_exception_spec) 4081 << CXXDestructor, 4082 PDiag(), 4083 ExceptionType, SourceLocation(), 4084 DtorType, DD->getLocation())) { 4085 DD->setInvalidDecl(); 4086 return; 4087 } 4088 } else if (First) { 4089 // We set the declaration to have the computed exception spec here. 4090 // There are no parameters. 4091 EPI.ExtInfo = DtorType->getExtInfo(); 4092 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4093 } 4094 4095 if (ShouldDeleteDestructor(DD)) { 4096 if (First) { 4097 DD->setDeletedAsWritten(); 4098 } else { 4099 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4100 << CXXDestructor; 4101 DD->setInvalidDecl(); 4102 } 4103 } 4104} 4105 4106/// This function implements the following C++0x paragraphs: 4107/// - [class.ctor]/5 4108/// - [class.copy]/11 4109bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4110 assert(!MD->isInvalidDecl()); 4111 CXXRecordDecl *RD = MD->getParent(); 4112 assert(!RD->isDependentType() && "do deletion after instantiation"); 4113 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4114 return false; 4115 4116 bool IsUnion = RD->isUnion(); 4117 bool IsConstructor = false; 4118 bool IsAssignment = false; 4119 bool IsMove = false; 4120 4121 bool ConstArg = false; 4122 4123 switch (CSM) { 4124 case CXXDefaultConstructor: 4125 IsConstructor = true; 4126 break; 4127 case CXXCopyConstructor: 4128 IsConstructor = true; 4129 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4130 break; 4131 case CXXMoveConstructor: 4132 IsConstructor = true; 4133 IsMove = true; 4134 break; 4135 default: 4136 llvm_unreachable("function only currently implemented for default ctors"); 4137 } 4138 4139 SourceLocation Loc = MD->getLocation(); 4140 4141 // Do access control from the special member function 4142 ContextRAII MethodContext(*this, MD); 4143 4144 bool AllConst = true; 4145 4146 // We do this because we should never actually use an anonymous 4147 // union's constructor. 4148 if (IsUnion && RD->isAnonymousStructOrUnion()) 4149 return false; 4150 4151 // FIXME: We should put some diagnostic logic right into this function. 4152 4153 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4154 BE = RD->bases_end(); 4155 BI != BE; ++BI) { 4156 // We'll handle this one later 4157 if (BI->isVirtual()) 4158 continue; 4159 4160 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4161 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4162 4163 // Unless we have an assignment operator, the base's destructor must 4164 // be accessible and not deleted. 4165 if (!IsAssignment) { 4166 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4167 if (BaseDtor->isDeleted()) 4168 return true; 4169 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4170 AR_accessible) 4171 return true; 4172 } 4173 4174 // Finding the corresponding member in the base should lead to a 4175 // unique, accessible, non-deleted function. If we are doing 4176 // a destructor, we have already checked this case. 4177 if (CSM != CXXDestructor) { 4178 SpecialMemberOverloadResult *SMOR = 4179 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4180 false); 4181 if (!SMOR->hasSuccess()) 4182 return true; 4183 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4184 if (IsConstructor) { 4185 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4186 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4187 PDiag()) != AR_accessible) 4188 return true; 4189 4190 // For a move operation, the corresponding operation must actually 4191 // be a move operation (and not a copy selected by overload 4192 // resolution) unless we are working on a trivially copyable class. 4193 if (IsMove && !BaseCtor->isMoveConstructor() && 4194 !BaseDecl->isTriviallyCopyable()) 4195 return true; 4196 } 4197 } 4198 } 4199 4200 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4201 BE = RD->vbases_end(); 4202 BI != BE; ++BI) { 4203 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4204 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4205 4206 // Unless we have an assignment operator, the base's destructor must 4207 // be accessible and not deleted. 4208 if (!IsAssignment) { 4209 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4210 if (BaseDtor->isDeleted()) 4211 return true; 4212 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4213 AR_accessible) 4214 return true; 4215 } 4216 4217 // Finding the corresponding member in the base should lead to a 4218 // unique, accessible, non-deleted function. 4219 if (CSM != CXXDestructor) { 4220 SpecialMemberOverloadResult *SMOR = 4221 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4222 false); 4223 if (!SMOR->hasSuccess()) 4224 return true; 4225 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4226 if (IsConstructor) { 4227 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4228 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4229 PDiag()) != AR_accessible) 4230 return true; 4231 4232 // For a move operation, the corresponding operation must actually 4233 // be a move operation (and not a copy selected by overload 4234 // resolution) unless we are working on a trivially copyable class. 4235 if (IsMove && !BaseCtor->isMoveConstructor() && 4236 !BaseDecl->isTriviallyCopyable()) 4237 return true; 4238 } 4239 } 4240 } 4241 4242 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4243 FE = RD->field_end(); 4244 FI != FE; ++FI) { 4245 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4246 continue; 4247 4248 QualType FieldType = Context.getBaseElementType(FI->getType()); 4249 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4250 4251 // For a default constructor, all references must be initialized in-class 4252 // and, if a union, it must have a non-const member. 4253 if (CSM == CXXDefaultConstructor) { 4254 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4255 return true; 4256 4257 if (IsUnion && !FieldType.isConstQualified()) 4258 AllConst = false; 4259 // For a copy constructor, data members must not be of rvalue reference 4260 // type. 4261 } else if (CSM == CXXCopyConstructor) { 4262 if (FieldType->isRValueReferenceType()) 4263 return true; 4264 } 4265 4266 if (FieldRecord) { 4267 // For a default constructor, a const member must have a user-provided 4268 // default constructor or else be explicitly initialized. 4269 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4270 !FI->hasInClassInitializer() && 4271 !FieldRecord->hasUserProvidedDefaultConstructor()) 4272 return true; 4273 4274 // Some additional restrictions exist on the variant members. 4275 if (!IsUnion && FieldRecord->isUnion() && 4276 FieldRecord->isAnonymousStructOrUnion()) { 4277 // We're okay to reuse AllConst here since we only care about the 4278 // value otherwise if we're in a union. 4279 AllConst = true; 4280 4281 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4282 UE = FieldRecord->field_end(); 4283 UI != UE; ++UI) { 4284 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4285 CXXRecordDecl *UnionFieldRecord = 4286 UnionFieldType->getAsCXXRecordDecl(); 4287 4288 if (!UnionFieldType.isConstQualified()) 4289 AllConst = false; 4290 4291 if (UnionFieldRecord) { 4292 // FIXME: Checking for accessibility and validity of this 4293 // destructor is technically going beyond the 4294 // standard, but this is believed to be a defect. 4295 if (!IsAssignment) { 4296 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4297 if (FieldDtor->isDeleted()) 4298 return true; 4299 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4300 AR_accessible) 4301 return true; 4302 if (!FieldDtor->isTrivial()) 4303 return true; 4304 } 4305 4306 if (CSM != CXXDestructor) { 4307 SpecialMemberOverloadResult *SMOR = 4308 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4309 false, false, false); 4310 // FIXME: Checking for accessibility and validity of this 4311 // corresponding member is technically going beyond the 4312 // standard, but this is believed to be a defect. 4313 if (!SMOR->hasSuccess()) 4314 return true; 4315 4316 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4317 // A member of a union must have a trivial corresponding 4318 // constructor. 4319 if (!FieldMember->isTrivial()) 4320 return true; 4321 4322 if (IsConstructor) { 4323 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4324 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4325 PDiag()) != AR_accessible) 4326 return true; 4327 } 4328 } 4329 } 4330 } 4331 4332 // At least one member in each anonymous union must be non-const 4333 if (CSM == CXXDefaultConstructor && AllConst) 4334 return true; 4335 4336 // Don't try to initialize the anonymous union 4337 // This is technically non-conformant, but sanity demands it. 4338 continue; 4339 } 4340 4341 // Unless we're doing assignment, the field's destructor must be 4342 // accessible and not deleted. 4343 if (!IsAssignment) { 4344 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4345 if (FieldDtor->isDeleted()) 4346 return true; 4347 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4348 AR_accessible) 4349 return true; 4350 } 4351 4352 // Check that the corresponding member of the field is accessible, 4353 // unique, and non-deleted. We don't do this if it has an explicit 4354 // initialization when default-constructing. 4355 if (CSM != CXXDestructor && 4356 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4357 SpecialMemberOverloadResult *SMOR = 4358 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4359 false); 4360 if (!SMOR->hasSuccess()) 4361 return true; 4362 4363 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4364 if (IsConstructor) { 4365 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4366 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4367 PDiag()) != AR_accessible) 4368 return true; 4369 4370 // For a move operation, the corresponding operation must actually 4371 // be a move operation (and not a copy selected by overload 4372 // resolution) unless we are working on a trivially copyable class. 4373 if (IsMove && !FieldCtor->isMoveConstructor() && 4374 !FieldRecord->isTriviallyCopyable()) 4375 return true; 4376 } 4377 4378 // We need the corresponding member of a union to be trivial so that 4379 // we can safely copy them all simultaneously. 4380 // FIXME: Note that performing the check here (where we rely on the lack 4381 // of an in-class initializer) is technically ill-formed. However, this 4382 // seems most obviously to be a bug in the standard. 4383 if (IsUnion && !FieldMember->isTrivial()) 4384 return true; 4385 } 4386 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4387 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4388 // We can't initialize a const member of non-class type to any value. 4389 return true; 4390 } 4391 } 4392 4393 // We can't have all const members in a union when default-constructing, 4394 // or else they're all nonsensical garbage values that can't be changed. 4395 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4396 return true; 4397 4398 return false; 4399} 4400 4401bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4402 CXXRecordDecl *RD = MD->getParent(); 4403 assert(!RD->isDependentType() && "do deletion after instantiation"); 4404 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4405 return false; 4406 4407 SourceLocation Loc = MD->getLocation(); 4408 4409 // Do access control from the constructor 4410 ContextRAII MethodContext(*this, MD); 4411 4412 bool Union = RD->isUnion(); 4413 4414 unsigned ArgQuals = 4415 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4416 Qualifiers::Const : 0; 4417 4418 // We do this because we should never actually use an anonymous 4419 // union's constructor. 4420 if (Union && RD->isAnonymousStructOrUnion()) 4421 return false; 4422 4423 // FIXME: We should put some diagnostic logic right into this function. 4424 4425 // C++0x [class.copy]/20 4426 // A defaulted [copy] assignment operator for class X is defined as deleted 4427 // if X has: 4428 4429 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4430 BE = RD->bases_end(); 4431 BI != BE; ++BI) { 4432 // We'll handle this one later 4433 if (BI->isVirtual()) 4434 continue; 4435 4436 QualType BaseType = BI->getType(); 4437 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4438 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4439 4440 // -- a [direct base class] B that cannot be [copied] because overload 4441 // resolution, as applied to B's [copy] assignment operator, results in 4442 // an ambiguity or a function that is deleted or inaccessible from the 4443 // assignment operator 4444 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4445 0); 4446 if (!CopyOper || CopyOper->isDeleted()) 4447 return true; 4448 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4449 return true; 4450 } 4451 4452 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4453 BE = RD->vbases_end(); 4454 BI != BE; ++BI) { 4455 QualType BaseType = BI->getType(); 4456 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4457 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4458 4459 // -- a [virtual base class] B that cannot be [copied] because overload 4460 // resolution, as applied to B's [copy] assignment operator, results in 4461 // an ambiguity or a function that is deleted or inaccessible from the 4462 // assignment operator 4463 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4464 0); 4465 if (!CopyOper || CopyOper->isDeleted()) 4466 return true; 4467 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4468 return true; 4469 } 4470 4471 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4472 FE = RD->field_end(); 4473 FI != FE; ++FI) { 4474 if (FI->isUnnamedBitfield()) 4475 continue; 4476 4477 QualType FieldType = Context.getBaseElementType(FI->getType()); 4478 4479 // -- a non-static data member of reference type 4480 if (FieldType->isReferenceType()) 4481 return true; 4482 4483 // -- a non-static data member of const non-class type (or array thereof) 4484 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4485 return true; 4486 4487 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4488 4489 if (FieldRecord) { 4490 // This is an anonymous union 4491 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4492 // Anonymous unions inside unions do not variant members create 4493 if (!Union) { 4494 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4495 UE = FieldRecord->field_end(); 4496 UI != UE; ++UI) { 4497 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4498 CXXRecordDecl *UnionFieldRecord = 4499 UnionFieldType->getAsCXXRecordDecl(); 4500 4501 // -- a variant member with a non-trivial [copy] assignment operator 4502 // and X is a union-like class 4503 if (UnionFieldRecord && 4504 !UnionFieldRecord->hasTrivialCopyAssignment()) 4505 return true; 4506 } 4507 } 4508 4509 // Don't try to initalize an anonymous union 4510 continue; 4511 // -- a variant member with a non-trivial [copy] assignment operator 4512 // and X is a union-like class 4513 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4514 return true; 4515 } 4516 4517 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4518 false, 0); 4519 if (!CopyOper || CopyOper->isDeleted()) 4520 return true; 4521 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4522 return true; 4523 } 4524 } 4525 4526 return false; 4527} 4528 4529bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4530 CXXRecordDecl *RD = MD->getParent(); 4531 assert(!RD->isDependentType() && "do deletion after instantiation"); 4532 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4533 return false; 4534 4535 SourceLocation Loc = MD->getLocation(); 4536 4537 // Do access control from the constructor 4538 ContextRAII MethodContext(*this, MD); 4539 4540 bool Union = RD->isUnion(); 4541 4542 // We do this because we should never actually use an anonymous 4543 // union's constructor. 4544 if (Union && RD->isAnonymousStructOrUnion()) 4545 return false; 4546 4547 // C++0x [class.copy]/20 4548 // A defaulted [move] assignment operator for class X is defined as deleted 4549 // if X has: 4550 4551 // -- for the move constructor, [...] any direct or indirect virtual base 4552 // class. 4553 if (RD->getNumVBases() != 0) 4554 return true; 4555 4556 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4557 BE = RD->bases_end(); 4558 BI != BE; ++BI) { 4559 4560 QualType BaseType = BI->getType(); 4561 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4562 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4563 4564 // -- a [direct base class] B that cannot be [moved] because overload 4565 // resolution, as applied to B's [move] assignment operator, results in 4566 // an ambiguity or a function that is deleted or inaccessible from the 4567 // assignment operator 4568 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4569 if (!MoveOper || MoveOper->isDeleted()) 4570 return true; 4571 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4572 return true; 4573 4574 // -- for the move assignment operator, a [direct base class] with a type 4575 // that does not have a move assignment operator and is not trivially 4576 // copyable. 4577 if (!MoveOper->isMoveAssignmentOperator() && 4578 !BaseDecl->isTriviallyCopyable()) 4579 return true; 4580 } 4581 4582 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4583 FE = RD->field_end(); 4584 FI != FE; ++FI) { 4585 if (FI->isUnnamedBitfield()) 4586 continue; 4587 4588 QualType FieldType = Context.getBaseElementType(FI->getType()); 4589 4590 // -- a non-static data member of reference type 4591 if (FieldType->isReferenceType()) 4592 return true; 4593 4594 // -- a non-static data member of const non-class type (or array thereof) 4595 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4596 return true; 4597 4598 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4599 4600 if (FieldRecord) { 4601 // This is an anonymous union 4602 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4603 // Anonymous unions inside unions do not variant members create 4604 if (!Union) { 4605 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4606 UE = FieldRecord->field_end(); 4607 UI != UE; ++UI) { 4608 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4609 CXXRecordDecl *UnionFieldRecord = 4610 UnionFieldType->getAsCXXRecordDecl(); 4611 4612 // -- a variant member with a non-trivial [move] assignment operator 4613 // and X is a union-like class 4614 if (UnionFieldRecord && 4615 !UnionFieldRecord->hasTrivialMoveAssignment()) 4616 return true; 4617 } 4618 } 4619 4620 // Don't try to initalize an anonymous union 4621 continue; 4622 // -- a variant member with a non-trivial [move] assignment operator 4623 // and X is a union-like class 4624 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4625 return true; 4626 } 4627 4628 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4629 if (!MoveOper || MoveOper->isDeleted()) 4630 return true; 4631 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4632 return true; 4633 4634 // -- for the move assignment operator, a [non-static data member] with a 4635 // type that does not have a move assignment operator and is not 4636 // trivially copyable. 4637 if (!MoveOper->isMoveAssignmentOperator() && 4638 !FieldRecord->isTriviallyCopyable()) 4639 return true; 4640 } 4641 } 4642 4643 return false; 4644} 4645 4646bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4647 CXXRecordDecl *RD = DD->getParent(); 4648 assert(!RD->isDependentType() && "do deletion after instantiation"); 4649 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4650 return false; 4651 4652 SourceLocation Loc = DD->getLocation(); 4653 4654 // Do access control from the destructor 4655 ContextRAII CtorContext(*this, DD); 4656 4657 bool Union = RD->isUnion(); 4658 4659 // We do this because we should never actually use an anonymous 4660 // union's destructor. 4661 if (Union && RD->isAnonymousStructOrUnion()) 4662 return false; 4663 4664 // C++0x [class.dtor]p5 4665 // A defaulted destructor for a class X is defined as deleted if: 4666 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4667 BE = RD->bases_end(); 4668 BI != BE; ++BI) { 4669 // We'll handle this one later 4670 if (BI->isVirtual()) 4671 continue; 4672 4673 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4674 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4675 assert(BaseDtor && "base has no destructor"); 4676 4677 // -- any direct or virtual base class has a deleted destructor or 4678 // a destructor that is inaccessible from the defaulted destructor 4679 if (BaseDtor->isDeleted()) 4680 return true; 4681 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4682 AR_accessible) 4683 return true; 4684 } 4685 4686 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4687 BE = RD->vbases_end(); 4688 BI != BE; ++BI) { 4689 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4690 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4691 assert(BaseDtor && "base has no destructor"); 4692 4693 // -- any direct or virtual base class has a deleted destructor or 4694 // a destructor that is inaccessible from the defaulted destructor 4695 if (BaseDtor->isDeleted()) 4696 return true; 4697 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4698 AR_accessible) 4699 return true; 4700 } 4701 4702 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4703 FE = RD->field_end(); 4704 FI != FE; ++FI) { 4705 QualType FieldType = Context.getBaseElementType(FI->getType()); 4706 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4707 if (FieldRecord) { 4708 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4709 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4710 UE = FieldRecord->field_end(); 4711 UI != UE; ++UI) { 4712 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4713 CXXRecordDecl *UnionFieldRecord = 4714 UnionFieldType->getAsCXXRecordDecl(); 4715 4716 // -- X is a union-like class that has a variant member with a non- 4717 // trivial destructor. 4718 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4719 return true; 4720 } 4721 // Technically we are supposed to do this next check unconditionally. 4722 // But that makes absolutely no sense. 4723 } else { 4724 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4725 4726 // -- any of the non-static data members has class type M (or array 4727 // thereof) and M has a deleted destructor or a destructor that is 4728 // inaccessible from the defaulted destructor 4729 if (FieldDtor->isDeleted()) 4730 return true; 4731 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4732 AR_accessible) 4733 return true; 4734 4735 // -- X is a union-like class that has a variant member with a non- 4736 // trivial destructor. 4737 if (Union && !FieldDtor->isTrivial()) 4738 return true; 4739 } 4740 } 4741 } 4742 4743 if (DD->isVirtual()) { 4744 FunctionDecl *OperatorDelete = 0; 4745 DeclarationName Name = 4746 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4747 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4748 false)) 4749 return true; 4750 } 4751 4752 4753 return false; 4754} 4755 4756/// \brief Data used with FindHiddenVirtualMethod 4757namespace { 4758 struct FindHiddenVirtualMethodData { 4759 Sema *S; 4760 CXXMethodDecl *Method; 4761 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4762 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4763 }; 4764} 4765 4766/// \brief Member lookup function that determines whether a given C++ 4767/// method overloads virtual methods in a base class without overriding any, 4768/// to be used with CXXRecordDecl::lookupInBases(). 4769static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4770 CXXBasePath &Path, 4771 void *UserData) { 4772 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4773 4774 FindHiddenVirtualMethodData &Data 4775 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4776 4777 DeclarationName Name = Data.Method->getDeclName(); 4778 assert(Name.getNameKind() == DeclarationName::Identifier); 4779 4780 bool foundSameNameMethod = false; 4781 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4782 for (Path.Decls = BaseRecord->lookup(Name); 4783 Path.Decls.first != Path.Decls.second; 4784 ++Path.Decls.first) { 4785 NamedDecl *D = *Path.Decls.first; 4786 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4787 MD = MD->getCanonicalDecl(); 4788 foundSameNameMethod = true; 4789 // Interested only in hidden virtual methods. 4790 if (!MD->isVirtual()) 4791 continue; 4792 // If the method we are checking overrides a method from its base 4793 // don't warn about the other overloaded methods. 4794 if (!Data.S->IsOverload(Data.Method, MD, false)) 4795 return true; 4796 // Collect the overload only if its hidden. 4797 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4798 overloadedMethods.push_back(MD); 4799 } 4800 } 4801 4802 if (foundSameNameMethod) 4803 Data.OverloadedMethods.append(overloadedMethods.begin(), 4804 overloadedMethods.end()); 4805 return foundSameNameMethod; 4806} 4807 4808/// \brief See if a method overloads virtual methods in a base class without 4809/// overriding any. 4810void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4811 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4812 MD->getLocation()) == DiagnosticsEngine::Ignored) 4813 return; 4814 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4815 return; 4816 4817 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4818 /*bool RecordPaths=*/false, 4819 /*bool DetectVirtual=*/false); 4820 FindHiddenVirtualMethodData Data; 4821 Data.Method = MD; 4822 Data.S = this; 4823 4824 // Keep the base methods that were overriden or introduced in the subclass 4825 // by 'using' in a set. A base method not in this set is hidden. 4826 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4827 res.first != res.second; ++res.first) { 4828 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4829 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4830 E = MD->end_overridden_methods(); 4831 I != E; ++I) 4832 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4833 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4834 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4835 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4836 } 4837 4838 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4839 !Data.OverloadedMethods.empty()) { 4840 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4841 << MD << (Data.OverloadedMethods.size() > 1); 4842 4843 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4844 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4845 Diag(overloadedMD->getLocation(), 4846 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4847 } 4848 } 4849} 4850 4851void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4852 Decl *TagDecl, 4853 SourceLocation LBrac, 4854 SourceLocation RBrac, 4855 AttributeList *AttrList) { 4856 if (!TagDecl) 4857 return; 4858 4859 AdjustDeclIfTemplate(TagDecl); 4860 4861 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4862 // strict aliasing violation! 4863 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4864 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4865 4866 CheckCompletedCXXClass( 4867 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4868} 4869 4870/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4871/// special functions, such as the default constructor, copy 4872/// constructor, or destructor, to the given C++ class (C++ 4873/// [special]p1). This routine can only be executed just before the 4874/// definition of the class is complete. 4875void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4876 if (!ClassDecl->hasUserDeclaredConstructor()) 4877 ++ASTContext::NumImplicitDefaultConstructors; 4878 4879 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4880 ++ASTContext::NumImplicitCopyConstructors; 4881 4882 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4883 ++ASTContext::NumImplicitCopyAssignmentOperators; 4884 4885 // If we have a dynamic class, then the copy assignment operator may be 4886 // virtual, so we have to declare it immediately. This ensures that, e.g., 4887 // it shows up in the right place in the vtable and that we diagnose 4888 // problems with the implicit exception specification. 4889 if (ClassDecl->isDynamicClass()) 4890 DeclareImplicitCopyAssignment(ClassDecl); 4891 } 4892 4893 if (!ClassDecl->hasUserDeclaredDestructor()) { 4894 ++ASTContext::NumImplicitDestructors; 4895 4896 // If we have a dynamic class, then the destructor may be virtual, so we 4897 // have to declare the destructor immediately. This ensures that, e.g., it 4898 // shows up in the right place in the vtable and that we diagnose problems 4899 // with the implicit exception specification. 4900 if (ClassDecl->isDynamicClass()) 4901 DeclareImplicitDestructor(ClassDecl); 4902 } 4903} 4904 4905void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4906 if (!D) 4907 return; 4908 4909 int NumParamList = D->getNumTemplateParameterLists(); 4910 for (int i = 0; i < NumParamList; i++) { 4911 TemplateParameterList* Params = D->getTemplateParameterList(i); 4912 for (TemplateParameterList::iterator Param = Params->begin(), 4913 ParamEnd = Params->end(); 4914 Param != ParamEnd; ++Param) { 4915 NamedDecl *Named = cast<NamedDecl>(*Param); 4916 if (Named->getDeclName()) { 4917 S->AddDecl(Named); 4918 IdResolver.AddDecl(Named); 4919 } 4920 } 4921 } 4922} 4923 4924void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4925 if (!D) 4926 return; 4927 4928 TemplateParameterList *Params = 0; 4929 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4930 Params = Template->getTemplateParameters(); 4931 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4932 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4933 Params = PartialSpec->getTemplateParameters(); 4934 else 4935 return; 4936 4937 for (TemplateParameterList::iterator Param = Params->begin(), 4938 ParamEnd = Params->end(); 4939 Param != ParamEnd; ++Param) { 4940 NamedDecl *Named = cast<NamedDecl>(*Param); 4941 if (Named->getDeclName()) { 4942 S->AddDecl(Named); 4943 IdResolver.AddDecl(Named); 4944 } 4945 } 4946} 4947 4948void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4949 if (!RecordD) return; 4950 AdjustDeclIfTemplate(RecordD); 4951 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4952 PushDeclContext(S, Record); 4953} 4954 4955void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4956 if (!RecordD) return; 4957 PopDeclContext(); 4958} 4959 4960/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4961/// parsing a top-level (non-nested) C++ class, and we are now 4962/// parsing those parts of the given Method declaration that could 4963/// not be parsed earlier (C++ [class.mem]p2), such as default 4964/// arguments. This action should enter the scope of the given 4965/// Method declaration as if we had just parsed the qualified method 4966/// name. However, it should not bring the parameters into scope; 4967/// that will be performed by ActOnDelayedCXXMethodParameter. 