SemaDeclCXX.cpp revision e16da07474c376fbbeda2d4238cf35e2bd664d5a
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 (!Inits.count(Field)) { 814 if (!Diagnosed) { 815 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 816 Diagnosed = true; 817 } 818 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 819 } else if (Field->isAnonymousStructOrUnion()) { 820 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 821 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 822 I != E; ++I) 823 // If an anonymous union contains an anonymous struct of which any member 824 // is initialized, all members must be initialized. 825 if (!RD->isUnion() || Inits.count(*I)) 826 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 827 } 828} 829 830/// Check the body for the given constexpr function declaration only contains 831/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 832/// 833/// \return true if the body is OK, false if we have diagnosed a problem. 834bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 835 if (isa<CXXTryStmt>(Body)) { 836 // C++0x [dcl.constexpr]p3: 837 // The definition of a constexpr function shall satisfy the following 838 // constraints: [...] 839 // - its function-body shall be = delete, = default, or a 840 // compound-statement 841 // 842 // C++0x [dcl.constexpr]p4: 843 // In the definition of a constexpr constructor, [...] 844 // - its function-body shall not be a function-try-block; 845 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 846 << isa<CXXConstructorDecl>(Dcl); 847 return false; 848 } 849 850 // - its function-body shall be [...] a compound-statement that contains only 851 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 852 853 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 854 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 855 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 856 switch ((*BodyIt)->getStmtClass()) { 857 case Stmt::NullStmtClass: 858 // - null statements, 859 continue; 860 861 case Stmt::DeclStmtClass: 862 // - static_assert-declarations 863 // - using-declarations, 864 // - using-directives, 865 // - typedef declarations and alias-declarations that do not define 866 // classes or enumerations, 867 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 868 return false; 869 continue; 870 871 case Stmt::ReturnStmtClass: 872 // - and exactly one return statement; 873 if (isa<CXXConstructorDecl>(Dcl)) 874 break; 875 876 ReturnStmts.push_back((*BodyIt)->getLocStart()); 877 // FIXME 878 // - every constructor call and implicit conversion used in initializing 879 // the return value shall be one of those allowed in a constant 880 // expression. 881 // Deal with this as part of a general check that the function can produce 882 // a constant expression (for [dcl.constexpr]p5). 883 continue; 884 885 default: 886 break; 887 } 888 889 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 890 << isa<CXXConstructorDecl>(Dcl); 891 return false; 892 } 893 894 if (const CXXConstructorDecl *Constructor 895 = dyn_cast<CXXConstructorDecl>(Dcl)) { 896 const CXXRecordDecl *RD = Constructor->getParent(); 897 // - every non-static data member and base class sub-object shall be 898 // initialized; 899 if (RD->isUnion()) { 900 // DR1359: Exactly one member of a union shall be initialized. 901 if (Constructor->getNumCtorInitializers() == 0) { 902 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 903 return false; 904 } 905 } else if (!Constructor->isDelegatingConstructor()) { 906 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 907 908 // Skip detailed checking if we have enough initializers, and we would 909 // allow at most one initializer per member. 910 bool AnyAnonStructUnionMembers = false; 911 unsigned Fields = 0; 912 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 913 E = RD->field_end(); I != E; ++I, ++Fields) { 914 if ((*I)->isAnonymousStructOrUnion()) { 915 AnyAnonStructUnionMembers = true; 916 break; 917 } 918 } 919 if (AnyAnonStructUnionMembers || 920 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 921 // Check initialization of non-static data members. Base classes are 922 // always initialized so do not need to be checked. Dependent bases 923 // might not have initializers in the member initializer list. 924 llvm::SmallSet<Decl*, 16> Inits; 925 for (CXXConstructorDecl::init_const_iterator 926 I = Constructor->init_begin(), E = Constructor->init_end(); 927 I != E; ++I) { 928 if (FieldDecl *FD = (*I)->getMember()) 929 Inits.insert(FD); 930 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 931 Inits.insert(ID->chain_begin(), ID->chain_end()); 932 } 933 934 bool Diagnosed = false; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I) 937 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 938 if (Diagnosed) 939 return false; 940 } 941 } 942 943 // FIXME 944 // - every constructor involved in initializing non-static data members 945 // and base class sub-objects shall be a constexpr constructor; 946 // - every assignment-expression that is an initializer-clause appearing 947 // directly or indirectly within a brace-or-equal-initializer for 948 // a non-static data member that is not named by a mem-initializer-id 949 // shall be a constant expression; and 950 // - every implicit conversion used in converting a constructor argument 951 // to the corresponding parameter type and converting 952 // a full-expression to the corresponding member type shall be one of 953 // those allowed in a constant expression. 954 // Deal with these as part of a general check that the function can produce 955 // a constant expression (for [dcl.constexpr]p5). 956 } else { 957 if (ReturnStmts.empty()) { 958 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 959 return false; 960 } 961 if (ReturnStmts.size() > 1) { 962 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 963 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 964 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 965 return false; 966 } 967 } 968 969 return true; 970} 971 972/// isCurrentClassName - Determine whether the identifier II is the 973/// name of the class type currently being defined. In the case of 974/// nested classes, this will only return true if II is the name of 975/// the innermost class. 976bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 977 const CXXScopeSpec *SS) { 978 assert(getLangOptions().CPlusPlus && "No class names in C!"); 979 980 CXXRecordDecl *CurDecl; 981 if (SS && SS->isSet() && !SS->isInvalid()) { 982 DeclContext *DC = computeDeclContext(*SS, true); 983 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 984 } else 985 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 986 987 if (CurDecl && CurDecl->getIdentifier()) 988 return &II == CurDecl->getIdentifier(); 989 else 990 return false; 991} 992 993/// \brief Check the validity of a C++ base class specifier. 994/// 995/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 996/// and returns NULL otherwise. 997CXXBaseSpecifier * 998Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 999 SourceRange SpecifierRange, 1000 bool Virtual, AccessSpecifier Access, 1001 TypeSourceInfo *TInfo, 1002 SourceLocation EllipsisLoc) { 1003 QualType BaseType = TInfo->getType(); 1004 1005 // C++ [class.union]p1: 1006 // A union shall not have base classes. 1007 if (Class->isUnion()) { 1008 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1009 << SpecifierRange; 1010 return 0; 1011 } 1012 1013 if (EllipsisLoc.isValid() && 1014 !TInfo->getType()->containsUnexpandedParameterPack()) { 1015 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1016 << TInfo->getTypeLoc().getSourceRange(); 1017 EllipsisLoc = SourceLocation(); 1018 } 1019 1020 if (BaseType->isDependentType()) 1021 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1022 Class->getTagKind() == TTK_Class, 1023 Access, TInfo, EllipsisLoc); 1024 1025 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1026 1027 // Base specifiers must be record types. 1028 if (!BaseType->isRecordType()) { 1029 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1030 return 0; 1031 } 1032 1033 // C++ [class.union]p1: 1034 // A union shall not be used as a base class. 1035 if (BaseType->isUnionType()) { 1036 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1037 return 0; 1038 } 1039 1040 // C++ [class.derived]p2: 1041 // The class-name in a base-specifier shall not be an incompletely 1042 // defined class. 1043 if (RequireCompleteType(BaseLoc, BaseType, 1044 PDiag(diag::err_incomplete_base_class) 1045 << SpecifierRange)) { 1046 Class->setInvalidDecl(); 1047 return 0; 1048 } 1049 1050 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1051 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1052 assert(BaseDecl && "Record type has no declaration"); 1053 BaseDecl = BaseDecl->getDefinition(); 1054 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1055 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1056 assert(CXXBaseDecl && "Base type is not a C++ type"); 1057 1058 // C++ [class]p3: 1059 // If a class is marked final and it appears as a base-type-specifier in 1060 // base-clause, the program is ill-formed. 1061 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1062 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1063 << CXXBaseDecl->getDeclName(); 1064 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1065 << CXXBaseDecl->getDeclName(); 1066 return 0; 1067 } 1068 1069 if (BaseDecl->isInvalidDecl()) 1070 Class->setInvalidDecl(); 1071 1072 // Create the base specifier. 1073 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1074 Class->getTagKind() == TTK_Class, 1075 Access, TInfo, EllipsisLoc); 1076} 1077 1078/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1079/// one entry in the base class list of a class specifier, for 1080/// example: 1081/// class foo : public bar, virtual private baz { 1082/// 'public bar' and 'virtual private baz' are each base-specifiers. 1083BaseResult 1084Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1085 bool Virtual, AccessSpecifier Access, 1086 ParsedType basetype, SourceLocation BaseLoc, 1087 SourceLocation EllipsisLoc) { 1088 if (!classdecl) 1089 return true; 1090 1091 AdjustDeclIfTemplate(classdecl); 1092 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1093 if (!Class) 1094 return true; 1095 1096 TypeSourceInfo *TInfo = 0; 1097 GetTypeFromParser(basetype, &TInfo); 1098 1099 if (EllipsisLoc.isInvalid() && 1100 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1101 UPPC_BaseType)) 1102 return true; 1103 1104 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1105 Virtual, Access, TInfo, 1106 EllipsisLoc)) 1107 return BaseSpec; 1108 1109 return true; 1110} 1111 1112/// \brief Performs the actual work of attaching the given base class 1113/// specifiers to a C++ class. 1114bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1115 unsigned NumBases) { 1116 if (NumBases == 0) 1117 return false; 1118 1119 // Used to keep track of which base types we have already seen, so 1120 // that we can properly diagnose redundant direct base types. Note 1121 // that the key is always the unqualified canonical type of the base 1122 // class. 1123 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1124 1125 // Copy non-redundant base specifiers into permanent storage. 1126 unsigned NumGoodBases = 0; 1127 bool Invalid = false; 1128 for (unsigned idx = 0; idx < NumBases; ++idx) { 1129 QualType NewBaseType 1130 = Context.getCanonicalType(Bases[idx]->getType()); 1131 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1132 if (KnownBaseTypes[NewBaseType]) { 1133 // C++ [class.mi]p3: 1134 // A class shall not be specified as a direct base class of a 1135 // derived class more than once. 1136 Diag(Bases[idx]->getSourceRange().getBegin(), 1137 diag::err_duplicate_base_class) 1138 << KnownBaseTypes[NewBaseType]->getType() 1139 << Bases[idx]->getSourceRange(); 1140 1141 // Delete the duplicate base class specifier; we're going to 1142 // overwrite its pointer later. 1143 Context.Deallocate(Bases[idx]); 1144 1145 Invalid = true; 1146 } else { 1147 // Okay, add this new base class. 1148 KnownBaseTypes[NewBaseType] = Bases[idx]; 1149 Bases[NumGoodBases++] = Bases[idx]; 1150 } 1151 } 1152 1153 // Attach the remaining base class specifiers to the derived class. 1154 Class->setBases(Bases, NumGoodBases); 1155 1156 // Delete the remaining (good) base class specifiers, since their 1157 // data has been copied into the CXXRecordDecl. 1158 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1159 Context.Deallocate(Bases[idx]); 1160 1161 return Invalid; 1162} 1163 1164/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1165/// class, after checking whether there are any duplicate base 1166/// classes. 1167void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1168 unsigned NumBases) { 1169 if (!ClassDecl || !Bases || !NumBases) 1170 return; 1171 1172 AdjustDeclIfTemplate(ClassDecl); 1173 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1174 (CXXBaseSpecifier**)(Bases), NumBases); 1175} 1176 1177static CXXRecordDecl *GetClassForType(QualType T) { 1178 if (const RecordType *RT = T->getAs<RecordType>()) 1179 return cast<CXXRecordDecl>(RT->getDecl()); 1180 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1181 return ICT->getDecl(); 1182 else 1183 return 0; 1184} 1185 1186/// \brief Determine whether the type \p Derived is a C++ class that is 1187/// derived from the type \p Base. 1188bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1189 if (!getLangOptions().CPlusPlus) 1190 return false; 1191 1192 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1193 if (!DerivedRD) 1194 return false; 1195 1196 CXXRecordDecl *BaseRD = GetClassForType(Base); 1197 if (!BaseRD) 1198 return false; 1199 1200 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1201 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1202} 1203 1204/// \brief Determine whether the type \p Derived is a C++ class that is 1205/// derived from the type \p Base. 1206bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1207 if (!getLangOptions().CPlusPlus) 1208 return false; 1209 1210 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1211 if (!DerivedRD) 1212 return false; 1213 1214 CXXRecordDecl *BaseRD = GetClassForType(Base); 1215 if (!BaseRD) 1216 return false; 1217 1218 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1219} 1220 1221void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1222 CXXCastPath &BasePathArray) { 1223 assert(BasePathArray.empty() && "Base path array must be empty!"); 1224 assert(Paths.isRecordingPaths() && "Must record paths!"); 1225 1226 const CXXBasePath &Path = Paths.front(); 1227 1228 // We first go backward and check if we have a virtual base. 1229 // FIXME: It would be better if CXXBasePath had the base specifier for 1230 // the nearest virtual base. 1231 unsigned Start = 0; 1232 for (unsigned I = Path.size(); I != 0; --I) { 1233 if (Path[I - 1].Base->isVirtual()) { 1234 Start = I - 1; 1235 break; 1236 } 1237 } 1238 1239 // Now add all bases. 1240 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1241 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1242} 1243 1244/// \brief Determine whether the given base path includes a virtual 1245/// base class. 1246bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1247 for (CXXCastPath::const_iterator B = BasePath.begin(), 1248 BEnd = BasePath.end(); 1249 B != BEnd; ++B) 1250 if ((*B)->isVirtual()) 1251 return true; 1252 1253 return false; 1254} 1255 1256/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1257/// conversion (where Derived and Base are class types) is 1258/// well-formed, meaning that the conversion is unambiguous (and 1259/// that all of the base classes are accessible). Returns true 1260/// and emits a diagnostic if the code is ill-formed, returns false 1261/// otherwise. Loc is the location where this routine should point to 1262/// if there is an error, and Range is the source range to highlight 1263/// if there is an error. 1264bool 1265Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1266 unsigned InaccessibleBaseID, 1267 unsigned AmbigiousBaseConvID, 1268 SourceLocation Loc, SourceRange Range, 1269 DeclarationName Name, 1270 CXXCastPath *BasePath) { 1271 // First, determine whether the path from Derived to Base is 1272 // ambiguous. This is slightly more expensive than checking whether 1273 // the Derived to Base conversion exists, because here we need to 1274 // explore multiple paths to determine if there is an ambiguity. 1275 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1276 /*DetectVirtual=*/false); 1277 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1278 assert(DerivationOkay && 1279 "Can only be used with a derived-to-base conversion"); 1280 (void)DerivationOkay; 1281 1282 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1283 if (InaccessibleBaseID) { 1284 // Check that the base class can be accessed. 1285 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1286 InaccessibleBaseID)) { 1287 case AR_inaccessible: 1288 return true; 1289 case AR_accessible: 1290 case AR_dependent: 1291 case AR_delayed: 1292 break; 1293 } 1294 } 1295 1296 // Build a base path if necessary. 1297 if (BasePath) 1298 BuildBasePathArray(Paths, *BasePath); 1299 return false; 1300 } 1301 1302 // We know that the derived-to-base conversion is ambiguous, and 1303 // we're going to produce a diagnostic. Perform the derived-to-base 1304 // search just one more time to compute all of the possible paths so 1305 // that we can print them out. This is more expensive than any of 1306 // the previous derived-to-base checks we've done, but at this point 1307 // performance isn't as much of an issue. 1308 Paths.clear(); 1309 Paths.setRecordingPaths(true); 1310 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1311 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1312 (void)StillOkay; 1313 1314 // Build up a textual representation of the ambiguous paths, e.g., 1315 // D -> B -> A, that will be used to illustrate the ambiguous 1316 // conversions in the diagnostic. We only print one of the paths 1317 // to each base class subobject. 1318 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1319 1320 Diag(Loc, AmbigiousBaseConvID) 1321 << Derived << Base << PathDisplayStr << Range << Name; 1322 return true; 1323} 1324 1325bool 1326Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1327 SourceLocation Loc, SourceRange Range, 1328 CXXCastPath *BasePath, 1329 bool IgnoreAccess) { 1330 return CheckDerivedToBaseConversion(Derived, Base, 1331 IgnoreAccess ? 0 1332 : diag::err_upcast_to_inaccessible_base, 1333 diag::err_ambiguous_derived_to_base_conv, 1334 Loc, Range, DeclarationName(), 1335 BasePath); 1336} 1337 1338 1339/// @brief Builds a string representing ambiguous paths from a 1340/// specific derived class to different subobjects of the same base 1341/// class. 1342/// 1343/// This function builds a string that can be used in error messages 1344/// to show the different paths that one can take through the 1345/// inheritance hierarchy to go from the derived class to different 1346/// subobjects of a base class. The result looks something like this: 1347/// @code 1348/// struct D -> struct B -> struct A 1349/// struct D -> struct C -> struct A 1350/// @endcode 1351std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1352 std::string PathDisplayStr; 1353 std::set<unsigned> DisplayedPaths; 1354 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1355 Path != Paths.end(); ++Path) { 1356 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1357 // We haven't displayed a path to this particular base 1358 // class subobject yet. 1359 PathDisplayStr += "\n "; 1360 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1361 for (CXXBasePath::const_iterator Element = Path->begin(); 1362 Element != Path->end(); ++Element) 1363 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1364 } 1365 } 1366 1367 return PathDisplayStr; 1368} 1369 1370//===----------------------------------------------------------------------===// 1371// C++ class member Handling 1372//===----------------------------------------------------------------------===// 1373 1374/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1375Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1376 SourceLocation ASLoc, 1377 SourceLocation ColonLoc) { 1378 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1379 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1380 ASLoc, ColonLoc); 1381 CurContext->addHiddenDecl(ASDecl); 1382 return ASDecl; 1383} 1384 1385/// CheckOverrideControl - Check C++0x override control semantics. 1386void Sema::CheckOverrideControl(const Decl *D) { 1387 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1388 if (!MD || !MD->isVirtual()) 1389 return; 1390 1391 if (MD->isDependentContext()) 1392 return; 1393 1394 // C++0x [class.virtual]p3: 1395 // If a virtual function is marked with the virt-specifier override and does 1396 // not override a member function of a base class, 1397 // the program is ill-formed. 1398 bool HasOverriddenMethods = 1399 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1400 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1401 Diag(MD->getLocation(), 1402 diag::err_function_marked_override_not_overriding) 1403 << MD->getDeclName(); 1404 return; 1405 } 1406} 1407 1408/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1409/// function overrides a virtual member function marked 'final', according to 1410/// C++0x [class.virtual]p3. 1411bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1412 const CXXMethodDecl *Old) { 1413 if (!Old->hasAttr<FinalAttr>()) 1414 return false; 1415 1416 Diag(New->getLocation(), diag::err_final_function_overridden) 1417 << New->getDeclName(); 1418 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1419 return true; 1420} 1421 1422/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1423/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1424/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1425/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1426/// present but parsing it has been deferred. 1427Decl * 1428Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1429 MultiTemplateParamsArg TemplateParameterLists, 1430 Expr *BW, const VirtSpecifiers &VS, 1431 Expr *InitExpr, bool HasDeferredInit, 1432 bool IsDefinition) { 1433 const DeclSpec &DS = D.getDeclSpec(); 1434 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1435 DeclarationName Name = NameInfo.getName(); 1436 SourceLocation Loc = NameInfo.getLoc(); 1437 1438 // For anonymous bitfields, the location should point to the type. 1439 if (Loc.isInvalid()) 1440 Loc = D.getSourceRange().getBegin(); 1441 1442 Expr *BitWidth = static_cast<Expr*>(BW); 1443 Expr *Init = static_cast<Expr*>(InitExpr); 1444 1445 assert(isa<CXXRecordDecl>(CurContext)); 1446 assert(!DS.isFriendSpecified()); 1447 assert(!Init || !HasDeferredInit); 1448 1449 bool isFunc = D.isDeclarationOfFunction(); 1450 1451 // C++ 9.2p6: A member shall not be declared to have automatic storage 1452 // duration (auto, register) or with the extern storage-class-specifier. 1453 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1454 // data members and cannot be applied to names declared const or static, 1455 // and cannot be applied to reference members. 1456 switch (DS.getStorageClassSpec()) { 1457 case DeclSpec::SCS_unspecified: 1458 case DeclSpec::SCS_typedef: 1459 case DeclSpec::SCS_static: 1460 // FALL THROUGH. 1461 break; 1462 case DeclSpec::SCS_mutable: 1463 if (isFunc) { 1464 if (DS.getStorageClassSpecLoc().isValid()) 1465 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1466 else 1467 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1468 1469 // FIXME: It would be nicer if the keyword was ignored only for this 1470 // declarator. Otherwise we could get follow-up errors. 1471 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1472 } 1473 break; 1474 default: 1475 if (DS.getStorageClassSpecLoc().isValid()) 1476 Diag(DS.getStorageClassSpecLoc(), 1477 diag::err_storageclass_invalid_for_member); 1478 else 1479 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1480 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1481 } 1482 1483 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1484 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1485 !isFunc); 1486 1487 Decl *Member; 1488 if (isInstField) { 1489 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1490 1491 // Data members must have identifiers for names. 1492 if (Name.getNameKind() != DeclarationName::Identifier) { 1493 Diag(Loc, diag::err_bad_variable_name) 1494 << Name; 1495 return 0; 1496 } 1497 1498 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1499 1500 // Member field could not be with "template" keyword. 1501 // So TemplateParameterLists should be empty in this case. 1502 if (TemplateParameterLists.size()) { 1503 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1504 if (TemplateParams->size()) { 1505 // There is no such thing as a member field template. 1506 Diag(D.getIdentifierLoc(), diag::err_template_member) 1507 << II 1508 << SourceRange(TemplateParams->getTemplateLoc(), 1509 TemplateParams->getRAngleLoc()); 1510 } else { 1511 // There is an extraneous 'template<>' for this member. 1512 Diag(TemplateParams->getTemplateLoc(), 1513 diag::err_template_member_noparams) 1514 << II 1515 << SourceRange(TemplateParams->getTemplateLoc(), 1516 TemplateParams->getRAngleLoc()); 1517 } 1518 return 0; 1519 } 1520 1521 if (SS.isSet() && !SS.isInvalid()) { 1522 // The user provided a superfluous scope specifier inside a class 1523 // definition: 1524 // 1525 // class X { 1526 // int X::member; 1527 // }; 1528 DeclContext *DC = 0; 1529 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1530 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1531 << Name << FixItHint::CreateRemoval(SS.getRange()); 1532 else 1533 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1534 << Name << SS.getRange(); 1535 1536 SS.clear(); 1537 } 1538 1539 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1540 HasDeferredInit, AS); 1541 assert(Member && "HandleField never returns null"); 1542 } else { 1543 assert(!HasDeferredInit); 1544 1545 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1546 if (!Member) { 1547 return 0; 1548 } 1549 1550 // Non-instance-fields can't have a bitfield. 1551 if (BitWidth) { 1552 if (Member->isInvalidDecl()) { 1553 // don't emit another diagnostic. 1554 } else if (isa<VarDecl>(Member)) { 1555 // C++ 9.6p3: A bit-field shall not be a static member. 1556 // "static member 'A' cannot be a bit-field" 1557 Diag(Loc, diag::err_static_not_bitfield) 1558 << Name << BitWidth->getSourceRange(); 1559 } else if (isa<TypedefDecl>(Member)) { 1560 // "typedef member 'x' cannot be a bit-field" 1561 Diag(Loc, diag::err_typedef_not_bitfield) 1562 << Name << BitWidth->getSourceRange(); 1563 } else { 1564 // A function typedef ("typedef int f(); f a;"). 1565 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1566 Diag(Loc, diag::err_not_integral_type_bitfield) 1567 << Name << cast<ValueDecl>(Member)->getType() 1568 << BitWidth->getSourceRange(); 1569 } 1570 1571 BitWidth = 0; 1572 Member->setInvalidDecl(); 1573 } 1574 1575 Member->setAccess(AS); 1576 1577 // If we have declared a member function template, set the access of the 1578 // templated declaration as well. 1579 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1580 FunTmpl->getTemplatedDecl()->setAccess(AS); 1581 } 1582 1583 if (VS.isOverrideSpecified()) { 1584 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1585 if (!MD || !MD->isVirtual()) { 1586 Diag(Member->getLocStart(), 1587 diag::override_keyword_only_allowed_on_virtual_member_functions) 1588 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1589 } else 1590 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1591 } 1592 if (VS.isFinalSpecified()) { 1593 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1594 if (!MD || !MD->isVirtual()) { 1595 Diag(Member->getLocStart(), 1596 diag::override_keyword_only_allowed_on_virtual_member_functions) 1597 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1598 } else 1599 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1600 } 1601 1602 if (VS.getLastLocation().isValid()) { 1603 // Update the end location of a method that has a virt-specifiers. 1604 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1605 MD->setRangeEnd(VS.getLastLocation()); 1606 } 1607 1608 CheckOverrideControl(Member); 1609 1610 assert((Name || isInstField) && "No identifier for non-field ?"); 1611 1612 if (Init) 1613 AddInitializerToDecl(Member, Init, false, 1614 DS.getTypeSpecType() == DeclSpec::TST_auto); 1615 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1616 ActOnUninitializedDecl(Member, DS.getTypeSpecType() == DeclSpec::TST_auto); 1617 1618 FinalizeDeclaration(Member); 1619 1620 if (isInstField) 1621 FieldCollector->Add(cast<FieldDecl>(Member)); 1622 return Member; 1623} 1624 1625/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1626/// in-class initializer for a non-static C++ class member, and after 1627/// instantiating an in-class initializer in a class template. Such actions 1628/// are deferred until the class is complete. 1629void 1630Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1631 Expr *InitExpr) { 1632 FieldDecl *FD = cast<FieldDecl>(D); 1633 1634 if (!InitExpr) { 1635 FD->setInvalidDecl(); 1636 FD->removeInClassInitializer(); 1637 return; 1638 } 1639 1640 ExprResult Init = InitExpr; 1641 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1642 // FIXME: if there is no EqualLoc, this is list-initialization. 1643 Init = PerformCopyInitialization( 1644 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1645 if (Init.isInvalid()) { 1646 FD->setInvalidDecl(); 1647 return; 1648 } 1649 1650 CheckImplicitConversions(Init.get(), EqualLoc); 1651 } 1652 1653 // C++0x [class.base.init]p7: 1654 // The initialization of each base and member constitutes a 1655 // full-expression. 1656 Init = MaybeCreateExprWithCleanups(Init); 1657 if (Init.isInvalid()) { 1658 FD->setInvalidDecl(); 1659 return; 1660 } 1661 1662 InitExpr = Init.release(); 1663 1664 FD->setInClassInitializer(InitExpr); 1665} 1666 1667/// \brief Find the direct and/or virtual base specifiers that 1668/// correspond to the given base type, for use in base initialization 1669/// within a constructor. 1670static bool FindBaseInitializer(Sema &SemaRef, 1671 CXXRecordDecl *ClassDecl, 1672 QualType BaseType, 1673 const CXXBaseSpecifier *&DirectBaseSpec, 1674 const CXXBaseSpecifier *&VirtualBaseSpec) { 1675 // First, check for a direct base class. 1676 DirectBaseSpec = 0; 1677 for (CXXRecordDecl::base_class_const_iterator Base 1678 = ClassDecl->bases_begin(); 1679 Base != ClassDecl->bases_end(); ++Base) { 1680 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1681 // We found a direct base of this type. That's what we're 1682 // initializing. 1683 DirectBaseSpec = &*Base; 1684 break; 1685 } 1686 } 1687 1688 // Check for a virtual base class. 1689 // FIXME: We might be able to short-circuit this if we know in advance that 1690 // there are no virtual bases. 1691 VirtualBaseSpec = 0; 1692 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1693 // We haven't found a base yet; search the class hierarchy for a 1694 // virtual base class. 1695 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1696 /*DetectVirtual=*/false); 1697 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1698 BaseType, Paths)) { 1699 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1700 Path != Paths.end(); ++Path) { 1701 if (Path->back().Base->isVirtual()) { 1702 VirtualBaseSpec = Path->back().Base; 1703 break; 1704 } 1705 } 1706 } 1707 } 1708 1709 return DirectBaseSpec || VirtualBaseSpec; 1710} 1711 1712/// \brief Handle a C++ member initializer using braced-init-list syntax. 1713MemInitResult 1714Sema::ActOnMemInitializer(Decl *ConstructorD, 1715 Scope *S, 1716 CXXScopeSpec &SS, 1717 IdentifierInfo *MemberOrBase, 1718 ParsedType TemplateTypeTy, 1719 SourceLocation IdLoc, 1720 Expr *InitList, 1721 SourceLocation EllipsisLoc) { 1722 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1723 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1724} 1725 1726/// \brief Handle a C++ member initializer using parentheses syntax. 1727MemInitResult 1728Sema::ActOnMemInitializer(Decl *ConstructorD, 1729 Scope *S, 1730 CXXScopeSpec &SS, 1731 IdentifierInfo *MemberOrBase, 1732 ParsedType TemplateTypeTy, 1733 SourceLocation IdLoc, 1734 SourceLocation LParenLoc, 1735 Expr **Args, unsigned NumArgs, 1736 SourceLocation RParenLoc, 1737 SourceLocation EllipsisLoc) { 1738 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1739 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1740 RParenLoc), 1741 EllipsisLoc); 1742} 1743 1744/// \brief Handle a C++ member initializer. 1745MemInitResult 1746Sema::BuildMemInitializer(Decl *ConstructorD, 1747 Scope *S, 1748 CXXScopeSpec &SS, 1749 IdentifierInfo *MemberOrBase, 1750 ParsedType TemplateTypeTy, 1751 SourceLocation IdLoc, 1752 const MultiInitializer &Args, 1753 SourceLocation EllipsisLoc) { 1754 if (!ConstructorD) 1755 return true; 1756 1757 AdjustDeclIfTemplate(ConstructorD); 1758 1759 CXXConstructorDecl *Constructor 1760 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1761 if (!Constructor) { 1762 // The user wrote a constructor initializer on a function that is 1763 // not a C++ constructor. Ignore the error for now, because we may 1764 // have more member initializers coming; we'll diagnose it just 1765 // once in ActOnMemInitializers. 1766 return true; 1767 } 1768 1769 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1770 1771 // C++ [class.base.init]p2: 1772 // Names in a mem-initializer-id are looked up in the scope of the 1773 // constructor's class and, if not found in that scope, are looked 1774 // up in the scope containing the constructor's definition. 1775 // [Note: if the constructor's class contains a member with the 1776 // same name as a direct or virtual base class of the class, a 1777 // mem-initializer-id naming the member or base class and composed 1778 // of a single identifier refers to the class member. A 1779 // mem-initializer-id for the hidden base class may be specified 1780 // using a qualified name. ] 1781 if (!SS.getScopeRep() && !TemplateTypeTy) { 1782 // Look for a member, first. 1783 FieldDecl *Member = 0; 1784 DeclContext::lookup_result Result 1785 = ClassDecl->lookup(MemberOrBase); 1786 if (Result.first != Result.second) { 1787 Member = dyn_cast<FieldDecl>(*Result.first); 1788 1789 if (Member) { 1790 if (EllipsisLoc.isValid()) 1791 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1792 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1793 1794 return BuildMemberInitializer(Member, Args, IdLoc); 1795 } 1796 1797 // Handle anonymous union case. 1798 if (IndirectFieldDecl* IndirectField 1799 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1800 if (EllipsisLoc.isValid()) 1801 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1802 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1803 1804 return BuildMemberInitializer(IndirectField, Args, IdLoc); 1805 } 1806 } 1807 } 1808 // It didn't name a member, so see if it names a class. 1809 QualType BaseType; 1810 TypeSourceInfo *TInfo = 0; 1811 1812 if (TemplateTypeTy) { 1813 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1814 } else { 1815 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1816 LookupParsedName(R, S, &SS); 1817 1818 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1819 if (!TyD) { 1820 if (R.isAmbiguous()) return true; 1821 1822 // We don't want access-control diagnostics here. 1823 R.suppressDiagnostics(); 1824 1825 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1826 bool NotUnknownSpecialization = false; 1827 DeclContext *DC = computeDeclContext(SS, false); 1828 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1829 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1830 1831 if (!NotUnknownSpecialization) { 1832 // When the scope specifier can refer to a member of an unknown 1833 // specialization, we take it as a type name. 1834 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1835 SS.getWithLocInContext(Context), 1836 *MemberOrBase, IdLoc); 1837 if (BaseType.isNull()) 1838 return true; 1839 1840 R.clear(); 1841 R.setLookupName(MemberOrBase); 1842 } 1843 } 1844 1845 // If no results were found, try to correct typos. 1846 TypoCorrection Corr; 1847 if (R.empty() && BaseType.isNull() && 1848 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1849 ClassDecl, false, CTC_NoKeywords))) { 1850 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1851 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1852 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1853 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1854 // We have found a non-static data member with a similar 1855 // name to what was typed; complain and initialize that 1856 // member. 1857 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1858 << MemberOrBase << true << CorrectedQuotedStr 1859 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1860 Diag(Member->getLocation(), diag::note_previous_decl) 1861 << CorrectedQuotedStr; 1862 1863 return BuildMemberInitializer(Member, Args, IdLoc); 1864 } 1865 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1866 const CXXBaseSpecifier *DirectBaseSpec; 1867 const CXXBaseSpecifier *VirtualBaseSpec; 1868 if (FindBaseInitializer(*this, ClassDecl, 1869 Context.getTypeDeclType(Type), 1870 DirectBaseSpec, VirtualBaseSpec)) { 1871 // We have found a direct or virtual base class with a 1872 // similar name to what was typed; complain and initialize 1873 // that base class. 1874 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1875 << MemberOrBase << false << CorrectedQuotedStr 1876 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1877 1878 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1879 : VirtualBaseSpec; 1880 Diag(BaseSpec->getSourceRange().getBegin(), 1881 diag::note_base_class_specified_here) 1882 << BaseSpec->getType() 1883 << BaseSpec->getSourceRange(); 1884 1885 TyD = Type; 1886 } 1887 } 1888 } 1889 1890 if (!TyD && BaseType.isNull()) { 1891 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1892 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1893 return true; 1894 } 1895 } 1896 1897 if (BaseType.isNull()) { 1898 BaseType = Context.getTypeDeclType(TyD); 1899 if (SS.isSet()) { 1900 NestedNameSpecifier *Qualifier = 1901 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1902 1903 // FIXME: preserve source range information 1904 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1905 } 1906 } 1907 } 1908 1909 if (!TInfo) 1910 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1911 1912 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1913} 1914 1915/// Checks a member initializer expression for cases where reference (or 1916/// pointer) members are bound to by-value parameters (or their addresses). 1917static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1918 Expr *Init, 1919 SourceLocation IdLoc) { 1920 QualType MemberTy = Member->getType(); 1921 1922 // We only handle pointers and references currently. 1923 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1924 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1925 return; 1926 1927 const bool IsPointer = MemberTy->isPointerType(); 1928 if (IsPointer) { 1929 if (const UnaryOperator *Op 1930 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1931 // The only case we're worried about with pointers requires taking the 1932 // address. 1933 if (Op->getOpcode() != UO_AddrOf) 1934 return; 1935 1936 Init = Op->getSubExpr(); 1937 } else { 1938 // We only handle address-of expression initializers for pointers. 1939 return; 1940 } 1941 } 1942 1943 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1944 // Taking the address of a temporary will be diagnosed as a hard error. 1945 if (IsPointer) 1946 return; 1947 1948 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1949 << Member << Init->getSourceRange(); 1950 } else if (const DeclRefExpr *DRE 1951 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1952 // We only warn when referring to a non-reference parameter declaration. 1953 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1954 if (!Parameter || Parameter->getType()->isReferenceType()) 1955 return; 1956 1957 S.Diag(Init->getExprLoc(), 1958 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1959 : diag::warn_bind_ref_member_to_parameter) 1960 << Member << Parameter << Init->getSourceRange(); 1961 } else { 1962 // Other initializers are fine. 1963 return; 1964 } 1965 1966 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1967 << (unsigned)IsPointer; 1968} 1969 1970/// Checks an initializer expression for use of uninitialized fields, such as 1971/// containing the field that is being initialized. Returns true if there is an 1972/// uninitialized field was used an updates the SourceLocation parameter; false 1973/// otherwise. 1974static bool InitExprContainsUninitializedFields(const Stmt *S, 1975 const ValueDecl *LhsField, 1976 SourceLocation *L) { 1977 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1978 1979 if (isa<CallExpr>(S)) { 1980 // Do not descend into function calls or constructors, as the use 1981 // of an uninitialized field may be valid. One would have to inspect 1982 // the contents of the function/ctor to determine if it is safe or not. 1983 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1984 // may be safe, depending on what the function/ctor does. 1985 return false; 1986 } 1987 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1988 const NamedDecl *RhsField = ME->getMemberDecl(); 1989 1990 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1991 // The member expression points to a static data member. 1992 assert(VD->isStaticDataMember() && 1993 "Member points to non-static data member!"); 1994 (void)VD; 1995 return false; 1996 } 1997 1998 if (isa<EnumConstantDecl>(RhsField)) { 1999 // The member expression points to an enum. 2000 return false; 2001 } 2002 2003 if (RhsField == LhsField) { 2004 // Initializing a field with itself. Throw a warning. 2005 // But wait; there are exceptions! 2006 // Exception #1: The field may not belong to this record. 2007 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2008 const Expr *base = ME->getBase(); 2009 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2010 // Even though the field matches, it does not belong to this record. 2011 return false; 2012 } 2013 // None of the exceptions triggered; return true to indicate an 2014 // uninitialized field was used. 2015 *L = ME->getMemberLoc(); 2016 return true; 2017 } 2018 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2019 // sizeof/alignof doesn't reference contents, do not warn. 2020 return false; 2021 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2022 // address-of doesn't reference contents (the pointer may be dereferenced 2023 // in the same expression but it would be rare; and weird). 2024 if (UOE->getOpcode() == UO_AddrOf) 2025 return false; 2026 } 2027 for (Stmt::const_child_range it = S->children(); it; ++it) { 2028 if (!*it) { 2029 // An expression such as 'member(arg ?: "")' may trigger this. 2030 continue; 2031 } 2032 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2033 return true; 2034 } 2035 return false; 2036} 2037 2038MemInitResult 2039Sema::BuildMemberInitializer(ValueDecl *Member, 2040 const MultiInitializer &Args, 2041 SourceLocation IdLoc) { 2042 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2043 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2044 assert((DirectMember || IndirectMember) && 2045 "Member must be a FieldDecl or IndirectFieldDecl"); 2046 2047 if (Member->isInvalidDecl()) 2048 return true; 2049 2050 // Diagnose value-uses of fields to initialize themselves, e.g. 2051 // foo(foo) 2052 // where foo is not also a parameter to the constructor. 2053 // TODO: implement -Wuninitialized and fold this into that framework. 2054 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2055 I != E; ++I) { 2056 SourceLocation L; 2057 Expr *Arg = *I; 2058 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2059 Arg = DIE->getInit(); 2060 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2061 // FIXME: Return true in the case when other fields are used before being 2062 // uninitialized. For example, let this field be the i'th field. When 2063 // initializing the i'th field, throw a warning if any of the >= i'th 2064 // fields are used, as they are not yet initialized. 2065 // Right now we are only handling the case where the i'th field uses 2066 // itself in its initializer. 2067 Diag(L, diag::warn_field_is_uninit); 2068 } 2069 } 2070 2071 bool HasDependentArg = Args.isTypeDependent(); 2072 2073 Expr *Init; 2074 if (Member->getType()->isDependentType() || HasDependentArg) { 2075 // Can't check initialization for a member of dependent type or when 2076 // any of the arguments are type-dependent expressions. 2077 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2078 2079 DiscardCleanupsInEvaluationContext(); 2080 } else { 2081 // Initialize the member. 2082 InitializedEntity MemberEntity = 2083 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2084 : InitializedEntity::InitializeMember(IndirectMember, 0); 2085 InitializationKind Kind = 2086 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2087 Args.getEndLoc()); 2088 2089 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2090 if (MemberInit.isInvalid()) 2091 return true; 2092 2093 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2094 2095 // C++0x [class.base.init]p7: 2096 // The initialization of each base and member constitutes a 2097 // full-expression. 