SemaDeclCXX.cpp revision 66f85713bd0d22f867efa8e9fb0037befdd6b151
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 CXXRecordDecl *ClassDecl) { 2129 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2130 if (!LangOpts.CPlusPlus0x) 2131 return Diag(NameLoc, diag::err_delegating_ctor) 2132 << TInfo->getTypeLoc().getLocalSourceRange(); 2133 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2134 2135 // Initialize the object. 2136 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2137 QualType(ClassDecl->getTypeForDecl(), 0)); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2143 if (DelegationInit.isInvalid()) 2144 return true; 2145 2146 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2147 "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2159 DelegationInit.takeAs<Expr>(), 2160 Args.getEndLoc()); 2161} 2162 2163MemInitResult 2164Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2165 const MultiInitializer &Args, 2166 CXXRecordDecl *ClassDecl, 2167 SourceLocation EllipsisLoc) { 2168 bool HasDependentArg = Args.isTypeDependent(); 2169 2170 SourceLocation BaseLoc 2171 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2172 2173 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2174 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2175 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2176 2177 // C++ [class.base.init]p2: 2178 // [...] Unless the mem-initializer-id names a nonstatic data 2179 // member of the constructor's class or a direct or virtual base 2180 // of that class, the mem-initializer is ill-formed. A 2181 // mem-initializer-list can initialize a base class using any 2182 // name that denotes that base class type. 2183 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2184 2185 if (EllipsisLoc.isValid()) { 2186 // This is a pack expansion. 2187 if (!BaseType->containsUnexpandedParameterPack()) { 2188 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2189 << SourceRange(BaseLoc, Args.getEndLoc()); 2190 2191 EllipsisLoc = SourceLocation(); 2192 } 2193 } else { 2194 // Check for any unexpanded parameter packs. 2195 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2196 return true; 2197 2198 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2199 return true; 2200 } 2201 2202 // Check for direct and virtual base classes. 2203 const CXXBaseSpecifier *DirectBaseSpec = 0; 2204 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2205 if (!Dependent) { 2206 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2207 BaseType)) 2208 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2209 2210 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2211 VirtualBaseSpec); 2212 2213 // C++ [base.class.init]p2: 2214 // Unless the mem-initializer-id names a nonstatic data member of the 2215 // constructor's class or a direct or virtual base of that class, the 2216 // mem-initializer is ill-formed. 2217 if (!DirectBaseSpec && !VirtualBaseSpec) { 2218 // If the class has any dependent bases, then it's possible that 2219 // one of those types will resolve to the same type as 2220 // BaseType. Therefore, just treat this as a dependent base 2221 // class initialization. FIXME: Should we try to check the 2222 // initialization anyway? It seems odd. 2223 if (ClassDecl->hasAnyDependentBases()) 2224 Dependent = true; 2225 else 2226 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2227 << BaseType << Context.getTypeDeclType(ClassDecl) 2228 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 } 2230 } 2231 2232 if (Dependent) { 2233 // Can't check initialization for a base of dependent type or when 2234 // any of the arguments are type-dependent expressions. 2235 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2236 2237 DiscardCleanupsInEvaluationContext(); 2238 2239 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2240 /*IsVirtual=*/false, 2241 Args.getStartLoc(), BaseInit, 2242 Args.getEndLoc(), EllipsisLoc); 2243 } 2244 2245 // C++ [base.class.init]p2: 2246 // If a mem-initializer-id is ambiguous because it designates both 2247 // a direct non-virtual base class and an inherited virtual base 2248 // class, the mem-initializer is ill-formed. 2249 if (DirectBaseSpec && VirtualBaseSpec) 2250 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 CXXBaseSpecifier *BaseSpec 2254 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2255 if (!BaseSpec) 2256 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2257 2258 // Initialize the base. 2259 InitializedEntity BaseEntity = 2260 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2261 InitializationKind Kind = 2262 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2263 Args.getEndLoc()); 2264 2265 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2266 if (BaseInit.isInvalid()) 2267 return true; 2268 2269 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2270 2271 // C++0x [class.base.init]p7: 2272 // The initialization of each base and member constitutes a 2273 // full-expression. 2274 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2275 if (BaseInit.isInvalid()) 2276 return true; 2277 2278 // If we are in a dependent context, template instantiation will 2279 // perform this type-checking again. Just save the arguments that we 2280 // received in a ParenListExpr. 2281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2282 // of the information that we have about the base 2283 // initializer. However, deconstructing the ASTs is a dicey process, 2284 // and this approach is far more likely to get the corner cases right. 2285 if (CurContext->isDependentContext()) 2286 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2287 2288 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2289 BaseSpec->isVirtual(), 2290 Args.getStartLoc(), 2291 BaseInit.takeAs<Expr>(), 2292 Args.getEndLoc(), EllipsisLoc); 2293} 2294 2295// Create a static_cast\<T&&>(expr). 2296static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2297 QualType ExprType = E->getType(); 2298 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2299 SourceLocation ExprLoc = E->getLocStart(); 2300 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2301 TargetType, ExprLoc); 2302 2303 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2304 SourceRange(ExprLoc, ExprLoc), 2305 E->getSourceRange()).take(); 2306} 2307 2308/// ImplicitInitializerKind - How an implicit base or member initializer should 2309/// initialize its base or member. 2310enum ImplicitInitializerKind { 2311 IIK_Default, 2312 IIK_Copy, 2313 IIK_Move 2314}; 2315 2316static bool 2317BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2318 ImplicitInitializerKind ImplicitInitKind, 2319 CXXBaseSpecifier *BaseSpec, 2320 bool IsInheritedVirtualBase, 2321 CXXCtorInitializer *&CXXBaseInit) { 2322 InitializedEntity InitEntity 2323 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2324 IsInheritedVirtualBase); 2325 2326 ExprResult BaseInit; 2327 2328 switch (ImplicitInitKind) { 2329 case IIK_Default: { 2330 InitializationKind InitKind 2331 = InitializationKind::CreateDefault(Constructor->getLocation()); 2332 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2333 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2334 MultiExprArg(SemaRef, 0, 0)); 2335 break; 2336 } 2337 2338 case IIK_Move: 2339 case IIK_Copy: { 2340 bool Moving = ImplicitInitKind == IIK_Move; 2341 ParmVarDecl *Param = Constructor->getParamDecl(0); 2342 QualType ParamType = Param->getType().getNonReferenceType(); 2343 2344 Expr *CopyCtorArg = 2345 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2346 Constructor->getLocation(), ParamType, 2347 VK_LValue, 0); 2348 2349 // Cast to the base class to avoid ambiguities. 2350 QualType ArgTy = 2351 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2352 ParamType.getQualifiers()); 2353 2354 if (Moving) { 2355 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2356 } 2357 2358 CXXCastPath BasePath; 2359 BasePath.push_back(BaseSpec); 2360 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2361 CK_UncheckedDerivedToBase, 2362 Moving ? VK_XValue : VK_LValue, 2363 &BasePath).take(); 2364 2365 InitializationKind InitKind 2366 = InitializationKind::CreateDirect(Constructor->getLocation(), 2367 SourceLocation(), SourceLocation()); 2368 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2369 &CopyCtorArg, 1); 2370 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2371 MultiExprArg(&CopyCtorArg, 1)); 2372 break; 2373 } 2374 } 2375 2376 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2377 if (BaseInit.isInvalid()) 2378 return true; 2379 2380 CXXBaseInit = 2381 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2382 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2383 SourceLocation()), 2384 BaseSpec->isVirtual(), 2385 SourceLocation(), 2386 BaseInit.takeAs<Expr>(), 2387 SourceLocation(), 2388 SourceLocation()); 2389 2390 return false; 2391} 2392 2393static bool RefersToRValueRef(Expr *MemRef) { 2394 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2395 return Referenced->getType()->isRValueReferenceType(); 2396} 2397 2398static bool 2399BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 FieldDecl *Field, IndirectFieldDecl *Indirect, 2402 CXXCtorInitializer *&CXXMemberInit) { 2403 if (Field->isInvalidDecl()) 2404 return true; 2405 2406 SourceLocation Loc = Constructor->getLocation(); 2407 2408 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2409 bool Moving = ImplicitInitKind == IIK_Move; 2410 ParmVarDecl *Param = Constructor->getParamDecl(0); 2411 QualType ParamType = Param->getType().getNonReferenceType(); 2412 2413 // Suppress copying zero-width bitfields. 2414 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636}; 2637} 2638 2639/// \brief Determine whether the given indirect field declaration is somewhere 2640/// within an anonymous union. 2641static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2642 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2643 CEnd = F->chain_end(); 2644 C != CEnd; ++C) 2645 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2646 if (Record->isUnion()) 2647 return true; 2648 2649 return false; 2650} 2651 2652/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2653/// array type. 2654static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2655 if (T->isIncompleteArrayType()) 2656 return true; 2657 2658 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2659 if (!ArrayT->getSize()) 2660 return true; 2661 2662 T = ArrayT->getElementType(); 2663 } 2664 2665 return false; 2666} 2667 2668static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2669 FieldDecl *Field, 2670 IndirectFieldDecl *Indirect = 0) { 2671 2672 // Overwhelmingly common case: we have a direct initializer for this field. 2673 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2674 Info.AllToInit.push_back(Init); 2675 return false; 2676 } 2677 2678 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2679 // has a brace-or-equal-initializer, the entity is initialized as specified 2680 // in [dcl.init]. 2681 if (Field->hasInClassInitializer()) { 2682 CXXCtorInitializer *Init; 2683 if (Indirect) 2684 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2685 SourceLocation(), 2686 SourceLocation(), 0, 2687 SourceLocation()); 2688 else 2689 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2690 SourceLocation(), 2691 SourceLocation(), 0, 2692 SourceLocation()); 2693 Info.AllToInit.push_back(Init); 2694 return false; 2695 } 2696 2697 // Don't build an implicit initializer for union members if none was 2698 // explicitly specified. 2699 if (Field->getParent()->isUnion() || 2700 (Indirect && isWithinAnonymousUnion(Indirect))) 2701 return false; 2702 2703 // Don't initialize incomplete or zero-length arrays. 2704 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2705 return false; 2706 2707 // Don't try to build an implicit initializer if there were semantic 2708 // errors in any of the initializers (and therefore we might be 2709 // missing some that the user actually wrote). 2710 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2711 return false; 2712 2713 CXXCtorInitializer *Init = 0; 2714 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2715 Indirect, Init)) 2716 return true; 2717 2718 if (Init) 2719 Info.AllToInit.push_back(Init); 2720 2721 return false; 2722} 2723 2724bool 2725Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2726 CXXCtorInitializer *Initializer) { 2727 assert(Initializer->isDelegatingInitializer()); 2728 Constructor->setNumCtorInitializers(1); 2729 CXXCtorInitializer **initializer = 2730 new (Context) CXXCtorInitializer*[1]; 2731 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2732 Constructor->setCtorInitializers(initializer); 2733 2734 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2735 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2736 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2737 } 2738 2739 DelegatingCtorDecls.push_back(Constructor); 2740 2741 return false; 2742} 2743 2744bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2745 CXXCtorInitializer **Initializers, 2746 unsigned NumInitializers, 2747 bool AnyErrors) { 2748 if (Constructor->isDependentContext()) { 2749 // Just store the initializers as written, they will be checked during 2750 // instantiation. 2751 if (NumInitializers > 0) { 2752 Constructor->setNumCtorInitializers(NumInitializers); 2753 CXXCtorInitializer **baseOrMemberInitializers = 2754 new (Context) CXXCtorInitializer*[NumInitializers]; 2755 memcpy(baseOrMemberInitializers, Initializers, 2756 NumInitializers * sizeof(CXXCtorInitializer*)); 2757 Constructor->setCtorInitializers(baseOrMemberInitializers); 2758 } 2759 2760 return false; 2761 } 2762 2763 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2764 2765 // We need to build the initializer AST according to order of construction 2766 // and not what user specified in the Initializers list. 2767 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2768 if (!ClassDecl) 2769 return true; 2770 2771 bool HadError = false; 2772 2773 for (unsigned i = 0; i < NumInitializers; i++) { 2774 CXXCtorInitializer *Member = Initializers[i]; 2775 2776 if (Member->isBaseInitializer()) 2777 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2778 else 2779 Info.AllBaseFields[Member->getAnyMember()] = Member; 2780 } 2781 2782 // Keep track of the direct virtual bases. 2783 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2784 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2785 E = ClassDecl->bases_end(); I != E; ++I) { 2786 if (I->isVirtual()) 2787 DirectVBases.insert(I); 2788 } 2789 2790 // Push virtual bases before others. 2791 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2792 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2793 2794 if (CXXCtorInitializer *Value 2795 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2796 Info.AllToInit.push_back(Value); 2797 } else if (!AnyErrors) { 2798 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2799 CXXCtorInitializer *CXXBaseInit; 2800 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2801 VBase, IsInheritedVirtualBase, 2802 CXXBaseInit)) { 2803 HadError = true; 2804 continue; 2805 } 2806 2807 Info.AllToInit.push_back(CXXBaseInit); 2808 } 2809 } 2810 2811 // Non-virtual bases. 2812 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2813 E = ClassDecl->bases_end(); Base != E; ++Base) { 2814 // Virtuals are in the virtual base list and already constructed. 2815 if (Base->isVirtual()) 2816 continue; 2817 2818 if (CXXCtorInitializer *Value 2819 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2820 Info.AllToInit.push_back(Value); 2821 } else if (!AnyErrors) { 2822 CXXCtorInitializer *CXXBaseInit; 2823 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2824 Base, /*IsInheritedVirtualBase=*/false, 2825 CXXBaseInit)) { 2826 HadError = true; 2827 continue; 2828 } 2829 2830 Info.AllToInit.push_back(CXXBaseInit); 2831 } 2832 } 2833 2834 // Fields. 2835 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2836 MemEnd = ClassDecl->decls_end(); 2837 Mem != MemEnd; ++Mem) { 2838 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2839 // C++ [class.bit]p2: 2840 // A declaration for a bit-field that omits the identifier declares an 2841 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2842 // initialized. 2843 if (F->isUnnamedBitfield()) 2844 continue; 2845 2846 // If we're not generating the implicit copy/move constructor, then we'll 2847 // handle anonymous struct/union fields based on their individual 2848 // indirect fields. 2849 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2850 continue; 2851 2852 if (CollectFieldInitializer(*this, Info, F)) 2853 HadError = true; 2854 continue; 2855 } 2856 2857 // Beyond this point, we only consider default initialization. 2858 if (Info.IIK != IIK_Default) 2859 continue; 2860 2861 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2862 if (F->getType()->isIncompleteArrayType()) { 2863 assert(ClassDecl->hasFlexibleArrayMember() && 2864 "Incomplete array type is not valid"); 2865 continue; 2866 } 2867 2868 // Initialize each field of an anonymous struct individually. 2869 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2870 HadError = true; 2871 2872 continue; 2873 } 2874 } 2875 2876 NumInitializers = Info.AllToInit.size(); 2877 if (NumInitializers > 0) { 2878 Constructor->setNumCtorInitializers(NumInitializers); 2879 CXXCtorInitializer **baseOrMemberInitializers = 2880 new (Context) CXXCtorInitializer*[NumInitializers]; 2881 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2882 NumInitializers * sizeof(CXXCtorInitializer*)); 2883 Constructor->setCtorInitializers(baseOrMemberInitializers); 2884 2885 // Constructors implicitly reference the base and member 2886 // destructors. 2887 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2888 Constructor->getParent()); 2889 } 2890 2891 return HadError; 2892} 2893 2894static void *GetKeyForTopLevelField(FieldDecl *Field) { 2895 // For anonymous unions, use the class declaration as the key. 2896 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2897 if (RT->getDecl()->isAnonymousStructOrUnion()) 2898 return static_cast<void *>(RT->getDecl()); 2899 } 2900 return static_cast<void *>(Field); 2901} 2902 2903static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2904 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2905} 2906 2907static void *GetKeyForMember(ASTContext &Context, 2908 CXXCtorInitializer *Member) { 2909 if (!Member->isAnyMemberInitializer()) 2910 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2911 2912 // For fields injected into the class via declaration of an anonymous union, 2913 // use its anonymous union class declaration as the unique key. 2914 FieldDecl *Field = Member->getAnyMember(); 2915 2916 // If the field is a member of an anonymous struct or union, our key 2917 // is the anonymous record decl that's a direct child of the class. 2918 RecordDecl *RD = Field->getParent(); 2919 if (RD->isAnonymousStructOrUnion()) { 2920 while (true) { 2921 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2922 if (Parent->isAnonymousStructOrUnion()) 2923 RD = Parent; 2924 else 2925 break; 2926 } 2927 2928 return static_cast<void *>(RD); 2929 } 2930 2931 return static_cast<void *>(Field); 2932} 2933 2934static void 2935DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2936 const CXXConstructorDecl *Constructor, 2937 CXXCtorInitializer **Inits, 2938 unsigned NumInits) { 2939 if (Constructor->getDeclContext()->isDependentContext()) 2940 return; 2941 2942 // Don't check initializers order unless the warning is enabled at the 2943 // location of at least one initializer. 2944 bool ShouldCheckOrder = false; 2945 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2946 CXXCtorInitializer *Init = Inits[InitIndex]; 2947 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2948 Init->getSourceLocation()) 2949 != DiagnosticsEngine::Ignored) { 2950 ShouldCheckOrder = true; 2951 break; 2952 } 2953 } 2954 if (!ShouldCheckOrder) 2955 return; 2956 2957 // Build the list of bases and members in the order that they'll 2958 // actually be initialized. The explicit initializers should be in 2959 // this same order but may be missing things. 2960 SmallVector<const void*, 32> IdealInitKeys; 2961 2962 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2963 2964 // 1. Virtual bases. 2965 for (CXXRecordDecl::base_class_const_iterator VBase = 2966 ClassDecl->vbases_begin(), 2967 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2968 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2969 2970 // 2. Non-virtual bases. 2971 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2972 E = ClassDecl->bases_end(); Base != E; ++Base) { 2973 if (Base->isVirtual()) 2974 continue; 2975 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2976 } 2977 2978 // 3. Direct fields. 2979 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2980 E = ClassDecl->field_end(); Field != E; ++Field) { 2981 if (Field->isUnnamedBitfield()) 2982 continue; 2983 2984 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2985 } 2986 2987 unsigned NumIdealInits = IdealInitKeys.size(); 2988 unsigned IdealIndex = 0; 2989 2990 CXXCtorInitializer *PrevInit = 0; 2991 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2992 CXXCtorInitializer *Init = Inits[InitIndex]; 2993 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2994 2995 // Scan forward to try to find this initializer in the idealized 2996 // initializers list. 2997 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2998 if (InitKey == IdealInitKeys[IdealIndex]) 2999 break; 3000 3001 // If we didn't find this initializer, it must be because we 3002 // scanned past it on a previous iteration. That can only 3003 // happen if we're out of order; emit a warning. 3004 if (IdealIndex == NumIdealInits && PrevInit) { 3005 Sema::SemaDiagnosticBuilder D = 3006 SemaRef.Diag(PrevInit->getSourceLocation(), 3007 diag::warn_initializer_out_of_order); 3008 3009 if (PrevInit->isAnyMemberInitializer()) 3010 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3011 else 3012 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3013 3014 if (Init->isAnyMemberInitializer()) 3015 D << 0 << Init->getAnyMember()->getDeclName(); 3016 else 3017 D << 1 << Init->getTypeSourceInfo()->getType(); 3018 3019 // Move back to the initializer's location in the ideal list. 3020 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3021 if (InitKey == IdealInitKeys[IdealIndex]) 3022 break; 3023 3024 assert(IdealIndex != NumIdealInits && 3025 "initializer not found in initializer list"); 3026 } 3027 3028 PrevInit = Init; 3029 } 3030} 3031 3032namespace { 3033bool CheckRedundantInit(Sema &S, 3034 CXXCtorInitializer *Init, 3035 CXXCtorInitializer *&PrevInit) { 3036 if (!PrevInit) { 3037 PrevInit = Init; 3038 return false; 3039 } 3040 3041 if (FieldDecl *Field = Init->getMember()) 3042 S.Diag(Init->getSourceLocation(), 3043 diag::err_multiple_mem_initialization) 3044 << Field->getDeclName() 3045 << Init->getSourceRange(); 3046 else { 3047 const Type *BaseClass = Init->getBaseClass(); 3048 assert(BaseClass && "neither field nor base"); 3049 S.Diag(Init->getSourceLocation(), 3050 diag::err_multiple_base_initialization) 3051 << QualType(BaseClass, 0) 3052 << Init->getSourceRange(); 3053 } 3054 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3055 << 0 << PrevInit->getSourceRange(); 3056 3057 return true; 3058} 3059 3060typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3061typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3062 3063bool CheckRedundantUnionInit(Sema &S, 3064 CXXCtorInitializer *Init, 3065 RedundantUnionMap &Unions) { 3066 FieldDecl *Field = Init->getAnyMember(); 3067 RecordDecl *Parent = Field->getParent(); 3068 if (!Parent->isAnonymousStructOrUnion()) 3069 return false; 3070 3071 NamedDecl *Child = Field; 3072 do { 3073 if (Parent->isUnion()) { 3074 UnionEntry &En = Unions[Parent]; 3075 if (En.first && En.first != Child) { 3076 S.Diag(Init->getSourceLocation(), 3077 diag::err_multiple_mem_union_initialization) 3078 << Field->getDeclName() 3079 << Init->getSourceRange(); 3080 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3081 << 0 << En.second->getSourceRange(); 3082 return true; 3083 } else if (!En.first) { 3084 En.first = Child; 3085 En.second = Init; 3086 } 3087 } 3088 3089 Child = Parent; 3090 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3091 } while (Parent->isAnonymousStructOrUnion()); 3092 3093 return false; 3094} 3095} 3096 3097/// ActOnMemInitializers - Handle the member initializers for a constructor. 3098void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3099 SourceLocation ColonLoc, 3100 CXXCtorInitializer **meminits, 3101 unsigned NumMemInits, 3102 bool AnyErrors) { 3103 if (!ConstructorDecl) 3104 return; 3105 3106 AdjustDeclIfTemplate(ConstructorDecl); 3107 3108 CXXConstructorDecl *Constructor 3109 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3110 3111 if (!Constructor) { 3112 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3113 return; 3114 } 3115 3116 CXXCtorInitializer **MemInits = 3117 reinterpret_cast<CXXCtorInitializer **>(meminits); 3118 3119 // Mapping for the duplicate initializers check. 3120 // For member initializers, this is keyed with a FieldDecl*. 3121 // For base initializers, this is keyed with a Type*. 3122 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3123 3124 // Mapping for the inconsistent anonymous-union initializers check. 3125 RedundantUnionMap MemberUnions; 3126 3127 bool HadError = false; 3128 for (unsigned i = 0; i < NumMemInits; i++) { 3129 CXXCtorInitializer *Init = MemInits[i]; 3130 3131 // Set the source order index. 3132 Init->setSourceOrder(i); 3133 3134 if (Init->isAnyMemberInitializer()) { 3135 FieldDecl *Field = Init->getAnyMember(); 3136 if (CheckRedundantInit(*this, Init, Members[Field]) || 3137 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3138 HadError = true; 3139 } else if (Init->isBaseInitializer()) { 3140 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3141 if (CheckRedundantInit(*this, Init, Members[Key])) 3142 HadError = true; 3143 } else { 3144 assert(Init->isDelegatingInitializer()); 3145 // This must be the only initializer 3146 if (i != 0 || NumMemInits > 1) { 3147 Diag(MemInits[0]->getSourceLocation(), 3148 diag::err_delegating_initializer_alone) 3149 << MemInits[0]->getSourceRange(); 3150 HadError = true; 3151 // We will treat this as being the only initializer. 3152 } 3153 SetDelegatingInitializer(Constructor, MemInits[i]); 3154 // Return immediately as the initializer is set. 3155 return; 3156 } 3157 } 3158 3159 if (HadError) 3160 return; 3161 3162 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3163 3164 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3165} 3166 3167void 3168Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3169 CXXRecordDecl *ClassDecl) { 3170 // Ignore dependent contexts. Also ignore unions, since their members never 3171 // have destructors implicitly called. 3172 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3173 return; 3174 3175 // FIXME: all the access-control diagnostics are positioned on the 3176 // field/base declaration. That's probably good; that said, the 3177 // user might reasonably want to know why the destructor is being 3178 // emitted, and we currently don't say. 3179 3180 // Non-static data members. 3181 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3182 E = ClassDecl->field_end(); I != E; ++I) { 3183 FieldDecl *Field = *I; 3184 if (Field->isInvalidDecl()) 3185 continue; 3186 3187 // Don't destroy incomplete or zero-length arrays. 3188 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3189 continue; 3190 3191 QualType FieldType = Context.getBaseElementType(Field->getType()); 3192 3193 const RecordType* RT = FieldType->getAs<RecordType>(); 3194 if (!RT) 3195 continue; 3196 3197 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3198 if (FieldClassDecl->isInvalidDecl()) 3199 continue; 3200 if (FieldClassDecl->hasTrivialDestructor()) 3201 continue; 3202 3203 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3204 assert(Dtor && "No dtor found for FieldClassDecl!"); 3205 CheckDestructorAccess(Field->getLocation(), Dtor, 3206 PDiag(diag::err_access_dtor_field) 3207 << Field->getDeclName() 3208 << FieldType); 3209 3210 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3211 } 3212 3213 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3214 3215 // Bases. 3216 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3217 E = ClassDecl->bases_end(); Base != E; ++Base) { 3218 // Bases are always records in a well-formed non-dependent class. 3219 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3220 3221 // Remember direct virtual bases. 3222 if (Base->isVirtual()) 3223 DirectVirtualBases.insert(RT); 3224 3225 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3226 // If our base class is invalid, we probably can't get its dtor anyway. 3227 if (BaseClassDecl->isInvalidDecl()) 3228 continue; 3229 // Ignore trivial destructors. 3230 if (BaseClassDecl->hasTrivialDestructor()) 3231 continue; 3232 3233 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3234 assert(Dtor && "No dtor found for BaseClassDecl!"); 3235 3236 // FIXME: caret should be on the start of the class name 3237 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3238 PDiag(diag::err_access_dtor_base) 3239 << Base->getType() 3240 << Base->getSourceRange()); 3241 3242 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3243 } 3244 3245 // Virtual bases. 3246 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3247 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3248 3249 // Bases are always records in a well-formed non-dependent class. 3250 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3251 3252 // Ignore direct virtual bases. 3253 if (DirectVirtualBases.count(RT)) 3254 continue; 3255 3256 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3257 // If our base class is invalid, we probably can't get its dtor anyway. 3258 if (BaseClassDecl->isInvalidDecl()) 3259 continue; 3260 // Ignore trivial destructors. 3261 if (BaseClassDecl->hasTrivialDestructor()) 3262 continue; 3263 3264 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3265 assert(Dtor && "No dtor found for BaseClassDecl!"); 3266 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3267 PDiag(diag::err_access_dtor_vbase) 3268 << VBase->getType()); 3269 3270 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3271 } 3272} 3273 3274void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3275 if (!CDtorDecl) 3276 return; 3277 3278 if (CXXConstructorDecl *Constructor 3279 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3280 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3281} 3282 3283bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3284 unsigned DiagID, AbstractDiagSelID SelID) { 3285 if (SelID == -1) 3286 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3287 else 3288 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3289} 3290 3291bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3292 const PartialDiagnostic &PD) { 3293 if (!getLangOptions().CPlusPlus) 3294 return false; 3295 3296 if (const ArrayType *AT = Context.getAsArrayType(T)) 3297 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3298 3299 if (const PointerType *PT = T->getAs<PointerType>()) { 3300 // Find the innermost pointer type. 3301 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3302 PT = T; 3303 3304 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3305 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3306 } 3307 3308 const RecordType *RT = T->getAs<RecordType>(); 3309 if (!RT) 3310 return false; 3311 3312 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3313 3314 // We can't answer whether something is abstract until it has a 3315 // definition. If it's currently being defined, we'll walk back 3316 // over all the declarations when we have a full definition. 3317 const CXXRecordDecl *Def = RD->getDefinition(); 3318 if (!Def || Def->isBeingDefined()) 3319 return false; 3320 3321 if (!RD->isAbstract()) 3322 return false; 3323 3324 Diag(Loc, PD) << RD->getDeclName(); 3325 DiagnoseAbstractType(RD); 3326 3327 return true; 3328} 3329 3330void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3331 // Check if we've already emitted the list of pure virtual functions 3332 // for this class. 3333 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3334 return; 3335 3336 CXXFinalOverriderMap FinalOverriders; 3337 RD->getFinalOverriders(FinalOverriders); 3338 3339 // Keep a set of seen pure methods so we won't diagnose the same method 3340 // more than once. 3341 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3342 3343 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3344 MEnd = FinalOverriders.end(); 3345 M != MEnd; 3346 ++M) { 3347 for (OverridingMethods::iterator SO = M->second.begin(), 3348 SOEnd = M->second.end(); 3349 SO != SOEnd; ++SO) { 3350 // C++ [class.abstract]p4: 3351 // A class is abstract if it contains or inherits at least one 3352 // pure virtual function for which the final overrider is pure 3353 // virtual. 3354 3355 // 3356 if (SO->second.size() != 1) 3357 continue; 3358 3359 if (!SO->second.front().Method->isPure()) 3360 continue; 3361 3362 if (!SeenPureMethods.insert(SO->second.front().Method)) 3363 continue; 3364 3365 Diag(SO->second.front().Method->getLocation(), 3366 diag::note_pure_virtual_function) 3367 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3368 } 3369 } 3370 3371 if (!PureVirtualClassDiagSet) 3372 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3373 PureVirtualClassDiagSet->insert(RD); 3374} 3375 3376namespace { 3377struct AbstractUsageInfo { 3378 Sema &S; 3379 CXXRecordDecl *Record; 3380 CanQualType AbstractType; 3381 bool Invalid; 3382 3383 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3384 : S(S), Record(Record), 3385 AbstractType(S.Context.getCanonicalType( 3386 S.Context.getTypeDeclType(Record))), 3387 Invalid(false) {} 3388 3389 void DiagnoseAbstractType() { 3390 if (Invalid) return; 3391 S.DiagnoseAbstractType(Record); 3392 Invalid = true; 3393 } 3394 3395 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3396}; 3397 3398struct CheckAbstractUsage { 3399 AbstractUsageInfo &Info; 3400 const NamedDecl *Ctx; 3401 3402 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3403 : Info(Info), Ctx(Ctx) {} 3404 3405 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3406 switch (TL.getTypeLocClass()) { 3407#define ABSTRACT_TYPELOC(CLASS, PARENT) 3408#define TYPELOC(CLASS, PARENT) \ 3409 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3410#include "clang/AST/TypeLocNodes.def" 3411 } 3412 } 3413 3414 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3415 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3416 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3417 if (!TL.getArg(I)) 3418 continue; 3419 3420 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3421 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3422 } 3423 } 3424 3425 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3426 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3427 } 3428 3429 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3430 // Visit the type parameters from a permissive context. 3431 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3432 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3433 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3434 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3435 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3436 // TODO: other template argument types? 3437 } 3438 } 3439 3440 // Visit pointee types from a permissive context. 3441#define CheckPolymorphic(Type) \ 3442 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3443 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3444 } 3445 CheckPolymorphic(PointerTypeLoc) 3446 CheckPolymorphic(ReferenceTypeLoc) 3447 CheckPolymorphic(MemberPointerTypeLoc) 3448 CheckPolymorphic(BlockPointerTypeLoc) 3449 CheckPolymorphic(AtomicTypeLoc) 3450 3451 /// Handle all the types we haven't given a more specific 3452 /// implementation for above. 3453 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3454 // Every other kind of type that we haven't called out already 3455 // that has an inner type is either (1) sugar or (2) contains that 3456 // inner type in some way as a subobject. 3457 if (TypeLoc Next = TL.getNextTypeLoc()) 3458 return Visit(Next, Sel); 3459 3460 // If there's no inner type and we're in a permissive context, 3461 // don't diagnose. 3462 if (Sel == Sema::AbstractNone) return; 3463 3464 // Check whether the type matches the abstract type. 3465 QualType T = TL.getType(); 3466 if (T->isArrayType()) { 3467 Sel = Sema::AbstractArrayType; 3468 T = Info.S.Context.getBaseElementType(T); 3469 } 3470 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3471 if (CT != Info.AbstractType) return; 3472 3473 // It matched; do some magic. 3474 if (Sel == Sema::AbstractArrayType) { 3475 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3476 << T << TL.getSourceRange(); 3477 } else { 3478 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3479 << Sel << T << TL.getSourceRange(); 3480 } 3481 Info.DiagnoseAbstractType(); 3482 } 3483}; 3484 3485void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3486 Sema::AbstractDiagSelID Sel) { 3487 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3488} 3489 3490} 3491 3492/// Check for invalid uses of an abstract type in a method declaration. 3493static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3494 CXXMethodDecl *MD) { 3495 // No need to do the check on definitions, which require that 3496 // the return/param types be complete. 3497 if (MD->doesThisDeclarationHaveABody()) 3498 return; 3499 3500 // For safety's sake, just ignore it if we don't have type source 3501 // information. This should never happen for non-implicit methods, 3502 // but... 3503 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3504 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3505} 3506 3507/// Check for invalid uses of an abstract type within a class definition. 