4968void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4969} 4970 4971/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4972/// C++ method declaration. We're (re-)introducing the given 4973/// function parameter into scope for use in parsing later parts of 4974/// the method declaration. For example, we could see an 4975/// ActOnParamDefaultArgument event for this parameter. 4976void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4977 if (!ParamD) 4978 return; 4979 4980 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4981 4982 // If this parameter has an unparsed default argument, clear it out 4983 // to make way for the parsed default argument. 4984 if (Param->hasUnparsedDefaultArg()) 4985 Param->setDefaultArg(0); 4986 4987 S->AddDecl(Param); 4988 if (Param->getDeclName()) 4989 IdResolver.AddDecl(Param); 4990} 4991 4992/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4993/// processing the delayed method declaration for Method. The method 4994/// declaration is now considered finished. There may be a separate 4995/// ActOnStartOfFunctionDef action later (not necessarily 4996/// immediately!) for this method, if it was also defined inside the 4997/// class body. 4998void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4999 if (!MethodD) 5000 return; 5001 5002 AdjustDeclIfTemplate(MethodD); 5003 5004 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5005 5006 // Now that we have our default arguments, check the constructor 5007 // again. It could produce additional diagnostics or affect whether 5008 // the class has implicitly-declared destructors, among other 5009 // things. 5010 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5011 CheckConstructor(Constructor); 5012 5013 // Check the default arguments, which we may have added. 5014 if (!Method->isInvalidDecl()) 5015 CheckCXXDefaultArguments(Method); 5016} 5017 5018/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5019/// the well-formedness of the constructor declarator @p D with type @p 5020/// R. If there are any errors in the declarator, this routine will 5021/// emit diagnostics and set the invalid bit to true. In any case, the type 5022/// will be updated to reflect a well-formed type for the constructor and 5023/// returned. 5024QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5025 StorageClass &SC) { 5026 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5027 5028 // C++ [class.ctor]p3: 5029 // A constructor shall not be virtual (10.3) or static (9.4). A 5030 // constructor can be invoked for a const, volatile or const 5031 // volatile object. A constructor shall not be declared const, 5032 // volatile, or const volatile (9.3.2). 5033 if (isVirtual) { 5034 if (!D.isInvalidType()) 5035 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5036 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5037 << SourceRange(D.getIdentifierLoc()); 5038 D.setInvalidType(); 5039 } 5040 if (SC == SC_Static) { 5041 if (!D.isInvalidType()) 5042 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5043 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5044 << SourceRange(D.getIdentifierLoc()); 5045 D.setInvalidType(); 5046 SC = SC_None; 5047 } 5048 5049 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5050 if (FTI.TypeQuals != 0) { 5051 if (FTI.TypeQuals & Qualifiers::Const) 5052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5053 << "const" << SourceRange(D.getIdentifierLoc()); 5054 if (FTI.TypeQuals & Qualifiers::Volatile) 5055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5056 << "volatile" << SourceRange(D.getIdentifierLoc()); 5057 if (FTI.TypeQuals & Qualifiers::Restrict) 5058 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5059 << "restrict" << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 } 5062 5063 // C++0x [class.ctor]p4: 5064 // A constructor shall not be declared with a ref-qualifier. 5065 if (FTI.hasRefQualifier()) { 5066 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5067 << FTI.RefQualifierIsLValueRef 5068 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5069 D.setInvalidType(); 5070 } 5071 5072 // Rebuild the function type "R" without any type qualifiers (in 5073 // case any of the errors above fired) and with "void" as the 5074 // return type, since constructors don't have return types. 5075 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5076 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5077 return R; 5078 5079 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5080 EPI.TypeQuals = 0; 5081 EPI.RefQualifier = RQ_None; 5082 5083 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5084 Proto->getNumArgs(), EPI); 5085} 5086 5087/// CheckConstructor - Checks a fully-formed constructor for 5088/// well-formedness, issuing any diagnostics required. Returns true if 5089/// the constructor declarator is invalid. 5090void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5091 CXXRecordDecl *ClassDecl 5092 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5093 if (!ClassDecl) 5094 return Constructor->setInvalidDecl(); 5095 5096 // C++ [class.copy]p3: 5097 // A declaration of a constructor for a class X is ill-formed if 5098 // its first parameter is of type (optionally cv-qualified) X and 5099 // either there are no other parameters or else all other 5100 // parameters have default arguments. 5101 if (!Constructor->isInvalidDecl() && 5102 ((Constructor->getNumParams() == 1) || 5103 (Constructor->getNumParams() > 1 && 5104 Constructor->getParamDecl(1)->hasDefaultArg())) && 5105 Constructor->getTemplateSpecializationKind() 5106 != TSK_ImplicitInstantiation) { 5107 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5108 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5109 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5110 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5111 const char *ConstRef 5112 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5113 : " const &"; 5114 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5115 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5116 5117 // FIXME: Rather that making the constructor invalid, we should endeavor 5118 // to fix the type. 5119 Constructor->setInvalidDecl(); 5120 } 5121 } 5122} 5123 5124/// CheckDestructor - Checks a fully-formed destructor definition for 5125/// well-formedness, issuing any diagnostics required. Returns true 5126/// on error. 5127bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5128 CXXRecordDecl *RD = Destructor->getParent(); 5129 5130 if (Destructor->isVirtual()) { 5131 SourceLocation Loc; 5132 5133 if (!Destructor->isImplicit()) 5134 Loc = Destructor->getLocation(); 5135 else 5136 Loc = RD->getLocation(); 5137 5138 // If we have a virtual destructor, look up the deallocation function 5139 FunctionDecl *OperatorDelete = 0; 5140 DeclarationName Name = 5141 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5142 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5143 return true; 5144 5145 MarkDeclarationReferenced(Loc, OperatorDelete); 5146 5147 Destructor->setOperatorDelete(OperatorDelete); 5148 } 5149 5150 return false; 5151} 5152 5153static inline bool 5154FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5155 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5156 FTI.ArgInfo[0].Param && 5157 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5158} 5159 5160/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5161/// the well-formednes of the destructor declarator @p D with type @p 5162/// R. If there are any errors in the declarator, this routine will 5163/// emit diagnostics and set the declarator to invalid. Even if this happens, 5164/// will be updated to reflect a well-formed type for the destructor and 5165/// returned. 5166QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5167 StorageClass& SC) { 5168 // C++ [class.dtor]p1: 5169 // [...] A typedef-name that names a class is a class-name 5170 // (7.1.3); however, a typedef-name that names a class shall not 5171 // be used as the identifier in the declarator for a destructor 5172 // declaration. 5173 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5174 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5175 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5176 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5177 else if (const TemplateSpecializationType *TST = 5178 DeclaratorType->getAs<TemplateSpecializationType>()) 5179 if (TST->isTypeAlias()) 5180 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5181 << DeclaratorType << 1; 5182 5183 // C++ [class.dtor]p2: 5184 // A destructor is used to destroy objects of its class type. A 5185 // destructor takes no parameters, and no return type can be 5186 // specified for it (not even void). The address of a destructor 5187 // shall not be taken. A destructor shall not be static. A 5188 // destructor can be invoked for a const, volatile or const 5189 // volatile object. A destructor shall not be declared const, 5190 // volatile or const volatile (9.3.2). 5191 if (SC == SC_Static) { 5192 if (!D.isInvalidType()) 5193 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5194 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5195 << SourceRange(D.getIdentifierLoc()) 5196 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5197 5198 SC = SC_None; 5199 } 5200 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5201 // Destructors don't have return types, but the parser will 5202 // happily parse something like: 5203 // 5204 // class X { 5205 // float ~X(); 5206 // }; 5207 // 5208 // The return type will be eliminated later. 5209 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5210 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5211 << SourceRange(D.getIdentifierLoc()); 5212 } 5213 5214 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5215 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5216 if (FTI.TypeQuals & Qualifiers::Const) 5217 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5218 << "const" << SourceRange(D.getIdentifierLoc()); 5219 if (FTI.TypeQuals & Qualifiers::Volatile) 5220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5221 << "volatile" << SourceRange(D.getIdentifierLoc()); 5222 if (FTI.TypeQuals & Qualifiers::Restrict) 5223 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5224 << "restrict" << SourceRange(D.getIdentifierLoc()); 5225 D.setInvalidType(); 5226 } 5227 5228 // C++0x [class.dtor]p2: 5229 // A destructor shall not be declared with a ref-qualifier. 5230 if (FTI.hasRefQualifier()) { 5231 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5232 << FTI.RefQualifierIsLValueRef 5233 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5234 D.setInvalidType(); 5235 } 5236 5237 // Make sure we don't have any parameters. 5238 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5239 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5240 5241 // Delete the parameters. 5242 FTI.freeArgs(); 5243 D.setInvalidType(); 5244 } 5245 5246 // Make sure the destructor isn't variadic. 5247 if (FTI.isVariadic) { 5248 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5249 D.setInvalidType(); 5250 } 5251 5252 // Rebuild the function type "R" without any type qualifiers or 5253 // parameters (in case any of the errors above fired) and with 5254 // "void" as the return type, since destructors don't have return 5255 // types. 5256 if (!D.isInvalidType()) 5257 return R; 5258 5259 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5260 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5261 EPI.Variadic = false; 5262 EPI.TypeQuals = 0; 5263 EPI.RefQualifier = RQ_None; 5264 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5265} 5266 5267/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5268/// well-formednes of the conversion function declarator @p D with 5269/// type @p R. If there are any errors in the declarator, this routine 5270/// will emit diagnostics and return true. Otherwise, it will return 5271/// false. Either way, the type @p R will be updated to reflect a 5272/// well-formed type for the conversion operator. 5273void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5274 StorageClass& SC) { 5275 // C++ [class.conv.fct]p1: 5276 // Neither parameter types nor return type can be specified. The 5277 // type of a conversion function (8.3.5) is "function taking no 5278 // parameter returning conversion-type-id." 5279 if (SC == SC_Static) { 5280 if (!D.isInvalidType()) 5281 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5282 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5283 << SourceRange(D.getIdentifierLoc()); 5284 D.setInvalidType(); 5285 SC = SC_None; 5286 } 5287 5288 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5289 5290 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5291 // Conversion functions don't have return types, but the parser will 5292 // happily parse something like: 5293 // 5294 // class X { 5295 // float operator bool(); 5296 // }; 5297 // 5298 // The return type will be changed later anyway. 5299 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5300 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5301 << SourceRange(D.getIdentifierLoc()); 5302 D.setInvalidType(); 5303 } 5304 5305 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5306 5307 // Make sure we don't have any parameters. 5308 if (Proto->getNumArgs() > 0) { 5309 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5310 5311 // Delete the parameters. 5312 D.getFunctionTypeInfo().freeArgs(); 5313 D.setInvalidType(); 5314 } else if (Proto->isVariadic()) { 5315 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5316 D.setInvalidType(); 5317 } 5318 5319 // Diagnose "&operator bool()" and other such nonsense. This 5320 // is actually a gcc extension which we don't support. 5321 if (Proto->getResultType() != ConvType) { 5322 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5323 << Proto->getResultType(); 5324 D.setInvalidType(); 5325 ConvType = Proto->getResultType(); 5326 } 5327 5328 // C++ [class.conv.fct]p4: 5329 // The conversion-type-id shall not represent a function type nor 5330 // an array type. 5331 if (ConvType->isArrayType()) { 5332 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5333 ConvType = Context.getPointerType(ConvType); 5334 D.setInvalidType(); 5335 } else if (ConvType->isFunctionType()) { 5336 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5337 ConvType = Context.getPointerType(ConvType); 5338 D.setInvalidType(); 5339 } 5340 5341 // Rebuild the function type "R" without any parameters (in case any 5342 // of the errors above fired) and with the conversion type as the 5343 // return type. 5344 if (D.isInvalidType()) 5345 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5346 5347 // C++0x explicit conversion operators. 5348 if (D.getDeclSpec().isExplicitSpecified()) 5349 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5350 getLangOptions().CPlusPlus0x ? 5351 diag::warn_cxx98_compat_explicit_conversion_functions : 5352 diag::ext_explicit_conversion_functions) 5353 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5354} 5355 5356/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5357/// the declaration of the given C++ conversion function. This routine 5358/// is responsible for recording the conversion function in the C++ 5359/// class, if possible. 5360Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5361 assert(Conversion && "Expected to receive a conversion function declaration"); 5362 5363 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5364 5365 // Make sure we aren't redeclaring the conversion function. 5366 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5367 5368 // C++ [class.conv.fct]p1: 5369 // [...] A conversion function is never used to convert a 5370 // (possibly cv-qualified) object to the (possibly cv-qualified) 5371 // same object type (or a reference to it), to a (possibly 5372 // cv-qualified) base class of that type (or a reference to it), 5373 // or to (possibly cv-qualified) void. 5374 // FIXME: Suppress this warning if the conversion function ends up being a 5375 // virtual function that overrides a virtual function in a base class. 5376 QualType ClassType 5377 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5378 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5379 ConvType = ConvTypeRef->getPointeeType(); 5380 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5381 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5382 /* Suppress diagnostics for instantiations. */; 5383 else if (ConvType->isRecordType()) { 5384 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5385 if (ConvType == ClassType) 5386 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5387 << ClassType; 5388 else if (IsDerivedFrom(ClassType, ConvType)) 5389 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5390 << ClassType << ConvType; 5391 } else if (ConvType->isVoidType()) { 5392 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5393 << ClassType << ConvType; 5394 } 5395 5396 if (FunctionTemplateDecl *ConversionTemplate 5397 = Conversion->getDescribedFunctionTemplate()) 5398 return ConversionTemplate; 5399 5400 return Conversion; 5401} 5402 5403//===----------------------------------------------------------------------===// 5404// Namespace Handling 5405//===----------------------------------------------------------------------===// 5406 5407 5408 5409/// ActOnStartNamespaceDef - This is called at the start of a namespace 5410/// definition. 5411Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5412 SourceLocation InlineLoc, 5413 SourceLocation NamespaceLoc, 5414 SourceLocation IdentLoc, 5415 IdentifierInfo *II, 5416 SourceLocation LBrace, 5417 AttributeList *AttrList) { 5418 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5419 // For anonymous namespace, take the location of the left brace. 5420 SourceLocation Loc = II ? IdentLoc : LBrace; 5421 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5422 StartLoc, Loc, II); 5423 Namespc->setInline(InlineLoc.isValid()); 5424 5425 Scope *DeclRegionScope = NamespcScope->getParent(); 5426 5427 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5428 5429 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5430 PushNamespaceVisibilityAttr(Attr); 5431 5432 if (II) { 5433 // C++ [namespace.def]p2: 5434 // The identifier in an original-namespace-definition shall not 5435 // have been previously defined in the declarative region in 5436 // which the original-namespace-definition appears. The 5437 // identifier in an original-namespace-definition is the name of 5438 // the namespace. Subsequently in that declarative region, it is 5439 // treated as an original-namespace-name. 5440 // 5441 // Since namespace names are unique in their scope, and we don't 5442 // look through using directives, just look for any ordinary names. 5443 5444 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5445 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5446 Decl::IDNS_Namespace; 5447 NamedDecl *PrevDecl = 0; 5448 for (DeclContext::lookup_result R 5449 = CurContext->getRedeclContext()->lookup(II); 5450 R.first != R.second; ++R.first) { 5451 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5452 PrevDecl = *R.first; 5453 break; 5454 } 5455 } 5456 5457 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5458 // This is an extended namespace definition. 5459 if (Namespc->isInline() != OrigNS->isInline()) { 5460 // inline-ness must match 5461 if (OrigNS->isInline()) { 5462 // The user probably just forgot the 'inline', so suggest that it 5463 // be added back. 5464 Diag(Namespc->getLocation(), 5465 diag::warn_inline_namespace_reopened_noninline) 5466 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5467 } else { 5468 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5469 << Namespc->isInline(); 5470 } 5471 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5472 5473 // Recover by ignoring the new namespace's inline status. 5474 Namespc->setInline(OrigNS->isInline()); 5475 } 5476 5477 // Attach this namespace decl to the chain of extended namespace 5478 // definitions. 5479 OrigNS->setNextNamespace(Namespc); 5480 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5481 5482 // Remove the previous declaration from the scope. 5483 if (DeclRegionScope->isDeclScope(OrigNS)) { 5484 IdResolver.RemoveDecl(OrigNS); 5485 DeclRegionScope->RemoveDecl(OrigNS); 5486 } 5487 } else if (PrevDecl) { 5488 // This is an invalid name redefinition. 5489 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5490 << Namespc->getDeclName(); 5491 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5492 Namespc->setInvalidDecl(); 5493 // Continue on to push Namespc as current DeclContext and return it. 5494 } else if (II->isStr("std") && 5495 CurContext->getRedeclContext()->isTranslationUnit()) { 5496 // This is the first "real" definition of the namespace "std", so update 5497 // our cache of the "std" namespace to point at this definition. 5498 if (NamespaceDecl *StdNS = getStdNamespace()) { 5499 // We had already defined a dummy namespace "std". Link this new 5500 // namespace definition to the dummy namespace "std". 5501 StdNS->setNextNamespace(Namespc); 5502 StdNS->setLocation(IdentLoc); 5503 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5504 } 5505 5506 // Make our StdNamespace cache point at the first real definition of the 5507 // "std" namespace. 5508 StdNamespace = Namespc; 5509 5510 // Add this instance of "std" to the set of known namespaces 5511 KnownNamespaces[Namespc] = false; 5512 } else if (!Namespc->isInline()) { 5513 // Since this is an "original" namespace, add it to the known set of 5514 // namespaces if it is not an inline namespace. 5515 KnownNamespaces[Namespc] = false; 5516 } 5517 5518 PushOnScopeChains(Namespc, DeclRegionScope); 5519 } else { 5520 // Anonymous namespaces. 5521 assert(Namespc->isAnonymousNamespace()); 5522 5523 // Link the anonymous namespace into its parent. 5524 NamespaceDecl *PrevDecl; 5525 DeclContext *Parent = CurContext->getRedeclContext(); 5526 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5527 PrevDecl = TU->getAnonymousNamespace(); 5528 TU->setAnonymousNamespace(Namespc); 5529 } else { 5530 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5531 PrevDecl = ND->getAnonymousNamespace(); 5532 ND->setAnonymousNamespace(Namespc); 5533 } 5534 5535 // Link the anonymous namespace with its previous declaration. 5536 if (PrevDecl) { 5537 assert(PrevDecl->isAnonymousNamespace()); 5538 assert(!PrevDecl->getNextNamespace()); 5539 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5540 PrevDecl->setNextNamespace(Namespc); 5541 5542 if (Namespc->isInline() != PrevDecl->isInline()) { 5543 // inline-ness must match 5544 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5545 << Namespc->isInline(); 5546 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5547 Namespc->setInvalidDecl(); 5548 // Recover by ignoring the new namespace's inline status. 5549 Namespc->setInline(PrevDecl->isInline()); 5550 } 5551 } 5552 5553 CurContext->addDecl(Namespc); 5554 5555 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5556 // behaves as if it were replaced by 5557 // namespace unique { /* empty body */ } 5558 // using namespace unique; 5559 // namespace unique { namespace-body } 5560 // where all occurrences of 'unique' in a translation unit are 5561 // replaced by the same identifier and this identifier differs 5562 // from all other identifiers in the entire program. 5563 5564 // We just create the namespace with an empty name and then add an 5565 // implicit using declaration, just like the standard suggests. 5566 // 5567 // CodeGen enforces the "universally unique" aspect by giving all 5568 // declarations semantically contained within an anonymous 5569 // namespace internal linkage. 5570 5571 if (!PrevDecl) { 5572 UsingDirectiveDecl* UD 5573 = UsingDirectiveDecl::Create(Context, CurContext, 5574 /* 'using' */ LBrace, 5575 /* 'namespace' */ SourceLocation(), 5576 /* qualifier */ NestedNameSpecifierLoc(), 5577 /* identifier */ SourceLocation(), 5578 Namespc, 5579 /* Ancestor */ CurContext); 5580 UD->setImplicit(); 5581 CurContext->addDecl(UD); 5582 } 5583 } 5584 5585 // Although we could have an invalid decl (i.e. the namespace name is a 5586 // redefinition), push it as current DeclContext and try to continue parsing. 5587 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5588 // for the namespace has the declarations that showed up in that particular 5589 // namespace definition. 5590 PushDeclContext(NamespcScope, Namespc); 5591 return Namespc; 5592} 5593 5594/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5595/// is a namespace alias, returns the namespace it points to. 5596static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5597 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5598 return AD->getNamespace(); 5599 return dyn_cast_or_null<NamespaceDecl>(D); 5600} 5601 5602/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5603/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5604void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5605 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5606 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5607 Namespc->setRBraceLoc(RBrace); 5608 PopDeclContext(); 5609 if (Namespc->hasAttr<VisibilityAttr>()) 5610 PopPragmaVisibility(); 5611} 5612 5613CXXRecordDecl *Sema::getStdBadAlloc() const { 5614 return cast_or_null<CXXRecordDecl>( 5615 StdBadAlloc.get(Context.getExternalSource())); 5616} 5617 5618NamespaceDecl *Sema::getStdNamespace() const { 5619 return cast_or_null<NamespaceDecl>( 5620 StdNamespace.get(Context.getExternalSource())); 5621} 5622 5623/// \brief Retrieve the special "std" namespace, which may require us to 5624/// implicitly define the namespace. 5625NamespaceDecl *Sema::getOrCreateStdNamespace() { 5626 if (!StdNamespace) { 5627 // The "std" namespace has not yet been defined, so build one implicitly. 5628 StdNamespace = NamespaceDecl::Create(Context, 5629 Context.getTranslationUnitDecl(), 5630 SourceLocation(), SourceLocation(), 5631 &PP.getIdentifierTable().get("std")); 5632 getStdNamespace()->setImplicit(true); 5633 } 5634 5635 return getStdNamespace(); 5636} 5637 5638/// \brief Determine whether a using statement is in a context where it will be 5639/// apply in all contexts. 5640static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5641 switch (CurContext->getDeclKind()) { 5642 case Decl::TranslationUnit: 5643 return true; 5644 case Decl::LinkageSpec: 5645 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5646 default: 5647 return false; 5648 } 5649} 5650 5651static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5652 CXXScopeSpec &SS, 5653 SourceLocation IdentLoc, 5654 IdentifierInfo *Ident) { 5655 R.clear(); 5656 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5657 R.getLookupKind(), Sc, &SS, NULL, 5658 false, S.CTC_NoKeywords, NULL)) { 5659 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5660 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5661 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5662 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5663 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5664 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5665 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5666 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5667 else 5668 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5669 << Ident << CorrectedQuotedStr 5670 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5671 5672 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5673 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5674 5675 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5676 R.addDecl(Corrected.getCorrectionDecl()); 5677 return true; 5678 } 5679 R.setLookupName(Ident); 5680 } 5681 return false; 5682} 5683 5684Decl *Sema::ActOnUsingDirective(Scope *S, 5685 SourceLocation UsingLoc, 5686 SourceLocation NamespcLoc, 5687 CXXScopeSpec &SS, 5688 SourceLocation IdentLoc, 5689 IdentifierInfo *NamespcName, 5690 AttributeList *AttrList) { 5691 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5692 assert(NamespcName && "Invalid NamespcName."); 5693 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5694 5695 // This can only happen along a recovery path. 5696 while (S->getFlags() & Scope::TemplateParamScope) 5697 S = S->getParent(); 5698 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5699 5700 UsingDirectiveDecl *UDir = 0; 5701 NestedNameSpecifier *Qualifier = 0; 5702 if (SS.isSet()) 5703 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5704 5705 // Lookup namespace name. 5706 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5707 LookupParsedName(R, S, &SS); 5708 if (R.isAmbiguous()) 5709 return 0; 5710 5711 if (R.empty()) { 5712 R.clear(); 5713 // Allow "using namespace std;" or "using namespace ::std;" even if 5714 // "std" hasn't been defined yet, for GCC compatibility. 5715 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5716 NamespcName->isStr("std")) { 5717 Diag(IdentLoc, diag::ext_using_undefined_std); 5718 R.addDecl(getOrCreateStdNamespace()); 5719 R.resolveKind(); 5720 } 5721 // Otherwise, attempt typo correction. 5722 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5723 } 5724 5725 if (!R.empty()) { 5726 NamedDecl *Named = R.getFoundDecl(); 5727 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5728 && "expected namespace decl"); 5729 // C++ [namespace.udir]p1: 5730 // A using-directive specifies that the names in the nominated 5731 // namespace can be used in the scope in which the 5732 // using-directive appears after the using-directive. During 5733 // unqualified name lookup (3.4.1), the names appear as if they 5734 // were declared in the nearest enclosing namespace which 5735 // contains both the using-directive and the nominated 5736 // namespace. [Note: in this context, "contains" means "contains 5737 // directly or indirectly". ] 5738 5739 // Find enclosing context containing both using-directive and 5740 // nominated namespace. 5741 NamespaceDecl *NS = getNamespaceDecl(Named); 5742 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5743 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5744 CommonAncestor = CommonAncestor->getParent(); 5745 5746 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5747 SS.getWithLocInContext(Context), 5748 IdentLoc, Named, CommonAncestor); 5749 5750 if (IsUsingDirectiveInToplevelContext(CurContext) && 5751 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5752 Diag(IdentLoc, diag::warn_using_directive_in_header); 5753 } 5754 5755 PushUsingDirective(S, UDir); 5756 } else { 5757 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5758 } 5759 5760 // FIXME: We ignore attributes for now. 5761 return UDir; 5762} 5763 5764void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5765 // If scope has associated entity, then using directive is at namespace 5766 // or translation unit scope. We add UsingDirectiveDecls, into 5767 // it's lookup structure. 