2098 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2099 if (MemberInit.isInvalid()) 2100 return true; 2101 2102 // If we are in a dependent context, template instantiation will 2103 // perform this type-checking again. Just save the arguments that we 2104 // received in a ParenListExpr. 2105 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2106 // of the information that we have about the member 2107 // initializer. However, deconstructing the ASTs is a dicey process, 2108 // and this approach is far more likely to get the corner cases right. 2109 if (CurContext->isDependentContext()) { 2110 Init = Args.CreateInitExpr(Context, 2111 Member->getType().getNonReferenceType()); 2112 } else { 2113 Init = MemberInit.get(); 2114 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2115 } 2116 } 2117 2118 if (DirectMember) { 2119 return new (Context) CXXCtorInitializer(Context, DirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } else { 2123 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2124 IdLoc, Args.getStartLoc(), 2125 Init, Args.getEndLoc()); 2126 } 2127} 2128 2129MemInitResult 2130Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2131 const MultiInitializer &Args, 2132 SourceLocation NameLoc, 2133 CXXRecordDecl *ClassDecl) { 2134 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2135 if (!LangOpts.CPlusPlus0x) 2136 return Diag(Loc, diag::err_delegation_0x_only) 2137 << TInfo->getTypeLoc().getLocalSourceRange(); 2138 2139 // Initialize the object. 2140 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2141 QualType(ClassDecl->getTypeForDecl(), 0)); 2142 InitializationKind Kind = 2143 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2144 Args.getEndLoc()); 2145 2146 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2147 if (DelegationInit.isInvalid()) 2148 return true; 2149 2150 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2151 CXXConstructorDecl *Constructor 2152 = ConExpr->getConstructor(); 2153 assert(Constructor && "Delegating constructor with no target?"); 2154 2155 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2156 2157 // C++0x [class.base.init]p7: 2158 // The initialization of each base and member constitutes a 2159 // full-expression. 2160 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2161 if (DelegationInit.isInvalid()) 2162 return true; 2163 2164 assert(!CurContext->isDependentContext()); 2165 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2166 Constructor, 2167 DelegationInit.takeAs<Expr>(), 2168 Args.getEndLoc()); 2169} 2170 2171MemInitResult 2172Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2173 const MultiInitializer &Args, 2174 CXXRecordDecl *ClassDecl, 2175 SourceLocation EllipsisLoc) { 2176 bool HasDependentArg = Args.isTypeDependent(); 2177 2178 SourceLocation BaseLoc 2179 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2180 2181 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2182 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2183 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2184 2185 // C++ [class.base.init]p2: 2186 // [...] Unless the mem-initializer-id names a nonstatic data 2187 // member of the constructor's class or a direct or virtual base 2188 // of that class, the mem-initializer is ill-formed. A 2189 // mem-initializer-list can initialize a base class using any 2190 // name that denotes that base class type. 2191 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2192 2193 if (EllipsisLoc.isValid()) { 2194 // This is a pack expansion. 2195 if (!BaseType->containsUnexpandedParameterPack()) { 2196 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2197 << SourceRange(BaseLoc, Args.getEndLoc()); 2198 2199 EllipsisLoc = SourceLocation(); 2200 } 2201 } else { 2202 // Check for any unexpanded parameter packs. 2203 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2204 return true; 2205 2206 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2207 return true; 2208 } 2209 2210 // Check for direct and virtual base classes. 2211 const CXXBaseSpecifier *DirectBaseSpec = 0; 2212 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2213 if (!Dependent) { 2214 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2215 BaseType)) 2216 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2217 2218 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2219 VirtualBaseSpec); 2220 2221 // C++ [base.class.init]p2: 2222 // Unless the mem-initializer-id names a nonstatic data member of the 2223 // constructor's class or a direct or virtual base of that class, the 2224 // mem-initializer is ill-formed. 2225 if (!DirectBaseSpec && !VirtualBaseSpec) { 2226 // If the class has any dependent bases, then it's possible that 2227 // one of those types will resolve to the same type as 2228 // BaseType. Therefore, just treat this as a dependent base 2229 // class initialization. FIXME: Should we try to check the 2230 // initialization anyway? It seems odd. 2231 if (ClassDecl->hasAnyDependentBases()) 2232 Dependent = true; 2233 else 2234 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2235 << BaseType << Context.getTypeDeclType(ClassDecl) 2236 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2237 } 2238 } 2239 2240 if (Dependent) { 2241 // Can't check initialization for a base of dependent type or when 2242 // any of the arguments are type-dependent expressions. 2243 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2244 2245 DiscardCleanupsInEvaluationContext(); 2246 2247 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2248 /*IsVirtual=*/false, 2249 Args.getStartLoc(), BaseInit, 2250 Args.getEndLoc(), EllipsisLoc); 2251 } 2252 2253 // C++ [base.class.init]p2: 2254 // If a mem-initializer-id is ambiguous because it designates both 2255 // a direct non-virtual base class and an inherited virtual base 2256 // class, the mem-initializer is ill-formed. 2257 if (DirectBaseSpec && VirtualBaseSpec) 2258 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2259 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2260 2261 CXXBaseSpecifier *BaseSpec 2262 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2263 if (!BaseSpec) 2264 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2265 2266 // Initialize the base. 2267 InitializedEntity BaseEntity = 2268 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2269 InitializationKind Kind = 2270 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2271 Args.getEndLoc()); 2272 2273 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2274 if (BaseInit.isInvalid()) 2275 return true; 2276 2277 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2278 2279 // C++0x [class.base.init]p7: 2280 // The initialization of each base and member constitutes a 2281 // full-expression. 2282 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2283 if (BaseInit.isInvalid()) 2284 return true; 2285 2286 // If we are in a dependent context, template instantiation will 2287 // perform this type-checking again. Just save the arguments that we 2288 // received in a ParenListExpr. 2289 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2290 // of the information that we have about the base 2291 // initializer. However, deconstructing the ASTs is a dicey process, 2292 // and this approach is far more likely to get the corner cases right. 2293 if (CurContext->isDependentContext()) 2294 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2295 2296 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2297 BaseSpec->isVirtual(), 2298 Args.getStartLoc(), 2299 BaseInit.takeAs<Expr>(), 2300 Args.getEndLoc(), EllipsisLoc); 2301} 2302 2303// Create a static_cast\<T&&>(expr). 2304static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2305 QualType ExprType = E->getType(); 2306 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2307 SourceLocation ExprLoc = E->getLocStart(); 2308 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2309 TargetType, ExprLoc); 2310 2311 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2312 SourceRange(ExprLoc, ExprLoc), 2313 E->getSourceRange()).take(); 2314} 2315 2316/// ImplicitInitializerKind - How an implicit base or member initializer should 2317/// initialize its base or member. 2318enum ImplicitInitializerKind { 2319 IIK_Default, 2320 IIK_Copy, 2321 IIK_Move 2322}; 2323 2324static bool 2325BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2326 ImplicitInitializerKind ImplicitInitKind, 2327 CXXBaseSpecifier *BaseSpec, 2328 bool IsInheritedVirtualBase, 2329 CXXCtorInitializer *&CXXBaseInit) { 2330 InitializedEntity InitEntity 2331 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2332 IsInheritedVirtualBase); 2333 2334 ExprResult BaseInit; 2335 2336 switch (ImplicitInitKind) { 2337 case IIK_Default: { 2338 InitializationKind InitKind 2339 = InitializationKind::CreateDefault(Constructor->getLocation()); 2340 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2341 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2342 MultiExprArg(SemaRef, 0, 0)); 2343 break; 2344 } 2345 2346 case IIK_Move: 2347 case IIK_Copy: { 2348 bool Moving = ImplicitInitKind == IIK_Move; 2349 ParmVarDecl *Param = Constructor->getParamDecl(0); 2350 QualType ParamType = Param->getType().getNonReferenceType(); 2351 2352 Expr *CopyCtorArg = 2353 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2354 Constructor->getLocation(), ParamType, 2355 VK_LValue, 0); 2356 2357 // Cast to the base class to avoid ambiguities. 2358 QualType ArgTy = 2359 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2360 ParamType.getQualifiers()); 2361 2362 if (Moving) { 2363 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2364 } 2365 2366 CXXCastPath BasePath; 2367 BasePath.push_back(BaseSpec); 2368 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2369 CK_UncheckedDerivedToBase, 2370 Moving ? VK_XValue : VK_LValue, 2371 &BasePath).take(); 2372 2373 InitializationKind InitKind 2374 = InitializationKind::CreateDirect(Constructor->getLocation(), 2375 SourceLocation(), SourceLocation()); 2376 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2377 &CopyCtorArg, 1); 2378 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2379 MultiExprArg(&CopyCtorArg, 1)); 2380 break; 2381 } 2382 } 2383 2384 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2385 if (BaseInit.isInvalid()) 2386 return true; 2387 2388 CXXBaseInit = 2389 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2390 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2391 SourceLocation()), 2392 BaseSpec->isVirtual(), 2393 SourceLocation(), 2394 BaseInit.takeAs<Expr>(), 2395 SourceLocation(), 2396 SourceLocation()); 2397 2398 return false; 2399} 2400 2401static bool RefersToRValueRef(Expr *MemRef) { 2402 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2403 return Referenced->getType()->isRValueReferenceType(); 2404} 2405 2406static bool 2407BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2408 ImplicitInitializerKind ImplicitInitKind, 2409 FieldDecl *Field, IndirectFieldDecl *Indirect, 2410 CXXCtorInitializer *&CXXMemberInit) { 2411 if (Field->isInvalidDecl()) 2412 return true; 2413 2414 SourceLocation Loc = Constructor->getLocation(); 2415 2416 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2417 bool Moving = ImplicitInitKind == IIK_Move; 2418 ParmVarDecl *Param = Constructor->getParamDecl(0); 2419 QualType ParamType = Param->getType().getNonReferenceType(); 2420 2421 // Suppress copying zero-width bitfields. 2422 if (const Expr *Width = Field->getBitWidth()) 2423 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 2424 return false; 2425 2426 Expr *MemberExprBase = 2427 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2428 Loc, ParamType, VK_LValue, 0); 2429 2430 if (Moving) { 2431 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2432 } 2433 2434 // Build a reference to this field within the parameter. 2435 CXXScopeSpec SS; 2436 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2437 Sema::LookupMemberName); 2438 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2439 : cast<ValueDecl>(Field), AS_public); 2440 MemberLookup.resolveKind(); 2441 ExprResult CtorArg 2442 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2443 ParamType, Loc, 2444 /*IsArrow=*/false, 2445 SS, 2446 /*FirstQualifierInScope=*/0, 2447 MemberLookup, 2448 /*TemplateArgs=*/0); 2449 if (CtorArg.isInvalid()) 2450 return true; 2451 2452 // C++11 [class.copy]p15: 2453 // - if a member m has rvalue reference type T&&, it is direct-initialized 2454 // with static_cast<T&&>(x.m); 2455 if (RefersToRValueRef(CtorArg.get())) { 2456 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2457 } 2458 2459 // When the field we are copying is an array, create index variables for 2460 // each dimension of the array. We use these index variables to subscript 2461 // the source array, and other clients (e.g., CodeGen) will perform the 2462 // necessary iteration with these index variables. 2463 SmallVector<VarDecl *, 4> IndexVariables; 2464 QualType BaseType = Field->getType(); 2465 QualType SizeType = SemaRef.Context.getSizeType(); 2466 bool InitializingArray = false; 2467 while (const ConstantArrayType *Array 2468 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2469 InitializingArray = true; 2470 // Create the iteration variable for this array index. 2471 IdentifierInfo *IterationVarName = 0; 2472 { 2473 llvm::SmallString<8> Str; 2474 llvm::raw_svector_ostream OS(Str); 2475 OS << "__i" << IndexVariables.size(); 2476 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2477 } 2478 VarDecl *IterationVar 2479 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2480 IterationVarName, SizeType, 2481 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2482 SC_None, SC_None); 2483 IndexVariables.push_back(IterationVar); 2484 2485 // Create a reference to the iteration variable. 2486 ExprResult IterationVarRef 2487 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2488 assert(!IterationVarRef.isInvalid() && 2489 "Reference to invented variable cannot fail!"); 2490 2491 // Subscript the array with this iteration variable. 2492 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2493 IterationVarRef.take(), 2494 Loc); 2495 if (CtorArg.isInvalid()) 2496 return true; 2497 2498 BaseType = Array->getElementType(); 2499 } 2500 2501 // The array subscript expression is an lvalue, which is wrong for moving. 2502 if (Moving && InitializingArray) 2503 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2504 2505 // Construct the entity that we will be initializing. For an array, this 2506 // will be first element in the array, which may require several levels 2507 // of array-subscript entities. 2508 SmallVector<InitializedEntity, 4> Entities; 2509 Entities.reserve(1 + IndexVariables.size()); 2510 if (Indirect) 2511 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2512 else 2513 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2514 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2515 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2516 0, 2517 Entities.back())); 2518 2519 // Direct-initialize to use the copy constructor. 2520 InitializationKind InitKind = 2521 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2522 2523 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2524 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2525 &CtorArgE, 1); 2526 2527 ExprResult MemberInit 2528 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2529 MultiExprArg(&CtorArgE, 1)); 2530 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2531 if (MemberInit.isInvalid()) 2532 return true; 2533 2534 if (Indirect) { 2535 assert(IndexVariables.size() == 0 && 2536 "Indirect field improperly initialized"); 2537 CXXMemberInit 2538 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2539 Loc, Loc, 2540 MemberInit.takeAs<Expr>(), 2541 Loc); 2542 } else 2543 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2544 Loc, MemberInit.takeAs<Expr>(), 2545 Loc, 2546 IndexVariables.data(), 2547 IndexVariables.size()); 2548 return false; 2549 } 2550 2551 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2552 2553 QualType FieldBaseElementType = 2554 SemaRef.Context.getBaseElementType(Field->getType()); 2555 2556 if (FieldBaseElementType->isRecordType()) { 2557 InitializedEntity InitEntity 2558 = Indirect? InitializedEntity::InitializeMember(Indirect) 2559 : InitializedEntity::InitializeMember(Field); 2560 InitializationKind InitKind = 2561 InitializationKind::CreateDefault(Loc); 2562 2563 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2564 ExprResult MemberInit = 2565 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2566 2567 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2568 if (MemberInit.isInvalid()) 2569 return true; 2570 2571 if (Indirect) 2572 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2573 Indirect, Loc, 2574 Loc, 2575 MemberInit.get(), 2576 Loc); 2577 else 2578 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2579 Field, Loc, Loc, 2580 MemberInit.get(), 2581 Loc); 2582 return false; 2583 } 2584 2585 if (!Field->getParent()->isUnion()) { 2586 if (FieldBaseElementType->isReferenceType()) { 2587 SemaRef.Diag(Constructor->getLocation(), 2588 diag::err_uninitialized_member_in_ctor) 2589 << (int)Constructor->isImplicit() 2590 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2591 << 0 << Field->getDeclName(); 2592 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2593 return true; 2594 } 2595 2596 if (FieldBaseElementType.isConstQualified()) { 2597 SemaRef.Diag(Constructor->getLocation(), 2598 diag::err_uninitialized_member_in_ctor) 2599 << (int)Constructor->isImplicit() 2600 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2601 << 1 << Field->getDeclName(); 2602 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2603 return true; 2604 } 2605 } 2606 2607 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2608 FieldBaseElementType->isObjCRetainableType() && 2609 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2610 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2611 // Instant objects: 2612 // Default-initialize Objective-C pointers to NULL. 2613 CXXMemberInit 2614 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2615 Loc, Loc, 2616 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2617 Loc); 2618 return false; 2619 } 2620 2621 // Nothing to initialize. 2622 CXXMemberInit = 0; 2623 return false; 2624} 2625 2626namespace { 2627struct BaseAndFieldInfo { 2628 Sema &S; 2629 CXXConstructorDecl *Ctor; 2630 bool AnyErrorsInInits; 2631 ImplicitInitializerKind IIK; 2632 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2633 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2634 2635 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2636 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2637 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2638 if (Generated && Ctor->isCopyConstructor()) 2639 IIK = IIK_Copy; 2640 else if (Generated && Ctor->isMoveConstructor()) 2641 IIK = IIK_Move; 2642 else 2643 IIK = IIK_Default; 2644 } 2645}; 2646} 2647 2648/// \brief Determine whether the given indirect field declaration is somewhere 2649/// within an anonymous union. 2650static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2651 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2652 CEnd = F->chain_end(); 2653 C != CEnd; ++C) 2654 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2655 if (Record->isUnion()) 2656 return true; 2657 2658 return false; 2659} 2660 2661static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2662 FieldDecl *Field, 2663 IndirectFieldDecl *Indirect = 0) { 2664 2665 // Overwhelmingly common case: we have a direct initializer for this field. 2666 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2667 Info.AllToInit.push_back(Init); 2668 return false; 2669 } 2670 2671 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2672 // has a brace-or-equal-initializer, the entity is initialized as specified 2673 // in [dcl.init]. 2674 if (Field->hasInClassInitializer()) { 2675 CXXCtorInitializer *Init; 2676 if (Indirect) 2677 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2678 SourceLocation(), 2679 SourceLocation(), 0, 2680 SourceLocation()); 2681 else 2682 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2683 SourceLocation(), 2684 SourceLocation(), 0, 2685 SourceLocation()); 2686 Info.AllToInit.push_back(Init); 2687 return false; 2688 } 2689 2690 // Don't build an implicit initializer for union members if none was 2691 // explicitly specified. 2692 if (Field->getParent()->isUnion() || 2693 (Indirect && isWithinAnonymousUnion(Indirect))) 2694 return false; 2695 2696 // Don't try to build an implicit initializer if there were semantic 2697 // errors in any of the initializers (and therefore we might be 2698 // missing some that the user actually wrote). 2699 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2700 return false; 2701 2702 CXXCtorInitializer *Init = 0; 2703 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2704 Indirect, Init)) 2705 return true; 2706 2707 if (Init) 2708 Info.AllToInit.push_back(Init); 2709 2710 return false; 2711} 2712 2713bool 2714Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2715 CXXCtorInitializer *Initializer) { 2716 assert(Initializer->isDelegatingInitializer()); 2717 Constructor->setNumCtorInitializers(1); 2718 CXXCtorInitializer **initializer = 2719 new (Context) CXXCtorInitializer*[1]; 2720 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2721 Constructor->setCtorInitializers(initializer); 2722 2723 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2724 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2725 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2726 } 2727 2728 DelegatingCtorDecls.push_back(Constructor); 2729 2730 return false; 2731} 2732 2733bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2734 CXXCtorInitializer **Initializers, 2735 unsigned NumInitializers, 2736 bool AnyErrors) { 2737 if (Constructor->isDependentContext()) { 2738 // Just store the initializers as written, they will be checked during 2739 // instantiation. 2740 if (NumInitializers > 0) { 2741 Constructor->setNumCtorInitializers(NumInitializers); 2742 CXXCtorInitializer **baseOrMemberInitializers = 2743 new (Context) CXXCtorInitializer*[NumInitializers]; 2744 memcpy(baseOrMemberInitializers, Initializers, 2745 NumInitializers * sizeof(CXXCtorInitializer*)); 2746 Constructor->setCtorInitializers(baseOrMemberInitializers); 2747 } 2748 2749 return false; 2750 } 2751 2752 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2753 2754 // We need to build the initializer AST according to order of construction 2755 // and not what user specified in the Initializers list. 2756 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2757 if (!ClassDecl) 2758 return true; 2759 2760 bool HadError = false; 2761 2762 for (unsigned i = 0; i < NumInitializers; i++) { 2763 CXXCtorInitializer *Member = Initializers[i]; 2764 2765 if (Member->isBaseInitializer()) 2766 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2767 else 2768 Info.AllBaseFields[Member->getAnyMember()] = Member; 2769 } 2770 2771 // Keep track of the direct virtual bases. 2772 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2773 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2774 E = ClassDecl->bases_end(); I != E; ++I) { 2775 if (I->isVirtual()) 2776 DirectVBases.insert(I); 2777 } 2778 2779 // Push virtual bases before others. 2780 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2781 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2782 2783 if (CXXCtorInitializer *Value 2784 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2785 Info.AllToInit.push_back(Value); 2786 } else if (!AnyErrors) { 2787 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2788 CXXCtorInitializer *CXXBaseInit; 2789 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2790 VBase, IsInheritedVirtualBase, 2791 CXXBaseInit)) { 2792 HadError = true; 2793 continue; 2794 } 2795 2796 Info.AllToInit.push_back(CXXBaseInit); 2797 } 2798 } 2799 2800 // Non-virtual bases. 2801 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2802 E = ClassDecl->bases_end(); Base != E; ++Base) { 2803 // Virtuals are in the virtual base list and already constructed. 2804 if (Base->isVirtual()) 2805 continue; 2806 2807 if (CXXCtorInitializer *Value 2808 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2809 Info.AllToInit.push_back(Value); 2810 } else if (!AnyErrors) { 2811 CXXCtorInitializer *CXXBaseInit; 2812 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2813 Base, /*IsInheritedVirtualBase=*/false, 2814 CXXBaseInit)) { 2815 HadError = true; 2816 continue; 2817 } 2818 2819 Info.AllToInit.push_back(CXXBaseInit); 2820 } 2821 } 2822 2823 // Fields. 2824 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2825 MemEnd = ClassDecl->decls_end(); 2826 Mem != MemEnd; ++Mem) { 2827 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2828 if (F->getType()->isIncompleteArrayType()) { 2829 assert(ClassDecl->hasFlexibleArrayMember() && 2830 "Incomplete array type is not valid"); 2831 continue; 2832 } 2833 2834 // If we're not generating the implicit copy/move constructor, then we'll 2835 // handle anonymous struct/union fields based on their individual 2836 // indirect fields. 2837 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2838 continue; 2839 2840 if (CollectFieldInitializer(*this, Info, F)) 2841 HadError = true; 2842 continue; 2843 } 2844 2845 // Beyond this point, we only consider default initialization. 2846 if (Info.IIK != IIK_Default) 2847 continue; 2848 2849 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2850 if (F->getType()->isIncompleteArrayType()) { 2851 assert(ClassDecl->hasFlexibleArrayMember() && 2852 "Incomplete array type is not valid"); 2853 continue; 2854 } 2855 2856 // Initialize each field of an anonymous struct individually. 2857 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2858 HadError = true; 2859 2860 continue; 2861 } 2862 } 2863 2864 NumInitializers = Info.AllToInit.size(); 2865 if (NumInitializers > 0) { 2866 Constructor->setNumCtorInitializers(NumInitializers); 2867 CXXCtorInitializer **baseOrMemberInitializers = 2868 new (Context) CXXCtorInitializer*[NumInitializers]; 2869 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2870 NumInitializers * sizeof(CXXCtorInitializer*)); 2871 Constructor->setCtorInitializers(baseOrMemberInitializers); 2872 2873 // Constructors implicitly reference the base and member 2874 // destructors. 2875 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2876 Constructor->getParent()); 2877 } 2878 2879 return HadError; 2880} 2881 2882static void *GetKeyForTopLevelField(FieldDecl *Field) { 2883 // For anonymous unions, use the class declaration as the key. 2884 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2885 if (RT->getDecl()->isAnonymousStructOrUnion()) 2886 return static_cast<void *>(RT->getDecl()); 2887 } 2888 return static_cast<void *>(Field); 2889} 2890 2891static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2892 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2893} 2894 2895static void *GetKeyForMember(ASTContext &Context, 2896 CXXCtorInitializer *Member) { 2897 if (!Member->isAnyMemberInitializer()) 2898 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2899 2900 // For fields injected into the class via declaration of an anonymous union, 2901 // use its anonymous union class declaration as the unique key. 2902 FieldDecl *Field = Member->getAnyMember(); 2903 2904 // If the field is a member of an anonymous struct or union, our key 2905 // is the anonymous record decl that's a direct child of the class. 2906 RecordDecl *RD = Field->getParent(); 2907 if (RD->isAnonymousStructOrUnion()) { 2908 while (true) { 2909 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2910 if (Parent->isAnonymousStructOrUnion()) 2911 RD = Parent; 2912 else 2913 break; 2914 } 2915 2916 return static_cast<void *>(RD); 2917 } 2918 2919 return static_cast<void *>(Field); 2920} 2921 2922static void 2923DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2924 const CXXConstructorDecl *Constructor, 2925 CXXCtorInitializer **Inits, 2926 unsigned NumInits) { 2927 if (Constructor->getDeclContext()->isDependentContext()) 2928 return; 2929 2930 // Don't check initializers order unless the warning is enabled at the 2931 // location of at least one initializer. 2932 bool ShouldCheckOrder = false; 2933 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2934 CXXCtorInitializer *Init = Inits[InitIndex]; 2935 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2936 Init->getSourceLocation()) 2937 != DiagnosticsEngine::Ignored) { 2938 ShouldCheckOrder = true; 2939 break; 2940 } 2941 } 2942 if (!ShouldCheckOrder) 2943 return; 2944 2945 // Build the list of bases and members in the order that they'll 2946 // actually be initialized. The explicit initializers should be in 2947 // this same order but may be missing things. 2948 SmallVector<const void*, 32> IdealInitKeys; 2949 2950 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2951 2952 // 1. Virtual bases. 2953 for (CXXRecordDecl::base_class_const_iterator VBase = 2954 ClassDecl->vbases_begin(), 2955 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2956 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2957 2958 // 2. Non-virtual bases. 2959 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2960 E = ClassDecl->bases_end(); Base != E; ++Base) { 2961 if (Base->isVirtual()) 2962 continue; 2963 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2964 } 2965 2966 // 3. Direct fields. 2967 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2968 E = ClassDecl->field_end(); Field != E; ++Field) 2969 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2970 2971 unsigned NumIdealInits = IdealInitKeys.size(); 2972 unsigned IdealIndex = 0; 2973 2974 CXXCtorInitializer *PrevInit = 0; 2975 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2976 CXXCtorInitializer *Init = Inits[InitIndex]; 2977 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2978 2979 // Scan forward to try to find this initializer in the idealized 2980 // initializers list. 2981 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2982 if (InitKey == IdealInitKeys[IdealIndex]) 2983 break; 2984 2985 // If we didn't find this initializer, it must be because we 2986 // scanned past it on a previous iteration. That can only 2987 // happen if we're out of order; emit a warning. 2988 if (IdealIndex == NumIdealInits && PrevInit) { 2989 Sema::SemaDiagnosticBuilder D = 2990 SemaRef.Diag(PrevInit->getSourceLocation(), 2991 diag::warn_initializer_out_of_order); 2992 2993 if (PrevInit->isAnyMemberInitializer()) 2994 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2995 else 2996 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2997 2998 if (Init->isAnyMemberInitializer()) 2999 D << 0 << Init->getAnyMember()->getDeclName(); 3000 else 3001 D << 1 << Init->getBaseClassInfo()->getType(); 3002 3003 // Move back to the initializer's location in the ideal list. 3004 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3005 if (InitKey == IdealInitKeys[IdealIndex]) 3006 break; 3007 3008 assert(IdealIndex != NumIdealInits && 3009 "initializer not found in initializer list"); 3010 } 3011 3012 PrevInit = Init; 3013 } 3014} 3015 3016namespace { 3017bool CheckRedundantInit(Sema &S, 3018 CXXCtorInitializer *Init, 3019 CXXCtorInitializer *&PrevInit) { 3020 if (!PrevInit) { 3021 PrevInit = Init; 3022 return false; 3023 } 3024 3025 if (FieldDecl *Field = Init->getMember()) 3026 S.Diag(Init->getSourceLocation(), 3027 diag::err_multiple_mem_initialization) 3028 << Field->getDeclName() 3029 << Init->getSourceRange(); 3030 else { 3031 const Type *BaseClass = Init->getBaseClass(); 3032 assert(BaseClass && "neither field nor base"); 3033 S.Diag(Init->getSourceLocation(), 3034 diag::err_multiple_base_initialization) 3035 << QualType(BaseClass, 0) 3036 << Init->getSourceRange(); 3037 } 3038 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3039 << 0 << PrevInit->getSourceRange(); 3040 3041 return true; 3042} 3043 3044typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3045typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3046 3047bool CheckRedundantUnionInit(Sema &S, 3048 CXXCtorInitializer *Init, 3049 RedundantUnionMap &Unions) { 3050 FieldDecl *Field = Init->getAnyMember(); 3051 RecordDecl *Parent = Field->getParent(); 3052 if (!Parent->isAnonymousStructOrUnion()) 3053 return false; 3054 3055 NamedDecl *Child = Field; 3056 do { 3057 if (Parent->isUnion()) { 3058 UnionEntry &En = Unions[Parent]; 3059 if (En.first && En.first != Child) { 3060 S.Diag(Init->getSourceLocation(), 3061 diag::err_multiple_mem_union_initialization) 3062 << Field->getDeclName() 3063 << Init->getSourceRange(); 3064 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3065 << 0 << En.second->getSourceRange(); 3066 return true; 3067 } else if (!En.first) { 3068 En.first = Child; 3069 En.second = Init; 3070 } 3071 } 3072 3073 Child = Parent; 3074 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3075 } while (Parent->isAnonymousStructOrUnion()); 3076 3077 return false; 3078} 3079} 3080 3081/// ActOnMemInitializers - Handle the member initializers for a constructor. 3082void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3083 SourceLocation ColonLoc, 3084 CXXCtorInitializer **meminits, 3085 unsigned NumMemInits, 3086 bool AnyErrors) { 3087 if (!ConstructorDecl) 3088 return; 3089 3090 AdjustDeclIfTemplate(ConstructorDecl); 3091 3092 CXXConstructorDecl *Constructor 3093 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3094 3095 if (!Constructor) { 3096 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3097 return; 3098 } 3099 3100 CXXCtorInitializer **MemInits = 3101 reinterpret_cast<CXXCtorInitializer **>(meminits); 3102 3103 // Mapping for the duplicate initializers check. 3104 // For member initializers, this is keyed with a FieldDecl*. 3105 // For base initializers, this is keyed with a Type*. 3106 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3107 3108 // Mapping for the inconsistent anonymous-union initializers check. 3109 RedundantUnionMap MemberUnions; 3110 3111 bool HadError = false; 3112 for (unsigned i = 0; i < NumMemInits; i++) { 3113 CXXCtorInitializer *Init = MemInits[i]; 3114 3115 // Set the source order index. 3116 Init->setSourceOrder(i); 3117 3118 if (Init->isAnyMemberInitializer()) { 3119 FieldDecl *Field = Init->getAnyMember(); 3120 if (CheckRedundantInit(*this, Init, Members[Field]) || 3121 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3122 HadError = true; 3123 } else if (Init->isBaseInitializer()) { 3124 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3125 if (CheckRedundantInit(*this, Init, Members[Key])) 3126 HadError = true; 3127 } else { 3128 assert(Init->isDelegatingInitializer()); 3129 // This must be the only initializer 3130 if (i != 0 || NumMemInits > 1) { 3131 Diag(MemInits[0]->getSourceLocation(), 3132 diag::err_delegating_initializer_alone) 3133 << MemInits[0]->getSourceRange(); 3134 HadError = true; 3135 // We will treat this as being the only initializer. 3136 } 3137 SetDelegatingInitializer(Constructor, MemInits[i]); 3138 // Return immediately as the initializer is set. 3139 return; 3140 } 3141 } 3142 3143 if (HadError) 3144 return; 3145 3146 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3147 3148 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3149} 3150 3151void 3152Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3153 CXXRecordDecl *ClassDecl) { 3154 // Ignore dependent contexts. Also ignore unions, since their members never 3155 // have destructors implicitly called. 3156 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3157 return; 3158 3159 // FIXME: all the access-control diagnostics are positioned on the 3160 // field/base declaration. That's probably good; that said, the 3161 // user might reasonably want to know why the destructor is being 3162 // emitted, and we currently don't say. 3163 3164 // Non-static data members. 3165 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3166 E = ClassDecl->field_end(); I != E; ++I) { 3167 FieldDecl *Field = *I; 3168 if (Field->isInvalidDecl()) 3169 continue; 3170 QualType FieldType = Context.getBaseElementType(Field->getType()); 3171 3172 const RecordType* RT = FieldType->getAs<RecordType>(); 3173 if (!RT) 3174 continue; 3175 3176 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3177 if (FieldClassDecl->isInvalidDecl()) 3178 continue; 3179 if (FieldClassDecl->hasTrivialDestructor()) 3180 continue; 3181 3182 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3183 assert(Dtor && "No dtor found for FieldClassDecl!"); 3184 CheckDestructorAccess(Field->getLocation(), Dtor, 3185 PDiag(diag::err_access_dtor_field) 3186 << Field->getDeclName() 3187 << FieldType); 3188 3189 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3190 } 3191 3192 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3193 3194 // Bases. 3195 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3196 E = ClassDecl->bases_end(); Base != E; ++Base) { 3197 // Bases are always records in a well-formed non-dependent class. 3198 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3199 3200 // Remember direct virtual bases. 3201 if (Base->isVirtual()) 3202 DirectVirtualBases.insert(RT); 3203 3204 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3205 // If our base class is invalid, we probably can't get its dtor anyway. 3206 if (BaseClassDecl->isInvalidDecl()) 3207 continue; 3208 // Ignore trivial destructors. 3209 if (BaseClassDecl->hasTrivialDestructor()) 3210 continue; 3211 3212 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3213 assert(Dtor && "No dtor found for BaseClassDecl!"); 3214 3215 // FIXME: caret should be on the start of the class name 3216 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3217 PDiag(diag::err_access_dtor_base) 3218 << Base->getType() 3219 << Base->getSourceRange()); 3220 3221 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3222 } 3223 3224 // Virtual bases. 3225 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3226 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3227 3228 // Bases are always records in a well-formed non-dependent class. 3229 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3230 3231 // Ignore direct virtual bases. 3232 if (DirectVirtualBases.count(RT)) 3233 continue; 3234 3235 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3236 // If our base class is invalid, we probably can't get its dtor anyway. 3237 if (BaseClassDecl->isInvalidDecl()) 3238 continue; 3239 // Ignore trivial destructors. 3240 if (BaseClassDecl->hasTrivialDestructor()) 3241 continue; 3242 3243 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3244 assert(Dtor && "No dtor found for BaseClassDecl!"); 3245 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3246 PDiag(diag::err_access_dtor_vbase) 3247 << VBase->getType()); 3248 3249 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3250 } 3251} 3252 3253void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3254 if (!CDtorDecl) 3255 return; 3256 3257 if (CXXConstructorDecl *Constructor 3258 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3259 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3260} 3261 3262bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3263 unsigned DiagID, AbstractDiagSelID SelID) { 3264 if (SelID == -1) 3265 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3266 else 3267 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3268} 3269 3270bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3271 const PartialDiagnostic &PD) { 3272 if (!getLangOptions().CPlusPlus) 3273 return false; 3274 3275 if (const ArrayType *AT = Context.getAsArrayType(T)) 3276 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3277 3278 if (const PointerType *PT = T->getAs<PointerType>()) { 3279 // Find the innermost pointer type. 3280 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3281 PT = T; 3282 3283 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3284 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3285 } 3286 3287 const RecordType *RT = T->getAs<RecordType>(); 3288 if (!RT) 3289 return false; 3290 3291 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3292 3293 // We can't answer whether something is abstract until it has a 3294 // definition. If it's currently being defined, we'll walk back 3295 // over all the declarations when we have a full definition. 3296 const CXXRecordDecl *Def = RD->getDefinition(); 3297 if (!Def || Def->isBeingDefined()) 3298 return false; 3299 3300 if (!RD->isAbstract()) 3301 return false; 3302 3303 Diag(Loc, PD) << RD->getDeclName(); 3304 DiagnoseAbstractType(RD); 3305 3306 return true; 3307} 3308 3309void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3310 // Check if we've already emitted the list of pure virtual functions 3311 // for this class. 3312 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3313 return; 3314 3315 CXXFinalOverriderMap FinalOverriders; 3316 RD->getFinalOverriders(FinalOverriders); 3317 3318 // Keep a set of seen pure methods so we won't diagnose the same method 3319 // more than once. 3320 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3321 3322 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3323 MEnd = FinalOverriders.end(); 3324 M != MEnd; 3325 ++M) { 3326 for (OverridingMethods::iterator SO = M->second.begin(), 3327 SOEnd = M->second.end(); 3328 SO != SOEnd; ++SO) { 3329 // C++ [class.abstract]p4: 3330 // A class is abstract if it contains or inherits at least one 3331 // pure virtual function for which the final overrider is pure 3332 // virtual. 3333 3334 // 3335 if (SO->second.size() != 1) 3336 continue; 3337 3338 if (!SO->second.front().Method->isPure()) 3339 continue; 3340 3341 if (!SeenPureMethods.insert(SO->second.front().Method)) 3342 continue; 3343 3344 Diag(SO->second.front().Method->getLocation(), 3345 diag::note_pure_virtual_function) 3346 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3347 } 3348 } 3349 3350 if (!PureVirtualClassDiagSet) 3351 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3352 PureVirtualClassDiagSet->insert(RD); 3353} 3354 3355namespace { 3356struct AbstractUsageInfo { 3357 Sema &S; 3358 CXXRecordDecl *Record; 3359 CanQualType AbstractType; 3360 bool Invalid; 3361 3362 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3363 : S(S), Record(Record), 3364 AbstractType(S.Context.getCanonicalType( 3365 S.Context.getTypeDeclType(Record))), 3366 Invalid(false) {} 3367 3368 void DiagnoseAbstractType() { 3369 if (Invalid) return; 3370 S.DiagnoseAbstractType(Record); 3371 Invalid = true; 3372 } 3373 3374 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3375}; 3376 3377struct CheckAbstractUsage { 3378 AbstractUsageInfo &Info; 3379 const NamedDecl *Ctx; 3380 3381 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3382 : Info(Info), Ctx(Ctx) {} 3383 3384 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3385 switch (TL.getTypeLocClass()) { 3386#define ABSTRACT_TYPELOC(CLASS, PARENT) 3387#define TYPELOC(CLASS, PARENT) \ 3388 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3389#include "clang/AST/TypeLocNodes.def" 3390 } 3391 } 3392 3393 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3394 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3395 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3396 if (!TL.getArg(I)) 3397 continue; 3398 3399 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3400 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3401 } 3402 } 3403 3404 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3405 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3406 } 3407 3408 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3409 // Visit the type parameters from a permissive context. 3410 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3411 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3412 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3413 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3414 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3415 // TODO: other template argument types? 3416 } 3417 } 3418 3419 // Visit pointee types from a permissive context. 3420#define CheckPolymorphic(Type) \ 3421 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3422 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3423 } 3424 CheckPolymorphic(PointerTypeLoc) 3425 CheckPolymorphic(ReferenceTypeLoc) 3426 CheckPolymorphic(MemberPointerTypeLoc) 3427 CheckPolymorphic(BlockPointerTypeLoc) 3428 CheckPolymorphic(AtomicTypeLoc) 3429 3430 /// Handle all the types we haven't given a more specific 3431 /// implementation for above. 3432 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3433 // Every other kind of type that we haven't called out already 3434 // that has an inner type is either (1) sugar or (2) contains that 3435 // inner type in some way as a subobject. 3436 if (TypeLoc Next = TL.getNextTypeLoc()) 3437 return Visit(Next, Sel); 3438 3439 // If there's no inner type and we're in a permissive context, 3440 // don't diagnose. 3441 if (Sel == Sema::AbstractNone) return; 3442 3443 // Check whether the type matches the abstract type. 3444 QualType T = TL.getType(); 3445 if (T->isArrayType()) { 3446 Sel = Sema::AbstractArrayType; 3447 T = Info.S.Context.getBaseElementType(T); 3448 } 3449 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3450 if (CT != Info.AbstractType) return; 3451 3452 // It matched; do some magic. 3453 if (Sel == Sema::AbstractArrayType) { 3454 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3455 << T << TL.getSourceRange(); 3456 } else { 3457 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3458 << Sel << T << TL.getSourceRange(); 3459 } 3460 Info.DiagnoseAbstractType(); 3461 } 3462}; 3463 3464void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3465 Sema::AbstractDiagSelID Sel) { 3466 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3467} 3468 3469} 3470 3471/// Check for invalid uses of an abstract type in a method declaration. 