3508static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3509 CXXRecordDecl *RD) { 3510 for (CXXRecordDecl::decl_iterator 3511 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3512 Decl *D = *I; 3513 if (D->isImplicit()) continue; 3514 3515 // Methods and method templates. 3516 if (isa<CXXMethodDecl>(D)) { 3517 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3518 } else if (isa<FunctionTemplateDecl>(D)) { 3519 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3520 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3521 3522 // Fields and static variables. 3523 } else if (isa<FieldDecl>(D)) { 3524 FieldDecl *FD = cast<FieldDecl>(D); 3525 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3526 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3527 } else if (isa<VarDecl>(D)) { 3528 VarDecl *VD = cast<VarDecl>(D); 3529 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3530 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3531 3532 // Nested classes and class templates. 3533 } else if (isa<CXXRecordDecl>(D)) { 3534 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3535 } else if (isa<ClassTemplateDecl>(D)) { 3536 CheckAbstractClassUsage(Info, 3537 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3538 } 3539 } 3540} 3541 3542/// \brief Perform semantic checks on a class definition that has been 3543/// completing, introducing implicitly-declared members, checking for 3544/// abstract types, etc. 3545void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3546 if (!Record) 3547 return; 3548 3549 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3550 AbstractUsageInfo Info(*this, Record); 3551 CheckAbstractClassUsage(Info, Record); 3552 } 3553 3554 // If this is not an aggregate type and has no user-declared constructor, 3555 // complain about any non-static data members of reference or const scalar 3556 // type, since they will never get initializers. 3557 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3558 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3559 bool Complained = false; 3560 for (RecordDecl::field_iterator F = Record->field_begin(), 3561 FEnd = Record->field_end(); 3562 F != FEnd; ++F) { 3563 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3564 continue; 3565 3566 if (F->getType()->isReferenceType() || 3567 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3568 if (!Complained) { 3569 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3570 << Record->getTagKind() << Record; 3571 Complained = true; 3572 } 3573 3574 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3575 << F->getType()->isReferenceType() 3576 << F->getDeclName(); 3577 } 3578 } 3579 } 3580 3581 if (Record->isDynamicClass() && !Record->isDependentType()) 3582 DynamicClasses.push_back(Record); 3583 3584 if (Record->getIdentifier()) { 3585 // C++ [class.mem]p13: 3586 // If T is the name of a class, then each of the following shall have a 3587 // name different from T: 3588 // - every member of every anonymous union that is a member of class T. 3589 // 3590 // C++ [class.mem]p14: 3591 // In addition, if class T has a user-declared constructor (12.1), every 3592 // non-static data member of class T shall have a name different from T. 3593 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3594 R.first != R.second; ++R.first) { 3595 NamedDecl *D = *R.first; 3596 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3597 isa<IndirectFieldDecl>(D)) { 3598 Diag(D->getLocation(), diag::err_member_name_of_class) 3599 << D->getDeclName(); 3600 break; 3601 } 3602 } 3603 } 3604 3605 // Warn if the class has virtual methods but non-virtual public destructor. 3606 if (Record->isPolymorphic() && !Record->isDependentType()) { 3607 CXXDestructorDecl *dtor = Record->getDestructor(); 3608 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3609 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3610 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3611 } 3612 3613 // See if a method overloads virtual methods in a base 3614 /// class without overriding any. 3615 if (!Record->isDependentType()) { 3616 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3617 MEnd = Record->method_end(); 3618 M != MEnd; ++M) { 3619 if (!(*M)->isStatic()) 3620 DiagnoseHiddenVirtualMethods(Record, *M); 3621 } 3622 } 3623 3624 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3625 // function that is not a constructor declares that member function to be 3626 // const. [...] The class of which that function is a member shall be 3627 // a literal type. 3628 // 3629 // It's fine to diagnose constructors here too: such constructors cannot 3630 // produce a constant expression, so are ill-formed (no diagnostic required). 3631 // 3632 // If the class has virtual bases, any constexpr members will already have 3633 // been diagnosed by the checks performed on the member declaration, so 3634 // suppress this (less useful) diagnostic. 3635 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3636 !Record->isLiteral() && !Record->getNumVBases()) { 3637 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3638 MEnd = Record->method_end(); 3639 M != MEnd; ++M) { 3640 if ((*M)->isConstexpr()) { 3641 switch (Record->getTemplateSpecializationKind()) { 3642 case TSK_ImplicitInstantiation: 3643 case TSK_ExplicitInstantiationDeclaration: 3644 case TSK_ExplicitInstantiationDefinition: 3645 // If a template instantiates to a non-literal type, but its members 3646 // instantiate to constexpr functions, the template is technically 3647 // ill-formed, but we allow it for sanity. Such members are treated as 3648 // non-constexpr. 3649 (*M)->setConstexpr(false); 3650 continue; 3651 3652 case TSK_Undeclared: 3653 case TSK_ExplicitSpecialization: 3654 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3655 PDiag(diag::err_constexpr_method_non_literal)); 3656 break; 3657 } 3658 3659 // Only produce one error per class. 3660 break; 3661 } 3662 } 3663 } 3664 3665 // Declare inherited constructors. We do this eagerly here because: 3666 // - The standard requires an eager diagnostic for conflicting inherited 3667 // constructors from different classes. 3668 // - The lazy declaration of the other implicit constructors is so as to not 3669 // waste space and performance on classes that are not meant to be 3670 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3671 // have inherited constructors. 3672 DeclareInheritedConstructors(Record); 3673 3674 if (!Record->isDependentType()) 3675 CheckExplicitlyDefaultedMethods(Record); 3676} 3677 3678void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3679 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3680 ME = Record->method_end(); 3681 MI != ME; ++MI) { 3682 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3683 switch (getSpecialMember(*MI)) { 3684 case CXXDefaultConstructor: 3685 CheckExplicitlyDefaultedDefaultConstructor( 3686 cast<CXXConstructorDecl>(*MI)); 3687 break; 3688 3689 case CXXDestructor: 3690 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3691 break; 3692 3693 case CXXCopyConstructor: 3694 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3695 break; 3696 3697 case CXXCopyAssignment: 3698 CheckExplicitlyDefaultedCopyAssignment(*MI); 3699 break; 3700 3701 case CXXMoveConstructor: 3702 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3703 break; 3704 3705 case CXXMoveAssignment: 3706 CheckExplicitlyDefaultedMoveAssignment(*MI); 3707 break; 3708 3709 case CXXInvalid: 3710 llvm_unreachable("non-special member explicitly defaulted!"); 3711 } 3712 } 3713 } 3714 3715} 3716 3717void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3718 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3719 3720 // Whether this was the first-declared instance of the constructor. 3721 // This affects whether we implicitly add an exception spec (and, eventually, 3722 // constexpr). It is also ill-formed to explicitly default a constructor such 3723 // that it would be deleted. (C++0x [decl.fct.def.default]) 3724 bool First = CD == CD->getCanonicalDecl(); 3725 3726 bool HadError = false; 3727 if (CD->getNumParams() != 0) { 3728 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3729 << CD->getSourceRange(); 3730 HadError = true; 3731 } 3732 3733 ImplicitExceptionSpecification Spec 3734 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3735 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3736 if (EPI.ExceptionSpecType == EST_Delayed) { 3737 // Exception specification depends on some deferred part of the class. We'll 3738 // try again when the class's definition has been fully processed. 3739 return; 3740 } 3741 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3742 *ExceptionType = Context.getFunctionType( 3743 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3744 3745 if (CtorType->hasExceptionSpec()) { 3746 if (CheckEquivalentExceptionSpec( 3747 PDiag(diag::err_incorrect_defaulted_exception_spec) 3748 << CXXDefaultConstructor, 3749 PDiag(), 3750 ExceptionType, SourceLocation(), 3751 CtorType, CD->getLocation())) { 3752 HadError = true; 3753 } 3754 } else if (First) { 3755 // We set the declaration to have the computed exception spec here. 3756 // We know there are no parameters. 3757 EPI.ExtInfo = CtorType->getExtInfo(); 3758 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3759 } 3760 3761 if (HadError) { 3762 CD->setInvalidDecl(); 3763 return; 3764 } 3765 3766 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3767 if (First) { 3768 CD->setDeletedAsWritten(); 3769 } else { 3770 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3771 << CXXDefaultConstructor; 3772 CD->setInvalidDecl(); 3773 } 3774 } 3775} 3776 3777void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3778 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3779 3780 // Whether this was the first-declared instance of the constructor. 3781 bool First = CD == CD->getCanonicalDecl(); 3782 3783 bool HadError = false; 3784 if (CD->getNumParams() != 1) { 3785 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3786 << CD->getSourceRange(); 3787 HadError = true; 3788 } 3789 3790 ImplicitExceptionSpecification Spec(Context); 3791 bool Const; 3792 llvm::tie(Spec, Const) = 3793 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3794 3795 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3796 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3797 *ExceptionType = Context.getFunctionType( 3798 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3799 3800 // Check for parameter type matching. 3801 // This is a copy ctor so we know it's a cv-qualified reference to T. 3802 QualType ArgType = CtorType->getArgType(0); 3803 if (ArgType->getPointeeType().isVolatileQualified()) { 3804 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3805 HadError = true; 3806 } 3807 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3808 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3809 HadError = true; 3810 } 3811 3812 if (CtorType->hasExceptionSpec()) { 3813 if (CheckEquivalentExceptionSpec( 3814 PDiag(diag::err_incorrect_defaulted_exception_spec) 3815 << CXXCopyConstructor, 3816 PDiag(), 3817 ExceptionType, SourceLocation(), 3818 CtorType, CD->getLocation())) { 3819 HadError = true; 3820 } 3821 } else if (First) { 3822 // We set the declaration to have the computed exception spec here. 3823 // We duplicate the one parameter type. 3824 EPI.ExtInfo = CtorType->getExtInfo(); 3825 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3826 } 3827 3828 if (HadError) { 3829 CD->setInvalidDecl(); 3830 return; 3831 } 3832 3833 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3834 if (First) { 3835 CD->setDeletedAsWritten(); 3836 } else { 3837 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3838 << CXXCopyConstructor; 3839 CD->setInvalidDecl(); 3840 } 3841 } 3842} 3843 3844void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3845 assert(MD->isExplicitlyDefaulted()); 3846 3847 // Whether this was the first-declared instance of the operator 3848 bool First = MD == MD->getCanonicalDecl(); 3849 3850 bool HadError = false; 3851 if (MD->getNumParams() != 1) { 3852 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3853 << MD->getSourceRange(); 3854 HadError = true; 3855 } 3856 3857 QualType ReturnType = 3858 MD->getType()->getAs<FunctionType>()->getResultType(); 3859 if (!ReturnType->isLValueReferenceType() || 3860 !Context.hasSameType( 3861 Context.getCanonicalType(ReturnType->getPointeeType()), 3862 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3863 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3864 HadError = true; 3865 } 3866 3867 ImplicitExceptionSpecification Spec(Context); 3868 bool Const; 3869 llvm::tie(Spec, Const) = 3870 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3871 3872 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3873 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3874 *ExceptionType = Context.getFunctionType( 3875 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3876 3877 QualType ArgType = OperType->getArgType(0); 3878 if (!ArgType->isLValueReferenceType()) { 3879 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3880 HadError = true; 3881 } else { 3882 if (ArgType->getPointeeType().isVolatileQualified()) { 3883 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3884 HadError = true; 3885 } 3886 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3887 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3888 HadError = true; 3889 } 3890 } 3891 3892 if (OperType->getTypeQuals()) { 3893 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3894 HadError = true; 3895 } 3896 3897 if (OperType->hasExceptionSpec()) { 3898 if (CheckEquivalentExceptionSpec( 3899 PDiag(diag::err_incorrect_defaulted_exception_spec) 3900 << CXXCopyAssignment, 3901 PDiag(), 3902 ExceptionType, SourceLocation(), 3903 OperType, MD->getLocation())) { 3904 HadError = true; 3905 } 3906 } else if (First) { 3907 // We set the declaration to have the computed exception spec here. 3908 // We duplicate the one parameter type. 3909 EPI.RefQualifier = OperType->getRefQualifier(); 3910 EPI.ExtInfo = OperType->getExtInfo(); 3911 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3912 } 3913 3914 if (HadError) { 3915 MD->setInvalidDecl(); 3916 return; 3917 } 3918 3919 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3920 if (First) { 3921 MD->setDeletedAsWritten(); 3922 } else { 3923 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3924 << CXXCopyAssignment; 3925 MD->setInvalidDecl(); 3926 } 3927 } 3928} 3929 3930void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3931 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3932 3933 // Whether this was the first-declared instance of the constructor. 3934 bool First = CD == CD->getCanonicalDecl(); 3935 3936 bool HadError = false; 3937 if (CD->getNumParams() != 1) { 3938 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3939 << CD->getSourceRange(); 3940 HadError = true; 3941 } 3942 3943 ImplicitExceptionSpecification Spec( 3944 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3945 3946 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3947 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3948 *ExceptionType = Context.getFunctionType( 3949 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3950 3951 // Check for parameter type matching. 3952 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3953 QualType ArgType = CtorType->getArgType(0); 3954 if (ArgType->getPointeeType().isVolatileQualified()) { 3955 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3956 HadError = true; 3957 } 3958 if (ArgType->getPointeeType().isConstQualified()) { 3959 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3960 HadError = true; 3961 } 3962 3963 if (CtorType->hasExceptionSpec()) { 3964 if (CheckEquivalentExceptionSpec( 3965 PDiag(diag::err_incorrect_defaulted_exception_spec) 3966 << CXXMoveConstructor, 3967 PDiag(), 3968 ExceptionType, SourceLocation(), 3969 CtorType, CD->getLocation())) { 3970 HadError = true; 3971 } 3972 } else if (First) { 3973 // We set the declaration to have the computed exception spec here. 3974 // We duplicate the one parameter type. 3975 EPI.ExtInfo = CtorType->getExtInfo(); 3976 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3977 } 3978 3979 if (HadError) { 3980 CD->setInvalidDecl(); 3981 return; 3982 } 3983 3984 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3985 if (First) { 3986 CD->setDeletedAsWritten(); 3987 } else { 3988 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3989 << CXXMoveConstructor; 3990 CD->setInvalidDecl(); 3991 } 3992 } 3993} 3994 3995void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3996 assert(MD->isExplicitlyDefaulted()); 3997 3998 // Whether this was the first-declared instance of the operator 3999 bool First = MD == MD->getCanonicalDecl(); 4000 4001 bool HadError = false; 4002 if (MD->getNumParams() != 1) { 4003 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4004 << MD->getSourceRange(); 4005 HadError = true; 4006 } 4007 4008 QualType ReturnType = 4009 MD->getType()->getAs<FunctionType>()->getResultType(); 4010 if (!ReturnType->isLValueReferenceType() || 4011 !Context.hasSameType( 4012 Context.getCanonicalType(ReturnType->getPointeeType()), 4013 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4014 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4015 HadError = true; 4016 } 4017 4018 ImplicitExceptionSpecification Spec( 4019 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4020 4021 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4022 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4023 *ExceptionType = Context.getFunctionType( 4024 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4025 4026 QualType ArgType = OperType->getArgType(0); 4027 if (!ArgType->isRValueReferenceType()) { 4028 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4029 HadError = true; 4030 } else { 4031 if (ArgType->getPointeeType().isVolatileQualified()) { 4032 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4033 HadError = true; 4034 } 4035 if (ArgType->getPointeeType().isConstQualified()) { 4036 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4037 HadError = true; 4038 } 4039 } 4040 4041 if (OperType->getTypeQuals()) { 4042 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4043 HadError = true; 4044 } 4045 4046 if (OperType->hasExceptionSpec()) { 4047 if (CheckEquivalentExceptionSpec( 4048 PDiag(diag::err_incorrect_defaulted_exception_spec) 4049 << CXXMoveAssignment, 4050 PDiag(), 4051 ExceptionType, SourceLocation(), 4052 OperType, MD->getLocation())) { 4053 HadError = true; 4054 } 4055 } else if (First) { 4056 // We set the declaration to have the computed exception spec here. 4057 // We duplicate the one parameter type. 4058 EPI.RefQualifier = OperType->getRefQualifier(); 4059 EPI.ExtInfo = OperType->getExtInfo(); 4060 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4061 } 4062 4063 if (HadError) { 4064 MD->setInvalidDecl(); 4065 return; 4066 } 4067 4068 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4069 if (First) { 4070 MD->setDeletedAsWritten(); 4071 } else { 4072 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4073 << CXXMoveAssignment; 4074 MD->setInvalidDecl(); 4075 } 4076 } 4077} 4078 4079void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4080 assert(DD->isExplicitlyDefaulted()); 4081 4082 // Whether this was the first-declared instance of the destructor. 4083 bool First = DD == DD->getCanonicalDecl(); 4084 4085 ImplicitExceptionSpecification Spec 4086 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4087 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4088 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4089 *ExceptionType = Context.getFunctionType( 4090 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4091 4092 if (DtorType->hasExceptionSpec()) { 4093 if (CheckEquivalentExceptionSpec( 4094 PDiag(diag::err_incorrect_defaulted_exception_spec) 4095 << CXXDestructor, 4096 PDiag(), 4097 ExceptionType, SourceLocation(), 4098 DtorType, DD->getLocation())) { 4099 DD->setInvalidDecl(); 4100 return; 4101 } 4102 } else if (First) { 4103 // We set the declaration to have the computed exception spec here. 4104 // There are no parameters. 4105 EPI.ExtInfo = DtorType->getExtInfo(); 4106 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4107 } 4108 4109 if (ShouldDeleteDestructor(DD)) { 4110 if (First) { 4111 DD->setDeletedAsWritten(); 4112 } else { 4113 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4114 << CXXDestructor; 4115 DD->setInvalidDecl(); 4116 } 4117 } 4118} 4119 4120/// This function implements the following C++0x paragraphs: 4121/// - [class.ctor]/5 4122/// - [class.copy]/11 4123bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4124 assert(!MD->isInvalidDecl()); 4125 CXXRecordDecl *RD = MD->getParent(); 4126 assert(!RD->isDependentType() && "do deletion after instantiation"); 4127 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4128 return false; 4129 4130 bool IsUnion = RD->isUnion(); 4131 bool IsConstructor = false; 4132 bool IsAssignment = false; 4133 bool IsMove = false; 4134 4135 bool ConstArg = false; 4136 4137 switch (CSM) { 4138 case CXXDefaultConstructor: 4139 IsConstructor = true; 4140 break; 4141 case CXXCopyConstructor: 4142 IsConstructor = true; 4143 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4144 break; 4145 case CXXMoveConstructor: 4146 IsConstructor = true; 4147 IsMove = true; 4148 break; 4149 default: 4150 llvm_unreachable("function only currently implemented for default ctors"); 4151 } 4152 4153 SourceLocation Loc = MD->getLocation(); 4154 4155 // Do access control from the special member function 4156 ContextRAII MethodContext(*this, MD); 4157 4158 bool AllConst = true; 4159 4160 // We do this because we should never actually use an anonymous 4161 // union's constructor. 4162 if (IsUnion && RD->isAnonymousStructOrUnion()) 4163 return false; 4164 4165 // FIXME: We should put some diagnostic logic right into this function. 4166 4167 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4168 BE = RD->bases_end(); 4169 BI != BE; ++BI) { 4170 // We'll handle this one later 4171 if (BI->isVirtual()) 4172 continue; 4173 4174 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4175 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4176 4177 // Unless we have an assignment operator, the base's destructor must 4178 // be accessible and not deleted. 4179 if (!IsAssignment) { 4180 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4181 if (BaseDtor->isDeleted()) 4182 return true; 4183 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4184 AR_accessible) 4185 return true; 4186 } 4187 4188 // Finding the corresponding member in the base should lead to a 4189 // unique, accessible, non-deleted function. If we are doing 4190 // a destructor, we have already checked this case. 4191 if (CSM != CXXDestructor) { 4192 SpecialMemberOverloadResult *SMOR = 4193 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4194 false); 4195 if (!SMOR->hasSuccess()) 4196 return true; 4197 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4198 if (IsConstructor) { 4199 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4200 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4201 PDiag()) != AR_accessible) 4202 return true; 4203 4204 // For a move operation, the corresponding operation must actually 4205 // be a move operation (and not a copy selected by overload 4206 // resolution) unless we are working on a trivially copyable class. 4207 if (IsMove && !BaseCtor->isMoveConstructor() && 4208 !BaseDecl->isTriviallyCopyable()) 4209 return true; 4210 } 4211 } 4212 } 4213 4214 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4215 BE = RD->vbases_end(); 4216 BI != BE; ++BI) { 4217 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4218 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4219 4220 // Unless we have an assignment operator, the base's destructor must 4221 // be accessible and not deleted. 4222 if (!IsAssignment) { 4223 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4224 if (BaseDtor->isDeleted()) 4225 return true; 4226 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4227 AR_accessible) 4228 return true; 4229 } 4230 4231 // Finding the corresponding member in the base should lead to a 4232 // unique, accessible, non-deleted function. 4233 if (CSM != CXXDestructor) { 4234 SpecialMemberOverloadResult *SMOR = 4235 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4236 false); 4237 if (!SMOR->hasSuccess()) 4238 return true; 4239 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4240 if (IsConstructor) { 4241 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4242 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4243 PDiag()) != AR_accessible) 4244 return true; 4245 4246 // For a move operation, the corresponding operation must actually 4247 // be a move operation (and not a copy selected by overload 4248 // resolution) unless we are working on a trivially copyable class. 4249 if (IsMove && !BaseCtor->isMoveConstructor() && 4250 !BaseDecl->isTriviallyCopyable()) 4251 return true; 4252 } 4253 } 4254 } 4255 4256 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4257 FE = RD->field_end(); 4258 FI != FE; ++FI) { 4259 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4260 continue; 4261 4262 QualType FieldType = Context.getBaseElementType(FI->getType()); 4263 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4264 4265 // For a default constructor, all references must be initialized in-class 4266 // and, if a union, it must have a non-const member. 4267 if (CSM == CXXDefaultConstructor) { 4268 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4269 return true; 4270 4271 if (IsUnion && !FieldType.isConstQualified()) 4272 AllConst = false; 4273 // For a copy constructor, data members must not be of rvalue reference 4274 // type. 4275 } else if (CSM == CXXCopyConstructor) { 4276 if (FieldType->isRValueReferenceType()) 4277 return true; 4278 } 4279 4280 if (FieldRecord) { 4281 // For a default constructor, a const member must have a user-provided 4282 // default constructor or else be explicitly initialized. 4283 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4284 !FI->hasInClassInitializer() && 4285 !FieldRecord->hasUserProvidedDefaultConstructor()) 4286 return true; 4287 4288 // Some additional restrictions exist on the variant members. 4289 if (!IsUnion && FieldRecord->isUnion() && 4290 FieldRecord->isAnonymousStructOrUnion()) { 4291 // We're okay to reuse AllConst here since we only care about the 4292 // value otherwise if we're in a union. 4293 AllConst = true; 4294 4295 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4296 UE = FieldRecord->field_end(); 4297 UI != UE; ++UI) { 4298 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4299 CXXRecordDecl *UnionFieldRecord = 4300 UnionFieldType->getAsCXXRecordDecl(); 4301 4302 if (!UnionFieldType.isConstQualified()) 4303 AllConst = false; 4304 4305 if (UnionFieldRecord) { 4306 // FIXME: Checking for accessibility and validity of this 4307 // destructor is technically going beyond the 4308 // standard, but this is believed to be a defect. 4309 if (!IsAssignment) { 4310 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4311 if (FieldDtor->isDeleted()) 4312 return true; 4313 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4314 AR_accessible) 4315 return true; 4316 if (!FieldDtor->isTrivial()) 4317 return true; 4318 } 4319 4320 if (CSM != CXXDestructor) { 4321 SpecialMemberOverloadResult *SMOR = 4322 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4323 false, false, false); 4324 // FIXME: Checking for accessibility and validity of this 4325 // corresponding member is technically going beyond the 4326 // standard, but this is believed to be a defect. 4327 if (!SMOR->hasSuccess()) 4328 return true; 4329 4330 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4331 // A member of a union must have a trivial corresponding 4332 // constructor. 4333 if (!FieldMember->isTrivial()) 4334 return true; 4335 4336 if (IsConstructor) { 4337 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4338 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4339 PDiag()) != AR_accessible) 4340 return true; 4341 } 4342 } 4343 } 4344 } 4345 4346 // At least one member in each anonymous union must be non-const 4347 if (CSM == CXXDefaultConstructor && AllConst) 4348 return true; 4349 4350 // Don't try to initialize the anonymous union 4351 // This is technically non-conformant, but sanity demands it. 4352 continue; 4353 } 4354 4355 // Unless we're doing assignment, the field's destructor must be 4356 // accessible and not deleted. 4357 if (!IsAssignment) { 4358 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4359 if (FieldDtor->isDeleted()) 4360 return true; 4361 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4362 AR_accessible) 4363 return true; 4364 } 4365 4366 // Check that the corresponding member of the field is accessible, 4367 // unique, and non-deleted. We don't do this if it has an explicit 4368 // initialization when default-constructing. 4369 if (CSM != CXXDestructor && 4370 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4371 SpecialMemberOverloadResult *SMOR = 4372 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4373 false); 4374 if (!SMOR->hasSuccess()) 4375 return true; 4376 4377 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4378 if (IsConstructor) { 4379 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4380 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4381 PDiag()) != AR_accessible) 4382 return true; 4383 4384 // For a move operation, the corresponding operation must actually 4385 // be a move operation (and not a copy selected by overload 4386 // resolution) unless we are working on a trivially copyable class. 4387 if (IsMove && !FieldCtor->isMoveConstructor() && 4388 !FieldRecord->isTriviallyCopyable()) 4389 return true; 4390 } 4391 4392 // We need the corresponding member of a union to be trivial so that 4393 // we can safely copy them all simultaneously. 4394 // FIXME: Note that performing the check here (where we rely on the lack 4395 // of an in-class initializer) is technically ill-formed. However, this 4396 // seems most obviously to be a bug in the standard. 4397 if (IsUnion && !FieldMember->isTrivial()) 4398 return true; 4399 } 4400 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4401 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4402 // We can't initialize a const member of non-class type to any value. 4403 return true; 4404 } 4405 } 4406 4407 // We can't have all const members in a union when default-constructing, 4408 // or else they're all nonsensical garbage values that can't be changed. 4409 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4410 return true; 4411 4412 return false; 4413} 4414 4415bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4416 CXXRecordDecl *RD = MD->getParent(); 4417 assert(!RD->isDependentType() && "do deletion after instantiation"); 4418 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4419 return false; 4420 4421 SourceLocation Loc = MD->getLocation(); 4422 4423 // Do access control from the constructor 4424 ContextRAII MethodContext(*this, MD); 4425 4426 bool Union = RD->isUnion(); 4427 4428 unsigned ArgQuals = 4429 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4430 Qualifiers::Const : 0; 4431 4432 // We do this because we should never actually use an anonymous 4433 // union's constructor. 4434 if (Union && RD->isAnonymousStructOrUnion()) 4435 return false; 4436 4437 // FIXME: We should put some diagnostic logic right into this function. 4438 4439 // C++0x [class.copy]/20 4440 // A defaulted [copy] assignment operator for class X is defined as deleted 4441 // if X has: 4442 4443 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4444 BE = RD->bases_end(); 4445 BI != BE; ++BI) { 4446 // We'll handle this one later 4447 if (BI->isVirtual()) 4448 continue; 4449 4450 QualType BaseType = BI->getType(); 4451 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4452 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4453 4454 // -- a [direct base class] B that cannot be [copied] because overload 4455 // resolution, as applied to B's [copy] assignment operator, results in 4456 // an ambiguity or a function that is deleted or inaccessible from the 4457 // assignment operator 4458 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4459 0); 4460 if (!CopyOper || CopyOper->isDeleted()) 4461 return true; 4462 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4463 return true; 4464 } 4465 4466 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4467 BE = RD->vbases_end(); 4468 BI != BE; ++BI) { 4469 QualType BaseType = BI->getType(); 4470 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4471 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4472 4473 // -- a [virtual base class] B that cannot be [copied] because overload 4474 // resolution, as applied to B's [copy] assignment operator, results in 4475 // an ambiguity or a function that is deleted or inaccessible from the 4476 // assignment operator 4477 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4478 0); 4479 if (!CopyOper || CopyOper->isDeleted()) 4480 return true; 4481 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4482 return true; 4483 } 4484 4485 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4486 FE = RD->field_end(); 4487 FI != FE; ++FI) { 4488 if (FI->isUnnamedBitfield()) 4489 continue; 4490 4491 QualType FieldType = Context.getBaseElementType(FI->getType()); 4492 4493 // -- a non-static data member of reference type 4494 if (FieldType->isReferenceType()) 4495 return true; 4496 4497 // -- a non-static data member of const non-class type (or array thereof) 4498 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4499 return true; 4500 4501 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4502 4503 if (FieldRecord) { 4504 // This is an anonymous union 4505 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4506 // Anonymous unions inside unions do not variant members create 4507 if (!Union) { 4508 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4509 UE = FieldRecord->field_end(); 4510 UI != UE; ++UI) { 4511 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4512 CXXRecordDecl *UnionFieldRecord = 4513 UnionFieldType->getAsCXXRecordDecl(); 4514 4515 // -- a variant member with a non-trivial [copy] assignment operator 4516 // and X is a union-like class 4517 if (UnionFieldRecord && 4518 !UnionFieldRecord->hasTrivialCopyAssignment()) 4519 return true; 4520 } 4521 } 4522 4523 // Don't try to initalize an anonymous union 4524 continue; 4525 // -- a variant member with a non-trivial [copy] assignment operator 4526 // and X is a union-like class 4527 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4528 return true; 4529 } 4530 4531 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4532 false, 0); 4533 if (!CopyOper || CopyOper->isDeleted()) 4534 return true; 4535 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4536 return true; 4537 } 4538 } 4539 4540 return false; 4541} 4542 4543bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4544 CXXRecordDecl *RD = MD->getParent(); 4545 assert(!RD->isDependentType() && "do deletion after instantiation"); 4546 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4547 return false; 4548 4549 SourceLocation Loc = MD->getLocation(); 4550 4551 // Do access control from the constructor 4552 ContextRAII MethodContext(*this, MD); 4553 4554 bool Union = RD->isUnion(); 4555 4556 // We do this because we should never actually use an anonymous 4557 // union's constructor. 4558 if (Union && RD->isAnonymousStructOrUnion()) 4559 return false; 4560 4561 // C++0x [class.copy]/20 4562 // A defaulted [move] assignment operator for class X is defined as deleted 4563 // if X has: 4564 4565 // -- for the move constructor, [...] any direct or indirect virtual base 4566 // class. 4567 if (RD->getNumVBases() != 0) 4568 return true; 4569 4570 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4571 BE = RD->bases_end(); 4572 BI != BE; ++BI) { 4573 4574 QualType BaseType = BI->getType(); 4575 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4576 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4577 4578 // -- a [direct base class] B that cannot be [moved] because overload 4579 // resolution, as applied to B's [move] assignment operator, results in 4580 // an ambiguity or a function that is deleted or inaccessible from the 4581 // assignment operator 4582 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4583 if (!MoveOper || MoveOper->isDeleted()) 4584 return true; 4585 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4586 return true; 4587 4588 // -- for the move assignment operator, a [direct base class] with a type 4589 // that does not have a move assignment operator and is not trivially 4590 // copyable. 