5768 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5769 Ctx->addDecl(UDir); 5770 else 5771 // Otherwise it is block-sope. using-directives will affect lookup 5772 // only to the end of scope. 5773 S->PushUsingDirective(UDir); 5774} 5775 5776 5777Decl *Sema::ActOnUsingDeclaration(Scope *S, 5778 AccessSpecifier AS, 5779 bool HasUsingKeyword, 5780 SourceLocation UsingLoc, 5781 CXXScopeSpec &SS, 5782 UnqualifiedId &Name, 5783 AttributeList *AttrList, 5784 bool IsTypeName, 5785 SourceLocation TypenameLoc) { 5786 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5787 5788 switch (Name.getKind()) { 5789 case UnqualifiedId::IK_ImplicitSelfParam: 5790 case UnqualifiedId::IK_Identifier: 5791 case UnqualifiedId::IK_OperatorFunctionId: 5792 case UnqualifiedId::IK_LiteralOperatorId: 5793 case UnqualifiedId::IK_ConversionFunctionId: 5794 break; 5795 5796 case UnqualifiedId::IK_ConstructorName: 5797 case UnqualifiedId::IK_ConstructorTemplateId: 5798 // C++0x inherited constructors. 5799 Diag(Name.getSourceRange().getBegin(), 5800 getLangOptions().CPlusPlus0x ? 5801 diag::warn_cxx98_compat_using_decl_constructor : 5802 diag::err_using_decl_constructor) 5803 << SS.getRange(); 5804 5805 if (getLangOptions().CPlusPlus0x) break; 5806 5807 return 0; 5808 5809 case UnqualifiedId::IK_DestructorName: 5810 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5811 << SS.getRange(); 5812 return 0; 5813 5814 case UnqualifiedId::IK_TemplateId: 5815 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5816 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5817 return 0; 5818 } 5819 5820 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5821 DeclarationName TargetName = TargetNameInfo.getName(); 5822 if (!TargetName) 5823 return 0; 5824 5825 // Warn about using declarations. 5826 // TODO: store that the declaration was written without 'using' and 5827 // talk about access decls instead of using decls in the 5828 // diagnostics. 5829 if (!HasUsingKeyword) { 5830 UsingLoc = Name.getSourceRange().getBegin(); 5831 5832 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5833 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5834 } 5835 5836 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5837 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5838 return 0; 5839 5840 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5841 TargetNameInfo, AttrList, 5842 /* IsInstantiation */ false, 5843 IsTypeName, TypenameLoc); 5844 if (UD) 5845 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5846 5847 return UD; 5848} 5849 5850/// \brief Determine whether a using declaration considers the given 5851/// declarations as "equivalent", e.g., if they are redeclarations of 5852/// the same entity or are both typedefs of the same type. 5853static bool 5854IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5855 bool &SuppressRedeclaration) { 5856 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5857 SuppressRedeclaration = false; 5858 return true; 5859 } 5860 5861 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5862 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5863 SuppressRedeclaration = true; 5864 return Context.hasSameType(TD1->getUnderlyingType(), 5865 TD2->getUnderlyingType()); 5866 } 5867 5868 return false; 5869} 5870 5871 5872/// Determines whether to create a using shadow decl for a particular 5873/// decl, given the set of decls existing prior to this using lookup. 5874bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5875 const LookupResult &Previous) { 5876 // Diagnose finding a decl which is not from a base class of the 5877 // current class. We do this now because there are cases where this 5878 // function will silently decide not to build a shadow decl, which 5879 // will pre-empt further diagnostics. 5880 // 5881 // We don't need to do this in C++0x because we do the check once on 5882 // the qualifier. 5883 // 5884 // FIXME: diagnose the following if we care enough: 5885 // struct A { int foo; }; 5886 // struct B : A { using A::foo; }; 5887 // template <class T> struct C : A {}; 5888 // template <class T> struct D : C<T> { using B::foo; } // <--- 5889 // This is invalid (during instantiation) in C++03 because B::foo 5890 // resolves to the using decl in B, which is not a base class of D<T>. 5891 // We can't diagnose it immediately because C<T> is an unknown 5892 // specialization. The UsingShadowDecl in D<T> then points directly 5893 // to A::foo, which will look well-formed when we instantiate. 5894 // The right solution is to not collapse the shadow-decl chain. 5895 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5896 DeclContext *OrigDC = Orig->getDeclContext(); 5897 5898 // Handle enums and anonymous structs. 5899 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5900 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5901 while (OrigRec->isAnonymousStructOrUnion()) 5902 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5903 5904 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5905 if (OrigDC == CurContext) { 5906 Diag(Using->getLocation(), 5907 diag::err_using_decl_nested_name_specifier_is_current_class) 5908 << Using->getQualifierLoc().getSourceRange(); 5909 Diag(Orig->getLocation(), diag::note_using_decl_target); 5910 return true; 5911 } 5912 5913 Diag(Using->getQualifierLoc().getBeginLoc(), 5914 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5915 << Using->getQualifier() 5916 << cast<CXXRecordDecl>(CurContext) 5917 << Using->getQualifierLoc().getSourceRange(); 5918 Diag(Orig->getLocation(), diag::note_using_decl_target); 5919 return true; 5920 } 5921 } 5922 5923 if (Previous.empty()) return false; 5924 5925 NamedDecl *Target = Orig; 5926 if (isa<UsingShadowDecl>(Target)) 5927 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5928 5929 // If the target happens to be one of the previous declarations, we 5930 // don't have a conflict. 5931 // 5932 // FIXME: but we might be increasing its access, in which case we 5933 // should redeclare it. 5934 NamedDecl *NonTag = 0, *Tag = 0; 5935 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5936 I != E; ++I) { 5937 NamedDecl *D = (*I)->getUnderlyingDecl(); 5938 bool Result; 5939 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5940 return Result; 5941 5942 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5943 } 5944 5945 if (Target->isFunctionOrFunctionTemplate()) { 5946 FunctionDecl *FD; 5947 if (isa<FunctionTemplateDecl>(Target)) 5948 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5949 else 5950 FD = cast<FunctionDecl>(Target); 5951 5952 NamedDecl *OldDecl = 0; 5953 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5954 case Ovl_Overload: 5955 return false; 5956 5957 case Ovl_NonFunction: 5958 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5959 break; 5960 5961 // We found a decl with the exact signature. 5962 case Ovl_Match: 5963 // If we're in a record, we want to hide the target, so we 5964 // return true (without a diagnostic) to tell the caller not to 5965 // build a shadow decl. 5966 if (CurContext->isRecord()) 5967 return true; 5968 5969 // If we're not in a record, this is an error. 5970 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5971 break; 5972 } 5973 5974 Diag(Target->getLocation(), diag::note_using_decl_target); 5975 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5976 return true; 5977 } 5978 5979 // Target is not a function. 5980 5981 if (isa<TagDecl>(Target)) { 5982 // No conflict between a tag and a non-tag. 5983 if (!Tag) return false; 5984 5985 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5986 Diag(Target->getLocation(), diag::note_using_decl_target); 5987 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5988 return true; 5989 } 5990 5991 // No conflict between a tag and a non-tag. 5992 if (!NonTag) return false; 5993 5994 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5995 Diag(Target->getLocation(), diag::note_using_decl_target); 5996 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5997 return true; 5998} 5999 6000/// Builds a shadow declaration corresponding to a 'using' declaration. 6001UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6002 UsingDecl *UD, 6003 NamedDecl *Orig) { 6004 6005 // If we resolved to another shadow declaration, just coalesce them. 6006 NamedDecl *Target = Orig; 6007 if (isa<UsingShadowDecl>(Target)) { 6008 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6009 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6010 } 6011 6012 UsingShadowDecl *Shadow 6013 = UsingShadowDecl::Create(Context, CurContext, 6014 UD->getLocation(), UD, Target); 6015 UD->addShadowDecl(Shadow); 6016 6017 Shadow->setAccess(UD->getAccess()); 6018 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6019 Shadow->setInvalidDecl(); 6020 6021 if (S) 6022 PushOnScopeChains(Shadow, S); 6023 else 6024 CurContext->addDecl(Shadow); 6025 6026 6027 return Shadow; 6028} 6029 6030/// Hides a using shadow declaration. This is required by the current 6031/// using-decl implementation when a resolvable using declaration in a 6032/// class is followed by a declaration which would hide or override 6033/// one or more of the using decl's targets; for example: 6034/// 6035/// struct Base { void foo(int); }; 6036/// struct Derived : Base { 6037/// using Base::foo; 6038/// void foo(int); 6039/// }; 6040/// 6041/// The governing language is C++03 [namespace.udecl]p12: 6042/// 6043/// When a using-declaration brings names from a base class into a 6044/// derived class scope, member functions in the derived class 6045/// override and/or hide member functions with the same name and 6046/// parameter types in a base class (rather than conflicting). 6047/// 6048/// There are two ways to implement this: 6049/// (1) optimistically create shadow decls when they're not hidden 6050/// by existing declarations, or 6051/// (2) don't create any shadow decls (or at least don't make them 6052/// visible) until we've fully parsed/instantiated the class. 6053/// The problem with (1) is that we might have to retroactively remove 6054/// a shadow decl, which requires several O(n) operations because the 6055/// decl structures are (very reasonably) not designed for removal. 6056/// (2) avoids this but is very fiddly and phase-dependent. 6057void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6058 if (Shadow->getDeclName().getNameKind() == 6059 DeclarationName::CXXConversionFunctionName) 6060 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6061 6062 // Remove it from the DeclContext... 6063 Shadow->getDeclContext()->removeDecl(Shadow); 6064 6065 // ...and the scope, if applicable... 6066 if (S) { 6067 S->RemoveDecl(Shadow); 6068 IdResolver.RemoveDecl(Shadow); 6069 } 6070 6071 // ...and the using decl. 6072 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6073 6074 // TODO: complain somehow if Shadow was used. It shouldn't 6075 // be possible for this to happen, because...? 6076} 6077 6078/// Builds a using declaration. 6079/// 6080/// \param IsInstantiation - Whether this call arises from an 6081/// instantiation of an unresolved using declaration. We treat 6082/// the lookup differently for these declarations. 6083NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6084 SourceLocation UsingLoc, 6085 CXXScopeSpec &SS, 6086 const DeclarationNameInfo &NameInfo, 6087 AttributeList *AttrList, 6088 bool IsInstantiation, 6089 bool IsTypeName, 6090 SourceLocation TypenameLoc) { 6091 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6092 SourceLocation IdentLoc = NameInfo.getLoc(); 6093 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6094 6095 // FIXME: We ignore attributes for now. 6096 6097 if (SS.isEmpty()) { 6098 Diag(IdentLoc, diag::err_using_requires_qualname); 6099 return 0; 6100 } 6101 6102 // Do the redeclaration lookup in the current scope. 6103 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6104 ForRedeclaration); 6105 Previous.setHideTags(false); 6106 if (S) { 6107 LookupName(Previous, S); 6108 6109 // It is really dumb that we have to do this. 6110 LookupResult::Filter F = Previous.makeFilter(); 6111 while (F.hasNext()) { 6112 NamedDecl *D = F.next(); 6113 if (!isDeclInScope(D, CurContext, S)) 6114 F.erase(); 6115 } 6116 F.done(); 6117 } else { 6118 assert(IsInstantiation && "no scope in non-instantiation"); 6119 assert(CurContext->isRecord() && "scope not record in instantiation"); 6120 LookupQualifiedName(Previous, CurContext); 6121 } 6122 6123 // Check for invalid redeclarations. 6124 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6125 return 0; 6126 6127 // Check for bad qualifiers. 6128 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6129 return 0; 6130 6131 DeclContext *LookupContext = computeDeclContext(SS); 6132 NamedDecl *D; 6133 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6134 if (!LookupContext) { 6135 if (IsTypeName) { 6136 // FIXME: not all declaration name kinds are legal here 6137 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6138 UsingLoc, TypenameLoc, 6139 QualifierLoc, 6140 IdentLoc, NameInfo.getName()); 6141 } else { 6142 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6143 QualifierLoc, NameInfo); 6144 } 6145 } else { 6146 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6147 NameInfo, IsTypeName); 6148 } 6149 D->setAccess(AS); 6150 CurContext->addDecl(D); 6151 6152 if (!LookupContext) return D; 6153 UsingDecl *UD = cast<UsingDecl>(D); 6154 6155 if (RequireCompleteDeclContext(SS, LookupContext)) { 6156 UD->setInvalidDecl(); 6157 return UD; 6158 } 6159 6160 // Constructor inheriting using decls get special treatment. 6161 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6162 if (CheckInheritedConstructorUsingDecl(UD)) 6163 UD->setInvalidDecl(); 6164 return UD; 6165 } 6166 6167 // Otherwise, look up the target name. 6168 6169 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6170 6171 // Unlike most lookups, we don't always want to hide tag 6172 // declarations: tag names are visible through the using declaration 6173 // even if hidden by ordinary names, *except* in a dependent context 6174 // where it's important for the sanity of two-phase lookup. 6175 if (!IsInstantiation) 6176 R.setHideTags(false); 6177 6178 LookupQualifiedName(R, LookupContext); 6179 6180 if (R.empty()) { 6181 Diag(IdentLoc, diag::err_no_member) 6182 << NameInfo.getName() << LookupContext << SS.getRange(); 6183 UD->setInvalidDecl(); 6184 return UD; 6185 } 6186 6187 if (R.isAmbiguous()) { 6188 UD->setInvalidDecl(); 6189 return UD; 6190 } 6191 6192 if (IsTypeName) { 6193 // If we asked for a typename and got a non-type decl, error out. 6194 if (!R.getAsSingle<TypeDecl>()) { 6195 Diag(IdentLoc, diag::err_using_typename_non_type); 6196 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6197 Diag((*I)->getUnderlyingDecl()->getLocation(), 6198 diag::note_using_decl_target); 6199 UD->setInvalidDecl(); 6200 return UD; 6201 } 6202 } else { 6203 // If we asked for a non-typename and we got a type, error out, 6204 // but only if this is an instantiation of an unresolved using 6205 // decl. Otherwise just silently find the type name. 6206 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6207 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6208 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6209 UD->setInvalidDecl(); 6210 return UD; 6211 } 6212 } 6213 6214 // C++0x N2914 [namespace.udecl]p6: 6215 // A using-declaration shall not name a namespace. 6216 if (R.getAsSingle<NamespaceDecl>()) { 6217 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6218 << SS.getRange(); 6219 UD->setInvalidDecl(); 6220 return UD; 6221 } 6222 6223 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6224 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6225 BuildUsingShadowDecl(S, UD, *I); 6226 } 6227 6228 return UD; 6229} 6230 6231/// Additional checks for a using declaration referring to a constructor name. 6232bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6233 if (UD->isTypeName()) { 6234 // FIXME: Cannot specify typename when specifying constructor 6235 return true; 6236 } 6237 6238 const Type *SourceType = UD->getQualifier()->getAsType(); 6239 assert(SourceType && 6240 "Using decl naming constructor doesn't have type in scope spec."); 6241 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6242 6243 // Check whether the named type is a direct base class. 6244 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6245 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6246 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6247 BaseIt != BaseE; ++BaseIt) { 6248 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6249 if (CanonicalSourceType == BaseType) 6250 break; 6251 } 6252 6253 if (BaseIt == BaseE) { 6254 // Did not find SourceType in the bases. 6255 Diag(UD->getUsingLocation(), 6256 diag::err_using_decl_constructor_not_in_direct_base) 6257 << UD->getNameInfo().getSourceRange() 6258 << QualType(SourceType, 0) << TargetClass; 6259 return true; 6260 } 6261 6262 BaseIt->setInheritConstructors(); 6263 6264 return false; 6265} 6266 6267/// Checks that the given using declaration is not an invalid 6268/// redeclaration. Note that this is checking only for the using decl 6269/// itself, not for any ill-formedness among the UsingShadowDecls. 6270bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6271 bool isTypeName, 6272 const CXXScopeSpec &SS, 6273 SourceLocation NameLoc, 6274 const LookupResult &Prev) { 6275 // C++03 [namespace.udecl]p8: 6276 // C++0x [namespace.udecl]p10: 6277 // A using-declaration is a declaration and can therefore be used 6278 // repeatedly where (and only where) multiple declarations are 6279 // allowed. 6280 // 6281 // That's in non-member contexts. 6282 if (!CurContext->getRedeclContext()->isRecord()) 6283 return false; 6284 6285 NestedNameSpecifier *Qual 6286 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6287 6288 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6289 NamedDecl *D = *I; 6290 6291 bool DTypename; 6292 NestedNameSpecifier *DQual; 6293 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6294 DTypename = UD->isTypeName(); 6295 DQual = UD->getQualifier(); 6296 } else if (UnresolvedUsingValueDecl *UD 6297 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6298 DTypename = false; 6299 DQual = UD->getQualifier(); 6300 } else if (UnresolvedUsingTypenameDecl *UD 6301 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6302 DTypename = true; 6303 DQual = UD->getQualifier(); 6304 } else continue; 6305 6306 // using decls differ if one says 'typename' and the other doesn't. 6307 // FIXME: non-dependent using decls? 6308 if (isTypeName != DTypename) continue; 6309 6310 // using decls differ if they name different scopes (but note that 6311 // template instantiation can cause this check to trigger when it 6312 // didn't before instantiation). 6313 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6314 Context.getCanonicalNestedNameSpecifier(DQual)) 6315 continue; 6316 6317 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6318 Diag(D->getLocation(), diag::note_using_decl) << 1; 6319 return true; 6320 } 6321 6322 return false; 6323} 6324 6325 6326/// Checks that the given nested-name qualifier used in a using decl 6327/// in the current context is appropriately related to the current 6328/// scope. If an error is found, diagnoses it and returns true. 6329bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6330 const CXXScopeSpec &SS, 6331 SourceLocation NameLoc) { 6332 DeclContext *NamedContext = computeDeclContext(SS); 6333 6334 if (!CurContext->isRecord()) { 6335 // C++03 [namespace.udecl]p3: 6336 // C++0x [namespace.udecl]p8: 6337 // A using-declaration for a class member shall be a member-declaration. 6338 6339 // If we weren't able to compute a valid scope, it must be a 6340 // dependent class scope. 6341 if (!NamedContext || NamedContext->isRecord()) { 6342 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6343 << SS.getRange(); 6344 return true; 6345 } 6346 6347 // Otherwise, everything is known to be fine. 6348 return false; 6349 } 6350 6351 // The current scope is a record. 6352 6353 // If the named context is dependent, we can't decide much. 6354 if (!NamedContext) { 6355 // FIXME: in C++0x, we can diagnose if we can prove that the 6356 // nested-name-specifier does not refer to a base class, which is 6357 // still possible in some cases. 6358 6359 // Otherwise we have to conservatively report that things might be 6360 // okay. 6361 return false; 6362 } 6363 6364 if (!NamedContext->isRecord()) { 6365 // Ideally this would point at the last name in the specifier, 6366 // but we don't have that level of source info. 6367 Diag(SS.getRange().getBegin(), 6368 diag::err_using_decl_nested_name_specifier_is_not_class) 6369 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6370 return true; 6371 } 6372 6373 if (!NamedContext->isDependentContext() && 6374 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6375 return true; 6376 6377 if (getLangOptions().CPlusPlus0x) { 6378 // C++0x [namespace.udecl]p3: 6379 // In a using-declaration used as a member-declaration, the 6380 // nested-name-specifier shall name a base class of the class 6381 // being defined. 6382 6383 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6384 cast<CXXRecordDecl>(NamedContext))) { 6385 if (CurContext == NamedContext) { 6386 Diag(NameLoc, 6387 diag::err_using_decl_nested_name_specifier_is_current_class) 6388 << SS.getRange(); 6389 return true; 6390 } 6391 6392 Diag(SS.getRange().getBegin(), 6393 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6394 << (NestedNameSpecifier*) SS.getScopeRep() 6395 << cast<CXXRecordDecl>(CurContext) 6396 << SS.getRange(); 6397 return true; 6398 } 6399 6400 return false; 6401 } 6402 6403 // C++03 [namespace.udecl]p4: 6404 // A using-declaration used as a member-declaration shall refer 6405 // to a member of a base class of the class being defined [etc.]. 6406 6407 // Salient point: SS doesn't have to name a base class as long as 6408 // lookup only finds members from base classes. Therefore we can 6409 // diagnose here only if we can prove that that can't happen, 6410 // i.e. if the class hierarchies provably don't intersect. 6411 6412 // TODO: it would be nice if "definitely valid" results were cached 6413 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6414 // need to be repeated. 6415 6416 struct UserData { 6417 llvm::DenseSet<const CXXRecordDecl*> Bases; 6418 6419 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6420 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6421 Data->Bases.insert(Base); 6422 return true; 6423 } 6424 6425 bool hasDependentBases(const CXXRecordDecl *Class) { 6426 return !Class->forallBases(collect, this); 6427 } 6428 6429 /// Returns true if the base is dependent or is one of the 6430 /// accumulated base classes. 6431 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6432 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6433 return !Data->Bases.count(Base); 6434 } 6435 6436 bool mightShareBases(const CXXRecordDecl *Class) { 6437 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6438 } 6439 }; 6440 6441 UserData Data; 6442 6443 // Returns false if we find a dependent base. 6444 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6445 return false; 6446 6447 // Returns false if the class has a dependent base or if it or one 6448 // of its bases is present in the base set of the current context. 6449 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6450 return false; 6451 6452 Diag(SS.getRange().getBegin(), 6453 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6454 << (NestedNameSpecifier*) SS.getScopeRep() 6455 << cast<CXXRecordDecl>(CurContext) 6456 << SS.getRange(); 6457 6458 return true; 6459} 6460 6461Decl *Sema::ActOnAliasDeclaration(Scope *S, 6462 AccessSpecifier AS, 6463 MultiTemplateParamsArg TemplateParamLists, 6464 SourceLocation UsingLoc, 6465 UnqualifiedId &Name, 6466 TypeResult Type) { 6467 // Skip up to the relevant declaration scope. 6468 while (S->getFlags() & Scope::TemplateParamScope) 6469 S = S->getParent(); 6470 assert((S->getFlags() & Scope::DeclScope) && 6471 "got alias-declaration outside of declaration scope"); 6472 6473 if (Type.isInvalid()) 6474 return 0; 6475 6476 bool Invalid = false; 6477 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6478 TypeSourceInfo *TInfo = 0; 6479 GetTypeFromParser(Type.get(), &TInfo); 6480 6481 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6482 return 0; 6483 6484 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6485 UPPC_DeclarationType)) { 6486 Invalid = true; 6487 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6488 TInfo->getTypeLoc().getBeginLoc()); 6489 } 6490 6491 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6492 LookupName(Previous, S); 6493 6494 // Warn about shadowing the name of a template parameter. 6495 if (Previous.isSingleResult() && 6496 Previous.getFoundDecl()->isTemplateParameter()) { 6497 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6498 Previous.clear(); 6499 } 6500 6501 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6502 "name in alias declaration must be an identifier"); 6503 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6504 Name.StartLocation, 6505 Name.Identifier, TInfo); 6506 6507 NewTD->setAccess(AS); 6508 6509 if (Invalid) 6510 NewTD->setInvalidDecl(); 6511 6512 CheckTypedefForVariablyModifiedType(S, NewTD); 6513 Invalid |= NewTD->isInvalidDecl(); 6514 6515 bool Redeclaration = false; 6516 6517 NamedDecl *NewND; 6518 if (TemplateParamLists.size()) { 6519 TypeAliasTemplateDecl *OldDecl = 0; 6520 TemplateParameterList *OldTemplateParams = 0; 6521 6522 if (TemplateParamLists.size() != 1) { 6523 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6524 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6525 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6526 } 6527 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6528 6529 // Only consider previous declarations in the same scope. 6530 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6531 /*ExplicitInstantiationOrSpecialization*/false); 6532 if (!Previous.empty()) { 6533 Redeclaration = true; 6534 6535 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6536 if (!OldDecl && !Invalid) { 6537 Diag(UsingLoc, diag::err_redefinition_different_kind) 6538 << Name.Identifier; 6539 6540 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6541 if (OldD->getLocation().isValid()) 6542 Diag(OldD->getLocation(), diag::note_previous_definition); 6543 6544 Invalid = true; 6545 } 6546 6547 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6548 if (TemplateParameterListsAreEqual(TemplateParams, 6549 OldDecl->getTemplateParameters(), 6550 /*Complain=*/true, 6551 TPL_TemplateMatch)) 6552 OldTemplateParams = OldDecl->getTemplateParameters(); 6553 else 6554 Invalid = true; 6555 6556 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6557 if (!Invalid && 6558 !Context.hasSameType(OldTD->getUnderlyingType(), 6559 NewTD->getUnderlyingType())) { 6560 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6561 // but we can't reasonably accept it. 6562 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6563 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6564 if (OldTD->getLocation().isValid()) 6565 Diag(OldTD->getLocation(), diag::note_previous_definition); 6566 Invalid = true; 6567 } 6568 } 6569 } 6570 6571 // Merge any previous default template arguments into our parameters, 6572 // and check the parameter list. 6573 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6574 TPC_TypeAliasTemplate)) 6575 return 0; 6576 6577 TypeAliasTemplateDecl *NewDecl = 6578 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6579 Name.Identifier, TemplateParams, 6580 NewTD); 6581 6582 NewDecl->setAccess(AS); 6583 6584 if (Invalid) 6585 NewDecl->setInvalidDecl(); 6586 else if (OldDecl) 6587 NewDecl->setPreviousDeclaration(OldDecl); 6588 6589 NewND = NewDecl; 6590 } else { 6591 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6592 NewND = NewTD; 6593 } 6594 6595 if (!Redeclaration) 6596 PushOnScopeChains(NewND, S); 6597 6598 return NewND; 6599} 6600 6601Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6602 SourceLocation NamespaceLoc, 6603 SourceLocation AliasLoc, 6604 IdentifierInfo *Alias, 6605 CXXScopeSpec &SS, 6606 SourceLocation IdentLoc, 6607 IdentifierInfo *Ident) { 6608 6609 // Lookup the namespace name. 6610 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6611 LookupParsedName(R, S, &SS); 6612 6613 // Check if we have a previous declaration with the same name. 6614 NamedDecl *PrevDecl 6615 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6616 ForRedeclaration); 6617 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6618 PrevDecl = 0; 6619 6620 if (PrevDecl) { 6621 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6622 // We already have an alias with the same name that points to the same 6623 // namespace, so don't create a new one. 6624 // FIXME: At some point, we'll want to create the (redundant) 6625 // declaration to maintain better source information. 6626 if (!R.isAmbiguous() && !R.empty() && 6627 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6628 return 0; 6629 } 6630 6631 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6632 diag::err_redefinition_different_kind; 6633 Diag(AliasLoc, DiagID) << Alias; 6634 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6635 return 0; 6636 } 6637 6638 if (R.isAmbiguous()) 6639 return 0; 6640 6641 if (R.empty()) { 6642 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6643 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6644 return 0; 6645 } 6646 } 6647 6648 NamespaceAliasDecl *AliasDecl = 6649 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6650 Alias, SS.getWithLocInContext(Context), 6651 IdentLoc, R.getFoundDecl()); 6652 6653 PushOnScopeChains(AliasDecl, S); 6654 return AliasDecl; 6655} 6656 6657namespace { 6658 /// \brief Scoped object used to handle the state changes required in Sema 6659 /// to implicitly define the body of a C++ member function; 6660 class ImplicitlyDefinedFunctionScope { 6661 Sema &S; 6662 Sema::ContextRAII SavedContext; 6663 6664 public: 6665 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6666 : S(S), SavedContext(S, Method) 6667 { 6668 S.PushFunctionScope(); 6669 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6670 } 6671 6672 ~ImplicitlyDefinedFunctionScope() { 6673 S.PopExpressionEvaluationContext(); 6674 S.PopFunctionOrBlockScope(); 6675 } 6676 }; 6677} 6678 6679Sema::ImplicitExceptionSpecification 6680Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6681 // C++ [except.spec]p14: 6682 // An implicitly declared special member function (Clause 12) shall have an 6683 // exception-specification. [...] 