3472static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3473 CXXMethodDecl *MD) { 3474 // No need to do the check on definitions, which require that 3475 // the return/param types be complete. 3476 if (MD->doesThisDeclarationHaveABody()) 3477 return; 3478 3479 // For safety's sake, just ignore it if we don't have type source 3480 // information. This should never happen for non-implicit methods, 3481 // but... 3482 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3483 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3484} 3485 3486/// Check for invalid uses of an abstract type within a class definition. 3487static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3488 CXXRecordDecl *RD) { 3489 for (CXXRecordDecl::decl_iterator 3490 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3491 Decl *D = *I; 3492 if (D->isImplicit()) continue; 3493 3494 // Methods and method templates. 3495 if (isa<CXXMethodDecl>(D)) { 3496 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3497 } else if (isa<FunctionTemplateDecl>(D)) { 3498 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3499 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3500 3501 // Fields and static variables. 3502 } else if (isa<FieldDecl>(D)) { 3503 FieldDecl *FD = cast<FieldDecl>(D); 3504 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3505 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3506 } else if (isa<VarDecl>(D)) { 3507 VarDecl *VD = cast<VarDecl>(D); 3508 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3509 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3510 3511 // Nested classes and class templates. 3512 } else if (isa<CXXRecordDecl>(D)) { 3513 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3514 } else if (isa<ClassTemplateDecl>(D)) { 3515 CheckAbstractClassUsage(Info, 3516 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3517 } 3518 } 3519} 3520 3521/// \brief Perform semantic checks on a class definition that has been 3522/// completing, introducing implicitly-declared members, checking for 3523/// abstract types, etc. 3524void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3525 if (!Record) 3526 return; 3527 3528 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3529 AbstractUsageInfo Info(*this, Record); 3530 CheckAbstractClassUsage(Info, Record); 3531 } 3532 3533 // If this is not an aggregate type and has no user-declared constructor, 3534 // complain about any non-static data members of reference or const scalar 3535 // type, since they will never get initializers. 3536 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3537 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3538 bool Complained = false; 3539 for (RecordDecl::field_iterator F = Record->field_begin(), 3540 FEnd = Record->field_end(); 3541 F != FEnd; ++F) { 3542 if (F->hasInClassInitializer()) 3543 continue; 3544 3545 if (F->getType()->isReferenceType() || 3546 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3547 if (!Complained) { 3548 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3549 << Record->getTagKind() << Record; 3550 Complained = true; 3551 } 3552 3553 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3554 << F->getType()->isReferenceType() 3555 << F->getDeclName(); 3556 } 3557 } 3558 } 3559 3560 if (Record->isDynamicClass() && !Record->isDependentType()) 3561 DynamicClasses.push_back(Record); 3562 3563 if (Record->getIdentifier()) { 3564 // C++ [class.mem]p13: 3565 // If T is the name of a class, then each of the following shall have a 3566 // name different from T: 3567 // - every member of every anonymous union that is a member of class T. 3568 // 3569 // C++ [class.mem]p14: 3570 // In addition, if class T has a user-declared constructor (12.1), every 3571 // non-static data member of class T shall have a name different from T. 3572 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3573 R.first != R.second; ++R.first) { 3574 NamedDecl *D = *R.first; 3575 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3576 isa<IndirectFieldDecl>(D)) { 3577 Diag(D->getLocation(), diag::err_member_name_of_class) 3578 << D->getDeclName(); 3579 break; 3580 } 3581 } 3582 } 3583 3584 // Warn if the class has virtual methods but non-virtual public destructor. 3585 if (Record->isPolymorphic() && !Record->isDependentType()) { 3586 CXXDestructorDecl *dtor = Record->getDestructor(); 3587 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3588 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3589 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3590 } 3591 3592 // See if a method overloads virtual methods in a base 3593 /// class without overriding any. 3594 if (!Record->isDependentType()) { 3595 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3596 MEnd = Record->method_end(); 3597 M != MEnd; ++M) { 3598 if (!(*M)->isStatic()) 3599 DiagnoseHiddenVirtualMethods(Record, *M); 3600 } 3601 } 3602 3603 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3604 // function that is not a constructor declares that member function to be 3605 // const. [...] The class of which that function is a member shall be 3606 // a literal type. 3607 // 3608 // It's fine to diagnose constructors here too: such constructors cannot 3609 // produce a constant expression, so are ill-formed (no diagnostic required). 3610 // 3611 // If the class has virtual bases, any constexpr members will already have 3612 // been diagnosed by the checks performed on the member declaration, so 3613 // suppress this (less useful) diagnostic. 3614 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3615 !Record->isLiteral() && !Record->getNumVBases()) { 3616 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3617 MEnd = Record->method_end(); 3618 M != MEnd; ++M) { 3619 if ((*M)->isConstexpr()) { 3620 switch (Record->getTemplateSpecializationKind()) { 3621 case TSK_ImplicitInstantiation: 3622 case TSK_ExplicitInstantiationDeclaration: 3623 case TSK_ExplicitInstantiationDefinition: 3624 // If a template instantiates to a non-literal type, but its members 3625 // instantiate to constexpr functions, the template is technically 3626 // ill-formed, but we allow it for sanity. Such members are treated as 3627 // non-constexpr. 3628 (*M)->setConstexpr(false); 3629 continue; 3630 3631 case TSK_Undeclared: 3632 case TSK_ExplicitSpecialization: 3633 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3634 PDiag(diag::err_constexpr_method_non_literal)); 3635 break; 3636 } 3637 3638 // Only produce one error per class. 3639 break; 3640 } 3641 } 3642 } 3643 3644 // Declare inherited constructors. We do this eagerly here because: 3645 // - The standard requires an eager diagnostic for conflicting inherited 3646 // constructors from different classes. 3647 // - The lazy declaration of the other implicit constructors is so as to not 3648 // waste space and performance on classes that are not meant to be 3649 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3650 // have inherited constructors. 3651 DeclareInheritedConstructors(Record); 3652 3653 if (!Record->isDependentType()) 3654 CheckExplicitlyDefaultedMethods(Record); 3655} 3656 3657void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3658 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3659 ME = Record->method_end(); 3660 MI != ME; ++MI) { 3661 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3662 switch (getSpecialMember(*MI)) { 3663 case CXXDefaultConstructor: 3664 CheckExplicitlyDefaultedDefaultConstructor( 3665 cast<CXXConstructorDecl>(*MI)); 3666 break; 3667 3668 case CXXDestructor: 3669 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3670 break; 3671 3672 case CXXCopyConstructor: 3673 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3674 break; 3675 3676 case CXXCopyAssignment: 3677 CheckExplicitlyDefaultedCopyAssignment(*MI); 3678 break; 3679 3680 case CXXMoveConstructor: 3681 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3682 break; 3683 3684 case CXXMoveAssignment: 3685 CheckExplicitlyDefaultedMoveAssignment(*MI); 3686 break; 3687 3688 case CXXInvalid: 3689 llvm_unreachable("non-special member explicitly defaulted!"); 3690 } 3691 } 3692 } 3693 3694} 3695 3696void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3697 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3698 3699 // Whether this was the first-declared instance of the constructor. 3700 // This affects whether we implicitly add an exception spec (and, eventually, 3701 // constexpr). It is also ill-formed to explicitly default a constructor such 3702 // that it would be deleted. (C++0x [decl.fct.def.default]) 3703 bool First = CD == CD->getCanonicalDecl(); 3704 3705 bool HadError = false; 3706 if (CD->getNumParams() != 0) { 3707 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3708 << CD->getSourceRange(); 3709 HadError = true; 3710 } 3711 3712 ImplicitExceptionSpecification Spec 3713 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3714 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3715 if (EPI.ExceptionSpecType == EST_Delayed) { 3716 // Exception specification depends on some deferred part of the class. We'll 3717 // try again when the class's definition has been fully processed. 3718 return; 3719 } 3720 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3721 *ExceptionType = Context.getFunctionType( 3722 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3723 3724 if (CtorType->hasExceptionSpec()) { 3725 if (CheckEquivalentExceptionSpec( 3726 PDiag(diag::err_incorrect_defaulted_exception_spec) 3727 << CXXDefaultConstructor, 3728 PDiag(), 3729 ExceptionType, SourceLocation(), 3730 CtorType, CD->getLocation())) { 3731 HadError = true; 3732 } 3733 } else if (First) { 3734 // We set the declaration to have the computed exception spec here. 3735 // We know there are no parameters. 3736 EPI.ExtInfo = CtorType->getExtInfo(); 3737 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3738 } 3739 3740 if (HadError) { 3741 CD->setInvalidDecl(); 3742 return; 3743 } 3744 3745 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3746 if (First) { 3747 CD->setDeletedAsWritten(); 3748 } else { 3749 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3750 << CXXDefaultConstructor; 3751 CD->setInvalidDecl(); 3752 } 3753 } 3754} 3755 3756void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3757 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3758 3759 // Whether this was the first-declared instance of the constructor. 3760 bool First = CD == CD->getCanonicalDecl(); 3761 3762 bool HadError = false; 3763 if (CD->getNumParams() != 1) { 3764 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3765 << CD->getSourceRange(); 3766 HadError = true; 3767 } 3768 3769 ImplicitExceptionSpecification Spec(Context); 3770 bool Const; 3771 llvm::tie(Spec, Const) = 3772 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3773 3774 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3775 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3776 *ExceptionType = Context.getFunctionType( 3777 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3778 3779 // Check for parameter type matching. 3780 // This is a copy ctor so we know it's a cv-qualified reference to T. 3781 QualType ArgType = CtorType->getArgType(0); 3782 if (ArgType->getPointeeType().isVolatileQualified()) { 3783 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3784 HadError = true; 3785 } 3786 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3787 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3788 HadError = true; 3789 } 3790 3791 if (CtorType->hasExceptionSpec()) { 3792 if (CheckEquivalentExceptionSpec( 3793 PDiag(diag::err_incorrect_defaulted_exception_spec) 3794 << CXXCopyConstructor, 3795 PDiag(), 3796 ExceptionType, SourceLocation(), 3797 CtorType, CD->getLocation())) { 3798 HadError = true; 3799 } 3800 } else if (First) { 3801 // We set the declaration to have the computed exception spec here. 3802 // We duplicate the one parameter type. 3803 EPI.ExtInfo = CtorType->getExtInfo(); 3804 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3805 } 3806 3807 if (HadError) { 3808 CD->setInvalidDecl(); 3809 return; 3810 } 3811 3812 if (ShouldDeleteCopyConstructor(CD)) { 3813 if (First) { 3814 CD->setDeletedAsWritten(); 3815 } else { 3816 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3817 << CXXCopyConstructor; 3818 CD->setInvalidDecl(); 3819 } 3820 } 3821} 3822 3823void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3824 assert(MD->isExplicitlyDefaulted()); 3825 3826 // Whether this was the first-declared instance of the operator 3827 bool First = MD == MD->getCanonicalDecl(); 3828 3829 bool HadError = false; 3830 if (MD->getNumParams() != 1) { 3831 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3832 << MD->getSourceRange(); 3833 HadError = true; 3834 } 3835 3836 QualType ReturnType = 3837 MD->getType()->getAs<FunctionType>()->getResultType(); 3838 if (!ReturnType->isLValueReferenceType() || 3839 !Context.hasSameType( 3840 Context.getCanonicalType(ReturnType->getPointeeType()), 3841 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3842 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3843 HadError = true; 3844 } 3845 3846 ImplicitExceptionSpecification Spec(Context); 3847 bool Const; 3848 llvm::tie(Spec, Const) = 3849 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3850 3851 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3852 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3853 *ExceptionType = Context.getFunctionType( 3854 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3855 3856 QualType ArgType = OperType->getArgType(0); 3857 if (!ArgType->isLValueReferenceType()) { 3858 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3859 HadError = true; 3860 } else { 3861 if (ArgType->getPointeeType().isVolatileQualified()) { 3862 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3863 HadError = true; 3864 } 3865 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3866 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3867 HadError = true; 3868 } 3869 } 3870 3871 if (OperType->getTypeQuals()) { 3872 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3873 HadError = true; 3874 } 3875 3876 if (OperType->hasExceptionSpec()) { 3877 if (CheckEquivalentExceptionSpec( 3878 PDiag(diag::err_incorrect_defaulted_exception_spec) 3879 << CXXCopyAssignment, 3880 PDiag(), 3881 ExceptionType, SourceLocation(), 3882 OperType, MD->getLocation())) { 3883 HadError = true; 3884 } 3885 } else if (First) { 3886 // We set the declaration to have the computed exception spec here. 3887 // We duplicate the one parameter type. 3888 EPI.RefQualifier = OperType->getRefQualifier(); 3889 EPI.ExtInfo = OperType->getExtInfo(); 3890 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3891 } 3892 3893 if (HadError) { 3894 MD->setInvalidDecl(); 3895 return; 3896 } 3897 3898 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3899 if (First) { 3900 MD->setDeletedAsWritten(); 3901 } else { 3902 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3903 << CXXCopyAssignment; 3904 MD->setInvalidDecl(); 3905 } 3906 } 3907} 3908 3909void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3910 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3911 3912 // Whether this was the first-declared instance of the constructor. 3913 bool First = CD == CD->getCanonicalDecl(); 3914 3915 bool HadError = false; 3916 if (CD->getNumParams() != 1) { 3917 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3918 << CD->getSourceRange(); 3919 HadError = true; 3920 } 3921 3922 ImplicitExceptionSpecification Spec( 3923 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3924 3925 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3926 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3927 *ExceptionType = Context.getFunctionType( 3928 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3929 3930 // Check for parameter type matching. 3931 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3932 QualType ArgType = CtorType->getArgType(0); 3933 if (ArgType->getPointeeType().isVolatileQualified()) { 3934 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3935 HadError = true; 3936 } 3937 if (ArgType->getPointeeType().isConstQualified()) { 3938 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3939 HadError = true; 3940 } 3941 3942 if (CtorType->hasExceptionSpec()) { 3943 if (CheckEquivalentExceptionSpec( 3944 PDiag(diag::err_incorrect_defaulted_exception_spec) 3945 << CXXMoveConstructor, 3946 PDiag(), 3947 ExceptionType, SourceLocation(), 3948 CtorType, CD->getLocation())) { 3949 HadError = true; 3950 } 3951 } else if (First) { 3952 // We set the declaration to have the computed exception spec here. 3953 // We duplicate the one parameter type. 3954 EPI.ExtInfo = CtorType->getExtInfo(); 3955 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3956 } 3957 3958 if (HadError) { 3959 CD->setInvalidDecl(); 3960 return; 3961 } 3962 3963 if (ShouldDeleteMoveConstructor(CD)) { 3964 if (First) { 3965 CD->setDeletedAsWritten(); 3966 } else { 3967 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3968 << CXXMoveConstructor; 3969 CD->setInvalidDecl(); 3970 } 3971 } 3972} 3973 3974void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3975 assert(MD->isExplicitlyDefaulted()); 3976 3977 // Whether this was the first-declared instance of the operator 3978 bool First = MD == MD->getCanonicalDecl(); 3979 3980 bool HadError = false; 3981 if (MD->getNumParams() != 1) { 3982 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3983 << MD->getSourceRange(); 3984 HadError = true; 3985 } 3986 3987 QualType ReturnType = 3988 MD->getType()->getAs<FunctionType>()->getResultType(); 3989 if (!ReturnType->isLValueReferenceType() || 3990 !Context.hasSameType( 3991 Context.getCanonicalType(ReturnType->getPointeeType()), 3992 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3993 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3994 HadError = true; 3995 } 3996 3997 ImplicitExceptionSpecification Spec( 3998 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3999 4000 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4001 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4002 *ExceptionType = Context.getFunctionType( 4003 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4004 4005 QualType ArgType = OperType->getArgType(0); 4006 if (!ArgType->isRValueReferenceType()) { 4007 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4008 HadError = true; 4009 } else { 4010 if (ArgType->getPointeeType().isVolatileQualified()) { 4011 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4012 HadError = true; 4013 } 4014 if (ArgType->getPointeeType().isConstQualified()) { 4015 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4016 HadError = true; 4017 } 4018 } 4019 4020 if (OperType->getTypeQuals()) { 4021 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4022 HadError = true; 4023 } 4024 4025 if (OperType->hasExceptionSpec()) { 4026 if (CheckEquivalentExceptionSpec( 4027 PDiag(diag::err_incorrect_defaulted_exception_spec) 4028 << CXXMoveAssignment, 4029 PDiag(), 4030 ExceptionType, SourceLocation(), 4031 OperType, MD->getLocation())) { 4032 HadError = true; 4033 } 4034 } else if (First) { 4035 // We set the declaration to have the computed exception spec here. 4036 // We duplicate the one parameter type. 4037 EPI.RefQualifier = OperType->getRefQualifier(); 4038 EPI.ExtInfo = OperType->getExtInfo(); 4039 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4040 } 4041 4042 if (HadError) { 4043 MD->setInvalidDecl(); 4044 return; 4045 } 4046 4047 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4048 if (First) { 4049 MD->setDeletedAsWritten(); 4050 } else { 4051 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4052 << CXXMoveAssignment; 4053 MD->setInvalidDecl(); 4054 } 4055 } 4056} 4057 4058void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4059 assert(DD->isExplicitlyDefaulted()); 4060 4061 // Whether this was the first-declared instance of the destructor. 4062 bool First = DD == DD->getCanonicalDecl(); 4063 4064 ImplicitExceptionSpecification Spec 4065 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4066 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4067 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4068 *ExceptionType = Context.getFunctionType( 4069 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4070 4071 if (DtorType->hasExceptionSpec()) { 4072 if (CheckEquivalentExceptionSpec( 4073 PDiag(diag::err_incorrect_defaulted_exception_spec) 4074 << CXXDestructor, 4075 PDiag(), 4076 ExceptionType, SourceLocation(), 4077 DtorType, DD->getLocation())) { 4078 DD->setInvalidDecl(); 4079 return; 4080 } 4081 } else if (First) { 4082 // We set the declaration to have the computed exception spec here. 4083 // There are no parameters. 4084 EPI.ExtInfo = DtorType->getExtInfo(); 4085 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4086 } 4087 4088 if (ShouldDeleteDestructor(DD)) { 4089 if (First) { 4090 DD->setDeletedAsWritten(); 4091 } else { 4092 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4093 << CXXDestructor; 4094 DD->setInvalidDecl(); 4095 } 4096 } 4097} 4098 4099/// This function implements the following C++0x paragraphs: 4100/// - [class.ctor]/5 4101bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4102 assert(!MD->isInvalidDecl()); 4103 CXXRecordDecl *RD = MD->getParent(); 4104 assert(!RD->isDependentType() && "do deletion after instantiation"); 4105 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4106 return false; 4107 4108 bool IsUnion = RD->isUnion(); 4109 bool IsConstructor = false; 4110 bool IsAssignment = false; 4111 bool IsMove = false; 4112 4113 bool ConstArg = false; 4114 4115 switch (CSM) { 4116 case CXXDefaultConstructor: 4117 IsConstructor = true; 4118 break; 4119 default: 4120 llvm_unreachable("function only currently implemented for default ctors"); 4121 } 4122 4123 SourceLocation Loc = MD->getLocation(); 4124 4125 // Do access control from the constructor 4126 ContextRAII MethodContext(*this, MD); 4127 4128 bool AllConst = true; 4129 4130 // We do this because we should never actually use an anonymous 4131 // union's constructor. 4132 if (IsUnion && RD->isAnonymousStructOrUnion()) 4133 return false; 4134 4135 // FIXME: We should put some diagnostic logic right into this function. 4136 4137 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4138 BE = RD->bases_end(); 4139 BI != BE; ++BI) { 4140 // We'll handle this one later 4141 if (BI->isVirtual()) 4142 continue; 4143 4144 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4145 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4146 4147 // Unless we have an assignment operator, the base's destructor must 4148 // be accessible and not deleted. 4149 if (!IsAssignment) { 4150 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4151 if (BaseDtor->isDeleted()) 4152 return true; 4153 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4154 AR_accessible) 4155 return true; 4156 } 4157 4158 // Finding the corresponding member in the base should lead to a 4159 // unique, accessible, non-deleted function. 4160 if (CSM != CXXDestructor) { 4161 SpecialMemberOverloadResult *SMOR = 4162 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4163 false); 4164 if (!SMOR->hasSuccess()) 4165 return true; 4166 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4167 if (IsConstructor) { 4168 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4169 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4170 PDiag()) != AR_accessible) 4171 return true; 4172 } 4173 } 4174 } 4175 4176 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4177 BE = RD->vbases_end(); 4178 BI != BE; ++BI) { 4179 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4180 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4181 4182 // Unless we have an assignment operator, the base's destructor must 4183 // be accessible and not deleted. 4184 if (!IsAssignment) { 4185 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4186 if (BaseDtor->isDeleted()) 4187 return true; 4188 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4189 AR_accessible) 4190 return true; 4191 } 4192 4193 // Finding the corresponding member in the base should lead to a 4194 // unique, accessible, non-deleted function. 4195 if (CSM != CXXDestructor) { 4196 SpecialMemberOverloadResult *SMOR = 4197 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4198 false); 4199 if (!SMOR->hasSuccess()) 4200 return true; 4201 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4202 if (IsConstructor) { 4203 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4204 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4205 PDiag()) != AR_accessible) 4206 return true; 4207 } 4208 } 4209 } 4210 4211 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4212 FE = RD->field_end(); 4213 FI != FE; ++FI) { 4214 if (FI->isInvalidDecl()) 4215 continue; 4216 4217 QualType FieldType = Context.getBaseElementType(FI->getType()); 4218 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4219 4220 // For a default constructor, all references must be initialized in-class 4221 // and, if a union, it must have a non-const member. 4222 if (CSM == CXXDefaultConstructor) { 4223 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4224 return true; 4225 4226 if (IsUnion && !FieldType.isConstQualified()) 4227 AllConst = false; 4228 } 4229 4230 if (FieldRecord) { 4231 // Unless we're doing assignment, the field's destructor must be 4232 // accessible and not deleted. 4233 if (!IsAssignment) { 4234 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4235 if (FieldDtor->isDeleted()) 4236 return true; 4237 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4238 AR_accessible) 4239 return true; 4240 } 4241 4242 // For a default constructor, a const member must have a user-provided 4243 // default constructor or else be explicitly initialized. 4244 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4245 !FI->hasInClassInitializer() && 4246 !FieldRecord->hasUserProvidedDefaultConstructor()) 4247 return true; 4248 4249 // For a default constructor, additional restrictions exist on the 4250 // variant members. 4251 if (CSM == CXXDefaultConstructor && !IsUnion && FieldRecord->isUnion() && 4252 FieldRecord->isAnonymousStructOrUnion()) { 4253 // We're okay to reuse AllConst here since we only care about the 4254 // value otherwise if we're in a union. 4255 AllConst = true; 4256 4257 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4258 UE = FieldRecord->field_end(); 4259 UI != UE; ++UI) { 4260 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4261 CXXRecordDecl *UnionFieldRecord = 4262 UnionFieldType->getAsCXXRecordDecl(); 4263 4264 if (!UnionFieldType.isConstQualified()) 4265 AllConst = false; 4266 4267 if (UnionFieldRecord && 4268 !UnionFieldRecord->hasTrivialDefaultConstructor()) 4269 return true; 4270 } 4271 4272 if (AllConst) 4273 return true; 4274 4275 // Don't try to initialize the anonymous union 4276 // This is technically non-conformant, but sanity demands it. 4277 continue; 4278 } 4279 4280 // Check that the corresponding member of the field is accessible, 4281 // unique, and non-deleted. We don't do this if it has an explicit 4282 // initialization when default-constructing. 4283 if (CSM != CXXDestructor && 4284 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4285 SpecialMemberOverloadResult *SMOR = 4286 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, IsMove, false, 4287 false); 4288 if (!SMOR->hasSuccess()) 4289 return true; 4290 4291 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4292 if (IsConstructor) { 4293 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4294 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4295 PDiag()) != AR_accessible) 4296 return true; 4297 } 4298 4299 // We need the corresponding member of a union to be trivial so that 4300 // we can safely copy them all simultaneously. 4301 // FIXME: Note that performing the check here (where we rely on the lack 4302 // of an in-class initializer) is technically ill-formed. However, this 4303 // seems most obviously to be a bug in the standard. 4304 if (IsUnion && !FieldMember->isTrivial()) 4305 return true; 4306 } 4307 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4308 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4309 // We can't initialize a const member of non-class type to any value. 4310 return true; 4311 } 4312 } 4313 4314 // We can't have all const members in a union when default-constructing, 4315 // or else they're all nonsensical garbage values that can't be changed. 4316 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4317 return true; 4318 4319 return false; 4320} 4321 4322bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 4323 CXXRecordDecl *RD = CD->getParent(); 4324 assert(!RD->isDependentType() && "do deletion after instantiation"); 4325 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4326 return false; 4327 4328 SourceLocation Loc = CD->getLocation(); 4329 4330 // Do access control from the constructor 4331 ContextRAII CtorContext(*this, CD); 4332 4333 bool Union = RD->isUnion(); 4334 4335 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4336 "copy assignment arg has no pointee type"); 4337 unsigned ArgQuals = 4338 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4339 Qualifiers::Const : 0; 4340 4341 // We do this because we should never actually use an anonymous 4342 // union's constructor. 4343 if (Union && RD->isAnonymousStructOrUnion()) 4344 return false; 4345 4346 // FIXME: We should put some diagnostic logic right into this function. 4347 4348 // C++0x [class.copy]/11 4349 // A defaulted [copy] constructor for class X is defined as delete if X has: 4350 4351 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4352 BE = RD->bases_end(); 4353 BI != BE; ++BI) { 4354 // We'll handle this one later 4355 if (BI->isVirtual()) 4356 continue; 4357 4358 QualType BaseType = BI->getType(); 4359 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4360 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4361 4362 // -- any [direct base class] of a type with a destructor that is deleted or 4363 // inaccessible from the defaulted constructor 4364 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4365 if (BaseDtor->isDeleted()) 4366 return true; 4367 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4368 AR_accessible) 4369 return true; 4370 4371 // -- a [direct base class] B that cannot be [copied] because overload 4372 // resolution, as applied to B's [copy] constructor, results in an 4373 // ambiguity or a function that is deleted or inaccessible from the 4374 // defaulted constructor 4375 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4376 if (!BaseCtor || BaseCtor->isDeleted()) 4377 return true; 4378 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4379 AR_accessible) 4380 return true; 4381 } 4382 4383 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4384 BE = RD->vbases_end(); 4385 BI != BE; ++BI) { 4386 QualType BaseType = BI->getType(); 4387 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4388 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4389 4390 // -- any [virtual base class] of a type with a destructor that is deleted or 4391 // inaccessible from the defaulted constructor 4392 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4393 if (BaseDtor->isDeleted()) 4394 return true; 4395 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4396 AR_accessible) 4397 return true; 4398 4399 // -- a [virtual base class] B that cannot be [copied] because overload 4400 // resolution, as applied to B's [copy] constructor, results in an 4401 // ambiguity or a function that is deleted or inaccessible from the 4402 // defaulted constructor 4403 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4404 if (!BaseCtor || BaseCtor->isDeleted()) 4405 return true; 4406 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4407 AR_accessible) 4408 return true; 4409 } 4410 4411 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4412 FE = RD->field_end(); 4413 FI != FE; ++FI) { 4414 QualType FieldType = Context.getBaseElementType(FI->getType()); 4415 4416 // -- for a copy constructor, a non-static data member of rvalue reference 4417 // type 4418 if (FieldType->isRValueReferenceType()) 4419 return true; 4420 4421 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4422 4423 if (FieldRecord) { 4424 // This is an anonymous union 4425 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4426 // Anonymous unions inside unions do not variant members create 4427 if (!Union) { 4428 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4429 UE = FieldRecord->field_end(); 4430 UI != UE; ++UI) { 4431 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4432 CXXRecordDecl *UnionFieldRecord = 4433 UnionFieldType->getAsCXXRecordDecl(); 4434 4435 // -- a variant member with a non-trivial [copy] constructor and X 4436 // is a union-like class 4437 if (UnionFieldRecord && 4438 !UnionFieldRecord->hasTrivialCopyConstructor()) 4439 return true; 4440 } 4441 } 4442 4443 // Don't try to initalize an anonymous union 4444 continue; 4445 } else { 4446 // -- a variant member with a non-trivial [copy] constructor and X is a 4447 // union-like class 4448 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 4449 return true; 4450 4451 // -- any [non-static data member] of a type with a destructor that is 4452 // deleted or inaccessible from the defaulted constructor 4453 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4454 if (FieldDtor->isDeleted()) 4455 return true; 4456 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4457 AR_accessible) 4458 return true; 4459 } 4460 4461 // -- a [non-static data member of class type (or array thereof)] B that 4462 // cannot be [copied] because overload resolution, as applied to B's 4463 // [copy] constructor, results in an ambiguity or a function that is 4464 // deleted or inaccessible from the defaulted constructor 4465 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 4466 ArgQuals); 4467 if (!FieldCtor || FieldCtor->isDeleted()) 4468 return true; 4469 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4470 PDiag()) != AR_accessible) 4471 return true; 4472 } 4473 } 4474 4475 return false; 4476} 4477 4478bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4479 CXXRecordDecl *RD = MD->getParent(); 4480 assert(!RD->isDependentType() && "do deletion after instantiation"); 4481 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4482 return false; 4483 4484 SourceLocation Loc = MD->getLocation(); 4485 4486 // Do access control from the constructor 4487 ContextRAII MethodContext(*this, MD); 4488 4489 bool Union = RD->isUnion(); 4490 4491 unsigned ArgQuals = 4492 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4493 Qualifiers::Const : 0; 4494 4495 // We do this because we should never actually use an anonymous 4496 // union's constructor. 4497 if (Union && RD->isAnonymousStructOrUnion()) 4498 return false; 4499 4500 // FIXME: We should put some diagnostic logic right into this function. 4501 4502 // C++0x [class.copy]/20 4503 // A defaulted [copy] assignment operator for class X is defined as deleted 4504 // if X has: 4505 4506 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4507 BE = RD->bases_end(); 4508 BI != BE; ++BI) { 4509 // We'll handle this one later 4510 if (BI->isVirtual()) 4511 continue; 4512 4513 QualType BaseType = BI->getType(); 4514 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4515 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4516 4517 // -- a [direct base class] B that cannot be [copied] because overload 4518 // resolution, as applied to B's [copy] assignment operator, results in 4519 // an ambiguity or a function that is deleted or inaccessible from the 4520 // assignment operator 4521 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4522 0); 4523 if (!CopyOper || CopyOper->isDeleted()) 4524 return true; 4525 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4526 return true; 4527 } 4528 4529 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4530 BE = RD->vbases_end(); 4531 BI != BE; ++BI) { 4532 QualType BaseType = BI->getType(); 4533 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4534 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4535 4536 // -- a [virtual base class] B that cannot be [copied] because overload 4537 // resolution, as applied to B's [copy] assignment operator, results in 4538 // an ambiguity or a function that is deleted or inaccessible from the 4539 // assignment operator 4540 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4541 0); 4542 if (!CopyOper || CopyOper->isDeleted()) 4543 return true; 4544 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4545 return true; 4546 } 4547 4548 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4549 FE = RD->field_end(); 4550 FI != FE; ++FI) { 4551 QualType FieldType = Context.getBaseElementType(FI->getType()); 4552 4553 // -- a non-static data member of reference type 4554 if (FieldType->isReferenceType()) 4555 return true; 4556 4557 // -- a non-static data member of const non-class type (or array thereof) 4558 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4559 return true; 4560 4561 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4562 4563 if (FieldRecord) { 4564 // This is an anonymous union 4565 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4566 // Anonymous unions inside unions do not variant members create 4567 if (!Union) { 4568 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4569 UE = FieldRecord->field_end(); 4570 UI != UE; ++UI) { 4571 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4572 CXXRecordDecl *UnionFieldRecord = 4573 UnionFieldType->getAsCXXRecordDecl(); 4574 4575 // -- a variant member with a non-trivial [copy] assignment operator 4576 // and X is a union-like class 4577 if (UnionFieldRecord && 4578 !UnionFieldRecord->hasTrivialCopyAssignment()) 4579 return true; 4580 } 4581 } 4582 4583 // Don't try to initalize an anonymous union 4584 continue; 4585 // -- a variant member with a non-trivial [copy] assignment operator 4586 // and X is a union-like class 4587 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4588 return true; 4589 } 4590 4591 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4592 false, 0); 4593 if (!CopyOper || CopyOper->isDeleted()) 4594 return true; 4595 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4596 return true; 4597 } 4598 } 4599 4600 return false; 4601} 4602 4603bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4604 CXXRecordDecl *RD = CD->getParent(); 4605 assert(!RD->isDependentType() && "do deletion after instantiation"); 4606 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4607 return false; 4608 4609 SourceLocation Loc = CD->getLocation(); 4610 4611 // Do access control from the constructor 4612 ContextRAII CtorContext(*this, CD); 4613 4614 bool Union = RD->isUnion(); 4615 4616 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4617 "copy assignment arg has no pointee type"); 4618 4619 // We do this because we should never actually use an anonymous 4620 // union's constructor. 4621 if (Union && RD->isAnonymousStructOrUnion()) 4622 return false; 4623 4624 // C++0x [class.copy]/11 4625 // A defaulted [move] constructor for class X is defined as deleted 4626 // if X has: 4627 4628 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4629 BE = RD->bases_end(); 4630 BI != BE; ++BI) { 4631 // We'll handle this one later 4632 if (BI->isVirtual()) 4633 continue; 4634 4635 QualType BaseType = BI->getType(); 4636 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4637 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4638 4639 // -- any [direct base class] of a type with a destructor that is deleted or 4640 // inaccessible from the defaulted constructor 4641 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4642 if (BaseDtor->isDeleted()) 4643 return true; 4644 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4645 AR_accessible) 4646 return true; 4647 4648 // -- a [direct base class] B that cannot be [moved] because overload 4649 // resolution, as applied to B's [move] constructor, results in an 4650 // ambiguity or a function that is deleted or inaccessible from the 4651 // defaulted constructor 4652 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4653 if (!BaseCtor || BaseCtor->isDeleted()) 4654 return true; 4655 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4656 AR_accessible) 4657 return true; 4658 4659 // -- for a move constructor, a [direct base class] with a type that 4660 // does not have a move constructor and is not trivially copyable. 4661 // If the field isn't a record, it's always trivially copyable. 4662 // A moving constructor could be a copy constructor instead. 4663 if (!BaseCtor->isMoveConstructor() && 4664 !BaseDecl->isTriviallyCopyable()) 4665 return true; 4666 } 4667 4668 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4669 BE = RD->vbases_end(); 4670 BI != BE; ++BI) { 4671 QualType BaseType = BI->getType(); 4672 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4673 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4674 4675 // -- any [virtual base class] of a type with a destructor that is deleted 4676 // or inaccessible from the defaulted constructor 4677 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4678 if (BaseDtor->isDeleted()) 4679 return true; 4680 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4681 AR_accessible) 4682 return true; 4683 4684 // -- a [virtual base class] B that cannot be [moved] because overload 4685 // resolution, as applied to B's [move] constructor, results in an 4686 // ambiguity or a function that is deleted or inaccessible from the 4687 // defaulted constructor 4688 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4689 if (!BaseCtor || BaseCtor->isDeleted()) 4690 return true; 4691 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4692 AR_accessible) 4693 return true; 4694 4695 // -- for a move constructor, a [virtual base class] with a type that 4696 // does not have a move constructor and is not trivially copyable. 4697 // If the field isn't a record, it's always trivially copyable. 4698 // A moving constructor could be a copy constructor instead. 4699 if (!BaseCtor->isMoveConstructor() && 4700 !BaseDecl->isTriviallyCopyable()) 4701 return true; 4702 } 4703 4704 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4705 FE = RD->field_end(); 4706 FI != FE; ++FI) { 4707 QualType FieldType = Context.getBaseElementType(FI->getType()); 4708 4709 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4710 // This is an anonymous union 4711 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4712 // Anonymous unions inside unions do not variant members create 4713 if (!Union) { 4714 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4715 UE = FieldRecord->field_end(); 4716 UI != UE; ++UI) { 4717 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4718 CXXRecordDecl *UnionFieldRecord = 4719 UnionFieldType->getAsCXXRecordDecl(); 4720 4721 // -- a variant member with a non-trivial [move] constructor and X 4722 // is a union-like class 4723 if (UnionFieldRecord && 4724 !UnionFieldRecord->hasTrivialMoveConstructor()) 4725 return true; 4726 } 4727 } 4728 4729 // Don't try to initalize an anonymous union 4730 continue; 4731 } else { 4732 // -- a variant member with a non-trivial [move] constructor and X is a 4733 // union-like class 4734 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4735 return true; 4736 4737 // -- any [non-static data member] of a type with a destructor that is 4738 // deleted or inaccessible from the defaulted constructor 4739 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4740 if (FieldDtor->isDeleted()) 4741 return true; 4742 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4743 AR_accessible) 4744 return true; 4745 } 4746 4747 // -- a [non-static data member of class type (or array thereof)] B that 4748 // cannot be [moved] because overload resolution, as applied to B's 4749 // [move] constructor, results in an ambiguity or a function that is 4750 // deleted or inaccessible from the defaulted constructor 4751 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4752 if (!FieldCtor || FieldCtor->isDeleted()) 4753 return true; 4754 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4755 PDiag()) != AR_accessible) 4756 return true; 4757 4758 // -- for a move constructor, a [non-static data member] with a type that 4759 // does not have a move constructor and is not trivially copyable. 4760 // If the field isn't a record, it's always trivially copyable. 4761 // A moving constructor could be a copy constructor instead. 4762 if (!FieldCtor->isMoveConstructor() && 4763 !FieldRecord->isTriviallyCopyable()) 4764 return true; 4765 } 4766 } 4767 4768 return false; 4769} 4770 4771bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4772 CXXRecordDecl *RD = MD->getParent(); 4773 assert(!RD->isDependentType() && "do deletion after instantiation"); 4774 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4775 return false; 4776 4777 SourceLocation Loc = MD->getLocation(); 4778 4779 // Do access control from the constructor 4780 ContextRAII MethodContext(*this, MD); 4781 4782 bool Union = RD->isUnion(); 4783 4784 // We do this because we should never actually use an anonymous 4785 // union's constructor. 4786 if (Union && RD->isAnonymousStructOrUnion()) 4787 return false; 4788 4789 // C++0x [class.copy]/20 4790 // A defaulted [move] assignment operator for class X is defined as deleted 4791 // if X has: 4792 4793 // -- for the move constructor, [...] any direct or indirect virtual base 4794 // class. 