4591 if (!MoveOper->isMoveAssignmentOperator() && 4592 !BaseDecl->isTriviallyCopyable()) 4593 return true; 4594 } 4595 4596 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4597 FE = RD->field_end(); 4598 FI != FE; ++FI) { 4599 if (FI->isUnnamedBitfield()) 4600 continue; 4601 4602 QualType FieldType = Context.getBaseElementType(FI->getType()); 4603 4604 // -- a non-static data member of reference type 4605 if (FieldType->isReferenceType()) 4606 return true; 4607 4608 // -- a non-static data member of const non-class type (or array thereof) 4609 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4610 return true; 4611 4612 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4613 4614 if (FieldRecord) { 4615 // This is an anonymous union 4616 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4617 // Anonymous unions inside unions do not variant members create 4618 if (!Union) { 4619 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4620 UE = FieldRecord->field_end(); 4621 UI != UE; ++UI) { 4622 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4623 CXXRecordDecl *UnionFieldRecord = 4624 UnionFieldType->getAsCXXRecordDecl(); 4625 4626 // -- a variant member with a non-trivial [move] assignment operator 4627 // and X is a union-like class 4628 if (UnionFieldRecord && 4629 !UnionFieldRecord->hasTrivialMoveAssignment()) 4630 return true; 4631 } 4632 } 4633 4634 // Don't try to initalize an anonymous union 4635 continue; 4636 // -- a variant member with a non-trivial [move] assignment operator 4637 // and X is a union-like class 4638 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4639 return true; 4640 } 4641 4642 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4643 if (!MoveOper || MoveOper->isDeleted()) 4644 return true; 4645 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4646 return true; 4647 4648 // -- for the move assignment operator, a [non-static data member] with a 4649 // type that does not have a move assignment operator and is not 4650 // trivially copyable. 4651 if (!MoveOper->isMoveAssignmentOperator() && 4652 !FieldRecord->isTriviallyCopyable()) 4653 return true; 4654 } 4655 } 4656 4657 return false; 4658} 4659 4660bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4661 CXXRecordDecl *RD = DD->getParent(); 4662 assert(!RD->isDependentType() && "do deletion after instantiation"); 4663 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4664 return false; 4665 4666 SourceLocation Loc = DD->getLocation(); 4667 4668 // Do access control from the destructor 4669 ContextRAII CtorContext(*this, DD); 4670 4671 bool Union = RD->isUnion(); 4672 4673 // We do this because we should never actually use an anonymous 4674 // union's destructor. 4675 if (Union && RD->isAnonymousStructOrUnion()) 4676 return false; 4677 4678 // C++0x [class.dtor]p5 4679 // A defaulted destructor for a class X is defined as deleted if: 4680 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4681 BE = RD->bases_end(); 4682 BI != BE; ++BI) { 4683 // We'll handle this one later 4684 if (BI->isVirtual()) 4685 continue; 4686 4687 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4688 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4689 assert(BaseDtor && "base has no destructor"); 4690 4691 // -- any direct or virtual base class has a deleted destructor or 4692 // a destructor that is inaccessible from the defaulted destructor 4693 if (BaseDtor->isDeleted()) 4694 return true; 4695 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4696 AR_accessible) 4697 return true; 4698 } 4699 4700 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4701 BE = RD->vbases_end(); 4702 BI != BE; ++BI) { 4703 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4704 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4705 assert(BaseDtor && "base has no destructor"); 4706 4707 // -- any direct or virtual base class has a deleted destructor or 4708 // a destructor that is inaccessible from the defaulted destructor 4709 if (BaseDtor->isDeleted()) 4710 return true; 4711 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4712 AR_accessible) 4713 return true; 4714 } 4715 4716 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4717 FE = RD->field_end(); 4718 FI != FE; ++FI) { 4719 QualType FieldType = Context.getBaseElementType(FI->getType()); 4720 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4721 if (FieldRecord) { 4722 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4723 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4724 UE = FieldRecord->field_end(); 4725 UI != UE; ++UI) { 4726 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4727 CXXRecordDecl *UnionFieldRecord = 4728 UnionFieldType->getAsCXXRecordDecl(); 4729 4730 // -- X is a union-like class that has a variant member with a non- 4731 // trivial destructor. 4732 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4733 return true; 4734 } 4735 // Technically we are supposed to do this next check unconditionally. 4736 // But that makes absolutely no sense. 4737 } else { 4738 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4739 4740 // -- any of the non-static data members has class type M (or array 4741 // thereof) and M has a deleted destructor or a destructor that is 4742 // inaccessible from the defaulted destructor 4743 if (FieldDtor->isDeleted()) 4744 return true; 4745 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4746 AR_accessible) 4747 return true; 4748 4749 // -- X is a union-like class that has a variant member with a non- 4750 // trivial destructor. 4751 if (Union && !FieldDtor->isTrivial()) 4752 return true; 4753 } 4754 } 4755 } 4756 4757 if (DD->isVirtual()) { 4758 FunctionDecl *OperatorDelete = 0; 4759 DeclarationName Name = 4760 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4761 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4762 false)) 4763 return true; 4764 } 4765 4766 4767 return false; 4768} 4769 4770/// \brief Data used with FindHiddenVirtualMethod 4771namespace { 4772 struct FindHiddenVirtualMethodData { 4773 Sema *S; 4774 CXXMethodDecl *Method; 4775 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4776 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4777 }; 4778} 4779 4780/// \brief Member lookup function that determines whether a given C++ 4781/// method overloads virtual methods in a base class without overriding any, 4782/// to be used with CXXRecordDecl::lookupInBases(). 4783static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4784 CXXBasePath &Path, 4785 void *UserData) { 4786 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4787 4788 FindHiddenVirtualMethodData &Data 4789 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4790 4791 DeclarationName Name = Data.Method->getDeclName(); 4792 assert(Name.getNameKind() == DeclarationName::Identifier); 4793 4794 bool foundSameNameMethod = false; 4795 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4796 for (Path.Decls = BaseRecord->lookup(Name); 4797 Path.Decls.first != Path.Decls.second; 4798 ++Path.Decls.first) { 4799 NamedDecl *D = *Path.Decls.first; 4800 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4801 MD = MD->getCanonicalDecl(); 4802 foundSameNameMethod = true; 4803 // Interested only in hidden virtual methods. 4804 if (!MD->isVirtual()) 4805 continue; 4806 // If the method we are checking overrides a method from its base 4807 // don't warn about the other overloaded methods. 4808 if (!Data.S->IsOverload(Data.Method, MD, false)) 4809 return true; 4810 // Collect the overload only if its hidden. 4811 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4812 overloadedMethods.push_back(MD); 4813 } 4814 } 4815 4816 if (foundSameNameMethod) 4817 Data.OverloadedMethods.append(overloadedMethods.begin(), 4818 overloadedMethods.end()); 4819 return foundSameNameMethod; 4820} 4821 4822/// \brief See if a method overloads virtual methods in a base class without 4823/// overriding any. 4824void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4825 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4826 MD->getLocation()) == DiagnosticsEngine::Ignored) 4827 return; 4828 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4829 return; 4830 4831 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4832 /*bool RecordPaths=*/false, 4833 /*bool DetectVirtual=*/false); 4834 FindHiddenVirtualMethodData Data; 4835 Data.Method = MD; 4836 Data.S = this; 4837 4838 // Keep the base methods that were overriden or introduced in the subclass 4839 // by 'using' in a set. A base method not in this set is hidden. 4840 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4841 res.first != res.second; ++res.first) { 4842 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4843 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4844 E = MD->end_overridden_methods(); 4845 I != E; ++I) 4846 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4847 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4848 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4849 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4850 } 4851 4852 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4853 !Data.OverloadedMethods.empty()) { 4854 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4855 << MD << (Data.OverloadedMethods.size() > 1); 4856 4857 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4858 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4859 Diag(overloadedMD->getLocation(), 4860 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4861 } 4862 } 4863} 4864 4865void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4866 Decl *TagDecl, 4867 SourceLocation LBrac, 4868 SourceLocation RBrac, 4869 AttributeList *AttrList) { 4870 if (!TagDecl) 4871 return; 4872 4873 AdjustDeclIfTemplate(TagDecl); 4874 4875 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4876 // strict aliasing violation! 4877 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4878 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4879 4880 CheckCompletedCXXClass( 4881 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4882} 4883 4884/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4885/// special functions, such as the default constructor, copy 4886/// constructor, or destructor, to the given C++ class (C++ 4887/// [special]p1). This routine can only be executed just before the 4888/// definition of the class is complete. 4889void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4890 if (!ClassDecl->hasUserDeclaredConstructor()) 4891 ++ASTContext::NumImplicitDefaultConstructors; 4892 4893 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4894 ++ASTContext::NumImplicitCopyConstructors; 4895 4896 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4897 ++ASTContext::NumImplicitCopyAssignmentOperators; 4898 4899 // If we have a dynamic class, then the copy assignment operator may be 4900 // virtual, so we have to declare it immediately. This ensures that, e.g., 4901 // it shows up in the right place in the vtable and that we diagnose 4902 // problems with the implicit exception specification. 4903 if (ClassDecl->isDynamicClass()) 4904 DeclareImplicitCopyAssignment(ClassDecl); 4905 } 4906 4907 if (!ClassDecl->hasUserDeclaredDestructor()) { 4908 ++ASTContext::NumImplicitDestructors; 4909 4910 // If we have a dynamic class, then the destructor may be virtual, so we 4911 // have to declare the destructor immediately. This ensures that, e.g., it 4912 // shows up in the right place in the vtable and that we diagnose problems 4913 // with the implicit exception specification. 4914 if (ClassDecl->isDynamicClass()) 4915 DeclareImplicitDestructor(ClassDecl); 4916 } 4917} 4918 4919void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4920 if (!D) 4921 return; 4922 4923 int NumParamList = D->getNumTemplateParameterLists(); 4924 for (int i = 0; i < NumParamList; i++) { 4925 TemplateParameterList* Params = D->getTemplateParameterList(i); 4926 for (TemplateParameterList::iterator Param = Params->begin(), 4927 ParamEnd = Params->end(); 4928 Param != ParamEnd; ++Param) { 4929 NamedDecl *Named = cast<NamedDecl>(*Param); 4930 if (Named->getDeclName()) { 4931 S->AddDecl(Named); 4932 IdResolver.AddDecl(Named); 4933 } 4934 } 4935 } 4936} 4937 4938void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4939 if (!D) 4940 return; 4941 4942 TemplateParameterList *Params = 0; 4943 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4944 Params = Template->getTemplateParameters(); 4945 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4946 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4947 Params = PartialSpec->getTemplateParameters(); 4948 else 4949 return; 4950 4951 for (TemplateParameterList::iterator Param = Params->begin(), 4952 ParamEnd = Params->end(); 4953 Param != ParamEnd; ++Param) { 4954 NamedDecl *Named = cast<NamedDecl>(*Param); 4955 if (Named->getDeclName()) { 4956 S->AddDecl(Named); 4957 IdResolver.AddDecl(Named); 4958 } 4959 } 4960} 4961 4962void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4963 if (!RecordD) return; 4964 AdjustDeclIfTemplate(RecordD); 4965 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4966 PushDeclContext(S, Record); 4967} 4968 4969void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4970 if (!RecordD) return; 4971 PopDeclContext(); 4972} 4973 4974/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4975/// parsing a top-level (non-nested) C++ class, and we are now 4976/// parsing those parts of the given Method declaration that could 4977/// not be parsed earlier (C++ [class.mem]p2), such as default 4978/// arguments. This action should enter the scope of the given 4979/// Method declaration as if we had just parsed the qualified method 4980/// name. However, it should not bring the parameters into scope; 4981/// that will be performed by ActOnDelayedCXXMethodParameter. 4982void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4983} 4984 4985/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4986/// C++ method declaration. We're (re-)introducing the given 4987/// function parameter into scope for use in parsing later parts of 4988/// the method declaration. For example, we could see an 4989/// ActOnParamDefaultArgument event for this parameter. 4990void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4991 if (!ParamD) 4992 return; 4993 4994 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4995 4996 // If this parameter has an unparsed default argument, clear it out 4997 // to make way for the parsed default argument. 4998 if (Param->hasUnparsedDefaultArg()) 4999 Param->setDefaultArg(0); 5000 5001 S->AddDecl(Param); 5002 if (Param->getDeclName()) 5003 IdResolver.AddDecl(Param); 5004} 5005 5006/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5007/// processing the delayed method declaration for Method. The method 5008/// declaration is now considered finished. There may be a separate 5009/// ActOnStartOfFunctionDef action later (not necessarily 5010/// immediately!) for this method, if it was also defined inside the 5011/// class body. 5012void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5013 if (!MethodD) 5014 return; 5015 5016 AdjustDeclIfTemplate(MethodD); 5017 5018 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5019 5020 // Now that we have our default arguments, check the constructor 5021 // again. It could produce additional diagnostics or affect whether 5022 // the class has implicitly-declared destructors, among other 5023 // things. 5024 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5025 CheckConstructor(Constructor); 5026 5027 // Check the default arguments, which we may have added. 5028 if (!Method->isInvalidDecl()) 5029 CheckCXXDefaultArguments(Method); 5030} 5031 5032/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5033/// the well-formedness of the constructor declarator @p D with type @p 5034/// R. If there are any errors in the declarator, this routine will 5035/// emit diagnostics and set the invalid bit to true. In any case, the type 5036/// will be updated to reflect a well-formed type for the constructor and 5037/// returned. 5038QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5039 StorageClass &SC) { 5040 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5041 5042 // C++ [class.ctor]p3: 5043 // A constructor shall not be virtual (10.3) or static (9.4). A 5044 // constructor can be invoked for a const, volatile or const 5045 // volatile object. A constructor shall not be declared const, 5046 // volatile, or const volatile (9.3.2). 5047 if (isVirtual) { 5048 if (!D.isInvalidType()) 5049 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5050 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5051 << SourceRange(D.getIdentifierLoc()); 5052 D.setInvalidType(); 5053 } 5054 if (SC == SC_Static) { 5055 if (!D.isInvalidType()) 5056 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5057 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5058 << SourceRange(D.getIdentifierLoc()); 5059 D.setInvalidType(); 5060 SC = SC_None; 5061 } 5062 5063 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5064 if (FTI.TypeQuals != 0) { 5065 if (FTI.TypeQuals & Qualifiers::Const) 5066 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5067 << "const" << SourceRange(D.getIdentifierLoc()); 5068 if (FTI.TypeQuals & Qualifiers::Volatile) 5069 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5070 << "volatile" << SourceRange(D.getIdentifierLoc()); 5071 if (FTI.TypeQuals & Qualifiers::Restrict) 5072 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5073 << "restrict" << SourceRange(D.getIdentifierLoc()); 5074 D.setInvalidType(); 5075 } 5076 5077 // C++0x [class.ctor]p4: 5078 // A constructor shall not be declared with a ref-qualifier. 5079 if (FTI.hasRefQualifier()) { 5080 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5081 << FTI.RefQualifierIsLValueRef 5082 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5083 D.setInvalidType(); 5084 } 5085 5086 // Rebuild the function type "R" without any type qualifiers (in 5087 // case any of the errors above fired) and with "void" as the 5088 // return type, since constructors don't have return types. 5089 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5090 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5091 return R; 5092 5093 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5094 EPI.TypeQuals = 0; 5095 EPI.RefQualifier = RQ_None; 5096 5097 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5098 Proto->getNumArgs(), EPI); 5099} 5100 5101/// CheckConstructor - Checks a fully-formed constructor for 5102/// well-formedness, issuing any diagnostics required. Returns true if 5103/// the constructor declarator is invalid. 5104void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5105 CXXRecordDecl *ClassDecl 5106 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5107 if (!ClassDecl) 5108 return Constructor->setInvalidDecl(); 5109 5110 // C++ [class.copy]p3: 5111 // A declaration of a constructor for a class X is ill-formed if 5112 // its first parameter is of type (optionally cv-qualified) X and 5113 // either there are no other parameters or else all other 5114 // parameters have default arguments. 5115 if (!Constructor->isInvalidDecl() && 5116 ((Constructor->getNumParams() == 1) || 5117 (Constructor->getNumParams() > 1 && 5118 Constructor->getParamDecl(1)->hasDefaultArg())) && 5119 Constructor->getTemplateSpecializationKind() 5120 != TSK_ImplicitInstantiation) { 5121 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5122 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5123 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5124 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5125 const char *ConstRef 5126 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5127 : " const &"; 5128 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5129 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5130 5131 // FIXME: Rather that making the constructor invalid, we should endeavor 5132 // to fix the type. 5133 Constructor->setInvalidDecl(); 5134 } 5135 } 5136} 5137 5138/// CheckDestructor - Checks a fully-formed destructor definition for 5139/// well-formedness, issuing any diagnostics required. Returns true 5140/// on error. 5141bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5142 CXXRecordDecl *RD = Destructor->getParent(); 5143 5144 if (Destructor->isVirtual()) { 5145 SourceLocation Loc; 5146 5147 if (!Destructor->isImplicit()) 5148 Loc = Destructor->getLocation(); 5149 else 5150 Loc = RD->getLocation(); 5151 5152 // If we have a virtual destructor, look up the deallocation function 5153 FunctionDecl *OperatorDelete = 0; 5154 DeclarationName Name = 5155 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5156 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5157 return true; 5158 5159 MarkDeclarationReferenced(Loc, OperatorDelete); 5160 5161 Destructor->setOperatorDelete(OperatorDelete); 5162 } 5163 5164 return false; 5165} 5166 5167static inline bool 5168FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5169 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5170 FTI.ArgInfo[0].Param && 5171 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5172} 5173 5174/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5175/// the well-formednes of the destructor declarator @p D with type @p 5176/// R. If there are any errors in the declarator, this routine will 5177/// emit diagnostics and set the declarator to invalid. Even if this happens, 5178/// will be updated to reflect a well-formed type for the destructor and 5179/// returned. 5180QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5181 StorageClass& SC) { 5182 // C++ [class.dtor]p1: 5183 // [...] A typedef-name that names a class is a class-name 5184 // (7.1.3); however, a typedef-name that names a class shall not 5185 // be used as the identifier in the declarator for a destructor 5186 // declaration. 5187 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5188 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5189 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5190 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5191 else if (const TemplateSpecializationType *TST = 5192 DeclaratorType->getAs<TemplateSpecializationType>()) 5193 if (TST->isTypeAlias()) 5194 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5195 << DeclaratorType << 1; 5196 5197 // C++ [class.dtor]p2: 5198 // A destructor is used to destroy objects of its class type. A 5199 // destructor takes no parameters, and no return type can be 5200 // specified for it (not even void). The address of a destructor 5201 // shall not be taken. A destructor shall not be static. A 5202 // destructor can be invoked for a const, volatile or const 5203 // volatile object. A destructor shall not be declared const, 5204 // volatile or const volatile (9.3.2). 5205 if (SC == SC_Static) { 5206 if (!D.isInvalidType()) 5207 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5208 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5209 << SourceRange(D.getIdentifierLoc()) 5210 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5211 5212 SC = SC_None; 5213 } 5214 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5215 // Destructors don't have return types, but the parser will 5216 // happily parse something like: 5217 // 5218 // class X { 5219 // float ~X(); 5220 // }; 5221 // 5222 // The return type will be eliminated later. 5223 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5224 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5225 << SourceRange(D.getIdentifierLoc()); 5226 } 5227 5228 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5229 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5230 if (FTI.TypeQuals & Qualifiers::Const) 5231 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5232 << "const" << SourceRange(D.getIdentifierLoc()); 5233 if (FTI.TypeQuals & Qualifiers::Volatile) 5234 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5235 << "volatile" << SourceRange(D.getIdentifierLoc()); 5236 if (FTI.TypeQuals & Qualifiers::Restrict) 5237 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5238 << "restrict" << SourceRange(D.getIdentifierLoc()); 5239 D.setInvalidType(); 5240 } 5241 5242 // C++0x [class.dtor]p2: 5243 // A destructor shall not be declared with a ref-qualifier. 5244 if (FTI.hasRefQualifier()) { 5245 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5246 << FTI.RefQualifierIsLValueRef 5247 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5248 D.setInvalidType(); 5249 } 5250 5251 // Make sure we don't have any parameters. 5252 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5253 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5254 5255 // Delete the parameters. 5256 FTI.freeArgs(); 5257 D.setInvalidType(); 5258 } 5259 5260 // Make sure the destructor isn't variadic. 5261 if (FTI.isVariadic) { 5262 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5263 D.setInvalidType(); 5264 } 5265 5266 // Rebuild the function type "R" without any type qualifiers or 5267 // parameters (in case any of the errors above fired) and with 5268 // "void" as the return type, since destructors don't have return 5269 // types. 5270 if (!D.isInvalidType()) 5271 return R; 5272 5273 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5274 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5275 EPI.Variadic = false; 5276 EPI.TypeQuals = 0; 5277 EPI.RefQualifier = RQ_None; 5278 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5279} 5280 5281/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5282/// well-formednes of the conversion function declarator @p D with 5283/// type @p R. If there are any errors in the declarator, this routine 5284/// will emit diagnostics and return true. Otherwise, it will return 5285/// false. Either way, the type @p R will be updated to reflect a 5286/// well-formed type for the conversion operator. 5287void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5288 StorageClass& SC) { 5289 // C++ [class.conv.fct]p1: 5290 // Neither parameter types nor return type can be specified. The 5291 // type of a conversion function (8.3.5) is "function taking no 5292 // parameter returning conversion-type-id." 5293 if (SC == SC_Static) { 5294 if (!D.isInvalidType()) 5295 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5296 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5297 << SourceRange(D.getIdentifierLoc()); 5298 D.setInvalidType(); 5299 SC = SC_None; 5300 } 5301 5302 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5303 5304 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5305 // Conversion functions don't have return types, but the parser will 5306 // happily parse something like: 5307 // 5308 // class X { 5309 // float operator bool(); 5310 // }; 5311 // 5312 // The return type will be changed later anyway. 5313 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5314 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5315 << SourceRange(D.getIdentifierLoc()); 5316 D.setInvalidType(); 5317 } 5318 5319 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5320 5321 // Make sure we don't have any parameters. 5322 if (Proto->getNumArgs() > 0) { 5323 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5324 5325 // Delete the parameters. 5326 D.getFunctionTypeInfo().freeArgs(); 5327 D.setInvalidType(); 5328 } else if (Proto->isVariadic()) { 5329 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5330 D.setInvalidType(); 5331 } 5332 5333 // Diagnose "&operator bool()" and other such nonsense. This 5334 // is actually a gcc extension which we don't support. 5335 if (Proto->getResultType() != ConvType) { 5336 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5337 << Proto->getResultType(); 5338 D.setInvalidType(); 5339 ConvType = Proto->getResultType(); 5340 } 5341 5342 // C++ [class.conv.fct]p4: 5343 // The conversion-type-id shall not represent a function type nor 5344 // an array type. 5345 if (ConvType->isArrayType()) { 5346 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5347 ConvType = Context.getPointerType(ConvType); 5348 D.setInvalidType(); 5349 } else if (ConvType->isFunctionType()) { 5350 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5351 ConvType = Context.getPointerType(ConvType); 5352 D.setInvalidType(); 5353 } 5354 5355 // Rebuild the function type "R" without any parameters (in case any 5356 // of the errors above fired) and with the conversion type as the 5357 // return type. 5358 if (D.isInvalidType()) 5359 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5360 5361 // C++0x explicit conversion operators. 5362 if (D.getDeclSpec().isExplicitSpecified()) 5363 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5364 getLangOptions().CPlusPlus0x ? 5365 diag::warn_cxx98_compat_explicit_conversion_functions : 5366 diag::ext_explicit_conversion_functions) 5367 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5368} 5369 5370/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5371/// the declaration of the given C++ conversion function. This routine 5372/// is responsible for recording the conversion function in the C++ 5373/// class, if possible. 5374Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5375 assert(Conversion && "Expected to receive a conversion function declaration"); 5376 5377 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5378 5379 // Make sure we aren't redeclaring the conversion function. 5380 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5381 5382 // C++ [class.conv.fct]p1: 5383 // [...] A conversion function is never used to convert a 5384 // (possibly cv-qualified) object to the (possibly cv-qualified) 5385 // same object type (or a reference to it), to a (possibly 5386 // cv-qualified) base class of that type (or a reference to it), 5387 // or to (possibly cv-qualified) void. 5388 // FIXME: Suppress this warning if the conversion function ends up being a 5389 // virtual function that overrides a virtual function in a base class. 5390 QualType ClassType 5391 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5392 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5393 ConvType = ConvTypeRef->getPointeeType(); 5394 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5395 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5396 /* Suppress diagnostics for instantiations. */; 5397 else if (ConvType->isRecordType()) { 5398 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5399 if (ConvType == ClassType) 5400 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5401 << ClassType; 5402 else if (IsDerivedFrom(ClassType, ConvType)) 5403 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5404 << ClassType << ConvType; 5405 } else if (ConvType->isVoidType()) { 5406 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5407 << ClassType << ConvType; 5408 } 5409 5410 if (FunctionTemplateDecl *ConversionTemplate 5411 = Conversion->getDescribedFunctionTemplate()) 5412 return ConversionTemplate; 5413 5414 return Conversion; 5415} 5416 5417//===----------------------------------------------------------------------===// 5418// Namespace Handling 5419//===----------------------------------------------------------------------===// 5420 5421 5422 5423/// ActOnStartNamespaceDef - This is called at the start of a namespace 5424/// definition. 5425Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5426 SourceLocation InlineLoc, 5427 SourceLocation NamespaceLoc, 5428 SourceLocation IdentLoc, 5429 IdentifierInfo *II, 5430 SourceLocation LBrace, 5431 AttributeList *AttrList) { 5432 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5433 // For anonymous namespace, take the location of the left brace. 5434 SourceLocation Loc = II ? IdentLoc : LBrace; 5435 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5436 StartLoc, Loc, II); 5437 Namespc->setInline(InlineLoc.isValid()); 5438 5439 Scope *DeclRegionScope = NamespcScope->getParent(); 5440 5441 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5442 5443 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5444 PushNamespaceVisibilityAttr(Attr); 5445 5446 if (II) { 5447 // C++ [namespace.def]p2: 5448 // The identifier in an original-namespace-definition shall not 5449 // have been previously defined in the declarative region in 5450 // which the original-namespace-definition appears. The 5451 // identifier in an original-namespace-definition is the name of 5452 // the namespace. Subsequently in that declarative region, it is 5453 // treated as an original-namespace-name. 5454 // 5455 // Since namespace names are unique in their scope, and we don't 5456 // look through using directives, just look for any ordinary names. 5457 5458 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5459 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5460 Decl::IDNS_Namespace; 5461 NamedDecl *PrevDecl = 0; 5462 for (DeclContext::lookup_result R 5463 = CurContext->getRedeclContext()->lookup(II); 5464 R.first != R.second; ++R.first) { 5465 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5466 PrevDecl = *R.first; 5467 break; 5468 } 5469 } 5470 5471 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5472 // This is an extended namespace definition. 5473 if (Namespc->isInline() != OrigNS->isInline()) { 5474 // inline-ness must match 5475 if (OrigNS->isInline()) { 5476 // The user probably just forgot the 'inline', so suggest that it 5477 // be added back. 5478 Diag(Namespc->getLocation(), 5479 diag::warn_inline_namespace_reopened_noninline) 5480 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5481 } else { 5482 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5483 << Namespc->isInline(); 5484 } 5485 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5486 5487 // Recover by ignoring the new namespace's inline status. 5488 Namespc->setInline(OrigNS->isInline()); 5489 } 5490 5491 // Attach this namespace decl to the chain of extended namespace 5492 // definitions. 5493 OrigNS->setNextNamespace(Namespc); 5494 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5495 5496 // Remove the previous declaration from the scope. 5497 if (DeclRegionScope->isDeclScope(OrigNS)) { 5498 IdResolver.RemoveDecl(OrigNS); 5499 DeclRegionScope->RemoveDecl(OrigNS); 5500 } 5501 } else if (PrevDecl) { 5502 // This is an invalid name redefinition. 5503 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5504 << Namespc->getDeclName(); 5505 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5506 Namespc->setInvalidDecl(); 5507 // Continue on to push Namespc as current DeclContext and return it. 5508 } else if (II->isStr("std") && 5509 CurContext->getRedeclContext()->isTranslationUnit()) { 5510 // This is the first "real" definition of the namespace "std", so update 5511 // our cache of the "std" namespace to point at this definition. 5512 if (NamespaceDecl *StdNS = getStdNamespace()) { 5513 // We had already defined a dummy namespace "std". Link this new 5514 // namespace definition to the dummy namespace "std". 5515 StdNS->setNextNamespace(Namespc); 5516 StdNS->setLocation(IdentLoc); 5517 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5518 } 5519 5520 // Make our StdNamespace cache point at the first real definition of the 5521 // "std" namespace. 5522 StdNamespace = Namespc; 5523 5524 // Add this instance of "std" to the set of known namespaces 5525 KnownNamespaces[Namespc] = false; 5526 } else if (!Namespc->isInline()) { 5527 // Since this is an "original" namespace, add it to the known set of 5528 // namespaces if it is not an inline namespace. 5529 KnownNamespaces[Namespc] = false; 5530 } 5531 5532 PushOnScopeChains(Namespc, DeclRegionScope); 5533 } else { 5534 // Anonymous namespaces. 5535 assert(Namespc->isAnonymousNamespace()); 5536 5537 // Link the anonymous namespace into its parent. 5538 NamespaceDecl *PrevDecl; 5539 DeclContext *Parent = CurContext->getRedeclContext(); 5540 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5541 PrevDecl = TU->getAnonymousNamespace(); 5542 TU->setAnonymousNamespace(Namespc); 5543 } else { 5544 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5545 PrevDecl = ND->getAnonymousNamespace(); 5546 ND->setAnonymousNamespace(Namespc); 5547 } 5548 5549 // Link the anonymous namespace with its previous declaration. 5550 if (PrevDecl) { 5551 assert(PrevDecl->isAnonymousNamespace()); 5552 assert(!PrevDecl->getNextNamespace()); 5553 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5554 PrevDecl->setNextNamespace(Namespc); 5555 5556 if (Namespc->isInline() != PrevDecl->isInline()) { 5557 // inline-ness must match 5558 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5559 << Namespc->isInline(); 5560 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5561 Namespc->setInvalidDecl(); 5562 // Recover by ignoring the new namespace's inline status. 5563 Namespc->setInline(PrevDecl->isInline()); 5564 } 5565 } 5566 5567 CurContext->addDecl(Namespc); 5568 5569 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5570 // behaves as if it were replaced by 5571 // namespace unique { /* empty body */ } 5572 // using namespace unique; 5573 // namespace unique { namespace-body } 5574 // where all occurrences of 'unique' in a translation unit are 5575 // replaced by the same identifier and this identifier differs 5576 // from all other identifiers in the entire program. 5577 5578 // We just create the namespace with an empty name and then add an 5579 // implicit using declaration, just like the standard suggests. 5580 // 5581 // CodeGen enforces the "universally unique" aspect by giving all 5582 // declarations semantically contained within an anonymous 5583 // namespace internal linkage. 5584 5585 if (!PrevDecl) { 5586 UsingDirectiveDecl* UD 5587 = UsingDirectiveDecl::Create(Context, CurContext, 5588 /* 'using' */ LBrace, 5589 /* 'namespace' */ SourceLocation(), 5590 /* qualifier */ NestedNameSpecifierLoc(), 5591 /* identifier */ SourceLocation(), 5592 Namespc, 5593 /* Ancestor */ CurContext); 5594 UD->setImplicit(); 5595 CurContext->addDecl(UD); 5596 } 5597 } 5598 5599 // Although we could have an invalid decl (i.e. the namespace name is a 5600 // redefinition), push it as current DeclContext and try to continue parsing. 5601 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5602 // for the namespace has the declarations that showed up in that particular 5603 // namespace definition. 