6684 ImplicitExceptionSpecification ExceptSpec(Context); 6685 if (ClassDecl->isInvalidDecl()) 6686 return ExceptSpec; 6687 6688 // Direct base-class constructors. 6689 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6690 BEnd = ClassDecl->bases_end(); 6691 B != BEnd; ++B) { 6692 if (B->isVirtual()) // Handled below. 6693 continue; 6694 6695 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6696 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6697 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6698 // If this is a deleted function, add it anyway. This might be conformant 6699 // with the standard. This might not. I'm not sure. It might not matter. 6700 if (Constructor) 6701 ExceptSpec.CalledDecl(Constructor); 6702 } 6703 } 6704 6705 // Virtual base-class constructors. 6706 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6707 BEnd = ClassDecl->vbases_end(); 6708 B != BEnd; ++B) { 6709 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6710 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6711 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6712 // If this is a deleted function, add it anyway. This might be conformant 6713 // with the standard. This might not. I'm not sure. It might not matter. 6714 if (Constructor) 6715 ExceptSpec.CalledDecl(Constructor); 6716 } 6717 } 6718 6719 // Field constructors. 6720 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6721 FEnd = ClassDecl->field_end(); 6722 F != FEnd; ++F) { 6723 if (F->hasInClassInitializer()) { 6724 if (Expr *E = F->getInClassInitializer()) 6725 ExceptSpec.CalledExpr(E); 6726 else if (!F->isInvalidDecl()) 6727 ExceptSpec.SetDelayed(); 6728 } else if (const RecordType *RecordTy 6729 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6730 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6731 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6732 // If this is a deleted function, add it anyway. This might be conformant 6733 // with the standard. This might not. I'm not sure. It might not matter. 6734 // In particular, the problem is that this function never gets called. It 6735 // might just be ill-formed because this function attempts to refer to 6736 // a deleted function here. 6737 if (Constructor) 6738 ExceptSpec.CalledDecl(Constructor); 6739 } 6740 } 6741 6742 return ExceptSpec; 6743} 6744 6745CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6746 CXXRecordDecl *ClassDecl) { 6747 // C++ [class.ctor]p5: 6748 // A default constructor for a class X is a constructor of class X 6749 // that can be called without an argument. If there is no 6750 // user-declared constructor for class X, a default constructor is 6751 // implicitly declared. An implicitly-declared default constructor 6752 // is an inline public member of its class. 6753 assert(!ClassDecl->hasUserDeclaredConstructor() && 6754 "Should not build implicit default constructor!"); 6755 6756 ImplicitExceptionSpecification Spec = 6757 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6758 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6759 6760 // Create the actual constructor declaration. 6761 CanQualType ClassType 6762 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6763 SourceLocation ClassLoc = ClassDecl->getLocation(); 6764 DeclarationName Name 6765 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6766 DeclarationNameInfo NameInfo(Name, ClassLoc); 6767 CXXConstructorDecl *DefaultCon 6768 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6769 Context.getFunctionType(Context.VoidTy, 6770 0, 0, EPI), 6771 /*TInfo=*/0, 6772 /*isExplicit=*/false, 6773 /*isInline=*/true, 6774 /*isImplicitlyDeclared=*/true, 6775 // FIXME: apply the rules for definitions here 6776 /*isConstexpr=*/false); 6777 DefaultCon->setAccess(AS_public); 6778 DefaultCon->setDefaulted(); 6779 DefaultCon->setImplicit(); 6780 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6781 6782 // Note that we have declared this constructor. 6783 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6784 6785 if (Scope *S = getScopeForContext(ClassDecl)) 6786 PushOnScopeChains(DefaultCon, S, false); 6787 ClassDecl->addDecl(DefaultCon); 6788 6789 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6790 DefaultCon->setDeletedAsWritten(); 6791 6792 return DefaultCon; 6793} 6794 6795void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6796 CXXConstructorDecl *Constructor) { 6797 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6798 !Constructor->doesThisDeclarationHaveABody() && 6799 !Constructor->isDeleted()) && 6800 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6801 6802 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6803 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6804 6805 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6806 DiagnosticErrorTrap Trap(Diags); 6807 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6808 Trap.hasErrorOccurred()) { 6809 Diag(CurrentLocation, diag::note_member_synthesized_at) 6810 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6811 Constructor->setInvalidDecl(); 6812 return; 6813 } 6814 6815 SourceLocation Loc = Constructor->getLocation(); 6816 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6817 6818 Constructor->setUsed(); 6819 MarkVTableUsed(CurrentLocation, ClassDecl); 6820 6821 if (ASTMutationListener *L = getASTMutationListener()) { 6822 L->CompletedImplicitDefinition(Constructor); 6823 } 6824} 6825 6826/// Get any existing defaulted default constructor for the given class. Do not 6827/// implicitly define one if it does not exist. 6828static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6829 CXXRecordDecl *D) { 6830 ASTContext &Context = Self.Context; 6831 QualType ClassType = Context.getTypeDeclType(D); 6832 DeclarationName ConstructorName 6833 = Context.DeclarationNames.getCXXConstructorName( 6834 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6835 6836 DeclContext::lookup_const_iterator Con, ConEnd; 6837 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6838 Con != ConEnd; ++Con) { 6839 // A function template cannot be defaulted. 6840 if (isa<FunctionTemplateDecl>(*Con)) 6841 continue; 6842 6843 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6844 if (Constructor->isDefaultConstructor()) 6845 return Constructor->isDefaulted() ? Constructor : 0; 6846 } 6847 return 0; 6848} 6849 6850void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6851 if (!D) return; 6852 AdjustDeclIfTemplate(D); 6853 6854 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6855 CXXConstructorDecl *CtorDecl 6856 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6857 6858 if (!CtorDecl) return; 6859 6860 // Compute the exception specification for the default constructor. 6861 const FunctionProtoType *CtorTy = 6862 CtorDecl->getType()->castAs<FunctionProtoType>(); 6863 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6864 ImplicitExceptionSpecification Spec = 6865 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6866 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6867 assert(EPI.ExceptionSpecType != EST_Delayed); 6868 6869 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6870 } 6871 6872 // If the default constructor is explicitly defaulted, checking the exception 6873 // specification is deferred until now. 6874 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6875 !ClassDecl->isDependentType()) 6876 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6877} 6878 6879void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6880 // We start with an initial pass over the base classes to collect those that 6881 // inherit constructors from. If there are none, we can forgo all further 6882 // processing. 6883 typedef SmallVector<const RecordType *, 4> BasesVector; 6884 BasesVector BasesToInheritFrom; 6885 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6886 BaseE = ClassDecl->bases_end(); 6887 BaseIt != BaseE; ++BaseIt) { 6888 if (BaseIt->getInheritConstructors()) { 6889 QualType Base = BaseIt->getType(); 6890 if (Base->isDependentType()) { 6891 // If we inherit constructors from anything that is dependent, just 6892 // abort processing altogether. We'll get another chance for the 6893 // instantiations. 6894 return; 6895 } 6896 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6897 } 6898 } 6899 if (BasesToInheritFrom.empty()) 6900 return; 6901 6902 // Now collect the constructors that we already have in the current class. 6903 // Those take precedence over inherited constructors. 6904 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6905 // unless there is a user-declared constructor with the same signature in 6906 // the class where the using-declaration appears. 6907 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6908 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6909 CtorE = ClassDecl->ctor_end(); 6910 CtorIt != CtorE; ++CtorIt) { 6911 ExistingConstructors.insert( 6912 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6913 } 6914 6915 Scope *S = getScopeForContext(ClassDecl); 6916 DeclarationName CreatedCtorName = 6917 Context.DeclarationNames.getCXXConstructorName( 6918 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6919 6920 // Now comes the true work. 6921 // First, we keep a map from constructor types to the base that introduced 6922 // them. Needed for finding conflicting constructors. We also keep the 6923 // actually inserted declarations in there, for pretty diagnostics. 6924 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6925 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6926 ConstructorToSourceMap InheritedConstructors; 6927 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6928 BaseE = BasesToInheritFrom.end(); 6929 BaseIt != BaseE; ++BaseIt) { 6930 const RecordType *Base = *BaseIt; 6931 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6932 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6933 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6934 CtorE = BaseDecl->ctor_end(); 6935 CtorIt != CtorE; ++CtorIt) { 6936 // Find the using declaration for inheriting this base's constructors. 6937 DeclarationName Name = 6938 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6939 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6940 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6941 SourceLocation UsingLoc = UD ? UD->getLocation() : 6942 ClassDecl->getLocation(); 6943 6944 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6945 // from the class X named in the using-declaration consists of actual 6946 // constructors and notional constructors that result from the 6947 // transformation of defaulted parameters as follows: 6948 // - all non-template default constructors of X, and 6949 // - for each non-template constructor of X that has at least one 6950 // parameter with a default argument, the set of constructors that 6951 // results from omitting any ellipsis parameter specification and 6952 // successively omitting parameters with a default argument from the 6953 // end of the parameter-type-list. 6954 CXXConstructorDecl *BaseCtor = *CtorIt; 6955 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6956 const FunctionProtoType *BaseCtorType = 6957 BaseCtor->getType()->getAs<FunctionProtoType>(); 6958 6959 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6960 maxParams = BaseCtor->getNumParams(); 6961 params <= maxParams; ++params) { 6962 // Skip default constructors. They're never inherited. 6963 if (params == 0) 6964 continue; 6965 // Skip copy and move constructors for the same reason. 6966 if (CanBeCopyOrMove && params == 1) 6967 continue; 6968 6969 // Build up a function type for this particular constructor. 6970 // FIXME: The working paper does not consider that the exception spec 6971 // for the inheriting constructor might be larger than that of the 6972 // source. This code doesn't yet, either. When it does, this code will 6973 // need to be delayed until after exception specifications and in-class 6974 // member initializers are attached. 6975 const Type *NewCtorType; 6976 if (params == maxParams) 6977 NewCtorType = BaseCtorType; 6978 else { 6979 SmallVector<QualType, 16> Args; 6980 for (unsigned i = 0; i < params; ++i) { 6981 Args.push_back(BaseCtorType->getArgType(i)); 6982 } 6983 FunctionProtoType::ExtProtoInfo ExtInfo = 6984 BaseCtorType->getExtProtoInfo(); 6985 ExtInfo.Variadic = false; 6986 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6987 Args.data(), params, ExtInfo) 6988 .getTypePtr(); 6989 } 6990 const Type *CanonicalNewCtorType = 6991 Context.getCanonicalType(NewCtorType); 6992 6993 // Now that we have the type, first check if the class already has a 6994 // constructor with this signature. 6995 if (ExistingConstructors.count(CanonicalNewCtorType)) 6996 continue; 6997 6998 // Then we check if we have already declared an inherited constructor 6999 // with this signature. 7000 std::pair<ConstructorToSourceMap::iterator, bool> result = 7001 InheritedConstructors.insert(std::make_pair( 7002 CanonicalNewCtorType, 7003 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7004 if (!result.second) { 7005 // Already in the map. If it came from a different class, that's an 7006 // error. Not if it's from the same. 7007 CanQualType PreviousBase = result.first->second.first; 7008 if (CanonicalBase != PreviousBase) { 7009 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7010 const CXXConstructorDecl *PrevBaseCtor = 7011 PrevCtor->getInheritedConstructor(); 7012 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7013 7014 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7015 Diag(BaseCtor->getLocation(), 7016 diag::note_using_decl_constructor_conflict_current_ctor); 7017 Diag(PrevBaseCtor->getLocation(), 7018 diag::note_using_decl_constructor_conflict_previous_ctor); 7019 Diag(PrevCtor->getLocation(), 7020 diag::note_using_decl_constructor_conflict_previous_using); 7021 } 7022 continue; 7023 } 7024 7025 // OK, we're there, now add the constructor. 7026 // C++0x [class.inhctor]p8: [...] that would be performed by a 7027 // user-written inline constructor [...] 7028 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7029 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7030 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7031 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7032 /*ImplicitlyDeclared=*/true, 7033 // FIXME: Due to a defect in the standard, we treat inherited 7034 // constructors as constexpr even if that makes them ill-formed. 7035 /*Constexpr=*/BaseCtor->isConstexpr()); 7036 NewCtor->setAccess(BaseCtor->getAccess()); 7037 7038 // Build up the parameter decls and add them. 7039 SmallVector<ParmVarDecl *, 16> ParamDecls; 7040 for (unsigned i = 0; i < params; ++i) { 7041 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7042 UsingLoc, UsingLoc, 7043 /*IdentifierInfo=*/0, 7044 BaseCtorType->getArgType(i), 7045 /*TInfo=*/0, SC_None, 7046 SC_None, /*DefaultArg=*/0)); 7047 } 7048 NewCtor->setParams(ParamDecls); 7049 NewCtor->setInheritedConstructor(BaseCtor); 7050 7051 PushOnScopeChains(NewCtor, S, false); 7052 ClassDecl->addDecl(NewCtor); 7053 result.first->second.second = NewCtor; 7054 } 7055 } 7056 } 7057} 7058 7059Sema::ImplicitExceptionSpecification 7060Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7061 // C++ [except.spec]p14: 7062 // An implicitly declared special member function (Clause 12) shall have 7063 // an exception-specification. 7064 ImplicitExceptionSpecification ExceptSpec(Context); 7065 if (ClassDecl->isInvalidDecl()) 7066 return ExceptSpec; 7067 7068 // Direct base-class destructors. 7069 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7070 BEnd = ClassDecl->bases_end(); 7071 B != BEnd; ++B) { 7072 if (B->isVirtual()) // Handled below. 7073 continue; 7074 7075 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7076 ExceptSpec.CalledDecl( 7077 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7078 } 7079 7080 // Virtual base-class destructors. 7081 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7082 BEnd = ClassDecl->vbases_end(); 7083 B != BEnd; ++B) { 7084 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7085 ExceptSpec.CalledDecl( 7086 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7087 } 7088 7089 // Field destructors. 7090 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7091 FEnd = ClassDecl->field_end(); 7092 F != FEnd; ++F) { 7093 if (const RecordType *RecordTy 7094 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7095 ExceptSpec.CalledDecl( 7096 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7097 } 7098 7099 return ExceptSpec; 7100} 7101 7102CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7103 // C++ [class.dtor]p2: 7104 // If a class has no user-declared destructor, a destructor is 7105 // declared implicitly. An implicitly-declared destructor is an 7106 // inline public member of its class. 7107 7108 ImplicitExceptionSpecification Spec = 7109 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7110 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7111 7112 // Create the actual destructor declaration. 7113 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7114 7115 CanQualType ClassType 7116 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7117 SourceLocation ClassLoc = ClassDecl->getLocation(); 7118 DeclarationName Name 7119 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7120 DeclarationNameInfo NameInfo(Name, ClassLoc); 7121 CXXDestructorDecl *Destructor 7122 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7123 /*isInline=*/true, 7124 /*isImplicitlyDeclared=*/true); 7125 Destructor->setAccess(AS_public); 7126 Destructor->setDefaulted(); 7127 Destructor->setImplicit(); 7128 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7129 7130 // Note that we have declared this destructor. 7131 ++ASTContext::NumImplicitDestructorsDeclared; 7132 7133 // Introduce this destructor into its scope. 7134 if (Scope *S = getScopeForContext(ClassDecl)) 7135 PushOnScopeChains(Destructor, S, false); 7136 ClassDecl->addDecl(Destructor); 7137 7138 // This could be uniqued if it ever proves significant. 7139 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7140 7141 if (ShouldDeleteDestructor(Destructor)) 7142 Destructor->setDeletedAsWritten(); 7143 7144 AddOverriddenMethods(ClassDecl, Destructor); 7145 7146 return Destructor; 7147} 7148 7149void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7150 CXXDestructorDecl *Destructor) { 7151 assert((Destructor->isDefaulted() && 7152 !Destructor->doesThisDeclarationHaveABody()) && 7153 "DefineImplicitDestructor - call it for implicit default dtor"); 7154 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7155 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7156 7157 if (Destructor->isInvalidDecl()) 7158 return; 7159 7160 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7161 7162 DiagnosticErrorTrap Trap(Diags); 7163 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7164 Destructor->getParent()); 7165 7166 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7167 Diag(CurrentLocation, diag::note_member_synthesized_at) 7168 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7169 7170 Destructor->setInvalidDecl(); 7171 return; 7172 } 7173 7174 SourceLocation Loc = Destructor->getLocation(); 7175 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7176 Destructor->setImplicitlyDefined(true); 7177 Destructor->setUsed(); 7178 MarkVTableUsed(CurrentLocation, ClassDecl); 7179 7180 if (ASTMutationListener *L = getASTMutationListener()) { 7181 L->CompletedImplicitDefinition(Destructor); 7182 } 7183} 7184 7185void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7186 CXXDestructorDecl *destructor) { 7187 // C++11 [class.dtor]p3: 7188 // A declaration of a destructor that does not have an exception- 7189 // specification is implicitly considered to have the same exception- 7190 // specification as an implicit declaration. 7191 const FunctionProtoType *dtorType = destructor->getType()-> 7192 getAs<FunctionProtoType>(); 7193 if (dtorType->hasExceptionSpec()) 7194 return; 7195 7196 ImplicitExceptionSpecification exceptSpec = 7197 ComputeDefaultedDtorExceptionSpec(classDecl); 7198 7199 // Replace the destructor's type, building off the existing one. Fortunately, 7200 // the only thing of interest in the destructor type is its extended info. 7201 // The return and arguments are fixed. 7202 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7203 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7204 epi.NumExceptions = exceptSpec.size(); 7205 epi.Exceptions = exceptSpec.data(); 7206 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7207 7208 destructor->setType(ty); 7209 7210 // FIXME: If the destructor has a body that could throw, and the newly created 7211 // spec doesn't allow exceptions, we should emit a warning, because this 7212 // change in behavior can break conforming C++03 programs at runtime. 7213 // However, we don't have a body yet, so it needs to be done somewhere else. 7214} 7215 7216/// \brief Builds a statement that copies/moves the given entity from \p From to 7217/// \c To. 7218/// 7219/// This routine is used to copy/move the members of a class with an 7220/// implicitly-declared copy/move assignment operator. When the entities being 7221/// copied are arrays, this routine builds for loops to copy them. 7222/// 7223/// \param S The Sema object used for type-checking. 7224/// 7225/// \param Loc The location where the implicit copy/move is being generated. 7226/// 7227/// \param T The type of the expressions being copied/moved. Both expressions 7228/// must have this type. 7229/// 7230/// \param To The expression we are copying/moving to. 7231/// 7232/// \param From The expression we are copying/moving from. 7233/// 7234/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7235/// Otherwise, it's a non-static member subobject. 7236/// 7237/// \param Copying Whether we're copying or moving. 7238/// 7239/// \param Depth Internal parameter recording the depth of the recursion. 7240/// 7241/// \returns A statement or a loop that copies the expressions. 7242static StmtResult 7243BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7244 Expr *To, Expr *From, 7245 bool CopyingBaseSubobject, bool Copying, 7246 unsigned Depth = 0) { 7247 // C++0x [class.copy]p28: 7248 // Each subobject is assigned in the manner appropriate to its type: 7249 // 7250 // - if the subobject is of class type, as if by a call to operator= with 7251 // the subobject as the object expression and the corresponding 7252 // subobject of x as a single function argument (as if by explicit 7253 // qualification; that is, ignoring any possible virtual overriding 7254 // functions in more derived classes); 7255 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7256 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7257 7258 // Look for operator=. 7259 DeclarationName Name 7260 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7261 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7262 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7263 7264 // Filter out any result that isn't a copy/move-assignment operator. 7265 LookupResult::Filter F = OpLookup.makeFilter(); 7266 while (F.hasNext()) { 7267 NamedDecl *D = F.next(); 7268 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7269 if (Copying ? Method->isCopyAssignmentOperator() : 7270 Method->isMoveAssignmentOperator()) 7271 continue; 7272 7273 F.erase(); 7274 } 7275 F.done(); 7276 7277 // Suppress the protected check (C++ [class.protected]) for each of the 7278 // assignment operators we found. This strange dance is required when 7279 // we're assigning via a base classes's copy-assignment operator. To 7280 // ensure that we're getting the right base class subobject (without 7281 // ambiguities), we need to cast "this" to that subobject type; to 7282 // ensure that we don't go through the virtual call mechanism, we need 7283 // to qualify the operator= name with the base class (see below). However, 7284 // this means that if the base class has a protected copy assignment 7285 // operator, the protected member access check will fail. So, we 7286 // rewrite "protected" access to "public" access in this case, since we 7287 // know by construction that we're calling from a derived class. 7288 if (CopyingBaseSubobject) { 7289 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7290 L != LEnd; ++L) { 7291 if (L.getAccess() == AS_protected) 7292 L.setAccess(AS_public); 7293 } 7294 } 7295 7296 // Create the nested-name-specifier that will be used to qualify the 7297 // reference to operator=; this is required to suppress the virtual 7298 // call mechanism. 7299 CXXScopeSpec SS; 7300 SS.MakeTrivial(S.Context, 7301 NestedNameSpecifier::Create(S.Context, 0, false, 7302 T.getTypePtr()), 7303 Loc); 7304 7305 // Create the reference to operator=. 7306 ExprResult OpEqualRef 7307 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7308 /*FirstQualifierInScope=*/0, OpLookup, 7309 /*TemplateArgs=*/0, 7310 /*SuppressQualifierCheck=*/true); 7311 if (OpEqualRef.isInvalid()) 7312 return StmtError(); 7313 7314 // Build the call to the assignment operator. 7315 7316 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7317 OpEqualRef.takeAs<Expr>(), 7318 Loc, &From, 1, Loc); 7319 if (Call.isInvalid()) 7320 return StmtError(); 7321 7322 return S.Owned(Call.takeAs<Stmt>()); 7323 } 7324 7325 // - if the subobject is of scalar type, the built-in assignment 7326 // operator is used. 7327 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7328 if (!ArrayTy) { 7329 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7330 if (Assignment.isInvalid()) 7331 return StmtError(); 7332 7333 return S.Owned(Assignment.takeAs<Stmt>()); 7334 } 7335 7336 // - if the subobject is an array, each element is assigned, in the 7337 // manner appropriate to the element type; 7338 7339 // Construct a loop over the array bounds, e.g., 7340 // 7341 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7342 // 7343 // that will copy each of the array elements. 7344 QualType SizeType = S.Context.getSizeType(); 7345 7346 // Create the iteration variable. 7347 IdentifierInfo *IterationVarName = 0; 7348 { 7349 llvm::SmallString<8> Str; 7350 llvm::raw_svector_ostream OS(Str); 7351 OS << "__i" << Depth; 7352 IterationVarName = &S.Context.Idents.get(OS.str()); 7353 } 7354 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7355 IterationVarName, SizeType, 7356 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7357 SC_None, SC_None); 7358 7359 // Initialize the iteration variable to zero. 7360 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7361 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7362 7363 // Create a reference to the iteration variable; we'll use this several 7364 // times throughout. 7365 Expr *IterationVarRef 7366 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7367 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7368 7369 // Create the DeclStmt that holds the iteration variable. 7370 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7371 7372 // Create the comparison against the array bound. 7373 llvm::APInt Upper 7374 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7375 Expr *Comparison 7376 = new (S.Context) BinaryOperator(IterationVarRef, 7377 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7378 BO_NE, S.Context.BoolTy, 7379 VK_RValue, OK_Ordinary, Loc); 7380 7381 // Create the pre-increment of the iteration variable. 7382 Expr *Increment 7383 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7384 VK_LValue, OK_Ordinary, Loc); 7385 7386 // Subscript the "from" and "to" expressions with the iteration variable. 7387 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7388 IterationVarRef, Loc)); 7389 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7390 IterationVarRef, Loc)); 7391 if (!Copying) // Cast to rvalue 7392 From = CastForMoving(S, From); 7393 7394 // Build the copy/move for an individual element of the array. 7395 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7396 To, From, CopyingBaseSubobject, 7397 Copying, Depth + 1); 7398 if (Copy.isInvalid()) 7399 return StmtError(); 7400 7401 // Construct the loop that copies all elements of this array. 7402 return S.ActOnForStmt(Loc, Loc, InitStmt, 7403 S.MakeFullExpr(Comparison), 7404 0, S.MakeFullExpr(Increment), 7405 Loc, Copy.take()); 7406} 7407 7408std::pair<Sema::ImplicitExceptionSpecification, bool> 7409Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7410 CXXRecordDecl *ClassDecl) { 7411 if (ClassDecl->isInvalidDecl()) 7412 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7413 7414 // C++ [class.copy]p10: 7415 // If the class definition does not explicitly declare a copy 7416 // assignment operator, one is declared implicitly. 7417 // The implicitly-defined copy assignment operator for a class X 7418 // will have the form 7419 // 7420 // X& X::operator=(const X&) 7421 // 7422 // if 7423 bool HasConstCopyAssignment = true; 7424 7425 // -- each direct base class B of X has a copy assignment operator 7426 // whose parameter is of type const B&, const volatile B& or B, 7427 // and 7428 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7429 BaseEnd = ClassDecl->bases_end(); 7430 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7431 // We'll handle this below 7432 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7433 continue; 7434 7435 assert(!Base->getType()->isDependentType() && 7436 "Cannot generate implicit members for class with dependent bases."); 7437 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7438 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7439 &HasConstCopyAssignment); 7440 } 7441 7442 // In C++11, the above citation has "or virtual" added 7443 if (LangOpts.CPlusPlus0x) { 7444 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7445 BaseEnd = ClassDecl->vbases_end(); 7446 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7447 assert(!Base->getType()->isDependentType() && 7448 "Cannot generate implicit members for class with dependent bases."); 7449 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7450 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7451 &HasConstCopyAssignment); 7452 } 7453 } 7454 7455 // -- for all the nonstatic data members of X that are of a class 7456 // type M (or array thereof), each such class type has a copy 7457 // assignment operator whose parameter is of type const M&, 7458 // const volatile M& or M. 7459 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7460 FieldEnd = ClassDecl->field_end(); 7461 HasConstCopyAssignment && Field != FieldEnd; 7462 ++Field) { 7463 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7464 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7465 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7466 &HasConstCopyAssignment); 7467 } 7468 } 7469 7470 // Otherwise, the implicitly declared copy assignment operator will 7471 // have the form 7472 // 7473 // X& X::operator=(X&) 7474 7475 // C++ [except.spec]p14: 7476 // An implicitly declared special member function (Clause 12) shall have an 7477 // exception-specification. [...] 