4795 if (RD->getNumVBases() != 0) 4796 return true; 4797 4798 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4799 BE = RD->bases_end(); 4800 BI != BE; ++BI) { 4801 4802 QualType BaseType = BI->getType(); 4803 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4804 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4805 4806 // -- a [direct base class] B that cannot be [moved] because overload 4807 // resolution, as applied to B's [move] assignment operator, results in 4808 // an ambiguity or a function that is deleted or inaccessible from the 4809 // assignment operator 4810 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4811 if (!MoveOper || MoveOper->isDeleted()) 4812 return true; 4813 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4814 return true; 4815 4816 // -- for the move assignment operator, a [direct base class] with a type 4817 // that does not have a move assignment operator and is not trivially 4818 // copyable. 4819 if (!MoveOper->isMoveAssignmentOperator() && 4820 !BaseDecl->isTriviallyCopyable()) 4821 return true; 4822 } 4823 4824 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4825 FE = RD->field_end(); 4826 FI != FE; ++FI) { 4827 QualType FieldType = Context.getBaseElementType(FI->getType()); 4828 4829 // -- a non-static data member of reference type 4830 if (FieldType->isReferenceType()) 4831 return true; 4832 4833 // -- a non-static data member of const non-class type (or array thereof) 4834 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4835 return true; 4836 4837 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4838 4839 if (FieldRecord) { 4840 // This is an anonymous union 4841 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4842 // Anonymous unions inside unions do not variant members create 4843 if (!Union) { 4844 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4845 UE = FieldRecord->field_end(); 4846 UI != UE; ++UI) { 4847 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4848 CXXRecordDecl *UnionFieldRecord = 4849 UnionFieldType->getAsCXXRecordDecl(); 4850 4851 // -- a variant member with a non-trivial [move] assignment operator 4852 // and X is a union-like class 4853 if (UnionFieldRecord && 4854 !UnionFieldRecord->hasTrivialMoveAssignment()) 4855 return true; 4856 } 4857 } 4858 4859 // Don't try to initalize an anonymous union 4860 continue; 4861 // -- a variant member with a non-trivial [move] assignment operator 4862 // and X is a union-like class 4863 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4864 return true; 4865 } 4866 4867 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4868 if (!MoveOper || MoveOper->isDeleted()) 4869 return true; 4870 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4871 return true; 4872 4873 // -- for the move assignment operator, a [non-static data member] with a 4874 // type that does not have a move assignment operator and is not 4875 // trivially copyable. 4876 if (!MoveOper->isMoveAssignmentOperator() && 4877 !FieldRecord->isTriviallyCopyable()) 4878 return true; 4879 } 4880 } 4881 4882 return false; 4883} 4884 4885bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4886 CXXRecordDecl *RD = DD->getParent(); 4887 assert(!RD->isDependentType() && "do deletion after instantiation"); 4888 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4889 return false; 4890 4891 SourceLocation Loc = DD->getLocation(); 4892 4893 // Do access control from the destructor 4894 ContextRAII CtorContext(*this, DD); 4895 4896 bool Union = RD->isUnion(); 4897 4898 // We do this because we should never actually use an anonymous 4899 // union's destructor. 4900 if (Union && RD->isAnonymousStructOrUnion()) 4901 return false; 4902 4903 // C++0x [class.dtor]p5 4904 // A defaulted destructor for a class X is defined as deleted if: 4905 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4906 BE = RD->bases_end(); 4907 BI != BE; ++BI) { 4908 // We'll handle this one later 4909 if (BI->isVirtual()) 4910 continue; 4911 4912 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4913 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4914 assert(BaseDtor && "base has no destructor"); 4915 4916 // -- any direct or virtual base class has a deleted destructor or 4917 // a destructor that is inaccessible from the defaulted destructor 4918 if (BaseDtor->isDeleted()) 4919 return true; 4920 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4921 AR_accessible) 4922 return true; 4923 } 4924 4925 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4926 BE = RD->vbases_end(); 4927 BI != BE; ++BI) { 4928 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4929 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4930 assert(BaseDtor && "base has no destructor"); 4931 4932 // -- any direct or virtual base class has a deleted destructor or 4933 // a destructor that is inaccessible from the defaulted destructor 4934 if (BaseDtor->isDeleted()) 4935 return true; 4936 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4937 AR_accessible) 4938 return true; 4939 } 4940 4941 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4942 FE = RD->field_end(); 4943 FI != FE; ++FI) { 4944 QualType FieldType = Context.getBaseElementType(FI->getType()); 4945 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4946 if (FieldRecord) { 4947 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4948 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4949 UE = FieldRecord->field_end(); 4950 UI != UE; ++UI) { 4951 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4952 CXXRecordDecl *UnionFieldRecord = 4953 UnionFieldType->getAsCXXRecordDecl(); 4954 4955 // -- X is a union-like class that has a variant member with a non- 4956 // trivial destructor. 4957 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4958 return true; 4959 } 4960 // Technically we are supposed to do this next check unconditionally. 4961 // But that makes absolutely no sense. 4962 } else { 4963 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4964 4965 // -- any of the non-static data members has class type M (or array 4966 // thereof) and M has a deleted destructor or a destructor that is 4967 // inaccessible from the defaulted destructor 4968 if (FieldDtor->isDeleted()) 4969 return true; 4970 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4971 AR_accessible) 4972 return true; 4973 4974 // -- X is a union-like class that has a variant member with a non- 4975 // trivial destructor. 4976 if (Union && !FieldDtor->isTrivial()) 4977 return true; 4978 } 4979 } 4980 } 4981 4982 if (DD->isVirtual()) { 4983 FunctionDecl *OperatorDelete = 0; 4984 DeclarationName Name = 4985 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4986 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4987 false)) 4988 return true; 4989 } 4990 4991 4992 return false; 4993} 4994 4995/// \brief Data used with FindHiddenVirtualMethod 4996namespace { 4997 struct FindHiddenVirtualMethodData { 4998 Sema *S; 4999 CXXMethodDecl *Method; 5000 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5001 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5002 }; 5003} 5004 5005/// \brief Member lookup function that determines whether a given C++ 5006/// method overloads virtual methods in a base class without overriding any, 5007/// to be used with CXXRecordDecl::lookupInBases(). 5008static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5009 CXXBasePath &Path, 5010 void *UserData) { 5011 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5012 5013 FindHiddenVirtualMethodData &Data 5014 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5015 5016 DeclarationName Name = Data.Method->getDeclName(); 5017 assert(Name.getNameKind() == DeclarationName::Identifier); 5018 5019 bool foundSameNameMethod = false; 5020 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5021 for (Path.Decls = BaseRecord->lookup(Name); 5022 Path.Decls.first != Path.Decls.second; 5023 ++Path.Decls.first) { 5024 NamedDecl *D = *Path.Decls.first; 5025 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5026 MD = MD->getCanonicalDecl(); 5027 foundSameNameMethod = true; 5028 // Interested only in hidden virtual methods. 5029 if (!MD->isVirtual()) 5030 continue; 5031 // If the method we are checking overrides a method from its base 5032 // don't warn about the other overloaded methods. 5033 if (!Data.S->IsOverload(Data.Method, MD, false)) 5034 return true; 5035 // Collect the overload only if its hidden. 5036 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 5037 overloadedMethods.push_back(MD); 5038 } 5039 } 5040 5041 if (foundSameNameMethod) 5042 Data.OverloadedMethods.append(overloadedMethods.begin(), 5043 overloadedMethods.end()); 5044 return foundSameNameMethod; 5045} 5046 5047/// \brief See if a method overloads virtual methods in a base class without 5048/// overriding any. 5049void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5050 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5051 MD->getLocation()) == DiagnosticsEngine::Ignored) 5052 return; 5053 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 5054 return; 5055 5056 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5057 /*bool RecordPaths=*/false, 5058 /*bool DetectVirtual=*/false); 5059 FindHiddenVirtualMethodData Data; 5060 Data.Method = MD; 5061 Data.S = this; 5062 5063 // Keep the base methods that were overriden or introduced in the subclass 5064 // by 'using' in a set. A base method not in this set is hidden. 5065 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 5066 res.first != res.second; ++res.first) { 5067 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 5068 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5069 E = MD->end_overridden_methods(); 5070 I != E; ++I) 5071 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 5072 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 5073 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 5074 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 5075 } 5076 5077 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5078 !Data.OverloadedMethods.empty()) { 5079 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5080 << MD << (Data.OverloadedMethods.size() > 1); 5081 5082 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5083 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5084 Diag(overloadedMD->getLocation(), 5085 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5086 } 5087 } 5088} 5089 5090void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5091 Decl *TagDecl, 5092 SourceLocation LBrac, 5093 SourceLocation RBrac, 5094 AttributeList *AttrList) { 5095 if (!TagDecl) 5096 return; 5097 5098 AdjustDeclIfTemplate(TagDecl); 5099 5100 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5101 // strict aliasing violation! 5102 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5103 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5104 5105 CheckCompletedCXXClass( 5106 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5107} 5108 5109/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5110/// special functions, such as the default constructor, copy 5111/// constructor, or destructor, to the given C++ class (C++ 5112/// [special]p1). This routine can only be executed just before the 5113/// definition of the class is complete. 5114void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5115 if (!ClassDecl->hasUserDeclaredConstructor()) 5116 ++ASTContext::NumImplicitDefaultConstructors; 5117 5118 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5119 ++ASTContext::NumImplicitCopyConstructors; 5120 5121 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5122 ++ASTContext::NumImplicitCopyAssignmentOperators; 5123 5124 // If we have a dynamic class, then the copy assignment operator may be 5125 // virtual, so we have to declare it immediately. This ensures that, e.g., 5126 // it shows up in the right place in the vtable and that we diagnose 5127 // problems with the implicit exception specification. 5128 if (ClassDecl->isDynamicClass()) 5129 DeclareImplicitCopyAssignment(ClassDecl); 5130 } 5131 5132 if (!ClassDecl->hasUserDeclaredDestructor()) { 5133 ++ASTContext::NumImplicitDestructors; 5134 5135 // If we have a dynamic class, then the destructor may be virtual, so we 5136 // have to declare the destructor immediately. This ensures that, e.g., it 5137 // shows up in the right place in the vtable and that we diagnose problems 5138 // with the implicit exception specification. 5139 if (ClassDecl->isDynamicClass()) 5140 DeclareImplicitDestructor(ClassDecl); 5141 } 5142} 5143 5144void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5145 if (!D) 5146 return; 5147 5148 int NumParamList = D->getNumTemplateParameterLists(); 5149 for (int i = 0; i < NumParamList; i++) { 5150 TemplateParameterList* Params = D->getTemplateParameterList(i); 5151 for (TemplateParameterList::iterator Param = Params->begin(), 5152 ParamEnd = Params->end(); 5153 Param != ParamEnd; ++Param) { 5154 NamedDecl *Named = cast<NamedDecl>(*Param); 5155 if (Named->getDeclName()) { 5156 S->AddDecl(Named); 5157 IdResolver.AddDecl(Named); 5158 } 5159 } 5160 } 5161} 5162 5163void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5164 if (!D) 5165 return; 5166 5167 TemplateParameterList *Params = 0; 5168 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5169 Params = Template->getTemplateParameters(); 5170 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5171 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5172 Params = PartialSpec->getTemplateParameters(); 5173 else 5174 return; 5175 5176 for (TemplateParameterList::iterator Param = Params->begin(), 5177 ParamEnd = Params->end(); 5178 Param != ParamEnd; ++Param) { 5179 NamedDecl *Named = cast<NamedDecl>(*Param); 5180 if (Named->getDeclName()) { 5181 S->AddDecl(Named); 5182 IdResolver.AddDecl(Named); 5183 } 5184 } 5185} 5186 5187void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5188 if (!RecordD) return; 5189 AdjustDeclIfTemplate(RecordD); 5190 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5191 PushDeclContext(S, Record); 5192} 5193 5194void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5195 if (!RecordD) return; 5196 PopDeclContext(); 5197} 5198 5199/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5200/// parsing a top-level (non-nested) C++ class, and we are now 5201/// parsing those parts of the given Method declaration that could 5202/// not be parsed earlier (C++ [class.mem]p2), such as default 5203/// arguments. This action should enter the scope of the given 5204/// Method declaration as if we had just parsed the qualified method 5205/// name. However, it should not bring the parameters into scope; 5206/// that will be performed by ActOnDelayedCXXMethodParameter. 5207void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5208} 5209 5210/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5211/// C++ method declaration. We're (re-)introducing the given 5212/// function parameter into scope for use in parsing later parts of 5213/// the method declaration. For example, we could see an 5214/// ActOnParamDefaultArgument event for this parameter. 5215void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5216 if (!ParamD) 5217 return; 5218 5219 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5220 5221 // If this parameter has an unparsed default argument, clear it out 5222 // to make way for the parsed default argument. 5223 if (Param->hasUnparsedDefaultArg()) 5224 Param->setDefaultArg(0); 5225 5226 S->AddDecl(Param); 5227 if (Param->getDeclName()) 5228 IdResolver.AddDecl(Param); 5229} 5230 5231/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5232/// processing the delayed method declaration for Method. The method 5233/// declaration is now considered finished. There may be a separate 5234/// ActOnStartOfFunctionDef action later (not necessarily 5235/// immediately!) for this method, if it was also defined inside the 5236/// class body. 5237void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5238 if (!MethodD) 5239 return; 5240 5241 AdjustDeclIfTemplate(MethodD); 5242 5243 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5244 5245 // Now that we have our default arguments, check the constructor 5246 // again. It could produce additional diagnostics or affect whether 5247 // the class has implicitly-declared destructors, among other 5248 // things. 5249 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5250 CheckConstructor(Constructor); 5251 5252 // Check the default arguments, which we may have added. 5253 if (!Method->isInvalidDecl()) 5254 CheckCXXDefaultArguments(Method); 5255} 5256 5257/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5258/// the well-formedness of the constructor declarator @p D with type @p 5259/// R. If there are any errors in the declarator, this routine will 5260/// emit diagnostics and set the invalid bit to true. In any case, the type 5261/// will be updated to reflect a well-formed type for the constructor and 5262/// returned. 5263QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5264 StorageClass &SC) { 5265 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5266 5267 // C++ [class.ctor]p3: 5268 // A constructor shall not be virtual (10.3) or static (9.4). A 5269 // constructor can be invoked for a const, volatile or const 5270 // volatile object. A constructor shall not be declared const, 5271 // volatile, or const volatile (9.3.2). 5272 if (isVirtual) { 5273 if (!D.isInvalidType()) 5274 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5275 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5276 << SourceRange(D.getIdentifierLoc()); 5277 D.setInvalidType(); 5278 } 5279 if (SC == SC_Static) { 5280 if (!D.isInvalidType()) 5281 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5282 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5283 << SourceRange(D.getIdentifierLoc()); 5284 D.setInvalidType(); 5285 SC = SC_None; 5286 } 5287 5288 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5289 if (FTI.TypeQuals != 0) { 5290 if (FTI.TypeQuals & Qualifiers::Const) 5291 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5292 << "const" << SourceRange(D.getIdentifierLoc()); 5293 if (FTI.TypeQuals & Qualifiers::Volatile) 5294 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5295 << "volatile" << SourceRange(D.getIdentifierLoc()); 5296 if (FTI.TypeQuals & Qualifiers::Restrict) 5297 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5298 << "restrict" << SourceRange(D.getIdentifierLoc()); 5299 D.setInvalidType(); 5300 } 5301 5302 // C++0x [class.ctor]p4: 5303 // A constructor shall not be declared with a ref-qualifier. 5304 if (FTI.hasRefQualifier()) { 5305 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5306 << FTI.RefQualifierIsLValueRef 5307 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5308 D.setInvalidType(); 5309 } 5310 5311 // Rebuild the function type "R" without any type qualifiers (in 5312 // case any of the errors above fired) and with "void" as the 5313 // return type, since constructors don't have return types. 5314 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5315 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5316 return R; 5317 5318 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5319 EPI.TypeQuals = 0; 5320 EPI.RefQualifier = RQ_None; 5321 5322 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5323 Proto->getNumArgs(), EPI); 5324} 5325 5326/// CheckConstructor - Checks a fully-formed constructor for 5327/// well-formedness, issuing any diagnostics required. Returns true if 5328/// the constructor declarator is invalid. 5329void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5330 CXXRecordDecl *ClassDecl 5331 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5332 if (!ClassDecl) 5333 return Constructor->setInvalidDecl(); 5334 5335 // C++ [class.copy]p3: 5336 // A declaration of a constructor for a class X is ill-formed if 5337 // its first parameter is of type (optionally cv-qualified) X and 5338 // either there are no other parameters or else all other 5339 // parameters have default arguments. 5340 if (!Constructor->isInvalidDecl() && 5341 ((Constructor->getNumParams() == 1) || 5342 (Constructor->getNumParams() > 1 && 5343 Constructor->getParamDecl(1)->hasDefaultArg())) && 5344 Constructor->getTemplateSpecializationKind() 5345 != TSK_ImplicitInstantiation) { 5346 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5347 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5348 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5349 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5350 const char *ConstRef 5351 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5352 : " const &"; 5353 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5354 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5355 5356 // FIXME: Rather that making the constructor invalid, we should endeavor 5357 // to fix the type. 5358 Constructor->setInvalidDecl(); 5359 } 5360 } 5361} 5362 5363/// CheckDestructor - Checks a fully-formed destructor definition for 5364/// well-formedness, issuing any diagnostics required. Returns true 5365/// on error. 5366bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5367 CXXRecordDecl *RD = Destructor->getParent(); 5368 5369 if (Destructor->isVirtual()) { 5370 SourceLocation Loc; 5371 5372 if (!Destructor->isImplicit()) 5373 Loc = Destructor->getLocation(); 5374 else 5375 Loc = RD->getLocation(); 5376 5377 // If we have a virtual destructor, look up the deallocation function 5378 FunctionDecl *OperatorDelete = 0; 5379 DeclarationName Name = 5380 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5381 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5382 return true; 5383 5384 MarkDeclarationReferenced(Loc, OperatorDelete); 5385 5386 Destructor->setOperatorDelete(OperatorDelete); 5387 } 5388 5389 return false; 5390} 5391 5392static inline bool 5393FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5394 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5395 FTI.ArgInfo[0].Param && 5396 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5397} 5398 5399/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5400/// the well-formednes of the destructor declarator @p D with type @p 5401/// R. If there are any errors in the declarator, this routine will 5402/// emit diagnostics and set the declarator to invalid. Even if this happens, 5403/// will be updated to reflect a well-formed type for the destructor and 5404/// returned. 5405QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5406 StorageClass& SC) { 5407 // C++ [class.dtor]p1: 5408 // [...] A typedef-name that names a class is a class-name 5409 // (7.1.3); however, a typedef-name that names a class shall not 5410 // be used as the identifier in the declarator for a destructor 5411 // declaration. 5412 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5413 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5414 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5415 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5416 else if (const TemplateSpecializationType *TST = 5417 DeclaratorType->getAs<TemplateSpecializationType>()) 5418 if (TST->isTypeAlias()) 5419 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5420 << DeclaratorType << 1; 5421 5422 // C++ [class.dtor]p2: 5423 // A destructor is used to destroy objects of its class type. A 5424 // destructor takes no parameters, and no return type can be 5425 // specified for it (not even void). The address of a destructor 5426 // shall not be taken. A destructor shall not be static. A 5427 // destructor can be invoked for a const, volatile or const 5428 // volatile object. A destructor shall not be declared const, 5429 // volatile or const volatile (9.3.2). 5430 if (SC == SC_Static) { 5431 if (!D.isInvalidType()) 5432 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5433 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5434 << SourceRange(D.getIdentifierLoc()) 5435 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5436 5437 SC = SC_None; 5438 } 5439 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5440 // Destructors don't have return types, but the parser will 5441 // happily parse something like: 5442 // 5443 // class X { 5444 // float ~X(); 5445 // }; 5446 // 5447 // The return type will be eliminated later. 5448 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5449 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5450 << SourceRange(D.getIdentifierLoc()); 5451 } 5452 5453 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5454 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5455 if (FTI.TypeQuals & Qualifiers::Const) 5456 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5457 << "const" << SourceRange(D.getIdentifierLoc()); 5458 if (FTI.TypeQuals & Qualifiers::Volatile) 5459 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5460 << "volatile" << SourceRange(D.getIdentifierLoc()); 5461 if (FTI.TypeQuals & Qualifiers::Restrict) 5462 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5463 << "restrict" << SourceRange(D.getIdentifierLoc()); 5464 D.setInvalidType(); 5465 } 5466 5467 // C++0x [class.dtor]p2: 5468 // A destructor shall not be declared with a ref-qualifier. 5469 if (FTI.hasRefQualifier()) { 5470 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5471 << FTI.RefQualifierIsLValueRef 5472 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5473 D.setInvalidType(); 5474 } 5475 5476 // Make sure we don't have any parameters. 5477 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5478 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5479 5480 // Delete the parameters. 5481 FTI.freeArgs(); 5482 D.setInvalidType(); 5483 } 5484 5485 // Make sure the destructor isn't variadic. 5486 if (FTI.isVariadic) { 5487 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5488 D.setInvalidType(); 5489 } 5490 5491 // Rebuild the function type "R" without any type qualifiers or 5492 // parameters (in case any of the errors above fired) and with 5493 // "void" as the return type, since destructors don't have return 5494 // types. 5495 if (!D.isInvalidType()) 5496 return R; 5497 5498 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5499 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5500 EPI.Variadic = false; 5501 EPI.TypeQuals = 0; 5502 EPI.RefQualifier = RQ_None; 5503 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5504} 5505 5506/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5507/// well-formednes of the conversion function declarator @p D with 5508/// type @p R. If there are any errors in the declarator, this routine 5509/// will emit diagnostics and return true. Otherwise, it will return 5510/// false. Either way, the type @p R will be updated to reflect a 5511/// well-formed type for the conversion operator. 5512void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5513 StorageClass& SC) { 5514 // C++ [class.conv.fct]p1: 5515 // Neither parameter types nor return type can be specified. The 5516 // type of a conversion function (8.3.5) is "function taking no 5517 // parameter returning conversion-type-id." 5518 if (SC == SC_Static) { 5519 if (!D.isInvalidType()) 5520 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5521 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5522 << SourceRange(D.getIdentifierLoc()); 5523 D.setInvalidType(); 5524 SC = SC_None; 5525 } 5526 5527 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5528 5529 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5530 // Conversion functions don't have return types, but the parser will 5531 // happily parse something like: 5532 // 5533 // class X { 5534 // float operator bool(); 5535 // }; 5536 // 5537 // The return type will be changed later anyway. 5538 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5539 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5540 << SourceRange(D.getIdentifierLoc()); 5541 D.setInvalidType(); 5542 } 5543 5544 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5545 5546 // Make sure we don't have any parameters. 5547 if (Proto->getNumArgs() > 0) { 5548 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5549 5550 // Delete the parameters. 5551 D.getFunctionTypeInfo().freeArgs(); 5552 D.setInvalidType(); 5553 } else if (Proto->isVariadic()) { 5554 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5555 D.setInvalidType(); 5556 } 5557 5558 // Diagnose "&operator bool()" and other such nonsense. This 5559 // is actually a gcc extension which we don't support. 5560 if (Proto->getResultType() != ConvType) { 5561 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5562 << Proto->getResultType(); 5563 D.setInvalidType(); 5564 ConvType = Proto->getResultType(); 5565 } 5566 5567 // C++ [class.conv.fct]p4: 5568 // The conversion-type-id shall not represent a function type nor 5569 // an array type. 5570 if (ConvType->isArrayType()) { 5571 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5572 ConvType = Context.getPointerType(ConvType); 5573 D.setInvalidType(); 5574 } else if (ConvType->isFunctionType()) { 5575 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5576 ConvType = Context.getPointerType(ConvType); 5577 D.setInvalidType(); 5578 } 5579 5580 // Rebuild the function type "R" without any parameters (in case any 5581 // of the errors above fired) and with the conversion type as the 5582 // return type. 5583 if (D.isInvalidType()) 5584 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5585 5586 // C++0x explicit conversion operators. 5587 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5588 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5589 diag::warn_explicit_conversion_functions) 5590 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5591} 5592 5593/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5594/// the declaration of the given C++ conversion function. This routine 5595/// is responsible for recording the conversion function in the C++ 5596/// class, if possible. 5597Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5598 assert(Conversion && "Expected to receive a conversion function declaration"); 5599 5600 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5601 5602 // Make sure we aren't redeclaring the conversion function. 5603 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5604 5605 // C++ [class.conv.fct]p1: 5606 // [...] A conversion function is never used to convert a 5607 // (possibly cv-qualified) object to the (possibly cv-qualified) 5608 // same object type (or a reference to it), to a (possibly 5609 // cv-qualified) base class of that type (or a reference to it), 5610 // or to (possibly cv-qualified) void. 5611 // FIXME: Suppress this warning if the conversion function ends up being a 5612 // virtual function that overrides a virtual function in a base class. 5613 QualType ClassType 5614 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5615 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5616 ConvType = ConvTypeRef->getPointeeType(); 5617 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5618 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5619 /* Suppress diagnostics for instantiations. */; 5620 else if (ConvType->isRecordType()) { 5621 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5622 if (ConvType == ClassType) 5623 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5624 << ClassType; 5625 else if (IsDerivedFrom(ClassType, ConvType)) 5626 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5627 << ClassType << ConvType; 5628 } else if (ConvType->isVoidType()) { 5629 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5630 << ClassType << ConvType; 5631 } 5632 5633 if (FunctionTemplateDecl *ConversionTemplate 5634 = Conversion->getDescribedFunctionTemplate()) 5635 return ConversionTemplate; 5636 5637 return Conversion; 5638} 5639 5640//===----------------------------------------------------------------------===// 5641// Namespace Handling 5642//===----------------------------------------------------------------------===// 5643 5644 5645 5646/// ActOnStartNamespaceDef - This is called at the start of a namespace 5647/// definition. 5648Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5649 SourceLocation InlineLoc, 5650 SourceLocation NamespaceLoc, 5651 SourceLocation IdentLoc, 5652 IdentifierInfo *II, 5653 SourceLocation LBrace, 5654 AttributeList *AttrList) { 5655 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5656 // For anonymous namespace, take the location of the left brace. 5657 SourceLocation Loc = II ? IdentLoc : LBrace; 5658 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5659 StartLoc, Loc, II); 5660 Namespc->setInline(InlineLoc.isValid()); 5661 5662 Scope *DeclRegionScope = NamespcScope->getParent(); 5663 5664 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5665 5666 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5667 PushNamespaceVisibilityAttr(Attr); 5668 5669 if (II) { 5670 // C++ [namespace.def]p2: 5671 // The identifier in an original-namespace-definition shall not 5672 // have been previously defined in the declarative region in 5673 // which the original-namespace-definition appears. The 5674 // identifier in an original-namespace-definition is the name of 5675 // the namespace. Subsequently in that declarative region, it is 5676 // treated as an original-namespace-name. 5677 // 5678 // Since namespace names are unique in their scope, and we don't 5679 // look through using directives, just look for any ordinary names. 5680 5681 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5682 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5683 Decl::IDNS_Namespace; 5684 NamedDecl *PrevDecl = 0; 5685 for (DeclContext::lookup_result R 5686 = CurContext->getRedeclContext()->lookup(II); 5687 R.first != R.second; ++R.first) { 5688 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5689 PrevDecl = *R.first; 5690 break; 5691 } 5692 } 5693 5694 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5695 // This is an extended namespace definition. 5696 if (Namespc->isInline() != OrigNS->isInline()) { 5697 // inline-ness must match 5698 if (OrigNS->isInline()) { 5699 // The user probably just forgot the 'inline', so suggest that it 5700 // be added back. 5701 Diag(Namespc->getLocation(), 5702 diag::warn_inline_namespace_reopened_noninline) 5703 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5704 } else { 5705 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5706 << Namespc->isInline(); 5707 } 5708 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5709 5710 // Recover by ignoring the new namespace's inline status. 5711 Namespc->setInline(OrigNS->isInline()); 5712 } 5713 5714 // Attach this namespace decl to the chain of extended namespace 5715 // definitions. 5716 OrigNS->setNextNamespace(Namespc); 5717 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5718 5719 // Remove the previous declaration from the scope. 5720 if (DeclRegionScope->isDeclScope(OrigNS)) { 5721 IdResolver.RemoveDecl(OrigNS); 5722 DeclRegionScope->RemoveDecl(OrigNS); 5723 } 5724 } else if (PrevDecl) { 5725 // This is an invalid name redefinition. 5726 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5727 << Namespc->getDeclName(); 5728 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5729 Namespc->setInvalidDecl(); 5730 // Continue on to push Namespc as current DeclContext and return it. 5731 } else if (II->isStr("std") && 5732 CurContext->getRedeclContext()->isTranslationUnit()) { 5733 // This is the first "real" definition of the namespace "std", so update 5734 // our cache of the "std" namespace to point at this definition. 5735 if (NamespaceDecl *StdNS = getStdNamespace()) { 5736 // We had already defined a dummy namespace "std". Link this new 5737 // namespace definition to the dummy namespace "std". 5738 StdNS->setNextNamespace(Namespc); 5739 StdNS->setLocation(IdentLoc); 5740 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5741 } 5742 5743 // Make our StdNamespace cache point at the first real definition of the 5744 // "std" namespace. 5745 StdNamespace = Namespc; 5746 5747 // Add this instance of "std" to the set of known namespaces 5748 KnownNamespaces[Namespc] = false; 5749 } else if (!Namespc->isInline()) { 5750 // Since this is an "original" namespace, add it to the known set of 5751 // namespaces if it is not an inline namespace. 5752 KnownNamespaces[Namespc] = false; 5753 } 5754 5755 PushOnScopeChains(Namespc, DeclRegionScope); 5756 } else { 5757 // Anonymous namespaces. 5758 assert(Namespc->isAnonymousNamespace()); 5759 5760 // Link the anonymous namespace into its parent. 5761 NamespaceDecl *PrevDecl; 5762 DeclContext *Parent = CurContext->getRedeclContext(); 5763 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5764 PrevDecl = TU->getAnonymousNamespace(); 5765 TU->setAnonymousNamespace(Namespc); 5766 } else { 5767 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5768 PrevDecl = ND->getAnonymousNamespace(); 5769 ND->setAnonymousNamespace(Namespc); 5770 } 5771 5772 // Link the anonymous namespace with its previous declaration. 5773 if (PrevDecl) { 5774 assert(PrevDecl->isAnonymousNamespace()); 5775 assert(!PrevDecl->getNextNamespace()); 5776 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5777 PrevDecl->setNextNamespace(Namespc); 5778 5779 if (Namespc->isInline() != PrevDecl->isInline()) { 5780 // inline-ness must match 5781 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5782 << Namespc->isInline(); 5783 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5784 Namespc->setInvalidDecl(); 5785 // Recover by ignoring the new namespace's inline status. 5786 Namespc->setInline(PrevDecl->isInline()); 5787 } 5788 } 5789 5790 CurContext->addDecl(Namespc); 5791 5792 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5793 // behaves as if it were replaced by 5794 // namespace unique { /* empty body */ } 5795 // using namespace unique; 5796 // namespace unique { namespace-body } 5797 // where all occurrences of 'unique' in a translation unit are 5798 // replaced by the same identifier and this identifier differs 5799 // from all other identifiers in the entire program. 5800 5801 // We just create the namespace with an empty name and then add an 5802 // implicit using declaration, just like the standard suggests. 5803 // 5804 // CodeGen enforces the "universally unique" aspect by giving all 5805 // declarations semantically contained within an anonymous 5806 // namespace internal linkage. 5807 5808 if (!PrevDecl) { 5809 UsingDirectiveDecl* UD 5810 = UsingDirectiveDecl::Create(Context, CurContext, 5811 /* 'using' */ LBrace, 5812 /* 'namespace' */ SourceLocation(), 5813 /* qualifier */ NestedNameSpecifierLoc(), 5814 /* identifier */ SourceLocation(), 5815 Namespc, 5816 /* Ancestor */ CurContext); 5817 UD->setImplicit(); 5818 CurContext->addDecl(UD); 5819 } 5820 } 5821 5822 // Although we could have an invalid decl (i.e. the namespace name is a 5823 // redefinition), push it as current DeclContext and try to continue parsing. 5824 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5825 // for the namespace has the declarations that showed up in that particular 5826 // namespace definition. 5827 PushDeclContext(NamespcScope, Namespc); 5828 return Namespc; 5829} 5830 5831/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5832/// is a namespace alias, returns the namespace it points to. 5833static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5834 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5835 return AD->getNamespace(); 5836 return dyn_cast_or_null<NamespaceDecl>(D); 5837} 5838 5839/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5840/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5841void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5842 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5843 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5844 Namespc->setRBraceLoc(RBrace); 5845 PopDeclContext(); 5846 if (Namespc->hasAttr<VisibilityAttr>()) 5847 PopPragmaVisibility(); 5848} 5849 5850CXXRecordDecl *Sema::getStdBadAlloc() const { 5851 return cast_or_null<CXXRecordDecl>( 5852 StdBadAlloc.get(Context.getExternalSource())); 5853} 5854 5855NamespaceDecl *Sema::getStdNamespace() const { 5856 return cast_or_null<NamespaceDecl>( 5857 StdNamespace.get(Context.getExternalSource())); 5858} 5859 5860/// \brief Retrieve the special "std" namespace, which may require us to 5861/// implicitly define the namespace. 5862NamespaceDecl *Sema::getOrCreateStdNamespace() { 5863 if (!StdNamespace) { 5864 // The "std" namespace has not yet been defined, so build one implicitly. 5865 StdNamespace = NamespaceDecl::Create(Context, 5866 Context.getTranslationUnitDecl(), 5867 SourceLocation(), SourceLocation(), 5868 &PP.getIdentifierTable().get("std")); 5869 getStdNamespace()->setImplicit(true); 5870 } 5871 5872 return getStdNamespace(); 5873} 5874 5875/// \brief Determine whether a using statement is in a context where it will be 5876/// apply in all contexts. 5877static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5878 switch (CurContext->getDeclKind()) { 5879 case Decl::TranslationUnit: 5880 return true; 5881 case Decl::LinkageSpec: 5882 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5883 default: 5884 return false; 5885 } 5886} 5887 5888static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5889 CXXScopeSpec &SS, 5890 SourceLocation IdentLoc, 5891 IdentifierInfo *Ident) { 5892 R.clear(); 5893 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5894 R.getLookupKind(), Sc, &SS, NULL, 5895 false, S.CTC_NoKeywords, NULL)) { 5896 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5897 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5898 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5899 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5900 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5901 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5902 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5903 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5904 else 5905 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5906 << Ident << CorrectedQuotedStr 5907 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5908 5909 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5910 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5911 5912 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5913 R.addDecl(Corrected.getCorrectionDecl()); 5914 return true; 5915 } 5916 R.setLookupName(Ident); 5917 } 5918 return false; 5919} 5920 5921Decl *Sema::ActOnUsingDirective(Scope *S, 5922 SourceLocation UsingLoc, 5923 SourceLocation NamespcLoc, 5924 CXXScopeSpec &SS, 5925 SourceLocation IdentLoc, 5926 IdentifierInfo *NamespcName, 5927 AttributeList *AttrList) { 5928 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5929 assert(NamespcName && "Invalid NamespcName."); 5930 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5931 5932 // This can only happen along a recovery path. 5933 while (S->getFlags() & Scope::TemplateParamScope) 5934 S = S->getParent(); 5935 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5936 5937 UsingDirectiveDecl *UDir = 0; 5938 NestedNameSpecifier *Qualifier = 0; 5939 if (SS.isSet()) 5940 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5941 5942 // Lookup namespace name. 5943 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5944 LookupParsedName(R, S, &SS); 5945 if (R.isAmbiguous()) 5946 return 0; 5947 5948 if (R.empty()) { 5949 R.clear(); 5950 // Allow "using namespace std;" or "using namespace ::std;" even if 5951 // "std" hasn't been defined yet, for GCC compatibility. 5952 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5953 NamespcName->isStr("std")) { 5954 Diag(IdentLoc, diag::ext_using_undefined_std); 5955 R.addDecl(getOrCreateStdNamespace()); 5956 R.resolveKind(); 5957 } 5958 // Otherwise, attempt typo correction. 5959 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5960 } 5961 5962 if (!R.empty()) { 5963 NamedDecl *Named = R.getFoundDecl(); 5964 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5965 && "expected namespace decl"); 5966 // C++ [namespace.udir]p1: 5967 // A using-directive specifies that the names in the nominated 5968 // namespace can be used in the scope in which the 5969 // using-directive appears after the using-directive. During 5970 // unqualified name lookup (3.4.1), the names appear as if they 5971 // were declared in the nearest enclosing namespace which 5972 // contains both the using-directive and the nominated 5973 // namespace. [Note: in this context, "contains" means "contains 5974 // directly or indirectly". ] 5975 5976 // Find enclosing context containing both using-directive and 5977 // nominated namespace. 5978 NamespaceDecl *NS = getNamespaceDecl(Named); 5979 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5980 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5981 CommonAncestor = CommonAncestor->getParent(); 5982 5983 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5984 SS.getWithLocInContext(Context), 5985 IdentLoc, Named, CommonAncestor); 5986 5987 if (IsUsingDirectiveInToplevelContext(CurContext) && 5988 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5989 Diag(IdentLoc, diag::warn_using_directive_in_header); 5990 } 5991 5992 PushUsingDirective(S, UDir); 5993 } else { 5994 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5995 } 5996 5997 // FIXME: We ignore attributes for now. 5998 return UDir; 5999} 6000 6001void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6002 // If scope has associated entity, then using directive is at namespace 6003 // or translation unit scope. We add UsingDirectiveDecls, into 6004 // it's lookup structure. 6005 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6006 Ctx->addDecl(UDir); 6007 else 6008 // Otherwise it is block-sope. using-directives will affect lookup 6009 // only to the end of scope. 