5604 PushDeclContext(NamespcScope, Namespc); 5605 return Namespc; 5606} 5607 5608/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5609/// is a namespace alias, returns the namespace it points to. 5610static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5611 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5612 return AD->getNamespace(); 5613 return dyn_cast_or_null<NamespaceDecl>(D); 5614} 5615 5616/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5617/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5618void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5619 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5620 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5621 Namespc->setRBraceLoc(RBrace); 5622 PopDeclContext(); 5623 if (Namespc->hasAttr<VisibilityAttr>()) 5624 PopPragmaVisibility(); 5625} 5626 5627CXXRecordDecl *Sema::getStdBadAlloc() const { 5628 return cast_or_null<CXXRecordDecl>( 5629 StdBadAlloc.get(Context.getExternalSource())); 5630} 5631 5632NamespaceDecl *Sema::getStdNamespace() const { 5633 return cast_or_null<NamespaceDecl>( 5634 StdNamespace.get(Context.getExternalSource())); 5635} 5636 5637/// \brief Retrieve the special "std" namespace, which may require us to 5638/// implicitly define the namespace. 5639NamespaceDecl *Sema::getOrCreateStdNamespace() { 5640 if (!StdNamespace) { 5641 // The "std" namespace has not yet been defined, so build one implicitly. 5642 StdNamespace = NamespaceDecl::Create(Context, 5643 Context.getTranslationUnitDecl(), 5644 SourceLocation(), SourceLocation(), 5645 &PP.getIdentifierTable().get("std")); 5646 getStdNamespace()->setImplicit(true); 5647 } 5648 5649 return getStdNamespace(); 5650} 5651 5652/// \brief Determine whether a using statement is in a context where it will be 5653/// apply in all contexts. 5654static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5655 switch (CurContext->getDeclKind()) { 5656 case Decl::TranslationUnit: 5657 return true; 5658 case Decl::LinkageSpec: 5659 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5660 default: 5661 return false; 5662 } 5663} 5664 5665static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5666 CXXScopeSpec &SS, 5667 SourceLocation IdentLoc, 5668 IdentifierInfo *Ident) { 5669 R.clear(); 5670 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5671 R.getLookupKind(), Sc, &SS, NULL, 5672 false, S.CTC_NoKeywords, NULL)) { 5673 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5674 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5675 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5676 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5677 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5678 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5679 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5680 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5681 else 5682 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5683 << Ident << CorrectedQuotedStr 5684 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5685 5686 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5687 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5688 5689 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5690 R.addDecl(Corrected.getCorrectionDecl()); 5691 return true; 5692 } 5693 R.setLookupName(Ident); 5694 } 5695 return false; 5696} 5697 5698Decl *Sema::ActOnUsingDirective(Scope *S, 5699 SourceLocation UsingLoc, 5700 SourceLocation NamespcLoc, 5701 CXXScopeSpec &SS, 5702 SourceLocation IdentLoc, 5703 IdentifierInfo *NamespcName, 5704 AttributeList *AttrList) { 5705 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5706 assert(NamespcName && "Invalid NamespcName."); 5707 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5708 5709 // This can only happen along a recovery path. 5710 while (S->getFlags() & Scope::TemplateParamScope) 5711 S = S->getParent(); 5712 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5713 5714 UsingDirectiveDecl *UDir = 0; 5715 NestedNameSpecifier *Qualifier = 0; 5716 if (SS.isSet()) 5717 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5718 5719 // Lookup namespace name. 5720 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5721 LookupParsedName(R, S, &SS); 5722 if (R.isAmbiguous()) 5723 return 0; 5724 5725 if (R.empty()) { 5726 R.clear(); 5727 // Allow "using namespace std;" or "using namespace ::std;" even if 5728 // "std" hasn't been defined yet, for GCC compatibility. 5729 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5730 NamespcName->isStr("std")) { 5731 Diag(IdentLoc, diag::ext_using_undefined_std); 5732 R.addDecl(getOrCreateStdNamespace()); 5733 R.resolveKind(); 5734 } 5735 // Otherwise, attempt typo correction. 5736 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5737 } 5738 5739 if (!R.empty()) { 5740 NamedDecl *Named = R.getFoundDecl(); 5741 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5742 && "expected namespace decl"); 5743 // C++ [namespace.udir]p1: 5744 // A using-directive specifies that the names in the nominated 5745 // namespace can be used in the scope in which the 5746 // using-directive appears after the using-directive. During 5747 // unqualified name lookup (3.4.1), the names appear as if they 5748 // were declared in the nearest enclosing namespace which 5749 // contains both the using-directive and the nominated 5750 // namespace. [Note: in this context, "contains" means "contains 5751 // directly or indirectly". ] 5752 5753 // Find enclosing context containing both using-directive and 5754 // nominated namespace. 5755 NamespaceDecl *NS = getNamespaceDecl(Named); 5756 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5757 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5758 CommonAncestor = CommonAncestor->getParent(); 5759 5760 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5761 SS.getWithLocInContext(Context), 5762 IdentLoc, Named, CommonAncestor); 5763 5764 if (IsUsingDirectiveInToplevelContext(CurContext) && 5765 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5766 Diag(IdentLoc, diag::warn_using_directive_in_header); 5767 } 5768 5769 PushUsingDirective(S, UDir); 5770 } else { 5771 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5772 } 5773 5774 // FIXME: We ignore attributes for now. 5775 return UDir; 5776} 5777 5778void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5779 // If scope has associated entity, then using directive is at namespace 5780 // or translation unit scope. We add UsingDirectiveDecls, into 5781 // it's lookup structure. 5782 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5783 Ctx->addDecl(UDir); 5784 else 5785 // Otherwise it is block-sope. using-directives will affect lookup 5786 // only to the end of scope. 5787 S->PushUsingDirective(UDir); 5788} 5789 5790 5791Decl *Sema::ActOnUsingDeclaration(Scope *S, 5792 AccessSpecifier AS, 5793 bool HasUsingKeyword, 5794 SourceLocation UsingLoc, 5795 CXXScopeSpec &SS, 5796 UnqualifiedId &Name, 5797 AttributeList *AttrList, 5798 bool IsTypeName, 5799 SourceLocation TypenameLoc) { 5800 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5801 5802 switch (Name.getKind()) { 5803 case UnqualifiedId::IK_ImplicitSelfParam: 5804 case UnqualifiedId::IK_Identifier: 5805 case UnqualifiedId::IK_OperatorFunctionId: 5806 case UnqualifiedId::IK_LiteralOperatorId: 5807 case UnqualifiedId::IK_ConversionFunctionId: 5808 break; 5809 5810 case UnqualifiedId::IK_ConstructorName: 5811 case UnqualifiedId::IK_ConstructorTemplateId: 5812 // C++0x inherited constructors. 5813 Diag(Name.getSourceRange().getBegin(), 5814 getLangOptions().CPlusPlus0x ? 5815 diag::warn_cxx98_compat_using_decl_constructor : 5816 diag::err_using_decl_constructor) 5817 << SS.getRange(); 5818 5819 if (getLangOptions().CPlusPlus0x) break; 5820 5821 return 0; 5822 5823 case UnqualifiedId::IK_DestructorName: 5824 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5825 << SS.getRange(); 5826 return 0; 5827 5828 case UnqualifiedId::IK_TemplateId: 5829 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5830 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5831 return 0; 5832 } 5833 5834 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5835 DeclarationName TargetName = TargetNameInfo.getName(); 5836 if (!TargetName) 5837 return 0; 5838 5839 // Warn about using declarations. 5840 // TODO: store that the declaration was written without 'using' and 5841 // talk about access decls instead of using decls in the 5842 // diagnostics. 5843 if (!HasUsingKeyword) { 5844 UsingLoc = Name.getSourceRange().getBegin(); 5845 5846 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5847 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5848 } 5849 5850 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5851 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5852 return 0; 5853 5854 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5855 TargetNameInfo, AttrList, 5856 /* IsInstantiation */ false, 5857 IsTypeName, TypenameLoc); 5858 if (UD) 5859 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5860 5861 return UD; 5862} 5863 5864/// \brief Determine whether a using declaration considers the given 5865/// declarations as "equivalent", e.g., if they are redeclarations of 5866/// the same entity or are both typedefs of the same type. 5867static bool 5868IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5869 bool &SuppressRedeclaration) { 5870 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5871 SuppressRedeclaration = false; 5872 return true; 5873 } 5874 5875 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5876 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5877 SuppressRedeclaration = true; 5878 return Context.hasSameType(TD1->getUnderlyingType(), 5879 TD2->getUnderlyingType()); 5880 } 5881 5882 return false; 5883} 5884 5885 5886/// Determines whether to create a using shadow decl for a particular 5887/// decl, given the set of decls existing prior to this using lookup. 5888bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5889 const LookupResult &Previous) { 5890 // Diagnose finding a decl which is not from a base class of the 5891 // current class. We do this now because there are cases where this 5892 // function will silently decide not to build a shadow decl, which 5893 // will pre-empt further diagnostics. 5894 // 5895 // We don't need to do this in C++0x because we do the check once on 5896 // the qualifier. 5897 // 5898 // FIXME: diagnose the following if we care enough: 5899 // struct A { int foo; }; 5900 // struct B : A { using A::foo; }; 5901 // template <class T> struct C : A {}; 5902 // template <class T> struct D : C<T> { using B::foo; } // <--- 5903 // This is invalid (during instantiation) in C++03 because B::foo 5904 // resolves to the using decl in B, which is not a base class of D<T>. 5905 // We can't diagnose it immediately because C<T> is an unknown 5906 // specialization. The UsingShadowDecl in D<T> then points directly 5907 // to A::foo, which will look well-formed when we instantiate. 5908 // The right solution is to not collapse the shadow-decl chain. 5909 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5910 DeclContext *OrigDC = Orig->getDeclContext(); 5911 5912 // Handle enums and anonymous structs. 5913 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5914 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5915 while (OrigRec->isAnonymousStructOrUnion()) 5916 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5917 5918 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5919 if (OrigDC == CurContext) { 5920 Diag(Using->getLocation(), 5921 diag::err_using_decl_nested_name_specifier_is_current_class) 5922 << Using->getQualifierLoc().getSourceRange(); 5923 Diag(Orig->getLocation(), diag::note_using_decl_target); 5924 return true; 5925 } 5926 5927 Diag(Using->getQualifierLoc().getBeginLoc(), 5928 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5929 << Using->getQualifier() 5930 << cast<CXXRecordDecl>(CurContext) 5931 << Using->getQualifierLoc().getSourceRange(); 5932 Diag(Orig->getLocation(), diag::note_using_decl_target); 5933 return true; 5934 } 5935 } 5936 5937 if (Previous.empty()) return false; 5938 5939 NamedDecl *Target = Orig; 5940 if (isa<UsingShadowDecl>(Target)) 5941 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5942 5943 // If the target happens to be one of the previous declarations, we 5944 // don't have a conflict. 5945 // 5946 // FIXME: but we might be increasing its access, in which case we 5947 // should redeclare it. 5948 NamedDecl *NonTag = 0, *Tag = 0; 5949 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5950 I != E; ++I) { 5951 NamedDecl *D = (*I)->getUnderlyingDecl(); 5952 bool Result; 5953 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5954 return Result; 5955 5956 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5957 } 5958 5959 if (Target->isFunctionOrFunctionTemplate()) { 5960 FunctionDecl *FD; 5961 if (isa<FunctionTemplateDecl>(Target)) 5962 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5963 else 5964 FD = cast<FunctionDecl>(Target); 5965 5966 NamedDecl *OldDecl = 0; 5967 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5968 case Ovl_Overload: 5969 return false; 5970 5971 case Ovl_NonFunction: 5972 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5973 break; 5974 5975 // We found a decl with the exact signature. 5976 case Ovl_Match: 5977 // If we're in a record, we want to hide the target, so we 5978 // return true (without a diagnostic) to tell the caller not to 5979 // build a shadow decl. 5980 if (CurContext->isRecord()) 5981 return true; 5982 5983 // If we're not in a record, this is an error. 5984 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5985 break; 5986 } 5987 5988 Diag(Target->getLocation(), diag::note_using_decl_target); 5989 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5990 return true; 5991 } 5992 5993 // Target is not a function. 5994 5995 if (isa<TagDecl>(Target)) { 5996 // No conflict between a tag and a non-tag. 5997 if (!Tag) return false; 5998 5999 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6000 Diag(Target->getLocation(), diag::note_using_decl_target); 6001 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6002 return true; 6003 } 6004 6005 // No conflict between a tag and a non-tag. 6006 if (!NonTag) return false; 6007 6008 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6009 Diag(Target->getLocation(), diag::note_using_decl_target); 6010 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6011 return true; 6012} 6013 6014/// Builds a shadow declaration corresponding to a 'using' declaration. 6015UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6016 UsingDecl *UD, 6017 NamedDecl *Orig) { 6018 6019 // If we resolved to another shadow declaration, just coalesce them. 6020 NamedDecl *Target = Orig; 6021 if (isa<UsingShadowDecl>(Target)) { 6022 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6023 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6024 } 6025 6026 UsingShadowDecl *Shadow 6027 = UsingShadowDecl::Create(Context, CurContext, 6028 UD->getLocation(), UD, Target); 6029 UD->addShadowDecl(Shadow); 6030 6031 Shadow->setAccess(UD->getAccess()); 6032 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6033 Shadow->setInvalidDecl(); 6034 6035 if (S) 6036 PushOnScopeChains(Shadow, S); 6037 else 6038 CurContext->addDecl(Shadow); 6039 6040 6041 return Shadow; 6042} 6043 6044/// Hides a using shadow declaration. This is required by the current 6045/// using-decl implementation when a resolvable using declaration in a 6046/// class is followed by a declaration which would hide or override 6047/// one or more of the using decl's targets; for example: 6048/// 6049/// struct Base { void foo(int); }; 6050/// struct Derived : Base { 6051/// using Base::foo; 6052/// void foo(int); 6053/// }; 6054/// 6055/// The governing language is C++03 [namespace.udecl]p12: 6056/// 6057/// When a using-declaration brings names from a base class into a 6058/// derived class scope, member functions in the derived class 6059/// override and/or hide member functions with the same name and 6060/// parameter types in a base class (rather than conflicting). 6061/// 6062/// There are two ways to implement this: 6063/// (1) optimistically create shadow decls when they're not hidden 6064/// by existing declarations, or 6065/// (2) don't create any shadow decls (or at least don't make them 6066/// visible) until we've fully parsed/instantiated the class. 6067/// The problem with (1) is that we might have to retroactively remove 6068/// a shadow decl, which requires several O(n) operations because the 6069/// decl structures are (very reasonably) not designed for removal. 6070/// (2) avoids this but is very fiddly and phase-dependent. 6071void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6072 if (Shadow->getDeclName().getNameKind() == 6073 DeclarationName::CXXConversionFunctionName) 6074 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6075 6076 // Remove it from the DeclContext... 6077 Shadow->getDeclContext()->removeDecl(Shadow); 6078 6079 // ...and the scope, if applicable... 6080 if (S) { 6081 S->RemoveDecl(Shadow); 6082 IdResolver.RemoveDecl(Shadow); 6083 } 6084 6085 // ...and the using decl. 6086 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6087 6088 // TODO: complain somehow if Shadow was used. It shouldn't 6089 // be possible for this to happen, because...? 6090} 6091 6092/// Builds a using declaration. 6093/// 6094/// \param IsInstantiation - Whether this call arises from an 6095/// instantiation of an unresolved using declaration. We treat 6096/// the lookup differently for these declarations. 6097NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6098 SourceLocation UsingLoc, 6099 CXXScopeSpec &SS, 6100 const DeclarationNameInfo &NameInfo, 6101 AttributeList *AttrList, 6102 bool IsInstantiation, 6103 bool IsTypeName, 6104 SourceLocation TypenameLoc) { 6105 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6106 SourceLocation IdentLoc = NameInfo.getLoc(); 6107 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6108 6109 // FIXME: We ignore attributes for now. 6110 6111 if (SS.isEmpty()) { 6112 Diag(IdentLoc, diag::err_using_requires_qualname); 6113 return 0; 6114 } 6115 6116 // Do the redeclaration lookup in the current scope. 6117 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6118 ForRedeclaration); 6119 Previous.setHideTags(false); 6120 if (S) { 6121 LookupName(Previous, S); 6122 6123 // It is really dumb that we have to do this. 6124 LookupResult::Filter F = Previous.makeFilter(); 6125 while (F.hasNext()) { 6126 NamedDecl *D = F.next(); 6127 if (!isDeclInScope(D, CurContext, S)) 6128 F.erase(); 6129 } 6130 F.done(); 6131 } else { 6132 assert(IsInstantiation && "no scope in non-instantiation"); 6133 assert(CurContext->isRecord() && "scope not record in instantiation"); 6134 LookupQualifiedName(Previous, CurContext); 6135 } 6136 6137 // Check for invalid redeclarations. 6138 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6139 return 0; 6140 6141 // Check for bad qualifiers. 6142 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6143 return 0; 6144 6145 DeclContext *LookupContext = computeDeclContext(SS); 6146 NamedDecl *D; 6147 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6148 if (!LookupContext) { 6149 if (IsTypeName) { 6150 // FIXME: not all declaration name kinds are legal here 6151 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6152 UsingLoc, TypenameLoc, 6153 QualifierLoc, 6154 IdentLoc, NameInfo.getName()); 6155 } else { 6156 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6157 QualifierLoc, NameInfo); 6158 } 6159 } else { 6160 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6161 NameInfo, IsTypeName); 6162 } 6163 D->setAccess(AS); 6164 CurContext->addDecl(D); 6165 6166 if (!LookupContext) return D; 6167 UsingDecl *UD = cast<UsingDecl>(D); 6168 6169 if (RequireCompleteDeclContext(SS, LookupContext)) { 6170 UD->setInvalidDecl(); 6171 return UD; 6172 } 6173 6174 // Constructor inheriting using decls get special treatment. 6175 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6176 if (CheckInheritedConstructorUsingDecl(UD)) 6177 UD->setInvalidDecl(); 6178 return UD; 6179 } 6180 6181 // Otherwise, look up the target name. 6182 6183 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6184 6185 // Unlike most lookups, we don't always want to hide tag 6186 // declarations: tag names are visible through the using declaration 6187 // even if hidden by ordinary names, *except* in a dependent context 6188 // where it's important for the sanity of two-phase lookup. 6189 if (!IsInstantiation) 6190 R.setHideTags(false); 6191 6192 LookupQualifiedName(R, LookupContext); 6193 6194 if (R.empty()) { 6195 Diag(IdentLoc, diag::err_no_member) 6196 << NameInfo.getName() << LookupContext << SS.getRange(); 6197 UD->setInvalidDecl(); 6198 return UD; 6199 } 6200 6201 if (R.isAmbiguous()) { 6202 UD->setInvalidDecl(); 6203 return UD; 6204 } 6205 6206 if (IsTypeName) { 6207 // If we asked for a typename and got a non-type decl, error out. 6208 if (!R.getAsSingle<TypeDecl>()) { 6209 Diag(IdentLoc, diag::err_using_typename_non_type); 6210 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6211 Diag((*I)->getUnderlyingDecl()->getLocation(), 6212 diag::note_using_decl_target); 6213 UD->setInvalidDecl(); 6214 return UD; 6215 } 6216 } else { 6217 // If we asked for a non-typename and we got a type, error out, 6218 // but only if this is an instantiation of an unresolved using 6219 // decl. Otherwise just silently find the type name. 6220 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6221 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6222 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6223 UD->setInvalidDecl(); 6224 return UD; 6225 } 6226 } 6227 6228 // C++0x N2914 [namespace.udecl]p6: 6229 // A using-declaration shall not name a namespace. 6230 if (R.getAsSingle<NamespaceDecl>()) { 6231 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6232 << SS.getRange(); 6233 UD->setInvalidDecl(); 6234 return UD; 6235 } 6236 6237 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6238 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6239 BuildUsingShadowDecl(S, UD, *I); 6240 } 6241 6242 return UD; 6243} 6244 6245/// Additional checks for a using declaration referring to a constructor name. 6246bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6247 if (UD->isTypeName()) { 6248 // FIXME: Cannot specify typename when specifying constructor 6249 return true; 6250 } 6251 6252 const Type *SourceType = UD->getQualifier()->getAsType(); 6253 assert(SourceType && 6254 "Using decl naming constructor doesn't have type in scope spec."); 6255 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6256 6257 // Check whether the named type is a direct base class. 6258 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6259 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6260 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6261 BaseIt != BaseE; ++BaseIt) { 6262 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6263 if (CanonicalSourceType == BaseType) 6264 break; 6265 } 6266 6267 if (BaseIt == BaseE) { 6268 // Did not find SourceType in the bases. 6269 Diag(UD->getUsingLocation(), 6270 diag::err_using_decl_constructor_not_in_direct_base) 6271 << UD->getNameInfo().getSourceRange() 6272 << QualType(SourceType, 0) << TargetClass; 6273 return true; 6274 } 6275 6276 BaseIt->setInheritConstructors(); 6277 6278 return false; 6279} 6280 6281/// Checks that the given using declaration is not an invalid 6282/// redeclaration. Note that this is checking only for the using decl 6283/// itself, not for any ill-formedness among the UsingShadowDecls. 6284bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6285 bool isTypeName, 6286 const CXXScopeSpec &SS, 6287 SourceLocation NameLoc, 6288 const LookupResult &Prev) { 6289 // C++03 [namespace.udecl]p8: 6290 // C++0x [namespace.udecl]p10: 6291 // A using-declaration is a declaration and can therefore be used 6292 // repeatedly where (and only where) multiple declarations are 6293 // allowed. 6294 // 6295 // That's in non-member contexts. 6296 if (!CurContext->getRedeclContext()->isRecord()) 6297 return false; 6298 6299 NestedNameSpecifier *Qual 6300 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6301 6302 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6303 NamedDecl *D = *I; 6304 6305 bool DTypename; 6306 NestedNameSpecifier *DQual; 6307 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6308 DTypename = UD->isTypeName(); 6309 DQual = UD->getQualifier(); 6310 } else if (UnresolvedUsingValueDecl *UD 6311 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6312 DTypename = false; 6313 DQual = UD->getQualifier(); 6314 } else if (UnresolvedUsingTypenameDecl *UD 6315 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6316 DTypename = true; 6317 DQual = UD->getQualifier(); 6318 } else continue; 6319 6320 // using decls differ if one says 'typename' and the other doesn't. 6321 // FIXME: non-dependent using decls? 6322 if (isTypeName != DTypename) continue; 6323 6324 // using decls differ if they name different scopes (but note that 6325 // template instantiation can cause this check to trigger when it 6326 // didn't before instantiation). 6327 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6328 Context.getCanonicalNestedNameSpecifier(DQual)) 6329 continue; 6330 6331 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6332 Diag(D->getLocation(), diag::note_using_decl) << 1; 6333 return true; 6334 } 6335 6336 return false; 6337} 6338 6339 6340/// Checks that the given nested-name qualifier used in a using decl 6341/// in the current context is appropriately related to the current 6342/// scope. If an error is found, diagnoses it and returns true. 6343bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6344 const CXXScopeSpec &SS, 6345 SourceLocation NameLoc) { 6346 DeclContext *NamedContext = computeDeclContext(SS); 6347 6348 if (!CurContext->isRecord()) { 6349 // C++03 [namespace.udecl]p3: 6350 // C++0x [namespace.udecl]p8: 6351 // A using-declaration for a class member shall be a member-declaration. 6352 6353 // If we weren't able to compute a valid scope, it must be a 6354 // dependent class scope. 6355 if (!NamedContext || NamedContext->isRecord()) { 6356 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6357 << SS.getRange(); 6358 return true; 6359 } 6360 6361 // Otherwise, everything is known to be fine. 6362 return false; 6363 } 6364 6365 // The current scope is a record. 6366 6367 // If the named context is dependent, we can't decide much. 6368 if (!NamedContext) { 6369 // FIXME: in C++0x, we can diagnose if we can prove that the 6370 // nested-name-specifier does not refer to a base class, which is 6371 // still possible in some cases. 6372 6373 // Otherwise we have to conservatively report that things might be 6374 // okay. 6375 return false; 6376 } 6377 6378 if (!NamedContext->isRecord()) { 6379 // Ideally this would point at the last name in the specifier, 6380 // but we don't have that level of source info. 6381 Diag(SS.getRange().getBegin(), 6382 diag::err_using_decl_nested_name_specifier_is_not_class) 6383 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6384 return true; 6385 } 6386 6387 if (!NamedContext->isDependentContext() && 6388 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6389 return true; 6390 6391 if (getLangOptions().CPlusPlus0x) { 6392 // C++0x [namespace.udecl]p3: 6393 // In a using-declaration used as a member-declaration, the 6394 // nested-name-specifier shall name a base class of the class 6395 // being defined. 6396 6397 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6398 cast<CXXRecordDecl>(NamedContext))) { 6399 if (CurContext == NamedContext) { 6400 Diag(NameLoc, 6401 diag::err_using_decl_nested_name_specifier_is_current_class) 6402 << SS.getRange(); 6403 return true; 6404 } 6405 6406 Diag(SS.getRange().getBegin(), 6407 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6408 << (NestedNameSpecifier*) SS.getScopeRep() 6409 << cast<CXXRecordDecl>(CurContext) 6410 << SS.getRange(); 6411 return true; 6412 } 6413 6414 return false; 6415 } 6416 6417 // C++03 [namespace.udecl]p4: 6418 // A using-declaration used as a member-declaration shall refer 6419 // to a member of a base class of the class being defined [etc.]. 6420 6421 // Salient point: SS doesn't have to name a base class as long as 6422 // lookup only finds members from base classes. Therefore we can 6423 // diagnose here only if we can prove that that can't happen, 6424 // i.e. if the class hierarchies provably don't intersect. 6425 6426 // TODO: it would be nice if "definitely valid" results were cached 6427 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6428 // need to be repeated. 6429 6430 struct UserData { 6431 llvm::DenseSet<const CXXRecordDecl*> Bases; 6432 6433 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6434 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6435 Data->Bases.insert(Base); 6436 return true; 6437 } 6438 6439 bool hasDependentBases(const CXXRecordDecl *Class) { 6440 return !Class->forallBases(collect, this); 6441 } 6442 6443 /// Returns true if the base is dependent or is one of the 6444 /// accumulated base classes. 6445 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6446 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6447 return !Data->Bases.count(Base); 6448 } 6449 6450 bool mightShareBases(const CXXRecordDecl *Class) { 6451 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6452 } 6453 }; 6454 6455 UserData Data; 6456 6457 // Returns false if we find a dependent base. 6458 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6459 return false; 6460 6461 // Returns false if the class has a dependent base or if it or one 6462 // of its bases is present in the base set of the current context. 6463 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6464 return false; 6465 6466 Diag(SS.getRange().getBegin(), 6467 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6468 << (NestedNameSpecifier*) SS.getScopeRep() 6469 << cast<CXXRecordDecl>(CurContext) 6470 << SS.getRange(); 6471 6472 return true; 6473} 6474 6475Decl *Sema::ActOnAliasDeclaration(Scope *S, 6476 AccessSpecifier AS, 6477 MultiTemplateParamsArg TemplateParamLists, 6478 SourceLocation UsingLoc, 6479 UnqualifiedId &Name, 6480 TypeResult Type) { 6481 // Skip up to the relevant declaration scope. 6482 while (S->getFlags() & Scope::TemplateParamScope) 6483 S = S->getParent(); 6484 assert((S->getFlags() & Scope::DeclScope) && 6485 "got alias-declaration outside of declaration scope"); 6486 6487 if (Type.isInvalid()) 6488 return 0; 6489 6490 bool Invalid = false; 6491 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6492 TypeSourceInfo *TInfo = 0; 6493 GetTypeFromParser(Type.get(), &TInfo); 6494 6495 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6496 return 0; 6497 6498 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6499 UPPC_DeclarationType)) { 6500 Invalid = true; 6501 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6502 TInfo->getTypeLoc().getBeginLoc()); 6503 } 6504 6505 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6506 LookupName(Previous, S); 6507 6508 // Warn about shadowing the name of a template parameter. 6509 if (Previous.isSingleResult() && 6510 Previous.getFoundDecl()->isTemplateParameter()) { 6511 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6512 Previous.clear(); 6513 } 6514 6515 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6516 "name in alias declaration must be an identifier"); 6517 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6518 Name.StartLocation, 6519 Name.Identifier, TInfo); 6520 6521 NewTD->setAccess(AS); 6522 6523 if (Invalid) 6524 NewTD->setInvalidDecl(); 6525 6526 CheckTypedefForVariablyModifiedType(S, NewTD); 6527 Invalid |= NewTD->isInvalidDecl(); 6528 6529 bool Redeclaration = false; 6530 6531 NamedDecl *NewND; 6532 if (TemplateParamLists.size()) { 6533 TypeAliasTemplateDecl *OldDecl = 0; 6534 TemplateParameterList *OldTemplateParams = 0; 6535 6536 if (TemplateParamLists.size() != 1) { 6537 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6538 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6539 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6540 } 6541 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6542 6543 // Only consider previous declarations in the same scope. 6544 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6545 /*ExplicitInstantiationOrSpecialization*/false); 6546 if (!Previous.empty()) { 6547 Redeclaration = true; 6548 6549 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6550 if (!OldDecl && !Invalid) { 6551 Diag(UsingLoc, diag::err_redefinition_different_kind) 6552 << Name.Identifier; 6553 6554 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6555 if (OldD->getLocation().isValid()) 6556 Diag(OldD->getLocation(), diag::note_previous_definition); 6557 6558 Invalid = true; 6559 } 6560 6561 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6562 if (TemplateParameterListsAreEqual(TemplateParams, 6563 OldDecl->getTemplateParameters(), 6564 /*Complain=*/true, 6565 TPL_TemplateMatch)) 6566 OldTemplateParams = OldDecl->getTemplateParameters(); 6567 else 6568 Invalid = true; 6569 6570 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6571 if (!Invalid && 6572 !Context.hasSameType(OldTD->getUnderlyingType(), 6573 NewTD->getUnderlyingType())) { 6574 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6575 // but we can't reasonably accept it. 6576 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6577 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6578 if (OldTD->getLocation().isValid()) 6579 Diag(OldTD->getLocation(), diag::note_previous_definition); 6580 Invalid = true; 6581 } 6582 } 6583 } 6584 6585 // Merge any previous default template arguments into our parameters, 6586 // and check the parameter list. 6587 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6588 TPC_TypeAliasTemplate)) 6589 return 0; 6590 6591 TypeAliasTemplateDecl *NewDecl = 6592 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6593 Name.Identifier, TemplateParams, 6594 NewTD); 6595 6596 NewDecl->setAccess(AS); 6597 6598 if (Invalid) 6599 NewDecl->setInvalidDecl(); 6600 else if (OldDecl) 6601 NewDecl->setPreviousDeclaration(OldDecl); 6602 6603 NewND = NewDecl; 6604 } else { 6605 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6606 NewND = NewTD; 6607 } 6608 6609 if (!Redeclaration) 6610 PushOnScopeChains(NewND, S); 6611 6612 return NewND; 6613} 6614 6615Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6616 SourceLocation NamespaceLoc, 6617 SourceLocation AliasLoc, 6618 IdentifierInfo *Alias, 6619 CXXScopeSpec &SS, 6620 SourceLocation IdentLoc, 6621 IdentifierInfo *Ident) { 6622 6623 // Lookup the namespace name. 6624 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6625 LookupParsedName(R, S, &SS); 6626 6627 // Check if we have a previous declaration with the same name. 6628 NamedDecl *PrevDecl 6629 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6630 ForRedeclaration); 6631 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6632 PrevDecl = 0; 6633 6634 if (PrevDecl) { 6635 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6636 // We already have an alias with the same name that points to the same 6637 // namespace, so don't create a new one. 6638 // FIXME: At some point, we'll want to create the (redundant) 6639 // declaration to maintain better source information. 6640 if (!R.isAmbiguous() && !R.empty() && 6641 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6642 return 0; 6643 } 6644 6645 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6646 diag::err_redefinition_different_kind; 6647 Diag(AliasLoc, DiagID) << Alias; 6648 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6649 return 0; 6650 } 6651 6652 if (R.isAmbiguous()) 6653 return 0; 6654 6655 if (R.empty()) { 6656 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6657 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6658 return 0; 6659 } 6660 } 6661 6662 NamespaceAliasDecl *AliasDecl = 6663 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6664 Alias, SS.getWithLocInContext(Context), 6665 IdentLoc, R.getFoundDecl()); 6666 6667 PushOnScopeChains(AliasDecl, S); 6668 return AliasDecl; 6669} 6670 6671namespace { 6672 /// \brief Scoped object used to handle the state changes required in Sema 6673 /// to implicitly define the body of a C++ member function; 6674 class ImplicitlyDefinedFunctionScope { 6675 Sema &S; 6676 Sema::ContextRAII SavedContext; 6677 6678 public: 6679 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6680 : S(S), SavedContext(S, Method) 6681 { 6682 S.PushFunctionScope(); 6683 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6684 } 6685 6686 ~ImplicitlyDefinedFunctionScope() { 6687 S.PopExpressionEvaluationContext(); 6688 S.PopFunctionOrBlockScope(); 6689 } 6690 }; 6691} 6692 6693Sema::ImplicitExceptionSpecification 6694Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6695 // C++ [except.spec]p14: 6696 // An implicitly declared special member function (Clause 12) shall have an 6697 // exception-specification. [...] 6698 ImplicitExceptionSpecification ExceptSpec(Context); 6699 if (ClassDecl->isInvalidDecl()) 6700 return ExceptSpec; 6701 6702 // Direct base-class constructors. 6703 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6704 BEnd = ClassDecl->bases_end(); 6705 B != BEnd; ++B) { 6706 if (B->isVirtual()) // Handled below. 6707 continue; 6708 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 // Virtual base-class constructors. 6720 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6721 BEnd = ClassDecl->vbases_end(); 6722 B != BEnd; ++B) { 6723 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6724 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6725 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6726 // If this is a deleted function, add it anyway. This might be conformant 6727 // with the standard. This might not. I'm not sure. It might not matter. 6728 if (Constructor) 6729 ExceptSpec.CalledDecl(Constructor); 6730 } 6731 } 6732 6733 // Field constructors. 