7478 7479 // It is unspecified whether or not an implicit copy assignment operator 7480 // attempts to deduplicate calls to assignment operators of virtual bases are 7481 // made. As such, this exception specification is effectively unspecified. 7482 // Based on a similar decision made for constness in C++0x, we're erring on 7483 // the side of assuming such calls to be made regardless of whether they 7484 // actually happen. 7485 ImplicitExceptionSpecification ExceptSpec(Context); 7486 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7487 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7488 BaseEnd = ClassDecl->bases_end(); 7489 Base != BaseEnd; ++Base) { 7490 if (Base->isVirtual()) 7491 continue; 7492 7493 CXXRecordDecl *BaseClassDecl 7494 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7495 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7496 ArgQuals, false, 0)) 7497 ExceptSpec.CalledDecl(CopyAssign); 7498 } 7499 7500 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7501 BaseEnd = ClassDecl->vbases_end(); 7502 Base != BaseEnd; ++Base) { 7503 CXXRecordDecl *BaseClassDecl 7504 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7505 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7506 ArgQuals, false, 0)) 7507 ExceptSpec.CalledDecl(CopyAssign); 7508 } 7509 7510 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7511 FieldEnd = ClassDecl->field_end(); 7512 Field != FieldEnd; 7513 ++Field) { 7514 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7515 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7516 if (CXXMethodDecl *CopyAssign = 7517 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7518 ExceptSpec.CalledDecl(CopyAssign); 7519 } 7520 } 7521 7522 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7523} 7524 7525CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7526 // Note: The following rules are largely analoguous to the copy 7527 // constructor rules. Note that virtual bases are not taken into account 7528 // for determining the argument type of the operator. Note also that 7529 // operators taking an object instead of a reference are allowed. 7530 7531 ImplicitExceptionSpecification Spec(Context); 7532 bool Const; 7533 llvm::tie(Spec, Const) = 7534 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7535 7536 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7537 QualType RetType = Context.getLValueReferenceType(ArgType); 7538 if (Const) 7539 ArgType = ArgType.withConst(); 7540 ArgType = Context.getLValueReferenceType(ArgType); 7541 7542 // An implicitly-declared copy assignment operator is an inline public 7543 // member of its class. 7544 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7545 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7546 SourceLocation ClassLoc = ClassDecl->getLocation(); 7547 DeclarationNameInfo NameInfo(Name, ClassLoc); 7548 CXXMethodDecl *CopyAssignment 7549 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7550 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7551 /*TInfo=*/0, /*isStatic=*/false, 7552 /*StorageClassAsWritten=*/SC_None, 7553 /*isInline=*/true, /*isConstexpr=*/false, 7554 SourceLocation()); 7555 CopyAssignment->setAccess(AS_public); 7556 CopyAssignment->setDefaulted(); 7557 CopyAssignment->setImplicit(); 7558 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7559 7560 // Add the parameter to the operator. 7561 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7562 ClassLoc, ClassLoc, /*Id=*/0, 7563 ArgType, /*TInfo=*/0, 7564 SC_None, 7565 SC_None, 0); 7566 CopyAssignment->setParams(FromParam); 7567 7568 // Note that we have added this copy-assignment operator. 7569 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7570 7571 if (Scope *S = getScopeForContext(ClassDecl)) 7572 PushOnScopeChains(CopyAssignment, S, false); 7573 ClassDecl->addDecl(CopyAssignment); 7574 7575 // C++0x [class.copy]p18: 7576 // ... If the class definition declares a move constructor or move 7577 // assignment operator, the implicitly declared copy assignment operator is 7578 // defined as deleted; ... 7579 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7580 ClassDecl->hasUserDeclaredMoveAssignment() || 7581 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7582 CopyAssignment->setDeletedAsWritten(); 7583 7584 AddOverriddenMethods(ClassDecl, CopyAssignment); 7585 return CopyAssignment; 7586} 7587 7588void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7589 CXXMethodDecl *CopyAssignOperator) { 7590 assert((CopyAssignOperator->isDefaulted() && 7591 CopyAssignOperator->isOverloadedOperator() && 7592 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7593 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7594 "DefineImplicitCopyAssignment called for wrong function"); 7595 7596 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7597 7598 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7599 CopyAssignOperator->setInvalidDecl(); 7600 return; 7601 } 7602 7603 CopyAssignOperator->setUsed(); 7604 7605 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7606 DiagnosticErrorTrap Trap(Diags); 7607 7608 // C++0x [class.copy]p30: 7609 // The implicitly-defined or explicitly-defaulted copy assignment operator 7610 // for a non-union class X performs memberwise copy assignment of its 7611 // subobjects. The direct base classes of X are assigned first, in the 7612 // order of their declaration in the base-specifier-list, and then the 7613 // immediate non-static data members of X are assigned, in the order in 7614 // which they were declared in the class definition. 7615 7616 // The statements that form the synthesized function body. 7617 ASTOwningVector<Stmt*> Statements(*this); 7618 7619 // The parameter for the "other" object, which we are copying from. 7620 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7621 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7622 QualType OtherRefType = Other->getType(); 7623 if (const LValueReferenceType *OtherRef 7624 = OtherRefType->getAs<LValueReferenceType>()) { 7625 OtherRefType = OtherRef->getPointeeType(); 7626 OtherQuals = OtherRefType.getQualifiers(); 7627 } 7628 7629 // Our location for everything implicitly-generated. 7630 SourceLocation Loc = CopyAssignOperator->getLocation(); 7631 7632 // Construct a reference to the "other" object. We'll be using this 7633 // throughout the generated ASTs. 7634 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7635 assert(OtherRef && "Reference to parameter cannot fail!"); 7636 7637 // Construct the "this" pointer. We'll be using this throughout the generated 7638 // ASTs. 7639 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7640 assert(This && "Reference to this cannot fail!"); 7641 7642 // Assign base classes. 7643 bool Invalid = false; 7644 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7645 E = ClassDecl->bases_end(); Base != E; ++Base) { 7646 // Form the assignment: 7647 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7648 QualType BaseType = Base->getType().getUnqualifiedType(); 7649 if (!BaseType->isRecordType()) { 7650 Invalid = true; 7651 continue; 7652 } 7653 7654 CXXCastPath BasePath; 7655 BasePath.push_back(Base); 7656 7657 // Construct the "from" expression, which is an implicit cast to the 7658 // appropriately-qualified base type. 7659 Expr *From = OtherRef; 7660 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7661 CK_UncheckedDerivedToBase, 7662 VK_LValue, &BasePath).take(); 7663 7664 // Dereference "this". 7665 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7666 7667 // Implicitly cast "this" to the appropriately-qualified base type. 7668 To = ImpCastExprToType(To.take(), 7669 Context.getCVRQualifiedType(BaseType, 7670 CopyAssignOperator->getTypeQualifiers()), 7671 CK_UncheckedDerivedToBase, 7672 VK_LValue, &BasePath); 7673 7674 // Build the copy. 7675 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7676 To.get(), From, 7677 /*CopyingBaseSubobject=*/true, 7678 /*Copying=*/true); 7679 if (Copy.isInvalid()) { 7680 Diag(CurrentLocation, diag::note_member_synthesized_at) 7681 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7682 CopyAssignOperator->setInvalidDecl(); 7683 return; 7684 } 7685 7686 // Success! Record the copy. 7687 Statements.push_back(Copy.takeAs<Expr>()); 7688 } 7689 7690 // \brief Reference to the __builtin_memcpy function. 7691 Expr *BuiltinMemCpyRef = 0; 7692 // \brief Reference to the __builtin_objc_memmove_collectable function. 7693 Expr *CollectableMemCpyRef = 0; 7694 7695 // Assign non-static members. 7696 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7697 FieldEnd = ClassDecl->field_end(); 7698 Field != FieldEnd; ++Field) { 7699 if (Field->isUnnamedBitfield()) 7700 continue; 7701 7702 // Check for members of reference type; we can't copy those. 7703 if (Field->getType()->isReferenceType()) { 7704 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7705 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7706 Diag(Field->getLocation(), diag::note_declared_at); 7707 Diag(CurrentLocation, diag::note_member_synthesized_at) 7708 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7709 Invalid = true; 7710 continue; 7711 } 7712 7713 // Check for members of const-qualified, non-class type. 7714 QualType BaseType = Context.getBaseElementType(Field->getType()); 7715 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7716 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7717 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7718 Diag(Field->getLocation(), diag::note_declared_at); 7719 Diag(CurrentLocation, diag::note_member_synthesized_at) 7720 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7721 Invalid = true; 7722 continue; 7723 } 7724 7725 // Suppress assigning zero-width bitfields. 7726 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7727 continue; 7728 7729 QualType FieldType = Field->getType().getNonReferenceType(); 7730 if (FieldType->isIncompleteArrayType()) { 7731 assert(ClassDecl->hasFlexibleArrayMember() && 7732 "Incomplete array type is not valid"); 7733 continue; 7734 } 7735 7736 // Build references to the field in the object we're copying from and to. 7737 CXXScopeSpec SS; // Intentionally empty 7738 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7739 LookupMemberName); 7740 MemberLookup.addDecl(*Field); 7741 MemberLookup.resolveKind(); 7742 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7743 Loc, /*IsArrow=*/false, 7744 SS, 0, MemberLookup, 0); 7745 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7746 Loc, /*IsArrow=*/true, 7747 SS, 0, MemberLookup, 0); 7748 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7749 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7750 7751 // If the field should be copied with __builtin_memcpy rather than via 7752 // explicit assignments, do so. This optimization only applies for arrays 7753 // of scalars and arrays of class type with trivial copy-assignment 7754 // operators. 7755 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7756 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7757 // Compute the size of the memory buffer to be copied. 7758 QualType SizeType = Context.getSizeType(); 7759 llvm::APInt Size(Context.getTypeSize(SizeType), 7760 Context.getTypeSizeInChars(BaseType).getQuantity()); 7761 for (const ConstantArrayType *Array 7762 = Context.getAsConstantArrayType(FieldType); 7763 Array; 7764 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7765 llvm::APInt ArraySize 7766 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7767 Size *= ArraySize; 7768 } 7769 7770 // Take the address of the field references for "from" and "to". 7771 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7772 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7773 7774 bool NeedsCollectableMemCpy = 7775 (BaseType->isRecordType() && 7776 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7777 7778 if (NeedsCollectableMemCpy) { 7779 if (!CollectableMemCpyRef) { 7780 // Create a reference to the __builtin_objc_memmove_collectable function. 7781 LookupResult R(*this, 7782 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7783 Loc, LookupOrdinaryName); 7784 LookupName(R, TUScope, true); 7785 7786 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7787 if (!CollectableMemCpy) { 7788 // Something went horribly wrong earlier, and we will have 7789 // complained about it. 7790 Invalid = true; 7791 continue; 7792 } 7793 7794 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7795 CollectableMemCpy->getType(), 7796 VK_LValue, Loc, 0).take(); 7797 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7798 } 7799 } 7800 // Create a reference to the __builtin_memcpy builtin function. 7801 else if (!BuiltinMemCpyRef) { 7802 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7803 LookupOrdinaryName); 7804 LookupName(R, TUScope, true); 7805 7806 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7807 if (!BuiltinMemCpy) { 7808 // Something went horribly wrong earlier, and we will have complained 7809 // about it. 7810 Invalid = true; 7811 continue; 7812 } 7813 7814 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7815 BuiltinMemCpy->getType(), 7816 VK_LValue, Loc, 0).take(); 7817 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7818 } 7819 7820 ASTOwningVector<Expr*> CallArgs(*this); 7821 CallArgs.push_back(To.takeAs<Expr>()); 7822 CallArgs.push_back(From.takeAs<Expr>()); 7823 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7824 ExprResult Call = ExprError(); 7825 if (NeedsCollectableMemCpy) 7826 Call = ActOnCallExpr(/*Scope=*/0, 7827 CollectableMemCpyRef, 7828 Loc, move_arg(CallArgs), 7829 Loc); 7830 else 7831 Call = ActOnCallExpr(/*Scope=*/0, 7832 BuiltinMemCpyRef, 7833 Loc, move_arg(CallArgs), 7834 Loc); 7835 7836 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7837 Statements.push_back(Call.takeAs<Expr>()); 7838 continue; 7839 } 7840 7841 // Build the copy of this field. 7842 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7843 To.get(), From.get(), 7844 /*CopyingBaseSubobject=*/false, 7845 /*Copying=*/true); 7846 if (Copy.isInvalid()) { 7847 Diag(CurrentLocation, diag::note_member_synthesized_at) 7848 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7849 CopyAssignOperator->setInvalidDecl(); 7850 return; 7851 } 7852 7853 // Success! Record the copy. 7854 Statements.push_back(Copy.takeAs<Stmt>()); 7855 } 7856 7857 if (!Invalid) { 7858 // Add a "return *this;" 7859 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7860 7861 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7862 if (Return.isInvalid()) 7863 Invalid = true; 7864 else { 7865 Statements.push_back(Return.takeAs<Stmt>()); 7866 7867 if (Trap.hasErrorOccurred()) { 7868 Diag(CurrentLocation, diag::note_member_synthesized_at) 7869 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7870 Invalid = true; 7871 } 7872 } 7873 } 7874 7875 if (Invalid) { 7876 CopyAssignOperator->setInvalidDecl(); 7877 return; 7878 } 7879 7880 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7881 /*isStmtExpr=*/false); 7882 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7883 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7884 7885 if (ASTMutationListener *L = getASTMutationListener()) { 7886 L->CompletedImplicitDefinition(CopyAssignOperator); 7887 } 7888} 7889 7890Sema::ImplicitExceptionSpecification 7891Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7892 ImplicitExceptionSpecification ExceptSpec(Context); 7893 7894 if (ClassDecl->isInvalidDecl()) 7895 return ExceptSpec; 7896 7897 // C++0x [except.spec]p14: 7898 // An implicitly declared special member function (Clause 12) shall have an 7899 // exception-specification. [...] 7900 7901 // It is unspecified whether or not an implicit move assignment operator 7902 // attempts to deduplicate calls to assignment operators of virtual bases are 7903 // made. As such, this exception specification is effectively unspecified. 7904 // Based on a similar decision made for constness in C++0x, we're erring on 7905 // the side of assuming such calls to be made regardless of whether they 7906 // actually happen. 7907 // Note that a move constructor is not implicitly declared when there are 7908 // virtual bases, but it can still be user-declared and explicitly defaulted. 7909 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7910 BaseEnd = ClassDecl->bases_end(); 7911 Base != BaseEnd; ++Base) { 7912 if (Base->isVirtual()) 7913 continue; 7914 7915 CXXRecordDecl *BaseClassDecl 7916 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7917 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7918 false, 0)) 7919 ExceptSpec.CalledDecl(MoveAssign); 7920 } 7921 7922 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7923 BaseEnd = ClassDecl->vbases_end(); 7924 Base != BaseEnd; ++Base) { 7925 CXXRecordDecl *BaseClassDecl 7926 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7927 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7928 false, 0)) 7929 ExceptSpec.CalledDecl(MoveAssign); 7930 } 7931 7932 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7933 FieldEnd = ClassDecl->field_end(); 7934 Field != FieldEnd; 7935 ++Field) { 7936 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7937 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7938 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7939 false, 0)) 7940 ExceptSpec.CalledDecl(MoveAssign); 7941 } 7942 } 7943 7944 return ExceptSpec; 7945} 7946 7947CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7948 // Note: The following rules are largely analoguous to the move 7949 // constructor rules. 7950 7951 ImplicitExceptionSpecification Spec( 7952 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7953 7954 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7955 QualType RetType = Context.getLValueReferenceType(ArgType); 7956 ArgType = Context.getRValueReferenceType(ArgType); 7957 7958 // An implicitly-declared move assignment operator is an inline public 7959 // member of its class. 7960 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7961 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7962 SourceLocation ClassLoc = ClassDecl->getLocation(); 7963 DeclarationNameInfo NameInfo(Name, ClassLoc); 7964 CXXMethodDecl *MoveAssignment 7965 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7966 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7967 /*TInfo=*/0, /*isStatic=*/false, 7968 /*StorageClassAsWritten=*/SC_None, 7969 /*isInline=*/true, 7970 /*isConstexpr=*/false, 7971 SourceLocation()); 7972 MoveAssignment->setAccess(AS_public); 7973 MoveAssignment->setDefaulted(); 7974 MoveAssignment->setImplicit(); 7975 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7976 7977 // Add the parameter to the operator. 7978 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7979 ClassLoc, ClassLoc, /*Id=*/0, 7980 ArgType, /*TInfo=*/0, 7981 SC_None, 7982 SC_None, 0); 7983 MoveAssignment->setParams(FromParam); 7984 7985 // Note that we have added this copy-assignment operator. 7986 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7987 7988 // C++0x [class.copy]p9: 7989 // If the definition of a class X does not explicitly declare a move 7990 // assignment operator, one will be implicitly declared as defaulted if and 7991 // only if: 7992 // [...] 7993 // - the move assignment operator would not be implicitly defined as 7994 // deleted. 7995 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7996 // Cache this result so that we don't try to generate this over and over 7997 // on every lookup, leaking memory and wasting time. 7998 ClassDecl->setFailedImplicitMoveAssignment(); 7999 return 0; 8000 } 8001 8002 if (Scope *S = getScopeForContext(ClassDecl)) 8003 PushOnScopeChains(MoveAssignment, S, false); 8004 ClassDecl->addDecl(MoveAssignment); 8005 8006 AddOverriddenMethods(ClassDecl, MoveAssignment); 8007 return MoveAssignment; 8008} 8009 8010void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8011 CXXMethodDecl *MoveAssignOperator) { 8012 assert((MoveAssignOperator->isDefaulted() && 8013 MoveAssignOperator->isOverloadedOperator() && 8014 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8015 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8016 "DefineImplicitMoveAssignment called for wrong function"); 8017 8018 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8019 8020 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8021 MoveAssignOperator->setInvalidDecl(); 8022 return; 8023 } 8024 8025 MoveAssignOperator->setUsed(); 8026 8027 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8028 DiagnosticErrorTrap Trap(Diags); 8029 8030 // C++0x [class.copy]p28: 8031 // The implicitly-defined or move assignment operator for a non-union class 8032 // X performs memberwise move assignment of its subobjects. The direct base 8033 // classes of X are assigned first, in the order of their declaration in the 8034 // base-specifier-list, and then the immediate non-static data members of X 8035 // are assigned, in the order in which they were declared in the class 8036 // definition. 8037 8038 // The statements that form the synthesized function body. 8039 ASTOwningVector<Stmt*> Statements(*this); 8040 8041 // The parameter for the "other" object, which we are move from. 8042 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8043 QualType OtherRefType = Other->getType()-> 8044 getAs<RValueReferenceType>()->getPointeeType(); 8045 assert(OtherRefType.getQualifiers() == 0 && 8046 "Bad argument type of defaulted move assignment"); 8047 8048 // Our location for everything implicitly-generated. 8049 SourceLocation Loc = MoveAssignOperator->getLocation(); 8050 8051 // Construct a reference to the "other" object. We'll be using this 8052 // throughout the generated ASTs. 8053 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8054 assert(OtherRef && "Reference to parameter cannot fail!"); 8055 // Cast to rvalue. 8056 OtherRef = CastForMoving(*this, OtherRef); 8057 8058 // Construct the "this" pointer. We'll be using this throughout the generated 8059 // ASTs. 8060 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8061 assert(This && "Reference to this cannot fail!"); 8062 8063 // Assign base classes. 8064 bool Invalid = false; 8065 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8066 E = ClassDecl->bases_end(); Base != E; ++Base) { 8067 // Form the assignment: 8068 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8069 QualType BaseType = Base->getType().getUnqualifiedType(); 8070 if (!BaseType->isRecordType()) { 8071 Invalid = true; 8072 continue; 8073 } 8074 8075 CXXCastPath BasePath; 8076 BasePath.push_back(Base); 8077 8078 // Construct the "from" expression, which is an implicit cast to the 8079 // appropriately-qualified base type. 8080 Expr *From = OtherRef; 8081 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8082 VK_XValue, &BasePath).take(); 8083 8084 // Dereference "this". 8085 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8086 8087 // Implicitly cast "this" to the appropriately-qualified base type. 8088 To = ImpCastExprToType(To.take(), 8089 Context.getCVRQualifiedType(BaseType, 8090 MoveAssignOperator->getTypeQualifiers()), 8091 CK_UncheckedDerivedToBase, 8092 VK_LValue, &BasePath); 8093 8094 // Build the move. 8095 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8096 To.get(), From, 8097 /*CopyingBaseSubobject=*/true, 8098 /*Copying=*/false); 8099 if (Move.isInvalid()) { 8100 Diag(CurrentLocation, diag::note_member_synthesized_at) 8101 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8102 MoveAssignOperator->setInvalidDecl(); 8103 return; 8104 } 8105 8106 // Success! Record the move. 8107 Statements.push_back(Move.takeAs<Expr>()); 8108 } 8109 8110 // \brief Reference to the __builtin_memcpy function. 8111 Expr *BuiltinMemCpyRef = 0; 8112 // \brief Reference to the __builtin_objc_memmove_collectable function. 8113 Expr *CollectableMemCpyRef = 0; 8114 8115 // Assign non-static members. 8116 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8117 FieldEnd = ClassDecl->field_end(); 8118 Field != FieldEnd; ++Field) { 8119 if (Field->isUnnamedBitfield()) 8120 continue; 8121 8122 // Check for members of reference type; we can't move those. 8123 if (Field->getType()->isReferenceType()) { 8124 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8125 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8126 Diag(Field->getLocation(), diag::note_declared_at); 8127 Diag(CurrentLocation, diag::note_member_synthesized_at) 8128 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8129 Invalid = true; 8130 continue; 8131 } 8132 8133 // Check for members of const-qualified, non-class type. 8134 QualType BaseType = Context.getBaseElementType(Field->getType()); 8135 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8136 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8137 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8138 Diag(Field->getLocation(), diag::note_declared_at); 8139 Diag(CurrentLocation, diag::note_member_synthesized_at) 8140 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8141 Invalid = true; 8142 continue; 8143 } 8144 8145 // Suppress assigning zero-width bitfields. 8146 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8147 continue; 8148 8149 QualType FieldType = Field->getType().getNonReferenceType(); 8150 if (FieldType->isIncompleteArrayType()) { 8151 assert(ClassDecl->hasFlexibleArrayMember() && 8152 "Incomplete array type is not valid"); 8153 continue; 8154 } 8155 8156 // Build references to the field in the object we're copying from and to. 8157 CXXScopeSpec SS; // Intentionally empty 8158 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8159 LookupMemberName); 8160 MemberLookup.addDecl(*Field); 8161 MemberLookup.resolveKind(); 8162 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8163 Loc, /*IsArrow=*/false, 8164 SS, 0, MemberLookup, 0); 8165 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8166 Loc, /*IsArrow=*/true, 8167 SS, 0, MemberLookup, 0); 8168 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8169 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8170 8171 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8172 "Member reference with rvalue base must be rvalue except for reference " 8173 "members, which aren't allowed for move assignment."); 8174 8175 // If the field should be copied with __builtin_memcpy rather than via 8176 // explicit assignments, do so. This optimization only applies for arrays 8177 // of scalars and arrays of class type with trivial move-assignment 8178 // operators. 8179 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8180 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8181 // Compute the size of the memory buffer to be copied. 8182 QualType SizeType = Context.getSizeType(); 8183 llvm::APInt Size(Context.getTypeSize(SizeType), 8184 Context.getTypeSizeInChars(BaseType).getQuantity()); 8185 for (const ConstantArrayType *Array 8186 = Context.getAsConstantArrayType(FieldType); 8187 Array; 8188 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8189 llvm::APInt ArraySize 8190 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8191 Size *= ArraySize; 8192 } 8193 8194 // Take the address of the field references for "from" and "to". We 8195 // directly construct UnaryOperators here because semantic analysis 8196 // does not permit us to take the address of an xvalue. 8197 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8198 Context.getPointerType(From.get()->getType()), 8199 VK_RValue, OK_Ordinary, Loc); 8200 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8201 Context.getPointerType(To.get()->getType()), 8202 VK_RValue, OK_Ordinary, Loc); 8203 8204 bool NeedsCollectableMemCpy = 8205 (BaseType->isRecordType() && 8206 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8207 8208 if (NeedsCollectableMemCpy) { 8209 if (!CollectableMemCpyRef) { 8210 // Create a reference to the __builtin_objc_memmove_collectable function. 8211 LookupResult R(*this, 8212 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8213 Loc, LookupOrdinaryName); 8214 LookupName(R, TUScope, true); 8215 8216 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8217 if (!CollectableMemCpy) { 8218 // Something went horribly wrong earlier, and we will have 8219 // complained about it. 8220 Invalid = true; 8221 continue; 8222 } 8223 8224 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8225 CollectableMemCpy->getType(), 8226 VK_LValue, Loc, 0).take(); 8227 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8228 } 8229 } 8230 // Create a reference to the __builtin_memcpy builtin function. 8231 else if (!BuiltinMemCpyRef) { 8232 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8233 LookupOrdinaryName); 8234 LookupName(R, TUScope, true); 8235 8236 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8237 if (!BuiltinMemCpy) { 8238 // Something went horribly wrong earlier, and we will have complained 8239 // about it. 8240 Invalid = true; 8241 continue; 8242 } 8243 8244 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8245 BuiltinMemCpy->getType(), 8246 VK_LValue, Loc, 0).take(); 8247 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8248 } 8249 8250 ASTOwningVector<Expr*> CallArgs(*this); 8251 CallArgs.push_back(To.takeAs<Expr>()); 8252 CallArgs.push_back(From.takeAs<Expr>()); 8253 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8254 ExprResult Call = ExprError(); 8255 if (NeedsCollectableMemCpy) 8256 Call = ActOnCallExpr(/*Scope=*/0, 8257 CollectableMemCpyRef, 8258 Loc, move_arg(CallArgs), 8259 Loc); 8260 else 8261 Call = ActOnCallExpr(/*Scope=*/0, 8262 BuiltinMemCpyRef, 8263 Loc, move_arg(CallArgs), 8264 Loc); 8265 8266 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8267 Statements.push_back(Call.takeAs<Expr>()); 8268 continue; 8269 } 8270 8271 // Build the move of this field. 