6010 S->PushUsingDirective(UDir); 6011} 6012 6013 6014Decl *Sema::ActOnUsingDeclaration(Scope *S, 6015 AccessSpecifier AS, 6016 bool HasUsingKeyword, 6017 SourceLocation UsingLoc, 6018 CXXScopeSpec &SS, 6019 UnqualifiedId &Name, 6020 AttributeList *AttrList, 6021 bool IsTypeName, 6022 SourceLocation TypenameLoc) { 6023 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6024 6025 switch (Name.getKind()) { 6026 case UnqualifiedId::IK_ImplicitSelfParam: 6027 case UnqualifiedId::IK_Identifier: 6028 case UnqualifiedId::IK_OperatorFunctionId: 6029 case UnqualifiedId::IK_LiteralOperatorId: 6030 case UnqualifiedId::IK_ConversionFunctionId: 6031 break; 6032 6033 case UnqualifiedId::IK_ConstructorName: 6034 case UnqualifiedId::IK_ConstructorTemplateId: 6035 // C++0x inherited constructors. 6036 if (getLangOptions().CPlusPlus0x) break; 6037 6038 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 6039 << SS.getRange(); 6040 return 0; 6041 6042 case UnqualifiedId::IK_DestructorName: 6043 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6044 << SS.getRange(); 6045 return 0; 6046 6047 case UnqualifiedId::IK_TemplateId: 6048 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6049 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6050 return 0; 6051 } 6052 6053 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6054 DeclarationName TargetName = TargetNameInfo.getName(); 6055 if (!TargetName) 6056 return 0; 6057 6058 // Warn about using declarations. 6059 // TODO: store that the declaration was written without 'using' and 6060 // talk about access decls instead of using decls in the 6061 // diagnostics. 6062 if (!HasUsingKeyword) { 6063 UsingLoc = Name.getSourceRange().getBegin(); 6064 6065 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6066 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6067 } 6068 6069 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6070 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6071 return 0; 6072 6073 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6074 TargetNameInfo, AttrList, 6075 /* IsInstantiation */ false, 6076 IsTypeName, TypenameLoc); 6077 if (UD) 6078 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6079 6080 return UD; 6081} 6082 6083/// \brief Determine whether a using declaration considers the given 6084/// declarations as "equivalent", e.g., if they are redeclarations of 6085/// the same entity or are both typedefs of the same type. 6086static bool 6087IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6088 bool &SuppressRedeclaration) { 6089 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6090 SuppressRedeclaration = false; 6091 return true; 6092 } 6093 6094 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6095 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6096 SuppressRedeclaration = true; 6097 return Context.hasSameType(TD1->getUnderlyingType(), 6098 TD2->getUnderlyingType()); 6099 } 6100 6101 return false; 6102} 6103 6104 6105/// Determines whether to create a using shadow decl for a particular 6106/// decl, given the set of decls existing prior to this using lookup. 6107bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6108 const LookupResult &Previous) { 6109 // Diagnose finding a decl which is not from a base class of the 6110 // current class. We do this now because there are cases where this 6111 // function will silently decide not to build a shadow decl, which 6112 // will pre-empt further diagnostics. 6113 // 6114 // We don't need to do this in C++0x because we do the check once on 6115 // the qualifier. 6116 // 6117 // FIXME: diagnose the following if we care enough: 6118 // struct A { int foo; }; 6119 // struct B : A { using A::foo; }; 6120 // template <class T> struct C : A {}; 6121 // template <class T> struct D : C<T> { using B::foo; } // <--- 6122 // This is invalid (during instantiation) in C++03 because B::foo 6123 // resolves to the using decl in B, which is not a base class of D<T>. 6124 // We can't diagnose it immediately because C<T> is an unknown 6125 // specialization. The UsingShadowDecl in D<T> then points directly 6126 // to A::foo, which will look well-formed when we instantiate. 6127 // The right solution is to not collapse the shadow-decl chain. 6128 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6129 DeclContext *OrigDC = Orig->getDeclContext(); 6130 6131 // Handle enums and anonymous structs. 6132 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6133 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6134 while (OrigRec->isAnonymousStructOrUnion()) 6135 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6136 6137 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6138 if (OrigDC == CurContext) { 6139 Diag(Using->getLocation(), 6140 diag::err_using_decl_nested_name_specifier_is_current_class) 6141 << Using->getQualifierLoc().getSourceRange(); 6142 Diag(Orig->getLocation(), diag::note_using_decl_target); 6143 return true; 6144 } 6145 6146 Diag(Using->getQualifierLoc().getBeginLoc(), 6147 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6148 << Using->getQualifier() 6149 << cast<CXXRecordDecl>(CurContext) 6150 << Using->getQualifierLoc().getSourceRange(); 6151 Diag(Orig->getLocation(), diag::note_using_decl_target); 6152 return true; 6153 } 6154 } 6155 6156 if (Previous.empty()) return false; 6157 6158 NamedDecl *Target = Orig; 6159 if (isa<UsingShadowDecl>(Target)) 6160 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6161 6162 // If the target happens to be one of the previous declarations, we 6163 // don't have a conflict. 6164 // 6165 // FIXME: but we might be increasing its access, in which case we 6166 // should redeclare it. 6167 NamedDecl *NonTag = 0, *Tag = 0; 6168 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6169 I != E; ++I) { 6170 NamedDecl *D = (*I)->getUnderlyingDecl(); 6171 bool Result; 6172 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6173 return Result; 6174 6175 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6176 } 6177 6178 if (Target->isFunctionOrFunctionTemplate()) { 6179 FunctionDecl *FD; 6180 if (isa<FunctionTemplateDecl>(Target)) 6181 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6182 else 6183 FD = cast<FunctionDecl>(Target); 6184 6185 NamedDecl *OldDecl = 0; 6186 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6187 case Ovl_Overload: 6188 return false; 6189 6190 case Ovl_NonFunction: 6191 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6192 break; 6193 6194 // We found a decl with the exact signature. 6195 case Ovl_Match: 6196 // If we're in a record, we want to hide the target, so we 6197 // return true (without a diagnostic) to tell the caller not to 6198 // build a shadow decl. 6199 if (CurContext->isRecord()) 6200 return true; 6201 6202 // If we're not in a record, this is an error. 6203 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6204 break; 6205 } 6206 6207 Diag(Target->getLocation(), diag::note_using_decl_target); 6208 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6209 return true; 6210 } 6211 6212 // Target is not a function. 6213 6214 if (isa<TagDecl>(Target)) { 6215 // No conflict between a tag and a non-tag. 6216 if (!Tag) return false; 6217 6218 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6219 Diag(Target->getLocation(), diag::note_using_decl_target); 6220 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6221 return true; 6222 } 6223 6224 // No conflict between a tag and a non-tag. 6225 if (!NonTag) return false; 6226 6227 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6228 Diag(Target->getLocation(), diag::note_using_decl_target); 6229 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6230 return true; 6231} 6232 6233/// Builds a shadow declaration corresponding to a 'using' declaration. 6234UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6235 UsingDecl *UD, 6236 NamedDecl *Orig) { 6237 6238 // If we resolved to another shadow declaration, just coalesce them. 6239 NamedDecl *Target = Orig; 6240 if (isa<UsingShadowDecl>(Target)) { 6241 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6242 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6243 } 6244 6245 UsingShadowDecl *Shadow 6246 = UsingShadowDecl::Create(Context, CurContext, 6247 UD->getLocation(), UD, Target); 6248 UD->addShadowDecl(Shadow); 6249 6250 Shadow->setAccess(UD->getAccess()); 6251 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6252 Shadow->setInvalidDecl(); 6253 6254 if (S) 6255 PushOnScopeChains(Shadow, S); 6256 else 6257 CurContext->addDecl(Shadow); 6258 6259 6260 return Shadow; 6261} 6262 6263/// Hides a using shadow declaration. This is required by the current 6264/// using-decl implementation when a resolvable using declaration in a 6265/// class is followed by a declaration which would hide or override 6266/// one or more of the using decl's targets; for example: 6267/// 6268/// struct Base { void foo(int); }; 6269/// struct Derived : Base { 6270/// using Base::foo; 6271/// void foo(int); 6272/// }; 6273/// 6274/// The governing language is C++03 [namespace.udecl]p12: 6275/// 6276/// When a using-declaration brings names from a base class into a 6277/// derived class scope, member functions in the derived class 6278/// override and/or hide member functions with the same name and 6279/// parameter types in a base class (rather than conflicting). 6280/// 6281/// There are two ways to implement this: 6282/// (1) optimistically create shadow decls when they're not hidden 6283/// by existing declarations, or 6284/// (2) don't create any shadow decls (or at least don't make them 6285/// visible) until we've fully parsed/instantiated the class. 6286/// The problem with (1) is that we might have to retroactively remove 6287/// a shadow decl, which requires several O(n) operations because the 6288/// decl structures are (very reasonably) not designed for removal. 6289/// (2) avoids this but is very fiddly and phase-dependent. 6290void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6291 if (Shadow->getDeclName().getNameKind() == 6292 DeclarationName::CXXConversionFunctionName) 6293 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6294 6295 // Remove it from the DeclContext... 6296 Shadow->getDeclContext()->removeDecl(Shadow); 6297 6298 // ...and the scope, if applicable... 6299 if (S) { 6300 S->RemoveDecl(Shadow); 6301 IdResolver.RemoveDecl(Shadow); 6302 } 6303 6304 // ...and the using decl. 6305 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6306 6307 // TODO: complain somehow if Shadow was used. It shouldn't 6308 // be possible for this to happen, because...? 6309} 6310 6311/// Builds a using declaration. 6312/// 6313/// \param IsInstantiation - Whether this call arises from an 6314/// instantiation of an unresolved using declaration. We treat 6315/// the lookup differently for these declarations. 6316NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6317 SourceLocation UsingLoc, 6318 CXXScopeSpec &SS, 6319 const DeclarationNameInfo &NameInfo, 6320 AttributeList *AttrList, 6321 bool IsInstantiation, 6322 bool IsTypeName, 6323 SourceLocation TypenameLoc) { 6324 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6325 SourceLocation IdentLoc = NameInfo.getLoc(); 6326 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6327 6328 // FIXME: We ignore attributes for now. 6329 6330 if (SS.isEmpty()) { 6331 Diag(IdentLoc, diag::err_using_requires_qualname); 6332 return 0; 6333 } 6334 6335 // Do the redeclaration lookup in the current scope. 6336 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6337 ForRedeclaration); 6338 Previous.setHideTags(false); 6339 if (S) { 6340 LookupName(Previous, S); 6341 6342 // It is really dumb that we have to do this. 6343 LookupResult::Filter F = Previous.makeFilter(); 6344 while (F.hasNext()) { 6345 NamedDecl *D = F.next(); 6346 if (!isDeclInScope(D, CurContext, S)) 6347 F.erase(); 6348 } 6349 F.done(); 6350 } else { 6351 assert(IsInstantiation && "no scope in non-instantiation"); 6352 assert(CurContext->isRecord() && "scope not record in instantiation"); 6353 LookupQualifiedName(Previous, CurContext); 6354 } 6355 6356 // Check for invalid redeclarations. 6357 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6358 return 0; 6359 6360 // Check for bad qualifiers. 6361 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6362 return 0; 6363 6364 DeclContext *LookupContext = computeDeclContext(SS); 6365 NamedDecl *D; 6366 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6367 if (!LookupContext) { 6368 if (IsTypeName) { 6369 // FIXME: not all declaration name kinds are legal here 6370 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6371 UsingLoc, TypenameLoc, 6372 QualifierLoc, 6373 IdentLoc, NameInfo.getName()); 6374 } else { 6375 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6376 QualifierLoc, NameInfo); 6377 } 6378 } else { 6379 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6380 NameInfo, IsTypeName); 6381 } 6382 D->setAccess(AS); 6383 CurContext->addDecl(D); 6384 6385 if (!LookupContext) return D; 6386 UsingDecl *UD = cast<UsingDecl>(D); 6387 6388 if (RequireCompleteDeclContext(SS, LookupContext)) { 6389 UD->setInvalidDecl(); 6390 return UD; 6391 } 6392 6393 // Constructor inheriting using decls get special treatment. 6394 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6395 if (CheckInheritedConstructorUsingDecl(UD)) 6396 UD->setInvalidDecl(); 6397 return UD; 6398 } 6399 6400 // Otherwise, look up the target name. 6401 6402 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6403 6404 // Unlike most lookups, we don't always want to hide tag 6405 // declarations: tag names are visible through the using declaration 6406 // even if hidden by ordinary names, *except* in a dependent context 6407 // where it's important for the sanity of two-phase lookup. 6408 if (!IsInstantiation) 6409 R.setHideTags(false); 6410 6411 LookupQualifiedName(R, LookupContext); 6412 6413 if (R.empty()) { 6414 Diag(IdentLoc, diag::err_no_member) 6415 << NameInfo.getName() << LookupContext << SS.getRange(); 6416 UD->setInvalidDecl(); 6417 return UD; 6418 } 6419 6420 if (R.isAmbiguous()) { 6421 UD->setInvalidDecl(); 6422 return UD; 6423 } 6424 6425 if (IsTypeName) { 6426 // If we asked for a typename and got a non-type decl, error out. 6427 if (!R.getAsSingle<TypeDecl>()) { 6428 Diag(IdentLoc, diag::err_using_typename_non_type); 6429 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6430 Diag((*I)->getUnderlyingDecl()->getLocation(), 6431 diag::note_using_decl_target); 6432 UD->setInvalidDecl(); 6433 return UD; 6434 } 6435 } else { 6436 // If we asked for a non-typename and we got a type, error out, 6437 // but only if this is an instantiation of an unresolved using 6438 // decl. Otherwise just silently find the type name. 6439 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6440 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6441 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6442 UD->setInvalidDecl(); 6443 return UD; 6444 } 6445 } 6446 6447 // C++0x N2914 [namespace.udecl]p6: 6448 // A using-declaration shall not name a namespace. 6449 if (R.getAsSingle<NamespaceDecl>()) { 6450 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6451 << SS.getRange(); 6452 UD->setInvalidDecl(); 6453 return UD; 6454 } 6455 6456 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6457 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6458 BuildUsingShadowDecl(S, UD, *I); 6459 } 6460 6461 return UD; 6462} 6463 6464/// Additional checks for a using declaration referring to a constructor name. 6465bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6466 if (UD->isTypeName()) { 6467 // FIXME: Cannot specify typename when specifying constructor 6468 return true; 6469 } 6470 6471 const Type *SourceType = UD->getQualifier()->getAsType(); 6472 assert(SourceType && 6473 "Using decl naming constructor doesn't have type in scope spec."); 6474 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6475 6476 // Check whether the named type is a direct base class. 6477 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6478 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6479 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6480 BaseIt != BaseE; ++BaseIt) { 6481 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6482 if (CanonicalSourceType == BaseType) 6483 break; 6484 } 6485 6486 if (BaseIt == BaseE) { 6487 // Did not find SourceType in the bases. 6488 Diag(UD->getUsingLocation(), 6489 diag::err_using_decl_constructor_not_in_direct_base) 6490 << UD->getNameInfo().getSourceRange() 6491 << QualType(SourceType, 0) << TargetClass; 6492 return true; 6493 } 6494 6495 BaseIt->setInheritConstructors(); 6496 6497 return false; 6498} 6499 6500/// Checks that the given using declaration is not an invalid 6501/// redeclaration. Note that this is checking only for the using decl 6502/// itself, not for any ill-formedness among the UsingShadowDecls. 6503bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6504 bool isTypeName, 6505 const CXXScopeSpec &SS, 6506 SourceLocation NameLoc, 6507 const LookupResult &Prev) { 6508 // C++03 [namespace.udecl]p8: 6509 // C++0x [namespace.udecl]p10: 6510 // A using-declaration is a declaration and can therefore be used 6511 // repeatedly where (and only where) multiple declarations are 6512 // allowed. 6513 // 6514 // That's in non-member contexts. 6515 if (!CurContext->getRedeclContext()->isRecord()) 6516 return false; 6517 6518 NestedNameSpecifier *Qual 6519 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6520 6521 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6522 NamedDecl *D = *I; 6523 6524 bool DTypename; 6525 NestedNameSpecifier *DQual; 6526 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6527 DTypename = UD->isTypeName(); 6528 DQual = UD->getQualifier(); 6529 } else if (UnresolvedUsingValueDecl *UD 6530 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6531 DTypename = false; 6532 DQual = UD->getQualifier(); 6533 } else if (UnresolvedUsingTypenameDecl *UD 6534 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6535 DTypename = true; 6536 DQual = UD->getQualifier(); 6537 } else continue; 6538 6539 // using decls differ if one says 'typename' and the other doesn't. 6540 // FIXME: non-dependent using decls? 6541 if (isTypeName != DTypename) continue; 6542 6543 // using decls differ if they name different scopes (but note that 6544 // template instantiation can cause this check to trigger when it 6545 // didn't before instantiation). 6546 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6547 Context.getCanonicalNestedNameSpecifier(DQual)) 6548 continue; 6549 6550 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6551 Diag(D->getLocation(), diag::note_using_decl) << 1; 6552 return true; 6553 } 6554 6555 return false; 6556} 6557 6558 6559/// Checks that the given nested-name qualifier used in a using decl 6560/// in the current context is appropriately related to the current 6561/// scope. If an error is found, diagnoses it and returns true. 6562bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6563 const CXXScopeSpec &SS, 6564 SourceLocation NameLoc) { 6565 DeclContext *NamedContext = computeDeclContext(SS); 6566 6567 if (!CurContext->isRecord()) { 6568 // C++03 [namespace.udecl]p3: 6569 // C++0x [namespace.udecl]p8: 6570 // A using-declaration for a class member shall be a member-declaration. 6571 6572 // If we weren't able to compute a valid scope, it must be a 6573 // dependent class scope. 6574 if (!NamedContext || NamedContext->isRecord()) { 6575 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6576 << SS.getRange(); 6577 return true; 6578 } 6579 6580 // Otherwise, everything is known to be fine. 6581 return false; 6582 } 6583 6584 // The current scope is a record. 6585 6586 // If the named context is dependent, we can't decide much. 6587 if (!NamedContext) { 6588 // FIXME: in C++0x, we can diagnose if we can prove that the 6589 // nested-name-specifier does not refer to a base class, which is 6590 // still possible in some cases. 6591 6592 // Otherwise we have to conservatively report that things might be 6593 // okay. 6594 return false; 6595 } 6596 6597 if (!NamedContext->isRecord()) { 6598 // Ideally this would point at the last name in the specifier, 6599 // but we don't have that level of source info. 6600 Diag(SS.getRange().getBegin(), 6601 diag::err_using_decl_nested_name_specifier_is_not_class) 6602 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6603 return true; 6604 } 6605 6606 if (!NamedContext->isDependentContext() && 6607 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6608 return true; 6609 6610 if (getLangOptions().CPlusPlus0x) { 6611 // C++0x [namespace.udecl]p3: 6612 // In a using-declaration used as a member-declaration, the 6613 // nested-name-specifier shall name a base class of the class 6614 // being defined. 6615 6616 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6617 cast<CXXRecordDecl>(NamedContext))) { 6618 if (CurContext == NamedContext) { 6619 Diag(NameLoc, 6620 diag::err_using_decl_nested_name_specifier_is_current_class) 6621 << SS.getRange(); 6622 return true; 6623 } 6624 6625 Diag(SS.getRange().getBegin(), 6626 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6627 << (NestedNameSpecifier*) SS.getScopeRep() 6628 << cast<CXXRecordDecl>(CurContext) 6629 << SS.getRange(); 6630 return true; 6631 } 6632 6633 return false; 6634 } 6635 6636 // C++03 [namespace.udecl]p4: 6637 // A using-declaration used as a member-declaration shall refer 6638 // to a member of a base class of the class being defined [etc.]. 6639 6640 // Salient point: SS doesn't have to name a base class as long as 6641 // lookup only finds members from base classes. Therefore we can 6642 // diagnose here only if we can prove that that can't happen, 6643 // i.e. if the class hierarchies provably don't intersect. 6644 6645 // TODO: it would be nice if "definitely valid" results were cached 6646 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6647 // need to be repeated. 6648 6649 struct UserData { 6650 llvm::DenseSet<const CXXRecordDecl*> Bases; 6651 6652 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6653 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6654 Data->Bases.insert(Base); 6655 return true; 6656 } 6657 6658 bool hasDependentBases(const CXXRecordDecl *Class) { 6659 return !Class->forallBases(collect, this); 6660 } 6661 6662 /// Returns true if the base is dependent or is one of the 6663 /// accumulated base classes. 6664 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6665 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6666 return !Data->Bases.count(Base); 6667 } 6668 6669 bool mightShareBases(const CXXRecordDecl *Class) { 6670 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6671 } 6672 }; 6673 6674 UserData Data; 6675 6676 // Returns false if we find a dependent base. 6677 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6678 return false; 6679 6680 // Returns false if the class has a dependent base or if it or one 6681 // of its bases is present in the base set of the current context. 6682 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6683 return false; 6684 6685 Diag(SS.getRange().getBegin(), 6686 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6687 << (NestedNameSpecifier*) SS.getScopeRep() 6688 << cast<CXXRecordDecl>(CurContext) 6689 << SS.getRange(); 6690 6691 return true; 6692} 6693 6694Decl *Sema::ActOnAliasDeclaration(Scope *S, 6695 AccessSpecifier AS, 6696 MultiTemplateParamsArg TemplateParamLists, 6697 SourceLocation UsingLoc, 6698 UnqualifiedId &Name, 6699 TypeResult Type) { 6700 // Skip up to the relevant declaration scope. 6701 while (S->getFlags() & Scope::TemplateParamScope) 6702 S = S->getParent(); 6703 assert((S->getFlags() & Scope::DeclScope) && 6704 "got alias-declaration outside of declaration scope"); 6705 6706 if (Type.isInvalid()) 6707 return 0; 6708 6709 bool Invalid = false; 6710 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6711 TypeSourceInfo *TInfo = 0; 6712 GetTypeFromParser(Type.get(), &TInfo); 6713 6714 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6715 return 0; 6716 6717 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6718 UPPC_DeclarationType)) { 6719 Invalid = true; 6720 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6721 TInfo->getTypeLoc().getBeginLoc()); 6722 } 6723 6724 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6725 LookupName(Previous, S); 6726 6727 // Warn about shadowing the name of a template parameter. 6728 if (Previous.isSingleResult() && 6729 Previous.getFoundDecl()->isTemplateParameter()) { 6730 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6731 Previous.getFoundDecl())) 6732 Invalid = true; 6733 Previous.clear(); 6734 } 6735 6736 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6737 "name in alias declaration must be an identifier"); 6738 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6739 Name.StartLocation, 6740 Name.Identifier, TInfo); 6741 6742 NewTD->setAccess(AS); 6743 6744 if (Invalid) 6745 NewTD->setInvalidDecl(); 6746 6747 CheckTypedefForVariablyModifiedType(S, NewTD); 6748 Invalid |= NewTD->isInvalidDecl(); 6749 6750 bool Redeclaration = false; 6751 6752 NamedDecl *NewND; 6753 if (TemplateParamLists.size()) { 6754 TypeAliasTemplateDecl *OldDecl = 0; 6755 TemplateParameterList *OldTemplateParams = 0; 6756 6757 if (TemplateParamLists.size() != 1) { 6758 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6759 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6760 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6761 } 6762 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6763 6764 // Only consider previous declarations in the same scope. 6765 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6766 /*ExplicitInstantiationOrSpecialization*/false); 6767 if (!Previous.empty()) { 6768 Redeclaration = true; 6769 6770 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6771 if (!OldDecl && !Invalid) { 6772 Diag(UsingLoc, diag::err_redefinition_different_kind) 6773 << Name.Identifier; 6774 6775 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6776 if (OldD->getLocation().isValid()) 6777 Diag(OldD->getLocation(), diag::note_previous_definition); 6778 6779 Invalid = true; 6780 } 6781 6782 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6783 if (TemplateParameterListsAreEqual(TemplateParams, 6784 OldDecl->getTemplateParameters(), 6785 /*Complain=*/true, 6786 TPL_TemplateMatch)) 6787 OldTemplateParams = OldDecl->getTemplateParameters(); 6788 else 6789 Invalid = true; 6790 6791 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6792 if (!Invalid && 6793 !Context.hasSameType(OldTD->getUnderlyingType(), 6794 NewTD->getUnderlyingType())) { 6795 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6796 // but we can't reasonably accept it. 6797 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6798 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6799 if (OldTD->getLocation().isValid()) 6800 Diag(OldTD->getLocation(), diag::note_previous_definition); 6801 Invalid = true; 6802 } 6803 } 6804 } 6805 6806 // Merge any previous default template arguments into our parameters, 6807 // and check the parameter list. 6808 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6809 TPC_TypeAliasTemplate)) 6810 return 0; 6811 6812 TypeAliasTemplateDecl *NewDecl = 6813 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6814 Name.Identifier, TemplateParams, 6815 NewTD); 6816 6817 NewDecl->setAccess(AS); 6818 6819 if (Invalid) 6820 NewDecl->setInvalidDecl(); 6821 else if (OldDecl) 6822 NewDecl->setPreviousDeclaration(OldDecl); 6823 6824 NewND = NewDecl; 6825 } else { 6826 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6827 NewND = NewTD; 6828 } 6829 6830 if (!Redeclaration) 6831 PushOnScopeChains(NewND, S); 6832 6833 return NewND; 6834} 6835 6836Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6837 SourceLocation NamespaceLoc, 6838 SourceLocation AliasLoc, 6839 IdentifierInfo *Alias, 6840 CXXScopeSpec &SS, 6841 SourceLocation IdentLoc, 6842 IdentifierInfo *Ident) { 6843 6844 // Lookup the namespace name. 6845 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6846 LookupParsedName(R, S, &SS); 6847 6848 // Check if we have a previous declaration with the same name. 6849 NamedDecl *PrevDecl 6850 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6851 ForRedeclaration); 6852 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6853 PrevDecl = 0; 6854 6855 if (PrevDecl) { 6856 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6857 // We already have an alias with the same name that points to the same 6858 // namespace, so don't create a new one. 6859 // FIXME: At some point, we'll want to create the (redundant) 6860 // declaration to maintain better source information. 6861 if (!R.isAmbiguous() && !R.empty() && 6862 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6863 return 0; 6864 } 6865 6866 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6867 diag::err_redefinition_different_kind; 6868 Diag(AliasLoc, DiagID) << Alias; 6869 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6870 return 0; 6871 } 6872 6873 if (R.isAmbiguous()) 6874 return 0; 6875 6876 if (R.empty()) { 6877 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6878 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6879 return 0; 6880 } 6881 } 6882 6883 NamespaceAliasDecl *AliasDecl = 6884 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6885 Alias, SS.getWithLocInContext(Context), 6886 IdentLoc, R.getFoundDecl()); 6887 6888 PushOnScopeChains(AliasDecl, S); 6889 return AliasDecl; 6890} 6891 6892namespace { 6893 /// \brief Scoped object used to handle the state changes required in Sema 6894 /// to implicitly define the body of a C++ member function; 6895 class ImplicitlyDefinedFunctionScope { 6896 Sema &S; 6897 Sema::ContextRAII SavedContext; 6898 6899 public: 6900 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6901 : S(S), SavedContext(S, Method) 6902 { 6903 S.PushFunctionScope(); 6904 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6905 } 6906 6907 ~ImplicitlyDefinedFunctionScope() { 6908 S.PopExpressionEvaluationContext(); 6909 S.PopFunctionOrBlockScope(); 6910 } 6911 }; 6912} 6913 6914Sema::ImplicitExceptionSpecification 6915Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6916 // C++ [except.spec]p14: 6917 // An implicitly declared special member function (Clause 12) shall have an 6918 // exception-specification. [...] 6919 ImplicitExceptionSpecification ExceptSpec(Context); 6920 if (ClassDecl->isInvalidDecl()) 6921 return ExceptSpec; 6922 6923 // Direct base-class constructors. 6924 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6925 BEnd = ClassDecl->bases_end(); 6926 B != BEnd; ++B) { 6927 if (B->isVirtual()) // Handled below. 6928 continue; 6929 6930 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6931 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6932 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6933 // If this is a deleted function, add it anyway. This might be conformant 6934 // with the standard. This might not. I'm not sure. It might not matter. 6935 if (Constructor) 6936 ExceptSpec.CalledDecl(Constructor); 6937 } 6938 } 6939 6940 // Virtual base-class constructors. 6941 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6942 BEnd = ClassDecl->vbases_end(); 6943 B != BEnd; ++B) { 6944 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6945 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6946 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6947 // If this is a deleted function, add it anyway. This might be conformant 6948 // with the standard. This might not. I'm not sure. It might not matter. 6949 if (Constructor) 6950 ExceptSpec.CalledDecl(Constructor); 6951 } 6952 } 6953 6954 // Field constructors. 6955 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6956 FEnd = ClassDecl->field_end(); 6957 F != FEnd; ++F) { 6958 if (F->hasInClassInitializer()) { 6959 if (Expr *E = F->getInClassInitializer()) 6960 ExceptSpec.CalledExpr(E); 6961 else if (!F->isInvalidDecl()) 6962 ExceptSpec.SetDelayed(); 6963 } else if (const RecordType *RecordTy 6964 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6965 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6966 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6967 // If this is a deleted function, add it anyway. This might be conformant 6968 // with the standard. This might not. I'm not sure. It might not matter. 6969 // In particular, the problem is that this function never gets called. It 6970 // might just be ill-formed because this function attempts to refer to 6971 // a deleted function here. 6972 if (Constructor) 6973 ExceptSpec.CalledDecl(Constructor); 6974 } 6975 } 6976 6977 return ExceptSpec; 6978} 6979 6980CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6981 CXXRecordDecl *ClassDecl) { 6982 // C++ [class.ctor]p5: 6983 // A default constructor for a class X is a constructor of class X 6984 // that can be called without an argument. If there is no 6985 // user-declared constructor for class X, a default constructor is 6986 // implicitly declared. An implicitly-declared default constructor 6987 // is an inline public member of its class. 6988 assert(!ClassDecl->hasUserDeclaredConstructor() && 6989 "Should not build implicit default constructor!"); 6990 6991 ImplicitExceptionSpecification Spec = 6992 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6993 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6994 6995 // Create the actual constructor declaration. 6996 CanQualType ClassType 6997 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6998 SourceLocation ClassLoc = ClassDecl->getLocation(); 6999 DeclarationName Name 7000 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7001 DeclarationNameInfo NameInfo(Name, ClassLoc); 7002 CXXConstructorDecl *DefaultCon 7003 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7004 Context.getFunctionType(Context.VoidTy, 7005 0, 0, EPI), 7006 /*TInfo=*/0, 7007 /*isExplicit=*/false, 7008 /*isInline=*/true, 7009 /*isImplicitlyDeclared=*/true, 7010 // FIXME: apply the rules for definitions here 7011 /*isConstexpr=*/false); 7012 DefaultCon->setAccess(AS_public); 7013 DefaultCon->setDefaulted(); 7014 DefaultCon->setImplicit(); 7015 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7016 7017 // Note that we have declared this constructor. 7018 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7019 7020 if (Scope *S = getScopeForContext(ClassDecl)) 7021 PushOnScopeChains(DefaultCon, S, false); 7022 ClassDecl->addDecl(DefaultCon); 7023 7024 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7025 DefaultCon->setDeletedAsWritten(); 7026 7027 return DefaultCon; 7028} 7029 7030void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7031 CXXConstructorDecl *Constructor) { 7032 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7033 !Constructor->doesThisDeclarationHaveABody() && 7034 !Constructor->isDeleted()) && 7035 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7036 7037 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7038 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7039 7040 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7041 DiagnosticErrorTrap Trap(Diags); 7042 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7043 Trap.hasErrorOccurred()) { 7044 Diag(CurrentLocation, diag::note_member_synthesized_at) 7045 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7046 Constructor->setInvalidDecl(); 7047 return; 7048 } 7049 7050 SourceLocation Loc = Constructor->getLocation(); 7051 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7052 7053 Constructor->setUsed(); 7054 MarkVTableUsed(CurrentLocation, ClassDecl); 7055 7056 if (ASTMutationListener *L = getASTMutationListener()) { 7057 L->CompletedImplicitDefinition(Constructor); 7058 } 7059} 7060 7061/// Get any existing defaulted default constructor for the given class. Do not 7062/// implicitly define one if it does not exist. 7063static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7064 CXXRecordDecl *D) { 7065 ASTContext &Context = Self.Context; 7066 QualType ClassType = Context.getTypeDeclType(D); 7067 DeclarationName ConstructorName 7068 = Context.DeclarationNames.getCXXConstructorName( 7069 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7070 7071 DeclContext::lookup_const_iterator Con, ConEnd; 7072 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7073 Con != ConEnd; ++Con) { 7074 // A function template cannot be defaulted. 7075 if (isa<FunctionTemplateDecl>(*Con)) 7076 continue; 7077 7078 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7079 if (Constructor->isDefaultConstructor()) 7080 return Constructor->isDefaulted() ? Constructor : 0; 7081 } 7082 return 0; 7083} 7084 7085void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7086 if (!D) return; 7087 AdjustDeclIfTemplate(D); 7088 7089 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7090 CXXConstructorDecl *CtorDecl 7091 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7092 7093 if (!CtorDecl) return; 7094 7095 // Compute the exception specification for the default constructor. 7096 const FunctionProtoType *CtorTy = 7097 CtorDecl->getType()->castAs<FunctionProtoType>(); 7098 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7099 ImplicitExceptionSpecification Spec = 7100 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7101 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7102 assert(EPI.ExceptionSpecType != EST_Delayed); 7103 7104 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7105 } 7106 7107 // If the default constructor is explicitly defaulted, checking the exception 7108 // specification is deferred until now. 7109 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7110 !ClassDecl->isDependentType()) 7111 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7112} 7113 7114void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7115 // We start with an initial pass over the base classes to collect those that 7116 // inherit constructors from. If there are none, we can forgo all further 7117 // processing. 7118 typedef SmallVector<const RecordType *, 4> BasesVector; 7119 BasesVector BasesToInheritFrom; 7120 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7121 BaseE = ClassDecl->bases_end(); 7122 BaseIt != BaseE; ++BaseIt) { 7123 if (BaseIt->getInheritConstructors()) { 7124 QualType Base = BaseIt->getType(); 7125 if (Base->isDependentType()) { 7126 // If we inherit constructors from anything that is dependent, just 7127 // abort processing altogether. We'll get another chance for the 7128 // instantiations. 7129 return; 7130 } 7131 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7132 } 7133 } 7134 if (BasesToInheritFrom.empty()) 7135 return; 7136 7137 // Now collect the constructors that we already have in the current class. 7138 // Those take precedence over inherited constructors. 7139 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7140 // unless there is a user-declared constructor with the same signature in 7141 // the class where the using-declaration appears. 7142 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7143 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7144 CtorE = ClassDecl->ctor_end(); 7145 CtorIt != CtorE; ++CtorIt) { 7146 ExistingConstructors.insert( 7147 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7148 } 7149 7150 Scope *S = getScopeForContext(ClassDecl); 7151 DeclarationName CreatedCtorName = 7152 Context.DeclarationNames.getCXXConstructorName( 7153 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7154 7155 // Now comes the true work. 7156 // First, we keep a map from constructor types to the base that introduced 7157 // them. Needed for finding conflicting constructors. We also keep the 7158 // actually inserted declarations in there, for pretty diagnostics. 7159 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7160 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7161 ConstructorToSourceMap InheritedConstructors; 7162 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7163 BaseE = BasesToInheritFrom.end(); 7164 BaseIt != BaseE; ++BaseIt) { 7165 const RecordType *Base = *BaseIt; 7166 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7167 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7168 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7169 CtorE = BaseDecl->ctor_end(); 7170 CtorIt != CtorE; ++CtorIt) { 7171 // Find the using declaration for inheriting this base's constructors. 7172 DeclarationName Name = 7173 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7174 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7175 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7176 SourceLocation UsingLoc = UD ? UD->getLocation() : 7177 ClassDecl->getLocation(); 7178 7179 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7180 // from the class X named in the using-declaration consists of actual 7181 // constructors and notional constructors that result from the 7182 // transformation of defaulted parameters as follows: 7183 // - all non-template default constructors of X, and 7184 // - for each non-template constructor of X that has at least one 7185 // parameter with a default argument, the set of constructors that 7186 // results from omitting any ellipsis parameter specification and 7187 // successively omitting parameters with a default argument from the 7188 // end of the parameter-type-list. 7189 CXXConstructorDecl *BaseCtor = *CtorIt; 7190 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7191 const FunctionProtoType *BaseCtorType = 7192 BaseCtor->getType()->getAs<FunctionProtoType>(); 7193 7194 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7195 maxParams = BaseCtor->getNumParams(); 7196 params <= maxParams; ++params) { 7197 // Skip default constructors. They're never inherited. 7198 if (params == 0) 7199 continue; 7200 // Skip copy and move constructors for the same reason. 7201 if (CanBeCopyOrMove && params == 1) 7202 continue; 7203 7204 // Build up a function type for this particular constructor. 7205 // FIXME: The working paper does not consider that the exception spec 7206 // for the inheriting constructor might be larger than that of the 7207 // source. This code doesn't yet, either. When it does, this code will 7208 // need to be delayed until after exception specifications and in-class 7209 // member initializers are attached. 7210 const Type *NewCtorType; 7211 if (params == maxParams) 7212 NewCtorType = BaseCtorType; 7213 else { 7214 SmallVector<QualType, 16> Args; 7215 for (unsigned i = 0; i < params; ++i) { 7216 Args.push_back(BaseCtorType->getArgType(i)); 7217 } 7218 FunctionProtoType::ExtProtoInfo ExtInfo = 7219 BaseCtorType->getExtProtoInfo(); 7220 ExtInfo.Variadic = false; 7221 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7222 Args.data(), params, ExtInfo) 7223 .getTypePtr(); 7224 } 7225 const Type *CanonicalNewCtorType = 7226 Context.getCanonicalType(NewCtorType); 7227 7228 // Now that we have the type, first check if the class already has a 7229 // constructor with this signature. 7230 if (ExistingConstructors.count(CanonicalNewCtorType)) 7231 continue; 7232 7233 // Then we check if we have already declared an inherited constructor 7234 // with this signature. 7235 std::pair<ConstructorToSourceMap::iterator, bool> result = 7236 InheritedConstructors.insert(std::make_pair( 7237 CanonicalNewCtorType, 7238 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7239 if (!result.second) { 7240 // Already in the map. If it came from a different class, that's an 7241 // error. Not if it's from the same. 7242 CanQualType PreviousBase = result.first->second.first; 7243 if (CanonicalBase != PreviousBase) { 7244 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7245 const CXXConstructorDecl *PrevBaseCtor = 7246 PrevCtor->getInheritedConstructor(); 7247 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7248 7249 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7250 Diag(BaseCtor->getLocation(), 7251 diag::note_using_decl_constructor_conflict_current_ctor); 7252 Diag(PrevBaseCtor->getLocation(), 7253 diag::note_using_decl_constructor_conflict_previous_ctor); 7254 Diag(PrevCtor->getLocation(), 7255 diag::note_using_decl_constructor_conflict_previous_using); 7256 } 7257 continue; 7258 } 7259 7260 // OK, we're there, now add the constructor. 7261 // C++0x [class.inhctor]p8: [...] that would be performed by a 7262 // user-written inline constructor [...] 7263 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7264 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7265 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7266 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7267 /*ImplicitlyDeclared=*/true, 7268 // FIXME: Due to a defect in the standard, we treat inherited 7269 // constructors as constexpr even if that makes them ill-formed. 7270 /*Constexpr=*/BaseCtor->isConstexpr()); 7271 NewCtor->setAccess(BaseCtor->getAccess()); 7272 7273 // Build up the parameter decls and add them. 7274 SmallVector<ParmVarDecl *, 16> ParamDecls; 7275 for (unsigned i = 0; i < params; ++i) { 7276 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7277 UsingLoc, UsingLoc, 7278 /*IdentifierInfo=*/0, 7279 BaseCtorType->getArgType(i), 7280 /*TInfo=*/0, SC_None, 7281 SC_None, /*DefaultArg=*/0)); 7282 } 7283 NewCtor->setParams(ParamDecls); 7284 NewCtor->setInheritedConstructor(BaseCtor); 7285 7286 PushOnScopeChains(NewCtor, S, false); 7287 ClassDecl->addDecl(NewCtor); 7288 result.first->second.second = NewCtor; 7289 } 7290 } 7291 } 7292} 7293 7294Sema::ImplicitExceptionSpecification 7295Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7296 // C++ [except.spec]p14: 7297 // An implicitly declared special member function (Clause 12) shall have 7298 // an exception-specification. 