6734 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6735 FEnd = ClassDecl->field_end(); 6736 F != FEnd; ++F) { 6737 if (F->hasInClassInitializer()) { 6738 if (Expr *E = F->getInClassInitializer()) 6739 ExceptSpec.CalledExpr(E); 6740 else if (!F->isInvalidDecl()) 6741 ExceptSpec.SetDelayed(); 6742 } else if (const RecordType *RecordTy 6743 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6744 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6745 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6746 // If this is a deleted function, add it anyway. This might be conformant 6747 // with the standard. This might not. I'm not sure. It might not matter. 6748 // In particular, the problem is that this function never gets called. It 6749 // might just be ill-formed because this function attempts to refer to 6750 // a deleted function here. 6751 if (Constructor) 6752 ExceptSpec.CalledDecl(Constructor); 6753 } 6754 } 6755 6756 return ExceptSpec; 6757} 6758 6759CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6760 CXXRecordDecl *ClassDecl) { 6761 // C++ [class.ctor]p5: 6762 // A default constructor for a class X is a constructor of class X 6763 // that can be called without an argument. If there is no 6764 // user-declared constructor for class X, a default constructor is 6765 // implicitly declared. An implicitly-declared default constructor 6766 // is an inline public member of its class. 6767 assert(!ClassDecl->hasUserDeclaredConstructor() && 6768 "Should not build implicit default constructor!"); 6769 6770 ImplicitExceptionSpecification Spec = 6771 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6772 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6773 6774 // Create the actual constructor declaration. 6775 CanQualType ClassType 6776 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6777 SourceLocation ClassLoc = ClassDecl->getLocation(); 6778 DeclarationName Name 6779 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6780 DeclarationNameInfo NameInfo(Name, ClassLoc); 6781 CXXConstructorDecl *DefaultCon 6782 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6783 Context.getFunctionType(Context.VoidTy, 6784 0, 0, EPI), 6785 /*TInfo=*/0, 6786 /*isExplicit=*/false, 6787 /*isInline=*/true, 6788 /*isImplicitlyDeclared=*/true, 6789 // FIXME: apply the rules for definitions here 6790 /*isConstexpr=*/false); 6791 DefaultCon->setAccess(AS_public); 6792 DefaultCon->setDefaulted(); 6793 DefaultCon->setImplicit(); 6794 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6795 6796 // Note that we have declared this constructor. 6797 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6798 6799 if (Scope *S = getScopeForContext(ClassDecl)) 6800 PushOnScopeChains(DefaultCon, S, false); 6801 ClassDecl->addDecl(DefaultCon); 6802 6803 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6804 DefaultCon->setDeletedAsWritten(); 6805 6806 return DefaultCon; 6807} 6808 6809void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6810 CXXConstructorDecl *Constructor) { 6811 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6812 !Constructor->doesThisDeclarationHaveABody() && 6813 !Constructor->isDeleted()) && 6814 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6815 6816 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6817 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6818 6819 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6820 DiagnosticErrorTrap Trap(Diags); 6821 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6822 Trap.hasErrorOccurred()) { 6823 Diag(CurrentLocation, diag::note_member_synthesized_at) 6824 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6825 Constructor->setInvalidDecl(); 6826 return; 6827 } 6828 6829 SourceLocation Loc = Constructor->getLocation(); 6830 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6831 6832 Constructor->setUsed(); 6833 MarkVTableUsed(CurrentLocation, ClassDecl); 6834 6835 if (ASTMutationListener *L = getASTMutationListener()) { 6836 L->CompletedImplicitDefinition(Constructor); 6837 } 6838} 6839 6840/// Get any existing defaulted default constructor for the given class. Do not 6841/// implicitly define one if it does not exist. 6842static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6843 CXXRecordDecl *D) { 6844 ASTContext &Context = Self.Context; 6845 QualType ClassType = Context.getTypeDeclType(D); 6846 DeclarationName ConstructorName 6847 = Context.DeclarationNames.getCXXConstructorName( 6848 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6849 6850 DeclContext::lookup_const_iterator Con, ConEnd; 6851 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6852 Con != ConEnd; ++Con) { 6853 // A function template cannot be defaulted. 6854 if (isa<FunctionTemplateDecl>(*Con)) 6855 continue; 6856 6857 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6858 if (Constructor->isDefaultConstructor()) 6859 return Constructor->isDefaulted() ? Constructor : 0; 6860 } 6861 return 0; 6862} 6863 6864void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6865 if (!D) return; 6866 AdjustDeclIfTemplate(D); 6867 6868 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6869 CXXConstructorDecl *CtorDecl 6870 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6871 6872 if (!CtorDecl) return; 6873 6874 // Compute the exception specification for the default constructor. 6875 const FunctionProtoType *CtorTy = 6876 CtorDecl->getType()->castAs<FunctionProtoType>(); 6877 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6878 ImplicitExceptionSpecification Spec = 6879 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6880 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6881 assert(EPI.ExceptionSpecType != EST_Delayed); 6882 6883 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6884 } 6885 6886 // If the default constructor is explicitly defaulted, checking the exception 6887 // specification is deferred until now. 6888 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6889 !ClassDecl->isDependentType()) 6890 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6891} 6892 6893void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6894 // We start with an initial pass over the base classes to collect those that 6895 // inherit constructors from. If there are none, we can forgo all further 6896 // processing. 6897 typedef SmallVector<const RecordType *, 4> BasesVector; 6898 BasesVector BasesToInheritFrom; 6899 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6900 BaseE = ClassDecl->bases_end(); 6901 BaseIt != BaseE; ++BaseIt) { 6902 if (BaseIt->getInheritConstructors()) { 6903 QualType Base = BaseIt->getType(); 6904 if (Base->isDependentType()) { 6905 // If we inherit constructors from anything that is dependent, just 6906 // abort processing altogether. We'll get another chance for the 6907 // instantiations. 6908 return; 6909 } 6910 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6911 } 6912 } 6913 if (BasesToInheritFrom.empty()) 6914 return; 6915 6916 // Now collect the constructors that we already have in the current class. 6917 // Those take precedence over inherited constructors. 6918 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6919 // unless there is a user-declared constructor with the same signature in 6920 // the class where the using-declaration appears. 6921 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6922 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6923 CtorE = ClassDecl->ctor_end(); 6924 CtorIt != CtorE; ++CtorIt) { 6925 ExistingConstructors.insert( 6926 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6927 } 6928 6929 Scope *S = getScopeForContext(ClassDecl); 6930 DeclarationName CreatedCtorName = 6931 Context.DeclarationNames.getCXXConstructorName( 6932 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6933 6934 // Now comes the true work. 6935 // First, we keep a map from constructor types to the base that introduced 6936 // them. Needed for finding conflicting constructors. We also keep the 6937 // actually inserted declarations in there, for pretty diagnostics. 6938 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6939 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6940 ConstructorToSourceMap InheritedConstructors; 6941 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6942 BaseE = BasesToInheritFrom.end(); 6943 BaseIt != BaseE; ++BaseIt) { 6944 const RecordType *Base = *BaseIt; 6945 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6946 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6947 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6948 CtorE = BaseDecl->ctor_end(); 6949 CtorIt != CtorE; ++CtorIt) { 6950 // Find the using declaration for inheriting this base's constructors. 6951 DeclarationName Name = 6952 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6953 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6954 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6955 SourceLocation UsingLoc = UD ? UD->getLocation() : 6956 ClassDecl->getLocation(); 6957 6958 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6959 // from the class X named in the using-declaration consists of actual 6960 // constructors and notional constructors that result from the 6961 // transformation of defaulted parameters as follows: 6962 // - all non-template default constructors of X, and 6963 // - for each non-template constructor of X that has at least one 6964 // parameter with a default argument, the set of constructors that 6965 // results from omitting any ellipsis parameter specification and 6966 // successively omitting parameters with a default argument from the 6967 // end of the parameter-type-list. 6968 CXXConstructorDecl *BaseCtor = *CtorIt; 6969 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6970 const FunctionProtoType *BaseCtorType = 6971 BaseCtor->getType()->getAs<FunctionProtoType>(); 6972 6973 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6974 maxParams = BaseCtor->getNumParams(); 6975 params <= maxParams; ++params) { 6976 // Skip default constructors. They're never inherited. 6977 if (params == 0) 6978 continue; 6979 // Skip copy and move constructors for the same reason. 6980 if (CanBeCopyOrMove && params == 1) 6981 continue; 6982 6983 // Build up a function type for this particular constructor. 6984 // FIXME: The working paper does not consider that the exception spec 6985 // for the inheriting constructor might be larger than that of the 6986 // source. This code doesn't yet, either. When it does, this code will 6987 // need to be delayed until after exception specifications and in-class 6988 // member initializers are attached. 6989 const Type *NewCtorType; 6990 if (params == maxParams) 6991 NewCtorType = BaseCtorType; 6992 else { 6993 SmallVector<QualType, 16> Args; 6994 for (unsigned i = 0; i < params; ++i) { 6995 Args.push_back(BaseCtorType->getArgType(i)); 6996 } 6997 FunctionProtoType::ExtProtoInfo ExtInfo = 6998 BaseCtorType->getExtProtoInfo(); 6999 ExtInfo.Variadic = false; 7000 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7001 Args.data(), params, ExtInfo) 7002 .getTypePtr(); 7003 } 7004 const Type *CanonicalNewCtorType = 7005 Context.getCanonicalType(NewCtorType); 7006 7007 // Now that we have the type, first check if the class already has a 7008 // constructor with this signature. 7009 if (ExistingConstructors.count(CanonicalNewCtorType)) 7010 continue; 7011 7012 // Then we check if we have already declared an inherited constructor 7013 // with this signature. 7014 std::pair<ConstructorToSourceMap::iterator, bool> result = 7015 InheritedConstructors.insert(std::make_pair( 7016 CanonicalNewCtorType, 7017 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7018 if (!result.second) { 7019 // Already in the map. If it came from a different class, that's an 7020 // error. Not if it's from the same. 7021 CanQualType PreviousBase = result.first->second.first; 7022 if (CanonicalBase != PreviousBase) { 7023 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7024 const CXXConstructorDecl *PrevBaseCtor = 7025 PrevCtor->getInheritedConstructor(); 7026 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7027 7028 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7029 Diag(BaseCtor->getLocation(), 7030 diag::note_using_decl_constructor_conflict_current_ctor); 7031 Diag(PrevBaseCtor->getLocation(), 7032 diag::note_using_decl_constructor_conflict_previous_ctor); 7033 Diag(PrevCtor->getLocation(), 7034 diag::note_using_decl_constructor_conflict_previous_using); 7035 } 7036 continue; 7037 } 7038 7039 // OK, we're there, now add the constructor. 7040 // C++0x [class.inhctor]p8: [...] that would be performed by a 7041 // user-written inline constructor [...] 7042 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7043 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7044 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7045 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7046 /*ImplicitlyDeclared=*/true, 7047 // FIXME: Due to a defect in the standard, we treat inherited 7048 // constructors as constexpr even if that makes them ill-formed. 7049 /*Constexpr=*/BaseCtor->isConstexpr()); 7050 NewCtor->setAccess(BaseCtor->getAccess()); 7051 7052 // Build up the parameter decls and add them. 7053 SmallVector<ParmVarDecl *, 16> ParamDecls; 7054 for (unsigned i = 0; i < params; ++i) { 7055 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7056 UsingLoc, UsingLoc, 7057 /*IdentifierInfo=*/0, 7058 BaseCtorType->getArgType(i), 7059 /*TInfo=*/0, SC_None, 7060 SC_None, /*DefaultArg=*/0)); 7061 } 7062 NewCtor->setParams(ParamDecls); 7063 NewCtor->setInheritedConstructor(BaseCtor); 7064 7065 PushOnScopeChains(NewCtor, S, false); 7066 ClassDecl->addDecl(NewCtor); 7067 result.first->second.second = NewCtor; 7068 } 7069 } 7070 } 7071} 7072 7073Sema::ImplicitExceptionSpecification 7074Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7075 // C++ [except.spec]p14: 7076 // An implicitly declared special member function (Clause 12) shall have 7077 // an exception-specification. 7078 ImplicitExceptionSpecification ExceptSpec(Context); 7079 if (ClassDecl->isInvalidDecl()) 7080 return ExceptSpec; 7081 7082 // Direct base-class destructors. 7083 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7084 BEnd = ClassDecl->bases_end(); 7085 B != BEnd; ++B) { 7086 if (B->isVirtual()) // Handled below. 7087 continue; 7088 7089 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7090 ExceptSpec.CalledDecl( 7091 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7092 } 7093 7094 // Virtual base-class destructors. 7095 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7096 BEnd = ClassDecl->vbases_end(); 7097 B != BEnd; ++B) { 7098 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7099 ExceptSpec.CalledDecl( 7100 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7101 } 7102 7103 // Field destructors. 7104 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7105 FEnd = ClassDecl->field_end(); 7106 F != FEnd; ++F) { 7107 if (const RecordType *RecordTy 7108 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7109 ExceptSpec.CalledDecl( 7110 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7111 } 7112 7113 return ExceptSpec; 7114} 7115 7116CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7117 // C++ [class.dtor]p2: 7118 // If a class has no user-declared destructor, a destructor is 7119 // declared implicitly. An implicitly-declared destructor is an 7120 // inline public member of its class. 7121 7122 ImplicitExceptionSpecification Spec = 7123 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7124 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7125 7126 // Create the actual destructor declaration. 7127 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7128 7129 CanQualType ClassType 7130 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7131 SourceLocation ClassLoc = ClassDecl->getLocation(); 7132 DeclarationName Name 7133 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7134 DeclarationNameInfo NameInfo(Name, ClassLoc); 7135 CXXDestructorDecl *Destructor 7136 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7137 /*isInline=*/true, 7138 /*isImplicitlyDeclared=*/true); 7139 Destructor->setAccess(AS_public); 7140 Destructor->setDefaulted(); 7141 Destructor->setImplicit(); 7142 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7143 7144 // Note that we have declared this destructor. 7145 ++ASTContext::NumImplicitDestructorsDeclared; 7146 7147 // Introduce this destructor into its scope. 7148 if (Scope *S = getScopeForContext(ClassDecl)) 7149 PushOnScopeChains(Destructor, S, false); 7150 ClassDecl->addDecl(Destructor); 7151 7152 // This could be uniqued if it ever proves significant. 7153 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7154 7155 if (ShouldDeleteDestructor(Destructor)) 7156 Destructor->setDeletedAsWritten(); 7157 7158 AddOverriddenMethods(ClassDecl, Destructor); 7159 7160 return Destructor; 7161} 7162 7163void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7164 CXXDestructorDecl *Destructor) { 7165 assert((Destructor->isDefaulted() && 7166 !Destructor->doesThisDeclarationHaveABody()) && 7167 "DefineImplicitDestructor - call it for implicit default dtor"); 7168 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7169 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7170 7171 if (Destructor->isInvalidDecl()) 7172 return; 7173 7174 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7175 7176 DiagnosticErrorTrap Trap(Diags); 7177 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7178 Destructor->getParent()); 7179 7180 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7181 Diag(CurrentLocation, diag::note_member_synthesized_at) 7182 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7183 7184 Destructor->setInvalidDecl(); 7185 return; 7186 } 7187 7188 SourceLocation Loc = Destructor->getLocation(); 7189 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7190 Destructor->setImplicitlyDefined(true); 7191 Destructor->setUsed(); 7192 MarkVTableUsed(CurrentLocation, ClassDecl); 7193 7194 if (ASTMutationListener *L = getASTMutationListener()) { 7195 L->CompletedImplicitDefinition(Destructor); 7196 } 7197} 7198 7199void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7200 CXXDestructorDecl *destructor) { 7201 // C++11 [class.dtor]p3: 7202 // A declaration of a destructor that does not have an exception- 7203 // specification is implicitly considered to have the same exception- 7204 // specification as an implicit declaration. 7205 const FunctionProtoType *dtorType = destructor->getType()-> 7206 getAs<FunctionProtoType>(); 7207 if (dtorType->hasExceptionSpec()) 7208 return; 7209 7210 ImplicitExceptionSpecification exceptSpec = 7211 ComputeDefaultedDtorExceptionSpec(classDecl); 7212 7213 // Replace the destructor's type, building off the existing one. Fortunately, 7214 // the only thing of interest in the destructor type is its extended info. 7215 // The return and arguments are fixed. 7216 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7217 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7218 epi.NumExceptions = exceptSpec.size(); 7219 epi.Exceptions = exceptSpec.data(); 7220 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7221 7222 destructor->setType(ty); 7223 7224 // FIXME: If the destructor has a body that could throw, and the newly created 7225 // spec doesn't allow exceptions, we should emit a warning, because this 7226 // change in behavior can break conforming C++03 programs at runtime. 7227 // However, we don't have a body yet, so it needs to be done somewhere else. 7228} 7229 7230/// \brief Builds a statement that copies/moves the given entity from \p From to 7231/// \c To. 7232/// 7233/// This routine is used to copy/move the members of a class with an 7234/// implicitly-declared copy/move assignment operator. When the entities being 7235/// copied are arrays, this routine builds for loops to copy them. 7236/// 7237/// \param S The Sema object used for type-checking. 7238/// 7239/// \param Loc The location where the implicit copy/move is being generated. 7240/// 7241/// \param T The type of the expressions being copied/moved. Both expressions 7242/// must have this type. 7243/// 7244/// \param To The expression we are copying/moving to. 7245/// 7246/// \param From The expression we are copying/moving from. 7247/// 7248/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7249/// Otherwise, it's a non-static member subobject. 7250/// 7251/// \param Copying Whether we're copying or moving. 7252/// 7253/// \param Depth Internal parameter recording the depth of the recursion. 7254/// 7255/// \returns A statement or a loop that copies the expressions. 7256static StmtResult 7257BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7258 Expr *To, Expr *From, 7259 bool CopyingBaseSubobject, bool Copying, 7260 unsigned Depth = 0) { 7261 // C++0x [class.copy]p28: 7262 // Each subobject is assigned in the manner appropriate to its type: 7263 // 7264 // - if the subobject is of class type, as if by a call to operator= with 7265 // the subobject as the object expression and the corresponding 7266 // subobject of x as a single function argument (as if by explicit 7267 // qualification; that is, ignoring any possible virtual overriding 7268 // functions in more derived classes); 7269 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7270 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7271 7272 // Look for operator=. 7273 DeclarationName Name 7274 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7275 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7276 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7277 7278 // Filter out any result that isn't a copy/move-assignment operator. 7279 LookupResult::Filter F = OpLookup.makeFilter(); 7280 while (F.hasNext()) { 7281 NamedDecl *D = F.next(); 7282 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7283 if (Copying ? Method->isCopyAssignmentOperator() : 7284 Method->isMoveAssignmentOperator()) 7285 continue; 7286 7287 F.erase(); 7288 } 7289 F.done(); 7290 7291 // Suppress the protected check (C++ [class.protected]) for each of the 7292 // assignment operators we found. This strange dance is required when 7293 // we're assigning via a base classes's copy-assignment operator. To 7294 // ensure that we're getting the right base class subobject (without 7295 // ambiguities), we need to cast "this" to that subobject type; to 7296 // ensure that we don't go through the virtual call mechanism, we need 7297 // to qualify the operator= name with the base class (see below). However, 7298 // this means that if the base class has a protected copy assignment 7299 // operator, the protected member access check will fail. So, we 7300 // rewrite "protected" access to "public" access in this case, since we 7301 // know by construction that we're calling from a derived class. 7302 if (CopyingBaseSubobject) { 7303 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7304 L != LEnd; ++L) { 7305 if (L.getAccess() == AS_protected) 7306 L.setAccess(AS_public); 7307 } 7308 } 7309 7310 // Create the nested-name-specifier that will be used to qualify the 7311 // reference to operator=; this is required to suppress the virtual 7312 // call mechanism. 7313 CXXScopeSpec SS; 7314 SS.MakeTrivial(S.Context, 7315 NestedNameSpecifier::Create(S.Context, 0, false, 7316 T.getTypePtr()), 7317 Loc); 7318 7319 // Create the reference to operator=. 7320 ExprResult OpEqualRef 7321 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7322 /*FirstQualifierInScope=*/0, OpLookup, 7323 /*TemplateArgs=*/0, 7324 /*SuppressQualifierCheck=*/true); 7325 if (OpEqualRef.isInvalid()) 7326 return StmtError(); 7327 7328 // Build the call to the assignment operator. 7329 7330 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7331 OpEqualRef.takeAs<Expr>(), 7332 Loc, &From, 1, Loc); 7333 if (Call.isInvalid()) 7334 return StmtError(); 7335 7336 return S.Owned(Call.takeAs<Stmt>()); 7337 } 7338 7339 // - if the subobject is of scalar type, the built-in assignment 7340 // operator is used. 7341 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7342 if (!ArrayTy) { 7343 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7344 if (Assignment.isInvalid()) 7345 return StmtError(); 7346 7347 return S.Owned(Assignment.takeAs<Stmt>()); 7348 } 7349 7350 // - if the subobject is an array, each element is assigned, in the 7351 // manner appropriate to the element type; 7352 7353 // Construct a loop over the array bounds, e.g., 7354 // 7355 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7356 // 7357 // that will copy each of the array elements. 7358 QualType SizeType = S.Context.getSizeType(); 7359 7360 // Create the iteration variable. 7361 IdentifierInfo *IterationVarName = 0; 7362 { 7363 llvm::SmallString<8> Str; 7364 llvm::raw_svector_ostream OS(Str); 7365 OS << "__i" << Depth; 7366 IterationVarName = &S.Context.Idents.get(OS.str()); 7367 } 7368 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7369 IterationVarName, SizeType, 7370 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7371 SC_None, SC_None); 7372 7373 // Initialize the iteration variable to zero. 7374 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7375 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7376 7377 // Create a reference to the iteration variable; we'll use this several 7378 // times throughout. 7379 Expr *IterationVarRef 7380 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7381 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7382 7383 // Create the DeclStmt that holds the iteration variable. 7384 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7385 7386 // Create the comparison against the array bound. 7387 llvm::APInt Upper 7388 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7389 Expr *Comparison 7390 = new (S.Context) BinaryOperator(IterationVarRef, 7391 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7392 BO_NE, S.Context.BoolTy, 7393 VK_RValue, OK_Ordinary, Loc); 7394 7395 // Create the pre-increment of the iteration variable. 7396 Expr *Increment 7397 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7398 VK_LValue, OK_Ordinary, Loc); 7399 7400 // Subscript the "from" and "to" expressions with the iteration variable. 7401 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7402 IterationVarRef, Loc)); 7403 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7404 IterationVarRef, Loc)); 7405 if (!Copying) // Cast to rvalue 7406 From = CastForMoving(S, From); 7407 7408 // Build the copy/move for an individual element of the array. 7409 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7410 To, From, CopyingBaseSubobject, 7411 Copying, Depth + 1); 7412 if (Copy.isInvalid()) 7413 return StmtError(); 7414 7415 // Construct the loop that copies all elements of this array. 7416 return S.ActOnForStmt(Loc, Loc, InitStmt, 7417 S.MakeFullExpr(Comparison), 7418 0, S.MakeFullExpr(Increment), 7419 Loc, Copy.take()); 7420} 7421 7422std::pair<Sema::ImplicitExceptionSpecification, bool> 7423Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7424 CXXRecordDecl *ClassDecl) { 7425 if (ClassDecl->isInvalidDecl()) 7426 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7427 7428 // C++ [class.copy]p10: 7429 // If the class definition does not explicitly declare a copy 7430 // assignment operator, one is declared implicitly. 7431 // The implicitly-defined copy assignment operator for a class X 7432 // will have the form 7433 // 7434 // X& X::operator=(const X&) 7435 // 7436 // if 7437 bool HasConstCopyAssignment = true; 7438 7439 // -- each direct base class B of X has a copy assignment operator 7440 // whose parameter is of type const B&, const volatile B& or B, 7441 // and 7442 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7443 BaseEnd = ClassDecl->bases_end(); 7444 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7445 // We'll handle this below 7446 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7447 continue; 7448 7449 assert(!Base->getType()->isDependentType() && 7450 "Cannot generate implicit members for class with dependent bases."); 7451 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7452 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7453 &HasConstCopyAssignment); 7454 } 7455 7456 // In C++11, the above citation has "or virtual" added 7457 if (LangOpts.CPlusPlus0x) { 7458 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7459 BaseEnd = ClassDecl->vbases_end(); 7460 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7461 assert(!Base->getType()->isDependentType() && 7462 "Cannot generate implicit members for class with dependent bases."); 7463 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7464 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7465 &HasConstCopyAssignment); 7466 } 7467 } 7468 7469 // -- for all the nonstatic data members of X that are of a class 7470 // type M (or array thereof), each such class type has a copy 7471 // assignment operator whose parameter is of type const M&, 7472 // const volatile M& or M. 7473 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7474 FieldEnd = ClassDecl->field_end(); 7475 HasConstCopyAssignment && Field != FieldEnd; 7476 ++Field) { 7477 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7478 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7479 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7480 &HasConstCopyAssignment); 7481 } 7482 } 7483 7484 // Otherwise, the implicitly declared copy assignment operator will 7485 // have the form 7486 // 7487 // X& X::operator=(X&) 7488 7489 // C++ [except.spec]p14: 7490 // An implicitly declared special member function (Clause 12) shall have an 7491 // exception-specification. [...] 7492 7493 // It is unspecified whether or not an implicit copy assignment operator 7494 // attempts to deduplicate calls to assignment operators of virtual bases are 7495 // made. As such, this exception specification is effectively unspecified. 7496 // Based on a similar decision made for constness in C++0x, we're erring on 7497 // the side of assuming such calls to be made regardless of whether they 7498 // actually happen. 7499 ImplicitExceptionSpecification ExceptSpec(Context); 7500 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7501 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7502 BaseEnd = ClassDecl->bases_end(); 7503 Base != BaseEnd; ++Base) { 7504 if (Base->isVirtual()) 7505 continue; 7506 7507 CXXRecordDecl *BaseClassDecl 7508 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7509 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7510 ArgQuals, false, 0)) 7511 ExceptSpec.CalledDecl(CopyAssign); 7512 } 7513 7514 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7515 BaseEnd = ClassDecl->vbases_end(); 7516 Base != BaseEnd; ++Base) { 7517 CXXRecordDecl *BaseClassDecl 7518 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7519 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7520 ArgQuals, false, 0)) 7521 ExceptSpec.CalledDecl(CopyAssign); 7522 } 7523 7524 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7525 FieldEnd = ClassDecl->field_end(); 7526 Field != FieldEnd; 7527 ++Field) { 7528 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7529 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7530 if (CXXMethodDecl *CopyAssign = 7531 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7532 ExceptSpec.CalledDecl(CopyAssign); 7533 } 7534 } 7535 7536 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7537} 7538 7539CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7540 // Note: The following rules are largely analoguous to the copy 7541 // constructor rules. Note that virtual bases are not taken into account 7542 // for determining the argument type of the operator. Note also that 7543 // operators taking an object instead of a reference are allowed. 7544 7545 ImplicitExceptionSpecification Spec(Context); 7546 bool Const; 7547 llvm::tie(Spec, Const) = 7548 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7549 7550 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7551 QualType RetType = Context.getLValueReferenceType(ArgType); 7552 if (Const) 7553 ArgType = ArgType.withConst(); 7554 ArgType = Context.getLValueReferenceType(ArgType); 7555 7556 // An implicitly-declared copy assignment operator is an inline public 7557 // member of its class. 7558 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7559 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7560 SourceLocation ClassLoc = ClassDecl->getLocation(); 7561 DeclarationNameInfo NameInfo(Name, ClassLoc); 7562 CXXMethodDecl *CopyAssignment 7563 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7564 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7565 /*TInfo=*/0, /*isStatic=*/false, 7566 /*StorageClassAsWritten=*/SC_None, 7567 /*isInline=*/true, /*isConstexpr=*/false, 7568 SourceLocation()); 7569 CopyAssignment->setAccess(AS_public); 7570 CopyAssignment->setDefaulted(); 7571 CopyAssignment->setImplicit(); 7572 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7573 7574 // Add the parameter to the operator. 7575 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7576 ClassLoc, ClassLoc, /*Id=*/0, 7577 ArgType, /*TInfo=*/0, 7578 SC_None, 7579 SC_None, 0); 7580 CopyAssignment->setParams(FromParam); 7581 7582 // Note that we have added this copy-assignment operator. 7583 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7584 7585 if (Scope *S = getScopeForContext(ClassDecl)) 7586 PushOnScopeChains(CopyAssignment, S, false); 7587 ClassDecl->addDecl(CopyAssignment); 7588 7589 // C++0x [class.copy]p18: 7590 // ... If the class definition declares a move constructor or move 7591 // assignment operator, the implicitly declared copy assignment operator is 7592 // defined as deleted; ... 7593 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7594 ClassDecl->hasUserDeclaredMoveAssignment() || 7595 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7596 CopyAssignment->setDeletedAsWritten(); 7597 7598 AddOverriddenMethods(ClassDecl, CopyAssignment); 7599 return CopyAssignment; 7600} 7601 7602void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7603 CXXMethodDecl *CopyAssignOperator) { 7604 assert((CopyAssignOperator->isDefaulted() && 7605 CopyAssignOperator->isOverloadedOperator() && 7606 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7607 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7608 "DefineImplicitCopyAssignment called for wrong function"); 7609 7610 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7611 7612 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7613 CopyAssignOperator->setInvalidDecl(); 7614 return; 7615 } 7616 7617 CopyAssignOperator->setUsed(); 7618 7619 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7620 DiagnosticErrorTrap Trap(Diags); 7621 7622 // C++0x [class.copy]p30: 7623 // The implicitly-defined or explicitly-defaulted copy assignment operator 7624 // for a non-union class X performs memberwise copy assignment of its 7625 // subobjects. The direct base classes of X are assigned first, in the 7626 // order of their declaration in the base-specifier-list, and then the 7627 // immediate non-static data members of X are assigned, in the order in 7628 // which they were declared in the class definition. 7629 7630 // The statements that form the synthesized function body. 7631 ASTOwningVector<Stmt*> Statements(*this); 7632 7633 // The parameter for the "other" object, which we are copying from. 7634 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7635 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7636 QualType OtherRefType = Other->getType(); 7637 if (const LValueReferenceType *OtherRef 7638 = OtherRefType->getAs<LValueReferenceType>()) { 7639 OtherRefType = OtherRef->getPointeeType(); 7640 OtherQuals = OtherRefType.getQualifiers(); 7641 } 7642 7643 // Our location for everything implicitly-generated. 7644 SourceLocation Loc = CopyAssignOperator->getLocation(); 7645 7646 // Construct a reference to the "other" object. We'll be using this 7647 // throughout the generated ASTs. 7648 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7649 assert(OtherRef && "Reference to parameter cannot fail!"); 7650 7651 // Construct the "this" pointer. We'll be using this throughout the generated 7652 // ASTs. 7653 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7654 assert(This && "Reference to this cannot fail!"); 7655 7656 // Assign base classes. 7657 bool Invalid = false; 7658 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7659 E = ClassDecl->bases_end(); Base != E; ++Base) { 7660 // Form the assignment: 7661 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7662 QualType BaseType = Base->getType().getUnqualifiedType(); 7663 if (!BaseType->isRecordType()) { 7664 Invalid = true; 7665 continue; 7666 } 7667 7668 CXXCastPath BasePath; 7669 BasePath.push_back(Base); 7670 7671 // Construct the "from" expression, which is an implicit cast to the 7672 // appropriately-qualified base type. 7673 Expr *From = OtherRef; 7674 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7675 CK_UncheckedDerivedToBase, 7676 VK_LValue, &BasePath).take(); 7677 7678 // Dereference "this". 7679 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7680 7681 // Implicitly cast "this" to the appropriately-qualified base type. 7682 To = ImpCastExprToType(To.take(), 7683 Context.getCVRQualifiedType(BaseType, 7684 CopyAssignOperator->getTypeQualifiers()), 7685 CK_UncheckedDerivedToBase, 7686 VK_LValue, &BasePath); 7687 7688 // Build the copy. 7689 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7690 To.get(), From, 7691 /*CopyingBaseSubobject=*/true, 7692 /*Copying=*/true); 7693 if (Copy.isInvalid()) { 7694 Diag(CurrentLocation, diag::note_member_synthesized_at) 7695 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7696 CopyAssignOperator->setInvalidDecl(); 7697 return; 7698 } 7699 7700 // Success! Record the copy. 7701 Statements.push_back(Copy.takeAs<Expr>()); 7702 } 7703 7704 // \brief Reference to the __builtin_memcpy function. 7705 Expr *BuiltinMemCpyRef = 0; 7706 // \brief Reference to the __builtin_objc_memmove_collectable function. 