8272 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8273 To.get(), From.get(), 8274 /*CopyingBaseSubobject=*/false, 8275 /*Copying=*/false); 8276 if (Move.isInvalid()) { 8277 Diag(CurrentLocation, diag::note_member_synthesized_at) 8278 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8279 MoveAssignOperator->setInvalidDecl(); 8280 return; 8281 } 8282 8283 // Success! Record the copy. 8284 Statements.push_back(Move.takeAs<Stmt>()); 8285 } 8286 8287 if (!Invalid) { 8288 // Add a "return *this;" 8289 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8290 8291 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8292 if (Return.isInvalid()) 8293 Invalid = true; 8294 else { 8295 Statements.push_back(Return.takeAs<Stmt>()); 8296 8297 if (Trap.hasErrorOccurred()) { 8298 Diag(CurrentLocation, diag::note_member_synthesized_at) 8299 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8300 Invalid = true; 8301 } 8302 } 8303 } 8304 8305 if (Invalid) { 8306 MoveAssignOperator->setInvalidDecl(); 8307 return; 8308 } 8309 8310 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8311 /*isStmtExpr=*/false); 8312 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8313 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8314 8315 if (ASTMutationListener *L = getASTMutationListener()) { 8316 L->CompletedImplicitDefinition(MoveAssignOperator); 8317 } 8318} 8319 8320std::pair<Sema::ImplicitExceptionSpecification, bool> 8321Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8322 if (ClassDecl->isInvalidDecl()) 8323 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8324 8325 // C++ [class.copy]p5: 8326 // The implicitly-declared copy constructor for a class X will 8327 // have the form 8328 // 8329 // X::X(const X&) 8330 // 8331 // if 8332 // FIXME: It ought to be possible to store this on the record. 8333 bool HasConstCopyConstructor = true; 8334 8335 // -- each direct or virtual base class B of X has a copy 8336 // constructor whose first parameter is of type const B& or 8337 // const volatile B&, and 8338 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8339 BaseEnd = ClassDecl->bases_end(); 8340 HasConstCopyConstructor && Base != BaseEnd; 8341 ++Base) { 8342 // Virtual bases are handled below. 8343 if (Base->isVirtual()) 8344 continue; 8345 8346 CXXRecordDecl *BaseClassDecl 8347 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8348 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8349 &HasConstCopyConstructor); 8350 } 8351 8352 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8353 BaseEnd = ClassDecl->vbases_end(); 8354 HasConstCopyConstructor && Base != BaseEnd; 8355 ++Base) { 8356 CXXRecordDecl *BaseClassDecl 8357 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8358 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8359 &HasConstCopyConstructor); 8360 } 8361 8362 // -- for all the nonstatic data members of X that are of a 8363 // class type M (or array thereof), each such class type 8364 // has a copy constructor whose first parameter is of type 8365 // const M& or const volatile M&. 8366 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8367 FieldEnd = ClassDecl->field_end(); 8368 HasConstCopyConstructor && Field != FieldEnd; 8369 ++Field) { 8370 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8371 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8372 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8373 &HasConstCopyConstructor); 8374 } 8375 } 8376 // Otherwise, the implicitly declared copy constructor will have 8377 // the form 8378 // 8379 // X::X(X&) 8380 8381 // C++ [except.spec]p14: 8382 // An implicitly declared special member function (Clause 12) shall have an 8383 // exception-specification. [...] 8384 ImplicitExceptionSpecification ExceptSpec(Context); 8385 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8386 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8387 BaseEnd = ClassDecl->bases_end(); 8388 Base != BaseEnd; 8389 ++Base) { 8390 // Virtual bases are handled below. 8391 if (Base->isVirtual()) 8392 continue; 8393 8394 CXXRecordDecl *BaseClassDecl 8395 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8396 if (CXXConstructorDecl *CopyConstructor = 8397 LookupCopyingConstructor(BaseClassDecl, Quals)) 8398 ExceptSpec.CalledDecl(CopyConstructor); 8399 } 8400 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8401 BaseEnd = ClassDecl->vbases_end(); 8402 Base != BaseEnd; 8403 ++Base) { 8404 CXXRecordDecl *BaseClassDecl 8405 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8406 if (CXXConstructorDecl *CopyConstructor = 8407 LookupCopyingConstructor(BaseClassDecl, Quals)) 8408 ExceptSpec.CalledDecl(CopyConstructor); 8409 } 8410 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8411 FieldEnd = ClassDecl->field_end(); 8412 Field != FieldEnd; 8413 ++Field) { 8414 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8415 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8416 if (CXXConstructorDecl *CopyConstructor = 8417 LookupCopyingConstructor(FieldClassDecl, Quals)) 8418 ExceptSpec.CalledDecl(CopyConstructor); 8419 } 8420 } 8421 8422 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8423} 8424 8425CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8426 CXXRecordDecl *ClassDecl) { 8427 // C++ [class.copy]p4: 8428 // If the class definition does not explicitly declare a copy 8429 // constructor, one is declared implicitly. 8430 8431 ImplicitExceptionSpecification Spec(Context); 8432 bool Const; 8433 llvm::tie(Spec, Const) = 8434 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8435 8436 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8437 QualType ArgType = ClassType; 8438 if (Const) 8439 ArgType = ArgType.withConst(); 8440 ArgType = Context.getLValueReferenceType(ArgType); 8441 8442 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8443 8444 DeclarationName Name 8445 = Context.DeclarationNames.getCXXConstructorName( 8446 Context.getCanonicalType(ClassType)); 8447 SourceLocation ClassLoc = ClassDecl->getLocation(); 8448 DeclarationNameInfo NameInfo(Name, ClassLoc); 8449 8450 // An implicitly-declared copy constructor is an inline public 8451 // member of its class. 8452 CXXConstructorDecl *CopyConstructor 8453 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8454 Context.getFunctionType(Context.VoidTy, 8455 &ArgType, 1, EPI), 8456 /*TInfo=*/0, 8457 /*isExplicit=*/false, 8458 /*isInline=*/true, 8459 /*isImplicitlyDeclared=*/true, 8460 // FIXME: apply the rules for definitions here 8461 /*isConstexpr=*/false); 8462 CopyConstructor->setAccess(AS_public); 8463 CopyConstructor->setDefaulted(); 8464 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8465 8466 // Note that we have declared this constructor. 8467 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8468 8469 // Add the parameter to the constructor. 8470 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8471 ClassLoc, ClassLoc, 8472 /*IdentifierInfo=*/0, 8473 ArgType, /*TInfo=*/0, 8474 SC_None, 8475 SC_None, 0); 8476 CopyConstructor->setParams(FromParam); 8477 8478 if (Scope *S = getScopeForContext(ClassDecl)) 8479 PushOnScopeChains(CopyConstructor, S, false); 8480 ClassDecl->addDecl(CopyConstructor); 8481 8482 // C++0x [class.copy]p7: 8483 // ... If the class definition declares a move constructor or move 8484 // assignment operator, the implicitly declared constructor is defined as 8485 // deleted; ... 8486 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8487 ClassDecl->hasUserDeclaredMoveAssignment() || 8488 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8489 CopyConstructor->setDeletedAsWritten(); 8490 8491 return CopyConstructor; 8492} 8493 8494void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8495 CXXConstructorDecl *CopyConstructor) { 8496 assert((CopyConstructor->isDefaulted() && 8497 CopyConstructor->isCopyConstructor() && 8498 !CopyConstructor->doesThisDeclarationHaveABody()) && 8499 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8500 8501 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8502 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8503 8504 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8505 DiagnosticErrorTrap Trap(Diags); 8506 8507 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8508 Trap.hasErrorOccurred()) { 8509 Diag(CurrentLocation, diag::note_member_synthesized_at) 8510 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8511 CopyConstructor->setInvalidDecl(); 8512 } else { 8513 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8514 CopyConstructor->getLocation(), 8515 MultiStmtArg(*this, 0, 0), 8516 /*isStmtExpr=*/false) 8517 .takeAs<Stmt>()); 8518 CopyConstructor->setImplicitlyDefined(true); 8519 } 8520 8521 CopyConstructor->setUsed(); 8522 if (ASTMutationListener *L = getASTMutationListener()) { 8523 L->CompletedImplicitDefinition(CopyConstructor); 8524 } 8525} 8526 8527Sema::ImplicitExceptionSpecification 8528Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8529 // C++ [except.spec]p14: 8530 // An implicitly declared special member function (Clause 12) shall have an 8531 // exception-specification. [...] 8532 ImplicitExceptionSpecification ExceptSpec(Context); 8533 if (ClassDecl->isInvalidDecl()) 8534 return ExceptSpec; 8535 8536 // Direct base-class constructors. 8537 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8538 BEnd = ClassDecl->bases_end(); 8539 B != BEnd; ++B) { 8540 if (B->isVirtual()) // Handled below. 8541 continue; 8542 8543 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8544 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8545 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8546 // If this is a deleted function, add it anyway. This might be conformant 8547 // with the standard. This might not. I'm not sure. It might not matter. 8548 if (Constructor) 8549 ExceptSpec.CalledDecl(Constructor); 8550 } 8551 } 8552 8553 // Virtual base-class constructors. 8554 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8555 BEnd = ClassDecl->vbases_end(); 8556 B != BEnd; ++B) { 8557 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8558 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8559 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8560 // If this is a deleted function, add it anyway. This might be conformant 8561 // with the standard. This might not. I'm not sure. It might not matter. 8562 if (Constructor) 8563 ExceptSpec.CalledDecl(Constructor); 8564 } 8565 } 8566 8567 // Field constructors. 8568 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8569 FEnd = ClassDecl->field_end(); 8570 F != FEnd; ++F) { 8571 if (F->hasInClassInitializer()) { 8572 if (Expr *E = F->getInClassInitializer()) 8573 ExceptSpec.CalledExpr(E); 8574 else if (!F->isInvalidDecl()) 8575 ExceptSpec.SetDelayed(); 8576 } else if (const RecordType *RecordTy 8577 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8578 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8579 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8580 // If this is a deleted function, add it anyway. This might be conformant 8581 // with the standard. This might not. I'm not sure. It might not matter. 8582 // In particular, the problem is that this function never gets called. It 8583 // might just be ill-formed because this function attempts to refer to 8584 // a deleted function here. 8585 if (Constructor) 8586 ExceptSpec.CalledDecl(Constructor); 8587 } 8588 } 8589 8590 return ExceptSpec; 8591} 8592 8593CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8594 CXXRecordDecl *ClassDecl) { 8595 ImplicitExceptionSpecification Spec( 8596 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8597 8598 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8599 QualType ArgType = Context.getRValueReferenceType(ClassType); 8600 8601 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8602 8603 DeclarationName Name 8604 = Context.DeclarationNames.getCXXConstructorName( 8605 Context.getCanonicalType(ClassType)); 8606 SourceLocation ClassLoc = ClassDecl->getLocation(); 8607 DeclarationNameInfo NameInfo(Name, ClassLoc); 8608 8609 // C++0x [class.copy]p11: 8610 // An implicitly-declared copy/move constructor is an inline public 8611 // member of its class. 8612 CXXConstructorDecl *MoveConstructor 8613 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8614 Context.getFunctionType(Context.VoidTy, 8615 &ArgType, 1, EPI), 8616 /*TInfo=*/0, 8617 /*isExplicit=*/false, 8618 /*isInline=*/true, 8619 /*isImplicitlyDeclared=*/true, 8620 // FIXME: apply the rules for definitions here 8621 /*isConstexpr=*/false); 8622 MoveConstructor->setAccess(AS_public); 8623 MoveConstructor->setDefaulted(); 8624 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8625 8626 // Add the parameter to the constructor. 8627 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8628 ClassLoc, ClassLoc, 8629 /*IdentifierInfo=*/0, 8630 ArgType, /*TInfo=*/0, 8631 SC_None, 8632 SC_None, 0); 8633 MoveConstructor->setParams(FromParam); 8634 8635 // C++0x [class.copy]p9: 8636 // If the definition of a class X does not explicitly declare a move 8637 // constructor, one will be implicitly declared as defaulted if and only if: 8638 // [...] 8639 // - the move constructor would not be implicitly defined as deleted. 8640 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8641 // Cache this result so that we don't try to generate this over and over 8642 // on every lookup, leaking memory and wasting time. 8643 ClassDecl->setFailedImplicitMoveConstructor(); 8644 return 0; 8645 } 8646 8647 // Note that we have declared this constructor. 8648 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8649 8650 if (Scope *S = getScopeForContext(ClassDecl)) 8651 PushOnScopeChains(MoveConstructor, S, false); 8652 ClassDecl->addDecl(MoveConstructor); 8653 8654 return MoveConstructor; 8655} 8656 8657void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8658 CXXConstructorDecl *MoveConstructor) { 8659 assert((MoveConstructor->isDefaulted() && 8660 MoveConstructor->isMoveConstructor() && 8661 !MoveConstructor->doesThisDeclarationHaveABody()) && 8662 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8663 8664 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8665 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8666 8667 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8668 DiagnosticErrorTrap Trap(Diags); 8669 8670 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8671 Trap.hasErrorOccurred()) { 8672 Diag(CurrentLocation, diag::note_member_synthesized_at) 8673 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8674 MoveConstructor->setInvalidDecl(); 8675 } else { 8676 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8677 MoveConstructor->getLocation(), 8678 MultiStmtArg(*this, 0, 0), 8679 /*isStmtExpr=*/false) 8680 .takeAs<Stmt>()); 8681 MoveConstructor->setImplicitlyDefined(true); 8682 } 8683 8684 MoveConstructor->setUsed(); 8685 8686 if (ASTMutationListener *L = getASTMutationListener()) { 8687 L->CompletedImplicitDefinition(MoveConstructor); 8688 } 8689} 8690 8691ExprResult 8692Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8693 CXXConstructorDecl *Constructor, 8694 MultiExprArg ExprArgs, 8695 bool HadMultipleCandidates, 8696 bool RequiresZeroInit, 8697 unsigned ConstructKind, 8698 SourceRange ParenRange) { 8699 bool Elidable = false; 8700 8701 // C++0x [class.copy]p34: 8702 // When certain criteria are met, an implementation is allowed to 8703 // omit the copy/move construction of a class object, even if the 8704 // copy/move constructor and/or destructor for the object have 8705 // side effects. [...] 8706 // - when a temporary class object that has not been bound to a 8707 // reference (12.2) would be copied/moved to a class object 8708 // with the same cv-unqualified type, the copy/move operation 8709 // can be omitted by constructing the temporary object 8710 // directly into the target of the omitted copy/move 8711 if (ConstructKind == CXXConstructExpr::CK_Complete && 8712 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8713 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8714 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8715 } 8716 8717 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8718 Elidable, move(ExprArgs), HadMultipleCandidates, 8719 RequiresZeroInit, ConstructKind, ParenRange); 8720} 8721 8722/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8723/// including handling of its default argument expressions. 8724ExprResult 8725Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8726 CXXConstructorDecl *Constructor, bool Elidable, 8727 MultiExprArg ExprArgs, 8728 bool HadMultipleCandidates, 8729 bool RequiresZeroInit, 8730 unsigned ConstructKind, 8731 SourceRange ParenRange) { 8732 unsigned NumExprs = ExprArgs.size(); 8733 Expr **Exprs = (Expr **)ExprArgs.release(); 8734 8735 for (specific_attr_iterator<NonNullAttr> 8736 i = Constructor->specific_attr_begin<NonNullAttr>(), 8737 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8738 const NonNullAttr *NonNull = *i; 8739 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8740 } 8741 8742 MarkDeclarationReferenced(ConstructLoc, Constructor); 8743 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8744 Constructor, Elidable, Exprs, NumExprs, 8745 HadMultipleCandidates, RequiresZeroInit, 8746 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8747 ParenRange)); 8748} 8749 8750bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8751 CXXConstructorDecl *Constructor, 8752 MultiExprArg Exprs, 8753 bool HadMultipleCandidates) { 8754 // FIXME: Provide the correct paren SourceRange when available. 8755 ExprResult TempResult = 8756 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8757 move(Exprs), HadMultipleCandidates, false, 8758 CXXConstructExpr::CK_Complete, SourceRange()); 8759 if (TempResult.isInvalid()) 8760 return true; 8761 8762 Expr *Temp = TempResult.takeAs<Expr>(); 8763 CheckImplicitConversions(Temp, VD->getLocation()); 8764 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8765 Temp = MaybeCreateExprWithCleanups(Temp); 8766 VD->setInit(Temp); 8767 8768 return false; 8769} 8770 8771void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8772 if (VD->isInvalidDecl()) return; 8773 8774 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8775 if (ClassDecl->isInvalidDecl()) return; 8776 if (ClassDecl->hasTrivialDestructor()) return; 8777 if (ClassDecl->isDependentContext()) return; 8778 8779 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8780 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8781 CheckDestructorAccess(VD->getLocation(), Destructor, 8782 PDiag(diag::err_access_dtor_var) 8783 << VD->getDeclName() 8784 << VD->getType()); 8785 8786 if (!VD->hasGlobalStorage()) return; 8787 8788 // Emit warning for non-trivial dtor in global scope (a real global, 8789 // class-static, function-static). 8790 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8791 8792 // TODO: this should be re-enabled for static locals by !CXAAtExit 8793 if (!VD->isStaticLocal()) 8794 Diag(VD->getLocation(), diag::warn_global_destructor); 8795} 8796 8797/// AddCXXDirectInitializerToDecl - This action is called immediately after 8798/// ActOnDeclarator, when a C++ direct initializer is present. 8799/// e.g: "int x(1);" 8800void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8801 SourceLocation LParenLoc, 8802 MultiExprArg Exprs, 8803 SourceLocation RParenLoc, 8804 bool TypeMayContainAuto) { 8805 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8806 8807 // If there is no declaration, there was an error parsing it. Just ignore 8808 // the initializer. 8809 if (RealDecl == 0) 8810 return; 8811 8812 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8813 if (!VDecl) { 8814 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8815 RealDecl->setInvalidDecl(); 8816 return; 8817 } 8818 8819 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8820 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8821 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8822 if (Exprs.size() > 1) { 8823 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8824 diag::err_auto_var_init_multiple_expressions) 8825 << VDecl->getDeclName() << VDecl->getType() 8826 << VDecl->getSourceRange(); 8827 RealDecl->setInvalidDecl(); 8828 return; 8829 } 8830 8831 Expr *Init = Exprs.get()[0]; 8832 TypeSourceInfo *DeducedType = 0; 8833 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8834 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8835 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8836 << Init->getSourceRange(); 8837 if (!DeducedType) { 8838 RealDecl->setInvalidDecl(); 8839 return; 8840 } 8841 VDecl->setTypeSourceInfo(DeducedType); 8842 VDecl->setType(DeducedType->getType()); 8843 8844 // In ARC, infer lifetime. 8845 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8846 VDecl->setInvalidDecl(); 8847 8848 // If this is a redeclaration, check that the type we just deduced matches 8849 // the previously declared type. 8850 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8851 MergeVarDeclTypes(VDecl, Old); 8852 } 8853 8854 // We will represent direct-initialization similarly to copy-initialization: 8855 // int x(1); -as-> int x = 1; 8856 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8857 // 8858 // Clients that want to distinguish between the two forms, can check for 8859 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8860 // A major benefit is that clients that don't particularly care about which 8861 // exactly form was it (like the CodeGen) can handle both cases without 8862 // special case code. 8863 8864 // C++ 8.5p11: 8865 // The form of initialization (using parentheses or '=') is generally 8866 // insignificant, but does matter when the entity being initialized has a 8867 // class type. 8868 8869 if (!VDecl->getType()->isDependentType() && 8870 !VDecl->getType()->isIncompleteArrayType() && 8871 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8872 diag::err_typecheck_decl_incomplete_type)) { 8873 VDecl->setInvalidDecl(); 8874 return; 8875 } 8876 8877 // The variable can not have an abstract class type. 8878 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8879 diag::err_abstract_type_in_decl, 8880 AbstractVariableType)) 8881 VDecl->setInvalidDecl(); 8882 8883 const VarDecl *Def; 8884 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8885 Diag(VDecl->getLocation(), diag::err_redefinition) 8886 << VDecl->getDeclName(); 8887 Diag(Def->getLocation(), diag::note_previous_definition); 8888 VDecl->setInvalidDecl(); 8889 return; 8890 } 8891 8892 // C++ [class.static.data]p4 8893 // If a static data member is of const integral or const 8894 // enumeration type, its declaration in the class definition can 8895 // specify a constant-initializer which shall be an integral 8896 // constant expression (5.19). In that case, the member can appear 8897 // in integral constant expressions. The member shall still be 8898 // defined in a namespace scope if it is used in the program and the 8899 // namespace scope definition shall not contain an initializer. 8900 // 8901 // We already performed a redefinition check above, but for static 8902 // data members we also need to check whether there was an in-class 8903 // declaration with an initializer. 8904 const VarDecl* PrevInit = 0; 8905 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8906 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8907 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8908 return; 8909 } 8910 8911 bool IsDependent = false; 8912 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8913 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8914 VDecl->setInvalidDecl(); 8915 return; 8916 } 8917 8918 if (Exprs.get()[I]->isTypeDependent()) 8919 IsDependent = true; 8920 } 8921 8922 // If either the declaration has a dependent type or if any of the 8923 // expressions is type-dependent, we represent the initialization 8924 // via a ParenListExpr for later use during template instantiation. 8925 if (VDecl->getType()->isDependentType() || IsDependent) { 8926 // Let clients know that initialization was done with a direct initializer. 8927 VDecl->setCXXDirectInitializer(true); 8928 8929 // Store the initialization expressions as a ParenListExpr. 8930 unsigned NumExprs = Exprs.size(); 8931 VDecl->setInit(new (Context) ParenListExpr( 8932 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8933 VDecl->getType().getNonReferenceType())); 8934 return; 8935 } 8936 8937 // Capture the variable that is being initialized and the style of 8938 // initialization. 8939 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8940 8941 // FIXME: Poor source location information. 8942 InitializationKind Kind 8943 = InitializationKind::CreateDirect(VDecl->getLocation(), 8944 LParenLoc, RParenLoc); 8945 8946 QualType T = VDecl->getType(); 8947 InitializationSequence InitSeq(*this, Entity, Kind, 8948 Exprs.get(), Exprs.size()); 8949 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8950 if (Result.isInvalid()) { 8951 VDecl->setInvalidDecl(); 8952 return; 8953 } else if (T != VDecl->getType()) { 8954 VDecl->setType(T); 8955 Result.get()->setType(T); 8956 } 8957 8958 8959 Expr *Init = Result.get(); 8960 CheckImplicitConversions(Init, LParenLoc); 8961 8962 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 8963 !Init->isValueDependent() && 8964 !Init->isConstantInitializer(Context, 8965 VDecl->getType()->isReferenceType())) { 8966 // FIXME: Improve this diagnostic to explain why the initializer is not 8967 // a constant expression. 8968 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 8969 << VDecl << Init->getSourceRange(); 8970 } 8971 8972 Init = MaybeCreateExprWithCleanups(Init); 8973 VDecl->setInit(Init); 8974 VDecl->setCXXDirectInitializer(true); 8975 8976 CheckCompleteVariableDeclaration(VDecl); 8977} 8978 8979/// \brief Given a constructor and the set of arguments provided for the 8980/// constructor, convert the arguments and add any required default arguments 8981/// to form a proper call to this constructor. 8982/// 8983/// \returns true if an error occurred, false otherwise. 8984bool 8985Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8986 MultiExprArg ArgsPtr, 8987 SourceLocation Loc, 8988 ASTOwningVector<Expr*> &ConvertedArgs) { 8989 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8990 unsigned NumArgs = ArgsPtr.size(); 8991 Expr **Args = (Expr **)ArgsPtr.get(); 8992 8993 const FunctionProtoType *Proto 8994 = Constructor->getType()->getAs<FunctionProtoType>(); 8995 assert(Proto && "Constructor without a prototype?"); 8996 unsigned NumArgsInProto = Proto->getNumArgs(); 8997 8998 // If too few arguments are available, we'll fill in the rest with defaults. 8999 if (NumArgs < NumArgsInProto) 9000 ConvertedArgs.reserve(NumArgsInProto); 9001 else 9002 ConvertedArgs.reserve(NumArgs); 9003 9004 VariadicCallType CallType = 9005 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9006 SmallVector<Expr *, 8> AllArgs; 9007 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9008 Proto, 0, Args, NumArgs, AllArgs, 9009 CallType); 9010 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9011 ConvertedArgs.push_back(AllArgs[i]); 9012 return Invalid; 9013} 9014 9015static inline bool 9016CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9017 const FunctionDecl *FnDecl) { 9018 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9019 if (isa<NamespaceDecl>(DC)) { 9020 return SemaRef.Diag(FnDecl->getLocation(), 9021 diag::err_operator_new_delete_declared_in_namespace) 9022 << FnDecl->getDeclName(); 9023 } 9024 9025 if (isa<TranslationUnitDecl>(DC) && 9026 FnDecl->getStorageClass() == SC_Static) { 9027 return SemaRef.Diag(FnDecl->getLocation(), 9028 diag::err_operator_new_delete_declared_static) 9029 << FnDecl->getDeclName(); 9030 } 9031 9032 return false; 9033} 9034 9035static inline bool 9036CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9037 CanQualType ExpectedResultType, 9038 CanQualType ExpectedFirstParamType, 9039 unsigned DependentParamTypeDiag, 9040 unsigned InvalidParamTypeDiag) { 9041 QualType ResultType = 9042 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9043 9044 // Check that the result type is not dependent. 9045 if (ResultType->isDependentType()) 9046 return SemaRef.Diag(FnDecl->getLocation(), 9047 diag::err_operator_new_delete_dependent_result_type) 9048 << FnDecl->getDeclName() << ExpectedResultType; 9049 9050 // Check that the result type is what we expect. 9051 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9052 return SemaRef.Diag(FnDecl->getLocation(), 9053 diag::err_operator_new_delete_invalid_result_type) 9054 << FnDecl->getDeclName() << ExpectedResultType; 9055 9056 // A function template must have at least 2 parameters. 9057 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9058 return SemaRef.Diag(FnDecl->getLocation(), 9059 diag::err_operator_new_delete_template_too_few_parameters) 9060 << FnDecl->getDeclName(); 9061 9062 // The function decl must have at least 1 parameter. 9063 if (FnDecl->getNumParams() == 0) 9064 return SemaRef.Diag(FnDecl->getLocation(), 9065 diag::err_operator_new_delete_too_few_parameters) 9066 << FnDecl->getDeclName(); 9067 9068 // Check the the first parameter type is not dependent. 9069 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9070 if (FirstParamType->isDependentType()) 9071 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9072 << FnDecl->getDeclName() << ExpectedFirstParamType; 9073 9074 // Check that the first parameter type is what we expect. 9075 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9076 ExpectedFirstParamType) 9077 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9078 << FnDecl->getDeclName() << ExpectedFirstParamType; 9079 9080 return false; 9081} 9082 9083static bool 9084CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9085 // C++ [basic.stc.dynamic.allocation]p1: 9086 // A program is ill-formed if an allocation function is declared in a 9087 // namespace scope other than global scope or declared static in global 9088 // scope. 9089 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9090 return true; 9091 9092 CanQualType SizeTy = 9093 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9094 9095 // C++ [basic.stc.dynamic.allocation]p1: 9096 // The return type shall be void*. The first parameter shall have type 9097 // std::size_t. 9098 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9099 SizeTy, 9100 diag::err_operator_new_dependent_param_type, 9101 diag::err_operator_new_param_type)) 9102 return true; 9103 9104 // C++ [basic.stc.dynamic.allocation]p1: 9105 // The first parameter shall not have an associated default argument. 9106 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9107 return SemaRef.Diag(FnDecl->getLocation(), 9108 diag::err_operator_new_default_arg) 9109 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9110 9111 return false; 9112} 9113 9114static bool 9115CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9116 // C++ [basic.stc.dynamic.deallocation]p1: 9117 // A program is ill-formed if deallocation functions are declared in a 9118 // namespace scope other than global scope or declared static in global 9119 // scope. 9120 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9121 return true; 9122 9123 // C++ [basic.stc.dynamic.deallocation]p2: 9124 // Each deallocation function shall return void and its first parameter 9125 // shall be void*. 