7299 ImplicitExceptionSpecification ExceptSpec(Context); 7300 if (ClassDecl->isInvalidDecl()) 7301 return ExceptSpec; 7302 7303 // Direct base-class destructors. 7304 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7305 BEnd = ClassDecl->bases_end(); 7306 B != BEnd; ++B) { 7307 if (B->isVirtual()) // Handled below. 7308 continue; 7309 7310 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7311 ExceptSpec.CalledDecl( 7312 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7313 } 7314 7315 // Virtual base-class destructors. 7316 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7317 BEnd = ClassDecl->vbases_end(); 7318 B != BEnd; ++B) { 7319 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7320 ExceptSpec.CalledDecl( 7321 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7322 } 7323 7324 // Field destructors. 7325 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7326 FEnd = ClassDecl->field_end(); 7327 F != FEnd; ++F) { 7328 if (const RecordType *RecordTy 7329 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7330 ExceptSpec.CalledDecl( 7331 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7332 } 7333 7334 return ExceptSpec; 7335} 7336 7337CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7338 // C++ [class.dtor]p2: 7339 // If a class has no user-declared destructor, a destructor is 7340 // declared implicitly. An implicitly-declared destructor is an 7341 // inline public member of its class. 7342 7343 ImplicitExceptionSpecification Spec = 7344 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7345 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7346 7347 // Create the actual destructor declaration. 7348 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7349 7350 CanQualType ClassType 7351 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7352 SourceLocation ClassLoc = ClassDecl->getLocation(); 7353 DeclarationName Name 7354 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7355 DeclarationNameInfo NameInfo(Name, ClassLoc); 7356 CXXDestructorDecl *Destructor 7357 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7358 /*isInline=*/true, 7359 /*isImplicitlyDeclared=*/true); 7360 Destructor->setAccess(AS_public); 7361 Destructor->setDefaulted(); 7362 Destructor->setImplicit(); 7363 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7364 7365 // Note that we have declared this destructor. 7366 ++ASTContext::NumImplicitDestructorsDeclared; 7367 7368 // Introduce this destructor into its scope. 7369 if (Scope *S = getScopeForContext(ClassDecl)) 7370 PushOnScopeChains(Destructor, S, false); 7371 ClassDecl->addDecl(Destructor); 7372 7373 // This could be uniqued if it ever proves significant. 7374 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7375 7376 if (ShouldDeleteDestructor(Destructor)) 7377 Destructor->setDeletedAsWritten(); 7378 7379 AddOverriddenMethods(ClassDecl, Destructor); 7380 7381 return Destructor; 7382} 7383 7384void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7385 CXXDestructorDecl *Destructor) { 7386 assert((Destructor->isDefaulted() && 7387 !Destructor->doesThisDeclarationHaveABody()) && 7388 "DefineImplicitDestructor - call it for implicit default dtor"); 7389 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7390 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7391 7392 if (Destructor->isInvalidDecl()) 7393 return; 7394 7395 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7396 7397 DiagnosticErrorTrap Trap(Diags); 7398 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7399 Destructor->getParent()); 7400 7401 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7402 Diag(CurrentLocation, diag::note_member_synthesized_at) 7403 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7404 7405 Destructor->setInvalidDecl(); 7406 return; 7407 } 7408 7409 SourceLocation Loc = Destructor->getLocation(); 7410 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7411 Destructor->setImplicitlyDefined(true); 7412 Destructor->setUsed(); 7413 MarkVTableUsed(CurrentLocation, ClassDecl); 7414 7415 if (ASTMutationListener *L = getASTMutationListener()) { 7416 L->CompletedImplicitDefinition(Destructor); 7417 } 7418} 7419 7420void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7421 CXXDestructorDecl *destructor) { 7422 // C++11 [class.dtor]p3: 7423 // A declaration of a destructor that does not have an exception- 7424 // specification is implicitly considered to have the same exception- 7425 // specification as an implicit declaration. 7426 const FunctionProtoType *dtorType = destructor->getType()-> 7427 getAs<FunctionProtoType>(); 7428 if (dtorType->hasExceptionSpec()) 7429 return; 7430 7431 ImplicitExceptionSpecification exceptSpec = 7432 ComputeDefaultedDtorExceptionSpec(classDecl); 7433 7434 // Replace the destructor's type, building off the existing one. Fortunately, 7435 // the only thing of interest in the destructor type is its extended info. 7436 // The return and arguments are fixed. 7437 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7438 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7439 epi.NumExceptions = exceptSpec.size(); 7440 epi.Exceptions = exceptSpec.data(); 7441 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7442 7443 destructor->setType(ty); 7444 7445 // FIXME: If the destructor has a body that could throw, and the newly created 7446 // spec doesn't allow exceptions, we should emit a warning, because this 7447 // change in behavior can break conforming C++03 programs at runtime. 7448 // However, we don't have a body yet, so it needs to be done somewhere else. 7449} 7450 7451/// \brief Builds a statement that copies/moves the given entity from \p From to 7452/// \c To. 7453/// 7454/// This routine is used to copy/move the members of a class with an 7455/// implicitly-declared copy/move assignment operator. When the entities being 7456/// copied are arrays, this routine builds for loops to copy them. 7457/// 7458/// \param S The Sema object used for type-checking. 7459/// 7460/// \param Loc The location where the implicit copy/move is being generated. 7461/// 7462/// \param T The type of the expressions being copied/moved. Both expressions 7463/// must have this type. 7464/// 7465/// \param To The expression we are copying/moving to. 7466/// 7467/// \param From The expression we are copying/moving from. 7468/// 7469/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7470/// Otherwise, it's a non-static member subobject. 7471/// 7472/// \param Copying Whether we're copying or moving. 7473/// 7474/// \param Depth Internal parameter recording the depth of the recursion. 7475/// 7476/// \returns A statement or a loop that copies the expressions. 7477static StmtResult 7478BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7479 Expr *To, Expr *From, 7480 bool CopyingBaseSubobject, bool Copying, 7481 unsigned Depth = 0) { 7482 // C++0x [class.copy]p28: 7483 // Each subobject is assigned in the manner appropriate to its type: 7484 // 7485 // - if the subobject is of class type, as if by a call to operator= with 7486 // the subobject as the object expression and the corresponding 7487 // subobject of x as a single function argument (as if by explicit 7488 // qualification; that is, ignoring any possible virtual overriding 7489 // functions in more derived classes); 7490 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7491 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7492 7493 // Look for operator=. 7494 DeclarationName Name 7495 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7496 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7497 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7498 7499 // Filter out any result that isn't a copy/move-assignment operator. 7500 LookupResult::Filter F = OpLookup.makeFilter(); 7501 while (F.hasNext()) { 7502 NamedDecl *D = F.next(); 7503 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7504 if (Copying ? Method->isCopyAssignmentOperator() : 7505 Method->isMoveAssignmentOperator()) 7506 continue; 7507 7508 F.erase(); 7509 } 7510 F.done(); 7511 7512 // Suppress the protected check (C++ [class.protected]) for each of the 7513 // assignment operators we found. This strange dance is required when 7514 // we're assigning via a base classes's copy-assignment operator. To 7515 // ensure that we're getting the right base class subobject (without 7516 // ambiguities), we need to cast "this" to that subobject type; to 7517 // ensure that we don't go through the virtual call mechanism, we need 7518 // to qualify the operator= name with the base class (see below). However, 7519 // this means that if the base class has a protected copy assignment 7520 // operator, the protected member access check will fail. So, we 7521 // rewrite "protected" access to "public" access in this case, since we 7522 // know by construction that we're calling from a derived class. 7523 if (CopyingBaseSubobject) { 7524 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7525 L != LEnd; ++L) { 7526 if (L.getAccess() == AS_protected) 7527 L.setAccess(AS_public); 7528 } 7529 } 7530 7531 // Create the nested-name-specifier that will be used to qualify the 7532 // reference to operator=; this is required to suppress the virtual 7533 // call mechanism. 7534 CXXScopeSpec SS; 7535 SS.MakeTrivial(S.Context, 7536 NestedNameSpecifier::Create(S.Context, 0, false, 7537 T.getTypePtr()), 7538 Loc); 7539 7540 // Create the reference to operator=. 7541 ExprResult OpEqualRef 7542 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7543 /*FirstQualifierInScope=*/0, OpLookup, 7544 /*TemplateArgs=*/0, 7545 /*SuppressQualifierCheck=*/true); 7546 if (OpEqualRef.isInvalid()) 7547 return StmtError(); 7548 7549 // Build the call to the assignment operator. 7550 7551 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7552 OpEqualRef.takeAs<Expr>(), 7553 Loc, &From, 1, Loc); 7554 if (Call.isInvalid()) 7555 return StmtError(); 7556 7557 return S.Owned(Call.takeAs<Stmt>()); 7558 } 7559 7560 // - if the subobject is of scalar type, the built-in assignment 7561 // operator is used. 7562 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7563 if (!ArrayTy) { 7564 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7565 if (Assignment.isInvalid()) 7566 return StmtError(); 7567 7568 return S.Owned(Assignment.takeAs<Stmt>()); 7569 } 7570 7571 // - if the subobject is an array, each element is assigned, in the 7572 // manner appropriate to the element type; 7573 7574 // Construct a loop over the array bounds, e.g., 7575 // 7576 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7577 // 7578 // that will copy each of the array elements. 7579 QualType SizeType = S.Context.getSizeType(); 7580 7581 // Create the iteration variable. 7582 IdentifierInfo *IterationVarName = 0; 7583 { 7584 llvm::SmallString<8> Str; 7585 llvm::raw_svector_ostream OS(Str); 7586 OS << "__i" << Depth; 7587 IterationVarName = &S.Context.Idents.get(OS.str()); 7588 } 7589 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7590 IterationVarName, SizeType, 7591 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7592 SC_None, SC_None); 7593 7594 // Initialize the iteration variable to zero. 7595 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7596 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7597 7598 // Create a reference to the iteration variable; we'll use this several 7599 // times throughout. 7600 Expr *IterationVarRef 7601 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7602 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7603 7604 // Create the DeclStmt that holds the iteration variable. 7605 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7606 7607 // Create the comparison against the array bound. 7608 llvm::APInt Upper 7609 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7610 Expr *Comparison 7611 = new (S.Context) BinaryOperator(IterationVarRef, 7612 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7613 BO_NE, S.Context.BoolTy, 7614 VK_RValue, OK_Ordinary, Loc); 7615 7616 // Create the pre-increment of the iteration variable. 7617 Expr *Increment 7618 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7619 VK_LValue, OK_Ordinary, Loc); 7620 7621 // Subscript the "from" and "to" expressions with the iteration variable. 7622 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7623 IterationVarRef, Loc)); 7624 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7625 IterationVarRef, Loc)); 7626 if (!Copying) // Cast to rvalue 7627 From = CastForMoving(S, From); 7628 7629 // Build the copy/move for an individual element of the array. 7630 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7631 To, From, CopyingBaseSubobject, 7632 Copying, Depth + 1); 7633 if (Copy.isInvalid()) 7634 return StmtError(); 7635 7636 // Construct the loop that copies all elements of this array. 7637 return S.ActOnForStmt(Loc, Loc, InitStmt, 7638 S.MakeFullExpr(Comparison), 7639 0, S.MakeFullExpr(Increment), 7640 Loc, Copy.take()); 7641} 7642 7643std::pair<Sema::ImplicitExceptionSpecification, bool> 7644Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7645 CXXRecordDecl *ClassDecl) { 7646 if (ClassDecl->isInvalidDecl()) 7647 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7648 7649 // C++ [class.copy]p10: 7650 // If the class definition does not explicitly declare a copy 7651 // assignment operator, one is declared implicitly. 7652 // The implicitly-defined copy assignment operator for a class X 7653 // will have the form 7654 // 7655 // X& X::operator=(const X&) 7656 // 7657 // if 7658 bool HasConstCopyAssignment = true; 7659 7660 // -- each direct base class B of X has a copy assignment operator 7661 // whose parameter is of type const B&, const volatile B& or B, 7662 // and 7663 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7664 BaseEnd = ClassDecl->bases_end(); 7665 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7666 // We'll handle this below 7667 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7668 continue; 7669 7670 assert(!Base->getType()->isDependentType() && 7671 "Cannot generate implicit members for class with dependent bases."); 7672 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7673 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7674 &HasConstCopyAssignment); 7675 } 7676 7677 // In C++0x, the above citation has "or virtual added" 7678 if (LangOpts.CPlusPlus0x) { 7679 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7680 BaseEnd = ClassDecl->vbases_end(); 7681 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7682 assert(!Base->getType()->isDependentType() && 7683 "Cannot generate implicit members for class with dependent bases."); 7684 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7685 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7686 &HasConstCopyAssignment); 7687 } 7688 } 7689 7690 // -- for all the nonstatic data members of X that are of a class 7691 // type M (or array thereof), each such class type has a copy 7692 // assignment operator whose parameter is of type const M&, 7693 // const volatile M& or M. 7694 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7695 FieldEnd = ClassDecl->field_end(); 7696 HasConstCopyAssignment && Field != FieldEnd; 7697 ++Field) { 7698 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7699 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7700 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7701 &HasConstCopyAssignment); 7702 } 7703 } 7704 7705 // Otherwise, the implicitly declared copy assignment operator will 7706 // have the form 7707 // 7708 // X& X::operator=(X&) 7709 7710 // C++ [except.spec]p14: 7711 // An implicitly declared special member function (Clause 12) shall have an 7712 // exception-specification. [...] 7713 7714 // It is unspecified whether or not an implicit copy assignment operator 7715 // attempts to deduplicate calls to assignment operators of virtual bases are 7716 // made. As such, this exception specification is effectively unspecified. 7717 // Based on a similar decision made for constness in C++0x, we're erring on 7718 // the side of assuming such calls to be made regardless of whether they 7719 // actually happen. 7720 ImplicitExceptionSpecification ExceptSpec(Context); 7721 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7722 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7723 BaseEnd = ClassDecl->bases_end(); 7724 Base != BaseEnd; ++Base) { 7725 if (Base->isVirtual()) 7726 continue; 7727 7728 CXXRecordDecl *BaseClassDecl 7729 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7730 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7731 ArgQuals, false, 0)) 7732 ExceptSpec.CalledDecl(CopyAssign); 7733 } 7734 7735 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7736 BaseEnd = ClassDecl->vbases_end(); 7737 Base != BaseEnd; ++Base) { 7738 CXXRecordDecl *BaseClassDecl 7739 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7740 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7741 ArgQuals, false, 0)) 7742 ExceptSpec.CalledDecl(CopyAssign); 7743 } 7744 7745 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7746 FieldEnd = ClassDecl->field_end(); 7747 Field != FieldEnd; 7748 ++Field) { 7749 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7750 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7751 if (CXXMethodDecl *CopyAssign = 7752 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7753 ExceptSpec.CalledDecl(CopyAssign); 7754 } 7755 } 7756 7757 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7758} 7759 7760CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7761 // Note: The following rules are largely analoguous to the copy 7762 // constructor rules. Note that virtual bases are not taken into account 7763 // for determining the argument type of the operator. Note also that 7764 // operators taking an object instead of a reference are allowed. 7765 7766 ImplicitExceptionSpecification Spec(Context); 7767 bool Const; 7768 llvm::tie(Spec, Const) = 7769 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7770 7771 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7772 QualType RetType = Context.getLValueReferenceType(ArgType); 7773 if (Const) 7774 ArgType = ArgType.withConst(); 7775 ArgType = Context.getLValueReferenceType(ArgType); 7776 7777 // An implicitly-declared copy assignment operator is an inline public 7778 // member of its class. 7779 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7780 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7781 SourceLocation ClassLoc = ClassDecl->getLocation(); 7782 DeclarationNameInfo NameInfo(Name, ClassLoc); 7783 CXXMethodDecl *CopyAssignment 7784 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7785 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7786 /*TInfo=*/0, /*isStatic=*/false, 7787 /*StorageClassAsWritten=*/SC_None, 7788 /*isInline=*/true, /*isConstexpr=*/false, 7789 SourceLocation()); 7790 CopyAssignment->setAccess(AS_public); 7791 CopyAssignment->setDefaulted(); 7792 CopyAssignment->setImplicit(); 7793 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7794 7795 // Add the parameter to the operator. 7796 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7797 ClassLoc, ClassLoc, /*Id=*/0, 7798 ArgType, /*TInfo=*/0, 7799 SC_None, 7800 SC_None, 0); 7801 CopyAssignment->setParams(FromParam); 7802 7803 // Note that we have added this copy-assignment operator. 7804 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7805 7806 if (Scope *S = getScopeForContext(ClassDecl)) 7807 PushOnScopeChains(CopyAssignment, S, false); 7808 ClassDecl->addDecl(CopyAssignment); 7809 7810 // C++0x [class.copy]p18: 7811 // ... If the class definition declares a move constructor or move 7812 // assignment operator, the implicitly declared copy assignment operator is 7813 // defined as deleted; ... 7814 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7815 ClassDecl->hasUserDeclaredMoveAssignment() || 7816 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7817 CopyAssignment->setDeletedAsWritten(); 7818 7819 AddOverriddenMethods(ClassDecl, CopyAssignment); 7820 return CopyAssignment; 7821} 7822 7823void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7824 CXXMethodDecl *CopyAssignOperator) { 7825 assert((CopyAssignOperator->isDefaulted() && 7826 CopyAssignOperator->isOverloadedOperator() && 7827 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7828 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7829 "DefineImplicitCopyAssignment called for wrong function"); 7830 7831 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7832 7833 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7834 CopyAssignOperator->setInvalidDecl(); 7835 return; 7836 } 7837 7838 CopyAssignOperator->setUsed(); 7839 7840 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7841 DiagnosticErrorTrap Trap(Diags); 7842 7843 // C++0x [class.copy]p30: 7844 // The implicitly-defined or explicitly-defaulted copy assignment operator 7845 // for a non-union class X performs memberwise copy assignment of its 7846 // subobjects. The direct base classes of X are assigned first, in the 7847 // order of their declaration in the base-specifier-list, and then the 7848 // immediate non-static data members of X are assigned, in the order in 7849 // which they were declared in the class definition. 7850 7851 // The statements that form the synthesized function body. 7852 ASTOwningVector<Stmt*> Statements(*this); 7853 7854 // The parameter for the "other" object, which we are copying from. 7855 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7856 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7857 QualType OtherRefType = Other->getType(); 7858 if (const LValueReferenceType *OtherRef 7859 = OtherRefType->getAs<LValueReferenceType>()) { 7860 OtherRefType = OtherRef->getPointeeType(); 7861 OtherQuals = OtherRefType.getQualifiers(); 7862 } 7863 7864 // Our location for everything implicitly-generated. 7865 SourceLocation Loc = CopyAssignOperator->getLocation(); 7866 7867 // Construct a reference to the "other" object. We'll be using this 7868 // throughout the generated ASTs. 7869 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7870 assert(OtherRef && "Reference to parameter cannot fail!"); 7871 7872 // Construct the "this" pointer. We'll be using this throughout the generated 7873 // ASTs. 7874 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7875 assert(This && "Reference to this cannot fail!"); 7876 7877 // Assign base classes. 7878 bool Invalid = false; 7879 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7880 E = ClassDecl->bases_end(); Base != E; ++Base) { 7881 // Form the assignment: 7882 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7883 QualType BaseType = Base->getType().getUnqualifiedType(); 7884 if (!BaseType->isRecordType()) { 7885 Invalid = true; 7886 continue; 7887 } 7888 7889 CXXCastPath BasePath; 7890 BasePath.push_back(Base); 7891 7892 // Construct the "from" expression, which is an implicit cast to the 7893 // appropriately-qualified base type. 7894 Expr *From = OtherRef; 7895 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7896 CK_UncheckedDerivedToBase, 7897 VK_LValue, &BasePath).take(); 7898 7899 // Dereference "this". 7900 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7901 7902 // Implicitly cast "this" to the appropriately-qualified base type. 7903 To = ImpCastExprToType(To.take(), 7904 Context.getCVRQualifiedType(BaseType, 7905 CopyAssignOperator->getTypeQualifiers()), 7906 CK_UncheckedDerivedToBase, 7907 VK_LValue, &BasePath); 7908 7909 // Build the copy. 7910 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7911 To.get(), From, 7912 /*CopyingBaseSubobject=*/true, 7913 /*Copying=*/true); 7914 if (Copy.isInvalid()) { 7915 Diag(CurrentLocation, diag::note_member_synthesized_at) 7916 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7917 CopyAssignOperator->setInvalidDecl(); 7918 return; 7919 } 7920 7921 // Success! Record the copy. 7922 Statements.push_back(Copy.takeAs<Expr>()); 7923 } 7924 7925 // \brief Reference to the __builtin_memcpy function. 7926 Expr *BuiltinMemCpyRef = 0; 7927 // \brief Reference to the __builtin_objc_memmove_collectable function. 7928 Expr *CollectableMemCpyRef = 0; 7929 7930 // Assign non-static members. 7931 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7932 FieldEnd = ClassDecl->field_end(); 7933 Field != FieldEnd; ++Field) { 7934 // Check for members of reference type; we can't copy those. 7935 if (Field->getType()->isReferenceType()) { 7936 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7937 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7938 Diag(Field->getLocation(), diag::note_declared_at); 7939 Diag(CurrentLocation, diag::note_member_synthesized_at) 7940 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7941 Invalid = true; 7942 continue; 7943 } 7944 7945 // Check for members of const-qualified, non-class type. 7946 QualType BaseType = Context.getBaseElementType(Field->getType()); 7947 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7948 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7949 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7950 Diag(Field->getLocation(), diag::note_declared_at); 7951 Diag(CurrentLocation, diag::note_member_synthesized_at) 7952 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7953 Invalid = true; 7954 continue; 7955 } 7956 7957 // Suppress assigning zero-width bitfields. 7958 if (const Expr *Width = Field->getBitWidth()) 7959 if (Width->EvaluateAsInt(Context) == 0) 7960 continue; 7961 7962 QualType FieldType = Field->getType().getNonReferenceType(); 7963 if (FieldType->isIncompleteArrayType()) { 7964 assert(ClassDecl->hasFlexibleArrayMember() && 7965 "Incomplete array type is not valid"); 7966 continue; 7967 } 7968 7969 // Build references to the field in the object we're copying from and to. 7970 CXXScopeSpec SS; // Intentionally empty 7971 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7972 LookupMemberName); 7973 MemberLookup.addDecl(*Field); 7974 MemberLookup.resolveKind(); 7975 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7976 Loc, /*IsArrow=*/false, 7977 SS, 0, MemberLookup, 0); 7978 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7979 Loc, /*IsArrow=*/true, 7980 SS, 0, MemberLookup, 0); 7981 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7982 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7983 7984 // If the field should be copied with __builtin_memcpy rather than via 7985 // explicit assignments, do so. This optimization only applies for arrays 7986 // of scalars and arrays of class type with trivial copy-assignment 7987 // operators. 7988 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7989 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7990 // Compute the size of the memory buffer to be copied. 7991 QualType SizeType = Context.getSizeType(); 7992 llvm::APInt Size(Context.getTypeSize(SizeType), 7993 Context.getTypeSizeInChars(BaseType).getQuantity()); 7994 for (const ConstantArrayType *Array 7995 = Context.getAsConstantArrayType(FieldType); 7996 Array; 7997 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7998 llvm::APInt ArraySize 7999 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8000 Size *= ArraySize; 8001 } 8002 8003 // Take the address of the field references for "from" and "to". 8004 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8005 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8006 8007 bool NeedsCollectableMemCpy = 8008 (BaseType->isRecordType() && 8009 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8010 8011 if (NeedsCollectableMemCpy) { 8012 if (!CollectableMemCpyRef) { 8013 // Create a reference to the __builtin_objc_memmove_collectable function. 8014 LookupResult R(*this, 8015 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8016 Loc, LookupOrdinaryName); 8017 LookupName(R, TUScope, true); 8018 8019 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8020 if (!CollectableMemCpy) { 8021 // Something went horribly wrong earlier, and we will have 8022 // complained about it. 8023 Invalid = true; 8024 continue; 8025 } 8026 8027 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8028 CollectableMemCpy->getType(), 8029 VK_LValue, Loc, 0).take(); 8030 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8031 } 8032 } 8033 // Create a reference to the __builtin_memcpy builtin function. 8034 else if (!BuiltinMemCpyRef) { 8035 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8036 LookupOrdinaryName); 8037 LookupName(R, TUScope, true); 8038 8039 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8040 if (!BuiltinMemCpy) { 8041 // Something went horribly wrong earlier, and we will have complained 8042 // about it. 8043 Invalid = true; 8044 continue; 8045 } 8046 8047 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8048 BuiltinMemCpy->getType(), 8049 VK_LValue, Loc, 0).take(); 8050 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8051 } 8052 8053 ASTOwningVector<Expr*> CallArgs(*this); 8054 CallArgs.push_back(To.takeAs<Expr>()); 8055 CallArgs.push_back(From.takeAs<Expr>()); 8056 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8057 ExprResult Call = ExprError(); 8058 if (NeedsCollectableMemCpy) 8059 Call = ActOnCallExpr(/*Scope=*/0, 8060 CollectableMemCpyRef, 8061 Loc, move_arg(CallArgs), 8062 Loc); 8063 else 8064 Call = ActOnCallExpr(/*Scope=*/0, 8065 BuiltinMemCpyRef, 8066 Loc, move_arg(CallArgs), 8067 Loc); 8068 8069 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8070 Statements.push_back(Call.takeAs<Expr>()); 8071 continue; 8072 } 8073 8074 // Build the copy of this field. 8075 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8076 To.get(), From.get(), 8077 /*CopyingBaseSubobject=*/false, 8078 /*Copying=*/true); 8079 if (Copy.isInvalid()) { 8080 Diag(CurrentLocation, diag::note_member_synthesized_at) 8081 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8082 CopyAssignOperator->setInvalidDecl(); 8083 return; 8084 } 8085 8086 // Success! Record the copy. 8087 Statements.push_back(Copy.takeAs<Stmt>()); 8088 } 8089 8090 if (!Invalid) { 8091 // Add a "return *this;" 8092 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8093 8094 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8095 if (Return.isInvalid()) 8096 Invalid = true; 8097 else { 8098 Statements.push_back(Return.takeAs<Stmt>()); 8099 8100 if (Trap.hasErrorOccurred()) { 8101 Diag(CurrentLocation, diag::note_member_synthesized_at) 8102 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8103 Invalid = true; 8104 } 8105 } 8106 } 8107 8108 if (Invalid) { 8109 CopyAssignOperator->setInvalidDecl(); 8110 return; 8111 } 8112 8113 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8114 /*isStmtExpr=*/false); 8115 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8116 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8117 8118 if (ASTMutationListener *L = getASTMutationListener()) { 8119 L->CompletedImplicitDefinition(CopyAssignOperator); 8120 } 8121} 8122 8123Sema::ImplicitExceptionSpecification 8124Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8125 ImplicitExceptionSpecification ExceptSpec(Context); 8126 8127 if (ClassDecl->isInvalidDecl()) 8128 return ExceptSpec; 8129 8130 // C++0x [except.spec]p14: 8131 // An implicitly declared special member function (Clause 12) shall have an 8132 // exception-specification. [...] 8133 8134 // It is unspecified whether or not an implicit move assignment operator 8135 // attempts to deduplicate calls to assignment operators of virtual bases are 8136 // made. As such, this exception specification is effectively unspecified. 8137 // Based on a similar decision made for constness in C++0x, we're erring on 8138 // the side of assuming such calls to be made regardless of whether they 8139 // actually happen. 8140 // Note that a move constructor is not implicitly declared when there are 8141 // virtual bases, but it can still be user-declared and explicitly defaulted. 8142 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8143 BaseEnd = ClassDecl->bases_end(); 8144 Base != BaseEnd; ++Base) { 8145 if (Base->isVirtual()) 8146 continue; 8147 8148 CXXRecordDecl *BaseClassDecl 8149 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8150 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8151 false, 0)) 8152 ExceptSpec.CalledDecl(MoveAssign); 8153 } 8154 8155 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8156 BaseEnd = ClassDecl->vbases_end(); 8157 Base != BaseEnd; ++Base) { 8158 CXXRecordDecl *BaseClassDecl 8159 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8160 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8161 false, 0)) 8162 ExceptSpec.CalledDecl(MoveAssign); 8163 } 8164 8165 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8166 FieldEnd = ClassDecl->field_end(); 8167 Field != FieldEnd; 8168 ++Field) { 8169 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8170 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8171 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8172 false, 0)) 8173 ExceptSpec.CalledDecl(MoveAssign); 8174 } 8175 } 8176 8177 return ExceptSpec; 8178} 8179 8180CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8181 // Note: The following rules are largely analoguous to the move 8182 // constructor rules. 8183 8184 ImplicitExceptionSpecification Spec( 8185 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8186 8187 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8188 QualType RetType = Context.getLValueReferenceType(ArgType); 8189 ArgType = Context.getRValueReferenceType(ArgType); 8190 8191 // An implicitly-declared move assignment operator is an inline public 8192 // member of its class. 8193 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8194 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8195 SourceLocation ClassLoc = ClassDecl->getLocation(); 8196 DeclarationNameInfo NameInfo(Name, ClassLoc); 8197 CXXMethodDecl *MoveAssignment 8198 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8199 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8200 /*TInfo=*/0, /*isStatic=*/false, 8201 /*StorageClassAsWritten=*/SC_None, 8202 /*isInline=*/true, 8203 /*isConstexpr=*/false, 8204 SourceLocation()); 8205 MoveAssignment->setAccess(AS_public); 8206 MoveAssignment->setDefaulted(); 8207 MoveAssignment->setImplicit(); 8208 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8209 8210 // Add the parameter to the operator. 8211 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8212 ClassLoc, ClassLoc, /*Id=*/0, 8213 ArgType, /*TInfo=*/0, 8214 SC_None, 8215 SC_None, 0); 8216 MoveAssignment->setParams(FromParam); 8217 8218 // Note that we have added this copy-assignment operator. 8219 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8220 8221 // C++0x [class.copy]p9: 8222 // If the definition of a class X does not explicitly declare a move 8223 // assignment operator, one will be implicitly declared as defaulted if and 8224 // only if: 8225 // [...] 8226 // - the move assignment operator would not be implicitly defined as 8227 // deleted. 8228 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8229 // Cache this result so that we don't try to generate this over and over 8230 // on every lookup, leaking memory and wasting time. 8231 ClassDecl->setFailedImplicitMoveAssignment(); 8232 return 0; 8233 } 8234 8235 if (Scope *S = getScopeForContext(ClassDecl)) 8236 PushOnScopeChains(MoveAssignment, S, false); 8237 ClassDecl->addDecl(MoveAssignment); 8238 8239 AddOverriddenMethods(ClassDecl, MoveAssignment); 8240 return MoveAssignment; 8241} 8242 8243void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8244 CXXMethodDecl *MoveAssignOperator) { 8245 assert((MoveAssignOperator->isDefaulted() && 8246 MoveAssignOperator->isOverloadedOperator() && 8247 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8248 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8249 "DefineImplicitMoveAssignment called for wrong function"); 8250 8251 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8252 8253 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8254 MoveAssignOperator->setInvalidDecl(); 8255 return; 8256 } 8257 8258 MoveAssignOperator->setUsed(); 8259 8260 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8261 DiagnosticErrorTrap Trap(Diags); 8262 8263 // C++0x [class.copy]p28: 8264 // The implicitly-defined or move assignment operator for a non-union class 8265 // X performs memberwise move assignment of its subobjects. The direct base 8266 // classes of X are assigned first, in the order of their declaration in the 8267 // base-specifier-list, and then the immediate non-static data members of X 8268 // are assigned, in the order in which they were declared in the class 8269 // definition. 8270 8271 // The statements that form the synthesized function body. 8272 ASTOwningVector<Stmt*> Statements(*this); 8273 8274 // The parameter for the "other" object, which we are move from. 8275 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8276 QualType OtherRefType = Other->getType()-> 8277 getAs<RValueReferenceType>()->getPointeeType(); 8278 assert(OtherRefType.getQualifiers() == 0 && 8279 "Bad argument type of defaulted move assignment"); 8280 8281 // Our location for everything implicitly-generated. 8282 SourceLocation Loc = MoveAssignOperator->getLocation(); 8283 8284 // Construct a reference to the "other" object. We'll be using this 8285 // throughout the generated ASTs. 8286 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8287 assert(OtherRef && "Reference to parameter cannot fail!"); 8288 // Cast to rvalue. 8289 OtherRef = CastForMoving(*this, OtherRef); 8290 8291 // Construct the "this" pointer. We'll be using this throughout the generated 8292 // ASTs. 8293 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8294 assert(This && "Reference to this cannot fail!"); 8295 8296 // Assign base classes. 8297 bool Invalid = false; 8298 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8299 E = ClassDecl->bases_end(); Base != E; ++Base) { 8300 // Form the assignment: 8301 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8302 QualType BaseType = Base->getType().getUnqualifiedType(); 8303 if (!BaseType->isRecordType()) { 8304 Invalid = true; 8305 continue; 8306 } 8307 8308 CXXCastPath BasePath; 8309 BasePath.push_back(Base); 8310 8311 // Construct the "from" expression, which is an implicit cast to the 8312 // appropriately-qualified base type. 8313 Expr *From = OtherRef; 8314 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8315 VK_XValue, &BasePath).take(); 8316 8317 // Dereference "this". 8318 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8319 8320 // Implicitly cast "this" to the appropriately-qualified base type. 8321 To = ImpCastExprToType(To.take(), 8322 Context.getCVRQualifiedType(BaseType, 8323 MoveAssignOperator->getTypeQualifiers()), 8324 CK_UncheckedDerivedToBase, 8325 VK_LValue, &BasePath); 8326 8327 // Build the move. 8328 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8329 To.get(), From, 8330 /*CopyingBaseSubobject=*/true, 8331 /*Copying=*/false); 8332 if (Move.isInvalid()) { 8333 Diag(CurrentLocation, diag::note_member_synthesized_at) 8334 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8335 MoveAssignOperator->setInvalidDecl(); 8336 return; 8337 } 8338 8339 // Success! Record the move. 8340 Statements.push_back(Move.takeAs<Expr>()); 8341 } 8342 8343 // \brief Reference to the __builtin_memcpy function. 8344 Expr *BuiltinMemCpyRef = 0; 8345 // \brief Reference to the __builtin_objc_memmove_collectable function. 8346 Expr *CollectableMemCpyRef = 0; 8347 8348 // Assign non-static members. 8349 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8350 FieldEnd = ClassDecl->field_end(); 8351 Field != FieldEnd; ++Field) { 8352 // Check for members of reference type; we can't move those. 8353 if (Field->getType()->isReferenceType()) { 8354 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8355 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8356 Diag(Field->getLocation(), diag::note_declared_at); 8357 Diag(CurrentLocation, diag::note_member_synthesized_at) 8358 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8359 Invalid = true; 8360 continue; 8361 } 8362 8363 // Check for members of const-qualified, non-class type. 8364 QualType BaseType = Context.getBaseElementType(Field->getType()); 8365 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8366 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8367 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8368 Diag(Field->getLocation(), diag::note_declared_at); 8369 Diag(CurrentLocation, diag::note_member_synthesized_at) 8370 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8371 Invalid = true; 8372 continue; 8373 } 8374 8375 // Suppress assigning zero-width bitfields. 8376 if (const Expr *Width = Field->getBitWidth()) 8377 if (Width->EvaluateAsInt(Context) == 0) 8378 continue; 8379 8380 QualType FieldType = Field->getType().getNonReferenceType(); 8381 if (FieldType->isIncompleteArrayType()) { 8382 assert(ClassDecl->hasFlexibleArrayMember() && 8383 "Incomplete array type is not valid"); 8384 continue; 8385 } 8386 8387 // Build references to the field in the object we're copying from and to. 8388 CXXScopeSpec SS; // Intentionally empty 8389 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8390 LookupMemberName); 8391 MemberLookup.addDecl(*Field); 8392 MemberLookup.resolveKind(); 8393 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8394 Loc, /*IsArrow=*/false, 8395 SS, 0, MemberLookup, 0); 8396 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8397 Loc, /*IsArrow=*/true, 8398 SS, 0, MemberLookup, 0); 8399 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8400 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8401 8402 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8403 "Member reference with rvalue base must be rvalue except for reference " 8404 "members, which aren't allowed for move assignment."); 8405 8406 // If the field should be copied with __builtin_memcpy rather than via 8407 // explicit assignments, do so. This optimization only applies for arrays 8408 // of scalars and arrays of class type with trivial move-assignment 8409 // operators. 8410 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8411 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8412 // Compute the size of the memory buffer to be copied. 8413 QualType SizeType = Context.getSizeType(); 8414 llvm::APInt Size(Context.getTypeSize(SizeType), 8415 Context.getTypeSizeInChars(BaseType).getQuantity()); 8416 for (const ConstantArrayType *Array 8417 = Context.getAsConstantArrayType(FieldType); 8418 Array; 8419 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8420 llvm::APInt ArraySize 8421 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8422 Size *= ArraySize; 8423 } 8424 8425 // Take the address of the field references for "from" and "to". We 8426 // directly construct UnaryOperators here because semantic analysis 8427 // does not permit us to take the address of an xvalue. 8428 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8429 Context.getPointerType(From.get()->getType()), 8430 VK_RValue, OK_Ordinary, Loc); 8431 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8432 Context.getPointerType(To.get()->getType()), 8433 VK_RValue, OK_Ordinary, Loc); 8434 8435 bool NeedsCollectableMemCpy = 8436 (BaseType->isRecordType() && 8437 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8438 8439 if (NeedsCollectableMemCpy) { 8440 if (!CollectableMemCpyRef) { 8441 // Create a reference to the __builtin_objc_memmove_collectable function. 8442 LookupResult R(*this, 8443 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8444 Loc, LookupOrdinaryName); 8445 LookupName(R, TUScope, true); 8446 8447 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8448 if (!CollectableMemCpy) { 8449 // Something went horribly wrong earlier, and we will have 8450 // complained about it. 8451 Invalid = true; 8452 continue; 8453 } 8454 8455 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8456 CollectableMemCpy->getType(), 8457 VK_LValue, Loc, 0).take(); 8458 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8459 } 8460 } 8461 // Create a reference to the __builtin_memcpy builtin function. 8462 else if (!BuiltinMemCpyRef) { 8463 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8464 LookupOrdinaryName); 8465 LookupName(R, TUScope, true); 8466 8467 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8468 if (!BuiltinMemCpy) { 8469 // Something went horribly wrong earlier, and we will have complained 8470 // about it. 8471 Invalid = true; 8472 continue; 8473 } 8474 8475 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8476 BuiltinMemCpy->getType(), 8477 VK_LValue, Loc, 0).take(); 8478 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8479 } 8480 8481 ASTOwningVector<Expr*> CallArgs(*this); 8482 CallArgs.push_back(To.takeAs<Expr>()); 8483 CallArgs.push_back(From.takeAs<Expr>()); 8484 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8485 ExprResult Call = ExprError(); 8486 if (NeedsCollectableMemCpy) 8487 Call = ActOnCallExpr(/*Scope=*/0, 8488 CollectableMemCpyRef, 8489 Loc, move_arg(CallArgs), 8490 Loc); 8491 else 8492 Call = ActOnCallExpr(/*Scope=*/0, 8493 BuiltinMemCpyRef, 8494 Loc, move_arg(CallArgs), 8495 Loc); 8496 8497 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8498 Statements.push_back(Call.takeAs<Expr>()); 8499 continue; 8500 } 8501 8502 // Build the move of this field. 