7707 Expr *CollectableMemCpyRef = 0; 7708 7709 // Assign non-static members. 7710 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7711 FieldEnd = ClassDecl->field_end(); 7712 Field != FieldEnd; ++Field) { 7713 if (Field->isUnnamedBitfield()) 7714 continue; 7715 7716 // Check for members of reference type; we can't copy those. 7717 if (Field->getType()->isReferenceType()) { 7718 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7719 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7720 Diag(Field->getLocation(), diag::note_declared_at); 7721 Diag(CurrentLocation, diag::note_member_synthesized_at) 7722 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7723 Invalid = true; 7724 continue; 7725 } 7726 7727 // Check for members of const-qualified, non-class type. 7728 QualType BaseType = Context.getBaseElementType(Field->getType()); 7729 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7730 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7731 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7732 Diag(Field->getLocation(), diag::note_declared_at); 7733 Diag(CurrentLocation, diag::note_member_synthesized_at) 7734 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7735 Invalid = true; 7736 continue; 7737 } 7738 7739 // Suppress assigning zero-width bitfields. 7740 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7741 continue; 7742 7743 QualType FieldType = Field->getType().getNonReferenceType(); 7744 if (FieldType->isIncompleteArrayType()) { 7745 assert(ClassDecl->hasFlexibleArrayMember() && 7746 "Incomplete array type is not valid"); 7747 continue; 7748 } 7749 7750 // Build references to the field in the object we're copying from and to. 7751 CXXScopeSpec SS; // Intentionally empty 7752 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7753 LookupMemberName); 7754 MemberLookup.addDecl(*Field); 7755 MemberLookup.resolveKind(); 7756 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7757 Loc, /*IsArrow=*/false, 7758 SS, 0, MemberLookup, 0); 7759 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7760 Loc, /*IsArrow=*/true, 7761 SS, 0, MemberLookup, 0); 7762 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7763 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7764 7765 // If the field should be copied with __builtin_memcpy rather than via 7766 // explicit assignments, do so. This optimization only applies for arrays 7767 // of scalars and arrays of class type with trivial copy-assignment 7768 // operators. 7769 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7770 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7771 // Compute the size of the memory buffer to be copied. 7772 QualType SizeType = Context.getSizeType(); 7773 llvm::APInt Size(Context.getTypeSize(SizeType), 7774 Context.getTypeSizeInChars(BaseType).getQuantity()); 7775 for (const ConstantArrayType *Array 7776 = Context.getAsConstantArrayType(FieldType); 7777 Array; 7778 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7779 llvm::APInt ArraySize 7780 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7781 Size *= ArraySize; 7782 } 7783 7784 // Take the address of the field references for "from" and "to". 7785 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7786 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7787 7788 bool NeedsCollectableMemCpy = 7789 (BaseType->isRecordType() && 7790 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7791 7792 if (NeedsCollectableMemCpy) { 7793 if (!CollectableMemCpyRef) { 7794 // Create a reference to the __builtin_objc_memmove_collectable function. 7795 LookupResult R(*this, 7796 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7797 Loc, LookupOrdinaryName); 7798 LookupName(R, TUScope, true); 7799 7800 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7801 if (!CollectableMemCpy) { 7802 // Something went horribly wrong earlier, and we will have 7803 // complained about it. 7804 Invalid = true; 7805 continue; 7806 } 7807 7808 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7809 CollectableMemCpy->getType(), 7810 VK_LValue, Loc, 0).take(); 7811 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7812 } 7813 } 7814 // Create a reference to the __builtin_memcpy builtin function. 7815 else if (!BuiltinMemCpyRef) { 7816 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7817 LookupOrdinaryName); 7818 LookupName(R, TUScope, true); 7819 7820 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7821 if (!BuiltinMemCpy) { 7822 // Something went horribly wrong earlier, and we will have complained 7823 // about it. 7824 Invalid = true; 7825 continue; 7826 } 7827 7828 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7829 BuiltinMemCpy->getType(), 7830 VK_LValue, Loc, 0).take(); 7831 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7832 } 7833 7834 ASTOwningVector<Expr*> CallArgs(*this); 7835 CallArgs.push_back(To.takeAs<Expr>()); 7836 CallArgs.push_back(From.takeAs<Expr>()); 7837 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7838 ExprResult Call = ExprError(); 7839 if (NeedsCollectableMemCpy) 7840 Call = ActOnCallExpr(/*Scope=*/0, 7841 CollectableMemCpyRef, 7842 Loc, move_arg(CallArgs), 7843 Loc); 7844 else 7845 Call = ActOnCallExpr(/*Scope=*/0, 7846 BuiltinMemCpyRef, 7847 Loc, move_arg(CallArgs), 7848 Loc); 7849 7850 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7851 Statements.push_back(Call.takeAs<Expr>()); 7852 continue; 7853 } 7854 7855 // Build the copy of this field. 7856 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7857 To.get(), From.get(), 7858 /*CopyingBaseSubobject=*/false, 7859 /*Copying=*/true); 7860 if (Copy.isInvalid()) { 7861 Diag(CurrentLocation, diag::note_member_synthesized_at) 7862 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7863 CopyAssignOperator->setInvalidDecl(); 7864 return; 7865 } 7866 7867 // Success! Record the copy. 7868 Statements.push_back(Copy.takeAs<Stmt>()); 7869 } 7870 7871 if (!Invalid) { 7872 // Add a "return *this;" 7873 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7874 7875 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7876 if (Return.isInvalid()) 7877 Invalid = true; 7878 else { 7879 Statements.push_back(Return.takeAs<Stmt>()); 7880 7881 if (Trap.hasErrorOccurred()) { 7882 Diag(CurrentLocation, diag::note_member_synthesized_at) 7883 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7884 Invalid = true; 7885 } 7886 } 7887 } 7888 7889 if (Invalid) { 7890 CopyAssignOperator->setInvalidDecl(); 7891 return; 7892 } 7893 7894 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7895 /*isStmtExpr=*/false); 7896 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7897 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7898 7899 if (ASTMutationListener *L = getASTMutationListener()) { 7900 L->CompletedImplicitDefinition(CopyAssignOperator); 7901 } 7902} 7903 7904Sema::ImplicitExceptionSpecification 7905Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7906 ImplicitExceptionSpecification ExceptSpec(Context); 7907 7908 if (ClassDecl->isInvalidDecl()) 7909 return ExceptSpec; 7910 7911 // C++0x [except.spec]p14: 7912 // An implicitly declared special member function (Clause 12) shall have an 7913 // exception-specification. [...] 7914 7915 // It is unspecified whether or not an implicit move assignment operator 7916 // attempts to deduplicate calls to assignment operators of virtual bases are 7917 // made. As such, this exception specification is effectively unspecified. 7918 // Based on a similar decision made for constness in C++0x, we're erring on 7919 // the side of assuming such calls to be made regardless of whether they 7920 // actually happen. 7921 // Note that a move constructor is not implicitly declared when there are 7922 // virtual bases, but it can still be user-declared and explicitly defaulted. 7923 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7924 BaseEnd = ClassDecl->bases_end(); 7925 Base != BaseEnd; ++Base) { 7926 if (Base->isVirtual()) 7927 continue; 7928 7929 CXXRecordDecl *BaseClassDecl 7930 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7931 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7932 false, 0)) 7933 ExceptSpec.CalledDecl(MoveAssign); 7934 } 7935 7936 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7937 BaseEnd = ClassDecl->vbases_end(); 7938 Base != BaseEnd; ++Base) { 7939 CXXRecordDecl *BaseClassDecl 7940 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7941 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7942 false, 0)) 7943 ExceptSpec.CalledDecl(MoveAssign); 7944 } 7945 7946 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7947 FieldEnd = ClassDecl->field_end(); 7948 Field != FieldEnd; 7949 ++Field) { 7950 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7951 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7952 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7953 false, 0)) 7954 ExceptSpec.CalledDecl(MoveAssign); 7955 } 7956 } 7957 7958 return ExceptSpec; 7959} 7960 7961CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7962 // Note: The following rules are largely analoguous to the move 7963 // constructor rules. 7964 7965 ImplicitExceptionSpecification Spec( 7966 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7967 7968 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7969 QualType RetType = Context.getLValueReferenceType(ArgType); 7970 ArgType = Context.getRValueReferenceType(ArgType); 7971 7972 // An implicitly-declared move assignment operator is an inline public 7973 // member of its class. 7974 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7975 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7976 SourceLocation ClassLoc = ClassDecl->getLocation(); 7977 DeclarationNameInfo NameInfo(Name, ClassLoc); 7978 CXXMethodDecl *MoveAssignment 7979 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7980 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7981 /*TInfo=*/0, /*isStatic=*/false, 7982 /*StorageClassAsWritten=*/SC_None, 7983 /*isInline=*/true, 7984 /*isConstexpr=*/false, 7985 SourceLocation()); 7986 MoveAssignment->setAccess(AS_public); 7987 MoveAssignment->setDefaulted(); 7988 MoveAssignment->setImplicit(); 7989 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7990 7991 // Add the parameter to the operator. 7992 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7993 ClassLoc, ClassLoc, /*Id=*/0, 7994 ArgType, /*TInfo=*/0, 7995 SC_None, 7996 SC_None, 0); 7997 MoveAssignment->setParams(FromParam); 7998 7999 // Note that we have added this copy-assignment operator. 8000 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8001 8002 // C++0x [class.copy]p9: 8003 // If the definition of a class X does not explicitly declare a move 8004 // assignment operator, one will be implicitly declared as defaulted if and 8005 // only if: 8006 // [...] 8007 // - the move assignment operator would not be implicitly defined as 8008 // deleted. 8009 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8010 // Cache this result so that we don't try to generate this over and over 8011 // on every lookup, leaking memory and wasting time. 8012 ClassDecl->setFailedImplicitMoveAssignment(); 8013 return 0; 8014 } 8015 8016 if (Scope *S = getScopeForContext(ClassDecl)) 8017 PushOnScopeChains(MoveAssignment, S, false); 8018 ClassDecl->addDecl(MoveAssignment); 8019 8020 AddOverriddenMethods(ClassDecl, MoveAssignment); 8021 return MoveAssignment; 8022} 8023 8024void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8025 CXXMethodDecl *MoveAssignOperator) { 8026 assert((MoveAssignOperator->isDefaulted() && 8027 MoveAssignOperator->isOverloadedOperator() && 8028 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8029 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8030 "DefineImplicitMoveAssignment called for wrong function"); 8031 8032 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8033 8034 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8035 MoveAssignOperator->setInvalidDecl(); 8036 return; 8037 } 8038 8039 MoveAssignOperator->setUsed(); 8040 8041 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8042 DiagnosticErrorTrap Trap(Diags); 8043 8044 // C++0x [class.copy]p28: 8045 // The implicitly-defined or move assignment operator for a non-union class 8046 // X performs memberwise move assignment of its subobjects. The direct base 8047 // classes of X are assigned first, in the order of their declaration in the 8048 // base-specifier-list, and then the immediate non-static data members of X 8049 // are assigned, in the order in which they were declared in the class 8050 // definition. 8051 8052 // The statements that form the synthesized function body. 8053 ASTOwningVector<Stmt*> Statements(*this); 8054 8055 // The parameter for the "other" object, which we are move from. 8056 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8057 QualType OtherRefType = Other->getType()-> 8058 getAs<RValueReferenceType>()->getPointeeType(); 8059 assert(OtherRefType.getQualifiers() == 0 && 8060 "Bad argument type of defaulted move assignment"); 8061 8062 // Our location for everything implicitly-generated. 8063 SourceLocation Loc = MoveAssignOperator->getLocation(); 8064 8065 // Construct a reference to the "other" object. We'll be using this 8066 // throughout the generated ASTs. 8067 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8068 assert(OtherRef && "Reference to parameter cannot fail!"); 8069 // Cast to rvalue. 8070 OtherRef = CastForMoving(*this, OtherRef); 8071 8072 // Construct the "this" pointer. We'll be using this throughout the generated 8073 // ASTs. 8074 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8075 assert(This && "Reference to this cannot fail!"); 8076 8077 // Assign base classes. 8078 bool Invalid = false; 8079 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8080 E = ClassDecl->bases_end(); Base != E; ++Base) { 8081 // Form the assignment: 8082 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8083 QualType BaseType = Base->getType().getUnqualifiedType(); 8084 if (!BaseType->isRecordType()) { 8085 Invalid = true; 8086 continue; 8087 } 8088 8089 CXXCastPath BasePath; 8090 BasePath.push_back(Base); 8091 8092 // Construct the "from" expression, which is an implicit cast to the 8093 // appropriately-qualified base type. 8094 Expr *From = OtherRef; 8095 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8096 VK_XValue, &BasePath).take(); 8097 8098 // Dereference "this". 8099 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8100 8101 // Implicitly cast "this" to the appropriately-qualified base type. 8102 To = ImpCastExprToType(To.take(), 8103 Context.getCVRQualifiedType(BaseType, 8104 MoveAssignOperator->getTypeQualifiers()), 8105 CK_UncheckedDerivedToBase, 8106 VK_LValue, &BasePath); 8107 8108 // Build the move. 8109 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8110 To.get(), From, 8111 /*CopyingBaseSubobject=*/true, 8112 /*Copying=*/false); 8113 if (Move.isInvalid()) { 8114 Diag(CurrentLocation, diag::note_member_synthesized_at) 8115 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8116 MoveAssignOperator->setInvalidDecl(); 8117 return; 8118 } 8119 8120 // Success! Record the move. 8121 Statements.push_back(Move.takeAs<Expr>()); 8122 } 8123 8124 // \brief Reference to the __builtin_memcpy function. 8125 Expr *BuiltinMemCpyRef = 0; 8126 // \brief Reference to the __builtin_objc_memmove_collectable function. 8127 Expr *CollectableMemCpyRef = 0; 8128 8129 // Assign non-static members. 8130 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8131 FieldEnd = ClassDecl->field_end(); 8132 Field != FieldEnd; ++Field) { 8133 if (Field->isUnnamedBitfield()) 8134 continue; 8135 8136 // Check for members of reference type; we can't move those. 8137 if (Field->getType()->isReferenceType()) { 8138 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8139 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8140 Diag(Field->getLocation(), diag::note_declared_at); 8141 Diag(CurrentLocation, diag::note_member_synthesized_at) 8142 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8143 Invalid = true; 8144 continue; 8145 } 8146 8147 // Check for members of const-qualified, non-class type. 8148 QualType BaseType = Context.getBaseElementType(Field->getType()); 8149 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8150 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8151 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8152 Diag(Field->getLocation(), diag::note_declared_at); 8153 Diag(CurrentLocation, diag::note_member_synthesized_at) 8154 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8155 Invalid = true; 8156 continue; 8157 } 8158 8159 // Suppress assigning zero-width bitfields. 8160 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8161 continue; 8162 8163 QualType FieldType = Field->getType().getNonReferenceType(); 8164 if (FieldType->isIncompleteArrayType()) { 8165 assert(ClassDecl->hasFlexibleArrayMember() && 8166 "Incomplete array type is not valid"); 8167 continue; 8168 } 8169 8170 // Build references to the field in the object we're copying from and to. 8171 CXXScopeSpec SS; // Intentionally empty 8172 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8173 LookupMemberName); 8174 MemberLookup.addDecl(*Field); 8175 MemberLookup.resolveKind(); 8176 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8177 Loc, /*IsArrow=*/false, 8178 SS, 0, MemberLookup, 0); 8179 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8180 Loc, /*IsArrow=*/true, 8181 SS, 0, MemberLookup, 0); 8182 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8183 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8184 8185 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8186 "Member reference with rvalue base must be rvalue except for reference " 8187 "members, which aren't allowed for move assignment."); 8188 8189 // If the field should be copied with __builtin_memcpy rather than via 8190 // explicit assignments, do so. This optimization only applies for arrays 8191 // of scalars and arrays of class type with trivial move-assignment 8192 // operators. 8193 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8194 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8195 // Compute the size of the memory buffer to be copied. 8196 QualType SizeType = Context.getSizeType(); 8197 llvm::APInt Size(Context.getTypeSize(SizeType), 8198 Context.getTypeSizeInChars(BaseType).getQuantity()); 8199 for (const ConstantArrayType *Array 8200 = Context.getAsConstantArrayType(FieldType); 8201 Array; 8202 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8203 llvm::APInt ArraySize 8204 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8205 Size *= ArraySize; 8206 } 8207 8208 // Take the address of the field references for "from" and "to". We 8209 // directly construct UnaryOperators here because semantic analysis 8210 // does not permit us to take the address of an xvalue. 8211 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8212 Context.getPointerType(From.get()->getType()), 8213 VK_RValue, OK_Ordinary, Loc); 8214 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8215 Context.getPointerType(To.get()->getType()), 8216 VK_RValue, OK_Ordinary, Loc); 8217 8218 bool NeedsCollectableMemCpy = 8219 (BaseType->isRecordType() && 8220 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8221 8222 if (NeedsCollectableMemCpy) { 8223 if (!CollectableMemCpyRef) { 8224 // Create a reference to the __builtin_objc_memmove_collectable function. 8225 LookupResult R(*this, 8226 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8227 Loc, LookupOrdinaryName); 8228 LookupName(R, TUScope, true); 8229 8230 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8231 if (!CollectableMemCpy) { 8232 // Something went horribly wrong earlier, and we will have 8233 // complained about it. 8234 Invalid = true; 8235 continue; 8236 } 8237 8238 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8239 CollectableMemCpy->getType(), 8240 VK_LValue, Loc, 0).take(); 8241 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8242 } 8243 } 8244 // Create a reference to the __builtin_memcpy builtin function. 8245 else if (!BuiltinMemCpyRef) { 8246 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8247 LookupOrdinaryName); 8248 LookupName(R, TUScope, true); 8249 8250 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8251 if (!BuiltinMemCpy) { 8252 // Something went horribly wrong earlier, and we will have complained 8253 // about it. 8254 Invalid = true; 8255 continue; 8256 } 8257 8258 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8259 BuiltinMemCpy->getType(), 8260 VK_LValue, Loc, 0).take(); 8261 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8262 } 8263 8264 ASTOwningVector<Expr*> CallArgs(*this); 8265 CallArgs.push_back(To.takeAs<Expr>()); 8266 CallArgs.push_back(From.takeAs<Expr>()); 8267 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8268 ExprResult Call = ExprError(); 8269 if (NeedsCollectableMemCpy) 8270 Call = ActOnCallExpr(/*Scope=*/0, 8271 CollectableMemCpyRef, 8272 Loc, move_arg(CallArgs), 8273 Loc); 8274 else 8275 Call = ActOnCallExpr(/*Scope=*/0, 8276 BuiltinMemCpyRef, 8277 Loc, move_arg(CallArgs), 8278 Loc); 8279 8280 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8281 Statements.push_back(Call.takeAs<Expr>()); 8282 continue; 8283 } 8284 8285 // Build the move of this field. 8286 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8287 To.get(), From.get(), 8288 /*CopyingBaseSubobject=*/false, 8289 /*Copying=*/false); 8290 if (Move.isInvalid()) { 8291 Diag(CurrentLocation, diag::note_member_synthesized_at) 8292 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8293 MoveAssignOperator->setInvalidDecl(); 8294 return; 8295 } 8296 8297 // Success! Record the copy. 8298 Statements.push_back(Move.takeAs<Stmt>()); 8299 } 8300 8301 if (!Invalid) { 8302 // Add a "return *this;" 8303 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8304 8305 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8306 if (Return.isInvalid()) 8307 Invalid = true; 8308 else { 8309 Statements.push_back(Return.takeAs<Stmt>()); 8310 8311 if (Trap.hasErrorOccurred()) { 8312 Diag(CurrentLocation, diag::note_member_synthesized_at) 8313 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8314 Invalid = true; 8315 } 8316 } 8317 } 8318 8319 if (Invalid) { 8320 MoveAssignOperator->setInvalidDecl(); 8321 return; 8322 } 8323 8324 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8325 /*isStmtExpr=*/false); 8326 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8327 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8328 8329 if (ASTMutationListener *L = getASTMutationListener()) { 8330 L->CompletedImplicitDefinition(MoveAssignOperator); 8331 } 8332} 8333 8334std::pair<Sema::ImplicitExceptionSpecification, bool> 8335Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8336 if (ClassDecl->isInvalidDecl()) 8337 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8338 8339 // C++ [class.copy]p5: 8340 // The implicitly-declared copy constructor for a class X will 8341 // have the form 8342 // 8343 // X::X(const X&) 8344 // 8345 // if 8346 // FIXME: It ought to be possible to store this on the record. 8347 bool HasConstCopyConstructor = true; 8348 8349 // -- each direct or virtual base class B of X has a copy 8350 // constructor whose first parameter is of type const B& or 8351 // const volatile B&, and 8352 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8353 BaseEnd = ClassDecl->bases_end(); 8354 HasConstCopyConstructor && Base != BaseEnd; 8355 ++Base) { 8356 // Virtual bases are handled below. 8357 if (Base->isVirtual()) 8358 continue; 8359 8360 CXXRecordDecl *BaseClassDecl 8361 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8362 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8363 &HasConstCopyConstructor); 8364 } 8365 8366 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8367 BaseEnd = ClassDecl->vbases_end(); 8368 HasConstCopyConstructor && Base != BaseEnd; 8369 ++Base) { 8370 CXXRecordDecl *BaseClassDecl 8371 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8372 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8373 &HasConstCopyConstructor); 8374 } 8375 8376 // -- for all the nonstatic data members of X that are of a 8377 // class type M (or array thereof), each such class type 8378 // has a copy constructor whose first parameter is of type 8379 // const M& or const volatile M&. 8380 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8381 FieldEnd = ClassDecl->field_end(); 8382 HasConstCopyConstructor && Field != FieldEnd; 8383 ++Field) { 8384 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8385 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8386 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8387 &HasConstCopyConstructor); 8388 } 8389 } 8390 // Otherwise, the implicitly declared copy constructor will have 8391 // the form 8392 // 8393 // X::X(X&) 8394 8395 // C++ [except.spec]p14: 8396 // An implicitly declared special member function (Clause 12) shall have an 8397 // exception-specification. [...] 8398 ImplicitExceptionSpecification ExceptSpec(Context); 8399 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8400 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8401 BaseEnd = ClassDecl->bases_end(); 8402 Base != BaseEnd; 8403 ++Base) { 8404 // Virtual bases are handled below. 8405 if (Base->isVirtual()) 8406 continue; 8407 8408 CXXRecordDecl *BaseClassDecl 8409 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8410 if (CXXConstructorDecl *CopyConstructor = 8411 LookupCopyingConstructor(BaseClassDecl, Quals)) 8412 ExceptSpec.CalledDecl(CopyConstructor); 8413 } 8414 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8415 BaseEnd = ClassDecl->vbases_end(); 8416 Base != BaseEnd; 8417 ++Base) { 8418 CXXRecordDecl *BaseClassDecl 8419 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8420 if (CXXConstructorDecl *CopyConstructor = 8421 LookupCopyingConstructor(BaseClassDecl, Quals)) 8422 ExceptSpec.CalledDecl(CopyConstructor); 8423 } 8424 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8425 FieldEnd = ClassDecl->field_end(); 8426 Field != FieldEnd; 8427 ++Field) { 8428 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8429 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8430 if (CXXConstructorDecl *CopyConstructor = 8431 LookupCopyingConstructor(FieldClassDecl, Quals)) 8432 ExceptSpec.CalledDecl(CopyConstructor); 8433 } 8434 } 8435 8436 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8437} 8438 8439CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8440 CXXRecordDecl *ClassDecl) { 8441 // C++ [class.copy]p4: 8442 // If the class definition does not explicitly declare a copy 8443 // constructor, one is declared implicitly. 8444 8445 ImplicitExceptionSpecification Spec(Context); 8446 bool Const; 8447 llvm::tie(Spec, Const) = 8448 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8449 8450 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8451 QualType ArgType = ClassType; 8452 if (Const) 8453 ArgType = ArgType.withConst(); 8454 ArgType = Context.getLValueReferenceType(ArgType); 8455 8456 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8457 8458 DeclarationName Name 8459 = Context.DeclarationNames.getCXXConstructorName( 8460 Context.getCanonicalType(ClassType)); 8461 SourceLocation ClassLoc = ClassDecl->getLocation(); 8462 DeclarationNameInfo NameInfo(Name, ClassLoc); 8463 8464 // An implicitly-declared copy constructor is an inline public 8465 // member of its class. 8466 CXXConstructorDecl *CopyConstructor 8467 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8468 Context.getFunctionType(Context.VoidTy, 8469 &ArgType, 1, EPI), 8470 /*TInfo=*/0, 8471 /*isExplicit=*/false, 8472 /*isInline=*/true, 8473 /*isImplicitlyDeclared=*/true, 8474 // FIXME: apply the rules for definitions here 8475 /*isConstexpr=*/false); 8476 CopyConstructor->setAccess(AS_public); 8477 CopyConstructor->setDefaulted(); 8478 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8479 8480 // Note that we have declared this constructor. 8481 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8482 8483 // Add the parameter to the constructor. 8484 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8485 ClassLoc, ClassLoc, 8486 /*IdentifierInfo=*/0, 8487 ArgType, /*TInfo=*/0, 8488 SC_None, 8489 SC_None, 0); 8490 CopyConstructor->setParams(FromParam); 8491 8492 if (Scope *S = getScopeForContext(ClassDecl)) 8493 PushOnScopeChains(CopyConstructor, S, false); 8494 ClassDecl->addDecl(CopyConstructor); 8495 8496 // C++0x [class.copy]p7: 8497 // ... If the class definition declares a move constructor or move 8498 // assignment operator, the implicitly declared constructor is defined as 8499 // deleted; ... 8500 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8501 ClassDecl->hasUserDeclaredMoveAssignment() || 8502 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8503 CopyConstructor->setDeletedAsWritten(); 8504 8505 return CopyConstructor; 8506} 8507 8508void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8509 CXXConstructorDecl *CopyConstructor) { 8510 assert((CopyConstructor->isDefaulted() && 8511 CopyConstructor->isCopyConstructor() && 8512 !CopyConstructor->doesThisDeclarationHaveABody()) && 8513 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8514 8515 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8516 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8517 8518 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8519 DiagnosticErrorTrap Trap(Diags); 8520 8521 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8522 Trap.hasErrorOccurred()) { 8523 Diag(CurrentLocation, diag::note_member_synthesized_at) 8524 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8525 CopyConstructor->setInvalidDecl(); 8526 } else { 8527 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8528 CopyConstructor->getLocation(), 8529 MultiStmtArg(*this, 0, 0), 8530 /*isStmtExpr=*/false) 8531 .takeAs<Stmt>()); 8532 CopyConstructor->setImplicitlyDefined(true); 8533 } 8534 8535 CopyConstructor->setUsed(); 8536 if (ASTMutationListener *L = getASTMutationListener()) { 8537 L->CompletedImplicitDefinition(CopyConstructor); 8538 } 8539} 8540 8541Sema::ImplicitExceptionSpecification 8542Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8543 // C++ [except.spec]p14: 8544 // An implicitly declared special member function (Clause 12) shall have an 8545 // exception-specification. [...] 8546 ImplicitExceptionSpecification ExceptSpec(Context); 8547 if (ClassDecl->isInvalidDecl()) 8548 return ExceptSpec; 8549 8550 // Direct base-class constructors. 8551 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8552 BEnd = ClassDecl->bases_end(); 8553 B != BEnd; ++B) { 8554 if (B->isVirtual()) // Handled below. 8555 continue; 8556 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 // Virtual base-class constructors. 8568 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8569 BEnd = ClassDecl->vbases_end(); 8570 B != BEnd; ++B) { 8571 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8572 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8573 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8574 // If this is a deleted function, add it anyway. This might be conformant 8575 // with the standard. This might not. I'm not sure. It might not matter. 8576 if (Constructor) 8577 ExceptSpec.CalledDecl(Constructor); 8578 } 8579 } 8580 8581 // Field constructors. 8582 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8583 FEnd = ClassDecl->field_end(); 8584 F != FEnd; ++F) { 8585 if (F->hasInClassInitializer()) { 8586 if (Expr *E = F->getInClassInitializer()) 8587 ExceptSpec.CalledExpr(E); 8588 else if (!F->isInvalidDecl()) 8589 ExceptSpec.SetDelayed(); 8590 } else if (const RecordType *RecordTy 8591 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8592 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8593 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8594 // If this is a deleted function, add it anyway. This might be conformant 8595 // with the standard. This might not. I'm not sure. It might not matter. 8596 // In particular, the problem is that this function never gets called. It 8597 // might just be ill-formed because this function attempts to refer to 8598 // a deleted function here. 8599 if (Constructor) 8600 ExceptSpec.CalledDecl(Constructor); 8601 } 8602 } 8603 8604 return ExceptSpec; 8605} 8606 8607CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8608 CXXRecordDecl *ClassDecl) { 8609 ImplicitExceptionSpecification Spec( 8610 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8611 8612 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8613 QualType ArgType = Context.getRValueReferenceType(ClassType); 8614 8615 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8616 8617 DeclarationName Name 8618 = Context.DeclarationNames.getCXXConstructorName( 8619 Context.getCanonicalType(ClassType)); 8620 SourceLocation ClassLoc = ClassDecl->getLocation(); 8621 DeclarationNameInfo NameInfo(Name, ClassLoc); 8622 8623 // C++0x [class.copy]p11: 8624 // An implicitly-declared copy/move constructor is an inline public 8625 // member of its class. 8626 CXXConstructorDecl *MoveConstructor 8627 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8628 Context.getFunctionType(Context.VoidTy, 8629 &ArgType, 1, EPI), 8630 /*TInfo=*/0, 8631 /*isExplicit=*/false, 8632 /*isInline=*/true, 8633 /*isImplicitlyDeclared=*/true, 8634 // FIXME: apply the rules for definitions here 8635 /*isConstexpr=*/false); 8636 MoveConstructor->setAccess(AS_public); 8637 MoveConstructor->setDefaulted(); 8638 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8639 8640 // Add the parameter to the constructor. 8641 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8642 ClassLoc, ClassLoc, 8643 /*IdentifierInfo=*/0, 8644 ArgType, /*TInfo=*/0, 8645 SC_None, 8646 SC_None, 0); 8647 MoveConstructor->setParams(FromParam); 8648 8649 // C++0x [class.copy]p9: 8650 // If the definition of a class X does not explicitly declare a move 8651 // constructor, one will be implicitly declared as defaulted if and only if: 8652 // [...] 8653 // - the move constructor would not be implicitly defined as deleted. 8654 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8655 // Cache this result so that we don't try to generate this over and over 8656 // on every lookup, leaking memory and wasting time. 8657 ClassDecl->setFailedImplicitMoveConstructor(); 8658 return 0; 8659 } 8660 8661 // Note that we have declared this constructor. 8662 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8663 8664 if (Scope *S = getScopeForContext(ClassDecl)) 8665 PushOnScopeChains(MoveConstructor, S, false); 8666 ClassDecl->addDecl(MoveConstructor); 8667 8668 return MoveConstructor; 8669} 8670 8671void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8672 CXXConstructorDecl *MoveConstructor) { 8673 assert((MoveConstructor->isDefaulted() && 8674 MoveConstructor->isMoveConstructor() && 8675 !MoveConstructor->doesThisDeclarationHaveABody()) && 8676 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8677 8678 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8679 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8680 8681 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8682 DiagnosticErrorTrap Trap(Diags); 8683 8684 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8685 Trap.hasErrorOccurred()) { 8686 Diag(CurrentLocation, diag::note_member_synthesized_at) 8687 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8688 MoveConstructor->setInvalidDecl(); 8689 } else { 8690 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8691 MoveConstructor->getLocation(), 8692 MultiStmtArg(*this, 0, 0), 8693 /*isStmtExpr=*/false) 8694 .takeAs<Stmt>()); 8695 MoveConstructor->setImplicitlyDefined(true); 8696 } 8697 8698 MoveConstructor->setUsed(); 8699 8700 if (ASTMutationListener *L = getASTMutationListener()) { 8701 L->CompletedImplicitDefinition(MoveConstructor); 8702 } 8703} 8704 8705ExprResult 8706Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8707 CXXConstructorDecl *Constructor, 8708 MultiExprArg ExprArgs, 8709 bool HadMultipleCandidates, 8710 bool RequiresZeroInit, 8711 unsigned ConstructKind, 8712 SourceRange ParenRange) { 8713 bool Elidable = false; 8714 8715 // C++0x [class.copy]p34: 8716 // When certain criteria are met, an implementation is allowed to 8717 // omit the copy/move construction of a class object, even if the 8718 // copy/move constructor and/or destructor for the object have 8719 // side effects. [...] 8720 // - when a temporary class object that has not been bound to a 8721 // reference (12.2) would be copied/moved to a class object 8722 // with the same cv-unqualified type, the copy/move operation 8723 // can be omitted by constructing the temporary object 8724 // directly into the target of the omitted copy/move 8725 if (ConstructKind == CXXConstructExpr::CK_Complete && 8726 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8727 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8728 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8729 } 8730 8731 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8732 Elidable, move(ExprArgs), HadMultipleCandidates, 8733 RequiresZeroInit, ConstructKind, ParenRange); 8734} 8735 8736/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8737/// including handling of its default argument expressions. 