9126 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9127 SemaRef.Context.VoidPtrTy, 9128 diag::err_operator_delete_dependent_param_type, 9129 diag::err_operator_delete_param_type)) 9130 return true; 9131 9132 return false; 9133} 9134 9135/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9136/// of this overloaded operator is well-formed. If so, returns false; 9137/// otherwise, emits appropriate diagnostics and returns true. 9138bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9139 assert(FnDecl && FnDecl->isOverloadedOperator() && 9140 "Expected an overloaded operator declaration"); 9141 9142 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9143 9144 // C++ [over.oper]p5: 9145 // The allocation and deallocation functions, operator new, 9146 // operator new[], operator delete and operator delete[], are 9147 // described completely in 3.7.3. The attributes and restrictions 9148 // found in the rest of this subclause do not apply to them unless 9149 // explicitly stated in 3.7.3. 9150 if (Op == OO_Delete || Op == OO_Array_Delete) 9151 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9152 9153 if (Op == OO_New || Op == OO_Array_New) 9154 return CheckOperatorNewDeclaration(*this, FnDecl); 9155 9156 // C++ [over.oper]p6: 9157 // An operator function shall either be a non-static member 9158 // function or be a non-member function and have at least one 9159 // parameter whose type is a class, a reference to a class, an 9160 // enumeration, or a reference to an enumeration. 9161 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9162 if (MethodDecl->isStatic()) 9163 return Diag(FnDecl->getLocation(), 9164 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9165 } else { 9166 bool ClassOrEnumParam = false; 9167 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9168 ParamEnd = FnDecl->param_end(); 9169 Param != ParamEnd; ++Param) { 9170 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9171 if (ParamType->isDependentType() || ParamType->isRecordType() || 9172 ParamType->isEnumeralType()) { 9173 ClassOrEnumParam = true; 9174 break; 9175 } 9176 } 9177 9178 if (!ClassOrEnumParam) 9179 return Diag(FnDecl->getLocation(), 9180 diag::err_operator_overload_needs_class_or_enum) 9181 << FnDecl->getDeclName(); 9182 } 9183 9184 // C++ [over.oper]p8: 9185 // An operator function cannot have default arguments (8.3.6), 9186 // except where explicitly stated below. 9187 // 9188 // Only the function-call operator allows default arguments 9189 // (C++ [over.call]p1). 9190 if (Op != OO_Call) { 9191 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9192 Param != FnDecl->param_end(); ++Param) { 9193 if ((*Param)->hasDefaultArg()) 9194 return Diag((*Param)->getLocation(), 9195 diag::err_operator_overload_default_arg) 9196 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9197 } 9198 } 9199 9200 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9201 { false, false, false } 9202#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9203 , { Unary, Binary, MemberOnly } 9204#include "clang/Basic/OperatorKinds.def" 9205 }; 9206 9207 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9208 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9209 bool MustBeMemberOperator = OperatorUses[Op][2]; 9210 9211 // C++ [over.oper]p8: 9212 // [...] Operator functions cannot have more or fewer parameters 9213 // than the number required for the corresponding operator, as 9214 // described in the rest of this subclause. 9215 unsigned NumParams = FnDecl->getNumParams() 9216 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9217 if (Op != OO_Call && 9218 ((NumParams == 1 && !CanBeUnaryOperator) || 9219 (NumParams == 2 && !CanBeBinaryOperator) || 9220 (NumParams < 1) || (NumParams > 2))) { 9221 // We have the wrong number of parameters. 9222 unsigned ErrorKind; 9223 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9224 ErrorKind = 2; // 2 -> unary or binary. 9225 } else if (CanBeUnaryOperator) { 9226 ErrorKind = 0; // 0 -> unary 9227 } else { 9228 assert(CanBeBinaryOperator && 9229 "All non-call overloaded operators are unary or binary!"); 9230 ErrorKind = 1; // 1 -> binary 9231 } 9232 9233 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9234 << FnDecl->getDeclName() << NumParams << ErrorKind; 9235 } 9236 9237 // Overloaded operators other than operator() cannot be variadic. 9238 if (Op != OO_Call && 9239 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9240 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9241 << FnDecl->getDeclName(); 9242 } 9243 9244 // Some operators must be non-static member functions. 9245 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9246 return Diag(FnDecl->getLocation(), 9247 diag::err_operator_overload_must_be_member) 9248 << FnDecl->getDeclName(); 9249 } 9250 9251 // C++ [over.inc]p1: 9252 // The user-defined function called operator++ implements the 9253 // prefix and postfix ++ operator. If this function is a member 9254 // function with no parameters, or a non-member function with one 9255 // parameter of class or enumeration type, it defines the prefix 9256 // increment operator ++ for objects of that type. If the function 9257 // is a member function with one parameter (which shall be of type 9258 // int) or a non-member function with two parameters (the second 9259 // of which shall be of type int), it defines the postfix 9260 // increment operator ++ for objects of that type. 9261 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9262 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9263 bool ParamIsInt = false; 9264 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9265 ParamIsInt = BT->getKind() == BuiltinType::Int; 9266 9267 if (!ParamIsInt) 9268 return Diag(LastParam->getLocation(), 9269 diag::err_operator_overload_post_incdec_must_be_int) 9270 << LastParam->getType() << (Op == OO_MinusMinus); 9271 } 9272 9273 return false; 9274} 9275 9276/// CheckLiteralOperatorDeclaration - Check whether the declaration 9277/// of this literal operator function is well-formed. If so, returns 9278/// false; otherwise, emits appropriate diagnostics and returns true. 9279bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9280 DeclContext *DC = FnDecl->getDeclContext(); 9281 Decl::Kind Kind = DC->getDeclKind(); 9282 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9283 Kind != Decl::LinkageSpec) { 9284 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9285 << FnDecl->getDeclName(); 9286 return true; 9287 } 9288 9289 bool Valid = false; 9290 9291 // template <char...> type operator "" name() is the only valid template 9292 // signature, and the only valid signature with no parameters. 9293 if (FnDecl->param_size() == 0) { 9294 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9295 // Must have only one template parameter 9296 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9297 if (Params->size() == 1) { 9298 NonTypeTemplateParmDecl *PmDecl = 9299 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9300 9301 // The template parameter must be a char parameter pack. 9302 if (PmDecl && PmDecl->isTemplateParameterPack() && 9303 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9304 Valid = true; 9305 } 9306 } 9307 } else { 9308 // Check the first parameter 9309 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9310 9311 QualType T = (*Param)->getType(); 9312 9313 // unsigned long long int, long double, and any character type are allowed 9314 // as the only parameters. 9315 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9316 Context.hasSameType(T, Context.LongDoubleTy) || 9317 Context.hasSameType(T, Context.CharTy) || 9318 Context.hasSameType(T, Context.WCharTy) || 9319 Context.hasSameType(T, Context.Char16Ty) || 9320 Context.hasSameType(T, Context.Char32Ty)) { 9321 if (++Param == FnDecl->param_end()) 9322 Valid = true; 9323 goto FinishedParams; 9324 } 9325 9326 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9327 const PointerType *PT = T->getAs<PointerType>(); 9328 if (!PT) 9329 goto FinishedParams; 9330 T = PT->getPointeeType(); 9331 if (!T.isConstQualified()) 9332 goto FinishedParams; 9333 T = T.getUnqualifiedType(); 9334 9335 // Move on to the second parameter; 9336 ++Param; 9337 9338 // If there is no second parameter, the first must be a const char * 9339 if (Param == FnDecl->param_end()) { 9340 if (Context.hasSameType(T, Context.CharTy)) 9341 Valid = true; 9342 goto FinishedParams; 9343 } 9344 9345 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9346 // are allowed as the first parameter to a two-parameter function 9347 if (!(Context.hasSameType(T, Context.CharTy) || 9348 Context.hasSameType(T, Context.WCharTy) || 9349 Context.hasSameType(T, Context.Char16Ty) || 9350 Context.hasSameType(T, Context.Char32Ty))) 9351 goto FinishedParams; 9352 9353 // The second and final parameter must be an std::size_t 9354 T = (*Param)->getType().getUnqualifiedType(); 9355 if (Context.hasSameType(T, Context.getSizeType()) && 9356 ++Param == FnDecl->param_end()) 9357 Valid = true; 9358 } 9359 9360 // FIXME: This diagnostic is absolutely terrible. 9361FinishedParams: 9362 if (!Valid) { 9363 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9364 << FnDecl->getDeclName(); 9365 return true; 9366 } 9367 9368 StringRef LiteralName 9369 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9370 if (LiteralName[0] != '_') { 9371 // C++0x [usrlit.suffix]p1: 9372 // Literal suffix identifiers that do not start with an underscore are 9373 // reserved for future standardization. 9374 bool IsHexFloat = true; 9375 if (LiteralName.size() > 1 && 9376 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9377 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9378 if (!isdigit(LiteralName[I])) { 9379 IsHexFloat = false; 9380 break; 9381 } 9382 } 9383 } 9384 9385 if (IsHexFloat) 9386 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9387 << LiteralName; 9388 else 9389 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9390 } 9391 9392 return false; 9393} 9394 9395/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9396/// linkage specification, including the language and (if present) 9397/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9398/// the location of the language string literal, which is provided 9399/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9400/// the '{' brace. Otherwise, this linkage specification does not 9401/// have any braces. 9402Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9403 SourceLocation LangLoc, 9404 StringRef Lang, 9405 SourceLocation LBraceLoc) { 9406 LinkageSpecDecl::LanguageIDs Language; 9407 if (Lang == "\"C\"") 9408 Language = LinkageSpecDecl::lang_c; 9409 else if (Lang == "\"C++\"") 9410 Language = LinkageSpecDecl::lang_cxx; 9411 else { 9412 Diag(LangLoc, diag::err_bad_language); 9413 return 0; 9414 } 9415 9416 // FIXME: Add all the various semantics of linkage specifications 9417 9418 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9419 ExternLoc, LangLoc, Language); 9420 CurContext->addDecl(D); 9421 PushDeclContext(S, D); 9422 return D; 9423} 9424 9425/// ActOnFinishLinkageSpecification - Complete the definition of 9426/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9427/// valid, it's the position of the closing '}' brace in a linkage 9428/// specification that uses braces. 9429Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9430 Decl *LinkageSpec, 9431 SourceLocation RBraceLoc) { 9432 if (LinkageSpec) { 9433 if (RBraceLoc.isValid()) { 9434 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9435 LSDecl->setRBraceLoc(RBraceLoc); 9436 } 9437 PopDeclContext(); 9438 } 9439 return LinkageSpec; 9440} 9441 9442/// \brief Perform semantic analysis for the variable declaration that 9443/// occurs within a C++ catch clause, returning the newly-created 9444/// variable. 9445VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9446 TypeSourceInfo *TInfo, 9447 SourceLocation StartLoc, 9448 SourceLocation Loc, 9449 IdentifierInfo *Name) { 9450 bool Invalid = false; 9451 QualType ExDeclType = TInfo->getType(); 9452 9453 // Arrays and functions decay. 9454 if (ExDeclType->isArrayType()) 9455 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9456 else if (ExDeclType->isFunctionType()) 9457 ExDeclType = Context.getPointerType(ExDeclType); 9458 9459 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9460 // The exception-declaration shall not denote a pointer or reference to an 9461 // incomplete type, other than [cv] void*. 9462 // N2844 forbids rvalue references. 9463 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9464 Diag(Loc, diag::err_catch_rvalue_ref); 9465 Invalid = true; 9466 } 9467 9468 // GCC allows catching pointers and references to incomplete types 9469 // as an extension; so do we, but we warn by default. 9470 9471 QualType BaseType = ExDeclType; 9472 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9473 unsigned DK = diag::err_catch_incomplete; 9474 bool IncompleteCatchIsInvalid = true; 9475 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9476 BaseType = Ptr->getPointeeType(); 9477 Mode = 1; 9478 DK = diag::ext_catch_incomplete_ptr; 9479 IncompleteCatchIsInvalid = false; 9480 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9481 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9482 BaseType = Ref->getPointeeType(); 9483 Mode = 2; 9484 DK = diag::ext_catch_incomplete_ref; 9485 IncompleteCatchIsInvalid = false; 9486 } 9487 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9488 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9489 IncompleteCatchIsInvalid) 9490 Invalid = true; 9491 9492 if (!Invalid && !ExDeclType->isDependentType() && 9493 RequireNonAbstractType(Loc, ExDeclType, 9494 diag::err_abstract_type_in_decl, 9495 AbstractVariableType)) 9496 Invalid = true; 9497 9498 // Only the non-fragile NeXT runtime currently supports C++ catches 9499 // of ObjC types, and no runtime supports catching ObjC types by value. 9500 if (!Invalid && getLangOptions().ObjC1) { 9501 QualType T = ExDeclType; 9502 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9503 T = RT->getPointeeType(); 9504 9505 if (T->isObjCObjectType()) { 9506 Diag(Loc, diag::err_objc_object_catch); 9507 Invalid = true; 9508 } else if (T->isObjCObjectPointerType()) { 9509 if (!getLangOptions().ObjCNonFragileABI) 9510 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9511 } 9512 } 9513 9514 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9515 ExDeclType, TInfo, SC_None, SC_None); 9516 ExDecl->setExceptionVariable(true); 9517 9518 if (!Invalid && !ExDeclType->isDependentType()) { 9519 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9520 // C++ [except.handle]p16: 9521 // The object declared in an exception-declaration or, if the 9522 // exception-declaration does not specify a name, a temporary (12.2) is 9523 // copy-initialized (8.5) from the exception object. [...] 9524 // The object is destroyed when the handler exits, after the destruction 9525 // of any automatic objects initialized within the handler. 9526 // 9527 // We just pretend to initialize the object with itself, then make sure 9528 // it can be destroyed later. 9529 QualType initType = ExDeclType; 9530 9531 InitializedEntity entity = 9532 InitializedEntity::InitializeVariable(ExDecl); 9533 InitializationKind initKind = 9534 InitializationKind::CreateCopy(Loc, SourceLocation()); 9535 9536 Expr *opaqueValue = 9537 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9538 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9539 ExprResult result = sequence.Perform(*this, entity, initKind, 9540 MultiExprArg(&opaqueValue, 1)); 9541 if (result.isInvalid()) 9542 Invalid = true; 9543 else { 9544 // If the constructor used was non-trivial, set this as the 9545 // "initializer". 9546 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9547 if (!construct->getConstructor()->isTrivial()) { 9548 Expr *init = MaybeCreateExprWithCleanups(construct); 9549 ExDecl->setInit(init); 9550 } 9551 9552 // And make sure it's destructable. 9553 FinalizeVarWithDestructor(ExDecl, recordType); 9554 } 9555 } 9556 } 9557 9558 if (Invalid) 9559 ExDecl->setInvalidDecl(); 9560 9561 return ExDecl; 9562} 9563 9564/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9565/// handler. 9566Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9567 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9568 bool Invalid = D.isInvalidType(); 9569 9570 // Check for unexpanded parameter packs. 9571 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9572 UPPC_ExceptionType)) { 9573 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9574 D.getIdentifierLoc()); 9575 Invalid = true; 9576 } 9577 9578 IdentifierInfo *II = D.getIdentifier(); 9579 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9580 LookupOrdinaryName, 9581 ForRedeclaration)) { 9582 // The scope should be freshly made just for us. There is just no way 9583 // it contains any previous declaration. 9584 assert(!S->isDeclScope(PrevDecl)); 9585 if (PrevDecl->isTemplateParameter()) { 9586 // Maybe we will complain about the shadowed template parameter. 9587 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9588 PrevDecl = 0; 9589 } 9590 } 9591 9592 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9593 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9594 << D.getCXXScopeSpec().getRange(); 9595 Invalid = true; 9596 } 9597 9598 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9599 D.getSourceRange().getBegin(), 9600 D.getIdentifierLoc(), 9601 D.getIdentifier()); 9602 if (Invalid) 9603 ExDecl->setInvalidDecl(); 9604 9605 // Add the exception declaration into this scope. 9606 if (II) 9607 PushOnScopeChains(ExDecl, S); 9608 else 9609 CurContext->addDecl(ExDecl); 9610 9611 ProcessDeclAttributes(S, ExDecl, D); 9612 return ExDecl; 9613} 9614 9615Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9616 Expr *AssertExpr, 9617 Expr *AssertMessageExpr_, 9618 SourceLocation RParenLoc) { 9619 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9620 9621 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9622 llvm::APSInt Value(32); 9623 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9624 Diag(StaticAssertLoc, 9625 diag::err_static_assert_expression_is_not_constant) << 9626 AssertExpr->getSourceRange(); 9627 return 0; 9628 } 9629 9630 if (Value == 0) { 9631 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9632 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9633 } 9634 } 9635 9636 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9637 return 0; 9638 9639 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9640 AssertExpr, AssertMessage, RParenLoc); 9641 9642 CurContext->addDecl(Decl); 9643 return Decl; 9644} 9645 9646/// \brief Perform semantic analysis of the given friend type declaration. 9647/// 9648/// \returns A friend declaration that. 9649FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9650 SourceLocation FriendLoc, 9651 TypeSourceInfo *TSInfo) { 9652 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9653 9654 QualType T = TSInfo->getType(); 9655 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9656 9657 // C++03 [class.friend]p2: 9658 // An elaborated-type-specifier shall be used in a friend declaration 9659 // for a class.* 9660 // 9661 // * The class-key of the elaborated-type-specifier is required. 9662 if (!ActiveTemplateInstantiations.empty()) { 9663 // Do not complain about the form of friend template types during 9664 // template instantiation; we will already have complained when the 9665 // template was declared. 9666 } else if (!T->isElaboratedTypeSpecifier()) { 9667 // If we evaluated the type to a record type, suggest putting 9668 // a tag in front. 9669 if (const RecordType *RT = T->getAs<RecordType>()) { 9670 RecordDecl *RD = RT->getDecl(); 9671 9672 std::string InsertionText = std::string(" ") + RD->getKindName(); 9673 9674 Diag(TypeRange.getBegin(), 9675 getLangOptions().CPlusPlus0x ? 9676 diag::warn_cxx98_compat_unelaborated_friend_type : 9677 diag::ext_unelaborated_friend_type) 9678 << (unsigned) RD->getTagKind() 9679 << T 9680 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9681 InsertionText); 9682 } else { 9683 Diag(FriendLoc, 9684 getLangOptions().CPlusPlus0x ? 9685 diag::warn_cxx98_compat_nonclass_type_friend : 9686 diag::ext_nonclass_type_friend) 9687 << T 9688 << SourceRange(FriendLoc, TypeRange.getEnd()); 9689 } 9690 } else if (T->getAs<EnumType>()) { 9691 Diag(FriendLoc, 9692 getLangOptions().CPlusPlus0x ? 9693 diag::warn_cxx98_compat_enum_friend : 9694 diag::ext_enum_friend) 9695 << T 9696 << SourceRange(FriendLoc, TypeRange.getEnd()); 9697 } 9698 9699 // C++0x [class.friend]p3: 9700 // If the type specifier in a friend declaration designates a (possibly 9701 // cv-qualified) class type, that class is declared as a friend; otherwise, 9702 // the friend declaration is ignored. 9703 9704 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9705 // in [class.friend]p3 that we do not implement. 9706 9707 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9708} 9709 9710/// Handle a friend tag declaration where the scope specifier was 9711/// templated. 9712Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9713 unsigned TagSpec, SourceLocation TagLoc, 9714 CXXScopeSpec &SS, 9715 IdentifierInfo *Name, SourceLocation NameLoc, 9716 AttributeList *Attr, 9717 MultiTemplateParamsArg TempParamLists) { 9718 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9719 9720 bool isExplicitSpecialization = false; 9721 bool Invalid = false; 9722 9723 if (TemplateParameterList *TemplateParams 9724 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9725 TempParamLists.get(), 9726 TempParamLists.size(), 9727 /*friend*/ true, 9728 isExplicitSpecialization, 9729 Invalid)) { 9730 if (TemplateParams->size() > 0) { 9731 // This is a declaration of a class template. 9732 if (Invalid) 9733 return 0; 9734 9735 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9736 SS, Name, NameLoc, Attr, 9737 TemplateParams, AS_public, 9738 /*ModulePrivateLoc=*/SourceLocation(), 9739 TempParamLists.size() - 1, 9740 (TemplateParameterList**) TempParamLists.release()).take(); 9741 } else { 9742 // The "template<>" header is extraneous. 9743 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9744 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9745 isExplicitSpecialization = true; 9746 } 9747 } 9748 9749 if (Invalid) return 0; 9750 9751 bool isAllExplicitSpecializations = true; 9752 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9753 if (TempParamLists.get()[I]->size()) { 9754 isAllExplicitSpecializations = false; 9755 break; 9756 } 9757 } 9758 9759 // FIXME: don't ignore attributes. 9760 9761 // If it's explicit specializations all the way down, just forget 9762 // about the template header and build an appropriate non-templated 9763 // friend. TODO: for source fidelity, remember the headers. 9764 if (isAllExplicitSpecializations) { 9765 if (SS.isEmpty()) { 9766 bool Owned = false; 9767 bool IsDependent = false; 9768 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9769 Attr, AS_public, 9770 /*ModulePrivateLoc=*/SourceLocation(), 9771 MultiTemplateParamsArg(), Owned, IsDependent, 9772 /*ScopedEnum=*/false, 9773 /*ScopedEnumUsesClassTag=*/false, 9774 /*UnderlyingType=*/TypeResult()); 9775 } 9776 9777 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9778 ElaboratedTypeKeyword Keyword 9779 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9780 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9781 *Name, NameLoc); 9782 if (T.isNull()) 9783 return 0; 9784 9785 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9786 if (isa<DependentNameType>(T)) { 9787 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9788 TL.setKeywordLoc(TagLoc); 9789 TL.setQualifierLoc(QualifierLoc); 9790 TL.setNameLoc(NameLoc); 9791 } else { 9792 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9793 TL.setKeywordLoc(TagLoc); 9794 TL.setQualifierLoc(QualifierLoc); 9795 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9796 } 9797 9798 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9799 TSI, FriendLoc); 9800 Friend->setAccess(AS_public); 9801 CurContext->addDecl(Friend); 9802 return Friend; 9803 } 9804 9805 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9806 9807 9808 9809 // Handle the case of a templated-scope friend class. e.g. 9810 // template <class T> class A<T>::B; 9811 // FIXME: we don't support these right now. 9812 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9813 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9814 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9815 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9816 TL.setKeywordLoc(TagLoc); 9817 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9818 TL.setNameLoc(NameLoc); 9819 9820 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9821 TSI, FriendLoc); 9822 Friend->setAccess(AS_public); 9823 Friend->setUnsupportedFriend(true); 9824 CurContext->addDecl(Friend); 9825 return Friend; 9826} 9827 9828 9829/// Handle a friend type declaration. This works in tandem with 9830/// ActOnTag. 9831/// 9832/// Notes on friend class templates: 9833/// 9834/// We generally treat friend class declarations as if they were 9835/// declaring a class. So, for example, the elaborated type specifier 9836/// in a friend declaration is required to obey the restrictions of a 9837/// class-head (i.e. no typedefs in the scope chain), template 9838/// parameters are required to match up with simple template-ids, &c. 9839/// However, unlike when declaring a template specialization, it's 9840/// okay to refer to a template specialization without an empty 9841/// template parameter declaration, e.g. 9842/// friend class A<T>::B<unsigned>; 9843/// We permit this as a special case; if there are any template 9844/// parameters present at all, require proper matching, i.e. 9845/// template <> template <class T> friend class A<int>::B; 9846Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9847 MultiTemplateParamsArg TempParams) { 9848 SourceLocation Loc = DS.getSourceRange().getBegin(); 9849 9850 assert(DS.isFriendSpecified()); 9851 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9852 9853 // Try to convert the decl specifier to a type. This works for 9854 // friend templates because ActOnTag never produces a ClassTemplateDecl 9855 // for a TUK_Friend. 9856 Declarator TheDeclarator(DS, Declarator::MemberContext); 9857 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9858 QualType T = TSI->getType(); 9859 if (TheDeclarator.isInvalidType()) 9860 return 0; 9861 9862 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9863 return 0; 9864 9865 // This is definitely an error in C++98. It's probably meant to 9866 // be forbidden in C++0x, too, but the specification is just 9867 // poorly written. 9868 // 9869 // The problem is with declarations like the following: 9870 // template <T> friend A<T>::foo; 9871 // where deciding whether a class C is a friend or not now hinges 9872 // on whether there exists an instantiation of A that causes 9873 // 'foo' to equal C. There are restrictions on class-heads 9874 // (which we declare (by fiat) elaborated friend declarations to 9875 // be) that makes this tractable. 9876 // 9877 // FIXME: handle "template <> friend class A<T>;", which 9878 // is possibly well-formed? Who even knows? 9879 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9880 Diag(Loc, diag::err_tagless_friend_type_template) 9881 << DS.getSourceRange(); 9882 return 0; 9883 } 9884 9885 // C++98 [class.friend]p1: A friend of a class is a function 9886 // or class that is not a member of the class . . . 9887 // This is fixed in DR77, which just barely didn't make the C++03 9888 // deadline. It's also a very silly restriction that seriously 9889 // affects inner classes and which nobody else seems to implement; 9890 // thus we never diagnose it, not even in -pedantic. 9891 // 9892 // But note that we could warn about it: it's always useless to 9893 // friend one of your own members (it's not, however, worthless to 9894 // friend a member of an arbitrary specialization of your template). 9895 9896 Decl *D; 9897 if (unsigned NumTempParamLists = TempParams.size()) 9898 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9899 NumTempParamLists, 9900 TempParams.release(), 9901 TSI, 9902 DS.getFriendSpecLoc()); 9903 else 9904 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9905 9906 if (!D) 9907 return 0; 9908 9909 D->setAccess(AS_public); 9910 CurContext->addDecl(D); 9911 9912 return D; 9913} 9914 9915Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9916 MultiTemplateParamsArg TemplateParams) { 9917 const DeclSpec &DS = D.getDeclSpec(); 9918 9919 assert(DS.isFriendSpecified()); 9920 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9921 9922 SourceLocation Loc = D.getIdentifierLoc(); 9923 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9924 9925 // C++ [class.friend]p1 9926 // A friend of a class is a function or class.... 9927 // Note that this sees through typedefs, which is intended. 9928 // It *doesn't* see through dependent types, which is correct 9929 // according to [temp.arg.type]p3: 9930 // If a declaration acquires a function type through a 9931 // type dependent on a template-parameter and this causes 9932 // a declaration that does not use the syntactic form of a 9933 // function declarator to have a function type, the program 9934 // is ill-formed. 9935 if (!TInfo->getType()->isFunctionType()) { 9936 Diag(Loc, diag::err_unexpected_friend); 9937 9938 // It might be worthwhile to try to recover by creating an 9939 // appropriate declaration. 9940 return 0; 9941 } 9942 9943 // C++ [namespace.memdef]p3 9944 // - If a friend declaration in a non-local class first declares a 9945 // class or function, the friend class or function is a member 9946 // of the innermost enclosing namespace. 9947 // - The name of the friend is not found by simple name lookup 9948 // until a matching declaration is provided in that namespace 9949 // scope (either before or after the class declaration granting 9950 // friendship). 9951 // - If a friend function is called, its name may be found by the 9952 // name lookup that considers functions from namespaces and 9953 // classes associated with the types of the function arguments. 9954 // - When looking for a prior declaration of a class or a function 9955 // declared as a friend, scopes outside the innermost enclosing 9956 // namespace scope are not considered. 9957 9958 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9959 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9960 DeclarationName Name = NameInfo.getName(); 9961 assert(Name); 9962 9963 // Check for unexpanded parameter packs. 