8503 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8504 To.get(), From.get(), 8505 /*CopyingBaseSubobject=*/false, 8506 /*Copying=*/false); 8507 if (Move.isInvalid()) { 8508 Diag(CurrentLocation, diag::note_member_synthesized_at) 8509 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8510 MoveAssignOperator->setInvalidDecl(); 8511 return; 8512 } 8513 8514 // Success! Record the copy. 8515 Statements.push_back(Move.takeAs<Stmt>()); 8516 } 8517 8518 if (!Invalid) { 8519 // Add a "return *this;" 8520 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8521 8522 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8523 if (Return.isInvalid()) 8524 Invalid = true; 8525 else { 8526 Statements.push_back(Return.takeAs<Stmt>()); 8527 8528 if (Trap.hasErrorOccurred()) { 8529 Diag(CurrentLocation, diag::note_member_synthesized_at) 8530 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8531 Invalid = true; 8532 } 8533 } 8534 } 8535 8536 if (Invalid) { 8537 MoveAssignOperator->setInvalidDecl(); 8538 return; 8539 } 8540 8541 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8542 /*isStmtExpr=*/false); 8543 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8544 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8545 8546 if (ASTMutationListener *L = getASTMutationListener()) { 8547 L->CompletedImplicitDefinition(MoveAssignOperator); 8548 } 8549} 8550 8551std::pair<Sema::ImplicitExceptionSpecification, bool> 8552Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8553 if (ClassDecl->isInvalidDecl()) 8554 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8555 8556 // C++ [class.copy]p5: 8557 // The implicitly-declared copy constructor for a class X will 8558 // have the form 8559 // 8560 // X::X(const X&) 8561 // 8562 // if 8563 // FIXME: It ought to be possible to store this on the record. 8564 bool HasConstCopyConstructor = true; 8565 8566 // -- each direct or virtual base class B of X has a copy 8567 // constructor whose first parameter is of type const B& or 8568 // const volatile B&, and 8569 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8570 BaseEnd = ClassDecl->bases_end(); 8571 HasConstCopyConstructor && Base != BaseEnd; 8572 ++Base) { 8573 // Virtual bases are handled below. 8574 if (Base->isVirtual()) 8575 continue; 8576 8577 CXXRecordDecl *BaseClassDecl 8578 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8579 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8580 &HasConstCopyConstructor); 8581 } 8582 8583 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8584 BaseEnd = ClassDecl->vbases_end(); 8585 HasConstCopyConstructor && Base != BaseEnd; 8586 ++Base) { 8587 CXXRecordDecl *BaseClassDecl 8588 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8589 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8590 &HasConstCopyConstructor); 8591 } 8592 8593 // -- for all the nonstatic data members of X that are of a 8594 // class type M (or array thereof), each such class type 8595 // has a copy constructor whose first parameter is of type 8596 // const M& or const volatile M&. 8597 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8598 FieldEnd = ClassDecl->field_end(); 8599 HasConstCopyConstructor && Field != FieldEnd; 8600 ++Field) { 8601 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8602 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8603 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8604 &HasConstCopyConstructor); 8605 } 8606 } 8607 // Otherwise, the implicitly declared copy constructor will have 8608 // the form 8609 // 8610 // X::X(X&) 8611 8612 // C++ [except.spec]p14: 8613 // An implicitly declared special member function (Clause 12) shall have an 8614 // exception-specification. [...] 8615 ImplicitExceptionSpecification ExceptSpec(Context); 8616 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8617 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8618 BaseEnd = ClassDecl->bases_end(); 8619 Base != BaseEnd; 8620 ++Base) { 8621 // Virtual bases are handled below. 8622 if (Base->isVirtual()) 8623 continue; 8624 8625 CXXRecordDecl *BaseClassDecl 8626 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8627 if (CXXConstructorDecl *CopyConstructor = 8628 LookupCopyingConstructor(BaseClassDecl, Quals)) 8629 ExceptSpec.CalledDecl(CopyConstructor); 8630 } 8631 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8632 BaseEnd = ClassDecl->vbases_end(); 8633 Base != BaseEnd; 8634 ++Base) { 8635 CXXRecordDecl *BaseClassDecl 8636 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8637 if (CXXConstructorDecl *CopyConstructor = 8638 LookupCopyingConstructor(BaseClassDecl, Quals)) 8639 ExceptSpec.CalledDecl(CopyConstructor); 8640 } 8641 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8642 FieldEnd = ClassDecl->field_end(); 8643 Field != FieldEnd; 8644 ++Field) { 8645 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8646 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8647 if (CXXConstructorDecl *CopyConstructor = 8648 LookupCopyingConstructor(FieldClassDecl, Quals)) 8649 ExceptSpec.CalledDecl(CopyConstructor); 8650 } 8651 } 8652 8653 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8654} 8655 8656CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8657 CXXRecordDecl *ClassDecl) { 8658 // C++ [class.copy]p4: 8659 // If the class definition does not explicitly declare a copy 8660 // constructor, one is declared implicitly. 8661 8662 ImplicitExceptionSpecification Spec(Context); 8663 bool Const; 8664 llvm::tie(Spec, Const) = 8665 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8666 8667 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8668 QualType ArgType = ClassType; 8669 if (Const) 8670 ArgType = ArgType.withConst(); 8671 ArgType = Context.getLValueReferenceType(ArgType); 8672 8673 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8674 8675 DeclarationName Name 8676 = Context.DeclarationNames.getCXXConstructorName( 8677 Context.getCanonicalType(ClassType)); 8678 SourceLocation ClassLoc = ClassDecl->getLocation(); 8679 DeclarationNameInfo NameInfo(Name, ClassLoc); 8680 8681 // An implicitly-declared copy constructor is an inline public 8682 // member of its class. 8683 CXXConstructorDecl *CopyConstructor 8684 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8685 Context.getFunctionType(Context.VoidTy, 8686 &ArgType, 1, EPI), 8687 /*TInfo=*/0, 8688 /*isExplicit=*/false, 8689 /*isInline=*/true, 8690 /*isImplicitlyDeclared=*/true, 8691 // FIXME: apply the rules for definitions here 8692 /*isConstexpr=*/false); 8693 CopyConstructor->setAccess(AS_public); 8694 CopyConstructor->setDefaulted(); 8695 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8696 8697 // Note that we have declared this constructor. 8698 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8699 8700 // Add the parameter to the constructor. 8701 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8702 ClassLoc, ClassLoc, 8703 /*IdentifierInfo=*/0, 8704 ArgType, /*TInfo=*/0, 8705 SC_None, 8706 SC_None, 0); 8707 CopyConstructor->setParams(FromParam); 8708 8709 if (Scope *S = getScopeForContext(ClassDecl)) 8710 PushOnScopeChains(CopyConstructor, S, false); 8711 ClassDecl->addDecl(CopyConstructor); 8712 8713 // C++0x [class.copy]p7: 8714 // ... If the class definition declares a move constructor or move 8715 // assignment operator, the implicitly declared constructor is defined as 8716 // deleted; ... 8717 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8718 ClassDecl->hasUserDeclaredMoveAssignment() || 8719 ShouldDeleteCopyConstructor(CopyConstructor)) 8720 CopyConstructor->setDeletedAsWritten(); 8721 8722 return CopyConstructor; 8723} 8724 8725void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8726 CXXConstructorDecl *CopyConstructor) { 8727 assert((CopyConstructor->isDefaulted() && 8728 CopyConstructor->isCopyConstructor() && 8729 !CopyConstructor->doesThisDeclarationHaveABody()) && 8730 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8731 8732 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8733 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8734 8735 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8736 DiagnosticErrorTrap Trap(Diags); 8737 8738 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8739 Trap.hasErrorOccurred()) { 8740 Diag(CurrentLocation, diag::note_member_synthesized_at) 8741 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8742 CopyConstructor->setInvalidDecl(); 8743 } else { 8744 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8745 CopyConstructor->getLocation(), 8746 MultiStmtArg(*this, 0, 0), 8747 /*isStmtExpr=*/false) 8748 .takeAs<Stmt>()); 8749 CopyConstructor->setImplicitlyDefined(true); 8750 } 8751 8752 CopyConstructor->setUsed(); 8753 if (ASTMutationListener *L = getASTMutationListener()) { 8754 L->CompletedImplicitDefinition(CopyConstructor); 8755 } 8756} 8757 8758Sema::ImplicitExceptionSpecification 8759Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8760 // C++ [except.spec]p14: 8761 // An implicitly declared special member function (Clause 12) shall have an 8762 // exception-specification. [...] 8763 ImplicitExceptionSpecification ExceptSpec(Context); 8764 if (ClassDecl->isInvalidDecl()) 8765 return ExceptSpec; 8766 8767 // Direct base-class constructors. 8768 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8769 BEnd = ClassDecl->bases_end(); 8770 B != BEnd; ++B) { 8771 if (B->isVirtual()) // Handled below. 8772 continue; 8773 8774 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8775 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8776 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8777 // If this is a deleted function, add it anyway. This might be conformant 8778 // with the standard. This might not. I'm not sure. It might not matter. 8779 if (Constructor) 8780 ExceptSpec.CalledDecl(Constructor); 8781 } 8782 } 8783 8784 // Virtual base-class constructors. 8785 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8786 BEnd = ClassDecl->vbases_end(); 8787 B != BEnd; ++B) { 8788 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8789 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8790 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8791 // If this is a deleted function, add it anyway. This might be conformant 8792 // with the standard. This might not. I'm not sure. It might not matter. 8793 if (Constructor) 8794 ExceptSpec.CalledDecl(Constructor); 8795 } 8796 } 8797 8798 // Field constructors. 8799 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8800 FEnd = ClassDecl->field_end(); 8801 F != FEnd; ++F) { 8802 if (F->hasInClassInitializer()) { 8803 if (Expr *E = F->getInClassInitializer()) 8804 ExceptSpec.CalledExpr(E); 8805 else if (!F->isInvalidDecl()) 8806 ExceptSpec.SetDelayed(); 8807 } else if (const RecordType *RecordTy 8808 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8809 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8810 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8811 // If this is a deleted function, add it anyway. This might be conformant 8812 // with the standard. This might not. I'm not sure. It might not matter. 8813 // In particular, the problem is that this function never gets called. It 8814 // might just be ill-formed because this function attempts to refer to 8815 // a deleted function here. 8816 if (Constructor) 8817 ExceptSpec.CalledDecl(Constructor); 8818 } 8819 } 8820 8821 return ExceptSpec; 8822} 8823 8824CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8825 CXXRecordDecl *ClassDecl) { 8826 ImplicitExceptionSpecification Spec( 8827 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8828 8829 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8830 QualType ArgType = Context.getRValueReferenceType(ClassType); 8831 8832 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8833 8834 DeclarationName Name 8835 = Context.DeclarationNames.getCXXConstructorName( 8836 Context.getCanonicalType(ClassType)); 8837 SourceLocation ClassLoc = ClassDecl->getLocation(); 8838 DeclarationNameInfo NameInfo(Name, ClassLoc); 8839 8840 // C++0x [class.copy]p11: 8841 // An implicitly-declared copy/move constructor is an inline public 8842 // member of its class. 8843 CXXConstructorDecl *MoveConstructor 8844 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8845 Context.getFunctionType(Context.VoidTy, 8846 &ArgType, 1, EPI), 8847 /*TInfo=*/0, 8848 /*isExplicit=*/false, 8849 /*isInline=*/true, 8850 /*isImplicitlyDeclared=*/true, 8851 // FIXME: apply the rules for definitions here 8852 /*isConstexpr=*/false); 8853 MoveConstructor->setAccess(AS_public); 8854 MoveConstructor->setDefaulted(); 8855 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8856 8857 // Add the parameter to the constructor. 8858 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8859 ClassLoc, ClassLoc, 8860 /*IdentifierInfo=*/0, 8861 ArgType, /*TInfo=*/0, 8862 SC_None, 8863 SC_None, 0); 8864 MoveConstructor->setParams(FromParam); 8865 8866 // C++0x [class.copy]p9: 8867 // If the definition of a class X does not explicitly declare a move 8868 // constructor, one will be implicitly declared as defaulted if and only if: 8869 // [...] 8870 // - the move constructor would not be implicitly defined as deleted. 8871 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8872 // Cache this result so that we don't try to generate this over and over 8873 // on every lookup, leaking memory and wasting time. 8874 ClassDecl->setFailedImplicitMoveConstructor(); 8875 return 0; 8876 } 8877 8878 // Note that we have declared this constructor. 8879 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8880 8881 if (Scope *S = getScopeForContext(ClassDecl)) 8882 PushOnScopeChains(MoveConstructor, S, false); 8883 ClassDecl->addDecl(MoveConstructor); 8884 8885 return MoveConstructor; 8886} 8887 8888void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8889 CXXConstructorDecl *MoveConstructor) { 8890 assert((MoveConstructor->isDefaulted() && 8891 MoveConstructor->isMoveConstructor() && 8892 !MoveConstructor->doesThisDeclarationHaveABody()) && 8893 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8894 8895 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8896 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8897 8898 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8899 DiagnosticErrorTrap Trap(Diags); 8900 8901 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8902 Trap.hasErrorOccurred()) { 8903 Diag(CurrentLocation, diag::note_member_synthesized_at) 8904 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8905 MoveConstructor->setInvalidDecl(); 8906 } else { 8907 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8908 MoveConstructor->getLocation(), 8909 MultiStmtArg(*this, 0, 0), 8910 /*isStmtExpr=*/false) 8911 .takeAs<Stmt>()); 8912 MoveConstructor->setImplicitlyDefined(true); 8913 } 8914 8915 MoveConstructor->setUsed(); 8916 8917 if (ASTMutationListener *L = getASTMutationListener()) { 8918 L->CompletedImplicitDefinition(MoveConstructor); 8919 } 8920} 8921 8922ExprResult 8923Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8924 CXXConstructorDecl *Constructor, 8925 MultiExprArg ExprArgs, 8926 bool HadMultipleCandidates, 8927 bool RequiresZeroInit, 8928 unsigned ConstructKind, 8929 SourceRange ParenRange) { 8930 bool Elidable = false; 8931 8932 // C++0x [class.copy]p34: 8933 // When certain criteria are met, an implementation is allowed to 8934 // omit the copy/move construction of a class object, even if the 8935 // copy/move constructor and/or destructor for the object have 8936 // side effects. [...] 8937 // - when a temporary class object that has not been bound to a 8938 // reference (12.2) would be copied/moved to a class object 8939 // with the same cv-unqualified type, the copy/move operation 8940 // can be omitted by constructing the temporary object 8941 // directly into the target of the omitted copy/move 8942 if (ConstructKind == CXXConstructExpr::CK_Complete && 8943 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8944 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8945 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8946 } 8947 8948 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8949 Elidable, move(ExprArgs), HadMultipleCandidates, 8950 RequiresZeroInit, ConstructKind, ParenRange); 8951} 8952 8953/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8954/// including handling of its default argument expressions. 8955ExprResult 8956Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8957 CXXConstructorDecl *Constructor, bool Elidable, 8958 MultiExprArg ExprArgs, 8959 bool HadMultipleCandidates, 8960 bool RequiresZeroInit, 8961 unsigned ConstructKind, 8962 SourceRange ParenRange) { 8963 unsigned NumExprs = ExprArgs.size(); 8964 Expr **Exprs = (Expr **)ExprArgs.release(); 8965 8966 for (specific_attr_iterator<NonNullAttr> 8967 i = Constructor->specific_attr_begin<NonNullAttr>(), 8968 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8969 const NonNullAttr *NonNull = *i; 8970 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8971 } 8972 8973 MarkDeclarationReferenced(ConstructLoc, Constructor); 8974 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8975 Constructor, Elidable, Exprs, NumExprs, 8976 HadMultipleCandidates, RequiresZeroInit, 8977 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8978 ParenRange)); 8979} 8980 8981bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8982 CXXConstructorDecl *Constructor, 8983 MultiExprArg Exprs, 8984 bool HadMultipleCandidates) { 8985 // FIXME: Provide the correct paren SourceRange when available. 8986 ExprResult TempResult = 8987 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8988 move(Exprs), HadMultipleCandidates, false, 8989 CXXConstructExpr::CK_Complete, SourceRange()); 8990 if (TempResult.isInvalid()) 8991 return true; 8992 8993 Expr *Temp = TempResult.takeAs<Expr>(); 8994 CheckImplicitConversions(Temp, VD->getLocation()); 8995 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8996 Temp = MaybeCreateExprWithCleanups(Temp); 8997 VD->setInit(Temp); 8998 8999 return false; 9000} 9001 9002void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9003 if (VD->isInvalidDecl()) return; 9004 9005 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9006 if (ClassDecl->isInvalidDecl()) return; 9007 if (ClassDecl->hasTrivialDestructor()) return; 9008 if (ClassDecl->isDependentContext()) return; 9009 9010 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9011 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9012 CheckDestructorAccess(VD->getLocation(), Destructor, 9013 PDiag(diag::err_access_dtor_var) 9014 << VD->getDeclName() 9015 << VD->getType()); 9016 9017 if (!VD->hasGlobalStorage()) return; 9018 9019 // Emit warning for non-trivial dtor in global scope (a real global, 9020 // class-static, function-static). 9021 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9022 9023 // TODO: this should be re-enabled for static locals by !CXAAtExit 9024 if (!VD->isStaticLocal()) 9025 Diag(VD->getLocation(), diag::warn_global_destructor); 9026} 9027 9028/// AddCXXDirectInitializerToDecl - This action is called immediately after 9029/// ActOnDeclarator, when a C++ direct initializer is present. 9030/// e.g: "int x(1);" 9031void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9032 SourceLocation LParenLoc, 9033 MultiExprArg Exprs, 9034 SourceLocation RParenLoc, 9035 bool TypeMayContainAuto) { 9036 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 9037 9038 // If there is no declaration, there was an error parsing it. Just ignore 9039 // the initializer. 9040 if (RealDecl == 0) 9041 return; 9042 9043 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9044 if (!VDecl) { 9045 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9046 RealDecl->setInvalidDecl(); 9047 return; 9048 } 9049 9050 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9051 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9052 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 9053 if (Exprs.size() > 1) { 9054 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9055 diag::err_auto_var_init_multiple_expressions) 9056 << VDecl->getDeclName() << VDecl->getType() 9057 << VDecl->getSourceRange(); 9058 RealDecl->setInvalidDecl(); 9059 return; 9060 } 9061 9062 Expr *Init = Exprs.get()[0]; 9063 TypeSourceInfo *DeducedType = 0; 9064 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 9065 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 9066 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 9067 << Init->getSourceRange(); 9068 if (!DeducedType) { 9069 RealDecl->setInvalidDecl(); 9070 return; 9071 } 9072 VDecl->setTypeSourceInfo(DeducedType); 9073 VDecl->setType(DeducedType->getType()); 9074 9075 // In ARC, infer lifetime. 9076 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9077 VDecl->setInvalidDecl(); 9078 9079 // If this is a redeclaration, check that the type we just deduced matches 9080 // the previously declared type. 9081 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 9082 MergeVarDeclTypes(VDecl, Old); 9083 } 9084 9085 // We will represent direct-initialization similarly to copy-initialization: 9086 // int x(1); -as-> int x = 1; 9087 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9088 // 9089 // Clients that want to distinguish between the two forms, can check for 9090 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9091 // A major benefit is that clients that don't particularly care about which 9092 // exactly form was it (like the CodeGen) can handle both cases without 9093 // special case code. 9094 9095 // C++ 8.5p11: 9096 // The form of initialization (using parentheses or '=') is generally 9097 // insignificant, but does matter when the entity being initialized has a 9098 // class type. 9099 9100 if (!VDecl->getType()->isDependentType() && 9101 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9102 diag::err_typecheck_decl_incomplete_type)) { 9103 VDecl->setInvalidDecl(); 9104 return; 9105 } 9106 9107 // The variable can not have an abstract class type. 9108 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9109 diag::err_abstract_type_in_decl, 9110 AbstractVariableType)) 9111 VDecl->setInvalidDecl(); 9112 9113 const VarDecl *Def; 9114 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9115 Diag(VDecl->getLocation(), diag::err_redefinition) 9116 << VDecl->getDeclName(); 9117 Diag(Def->getLocation(), diag::note_previous_definition); 9118 VDecl->setInvalidDecl(); 9119 return; 9120 } 9121 9122 // C++ [class.static.data]p4 9123 // If a static data member is of const integral or const 9124 // enumeration type, its declaration in the class definition can 9125 // specify a constant-initializer which shall be an integral 9126 // constant expression (5.19). In that case, the member can appear 9127 // in integral constant expressions. The member shall still be 9128 // defined in a namespace scope if it is used in the program and the 9129 // namespace scope definition shall not contain an initializer. 9130 // 9131 // We already performed a redefinition check above, but for static 9132 // data members we also need to check whether there was an in-class 9133 // declaration with an initializer. 9134 const VarDecl* PrevInit = 0; 9135 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9136 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9137 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9138 return; 9139 } 9140 9141 bool IsDependent = false; 9142 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9143 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9144 VDecl->setInvalidDecl(); 9145 return; 9146 } 9147 9148 if (Exprs.get()[I]->isTypeDependent()) 9149 IsDependent = true; 9150 } 9151 9152 // If either the declaration has a dependent type or if any of the 9153 // expressions is type-dependent, we represent the initialization 9154 // via a ParenListExpr for later use during template instantiation. 9155 if (VDecl->getType()->isDependentType() || IsDependent) { 9156 // Let clients know that initialization was done with a direct initializer. 9157 VDecl->setCXXDirectInitializer(true); 9158 9159 // Store the initialization expressions as a ParenListExpr. 9160 unsigned NumExprs = Exprs.size(); 9161 VDecl->setInit(new (Context) ParenListExpr( 9162 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9163 VDecl->getType().getNonReferenceType())); 9164 return; 9165 } 9166 9167 // Capture the variable that is being initialized and the style of 9168 // initialization. 9169 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9170 9171 // FIXME: Poor source location information. 9172 InitializationKind Kind 9173 = InitializationKind::CreateDirect(VDecl->getLocation(), 9174 LParenLoc, RParenLoc); 9175 9176 InitializationSequence InitSeq(*this, Entity, Kind, 9177 Exprs.get(), Exprs.size()); 9178 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 9179 if (Result.isInvalid()) { 9180 VDecl->setInvalidDecl(); 9181 return; 9182 } 9183 9184 Expr *Init = Result.get(); 9185 CheckImplicitConversions(Init, LParenLoc); 9186 9187 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 9188 !Init->isValueDependent() && 9189 !Init->isConstantInitializer(Context, 9190 VDecl->getType()->isReferenceType())) { 9191 // FIXME: Improve this diagnostic to explain why the initializer is not 9192 // a constant expression. 9193 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 9194 << VDecl << Init->getSourceRange(); 9195 } 9196 9197 Init = MaybeCreateExprWithCleanups(Init); 9198 VDecl->setInit(Init); 9199 VDecl->setCXXDirectInitializer(true); 9200 9201 CheckCompleteVariableDeclaration(VDecl); 9202} 9203 9204/// \brief Given a constructor and the set of arguments provided for the 9205/// constructor, convert the arguments and add any required default arguments 9206/// to form a proper call to this constructor. 9207/// 9208/// \returns true if an error occurred, false otherwise. 9209bool 9210Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9211 MultiExprArg ArgsPtr, 9212 SourceLocation Loc, 9213 ASTOwningVector<Expr*> &ConvertedArgs) { 9214 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9215 unsigned NumArgs = ArgsPtr.size(); 9216 Expr **Args = (Expr **)ArgsPtr.get(); 9217 9218 const FunctionProtoType *Proto 9219 = Constructor->getType()->getAs<FunctionProtoType>(); 9220 assert(Proto && "Constructor without a prototype?"); 9221 unsigned NumArgsInProto = Proto->getNumArgs(); 9222 9223 // If too few arguments are available, we'll fill in the rest with defaults. 9224 if (NumArgs < NumArgsInProto) 9225 ConvertedArgs.reserve(NumArgsInProto); 9226 else 9227 ConvertedArgs.reserve(NumArgs); 9228 9229 VariadicCallType CallType = 9230 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9231 SmallVector<Expr *, 8> AllArgs; 9232 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9233 Proto, 0, Args, NumArgs, AllArgs, 9234 CallType); 9235 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9236 ConvertedArgs.push_back(AllArgs[i]); 9237 return Invalid; 9238} 9239 9240static inline bool 9241CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9242 const FunctionDecl *FnDecl) { 9243 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9244 if (isa<NamespaceDecl>(DC)) { 9245 return SemaRef.Diag(FnDecl->getLocation(), 9246 diag::err_operator_new_delete_declared_in_namespace) 9247 << FnDecl->getDeclName(); 9248 } 9249 9250 if (isa<TranslationUnitDecl>(DC) && 9251 FnDecl->getStorageClass() == SC_Static) { 9252 return SemaRef.Diag(FnDecl->getLocation(), 9253 diag::err_operator_new_delete_declared_static) 9254 << FnDecl->getDeclName(); 9255 } 9256 9257 return false; 9258} 9259 9260static inline bool 9261CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9262 CanQualType ExpectedResultType, 9263 CanQualType ExpectedFirstParamType, 9264 unsigned DependentParamTypeDiag, 9265 unsigned InvalidParamTypeDiag) { 9266 QualType ResultType = 9267 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9268 9269 // Check that the result type is not dependent. 9270 if (ResultType->isDependentType()) 9271 return SemaRef.Diag(FnDecl->getLocation(), 9272 diag::err_operator_new_delete_dependent_result_type) 9273 << FnDecl->getDeclName() << ExpectedResultType; 9274 9275 // Check that the result type is what we expect. 9276 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9277 return SemaRef.Diag(FnDecl->getLocation(), 9278 diag::err_operator_new_delete_invalid_result_type) 9279 << FnDecl->getDeclName() << ExpectedResultType; 9280 9281 // A function template must have at least 2 parameters. 9282 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9283 return SemaRef.Diag(FnDecl->getLocation(), 9284 diag::err_operator_new_delete_template_too_few_parameters) 9285 << FnDecl->getDeclName(); 9286 9287 // The function decl must have at least 1 parameter. 9288 if (FnDecl->getNumParams() == 0) 9289 return SemaRef.Diag(FnDecl->getLocation(), 9290 diag::err_operator_new_delete_too_few_parameters) 9291 << FnDecl->getDeclName(); 9292 9293 // Check the the first parameter type is not dependent. 9294 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9295 if (FirstParamType->isDependentType()) 9296 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9297 << FnDecl->getDeclName() << ExpectedFirstParamType; 9298 9299 // Check that the first parameter type is what we expect. 9300 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9301 ExpectedFirstParamType) 9302 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9303 << FnDecl->getDeclName() << ExpectedFirstParamType; 9304 9305 return false; 9306} 9307 9308static bool 9309CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9310 // C++ [basic.stc.dynamic.allocation]p1: 9311 // A program is ill-formed if an allocation function is declared in a 9312 // namespace scope other than global scope or declared static in global 9313 // scope. 9314 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9315 return true; 9316 9317 CanQualType SizeTy = 9318 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9319 9320 // C++ [basic.stc.dynamic.allocation]p1: 9321 // The return type shall be void*. The first parameter shall have type 9322 // std::size_t. 9323 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9324 SizeTy, 9325 diag::err_operator_new_dependent_param_type, 9326 diag::err_operator_new_param_type)) 9327 return true; 9328 9329 // C++ [basic.stc.dynamic.allocation]p1: 9330 // The first parameter shall not have an associated default argument. 9331 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9332 return SemaRef.Diag(FnDecl->getLocation(), 9333 diag::err_operator_new_default_arg) 9334 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9335 9336 return false; 9337} 9338 9339static bool 9340CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9341 // C++ [basic.stc.dynamic.deallocation]p1: 9342 // A program is ill-formed if deallocation functions are declared in a 9343 // namespace scope other than global scope or declared static in global 9344 // scope. 9345 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9346 return true; 9347 9348 // C++ [basic.stc.dynamic.deallocation]p2: 9349 // Each deallocation function shall return void and its first parameter 9350 // shall be void*. 9351 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9352 SemaRef.Context.VoidPtrTy, 9353 diag::err_operator_delete_dependent_param_type, 9354 diag::err_operator_delete_param_type)) 9355 return true; 9356 9357 return false; 9358} 9359 9360/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9361/// of this overloaded operator is well-formed. If so, returns false; 9362/// otherwise, emits appropriate diagnostics and returns true. 9363bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9364 assert(FnDecl && FnDecl->isOverloadedOperator() && 9365 "Expected an overloaded operator declaration"); 9366 9367 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9368 9369 // C++ [over.oper]p5: 9370 // The allocation and deallocation functions, operator new, 9371 // operator new[], operator delete and operator delete[], are 9372 // described completely in 3.7.3. The attributes and restrictions 9373 // found in the rest of this subclause do not apply to them unless 9374 // explicitly stated in 3.7.3. 9375 if (Op == OO_Delete || Op == OO_Array_Delete) 9376 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9377 9378 if (Op == OO_New || Op == OO_Array_New) 9379 return CheckOperatorNewDeclaration(*this, FnDecl); 9380 9381 // C++ [over.oper]p6: 9382 // An operator function shall either be a non-static member 9383 // function or be a non-member function and have at least one 9384 // parameter whose type is a class, a reference to a class, an 9385 // enumeration, or a reference to an enumeration. 9386 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9387 if (MethodDecl->isStatic()) 9388 return Diag(FnDecl->getLocation(), 9389 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9390 } else { 9391 bool ClassOrEnumParam = false; 9392 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9393 ParamEnd = FnDecl->param_end(); 9394 Param != ParamEnd; ++Param) { 9395 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9396 if (ParamType->isDependentType() || ParamType->isRecordType() || 9397 ParamType->isEnumeralType()) { 9398 ClassOrEnumParam = true; 9399 break; 9400 } 9401 } 9402 9403 if (!ClassOrEnumParam) 9404 return Diag(FnDecl->getLocation(), 9405 diag::err_operator_overload_needs_class_or_enum) 9406 << FnDecl->getDeclName(); 9407 } 9408 9409 // C++ [over.oper]p8: 9410 // An operator function cannot have default arguments (8.3.6), 9411 // except where explicitly stated below. 9412 // 9413 // Only the function-call operator allows default arguments 9414 // (C++ [over.call]p1). 9415 if (Op != OO_Call) { 9416 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9417 Param != FnDecl->param_end(); ++Param) { 9418 if ((*Param)->hasDefaultArg()) 9419 return Diag((*Param)->getLocation(), 9420 diag::err_operator_overload_default_arg) 9421 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9422 } 9423 } 9424 9425 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9426 { false, false, false } 9427#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9428 , { Unary, Binary, MemberOnly } 9429#include "clang/Basic/OperatorKinds.def" 9430 }; 9431 9432 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9433 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9434 bool MustBeMemberOperator = OperatorUses[Op][2]; 9435 9436 // C++ [over.oper]p8: 9437 // [...] Operator functions cannot have more or fewer parameters 9438 // than the number required for the corresponding operator, as 9439 // described in the rest of this subclause. 9440 unsigned NumParams = FnDecl->getNumParams() 9441 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9442 if (Op != OO_Call && 9443 ((NumParams == 1 && !CanBeUnaryOperator) || 9444 (NumParams == 2 && !CanBeBinaryOperator) || 9445 (NumParams < 1) || (NumParams > 2))) { 9446 // We have the wrong number of parameters. 9447 unsigned ErrorKind; 9448 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9449 ErrorKind = 2; // 2 -> unary or binary. 9450 } else if (CanBeUnaryOperator) { 9451 ErrorKind = 0; // 0 -> unary 9452 } else { 9453 assert(CanBeBinaryOperator && 9454 "All non-call overloaded operators are unary or binary!"); 9455 ErrorKind = 1; // 1 -> binary 9456 } 9457 9458 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9459 << FnDecl->getDeclName() << NumParams << ErrorKind; 9460 } 9461 9462 // Overloaded operators other than operator() cannot be variadic. 9463 if (Op != OO_Call && 9464 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9465 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9466 << FnDecl->getDeclName(); 9467 } 9468 9469 // Some operators must be non-static member functions. 9470 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9471 return Diag(FnDecl->getLocation(), 9472 diag::err_operator_overload_must_be_member) 9473 << FnDecl->getDeclName(); 9474 } 9475 9476 // C++ [over.inc]p1: 9477 // The user-defined function called operator++ implements the 9478 // prefix and postfix ++ operator. If this function is a member 9479 // function with no parameters, or a non-member function with one 9480 // parameter of class or enumeration type, it defines the prefix 9481 // increment operator ++ for objects of that type. If the function 9482 // is a member function with one parameter (which shall be of type 9483 // int) or a non-member function with two parameters (the second 9484 // of which shall be of type int), it defines the postfix 9485 // increment operator ++ for objects of that type. 9486 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9487 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9488 bool ParamIsInt = false; 9489 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9490 ParamIsInt = BT->getKind() == BuiltinType::Int; 9491 9492 if (!ParamIsInt) 9493 return Diag(LastParam->getLocation(), 9494 diag::err_operator_overload_post_incdec_must_be_int) 9495 << LastParam->getType() << (Op == OO_MinusMinus); 9496 } 9497 9498 return false; 9499} 9500 9501/// CheckLiteralOperatorDeclaration - Check whether the declaration 9502/// of this literal operator function is well-formed. If so, returns 9503/// false; otherwise, emits appropriate diagnostics and returns true. 9504bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9505 DeclContext *DC = FnDecl->getDeclContext(); 9506 Decl::Kind Kind = DC->getDeclKind(); 9507 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9508 Kind != Decl::LinkageSpec) { 9509 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9510 << FnDecl->getDeclName(); 9511 return true; 9512 } 9513 9514 bool Valid = false; 9515 9516 // template <char...> type operator "" name() is the only valid template 9517 // signature, and the only valid signature with no parameters. 9518 if (FnDecl->param_size() == 0) { 9519 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9520 // Must have only one template parameter 9521 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9522 if (Params->size() == 1) { 9523 NonTypeTemplateParmDecl *PmDecl = 9524 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9525 9526 // The template parameter must be a char parameter pack. 9527 if (PmDecl && PmDecl->isTemplateParameterPack() && 9528 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9529 Valid = true; 9530 } 9531 } 9532 } else { 9533 // Check the first parameter 9534 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9535 9536 QualType T = (*Param)->getType(); 9537 9538 // unsigned long long int, long double, and any character type are allowed 9539 // as the only parameters. 9540 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9541 Context.hasSameType(T, Context.LongDoubleTy) || 9542 Context.hasSameType(T, Context.CharTy) || 9543 Context.hasSameType(T, Context.WCharTy) || 9544 Context.hasSameType(T, Context.Char16Ty) || 9545 Context.hasSameType(T, Context.Char32Ty)) { 9546 if (++Param == FnDecl->param_end()) 9547 Valid = true; 9548 goto FinishedParams; 9549 } 9550 9551 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9552 const PointerType *PT = T->getAs<PointerType>(); 9553 if (!PT) 9554 goto FinishedParams; 9555 T = PT->getPointeeType(); 9556 if (!T.isConstQualified()) 9557 goto FinishedParams; 9558 T = T.getUnqualifiedType(); 9559 9560 // Move on to the second parameter; 9561 ++Param; 9562 9563 // If there is no second parameter, the first must be a const char * 9564 if (Param == FnDecl->param_end()) { 9565 if (Context.hasSameType(T, Context.CharTy)) 9566 Valid = true; 9567 goto FinishedParams; 9568 } 9569 9570 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9571 // are allowed as the first parameter to a two-parameter function 9572 if (!(Context.hasSameType(T, Context.CharTy) || 9573 Context.hasSameType(T, Context.WCharTy) || 9574 Context.hasSameType(T, Context.Char16Ty) || 9575 Context.hasSameType(T, Context.Char32Ty))) 9576 goto FinishedParams; 9577 9578 // The second and final parameter must be an std::size_t 9579 T = (*Param)->getType().getUnqualifiedType(); 9580 if (Context.hasSameType(T, Context.getSizeType()) && 9581 ++Param == FnDecl->param_end()) 9582 Valid = true; 9583 } 9584 9585 // FIXME: This diagnostic is absolutely terrible. 9586FinishedParams: 9587 if (!Valid) { 9588 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9589 << FnDecl->getDeclName(); 9590 return true; 9591 } 9592 9593 StringRef LiteralName 9594 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9595 if (LiteralName[0] != '_') { 9596 // C++0x [usrlit.suffix]p1: 9597 // Literal suffix identifiers that do not start with an underscore are 9598 // reserved for future standardization. 9599 bool IsHexFloat = true; 9600 if (LiteralName.size() > 1 && 9601 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9602 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9603 if (!isdigit(LiteralName[I])) { 9604 IsHexFloat = false; 9605 break; 9606 } 9607 } 9608 } 9609 9610 if (IsHexFloat) 9611 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9612 << LiteralName; 9613 else 9614 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9615 } 9616 9617 return false; 9618} 9619 9620/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9621/// linkage specification, including the language and (if present) 9622/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9623/// the location of the language string literal, which is provided 9624/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9625/// the '{' brace. Otherwise, this linkage specification does not 9626/// have any braces. 9627Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9628 SourceLocation LangLoc, 9629 StringRef Lang, 9630 SourceLocation LBraceLoc) { 9631 LinkageSpecDecl::LanguageIDs Language; 9632 if (Lang == "\"C\"") 9633 Language = LinkageSpecDecl::lang_c; 9634 else if (Lang == "\"C++\"") 9635 Language = LinkageSpecDecl::lang_cxx; 9636 else { 9637 Diag(LangLoc, diag::err_bad_language); 9638 return 0; 9639 } 9640 9641 // FIXME: Add all the various semantics of linkage specifications 9642 9643 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9644 ExternLoc, LangLoc, Language); 9645 CurContext->addDecl(D); 9646 PushDeclContext(S, D); 9647 return D; 9648} 9649 9650/// ActOnFinishLinkageSpecification - Complete the definition of 9651/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9652/// valid, it's the position of the closing '}' brace in a linkage 9653/// specification that uses braces. 9654Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9655 Decl *LinkageSpec, 9656 SourceLocation RBraceLoc) { 9657 if (LinkageSpec) { 9658 if (RBraceLoc.isValid()) { 9659 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9660 LSDecl->setRBraceLoc(RBraceLoc); 9661 } 9662 PopDeclContext(); 9663 } 9664 return LinkageSpec; 9665} 9666 9667/// \brief Perform semantic analysis for the variable declaration that 9668/// occurs within a C++ catch clause, returning the newly-created 9669/// variable. 9670VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9671 TypeSourceInfo *TInfo, 9672 SourceLocation StartLoc, 9673 SourceLocation Loc, 9674 IdentifierInfo *Name) { 9675 bool Invalid = false; 9676 QualType ExDeclType = TInfo->getType(); 9677 9678 // Arrays and functions decay. 9679 if (ExDeclType->isArrayType()) 9680 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9681 else if (ExDeclType->isFunctionType()) 9682 ExDeclType = Context.getPointerType(ExDeclType); 9683 9684 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9685 // The exception-declaration shall not denote a pointer or reference to an 9686 // incomplete type, other than [cv] void*. 9687 // N2844 forbids rvalue references. 9688 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9689 Diag(Loc, diag::err_catch_rvalue_ref); 9690 Invalid = true; 9691 } 9692 9693 // GCC allows catching pointers and references to incomplete types 9694 // as an extension; so do we, but we warn by default. 9695 9696 QualType BaseType = ExDeclType; 9697 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9698 unsigned DK = diag::err_catch_incomplete; 9699 bool IncompleteCatchIsInvalid = true; 9700 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9701 BaseType = Ptr->getPointeeType(); 9702 Mode = 1; 9703 DK = diag::ext_catch_incomplete_ptr; 9704 IncompleteCatchIsInvalid = false; 9705 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9706 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9707 BaseType = Ref->getPointeeType(); 9708 Mode = 2; 9709 DK = diag::ext_catch_incomplete_ref; 9710 IncompleteCatchIsInvalid = false; 9711 } 9712 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9713 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9714 IncompleteCatchIsInvalid) 9715 Invalid = true; 9716 9717 if (!Invalid && !ExDeclType->isDependentType() && 9718 RequireNonAbstractType(Loc, ExDeclType, 9719 diag::err_abstract_type_in_decl, 9720 AbstractVariableType)) 9721 Invalid = true; 9722 9723 // Only the non-fragile NeXT runtime currently supports C++ catches 9724 // of ObjC types, and no runtime supports catching ObjC types by value. 9725 if (!Invalid && getLangOptions().ObjC1) { 9726 QualType T = ExDeclType; 9727 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9728 T = RT->getPointeeType(); 9729 9730 if (T->isObjCObjectType()) { 9731 Diag(Loc, diag::err_objc_object_catch); 9732 Invalid = true; 9733 } else if (T->isObjCObjectPointerType()) { 9734 if (!getLangOptions().ObjCNonFragileABI) 9735 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9736 } 9737 } 9738 9739 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9740 ExDeclType, TInfo, SC_None, SC_None); 9741 ExDecl->setExceptionVariable(true); 9742 9743 if (!Invalid && !ExDeclType->isDependentType()) { 9744 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9745 // C++ [except.handle]p16: 9746 // The object declared in an exception-declaration or, if the 9747 // exception-declaration does not specify a name, a temporary (12.2) is 9748 // copy-initialized (8.5) from the exception object. [...] 9749 // The object is destroyed when the handler exits, after the destruction 9750 // of any automatic objects initialized within the handler. 9751 // 9752 // We just pretend to initialize the object with itself, then make sure 9753 // it can be destroyed later. 