8738ExprResult 8739Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8740 CXXConstructorDecl *Constructor, bool Elidable, 8741 MultiExprArg ExprArgs, 8742 bool HadMultipleCandidates, 8743 bool RequiresZeroInit, 8744 unsigned ConstructKind, 8745 SourceRange ParenRange) { 8746 unsigned NumExprs = ExprArgs.size(); 8747 Expr **Exprs = (Expr **)ExprArgs.release(); 8748 8749 for (specific_attr_iterator<NonNullAttr> 8750 i = Constructor->specific_attr_begin<NonNullAttr>(), 8751 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8752 const NonNullAttr *NonNull = *i; 8753 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8754 } 8755 8756 MarkDeclarationReferenced(ConstructLoc, Constructor); 8757 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8758 Constructor, Elidable, Exprs, NumExprs, 8759 HadMultipleCandidates, RequiresZeroInit, 8760 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8761 ParenRange)); 8762} 8763 8764bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8765 CXXConstructorDecl *Constructor, 8766 MultiExprArg Exprs, 8767 bool HadMultipleCandidates) { 8768 // FIXME: Provide the correct paren SourceRange when available. 8769 ExprResult TempResult = 8770 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8771 move(Exprs), HadMultipleCandidates, false, 8772 CXXConstructExpr::CK_Complete, SourceRange()); 8773 if (TempResult.isInvalid()) 8774 return true; 8775 8776 Expr *Temp = TempResult.takeAs<Expr>(); 8777 CheckImplicitConversions(Temp, VD->getLocation()); 8778 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8779 Temp = MaybeCreateExprWithCleanups(Temp); 8780 VD->setInit(Temp); 8781 8782 return false; 8783} 8784 8785void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8786 if (VD->isInvalidDecl()) return; 8787 8788 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8789 if (ClassDecl->isInvalidDecl()) return; 8790 if (ClassDecl->hasTrivialDestructor()) return; 8791 if (ClassDecl->isDependentContext()) return; 8792 8793 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8794 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8795 CheckDestructorAccess(VD->getLocation(), Destructor, 8796 PDiag(diag::err_access_dtor_var) 8797 << VD->getDeclName() 8798 << VD->getType()); 8799 8800 if (!VD->hasGlobalStorage()) return; 8801 8802 // Emit warning for non-trivial dtor in global scope (a real global, 8803 // class-static, function-static). 8804 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8805 8806 // TODO: this should be re-enabled for static locals by !CXAAtExit 8807 if (!VD->isStaticLocal()) 8808 Diag(VD->getLocation(), diag::warn_global_destructor); 8809} 8810 8811/// AddCXXDirectInitializerToDecl - This action is called immediately after 8812/// ActOnDeclarator, when a C++ direct initializer is present. 8813/// e.g: "int x(1);" 8814void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8815 SourceLocation LParenLoc, 8816 MultiExprArg Exprs, 8817 SourceLocation RParenLoc, 8818 bool TypeMayContainAuto) { 8819 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8820 8821 // If there is no declaration, there was an error parsing it. Just ignore 8822 // the initializer. 8823 if (RealDecl == 0) 8824 return; 8825 8826 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8827 if (!VDecl) { 8828 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8829 RealDecl->setInvalidDecl(); 8830 return; 8831 } 8832 8833 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8834 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8835 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8836 if (Exprs.size() > 1) { 8837 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8838 diag::err_auto_var_init_multiple_expressions) 8839 << VDecl->getDeclName() << VDecl->getType() 8840 << VDecl->getSourceRange(); 8841 RealDecl->setInvalidDecl(); 8842 return; 8843 } 8844 8845 Expr *Init = Exprs.get()[0]; 8846 TypeSourceInfo *DeducedType = 0; 8847 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8848 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8849 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8850 << Init->getSourceRange(); 8851 if (!DeducedType) { 8852 RealDecl->setInvalidDecl(); 8853 return; 8854 } 8855 VDecl->setTypeSourceInfo(DeducedType); 8856 VDecl->setType(DeducedType->getType()); 8857 8858 // In ARC, infer lifetime. 8859 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8860 VDecl->setInvalidDecl(); 8861 8862 // If this is a redeclaration, check that the type we just deduced matches 8863 // the previously declared type. 8864 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8865 MergeVarDeclTypes(VDecl, Old); 8866 } 8867 8868 // We will represent direct-initialization similarly to copy-initialization: 8869 // int x(1); -as-> int x = 1; 8870 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8871 // 8872 // Clients that want to distinguish between the two forms, can check for 8873 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8874 // A major benefit is that clients that don't particularly care about which 8875 // exactly form was it (like the CodeGen) can handle both cases without 8876 // special case code. 8877 8878 // C++ 8.5p11: 8879 // The form of initialization (using parentheses or '=') is generally 8880 // insignificant, but does matter when the entity being initialized has a 8881 // class type. 8882 8883 if (!VDecl->getType()->isDependentType() && 8884 !VDecl->getType()->isIncompleteArrayType() && 8885 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8886 diag::err_typecheck_decl_incomplete_type)) { 8887 VDecl->setInvalidDecl(); 8888 return; 8889 } 8890 8891 // The variable can not have an abstract class type. 8892 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8893 diag::err_abstract_type_in_decl, 8894 AbstractVariableType)) 8895 VDecl->setInvalidDecl(); 8896 8897 const VarDecl *Def; 8898 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8899 Diag(VDecl->getLocation(), diag::err_redefinition) 8900 << VDecl->getDeclName(); 8901 Diag(Def->getLocation(), diag::note_previous_definition); 8902 VDecl->setInvalidDecl(); 8903 return; 8904 } 8905 8906 // C++ [class.static.data]p4 8907 // If a static data member is of const integral or const 8908 // enumeration type, its declaration in the class definition can 8909 // specify a constant-initializer which shall be an integral 8910 // constant expression (5.19). In that case, the member can appear 8911 // in integral constant expressions. The member shall still be 8912 // defined in a namespace scope if it is used in the program and the 8913 // namespace scope definition shall not contain an initializer. 8914 // 8915 // We already performed a redefinition check above, but for static 8916 // data members we also need to check whether there was an in-class 8917 // declaration with an initializer. 8918 const VarDecl* PrevInit = 0; 8919 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8920 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8921 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8922 return; 8923 } 8924 8925 bool IsDependent = false; 8926 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8927 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8928 VDecl->setInvalidDecl(); 8929 return; 8930 } 8931 8932 if (Exprs.get()[I]->isTypeDependent()) 8933 IsDependent = true; 8934 } 8935 8936 // If either the declaration has a dependent type or if any of the 8937 // expressions is type-dependent, we represent the initialization 8938 // via a ParenListExpr for later use during template instantiation. 8939 if (VDecl->getType()->isDependentType() || IsDependent) { 8940 // Let clients know that initialization was done with a direct initializer. 8941 VDecl->setCXXDirectInitializer(true); 8942 8943 // Store the initialization expressions as a ParenListExpr. 8944 unsigned NumExprs = Exprs.size(); 8945 VDecl->setInit(new (Context) ParenListExpr( 8946 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8947 VDecl->getType().getNonReferenceType())); 8948 return; 8949 } 8950 8951 // Capture the variable that is being initialized and the style of 8952 // initialization. 8953 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8954 8955 // FIXME: Poor source location information. 8956 InitializationKind Kind 8957 = InitializationKind::CreateDirect(VDecl->getLocation(), 8958 LParenLoc, RParenLoc); 8959 8960 QualType T = VDecl->getType(); 8961 InitializationSequence InitSeq(*this, Entity, Kind, 8962 Exprs.get(), Exprs.size()); 8963 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8964 if (Result.isInvalid()) { 8965 VDecl->setInvalidDecl(); 8966 return; 8967 } else if (T != VDecl->getType()) { 8968 VDecl->setType(T); 8969 Result.get()->setType(T); 8970 } 8971 8972 8973 Expr *Init = Result.get(); 8974 CheckImplicitConversions(Init, LParenLoc); 8975 8976 Init = MaybeCreateExprWithCleanups(Init); 8977 VDecl->setInit(Init); 8978 VDecl->setCXXDirectInitializer(true); 8979 8980 CheckCompleteVariableDeclaration(VDecl); 8981} 8982 8983/// \brief Given a constructor and the set of arguments provided for the 8984/// constructor, convert the arguments and add any required default arguments 8985/// to form a proper call to this constructor. 8986/// 8987/// \returns true if an error occurred, false otherwise. 8988bool 8989Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8990 MultiExprArg ArgsPtr, 8991 SourceLocation Loc, 8992 ASTOwningVector<Expr*> &ConvertedArgs) { 8993 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8994 unsigned NumArgs = ArgsPtr.size(); 8995 Expr **Args = (Expr **)ArgsPtr.get(); 8996 8997 const FunctionProtoType *Proto 8998 = Constructor->getType()->getAs<FunctionProtoType>(); 8999 assert(Proto && "Constructor without a prototype?"); 9000 unsigned NumArgsInProto = Proto->getNumArgs(); 9001 9002 // If too few arguments are available, we'll fill in the rest with defaults. 9003 if (NumArgs < NumArgsInProto) 9004 ConvertedArgs.reserve(NumArgsInProto); 9005 else 9006 ConvertedArgs.reserve(NumArgs); 9007 9008 VariadicCallType CallType = 9009 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9010 SmallVector<Expr *, 8> AllArgs; 9011 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9012 Proto, 0, Args, NumArgs, AllArgs, 9013 CallType); 9014 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9015 ConvertedArgs.push_back(AllArgs[i]); 9016 return Invalid; 9017} 9018 9019static inline bool 9020CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9021 const FunctionDecl *FnDecl) { 9022 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9023 if (isa<NamespaceDecl>(DC)) { 9024 return SemaRef.Diag(FnDecl->getLocation(), 9025 diag::err_operator_new_delete_declared_in_namespace) 9026 << FnDecl->getDeclName(); 9027 } 9028 9029 if (isa<TranslationUnitDecl>(DC) && 9030 FnDecl->getStorageClass() == SC_Static) { 9031 return SemaRef.Diag(FnDecl->getLocation(), 9032 diag::err_operator_new_delete_declared_static) 9033 << FnDecl->getDeclName(); 9034 } 9035 9036 return false; 9037} 9038 9039static inline bool 9040CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9041 CanQualType ExpectedResultType, 9042 CanQualType ExpectedFirstParamType, 9043 unsigned DependentParamTypeDiag, 9044 unsigned InvalidParamTypeDiag) { 9045 QualType ResultType = 9046 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9047 9048 // Check that the result type is not dependent. 9049 if (ResultType->isDependentType()) 9050 return SemaRef.Diag(FnDecl->getLocation(), 9051 diag::err_operator_new_delete_dependent_result_type) 9052 << FnDecl->getDeclName() << ExpectedResultType; 9053 9054 // Check that the result type is what we expect. 9055 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9056 return SemaRef.Diag(FnDecl->getLocation(), 9057 diag::err_operator_new_delete_invalid_result_type) 9058 << FnDecl->getDeclName() << ExpectedResultType; 9059 9060 // A function template must have at least 2 parameters. 9061 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9062 return SemaRef.Diag(FnDecl->getLocation(), 9063 diag::err_operator_new_delete_template_too_few_parameters) 9064 << FnDecl->getDeclName(); 9065 9066 // The function decl must have at least 1 parameter. 9067 if (FnDecl->getNumParams() == 0) 9068 return SemaRef.Diag(FnDecl->getLocation(), 9069 diag::err_operator_new_delete_too_few_parameters) 9070 << FnDecl->getDeclName(); 9071 9072 // Check the the first parameter type is not dependent. 9073 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9074 if (FirstParamType->isDependentType()) 9075 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9076 << FnDecl->getDeclName() << ExpectedFirstParamType; 9077 9078 // Check that the first parameter type is what we expect. 9079 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9080 ExpectedFirstParamType) 9081 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9082 << FnDecl->getDeclName() << ExpectedFirstParamType; 9083 9084 return false; 9085} 9086 9087static bool 9088CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9089 // C++ [basic.stc.dynamic.allocation]p1: 9090 // A program is ill-formed if an allocation function is declared in a 9091 // namespace scope other than global scope or declared static in global 9092 // scope. 9093 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9094 return true; 9095 9096 CanQualType SizeTy = 9097 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9098 9099 // C++ [basic.stc.dynamic.allocation]p1: 9100 // The return type shall be void*. The first parameter shall have type 9101 // std::size_t. 9102 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9103 SizeTy, 9104 diag::err_operator_new_dependent_param_type, 9105 diag::err_operator_new_param_type)) 9106 return true; 9107 9108 // C++ [basic.stc.dynamic.allocation]p1: 9109 // The first parameter shall not have an associated default argument. 9110 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9111 return SemaRef.Diag(FnDecl->getLocation(), 9112 diag::err_operator_new_default_arg) 9113 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9114 9115 return false; 9116} 9117 9118static bool 9119CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9120 // C++ [basic.stc.dynamic.deallocation]p1: 9121 // A program is ill-formed if deallocation functions are declared in a 9122 // namespace scope other than global scope or declared static in global 9123 // scope. 9124 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9125 return true; 9126 9127 // C++ [basic.stc.dynamic.deallocation]p2: 9128 // Each deallocation function shall return void and its first parameter 9129 // shall be void*. 9130 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9131 SemaRef.Context.VoidPtrTy, 9132 diag::err_operator_delete_dependent_param_type, 9133 diag::err_operator_delete_param_type)) 9134 return true; 9135 9136 return false; 9137} 9138 9139/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9140/// of this overloaded operator is well-formed. If so, returns false; 9141/// otherwise, emits appropriate diagnostics and returns true. 9142bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9143 assert(FnDecl && FnDecl->isOverloadedOperator() && 9144 "Expected an overloaded operator declaration"); 9145 9146 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9147 9148 // C++ [over.oper]p5: 9149 // The allocation and deallocation functions, operator new, 9150 // operator new[], operator delete and operator delete[], are 9151 // described completely in 3.7.3. The attributes and restrictions 9152 // found in the rest of this subclause do not apply to them unless 9153 // explicitly stated in 3.7.3. 9154 if (Op == OO_Delete || Op == OO_Array_Delete) 9155 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9156 9157 if (Op == OO_New || Op == OO_Array_New) 9158 return CheckOperatorNewDeclaration(*this, FnDecl); 9159 9160 // C++ [over.oper]p6: 9161 // An operator function shall either be a non-static member 9162 // function or be a non-member function and have at least one 9163 // parameter whose type is a class, a reference to a class, an 9164 // enumeration, or a reference to an enumeration. 9165 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9166 if (MethodDecl->isStatic()) 9167 return Diag(FnDecl->getLocation(), 9168 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9169 } else { 9170 bool ClassOrEnumParam = false; 9171 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9172 ParamEnd = FnDecl->param_end(); 9173 Param != ParamEnd; ++Param) { 9174 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9175 if (ParamType->isDependentType() || ParamType->isRecordType() || 9176 ParamType->isEnumeralType()) { 9177 ClassOrEnumParam = true; 9178 break; 9179 } 9180 } 9181 9182 if (!ClassOrEnumParam) 9183 return Diag(FnDecl->getLocation(), 9184 diag::err_operator_overload_needs_class_or_enum) 9185 << FnDecl->getDeclName(); 9186 } 9187 9188 // C++ [over.oper]p8: 9189 // An operator function cannot have default arguments (8.3.6), 9190 // except where explicitly stated below. 9191 // 9192 // Only the function-call operator allows default arguments 9193 // (C++ [over.call]p1). 9194 if (Op != OO_Call) { 9195 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9196 Param != FnDecl->param_end(); ++Param) { 9197 if ((*Param)->hasDefaultArg()) 9198 return Diag((*Param)->getLocation(), 9199 diag::err_operator_overload_default_arg) 9200 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9201 } 9202 } 9203 9204 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9205 { false, false, false } 9206#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9207 , { Unary, Binary, MemberOnly } 9208#include "clang/Basic/OperatorKinds.def" 9209 }; 9210 9211 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9212 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9213 bool MustBeMemberOperator = OperatorUses[Op][2]; 9214 9215 // C++ [over.oper]p8: 9216 // [...] Operator functions cannot have more or fewer parameters 9217 // than the number required for the corresponding operator, as 9218 // described in the rest of this subclause. 9219 unsigned NumParams = FnDecl->getNumParams() 9220 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9221 if (Op != OO_Call && 9222 ((NumParams == 1 && !CanBeUnaryOperator) || 9223 (NumParams == 2 && !CanBeBinaryOperator) || 9224 (NumParams < 1) || (NumParams > 2))) { 9225 // We have the wrong number of parameters. 9226 unsigned ErrorKind; 9227 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9228 ErrorKind = 2; // 2 -> unary or binary. 9229 } else if (CanBeUnaryOperator) { 9230 ErrorKind = 0; // 0 -> unary 9231 } else { 9232 assert(CanBeBinaryOperator && 9233 "All non-call overloaded operators are unary or binary!"); 9234 ErrorKind = 1; // 1 -> binary 9235 } 9236 9237 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9238 << FnDecl->getDeclName() << NumParams << ErrorKind; 9239 } 9240 9241 // Overloaded operators other than operator() cannot be variadic. 9242 if (Op != OO_Call && 9243 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9244 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9245 << FnDecl->getDeclName(); 9246 } 9247 9248 // Some operators must be non-static member functions. 9249 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9250 return Diag(FnDecl->getLocation(), 9251 diag::err_operator_overload_must_be_member) 9252 << FnDecl->getDeclName(); 9253 } 9254 9255 // C++ [over.inc]p1: 9256 // The user-defined function called operator++ implements the 9257 // prefix and postfix ++ operator. If this function is a member 9258 // function with no parameters, or a non-member function with one 9259 // parameter of class or enumeration type, it defines the prefix 9260 // increment operator ++ for objects of that type. If the function 9261 // is a member function with one parameter (which shall be of type 9262 // int) or a non-member function with two parameters (the second 9263 // of which shall be of type int), it defines the postfix 9264 // increment operator ++ for objects of that type. 9265 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9266 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9267 bool ParamIsInt = false; 9268 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9269 ParamIsInt = BT->getKind() == BuiltinType::Int; 9270 9271 if (!ParamIsInt) 9272 return Diag(LastParam->getLocation(), 9273 diag::err_operator_overload_post_incdec_must_be_int) 9274 << LastParam->getType() << (Op == OO_MinusMinus); 9275 } 9276 9277 return false; 9278} 9279 9280/// CheckLiteralOperatorDeclaration - Check whether the declaration 9281/// of this literal operator function is well-formed. If so, returns 9282/// false; otherwise, emits appropriate diagnostics and returns true. 9283bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9284 DeclContext *DC = FnDecl->getDeclContext(); 9285 Decl::Kind Kind = DC->getDeclKind(); 9286 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9287 Kind != Decl::LinkageSpec) { 9288 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9289 << FnDecl->getDeclName(); 9290 return true; 9291 } 9292 9293 bool Valid = false; 9294 9295 // template <char...> type operator "" name() is the only valid template 9296 // signature, and the only valid signature with no parameters. 9297 if (FnDecl->param_size() == 0) { 9298 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9299 // Must have only one template parameter 9300 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9301 if (Params->size() == 1) { 9302 NonTypeTemplateParmDecl *PmDecl = 9303 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9304 9305 // The template parameter must be a char parameter pack. 9306 if (PmDecl && PmDecl->isTemplateParameterPack() && 9307 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9308 Valid = true; 9309 } 9310 } 9311 } else { 9312 // Check the first parameter 9313 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9314 9315 QualType T = (*Param)->getType(); 9316 9317 // unsigned long long int, long double, and any character type are allowed 9318 // as the only parameters. 9319 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9320 Context.hasSameType(T, Context.LongDoubleTy) || 9321 Context.hasSameType(T, Context.CharTy) || 9322 Context.hasSameType(T, Context.WCharTy) || 9323 Context.hasSameType(T, Context.Char16Ty) || 9324 Context.hasSameType(T, Context.Char32Ty)) { 9325 if (++Param == FnDecl->param_end()) 9326 Valid = true; 9327 goto FinishedParams; 9328 } 9329 9330 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9331 const PointerType *PT = T->getAs<PointerType>(); 9332 if (!PT) 9333 goto FinishedParams; 9334 T = PT->getPointeeType(); 9335 if (!T.isConstQualified()) 9336 goto FinishedParams; 9337 T = T.getUnqualifiedType(); 9338 9339 // Move on to the second parameter; 9340 ++Param; 9341 9342 // If there is no second parameter, the first must be a const char * 9343 if (Param == FnDecl->param_end()) { 9344 if (Context.hasSameType(T, Context.CharTy)) 9345 Valid = true; 9346 goto FinishedParams; 9347 } 9348 9349 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9350 // are allowed as the first parameter to a two-parameter function 9351 if (!(Context.hasSameType(T, Context.CharTy) || 9352 Context.hasSameType(T, Context.WCharTy) || 9353 Context.hasSameType(T, Context.Char16Ty) || 9354 Context.hasSameType(T, Context.Char32Ty))) 9355 goto FinishedParams; 9356 9357 // The second and final parameter must be an std::size_t 9358 T = (*Param)->getType().getUnqualifiedType(); 9359 if (Context.hasSameType(T, Context.getSizeType()) && 9360 ++Param == FnDecl->param_end()) 9361 Valid = true; 9362 } 9363 9364 // FIXME: This diagnostic is absolutely terrible. 9365FinishedParams: 9366 if (!Valid) { 9367 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9368 << FnDecl->getDeclName(); 9369 return true; 9370 } 9371 9372 StringRef LiteralName 9373 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9374 if (LiteralName[0] != '_') { 9375 // C++0x [usrlit.suffix]p1: 9376 // Literal suffix identifiers that do not start with an underscore are 9377 // reserved for future standardization. 9378 bool IsHexFloat = true; 9379 if (LiteralName.size() > 1 && 9380 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9381 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9382 if (!isdigit(LiteralName[I])) { 9383 IsHexFloat = false; 9384 break; 9385 } 9386 } 9387 } 9388 9389 if (IsHexFloat) 9390 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9391 << LiteralName; 9392 else 9393 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9394 } 9395 9396 return false; 9397} 9398 9399/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9400/// linkage specification, including the language and (if present) 9401/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9402/// the location of the language string literal, which is provided 9403/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9404/// the '{' brace. Otherwise, this linkage specification does not 9405/// have any braces. 9406Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9407 SourceLocation LangLoc, 9408 StringRef Lang, 9409 SourceLocation LBraceLoc) { 9410 LinkageSpecDecl::LanguageIDs Language; 9411 if (Lang == "\"C\"") 9412 Language = LinkageSpecDecl::lang_c; 9413 else if (Lang == "\"C++\"") 9414 Language = LinkageSpecDecl::lang_cxx; 9415 else { 9416 Diag(LangLoc, diag::err_bad_language); 9417 return 0; 9418 } 9419 9420 // FIXME: Add all the various semantics of linkage specifications 9421 9422 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9423 ExternLoc, LangLoc, Language); 9424 CurContext->addDecl(D); 9425 PushDeclContext(S, D); 9426 return D; 9427} 9428 9429/// ActOnFinishLinkageSpecification - Complete the definition of 9430/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9431/// valid, it's the position of the closing '}' brace in a linkage 9432/// specification that uses braces. 9433Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9434 Decl *LinkageSpec, 9435 SourceLocation RBraceLoc) { 9436 if (LinkageSpec) { 9437 if (RBraceLoc.isValid()) { 9438 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9439 LSDecl->setRBraceLoc(RBraceLoc); 9440 } 9441 PopDeclContext(); 9442 } 9443 return LinkageSpec; 9444} 9445 9446/// \brief Perform semantic analysis for the variable declaration that 9447/// occurs within a C++ catch clause, returning the newly-created 9448/// variable. 9449VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9450 TypeSourceInfo *TInfo, 9451 SourceLocation StartLoc, 9452 SourceLocation Loc, 9453 IdentifierInfo *Name) { 9454 bool Invalid = false; 9455 QualType ExDeclType = TInfo->getType(); 9456 9457 // Arrays and functions decay. 9458 if (ExDeclType->isArrayType()) 9459 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9460 else if (ExDeclType->isFunctionType()) 9461 ExDeclType = Context.getPointerType(ExDeclType); 9462 9463 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9464 // The exception-declaration shall not denote a pointer or reference to an 9465 // incomplete type, other than [cv] void*. 9466 // N2844 forbids rvalue references. 9467 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9468 Diag(Loc, diag::err_catch_rvalue_ref); 9469 Invalid = true; 9470 } 9471 9472 // GCC allows catching pointers and references to incomplete types 9473 // as an extension; so do we, but we warn by default. 9474 9475 QualType BaseType = ExDeclType; 9476 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9477 unsigned DK = diag::err_catch_incomplete; 9478 bool IncompleteCatchIsInvalid = true; 9479 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9480 BaseType = Ptr->getPointeeType(); 9481 Mode = 1; 9482 DK = diag::ext_catch_incomplete_ptr; 9483 IncompleteCatchIsInvalid = false; 9484 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9485 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9486 BaseType = Ref->getPointeeType(); 9487 Mode = 2; 9488 DK = diag::ext_catch_incomplete_ref; 9489 IncompleteCatchIsInvalid = false; 9490 } 9491 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9492 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9493 IncompleteCatchIsInvalid) 9494 Invalid = true; 9495 9496 if (!Invalid && !ExDeclType->isDependentType() && 9497 RequireNonAbstractType(Loc, ExDeclType, 9498 diag::err_abstract_type_in_decl, 9499 AbstractVariableType)) 9500 Invalid = true; 9501 9502 // Only the non-fragile NeXT runtime currently supports C++ catches 9503 // of ObjC types, and no runtime supports catching ObjC types by value. 9504 if (!Invalid && getLangOptions().ObjC1) { 9505 QualType T = ExDeclType; 9506 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9507 T = RT->getPointeeType(); 9508 9509 if (T->isObjCObjectType()) { 9510 Diag(Loc, diag::err_objc_object_catch); 9511 Invalid = true; 9512 } else if (T->isObjCObjectPointerType()) { 9513 if (!getLangOptions().ObjCNonFragileABI) 9514 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9515 } 9516 } 9517 9518 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9519 ExDeclType, TInfo, SC_None, SC_None); 9520 ExDecl->setExceptionVariable(true); 9521 9522 if (!Invalid && !ExDeclType->isDependentType()) { 9523 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9524 // C++ [except.handle]p16: 9525 // The object declared in an exception-declaration or, if the 9526 // exception-declaration does not specify a name, a temporary (12.2) is 9527 // copy-initialized (8.5) from the exception object. [...] 9528 // The object is destroyed when the handler exits, after the destruction 9529 // of any automatic objects initialized within the handler. 9530 // 9531 // We just pretend to initialize the object with itself, then make sure 9532 // it can be destroyed later. 9533 QualType initType = ExDeclType; 9534 9535 InitializedEntity entity = 9536 InitializedEntity::InitializeVariable(ExDecl); 9537 InitializationKind initKind = 9538 InitializationKind::CreateCopy(Loc, SourceLocation()); 9539 9540 Expr *opaqueValue = 9541 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9542 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9543 ExprResult result = sequence.Perform(*this, entity, initKind, 9544 MultiExprArg(&opaqueValue, 1)); 9545 if (result.isInvalid()) 9546 Invalid = true; 9547 else { 9548 // If the constructor used was non-trivial, set this as the 9549 // "initializer". 9550 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9551 if (!construct->getConstructor()->isTrivial()) { 9552 Expr *init = MaybeCreateExprWithCleanups(construct); 9553 ExDecl->setInit(init); 9554 } 9555 9556 // And make sure it's destructable. 9557 FinalizeVarWithDestructor(ExDecl, recordType); 9558 } 9559 } 9560 } 9561 9562 if (Invalid) 9563 ExDecl->setInvalidDecl(); 9564 9565 return ExDecl; 9566} 9567 9568/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9569/// handler. 9570Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9571 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9572 bool Invalid = D.isInvalidType(); 9573 9574 // Check for unexpanded parameter packs. 9575 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9576 UPPC_ExceptionType)) { 9577 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9578 D.getIdentifierLoc()); 9579 Invalid = true; 9580 } 9581 9582 IdentifierInfo *II = D.getIdentifier(); 9583 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9584 LookupOrdinaryName, 9585 ForRedeclaration)) { 9586 // The scope should be freshly made just for us. There is just no way 9587 // it contains any previous declaration. 9588 assert(!S->isDeclScope(PrevDecl)); 9589 if (PrevDecl->isTemplateParameter()) { 9590 // Maybe we will complain about the shadowed template parameter. 9591 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9592 PrevDecl = 0; 9593 } 9594 } 9595 9596 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9597 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9598 << D.getCXXScopeSpec().getRange(); 9599 Invalid = true; 9600 } 9601 9602 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9603 D.getSourceRange().getBegin(), 9604 D.getIdentifierLoc(), 9605 D.getIdentifier()); 9606 if (Invalid) 9607 ExDecl->setInvalidDecl(); 9608 9609 // Add the exception declaration into this scope. 9610 if (II) 9611 PushOnScopeChains(ExDecl, S); 9612 else 9613 CurContext->addDecl(ExDecl); 9614 9615 ProcessDeclAttributes(S, ExDecl, D); 9616 return ExDecl; 9617} 9618 9619Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9620 Expr *AssertExpr, 9621 Expr *AssertMessageExpr_, 9622 SourceLocation RParenLoc) { 9623 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9624 9625 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9626 llvm::APSInt Value(32); 9627 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9628 Diag(StaticAssertLoc, 9629 diag::err_static_assert_expression_is_not_constant) << 9630 AssertExpr->getSourceRange(); 9631 return 0; 9632 } 9633 9634 if (Value == 0) { 9635 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9636 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9637 } 9638 } 9639 9640 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9641 return 0; 9642 9643 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9644 AssertExpr, AssertMessage, RParenLoc); 9645 9646 CurContext->addDecl(Decl); 9647 return Decl; 9648} 9649 9650/// \brief Perform semantic analysis of the given friend type declaration. 9651/// 9652/// \returns A friend declaration that. 9653FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9654 SourceLocation FriendLoc, 9655 TypeSourceInfo *TSInfo) { 9656 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9657 9658 QualType T = TSInfo->getType(); 9659 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9660 9661 // C++03 [class.friend]p2: 9662 // An elaborated-type-specifier shall be used in a friend declaration 9663 // for a class.* 9664 // 9665 // * The class-key of the elaborated-type-specifier is required. 9666 if (!ActiveTemplateInstantiations.empty()) { 9667 // Do not complain about the form of friend template types during 9668 // template instantiation; we will already have complained when the 9669 // template was declared. 9670 } else if (!T->isElaboratedTypeSpecifier()) { 9671 // If we evaluated the type to a record type, suggest putting 9672 // a tag in front. 9673 if (const RecordType *RT = T->getAs<RecordType>()) { 9674 RecordDecl *RD = RT->getDecl(); 9675 9676 std::string InsertionText = std::string(" ") + RD->getKindName(); 9677 9678 Diag(TypeRange.getBegin(), 9679 getLangOptions().CPlusPlus0x ? 9680 diag::warn_cxx98_compat_unelaborated_friend_type : 9681 diag::ext_unelaborated_friend_type) 9682 << (unsigned) RD->getTagKind() 9683 << T 9684 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9685 InsertionText); 9686 } else { 9687 Diag(FriendLoc, 9688 getLangOptions().CPlusPlus0x ? 9689 diag::warn_cxx98_compat_nonclass_type_friend : 9690 diag::ext_nonclass_type_friend) 9691 << T 9692 << SourceRange(FriendLoc, TypeRange.getEnd()); 9693 } 9694 } else if (T->getAs<EnumType>()) { 9695 Diag(FriendLoc, 9696 getLangOptions().CPlusPlus0x ? 9697 diag::warn_cxx98_compat_enum_friend : 9698 diag::ext_enum_friend) 9699 << T 9700 << SourceRange(FriendLoc, TypeRange.getEnd()); 9701 } 9702 9703 // C++0x [class.friend]p3: 9704 // If the type specifier in a friend declaration designates a (possibly 9705 // cv-qualified) class type, that class is declared as a friend; otherwise, 9706 // the friend declaration is ignored. 9707 9708 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9709 // in [class.friend]p3 that we do not implement. 9710 9711 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9712} 9713 9714/// Handle a friend tag declaration where the scope specifier was 9715/// templated. 9716Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9717 unsigned TagSpec, SourceLocation TagLoc, 9718 CXXScopeSpec &SS, 9719 IdentifierInfo *Name, SourceLocation NameLoc, 9720 AttributeList *Attr, 9721 MultiTemplateParamsArg TempParamLists) { 9722 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9723 9724 bool isExplicitSpecialization = false; 9725 bool Invalid = false; 9726 9727 if (TemplateParameterList *TemplateParams 9728 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9729 TempParamLists.get(), 9730 TempParamLists.size(), 9731 /*friend*/ true, 9732 isExplicitSpecialization, 9733 Invalid)) { 9734 if (TemplateParams->size() > 0) { 9735 // This is a declaration of a class template. 9736 if (Invalid) 9737 return 0; 9738 9739 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9740 SS, Name, NameLoc, Attr, 9741 TemplateParams, AS_public, 9742 /*ModulePrivateLoc=*/SourceLocation(), 9743 TempParamLists.size() - 1, 9744 (TemplateParameterList**) TempParamLists.release()).take(); 9745 } else { 9746 // The "template<>" header is extraneous. 9747 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9748 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9749 isExplicitSpecialization = true; 9750 } 9751 } 9752 9753 if (Invalid) return 0; 9754 9755 bool isAllExplicitSpecializations = true; 9756 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9757 if (TempParamLists.get()[I]->size()) { 9758 isAllExplicitSpecializations = false; 9759 break; 9760 } 9761 } 9762 9763 // FIXME: don't ignore attributes. 9764 9765 // If it's explicit specializations all the way down, just forget 9766 // about the template header and build an appropriate non-templated 9767 // friend. TODO: for source fidelity, remember the headers. 