9964 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9965 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9966 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9967 return 0; 9968 9969 // The context we found the declaration in, or in which we should 9970 // create the declaration. 9971 DeclContext *DC; 9972 Scope *DCScope = S; 9973 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9974 ForRedeclaration); 9975 9976 // FIXME: there are different rules in local classes 9977 9978 // There are four cases here. 9979 // - There's no scope specifier, in which case we just go to the 9980 // appropriate scope and look for a function or function template 9981 // there as appropriate. 9982 // Recover from invalid scope qualifiers as if they just weren't there. 9983 if (SS.isInvalid() || !SS.isSet()) { 9984 // C++0x [namespace.memdef]p3: 9985 // If the name in a friend declaration is neither qualified nor 9986 // a template-id and the declaration is a function or an 9987 // elaborated-type-specifier, the lookup to determine whether 9988 // the entity has been previously declared shall not consider 9989 // any scopes outside the innermost enclosing namespace. 9990 // C++0x [class.friend]p11: 9991 // If a friend declaration appears in a local class and the name 9992 // specified is an unqualified name, a prior declaration is 9993 // looked up without considering scopes that are outside the 9994 // innermost enclosing non-class scope. For a friend function 9995 // declaration, if there is no prior declaration, the program is 9996 // ill-formed. 9997 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9998 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9999 10000 // Find the appropriate context according to the above. 10001 DC = CurContext; 10002 while (true) { 10003 // Skip class contexts. If someone can cite chapter and verse 10004 // for this behavior, that would be nice --- it's what GCC and 10005 // EDG do, and it seems like a reasonable intent, but the spec 10006 // really only says that checks for unqualified existing 10007 // declarations should stop at the nearest enclosing namespace, 10008 // not that they should only consider the nearest enclosing 10009 // namespace. 10010 while (DC->isRecord()) 10011 DC = DC->getParent(); 10012 10013 LookupQualifiedName(Previous, DC); 10014 10015 // TODO: decide what we think about using declarations. 10016 if (isLocal || !Previous.empty()) 10017 break; 10018 10019 if (isTemplateId) { 10020 if (isa<TranslationUnitDecl>(DC)) break; 10021 } else { 10022 if (DC->isFileContext()) break; 10023 } 10024 DC = DC->getParent(); 10025 } 10026 10027 // C++ [class.friend]p1: A friend of a class is a function or 10028 // class that is not a member of the class . . . 10029 // C++11 changes this for both friend types and functions. 10030 // Most C++ 98 compilers do seem to give an error here, so 10031 // we do, too. 10032 if (!Previous.empty() && DC->Equals(CurContext)) 10033 Diag(DS.getFriendSpecLoc(), 10034 getLangOptions().CPlusPlus0x ? 10035 diag::warn_cxx98_compat_friend_is_member : 10036 diag::err_friend_is_member); 10037 10038 DCScope = getScopeForDeclContext(S, DC); 10039 10040 // C++ [class.friend]p6: 10041 // A function can be defined in a friend declaration of a class if and 10042 // only if the class is a non-local class (9.8), the function name is 10043 // unqualified, and the function has namespace scope. 10044 if (isLocal && D.isFunctionDefinition()) { 10045 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10046 } 10047 10048 // - There's a non-dependent scope specifier, in which case we 10049 // compute it and do a previous lookup there for a function 10050 // or function template. 10051 } else if (!SS.getScopeRep()->isDependent()) { 10052 DC = computeDeclContext(SS); 10053 if (!DC) return 0; 10054 10055 if (RequireCompleteDeclContext(SS, DC)) return 0; 10056 10057 LookupQualifiedName(Previous, DC); 10058 10059 // Ignore things found implicitly in the wrong scope. 10060 // TODO: better diagnostics for this case. Suggesting the right 10061 // qualified scope would be nice... 10062 LookupResult::Filter F = Previous.makeFilter(); 10063 while (F.hasNext()) { 10064 NamedDecl *D = F.next(); 10065 if (!DC->InEnclosingNamespaceSetOf( 10066 D->getDeclContext()->getRedeclContext())) 10067 F.erase(); 10068 } 10069 F.done(); 10070 10071 if (Previous.empty()) { 10072 D.setInvalidType(); 10073 Diag(Loc, diag::err_qualified_friend_not_found) 10074 << Name << TInfo->getType(); 10075 return 0; 10076 } 10077 10078 // C++ [class.friend]p1: A friend of a class is a function or 10079 // class that is not a member of the class . . . 10080 if (DC->Equals(CurContext)) 10081 Diag(DS.getFriendSpecLoc(), 10082 getLangOptions().CPlusPlus0x ? 10083 diag::warn_cxx98_compat_friend_is_member : 10084 diag::err_friend_is_member); 10085 10086 if (D.isFunctionDefinition()) { 10087 // C++ [class.friend]p6: 10088 // A function can be defined in a friend declaration of a class if and 10089 // only if the class is a non-local class (9.8), the function name is 10090 // unqualified, and the function has namespace scope. 10091 SemaDiagnosticBuilder DB 10092 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10093 10094 DB << SS.getScopeRep(); 10095 if (DC->isFileContext()) 10096 DB << FixItHint::CreateRemoval(SS.getRange()); 10097 SS.clear(); 10098 } 10099 10100 // - There's a scope specifier that does not match any template 10101 // parameter lists, in which case we use some arbitrary context, 10102 // create a method or method template, and wait for instantiation. 10103 // - There's a scope specifier that does match some template 10104 // parameter lists, which we don't handle right now. 10105 } else { 10106 if (D.isFunctionDefinition()) { 10107 // C++ [class.friend]p6: 10108 // A function can be defined in a friend declaration of a class if and 10109 // only if the class is a non-local class (9.8), the function name is 10110 // unqualified, and the function has namespace scope. 10111 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10112 << SS.getScopeRep(); 10113 } 10114 10115 DC = CurContext; 10116 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10117 } 10118 10119 if (!DC->isRecord()) { 10120 // This implies that it has to be an operator or function. 10121 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10122 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10123 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10124 Diag(Loc, diag::err_introducing_special_friend) << 10125 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10126 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10127 return 0; 10128 } 10129 } 10130 10131 bool AddToScope = true; 10132 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10133 move(TemplateParams), AddToScope); 10134 if (!ND) return 0; 10135 10136 assert(ND->getDeclContext() == DC); 10137 assert(ND->getLexicalDeclContext() == CurContext); 10138 10139 // Add the function declaration to the appropriate lookup tables, 10140 // adjusting the redeclarations list as necessary. We don't 10141 // want to do this yet if the friending class is dependent. 10142 // 10143 // Also update the scope-based lookup if the target context's 10144 // lookup context is in lexical scope. 10145 if (!CurContext->isDependentContext()) { 10146 DC = DC->getRedeclContext(); 10147 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10148 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10149 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10150 } 10151 10152 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10153 D.getIdentifierLoc(), ND, 10154 DS.getFriendSpecLoc()); 10155 FrD->setAccess(AS_public); 10156 CurContext->addDecl(FrD); 10157 10158 if (ND->isInvalidDecl()) 10159 FrD->setInvalidDecl(); 10160 else { 10161 FunctionDecl *FD; 10162 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10163 FD = FTD->getTemplatedDecl(); 10164 else 10165 FD = cast<FunctionDecl>(ND); 10166 10167 // Mark templated-scope function declarations as unsupported. 10168 if (FD->getNumTemplateParameterLists()) 10169 FrD->setUnsupportedFriend(true); 10170 } 10171 10172 return ND; 10173} 10174 10175void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10176 AdjustDeclIfTemplate(Dcl); 10177 10178 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10179 if (!Fn) { 10180 Diag(DelLoc, diag::err_deleted_non_function); 10181 return; 10182 } 10183 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10184 Diag(DelLoc, diag::err_deleted_decl_not_first); 10185 Diag(Prev->getLocation(), diag::note_previous_declaration); 10186 // If the declaration wasn't the first, we delete the function anyway for 10187 // recovery. 10188 } 10189 Fn->setDeletedAsWritten(); 10190} 10191 10192void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10193 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10194 10195 if (MD) { 10196 if (MD->getParent()->isDependentType()) { 10197 MD->setDefaulted(); 10198 MD->setExplicitlyDefaulted(); 10199 return; 10200 } 10201 10202 CXXSpecialMember Member = getSpecialMember(MD); 10203 if (Member == CXXInvalid) { 10204 Diag(DefaultLoc, diag::err_default_special_members); 10205 return; 10206 } 10207 10208 MD->setDefaulted(); 10209 MD->setExplicitlyDefaulted(); 10210 10211 // If this definition appears within the record, do the checking when 10212 // the record is complete. 10213 const FunctionDecl *Primary = MD; 10214 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10215 // Find the uninstantiated declaration that actually had the '= default' 10216 // on it. 10217 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10218 10219 if (Primary == Primary->getCanonicalDecl()) 10220 return; 10221 10222 switch (Member) { 10223 case CXXDefaultConstructor: { 10224 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10225 CheckExplicitlyDefaultedDefaultConstructor(CD); 10226 if (!CD->isInvalidDecl()) 10227 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10228 break; 10229 } 10230 10231 case CXXCopyConstructor: { 10232 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10233 CheckExplicitlyDefaultedCopyConstructor(CD); 10234 if (!CD->isInvalidDecl()) 10235 DefineImplicitCopyConstructor(DefaultLoc, CD); 10236 break; 10237 } 10238 10239 case CXXCopyAssignment: { 10240 CheckExplicitlyDefaultedCopyAssignment(MD); 10241 if (!MD->isInvalidDecl()) 10242 DefineImplicitCopyAssignment(DefaultLoc, MD); 10243 break; 10244 } 10245 10246 case CXXDestructor: { 10247 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10248 CheckExplicitlyDefaultedDestructor(DD); 10249 if (!DD->isInvalidDecl()) 10250 DefineImplicitDestructor(DefaultLoc, DD); 10251 break; 10252 } 10253 10254 case CXXMoveConstructor: { 10255 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10256 CheckExplicitlyDefaultedMoveConstructor(CD); 10257 if (!CD->isInvalidDecl()) 10258 DefineImplicitMoveConstructor(DefaultLoc, CD); 10259 break; 10260 } 10261 10262 case CXXMoveAssignment: { 10263 CheckExplicitlyDefaultedMoveAssignment(MD); 10264 if (!MD->isInvalidDecl()) 10265 DefineImplicitMoveAssignment(DefaultLoc, MD); 10266 break; 10267 } 10268 10269 case CXXInvalid: 10270 llvm_unreachable("Invalid special member."); 10271 } 10272 } else { 10273 Diag(DefaultLoc, diag::err_default_special_members); 10274 } 10275} 10276 10277static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10278 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10279 Stmt *SubStmt = *CI; 10280 if (!SubStmt) 10281 continue; 10282 if (isa<ReturnStmt>(SubStmt)) 10283 Self.Diag(SubStmt->getSourceRange().getBegin(), 10284 diag::err_return_in_constructor_handler); 10285 if (!isa<Expr>(SubStmt)) 10286 SearchForReturnInStmt(Self, SubStmt); 10287 } 10288} 10289 10290void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10291 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10292 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10293 SearchForReturnInStmt(*this, Handler); 10294 } 10295} 10296 10297bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10298 const CXXMethodDecl *Old) { 10299 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10300 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10301 10302 if (Context.hasSameType(NewTy, OldTy) || 10303 NewTy->isDependentType() || OldTy->isDependentType()) 10304 return false; 10305 10306 // Check if the return types are covariant 10307 QualType NewClassTy, OldClassTy; 10308 10309 /// Both types must be pointers or references to classes. 10310 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10311 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10312 NewClassTy = NewPT->getPointeeType(); 10313 OldClassTy = OldPT->getPointeeType(); 10314 } 10315 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10316 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10317 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10318 NewClassTy = NewRT->getPointeeType(); 10319 OldClassTy = OldRT->getPointeeType(); 10320 } 10321 } 10322 } 10323 10324 // The return types aren't either both pointers or references to a class type. 10325 if (NewClassTy.isNull()) { 10326 Diag(New->getLocation(), 10327 diag::err_different_return_type_for_overriding_virtual_function) 10328 << New->getDeclName() << NewTy << OldTy; 10329 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10330 10331 return true; 10332 } 10333 10334 // C++ [class.virtual]p6: 10335 // If the return type of D::f differs from the return type of B::f, the 10336 // class type in the return type of D::f shall be complete at the point of 10337 // declaration of D::f or shall be the class type D. 10338 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10339 if (!RT->isBeingDefined() && 10340 RequireCompleteType(New->getLocation(), NewClassTy, 10341 PDiag(diag::err_covariant_return_incomplete) 10342 << New->getDeclName())) 10343 return true; 10344 } 10345 10346 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10347 // Check if the new class derives from the old class. 10348 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10349 Diag(New->getLocation(), 10350 diag::err_covariant_return_not_derived) 10351 << New->getDeclName() << NewTy << OldTy; 10352 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10353 return true; 10354 } 10355 10356 // Check if we the conversion from derived to base is valid. 10357 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10358 diag::err_covariant_return_inaccessible_base, 10359 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10360 // FIXME: Should this point to the return type? 10361 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10362 // FIXME: this note won't trigger for delayed access control 10363 // diagnostics, and it's impossible to get an undelayed error 10364 // here from access control during the original parse because 10365 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10366 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10367 return true; 10368 } 10369 } 10370 10371 // The qualifiers of the return types must be the same. 10372 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10373 Diag(New->getLocation(), 10374 diag::err_covariant_return_type_different_qualifications) 10375 << New->getDeclName() << NewTy << OldTy; 10376 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10377 return true; 10378 }; 10379 10380 10381 // The new class type must have the same or less qualifiers as the old type. 10382 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10383 Diag(New->getLocation(), 10384 diag::err_covariant_return_type_class_type_more_qualified) 10385 << New->getDeclName() << NewTy << OldTy; 10386 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10387 return true; 10388 }; 10389 10390 return false; 10391} 10392 10393/// \brief Mark the given method pure. 10394/// 10395/// \param Method the method to be marked pure. 10396/// 10397/// \param InitRange the source range that covers the "0" initializer. 10398bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10399 SourceLocation EndLoc = InitRange.getEnd(); 10400 if (EndLoc.isValid()) 10401 Method->setRangeEnd(EndLoc); 10402 10403 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10404 Method->setPure(); 10405 return false; 10406 } 10407 10408 if (!Method->isInvalidDecl()) 10409 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10410 << Method->getDeclName() << InitRange; 10411 return true; 10412} 10413 10414/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10415/// an initializer for the out-of-line declaration 'Dcl'. The scope 10416/// is a fresh scope pushed for just this purpose. 10417/// 10418/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10419/// static data member of class X, names should be looked up in the scope of 10420/// class X. 10421void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10422 // If there is no declaration, there was an error parsing it. 10423 if (D == 0 || D->isInvalidDecl()) return; 10424 10425 // We should only get called for declarations with scope specifiers, like: 10426 // int foo::bar; 10427 assert(D->isOutOfLine()); 10428 EnterDeclaratorContext(S, D->getDeclContext()); 10429} 10430 10431/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10432/// initializer for the out-of-line declaration 'D'. 10433void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10434 // If there is no declaration, there was an error parsing it. 10435 if (D == 0 || D->isInvalidDecl()) return; 10436 10437 assert(D->isOutOfLine()); 10438 ExitDeclaratorContext(S); 10439} 10440 10441/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10442/// C++ if/switch/while/for statement. 10443/// e.g: "if (int x = f()) {...}" 10444DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10445 // C++ 6.4p2: 10446 // The declarator shall not specify a function or an array. 10447 // The type-specifier-seq shall not contain typedef and shall not declare a 10448 // new class or enumeration. 10449 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10450 "Parser allowed 'typedef' as storage class of condition decl."); 10451 10452 Decl *Dcl = ActOnDeclarator(S, D); 10453 if (!Dcl) 10454 return true; 10455 10456 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10457 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10458 << D.getSourceRange(); 10459 return true; 10460 } 10461 10462 return Dcl; 10463} 10464 10465void Sema::LoadExternalVTableUses() { 10466 if (!ExternalSource) 10467 return; 10468 10469 SmallVector<ExternalVTableUse, 4> VTables; 10470 ExternalSource->ReadUsedVTables(VTables); 10471 SmallVector<VTableUse, 4> NewUses; 10472 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10473 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10474 = VTablesUsed.find(VTables[I].Record); 10475 // Even if a definition wasn't required before, it may be required now. 10476 if (Pos != VTablesUsed.end()) { 10477 if (!Pos->second && VTables[I].DefinitionRequired) 10478 Pos->second = true; 10479 continue; 10480 } 10481 10482 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10483 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10484 } 10485 10486 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10487} 10488 10489void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10490 bool DefinitionRequired) { 10491 // Ignore any vtable uses in unevaluated operands or for classes that do 10492 // not have a vtable. 10493 if (!Class->isDynamicClass() || Class->isDependentContext() || 10494 CurContext->isDependentContext() || 10495 ExprEvalContexts.back().Context == Unevaluated) 10496 return; 10497 10498 // Try to insert this class into the map. 10499 LoadExternalVTableUses(); 10500 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10501 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10502 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10503 if (!Pos.second) { 10504 // If we already had an entry, check to see if we are promoting this vtable 10505 // to required a definition. If so, we need to reappend to the VTableUses 10506 // list, since we may have already processed the first entry. 10507 if (DefinitionRequired && !Pos.first->second) { 10508 Pos.first->second = true; 10509 } else { 10510 // Otherwise, we can early exit. 10511 return; 10512 } 10513 } 10514 10515 // Local classes need to have their virtual members marked 10516 // immediately. For all other classes, we mark their virtual members 10517 // at the end of the translation unit. 10518 if (Class->isLocalClass()) 10519 MarkVirtualMembersReferenced(Loc, Class); 10520 else 10521 VTableUses.push_back(std::make_pair(Class, Loc)); 10522} 10523 10524bool Sema::DefineUsedVTables() { 10525 LoadExternalVTableUses(); 10526 if (VTableUses.empty()) 10527 return false; 10528 10529 // Note: The VTableUses vector could grow as a result of marking 10530 // the members of a class as "used", so we check the size each 10531 // time through the loop and prefer indices (with are stable) to 10532 // iterators (which are not). 10533 bool DefinedAnything = false; 10534 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10535 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10536 if (!Class) 10537 continue; 10538 10539 SourceLocation Loc = VTableUses[I].second; 10540 10541 // If this class has a key function, but that key function is 10542 // defined in another translation unit, we don't need to emit the 10543 // vtable even though we're using it. 10544 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10545 if (KeyFunction && !KeyFunction->hasBody()) { 10546 switch (KeyFunction->getTemplateSpecializationKind()) { 10547 case TSK_Undeclared: 10548 case TSK_ExplicitSpecialization: 10549 case TSK_ExplicitInstantiationDeclaration: 10550 // The key function is in another translation unit. 10551 continue; 10552 10553 case TSK_ExplicitInstantiationDefinition: 10554 case TSK_ImplicitInstantiation: 10555 // We will be instantiating the key function. 10556 break; 10557 } 10558 } else if (!KeyFunction) { 10559 // If we have a class with no key function that is the subject 10560 // of an explicit instantiation declaration, suppress the 10561 // vtable; it will live with the explicit instantiation 10562 // definition. 10563 bool IsExplicitInstantiationDeclaration 10564 = Class->getTemplateSpecializationKind() 10565 == TSK_ExplicitInstantiationDeclaration; 10566 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10567 REnd = Class->redecls_end(); 10568 R != REnd; ++R) { 10569 TemplateSpecializationKind TSK 10570 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10571 if (TSK == TSK_ExplicitInstantiationDeclaration) 10572 IsExplicitInstantiationDeclaration = true; 10573 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10574 IsExplicitInstantiationDeclaration = false; 10575 break; 10576 } 10577 } 10578 10579 if (IsExplicitInstantiationDeclaration) 10580 continue; 10581 } 10582 10583 // Mark all of the virtual members of this class as referenced, so 10584 // that we can build a vtable. Then, tell the AST consumer that a 10585 // vtable for this class is required. 10586 DefinedAnything = true; 10587 MarkVirtualMembersReferenced(Loc, Class); 10588 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10589 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10590 10591 // Optionally warn if we're emitting a weak vtable. 10592 if (Class->getLinkage() == ExternalLinkage && 10593 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10594 const FunctionDecl *KeyFunctionDef = 0; 10595 if (!KeyFunction || 10596 (KeyFunction->hasBody(KeyFunctionDef) && 10597 KeyFunctionDef->isInlined())) 10598 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10599 } 10600 } 10601 VTableUses.clear(); 10602 10603 return DefinedAnything; 10604} 10605 10606void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10607 const CXXRecordDecl *RD) { 10608 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10609 e = RD->method_end(); i != e; ++i) { 10610 CXXMethodDecl *MD = *i; 10611 10612 // C++ [basic.def.odr]p2: 10613 // [...] A virtual member function is used if it is not pure. [...] 10614 if (MD->isVirtual() && !MD->isPure()) 10615 MarkDeclarationReferenced(Loc, MD); 10616 } 10617 10618 // Only classes that have virtual bases need a VTT. 10619 if (RD->getNumVBases() == 0) 10620 return; 10621 10622 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10623 e = RD->bases_end(); i != e; ++i) { 10624 const CXXRecordDecl *Base = 10625 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10626 if (Base->getNumVBases() == 0) 10627 continue; 10628 MarkVirtualMembersReferenced(Loc, Base); 10629 } 10630} 10631 10632/// SetIvarInitializers - This routine builds initialization ASTs for the 10633/// Objective-C implementation whose ivars need be initialized. 10634void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10635 if (!getLangOptions().CPlusPlus) 10636 return; 10637 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10638 SmallVector<ObjCIvarDecl*, 8> ivars; 10639 CollectIvarsToConstructOrDestruct(OID, ivars); 10640 if (ivars.empty()) 10641 return; 10642 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10643 for (unsigned i = 0; i < ivars.size(); i++) { 10644 FieldDecl *Field = ivars[i]; 10645 if (Field->isInvalidDecl()) 10646 continue; 10647 10648 CXXCtorInitializer *Member; 10649 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10650 InitializationKind InitKind = 10651 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10652 10653 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10654 ExprResult MemberInit = 10655 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10656 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10657 // Note, MemberInit could actually come back empty if no initialization 10658 // is required (e.g., because it would call a trivial default constructor) 10659 if (!MemberInit.get() || MemberInit.isInvalid()) 10660 continue; 10661 10662 Member = 10663 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10664 SourceLocation(), 10665 MemberInit.takeAs<Expr>(), 10666 SourceLocation()); 10667 AllToInit.push_back(Member); 10668 10669 // Be sure that the destructor is accessible and is marked as referenced. 10670 if (const RecordType *RecordTy 10671 = Context.getBaseElementType(Field->getType()) 10672 ->getAs<RecordType>()) { 10673 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10674 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10675 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10676 CheckDestructorAccess(Field->getLocation(), Destructor, 10677 PDiag(diag::err_access_dtor_ivar) 10678 << Context.getBaseElementType(Field->getType())); 10679 } 10680 } 10681 } 10682 ObjCImplementation->setIvarInitializers(Context, 10683 AllToInit.data(), AllToInit.size()); 10684 } 10685} 10686 10687static 10688void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10689 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10690 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10691 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10692 Sema &S) { 10693 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10694 CE = Current.end(); 10695 if (Ctor->isInvalidDecl()) 10696 return; 10697 10698 const FunctionDecl *FNTarget = 0; 10699 CXXConstructorDecl *Target; 10700 10701 // We ignore the result here since if we don't have a body, Target will be 10702 // null below. 10703 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10704 Target 10705= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10706 10707 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10708 // Avoid dereferencing a null pointer here. 10709 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10710 10711 if (!Current.insert(Canonical)) 10712 return; 10713 10714 // We know that beyond here, we aren't chaining into a cycle. 10715 if (!Target || !Target->isDelegatingConstructor() || 10716 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10717 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10718 Valid.insert(*CI); 10719 Current.clear(); 10720 // We've hit a cycle. 10721 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10722 Current.count(TCanonical)) { 10723 // If we haven't diagnosed this cycle yet, do so now. 10724 if (!Invalid.count(TCanonical)) { 10725 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10726 diag::warn_delegating_ctor_cycle) 10727 << Ctor; 10728 10729 // Don't add a note for a function delegating directo to itself. 10730 if (TCanonical != Canonical) 10731 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10732 10733 CXXConstructorDecl *C = Target; 10734 while (C->getCanonicalDecl() != Canonical) { 10735 (void)C->getTargetConstructor()->hasBody(FNTarget); 10736 assert(FNTarget && "Ctor cycle through bodiless function"); 10737 10738 C 10739 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10740 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10741 } 10742 } 10743 10744 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10745 Invalid.insert(*CI); 10746 Current.clear(); 10747 } else { 10748 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10749 } 10750} 10751 10752 10753void Sema::CheckDelegatingCtorCycles() { 10754 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10755 10756 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10757 CE = Current.end(); 10758 10759 for (DelegatingCtorDeclsType::iterator 10760 I = DelegatingCtorDecls.begin(ExternalSource), 10761 E = DelegatingCtorDecls.end(); 10762 I != E; ++I) { 10763 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10764 } 10765 10766 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10767 (*CI)->setInvalidDecl(); 10768} 10769 10770/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10771Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10772 // Implicitly declared functions (e.g. copy constructors) are 10773 // __host__ __device__ 10774 if (D->isImplicit()) 10775 return CFT_HostDevice; 10776 10777 if (D->hasAttr<CUDAGlobalAttr>()) 10778 return CFT_Global; 10779 10780 if (D->hasAttr<CUDADeviceAttr>()) { 10781 if (D->hasAttr<CUDAHostAttr>()) 10782 return CFT_HostDevice; 10783 else 10784 return CFT_Device; 10785 } 10786 10787 return CFT_Host; 10788} 10789 10790bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10791 CUDAFunctionTarget CalleeTarget) { 10792 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10793 // Callable from the device only." 10794 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10795 return true; 10796 10797 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10798 // Callable from the host only." 10799 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10800 // Callable from the host only." 10801 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10802 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10803 return true; 10804 10805 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10806 return true; 10807 10808 return false; 10809} 10810