9754 QualType initType = ExDeclType; 9755 9756 InitializedEntity entity = 9757 InitializedEntity::InitializeVariable(ExDecl); 9758 InitializationKind initKind = 9759 InitializationKind::CreateCopy(Loc, SourceLocation()); 9760 9761 Expr *opaqueValue = 9762 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9763 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9764 ExprResult result = sequence.Perform(*this, entity, initKind, 9765 MultiExprArg(&opaqueValue, 1)); 9766 if (result.isInvalid()) 9767 Invalid = true; 9768 else { 9769 // If the constructor used was non-trivial, set this as the 9770 // "initializer". 9771 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9772 if (!construct->getConstructor()->isTrivial()) { 9773 Expr *init = MaybeCreateExprWithCleanups(construct); 9774 ExDecl->setInit(init); 9775 } 9776 9777 // And make sure it's destructable. 9778 FinalizeVarWithDestructor(ExDecl, recordType); 9779 } 9780 } 9781 } 9782 9783 if (Invalid) 9784 ExDecl->setInvalidDecl(); 9785 9786 return ExDecl; 9787} 9788 9789/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9790/// handler. 9791Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9792 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9793 bool Invalid = D.isInvalidType(); 9794 9795 // Check for unexpanded parameter packs. 9796 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9797 UPPC_ExceptionType)) { 9798 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9799 D.getIdentifierLoc()); 9800 Invalid = true; 9801 } 9802 9803 IdentifierInfo *II = D.getIdentifier(); 9804 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9805 LookupOrdinaryName, 9806 ForRedeclaration)) { 9807 // The scope should be freshly made just for us. There is just no way 9808 // it contains any previous declaration. 9809 assert(!S->isDeclScope(PrevDecl)); 9810 if (PrevDecl->isTemplateParameter()) { 9811 // Maybe we will complain about the shadowed template parameter. 9812 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9813 } 9814 } 9815 9816 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9817 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9818 << D.getCXXScopeSpec().getRange(); 9819 Invalid = true; 9820 } 9821 9822 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9823 D.getSourceRange().getBegin(), 9824 D.getIdentifierLoc(), 9825 D.getIdentifier()); 9826 if (Invalid) 9827 ExDecl->setInvalidDecl(); 9828 9829 // Add the exception declaration into this scope. 9830 if (II) 9831 PushOnScopeChains(ExDecl, S); 9832 else 9833 CurContext->addDecl(ExDecl); 9834 9835 ProcessDeclAttributes(S, ExDecl, D); 9836 return ExDecl; 9837} 9838 9839Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9840 Expr *AssertExpr, 9841 Expr *AssertMessageExpr_, 9842 SourceLocation RParenLoc) { 9843 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9844 9845 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9846 llvm::APSInt Value(32); 9847 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9848 Diag(StaticAssertLoc, 9849 diag::err_static_assert_expression_is_not_constant) << 9850 AssertExpr->getSourceRange(); 9851 return 0; 9852 } 9853 9854 if (Value == 0) { 9855 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9856 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9857 } 9858 } 9859 9860 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9861 return 0; 9862 9863 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9864 AssertExpr, AssertMessage, RParenLoc); 9865 9866 CurContext->addDecl(Decl); 9867 return Decl; 9868} 9869 9870/// \brief Perform semantic analysis of the given friend type declaration. 9871/// 9872/// \returns A friend declaration that. 9873FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9874 TypeSourceInfo *TSInfo) { 9875 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9876 9877 QualType T = TSInfo->getType(); 9878 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9879 9880 if (!getLangOptions().CPlusPlus0x) { 9881 // C++03 [class.friend]p2: 9882 // An elaborated-type-specifier shall be used in a friend declaration 9883 // for a class.* 9884 // 9885 // * The class-key of the elaborated-type-specifier is required. 9886 if (!ActiveTemplateInstantiations.empty()) { 9887 // Do not complain about the form of friend template types during 9888 // template instantiation; we will already have complained when the 9889 // template was declared. 9890 } else if (!T->isElaboratedTypeSpecifier()) { 9891 // If we evaluated the type to a record type, suggest putting 9892 // a tag in front. 9893 if (const RecordType *RT = T->getAs<RecordType>()) { 9894 RecordDecl *RD = RT->getDecl(); 9895 9896 std::string InsertionText = std::string(" ") + RD->getKindName(); 9897 9898 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9899 << (unsigned) RD->getTagKind() 9900 << T 9901 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9902 InsertionText); 9903 } else { 9904 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9905 << T 9906 << SourceRange(FriendLoc, TypeRange.getEnd()); 9907 } 9908 } else if (T->getAs<EnumType>()) { 9909 Diag(FriendLoc, diag::ext_enum_friend) 9910 << T 9911 << SourceRange(FriendLoc, TypeRange.getEnd()); 9912 } 9913 } 9914 9915 // C++0x [class.friend]p3: 9916 // If the type specifier in a friend declaration designates a (possibly 9917 // cv-qualified) class type, that class is declared as a friend; otherwise, 9918 // the friend declaration is ignored. 9919 9920 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9921 // in [class.friend]p3 that we do not implement. 9922 9923 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9924} 9925 9926/// Handle a friend tag declaration where the scope specifier was 9927/// templated. 9928Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9929 unsigned TagSpec, SourceLocation TagLoc, 9930 CXXScopeSpec &SS, 9931 IdentifierInfo *Name, SourceLocation NameLoc, 9932 AttributeList *Attr, 9933 MultiTemplateParamsArg TempParamLists) { 9934 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9935 9936 bool isExplicitSpecialization = false; 9937 bool Invalid = false; 9938 9939 if (TemplateParameterList *TemplateParams 9940 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9941 TempParamLists.get(), 9942 TempParamLists.size(), 9943 /*friend*/ true, 9944 isExplicitSpecialization, 9945 Invalid)) { 9946 if (TemplateParams->size() > 0) { 9947 // This is a declaration of a class template. 9948 if (Invalid) 9949 return 0; 9950 9951 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9952 SS, Name, NameLoc, Attr, 9953 TemplateParams, AS_public, 9954 /*ModulePrivateLoc=*/SourceLocation(), 9955 TempParamLists.size() - 1, 9956 (TemplateParameterList**) TempParamLists.release()).take(); 9957 } else { 9958 // The "template<>" header is extraneous. 9959 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9960 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9961 isExplicitSpecialization = true; 9962 } 9963 } 9964 9965 if (Invalid) return 0; 9966 9967 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9968 9969 bool isAllExplicitSpecializations = true; 9970 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9971 if (TempParamLists.get()[I]->size()) { 9972 isAllExplicitSpecializations = false; 9973 break; 9974 } 9975 } 9976 9977 // FIXME: don't ignore attributes. 9978 9979 // If it's explicit specializations all the way down, just forget 9980 // about the template header and build an appropriate non-templated 9981 // friend. TODO: for source fidelity, remember the headers. 9982 if (isAllExplicitSpecializations) { 9983 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9984 ElaboratedTypeKeyword Keyword 9985 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9986 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9987 *Name, NameLoc); 9988 if (T.isNull()) 9989 return 0; 9990 9991 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9992 if (isa<DependentNameType>(T)) { 9993 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9994 TL.setKeywordLoc(TagLoc); 9995 TL.setQualifierLoc(QualifierLoc); 9996 TL.setNameLoc(NameLoc); 9997 } else { 9998 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9999 TL.setKeywordLoc(TagLoc); 10000 TL.setQualifierLoc(QualifierLoc); 10001 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10002 } 10003 10004 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10005 TSI, FriendLoc); 10006 Friend->setAccess(AS_public); 10007 CurContext->addDecl(Friend); 10008 return Friend; 10009 } 10010 10011 // Handle the case of a templated-scope friend class. e.g. 10012 // template <class T> class A<T>::B; 10013 // FIXME: we don't support these right now. 10014 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10015 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10016 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10017 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10018 TL.setKeywordLoc(TagLoc); 10019 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10020 TL.setNameLoc(NameLoc); 10021 10022 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10023 TSI, FriendLoc); 10024 Friend->setAccess(AS_public); 10025 Friend->setUnsupportedFriend(true); 10026 CurContext->addDecl(Friend); 10027 return Friend; 10028} 10029 10030 10031/// Handle a friend type declaration. This works in tandem with 10032/// ActOnTag. 10033/// 10034/// Notes on friend class templates: 10035/// 10036/// We generally treat friend class declarations as if they were 10037/// declaring a class. So, for example, the elaborated type specifier 10038/// in a friend declaration is required to obey the restrictions of a 10039/// class-head (i.e. no typedefs in the scope chain), template 10040/// parameters are required to match up with simple template-ids, &c. 10041/// However, unlike when declaring a template specialization, it's 10042/// okay to refer to a template specialization without an empty 10043/// template parameter declaration, e.g. 10044/// friend class A<T>::B<unsigned>; 10045/// We permit this as a special case; if there are any template 10046/// parameters present at all, require proper matching, i.e. 10047/// template <> template <class T> friend class A<int>::B; 10048Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10049 MultiTemplateParamsArg TempParams) { 10050 SourceLocation Loc = DS.getSourceRange().getBegin(); 10051 10052 assert(DS.isFriendSpecified()); 10053 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10054 10055 // Try to convert the decl specifier to a type. This works for 10056 // friend templates because ActOnTag never produces a ClassTemplateDecl 10057 // for a TUK_Friend. 10058 Declarator TheDeclarator(DS, Declarator::MemberContext); 10059 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10060 QualType T = TSI->getType(); 10061 if (TheDeclarator.isInvalidType()) 10062 return 0; 10063 10064 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10065 return 0; 10066 10067 // This is definitely an error in C++98. It's probably meant to 10068 // be forbidden in C++0x, too, but the specification is just 10069 // poorly written. 10070 // 10071 // The problem is with declarations like the following: 10072 // template <T> friend A<T>::foo; 10073 // where deciding whether a class C is a friend or not now hinges 10074 // on whether there exists an instantiation of A that causes 10075 // 'foo' to equal C. There are restrictions on class-heads 10076 // (which we declare (by fiat) elaborated friend declarations to 10077 // be) that makes this tractable. 10078 // 10079 // FIXME: handle "template <> friend class A<T>;", which 10080 // is possibly well-formed? Who even knows? 10081 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10082 Diag(Loc, diag::err_tagless_friend_type_template) 10083 << DS.getSourceRange(); 10084 return 0; 10085 } 10086 10087 // C++98 [class.friend]p1: A friend of a class is a function 10088 // or class that is not a member of the class . . . 10089 // This is fixed in DR77, which just barely didn't make the C++03 10090 // deadline. It's also a very silly restriction that seriously 10091 // affects inner classes and which nobody else seems to implement; 10092 // thus we never diagnose it, not even in -pedantic. 10093 // 10094 // But note that we could warn about it: it's always useless to 10095 // friend one of your own members (it's not, however, worthless to 10096 // friend a member of an arbitrary specialization of your template). 10097 10098 Decl *D; 10099 if (unsigned NumTempParamLists = TempParams.size()) 10100 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10101 NumTempParamLists, 10102 TempParams.release(), 10103 TSI, 10104 DS.getFriendSpecLoc()); 10105 else 10106 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 10107 10108 if (!D) 10109 return 0; 10110 10111 D->setAccess(AS_public); 10112 CurContext->addDecl(D); 10113 10114 return D; 10115} 10116 10117Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 10118 MultiTemplateParamsArg TemplateParams) { 10119 const DeclSpec &DS = D.getDeclSpec(); 10120 10121 assert(DS.isFriendSpecified()); 10122 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10123 10124 SourceLocation Loc = D.getIdentifierLoc(); 10125 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10126 QualType T = TInfo->getType(); 10127 10128 // C++ [class.friend]p1 10129 // A friend of a class is a function or class.... 10130 // Note that this sees through typedefs, which is intended. 10131 // It *doesn't* see through dependent types, which is correct 10132 // according to [temp.arg.type]p3: 10133 // If a declaration acquires a function type through a 10134 // type dependent on a template-parameter and this causes 10135 // a declaration that does not use the syntactic form of a 10136 // function declarator to have a function type, the program 10137 // is ill-formed. 10138 if (!T->isFunctionType()) { 10139 Diag(Loc, diag::err_unexpected_friend); 10140 10141 // It might be worthwhile to try to recover by creating an 10142 // appropriate declaration. 10143 return 0; 10144 } 10145 10146 // C++ [namespace.memdef]p3 10147 // - If a friend declaration in a non-local class first declares a 10148 // class or function, the friend class or function is a member 10149 // of the innermost enclosing namespace. 10150 // - The name of the friend is not found by simple name lookup 10151 // until a matching declaration is provided in that namespace 10152 // scope (either before or after the class declaration granting 10153 // friendship). 10154 // - If a friend function is called, its name may be found by the 10155 // name lookup that considers functions from namespaces and 10156 // classes associated with the types of the function arguments. 10157 // - When looking for a prior declaration of a class or a function 10158 // declared as a friend, scopes outside the innermost enclosing 10159 // namespace scope are not considered. 10160 10161 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10162 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10163 DeclarationName Name = NameInfo.getName(); 10164 assert(Name); 10165 10166 // Check for unexpanded parameter packs. 10167 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10168 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10169 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10170 return 0; 10171 10172 // The context we found the declaration in, or in which we should 10173 // create the declaration. 10174 DeclContext *DC; 10175 Scope *DCScope = S; 10176 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10177 ForRedeclaration); 10178 10179 // FIXME: there are different rules in local classes 10180 10181 // There are four cases here. 10182 // - There's no scope specifier, in which case we just go to the 10183 // appropriate scope and look for a function or function template 10184 // there as appropriate. 10185 // Recover from invalid scope qualifiers as if they just weren't there. 10186 if (SS.isInvalid() || !SS.isSet()) { 10187 // C++0x [namespace.memdef]p3: 10188 // If the name in a friend declaration is neither qualified nor 10189 // a template-id and the declaration is a function or an 10190 // elaborated-type-specifier, the lookup to determine whether 10191 // the entity has been previously declared shall not consider 10192 // any scopes outside the innermost enclosing namespace. 10193 // C++0x [class.friend]p11: 10194 // If a friend declaration appears in a local class and the name 10195 // specified is an unqualified name, a prior declaration is 10196 // looked up without considering scopes that are outside the 10197 // innermost enclosing non-class scope. For a friend function 10198 // declaration, if there is no prior declaration, the program is 10199 // ill-formed. 10200 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10201 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10202 10203 // Find the appropriate context according to the above. 10204 DC = CurContext; 10205 while (true) { 10206 // Skip class contexts. If someone can cite chapter and verse 10207 // for this behavior, that would be nice --- it's what GCC and 10208 // EDG do, and it seems like a reasonable intent, but the spec 10209 // really only says that checks for unqualified existing 10210 // declarations should stop at the nearest enclosing namespace, 10211 // not that they should only consider the nearest enclosing 10212 // namespace. 10213 while (DC->isRecord()) 10214 DC = DC->getParent(); 10215 10216 LookupQualifiedName(Previous, DC); 10217 10218 // TODO: decide what we think about using declarations. 10219 if (isLocal || !Previous.empty()) 10220 break; 10221 10222 if (isTemplateId) { 10223 if (isa<TranslationUnitDecl>(DC)) break; 10224 } else { 10225 if (DC->isFileContext()) break; 10226 } 10227 DC = DC->getParent(); 10228 } 10229 10230 // C++ [class.friend]p1: A friend of a class is a function or 10231 // class that is not a member of the class . . . 10232 // C++0x changes this for both friend types and functions. 10233 // Most C++ 98 compilers do seem to give an error here, so 10234 // we do, too. 10235 if (!Previous.empty() && DC->Equals(CurContext) 10236 && !getLangOptions().CPlusPlus0x) 10237 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10238 10239 DCScope = getScopeForDeclContext(S, DC); 10240 10241 // C++ [class.friend]p6: 10242 // A function can be defined in a friend declaration of a class if and 10243 // only if the class is a non-local class (9.8), the function name is 10244 // unqualified, and the function has namespace scope. 10245 if (isLocal && IsDefinition) { 10246 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10247 } 10248 10249 // - There's a non-dependent scope specifier, in which case we 10250 // compute it and do a previous lookup there for a function 10251 // or function template. 10252 } else if (!SS.getScopeRep()->isDependent()) { 10253 DC = computeDeclContext(SS); 10254 if (!DC) return 0; 10255 10256 if (RequireCompleteDeclContext(SS, DC)) return 0; 10257 10258 LookupQualifiedName(Previous, DC); 10259 10260 // Ignore things found implicitly in the wrong scope. 10261 // TODO: better diagnostics for this case. Suggesting the right 10262 // qualified scope would be nice... 10263 LookupResult::Filter F = Previous.makeFilter(); 10264 while (F.hasNext()) { 10265 NamedDecl *D = F.next(); 10266 if (!DC->InEnclosingNamespaceSetOf( 10267 D->getDeclContext()->getRedeclContext())) 10268 F.erase(); 10269 } 10270 F.done(); 10271 10272 if (Previous.empty()) { 10273 D.setInvalidType(); 10274 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 10275 return 0; 10276 } 10277 10278 // C++ [class.friend]p1: A friend of a class is a function or 10279 // class that is not a member of the class . . . 10280 if (DC->Equals(CurContext)) 10281 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10282 10283 if (IsDefinition) { 10284 // C++ [class.friend]p6: 10285 // A function can be defined in a friend declaration of a class if and 10286 // only if the class is a non-local class (9.8), the function name is 10287 // unqualified, and the function has namespace scope. 10288 SemaDiagnosticBuilder DB 10289 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10290 10291 DB << SS.getScopeRep(); 10292 if (DC->isFileContext()) 10293 DB << FixItHint::CreateRemoval(SS.getRange()); 10294 SS.clear(); 10295 } 10296 10297 // - There's a scope specifier that does not match any template 10298 // parameter lists, in which case we use some arbitrary context, 10299 // create a method or method template, and wait for instantiation. 10300 // - There's a scope specifier that does match some template 10301 // parameter lists, which we don't handle right now. 10302 } else { 10303 if (IsDefinition) { 10304 // C++ [class.friend]p6: 10305 // A function can be defined in a friend declaration of a class if and 10306 // only if the class is a non-local class (9.8), the function name is 10307 // unqualified, and the function has namespace scope. 10308 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10309 << SS.getScopeRep(); 10310 } 10311 10312 DC = CurContext; 10313 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10314 } 10315 10316 if (!DC->isRecord()) { 10317 // This implies that it has to be an operator or function. 10318 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10319 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10320 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10321 Diag(Loc, diag::err_introducing_special_friend) << 10322 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10323 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10324 return 0; 10325 } 10326 } 10327 10328 bool Redeclaration = false; 10329 bool AddToScope = true; 10330 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 10331 move(TemplateParams), 10332 IsDefinition, 10333 Redeclaration, AddToScope); 10334 if (!ND) return 0; 10335 10336 assert(ND->getDeclContext() == DC); 10337 assert(ND->getLexicalDeclContext() == CurContext); 10338 10339 // Add the function declaration to the appropriate lookup tables, 10340 // adjusting the redeclarations list as necessary. We don't 10341 // want to do this yet if the friending class is dependent. 10342 // 10343 // Also update the scope-based lookup if the target context's 10344 // lookup context is in lexical scope. 10345 if (!CurContext->isDependentContext()) { 10346 DC = DC->getRedeclContext(); 10347 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10348 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10349 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10350 } 10351 10352 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10353 D.getIdentifierLoc(), ND, 10354 DS.getFriendSpecLoc()); 10355 FrD->setAccess(AS_public); 10356 CurContext->addDecl(FrD); 10357 10358 if (ND->isInvalidDecl()) 10359 FrD->setInvalidDecl(); 10360 else { 10361 FunctionDecl *FD; 10362 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10363 FD = FTD->getTemplatedDecl(); 10364 else 10365 FD = cast<FunctionDecl>(ND); 10366 10367 // Mark templated-scope function declarations as unsupported. 10368 if (FD->getNumTemplateParameterLists()) 10369 FrD->setUnsupportedFriend(true); 10370 } 10371 10372 return ND; 10373} 10374 10375void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10376 AdjustDeclIfTemplate(Dcl); 10377 10378 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10379 if (!Fn) { 10380 Diag(DelLoc, diag::err_deleted_non_function); 10381 return; 10382 } 10383 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10384 Diag(DelLoc, diag::err_deleted_decl_not_first); 10385 Diag(Prev->getLocation(), diag::note_previous_declaration); 10386 // If the declaration wasn't the first, we delete the function anyway for 10387 // recovery. 10388 } 10389 Fn->setDeletedAsWritten(); 10390} 10391 10392void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10393 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10394 10395 if (MD) { 10396 if (MD->getParent()->isDependentType()) { 10397 MD->setDefaulted(); 10398 MD->setExplicitlyDefaulted(); 10399 return; 10400 } 10401 10402 CXXSpecialMember Member = getSpecialMember(MD); 10403 if (Member == CXXInvalid) { 10404 Diag(DefaultLoc, diag::err_default_special_members); 10405 return; 10406 } 10407 10408 MD->setDefaulted(); 10409 MD->setExplicitlyDefaulted(); 10410 10411 // If this definition appears within the record, do the checking when 10412 // the record is complete. 10413 const FunctionDecl *Primary = MD; 10414 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10415 // Find the uninstantiated declaration that actually had the '= default' 10416 // on it. 10417 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10418 10419 if (Primary == Primary->getCanonicalDecl()) 10420 return; 10421 10422 switch (Member) { 10423 case CXXDefaultConstructor: { 10424 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10425 CheckExplicitlyDefaultedDefaultConstructor(CD); 10426 if (!CD->isInvalidDecl()) 10427 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10428 break; 10429 } 10430 10431 case CXXCopyConstructor: { 10432 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10433 CheckExplicitlyDefaultedCopyConstructor(CD); 10434 if (!CD->isInvalidDecl()) 10435 DefineImplicitCopyConstructor(DefaultLoc, CD); 10436 break; 10437 } 10438 10439 case CXXCopyAssignment: { 10440 CheckExplicitlyDefaultedCopyAssignment(MD); 10441 if (!MD->isInvalidDecl()) 10442 DefineImplicitCopyAssignment(DefaultLoc, MD); 10443 break; 10444 } 10445 10446 case CXXDestructor: { 10447 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10448 CheckExplicitlyDefaultedDestructor(DD); 10449 if (!DD->isInvalidDecl()) 10450 DefineImplicitDestructor(DefaultLoc, DD); 10451 break; 10452 } 10453 10454 case CXXMoveConstructor: { 10455 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10456 CheckExplicitlyDefaultedMoveConstructor(CD); 10457 if (!CD->isInvalidDecl()) 10458 DefineImplicitMoveConstructor(DefaultLoc, CD); 10459 break; 10460 } 10461 10462 case CXXMoveAssignment: { 10463 CheckExplicitlyDefaultedMoveAssignment(MD); 10464 if (!MD->isInvalidDecl()) 10465 DefineImplicitMoveAssignment(DefaultLoc, MD); 10466 break; 10467 } 10468 10469 case CXXInvalid: 10470 llvm_unreachable("Invalid special member."); 10471 } 10472 } else { 10473 Diag(DefaultLoc, diag::err_default_special_members); 10474 } 10475} 10476 10477static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10478 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10479 Stmt *SubStmt = *CI; 10480 if (!SubStmt) 10481 continue; 10482 if (isa<ReturnStmt>(SubStmt)) 10483 Self.Diag(SubStmt->getSourceRange().getBegin(), 10484 diag::err_return_in_constructor_handler); 10485 if (!isa<Expr>(SubStmt)) 10486 SearchForReturnInStmt(Self, SubStmt); 10487 } 10488} 10489 10490void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10491 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10492 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10493 SearchForReturnInStmt(*this, Handler); 10494 } 10495} 10496 10497bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10498 const CXXMethodDecl *Old) { 10499 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10500 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10501 10502 if (Context.hasSameType(NewTy, OldTy) || 10503 NewTy->isDependentType() || OldTy->isDependentType()) 10504 return false; 10505 10506 // Check if the return types are covariant 10507 QualType NewClassTy, OldClassTy; 10508 10509 /// Both types must be pointers or references to classes. 10510 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10511 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10512 NewClassTy = NewPT->getPointeeType(); 10513 OldClassTy = OldPT->getPointeeType(); 10514 } 10515 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10516 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10517 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10518 NewClassTy = NewRT->getPointeeType(); 10519 OldClassTy = OldRT->getPointeeType(); 10520 } 10521 } 10522 } 10523 10524 // The return types aren't either both pointers or references to a class type. 10525 if (NewClassTy.isNull()) { 10526 Diag(New->getLocation(), 10527 diag::err_different_return_type_for_overriding_virtual_function) 10528 << New->getDeclName() << NewTy << OldTy; 10529 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10530 10531 return true; 10532 } 10533 10534 // C++ [class.virtual]p6: 10535 // If the return type of D::f differs from the return type of B::f, the 10536 // class type in the return type of D::f shall be complete at the point of 10537 // declaration of D::f or shall be the class type D. 10538 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10539 if (!RT->isBeingDefined() && 10540 RequireCompleteType(New->getLocation(), NewClassTy, 10541 PDiag(diag::err_covariant_return_incomplete) 10542 << New->getDeclName())) 10543 return true; 10544 } 10545 10546 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10547 // Check if the new class derives from the old class. 10548 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10549 Diag(New->getLocation(), 10550 diag::err_covariant_return_not_derived) 10551 << New->getDeclName() << NewTy << OldTy; 10552 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10553 return true; 10554 } 10555 10556 // Check if we the conversion from derived to base is valid. 10557 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10558 diag::err_covariant_return_inaccessible_base, 10559 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10560 // FIXME: Should this point to the return type? 10561 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10562 // FIXME: this note won't trigger for delayed access control 10563 // diagnostics, and it's impossible to get an undelayed error 10564 // here from access control during the original parse because 10565 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10566 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10567 return true; 10568 } 10569 } 10570 10571 // The qualifiers of the return types must be the same. 10572 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10573 Diag(New->getLocation(), 10574 diag::err_covariant_return_type_different_qualifications) 10575 << New->getDeclName() << NewTy << OldTy; 10576 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10577 return true; 10578 }; 10579 10580 10581 // The new class type must have the same or less qualifiers as the old type. 10582 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10583 Diag(New->getLocation(), 10584 diag::err_covariant_return_type_class_type_more_qualified) 10585 << New->getDeclName() << NewTy << OldTy; 10586 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10587 return true; 10588 }; 10589 10590 return false; 10591} 10592 10593/// \brief Mark the given method pure. 10594/// 10595/// \param Method the method to be marked pure. 10596/// 10597/// \param InitRange the source range that covers the "0" initializer. 10598bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10599 SourceLocation EndLoc = InitRange.getEnd(); 10600 if (EndLoc.isValid()) 10601 Method->setRangeEnd(EndLoc); 10602 10603 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10604 Method->setPure(); 10605 return false; 10606 } 10607 10608 if (!Method->isInvalidDecl()) 10609 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10610 << Method->getDeclName() << InitRange; 10611 return true; 10612} 10613 10614/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10615/// an initializer for the out-of-line declaration 'Dcl'. The scope 10616/// is a fresh scope pushed for just this purpose. 10617/// 10618/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10619/// static data member of class X, names should be looked up in the scope of 10620/// class X. 10621void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10622 // If there is no declaration, there was an error parsing it. 10623 if (D == 0 || D->isInvalidDecl()) return; 10624 10625 // We should only get called for declarations with scope specifiers, like: 10626 // int foo::bar; 10627 assert(D->isOutOfLine()); 10628 EnterDeclaratorContext(S, D->getDeclContext()); 10629} 10630 10631/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10632/// initializer for the out-of-line declaration 'D'. 10633void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10634 // If there is no declaration, there was an error parsing it. 10635 if (D == 0 || D->isInvalidDecl()) return; 10636 10637 assert(D->isOutOfLine()); 10638 ExitDeclaratorContext(S); 10639} 10640 10641/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10642/// C++ if/switch/while/for statement. 10643/// e.g: "if (int x = f()) {...}" 10644DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10645 // C++ 6.4p2: 10646 // The declarator shall not specify a function or an array. 10647 // The type-specifier-seq shall not contain typedef and shall not declare a 10648 // new class or enumeration. 10649 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10650 "Parser allowed 'typedef' as storage class of condition decl."); 10651 10652 Decl *Dcl = ActOnDeclarator(S, D); 10653 if (!Dcl) 10654 return true; 10655 10656 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10657 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10658 << D.getSourceRange(); 10659 return true; 10660 } 10661 10662 return Dcl; 10663} 10664 10665void Sema::LoadExternalVTableUses() { 10666 if (!ExternalSource) 10667 return; 10668 10669 SmallVector<ExternalVTableUse, 4> VTables; 10670 ExternalSource->ReadUsedVTables(VTables); 10671 SmallVector<VTableUse, 4> NewUses; 10672 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10673 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10674 = VTablesUsed.find(VTables[I].Record); 10675 // Even if a definition wasn't required before, it may be required now. 10676 if (Pos != VTablesUsed.end()) { 10677 if (!Pos->second && VTables[I].DefinitionRequired) 10678 Pos->second = true; 10679 continue; 10680 } 10681 10682 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10683 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10684 } 10685 10686 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10687} 10688 10689void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10690 bool DefinitionRequired) { 10691 // Ignore any vtable uses in unevaluated operands or for classes that do 10692 // not have a vtable. 10693 if (!Class->isDynamicClass() || Class->isDependentContext() || 10694 CurContext->isDependentContext() || 10695 ExprEvalContexts.back().Context == Unevaluated) 10696 return; 10697 10698 // Try to insert this class into the map. 10699 LoadExternalVTableUses(); 10700 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10701 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10702 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10703 if (!Pos.second) { 10704 // If we already had an entry, check to see if we are promoting this vtable 10705 // to required a definition. If so, we need to reappend to the VTableUses 10706 // list, since we may have already processed the first entry. 10707 if (DefinitionRequired && !Pos.first->second) { 10708 Pos.first->second = true; 10709 } else { 10710 // Otherwise, we can early exit. 10711 return; 10712 } 10713 } 10714 10715 // Local classes need to have their virtual members marked 10716 // immediately. For all other classes, we mark their virtual members 10717 // at the end of the translation unit. 10718 if (Class->isLocalClass()) 10719 MarkVirtualMembersReferenced(Loc, Class); 10720 else 10721 VTableUses.push_back(std::make_pair(Class, Loc)); 10722} 10723 10724bool Sema::DefineUsedVTables() { 10725 LoadExternalVTableUses(); 10726 if (VTableUses.empty()) 10727 return false; 10728 10729 // Note: The VTableUses vector could grow as a result of marking 10730 // the members of a class as "used", so we check the size each 10731 // time through the loop and prefer indices (with are stable) to 10732 // iterators (which are not). 10733 bool DefinedAnything = false; 10734 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10735 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10736 if (!Class) 10737 continue; 10738 10739 SourceLocation Loc = VTableUses[I].second; 10740 10741 // If this class has a key function, but that key function is 10742 // defined in another translation unit, we don't need to emit the 10743 // vtable even though we're using it. 10744 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10745 if (KeyFunction && !KeyFunction->hasBody()) { 10746 switch (KeyFunction->getTemplateSpecializationKind()) { 10747 case TSK_Undeclared: 10748 case TSK_ExplicitSpecialization: 10749 case TSK_ExplicitInstantiationDeclaration: 10750 // The key function is in another translation unit. 10751 continue; 10752 10753 case TSK_ExplicitInstantiationDefinition: 10754 case TSK_ImplicitInstantiation: 10755 // We will be instantiating the key function. 10756 break; 10757 } 10758 } else if (!KeyFunction) { 10759 // If we have a class with no key function that is the subject 10760 // of an explicit instantiation declaration, suppress the 10761 // vtable; it will live with the explicit instantiation 10762 // definition. 10763 bool IsExplicitInstantiationDeclaration 10764 = Class->getTemplateSpecializationKind() 10765 == TSK_ExplicitInstantiationDeclaration; 10766 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10767 REnd = Class->redecls_end(); 10768 R != REnd; ++R) { 10769 TemplateSpecializationKind TSK 10770 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10771 if (TSK == TSK_ExplicitInstantiationDeclaration) 10772 IsExplicitInstantiationDeclaration = true; 10773 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10774 IsExplicitInstantiationDeclaration = false; 10775 break; 10776 } 10777 } 10778 10779 if (IsExplicitInstantiationDeclaration) 10780 continue; 10781 } 10782 10783 // Mark all of the virtual members of this class as referenced, so 10784 // that we can build a vtable. Then, tell the AST consumer that a 10785 // vtable for this class is required. 10786 DefinedAnything = true; 10787 MarkVirtualMembersReferenced(Loc, Class); 10788 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10789 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10790 10791 // Optionally warn if we're emitting a weak vtable. 10792 if (Class->getLinkage() == ExternalLinkage && 10793 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10794 const FunctionDecl *KeyFunctionDef = 0; 10795 if (!KeyFunction || 10796 (KeyFunction->hasBody(KeyFunctionDef) && 10797 KeyFunctionDef->isInlined())) 10798 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10799 } 10800 } 10801 VTableUses.clear(); 10802 10803 return DefinedAnything; 10804} 10805 10806void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10807 const CXXRecordDecl *RD) { 10808 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10809 e = RD->method_end(); i != e; ++i) { 10810 CXXMethodDecl *MD = *i; 10811 10812 // C++ [basic.def.odr]p2: 10813 // [...] A virtual member function is used if it is not pure. [...] 10814 if (MD->isVirtual() && !MD->isPure()) 10815 MarkDeclarationReferenced(Loc, MD); 10816 } 10817 10818 // Only classes that have virtual bases need a VTT. 10819 if (RD->getNumVBases() == 0) 10820 return; 10821 10822 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10823 e = RD->bases_end(); i != e; ++i) { 10824 const CXXRecordDecl *Base = 10825 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10826 if (Base->getNumVBases() == 0) 10827 continue; 10828 MarkVirtualMembersReferenced(Loc, Base); 10829 } 10830} 10831 10832/// SetIvarInitializers - This routine builds initialization ASTs for the 10833/// Objective-C implementation whose ivars need be initialized. 10834void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10835 if (!getLangOptions().CPlusPlus) 10836 return; 10837 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10838 SmallVector<ObjCIvarDecl*, 8> ivars; 10839 CollectIvarsToConstructOrDestruct(OID, ivars); 10840 if (ivars.empty()) 10841 return; 10842 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10843 for (unsigned i = 0; i < ivars.size(); i++) { 10844 FieldDecl *Field = ivars[i]; 10845 if (Field->isInvalidDecl()) 10846 continue; 10847 10848 CXXCtorInitializer *Member; 10849 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10850 InitializationKind InitKind = 10851 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10852 10853 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10854 ExprResult MemberInit = 10855 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10856 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10857 // Note, MemberInit could actually come back empty if no initialization 10858 // is required (e.g., because it would call a trivial default constructor) 10859 if (!MemberInit.get() || MemberInit.isInvalid()) 10860 continue; 10861 10862 Member = 10863 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10864 SourceLocation(), 10865 MemberInit.takeAs<Expr>(), 10866 SourceLocation()); 10867 AllToInit.push_back(Member); 10868 10869 // Be sure that the destructor is accessible and is marked as referenced. 10870 if (const RecordType *RecordTy 10871 = Context.getBaseElementType(Field->getType()) 10872 ->getAs<RecordType>()) { 10873 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10874 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10875 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10876 CheckDestructorAccess(Field->getLocation(), Destructor, 10877 PDiag(diag::err_access_dtor_ivar) 10878 << Context.getBaseElementType(Field->getType())); 10879 } 10880 } 10881 } 10882 ObjCImplementation->setIvarInitializers(Context, 10883 AllToInit.data(), AllToInit.size()); 10884 } 10885} 10886 10887static 10888void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10889 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10890 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10891 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10892 Sema &S) { 10893 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10894 CE = Current.end(); 10895 if (Ctor->isInvalidDecl()) 10896 return; 10897 10898 const FunctionDecl *FNTarget = 0; 10899 CXXConstructorDecl *Target; 10900 10901 // We ignore the result here since if we don't have a body, Target will be 10902 // null below. 10903 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10904 Target 10905= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10906 10907 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10908 // Avoid dereferencing a null pointer here. 10909 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10910 10911 if (!Current.insert(Canonical)) 10912 return; 10913 10914 // We know that beyond here, we aren't chaining into a cycle. 10915 if (!Target || !Target->isDelegatingConstructor() || 10916 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10917 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10918 Valid.insert(*CI); 10919 Current.clear(); 10920 // We've hit a cycle. 10921 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10922 Current.count(TCanonical)) { 10923 // If we haven't diagnosed this cycle yet, do so now. 10924 if (!Invalid.count(TCanonical)) { 10925 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10926 diag::warn_delegating_ctor_cycle) 10927 << Ctor; 10928 10929 // Don't add a note for a function delegating directo to itself. 10930 if (TCanonical != Canonical) 10931 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10932 10933 CXXConstructorDecl *C = Target; 10934 while (C->getCanonicalDecl() != Canonical) { 10935 (void)C->getTargetConstructor()->hasBody(FNTarget); 10936 assert(FNTarget && "Ctor cycle through bodiless function"); 10937 10938 C 10939 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10940 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10941 } 10942 } 10943 10944 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10945 Invalid.insert(*CI); 10946 Current.clear(); 10947 } else { 10948 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10949 } 10950} 10951 10952 10953void Sema::CheckDelegatingCtorCycles() { 10954 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10955 10956 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10957 CE = Current.end(); 10958 10959 for (DelegatingCtorDeclsType::iterator 10960 I = DelegatingCtorDecls.begin(ExternalSource), 10961 E = DelegatingCtorDecls.end(); 10962 I != E; ++I) { 10963 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10964 } 10965 10966 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10967 (*CI)->setInvalidDecl(); 10968} 10969 10970/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10971Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10972 // Implicitly declared functions (e.g. copy constructors) are 10973 // __host__ __device__ 10974 if (D->isImplicit()) 10975 return CFT_HostDevice; 10976 10977 if (D->hasAttr<CUDAGlobalAttr>()) 10978 return CFT_Global; 10979 10980 if (D->hasAttr<CUDADeviceAttr>()) { 10981 if (D->hasAttr<CUDAHostAttr>()) 10982 return CFT_HostDevice; 10983 else 10984 return CFT_Device; 10985 } 10986 10987 return CFT_Host; 10988} 10989 10990bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10991 CUDAFunctionTarget CalleeTarget) { 10992 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10993 // Callable from the device only." 10994 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10995 return true; 10996 10997 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10998 // Callable from the host only." 10999 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11000 // Callable from the host only." 11001 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11002 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11003 return true; 11004 11005 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11006 return true; 11007 11008 return false; 11009} 11010