9768 if (isAllExplicitSpecializations) { 9769 if (SS.isEmpty()) { 9770 bool Owned = false; 9771 bool IsDependent = false; 9772 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9773 Attr, AS_public, 9774 /*ModulePrivateLoc=*/SourceLocation(), 9775 MultiTemplateParamsArg(), Owned, IsDependent, 9776 /*ScopedEnum=*/false, 9777 /*ScopedEnumUsesClassTag=*/false, 9778 /*UnderlyingType=*/TypeResult()); 9779 } 9780 9781 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9782 ElaboratedTypeKeyword Keyword 9783 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9784 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9785 *Name, NameLoc); 9786 if (T.isNull()) 9787 return 0; 9788 9789 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9790 if (isa<DependentNameType>(T)) { 9791 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9792 TL.setKeywordLoc(TagLoc); 9793 TL.setQualifierLoc(QualifierLoc); 9794 TL.setNameLoc(NameLoc); 9795 } else { 9796 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9797 TL.setKeywordLoc(TagLoc); 9798 TL.setQualifierLoc(QualifierLoc); 9799 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9800 } 9801 9802 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9803 TSI, FriendLoc); 9804 Friend->setAccess(AS_public); 9805 CurContext->addDecl(Friend); 9806 return Friend; 9807 } 9808 9809 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9810 9811 9812 9813 // Handle the case of a templated-scope friend class. e.g. 9814 // template <class T> class A<T>::B; 9815 // FIXME: we don't support these right now. 9816 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9817 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9818 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9819 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9820 TL.setKeywordLoc(TagLoc); 9821 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9822 TL.setNameLoc(NameLoc); 9823 9824 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9825 TSI, FriendLoc); 9826 Friend->setAccess(AS_public); 9827 Friend->setUnsupportedFriend(true); 9828 CurContext->addDecl(Friend); 9829 return Friend; 9830} 9831 9832 9833/// Handle a friend type declaration. This works in tandem with 9834/// ActOnTag. 9835/// 9836/// Notes on friend class templates: 9837/// 9838/// We generally treat friend class declarations as if they were 9839/// declaring a class. So, for example, the elaborated type specifier 9840/// in a friend declaration is required to obey the restrictions of a 9841/// class-head (i.e. no typedefs in the scope chain), template 9842/// parameters are required to match up with simple template-ids, &c. 9843/// However, unlike when declaring a template specialization, it's 9844/// okay to refer to a template specialization without an empty 9845/// template parameter declaration, e.g. 9846/// friend class A<T>::B<unsigned>; 9847/// We permit this as a special case; if there are any template 9848/// parameters present at all, require proper matching, i.e. 9849/// template <> template <class T> friend class A<int>::B; 9850Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9851 MultiTemplateParamsArg TempParams) { 9852 SourceLocation Loc = DS.getSourceRange().getBegin(); 9853 9854 assert(DS.isFriendSpecified()); 9855 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9856 9857 // Try to convert the decl specifier to a type. This works for 9858 // friend templates because ActOnTag never produces a ClassTemplateDecl 9859 // for a TUK_Friend. 9860 Declarator TheDeclarator(DS, Declarator::MemberContext); 9861 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9862 QualType T = TSI->getType(); 9863 if (TheDeclarator.isInvalidType()) 9864 return 0; 9865 9866 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9867 return 0; 9868 9869 // This is definitely an error in C++98. It's probably meant to 9870 // be forbidden in C++0x, too, but the specification is just 9871 // poorly written. 9872 // 9873 // The problem is with declarations like the following: 9874 // template <T> friend A<T>::foo; 9875 // where deciding whether a class C is a friend or not now hinges 9876 // on whether there exists an instantiation of A that causes 9877 // 'foo' to equal C. There are restrictions on class-heads 9878 // (which we declare (by fiat) elaborated friend declarations to 9879 // be) that makes this tractable. 9880 // 9881 // FIXME: handle "template <> friend class A<T>;", which 9882 // is possibly well-formed? Who even knows? 9883 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9884 Diag(Loc, diag::err_tagless_friend_type_template) 9885 << DS.getSourceRange(); 9886 return 0; 9887 } 9888 9889 // C++98 [class.friend]p1: A friend of a class is a function 9890 // or class that is not a member of the class . . . 9891 // This is fixed in DR77, which just barely didn't make the C++03 9892 // deadline. It's also a very silly restriction that seriously 9893 // affects inner classes and which nobody else seems to implement; 9894 // thus we never diagnose it, not even in -pedantic. 9895 // 9896 // But note that we could warn about it: it's always useless to 9897 // friend one of your own members (it's not, however, worthless to 9898 // friend a member of an arbitrary specialization of your template). 9899 9900 Decl *D; 9901 if (unsigned NumTempParamLists = TempParams.size()) 9902 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9903 NumTempParamLists, 9904 TempParams.release(), 9905 TSI, 9906 DS.getFriendSpecLoc()); 9907 else 9908 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9909 9910 if (!D) 9911 return 0; 9912 9913 D->setAccess(AS_public); 9914 CurContext->addDecl(D); 9915 9916 return D; 9917} 9918 9919Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9920 MultiTemplateParamsArg TemplateParams) { 9921 const DeclSpec &DS = D.getDeclSpec(); 9922 9923 assert(DS.isFriendSpecified()); 9924 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9925 9926 SourceLocation Loc = D.getIdentifierLoc(); 9927 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9928 9929 // C++ [class.friend]p1 9930 // A friend of a class is a function or class.... 9931 // Note that this sees through typedefs, which is intended. 9932 // It *doesn't* see through dependent types, which is correct 9933 // according to [temp.arg.type]p3: 9934 // If a declaration acquires a function type through a 9935 // type dependent on a template-parameter and this causes 9936 // a declaration that does not use the syntactic form of a 9937 // function declarator to have a function type, the program 9938 // is ill-formed. 9939 if (!TInfo->getType()->isFunctionType()) { 9940 Diag(Loc, diag::err_unexpected_friend); 9941 9942 // It might be worthwhile to try to recover by creating an 9943 // appropriate declaration. 9944 return 0; 9945 } 9946 9947 // C++ [namespace.memdef]p3 9948 // - If a friend declaration in a non-local class first declares a 9949 // class or function, the friend class or function is a member 9950 // of the innermost enclosing namespace. 9951 // - The name of the friend is not found by simple name lookup 9952 // until a matching declaration is provided in that namespace 9953 // scope (either before or after the class declaration granting 9954 // friendship). 9955 // - If a friend function is called, its name may be found by the 9956 // name lookup that considers functions from namespaces and 9957 // classes associated with the types of the function arguments. 9958 // - When looking for a prior declaration of a class or a function 9959 // declared as a friend, scopes outside the innermost enclosing 9960 // namespace scope are not considered. 9961 9962 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9963 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9964 DeclarationName Name = NameInfo.getName(); 9965 assert(Name); 9966 9967 // Check for unexpanded parameter packs. 9968 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9969 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9970 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9971 return 0; 9972 9973 // The context we found the declaration in, or in which we should 9974 // create the declaration. 9975 DeclContext *DC; 9976 Scope *DCScope = S; 9977 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9978 ForRedeclaration); 9979 9980 // FIXME: there are different rules in local classes 9981 9982 // There are four cases here. 9983 // - There's no scope specifier, in which case we just go to the 9984 // appropriate scope and look for a function or function template 9985 // there as appropriate. 9986 // Recover from invalid scope qualifiers as if they just weren't there. 9987 if (SS.isInvalid() || !SS.isSet()) { 9988 // C++0x [namespace.memdef]p3: 9989 // If the name in a friend declaration is neither qualified nor 9990 // a template-id and the declaration is a function or an 9991 // elaborated-type-specifier, the lookup to determine whether 9992 // the entity has been previously declared shall not consider 9993 // any scopes outside the innermost enclosing namespace. 9994 // C++0x [class.friend]p11: 9995 // If a friend declaration appears in a local class and the name 9996 // specified is an unqualified name, a prior declaration is 9997 // looked up without considering scopes that are outside the 9998 // innermost enclosing non-class scope. For a friend function 9999 // declaration, if there is no prior declaration, the program is 10000 // ill-formed. 10001 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10002 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10003 10004 // Find the appropriate context according to the above. 10005 DC = CurContext; 10006 while (true) { 10007 // Skip class contexts. If someone can cite chapter and verse 10008 // for this behavior, that would be nice --- it's what GCC and 10009 // EDG do, and it seems like a reasonable intent, but the spec 10010 // really only says that checks for unqualified existing 10011 // declarations should stop at the nearest enclosing namespace, 10012 // not that they should only consider the nearest enclosing 10013 // namespace. 10014 while (DC->isRecord()) 10015 DC = DC->getParent(); 10016 10017 LookupQualifiedName(Previous, DC); 10018 10019 // TODO: decide what we think about using declarations. 10020 if (isLocal || !Previous.empty()) 10021 break; 10022 10023 if (isTemplateId) { 10024 if (isa<TranslationUnitDecl>(DC)) break; 10025 } else { 10026 if (DC->isFileContext()) break; 10027 } 10028 DC = DC->getParent(); 10029 } 10030 10031 // C++ [class.friend]p1: A friend of a class is a function or 10032 // class that is not a member of the class . . . 10033 // C++11 changes this for both friend types and functions. 10034 // Most C++ 98 compilers do seem to give an error here, so 10035 // we do, too. 10036 if (!Previous.empty() && DC->Equals(CurContext)) 10037 Diag(DS.getFriendSpecLoc(), 10038 getLangOptions().CPlusPlus0x ? 10039 diag::warn_cxx98_compat_friend_is_member : 10040 diag::err_friend_is_member); 10041 10042 DCScope = getScopeForDeclContext(S, DC); 10043 10044 // C++ [class.friend]p6: 10045 // A function can be defined in a friend declaration of a class if and 10046 // only if the class is a non-local class (9.8), the function name is 10047 // unqualified, and the function has namespace scope. 10048 if (isLocal && D.isFunctionDefinition()) { 10049 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10050 } 10051 10052 // - There's a non-dependent scope specifier, in which case we 10053 // compute it and do a previous lookup there for a function 10054 // or function template. 10055 } else if (!SS.getScopeRep()->isDependent()) { 10056 DC = computeDeclContext(SS); 10057 if (!DC) return 0; 10058 10059 if (RequireCompleteDeclContext(SS, DC)) return 0; 10060 10061 LookupQualifiedName(Previous, DC); 10062 10063 // Ignore things found implicitly in the wrong scope. 10064 // TODO: better diagnostics for this case. Suggesting the right 10065 // qualified scope would be nice... 10066 LookupResult::Filter F = Previous.makeFilter(); 10067 while (F.hasNext()) { 10068 NamedDecl *D = F.next(); 10069 if (!DC->InEnclosingNamespaceSetOf( 10070 D->getDeclContext()->getRedeclContext())) 10071 F.erase(); 10072 } 10073 F.done(); 10074 10075 if (Previous.empty()) { 10076 D.setInvalidType(); 10077 Diag(Loc, diag::err_qualified_friend_not_found) 10078 << Name << TInfo->getType(); 10079 return 0; 10080 } 10081 10082 // C++ [class.friend]p1: A friend of a class is a function or 10083 // class that is not a member of the class . . . 10084 if (DC->Equals(CurContext)) 10085 Diag(DS.getFriendSpecLoc(), 10086 getLangOptions().CPlusPlus0x ? 10087 diag::warn_cxx98_compat_friend_is_member : 10088 diag::err_friend_is_member); 10089 10090 if (D.isFunctionDefinition()) { 10091 // C++ [class.friend]p6: 10092 // A function can be defined in a friend declaration of a class if and 10093 // only if the class is a non-local class (9.8), the function name is 10094 // unqualified, and the function has namespace scope. 10095 SemaDiagnosticBuilder DB 10096 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10097 10098 DB << SS.getScopeRep(); 10099 if (DC->isFileContext()) 10100 DB << FixItHint::CreateRemoval(SS.getRange()); 10101 SS.clear(); 10102 } 10103 10104 // - There's a scope specifier that does not match any template 10105 // parameter lists, in which case we use some arbitrary context, 10106 // create a method or method template, and wait for instantiation. 10107 // - There's a scope specifier that does match some template 10108 // parameter lists, which we don't handle right now. 10109 } else { 10110 if (D.isFunctionDefinition()) { 10111 // C++ [class.friend]p6: 10112 // A function can be defined in a friend declaration of a class if and 10113 // only if the class is a non-local class (9.8), the function name is 10114 // unqualified, and the function has namespace scope. 10115 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10116 << SS.getScopeRep(); 10117 } 10118 10119 DC = CurContext; 10120 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10121 } 10122 10123 if (!DC->isRecord()) { 10124 // This implies that it has to be an operator or function. 10125 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10126 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10127 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10128 Diag(Loc, diag::err_introducing_special_friend) << 10129 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10130 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10131 return 0; 10132 } 10133 } 10134 10135 // FIXME: This is an egregious hack to cope with cases where the scope stack 10136 // does not contain the declaration context, i.e., in an out-of-line 10137 // definition of a class. 10138 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10139 if (!DCScope) { 10140 FakeDCScope.setEntity(DC); 10141 DCScope = &FakeDCScope; 10142 } 10143 10144 bool AddToScope = true; 10145 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10146 move(TemplateParams), AddToScope); 10147 if (!ND) return 0; 10148 10149 assert(ND->getDeclContext() == DC); 10150 assert(ND->getLexicalDeclContext() == CurContext); 10151 10152 // Add the function declaration to the appropriate lookup tables, 10153 // adjusting the redeclarations list as necessary. We don't 10154 // want to do this yet if the friending class is dependent. 10155 // 10156 // Also update the scope-based lookup if the target context's 10157 // lookup context is in lexical scope. 10158 if (!CurContext->isDependentContext()) { 10159 DC = DC->getRedeclContext(); 10160 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10161 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10162 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10163 } 10164 10165 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10166 D.getIdentifierLoc(), ND, 10167 DS.getFriendSpecLoc()); 10168 FrD->setAccess(AS_public); 10169 CurContext->addDecl(FrD); 10170 10171 if (ND->isInvalidDecl()) 10172 FrD->setInvalidDecl(); 10173 else { 10174 FunctionDecl *FD; 10175 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10176 FD = FTD->getTemplatedDecl(); 10177 else 10178 FD = cast<FunctionDecl>(ND); 10179 10180 // Mark templated-scope function declarations as unsupported. 10181 if (FD->getNumTemplateParameterLists()) 10182 FrD->setUnsupportedFriend(true); 10183 } 10184 10185 return ND; 10186} 10187 10188void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10189 AdjustDeclIfTemplate(Dcl); 10190 10191 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10192 if (!Fn) { 10193 Diag(DelLoc, diag::err_deleted_non_function); 10194 return; 10195 } 10196 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10197 Diag(DelLoc, diag::err_deleted_decl_not_first); 10198 Diag(Prev->getLocation(), diag::note_previous_declaration); 10199 // If the declaration wasn't the first, we delete the function anyway for 10200 // recovery. 10201 } 10202 Fn->setDeletedAsWritten(); 10203} 10204 10205void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10206 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10207 10208 if (MD) { 10209 if (MD->getParent()->isDependentType()) { 10210 MD->setDefaulted(); 10211 MD->setExplicitlyDefaulted(); 10212 return; 10213 } 10214 10215 CXXSpecialMember Member = getSpecialMember(MD); 10216 if (Member == CXXInvalid) { 10217 Diag(DefaultLoc, diag::err_default_special_members); 10218 return; 10219 } 10220 10221 MD->setDefaulted(); 10222 MD->setExplicitlyDefaulted(); 10223 10224 // If this definition appears within the record, do the checking when 10225 // the record is complete. 10226 const FunctionDecl *Primary = MD; 10227 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10228 // Find the uninstantiated declaration that actually had the '= default' 10229 // on it. 10230 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10231 10232 if (Primary == Primary->getCanonicalDecl()) 10233 return; 10234 10235 switch (Member) { 10236 case CXXDefaultConstructor: { 10237 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10238 CheckExplicitlyDefaultedDefaultConstructor(CD); 10239 if (!CD->isInvalidDecl()) 10240 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10241 break; 10242 } 10243 10244 case CXXCopyConstructor: { 10245 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10246 CheckExplicitlyDefaultedCopyConstructor(CD); 10247 if (!CD->isInvalidDecl()) 10248 DefineImplicitCopyConstructor(DefaultLoc, CD); 10249 break; 10250 } 10251 10252 case CXXCopyAssignment: { 10253 CheckExplicitlyDefaultedCopyAssignment(MD); 10254 if (!MD->isInvalidDecl()) 10255 DefineImplicitCopyAssignment(DefaultLoc, MD); 10256 break; 10257 } 10258 10259 case CXXDestructor: { 10260 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10261 CheckExplicitlyDefaultedDestructor(DD); 10262 if (!DD->isInvalidDecl()) 10263 DefineImplicitDestructor(DefaultLoc, DD); 10264 break; 10265 } 10266 10267 case CXXMoveConstructor: { 10268 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10269 CheckExplicitlyDefaultedMoveConstructor(CD); 10270 if (!CD->isInvalidDecl()) 10271 DefineImplicitMoveConstructor(DefaultLoc, CD); 10272 break; 10273 } 10274 10275 case CXXMoveAssignment: { 10276 CheckExplicitlyDefaultedMoveAssignment(MD); 10277 if (!MD->isInvalidDecl()) 10278 DefineImplicitMoveAssignment(DefaultLoc, MD); 10279 break; 10280 } 10281 10282 case CXXInvalid: 10283 llvm_unreachable("Invalid special member."); 10284 } 10285 } else { 10286 Diag(DefaultLoc, diag::err_default_special_members); 10287 } 10288} 10289 10290static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10291 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10292 Stmt *SubStmt = *CI; 10293 if (!SubStmt) 10294 continue; 10295 if (isa<ReturnStmt>(SubStmt)) 10296 Self.Diag(SubStmt->getSourceRange().getBegin(), 10297 diag::err_return_in_constructor_handler); 10298 if (!isa<Expr>(SubStmt)) 10299 SearchForReturnInStmt(Self, SubStmt); 10300 } 10301} 10302 10303void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10304 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10305 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10306 SearchForReturnInStmt(*this, Handler); 10307 } 10308} 10309 10310bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10311 const CXXMethodDecl *Old) { 10312 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10313 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10314 10315 if (Context.hasSameType(NewTy, OldTy) || 10316 NewTy->isDependentType() || OldTy->isDependentType()) 10317 return false; 10318 10319 // Check if the return types are covariant 10320 QualType NewClassTy, OldClassTy; 10321 10322 /// Both types must be pointers or references to classes. 10323 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10324 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10325 NewClassTy = NewPT->getPointeeType(); 10326 OldClassTy = OldPT->getPointeeType(); 10327 } 10328 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10329 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10330 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10331 NewClassTy = NewRT->getPointeeType(); 10332 OldClassTy = OldRT->getPointeeType(); 10333 } 10334 } 10335 } 10336 10337 // The return types aren't either both pointers or references to a class type. 10338 if (NewClassTy.isNull()) { 10339 Diag(New->getLocation(), 10340 diag::err_different_return_type_for_overriding_virtual_function) 10341 << New->getDeclName() << NewTy << OldTy; 10342 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10343 10344 return true; 10345 } 10346 10347 // C++ [class.virtual]p6: 10348 // If the return type of D::f differs from the return type of B::f, the 10349 // class type in the return type of D::f shall be complete at the point of 10350 // declaration of D::f or shall be the class type D. 10351 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10352 if (!RT->isBeingDefined() && 10353 RequireCompleteType(New->getLocation(), NewClassTy, 10354 PDiag(diag::err_covariant_return_incomplete) 10355 << New->getDeclName())) 10356 return true; 10357 } 10358 10359 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10360 // Check if the new class derives from the old class. 10361 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10362 Diag(New->getLocation(), 10363 diag::err_covariant_return_not_derived) 10364 << New->getDeclName() << NewTy << OldTy; 10365 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10366 return true; 10367 } 10368 10369 // Check if we the conversion from derived to base is valid. 10370 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10371 diag::err_covariant_return_inaccessible_base, 10372 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10373 // FIXME: Should this point to the return type? 10374 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10375 // FIXME: this note won't trigger for delayed access control 10376 // diagnostics, and it's impossible to get an undelayed error 10377 // here from access control during the original parse because 10378 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10379 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10380 return true; 10381 } 10382 } 10383 10384 // The qualifiers of the return types must be the same. 10385 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10386 Diag(New->getLocation(), 10387 diag::err_covariant_return_type_different_qualifications) 10388 << New->getDeclName() << NewTy << OldTy; 10389 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10390 return true; 10391 }; 10392 10393 10394 // The new class type must have the same or less qualifiers as the old type. 10395 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10396 Diag(New->getLocation(), 10397 diag::err_covariant_return_type_class_type_more_qualified) 10398 << New->getDeclName() << NewTy << OldTy; 10399 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10400 return true; 10401 }; 10402 10403 return false; 10404} 10405 10406/// \brief Mark the given method pure. 10407/// 10408/// \param Method the method to be marked pure. 10409/// 10410/// \param InitRange the source range that covers the "0" initializer. 10411bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10412 SourceLocation EndLoc = InitRange.getEnd(); 10413 if (EndLoc.isValid()) 10414 Method->setRangeEnd(EndLoc); 10415 10416 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10417 Method->setPure(); 10418 return false; 10419 } 10420 10421 if (!Method->isInvalidDecl()) 10422 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10423 << Method->getDeclName() << InitRange; 10424 return true; 10425} 10426 10427/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10428/// an initializer for the out-of-line declaration 'Dcl'. The scope 10429/// is a fresh scope pushed for just this purpose. 10430/// 10431/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10432/// static data member of class X, names should be looked up in the scope of 10433/// class X. 10434void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10435 // If there is no declaration, there was an error parsing it. 10436 if (D == 0 || D->isInvalidDecl()) return; 10437 10438 // We should only get called for declarations with scope specifiers, like: 10439 // int foo::bar; 10440 assert(D->isOutOfLine()); 10441 EnterDeclaratorContext(S, D->getDeclContext()); 10442} 10443 10444/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10445/// initializer for the out-of-line declaration 'D'. 10446void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10447 // If there is no declaration, there was an error parsing it. 10448 if (D == 0 || D->isInvalidDecl()) return; 10449 10450 assert(D->isOutOfLine()); 10451 ExitDeclaratorContext(S); 10452} 10453 10454/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10455/// C++ if/switch/while/for statement. 10456/// e.g: "if (int x = f()) {...}" 10457DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10458 // C++ 6.4p2: 10459 // The declarator shall not specify a function or an array. 10460 // The type-specifier-seq shall not contain typedef and shall not declare a 10461 // new class or enumeration. 10462 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10463 "Parser allowed 'typedef' as storage class of condition decl."); 10464 10465 Decl *Dcl = ActOnDeclarator(S, D); 10466 if (!Dcl) 10467 return true; 10468 10469 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10470 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10471 << D.getSourceRange(); 10472 return true; 10473 } 10474 10475 return Dcl; 10476} 10477 10478void Sema::LoadExternalVTableUses() { 10479 if (!ExternalSource) 10480 return; 10481 10482 SmallVector<ExternalVTableUse, 4> VTables; 10483 ExternalSource->ReadUsedVTables(VTables); 10484 SmallVector<VTableUse, 4> NewUses; 10485 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10486 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10487 = VTablesUsed.find(VTables[I].Record); 10488 // Even if a definition wasn't required before, it may be required now. 10489 if (Pos != VTablesUsed.end()) { 10490 if (!Pos->second && VTables[I].DefinitionRequired) 10491 Pos->second = true; 10492 continue; 10493 } 10494 10495 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10496 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10497 } 10498 10499 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10500} 10501 10502void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10503 bool DefinitionRequired) { 10504 // Ignore any vtable uses in unevaluated operands or for classes that do 10505 // not have a vtable. 10506 if (!Class->isDynamicClass() || Class->isDependentContext() || 10507 CurContext->isDependentContext() || 10508 ExprEvalContexts.back().Context == Unevaluated) 10509 return; 10510 10511 // Try to insert this class into the map. 10512 LoadExternalVTableUses(); 10513 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10514 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10515 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10516 if (!Pos.second) { 10517 // If we already had an entry, check to see if we are promoting this vtable 10518 // to required a definition. If so, we need to reappend to the VTableUses 10519 // list, since we may have already processed the first entry. 10520 if (DefinitionRequired && !Pos.first->second) { 10521 Pos.first->second = true; 10522 } else { 10523 // Otherwise, we can early exit. 10524 return; 10525 } 10526 } 10527 10528 // Local classes need to have their virtual members marked 10529 // immediately. For all other classes, we mark their virtual members 10530 // at the end of the translation unit. 10531 if (Class->isLocalClass()) 10532 MarkVirtualMembersReferenced(Loc, Class); 10533 else 10534 VTableUses.push_back(std::make_pair(Class, Loc)); 10535} 10536 10537bool Sema::DefineUsedVTables() { 10538 LoadExternalVTableUses(); 10539 if (VTableUses.empty()) 10540 return false; 10541 10542 // Note: The VTableUses vector could grow as a result of marking 10543 // the members of a class as "used", so we check the size each 10544 // time through the loop and prefer indices (with are stable) to 10545 // iterators (which are not). 10546 bool DefinedAnything = false; 10547 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10548 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10549 if (!Class) 10550 continue; 10551 10552 SourceLocation Loc = VTableUses[I].second; 10553 10554 // If this class has a key function, but that key function is 10555 // defined in another translation unit, we don't need to emit the 10556 // vtable even though we're using it. 10557 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10558 if (KeyFunction && !KeyFunction->hasBody()) { 10559 switch (KeyFunction->getTemplateSpecializationKind()) { 10560 case TSK_Undeclared: 10561 case TSK_ExplicitSpecialization: 10562 case TSK_ExplicitInstantiationDeclaration: 10563 // The key function is in another translation unit. 10564 continue; 10565 10566 case TSK_ExplicitInstantiationDefinition: 10567 case TSK_ImplicitInstantiation: 10568 // We will be instantiating the key function. 10569 break; 10570 } 10571 } else if (!KeyFunction) { 10572 // If we have a class with no key function that is the subject 10573 // of an explicit instantiation declaration, suppress the 10574 // vtable; it will live with the explicit instantiation 10575 // definition. 10576 bool IsExplicitInstantiationDeclaration 10577 = Class->getTemplateSpecializationKind() 10578 == TSK_ExplicitInstantiationDeclaration; 10579 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10580 REnd = Class->redecls_end(); 10581 R != REnd; ++R) { 10582 TemplateSpecializationKind TSK 10583 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10584 if (TSK == TSK_ExplicitInstantiationDeclaration) 10585 IsExplicitInstantiationDeclaration = true; 10586 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10587 IsExplicitInstantiationDeclaration = false; 10588 break; 10589 } 10590 } 10591 10592 if (IsExplicitInstantiationDeclaration) 10593 continue; 10594 } 10595 10596 // Mark all of the virtual members of this class as referenced, so 10597 // that we can build a vtable. Then, tell the AST consumer that a 10598 // vtable for this class is required. 10599 DefinedAnything = true; 10600 MarkVirtualMembersReferenced(Loc, Class); 10601 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10602 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10603 10604 // Optionally warn if we're emitting a weak vtable. 10605 if (Class->getLinkage() == ExternalLinkage && 10606 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10607 const FunctionDecl *KeyFunctionDef = 0; 10608 if (!KeyFunction || 10609 (KeyFunction->hasBody(KeyFunctionDef) && 10610 KeyFunctionDef->isInlined())) 10611 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10612 } 10613 } 10614 VTableUses.clear(); 10615 10616 return DefinedAnything; 10617} 10618 10619void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10620 const CXXRecordDecl *RD) { 10621 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10622 e = RD->method_end(); i != e; ++i) { 10623 CXXMethodDecl *MD = *i; 10624 10625 // C++ [basic.def.odr]p2: 10626 // [...] A virtual member function is used if it is not pure. [...] 10627 if (MD->isVirtual() && !MD->isPure()) 10628 MarkDeclarationReferenced(Loc, MD); 10629 } 10630 10631 // Only classes that have virtual bases need a VTT. 10632 if (RD->getNumVBases() == 0) 10633 return; 10634 10635 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10636 e = RD->bases_end(); i != e; ++i) { 10637 const CXXRecordDecl *Base = 10638 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10639 if (Base->getNumVBases() == 0) 10640 continue; 10641 MarkVirtualMembersReferenced(Loc, Base); 10642 } 10643} 10644 10645/// SetIvarInitializers - This routine builds initialization ASTs for the 10646/// Objective-C implementation whose ivars need be initialized. 10647void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10648 if (!getLangOptions().CPlusPlus) 10649 return; 10650 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10651 SmallVector<ObjCIvarDecl*, 8> ivars; 10652 CollectIvarsToConstructOrDestruct(OID, ivars); 10653 if (ivars.empty()) 10654 return; 10655 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10656 for (unsigned i = 0; i < ivars.size(); i++) { 10657 FieldDecl *Field = ivars[i]; 10658 if (Field->isInvalidDecl()) 10659 continue; 10660 10661 CXXCtorInitializer *Member; 10662 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10663 InitializationKind InitKind = 10664 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10665 10666 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10667 ExprResult MemberInit = 10668 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10669 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10670 // Note, MemberInit could actually come back empty if no initialization 10671 // is required (e.g., because it would call a trivial default constructor) 10672 if (!MemberInit.get() || MemberInit.isInvalid()) 10673 continue; 10674 10675 Member = 10676 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10677 SourceLocation(), 10678 MemberInit.takeAs<Expr>(), 10679 SourceLocation()); 10680 AllToInit.push_back(Member); 10681 10682 // Be sure that the destructor is accessible and is marked as referenced. 10683 if (const RecordType *RecordTy 10684 = Context.getBaseElementType(Field->getType()) 10685 ->getAs<RecordType>()) { 10686 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10687 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10688 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10689 CheckDestructorAccess(Field->getLocation(), Destructor, 10690 PDiag(diag::err_access_dtor_ivar) 10691 << Context.getBaseElementType(Field->getType())); 10692 } 10693 } 10694 } 10695 ObjCImplementation->setIvarInitializers(Context, 10696 AllToInit.data(), AllToInit.size()); 10697 } 10698} 10699 10700static 10701void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10702 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10703 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10704 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10705 Sema &S) { 10706 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10707 CE = Current.end(); 10708 if (Ctor->isInvalidDecl()) 10709 return; 10710 10711 const FunctionDecl *FNTarget = 0; 10712 CXXConstructorDecl *Target; 10713 10714 // We ignore the result here since if we don't have a body, Target will be 10715 // null below. 10716 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10717 Target 10718= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10719 10720 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10721 // Avoid dereferencing a null pointer here. 10722 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10723 10724 if (!Current.insert(Canonical)) 10725 return; 10726 10727 // We know that beyond here, we aren't chaining into a cycle. 10728 if (!Target || !Target->isDelegatingConstructor() || 10729 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10730 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10731 Valid.insert(*CI); 10732 Current.clear(); 10733 // We've hit a cycle. 10734 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10735 Current.count(TCanonical)) { 10736 // If we haven't diagnosed this cycle yet, do so now. 10737 if (!Invalid.count(TCanonical)) { 10738 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10739 diag::warn_delegating_ctor_cycle) 10740 << Ctor; 10741 10742 // Don't add a note for a function delegating directo to itself. 10743 if (TCanonical != Canonical) 10744 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10745 10746 CXXConstructorDecl *C = Target; 10747 while (C->getCanonicalDecl() != Canonical) { 10748 (void)C->getTargetConstructor()->hasBody(FNTarget); 10749 assert(FNTarget && "Ctor cycle through bodiless function"); 10750 10751 C 10752 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10753 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10754 } 10755 } 10756 10757 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10758 Invalid.insert(*CI); 10759 Current.clear(); 10760 } else { 10761 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10762 } 10763} 10764 10765 10766void Sema::CheckDelegatingCtorCycles() { 10767 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10768 10769 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10770 CE = Current.end(); 10771 10772 for (DelegatingCtorDeclsType::iterator 10773 I = DelegatingCtorDecls.begin(ExternalSource), 10774 E = DelegatingCtorDecls.end(); 10775 I != E; ++I) { 10776 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10777 } 10778 10779 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10780 (*CI)->setInvalidDecl(); 10781} 10782 10783/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10784Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10785 // Implicitly declared functions (e.g. copy constructors) are 10786 // __host__ __device__ 10787 if (D->isImplicit()) 10788 return CFT_HostDevice; 10789 10790 if (D->hasAttr<CUDAGlobalAttr>()) 10791 return CFT_Global; 10792 10793 if (D->hasAttr<CUDADeviceAttr>()) { 10794 if (D->hasAttr<CUDAHostAttr>()) 10795 return CFT_HostDevice; 10796 else 10797 return CFT_Device; 10798 } 10799 10800 return CFT_Host; 10801} 10802 10803bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10804 CUDAFunctionTarget CalleeTarget) { 10805 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10806 // Callable from the device only." 10807 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10808 return true; 10809 10810 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10811 // Callable from the host only." 10812 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10813 // Callable from the host only." 10814 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10815 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10816 return true; 10817 10818 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10819 return true; 10820 10821 return false; 10822} 10823