SemaDeclCXX.cpp revision 9aab9c4116bb3ea876d92d4af10bff7f4c451f24
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer. 1749MemInitResult 1750Sema::BuildMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 SourceLocation IdLoc, 1756 const MultiInitializer &Args, 1757 SourceLocation EllipsisLoc) { 1758 if (!ConstructorD) 1759 return true; 1760 1761 AdjustDeclIfTemplate(ConstructorD); 1762 1763 CXXConstructorDecl *Constructor 1764 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1765 if (!Constructor) { 1766 // The user wrote a constructor initializer on a function that is 1767 // not a C++ constructor. Ignore the error for now, because we may 1768 // have more member initializers coming; we'll diagnose it just 1769 // once in ActOnMemInitializers. 1770 return true; 1771 } 1772 1773 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1774 1775 // C++ [class.base.init]p2: 1776 // Names in a mem-initializer-id are looked up in the scope of the 1777 // constructor's class and, if not found in that scope, are looked 1778 // up in the scope containing the constructor's definition. 1779 // [Note: if the constructor's class contains a member with the 1780 // same name as a direct or virtual base class of the class, a 1781 // mem-initializer-id naming the member or base class and composed 1782 // of a single identifier refers to the class member. A 1783 // mem-initializer-id for the hidden base class may be specified 1784 // using a qualified name. ] 1785 if (!SS.getScopeRep() && !TemplateTypeTy) { 1786 // Look for a member, first. 1787 DeclContext::lookup_result Result 1788 = ClassDecl->lookup(MemberOrBase); 1789 if (Result.first != Result.second) { 1790 ValueDecl *Member; 1791 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1792 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1793 if (EllipsisLoc.isValid()) 1794 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1795 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1796 1797 return BuildMemberInitializer(Member, Args, IdLoc); 1798 } 1799 } 1800 } 1801 // It didn't name a member, so see if it names a class. 1802 QualType BaseType; 1803 TypeSourceInfo *TInfo = 0; 1804 1805 if (TemplateTypeTy) { 1806 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1807 } else { 1808 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1809 LookupParsedName(R, S, &SS); 1810 1811 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1812 if (!TyD) { 1813 if (R.isAmbiguous()) return true; 1814 1815 // We don't want access-control diagnostics here. 1816 R.suppressDiagnostics(); 1817 1818 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1819 bool NotUnknownSpecialization = false; 1820 DeclContext *DC = computeDeclContext(SS, false); 1821 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1822 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1823 1824 if (!NotUnknownSpecialization) { 1825 // When the scope specifier can refer to a member of an unknown 1826 // specialization, we take it as a type name. 1827 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1828 SS.getWithLocInContext(Context), 1829 *MemberOrBase, IdLoc); 1830 if (BaseType.isNull()) 1831 return true; 1832 1833 R.clear(); 1834 R.setLookupName(MemberOrBase); 1835 } 1836 } 1837 1838 // If no results were found, try to correct typos. 1839 TypoCorrection Corr; 1840 if (R.empty() && BaseType.isNull() && 1841 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1842 ClassDecl, false, CTC_NoKeywords))) { 1843 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1844 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1845 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1846 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1847 // We have found a non-static data member with a similar 1848 // name to what was typed; complain and initialize that 1849 // member. 1850 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1851 << MemberOrBase << true << CorrectedQuotedStr 1852 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1853 Diag(Member->getLocation(), diag::note_previous_decl) 1854 << CorrectedQuotedStr; 1855 1856 return BuildMemberInitializer(Member, Args, IdLoc); 1857 } 1858 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1859 const CXXBaseSpecifier *DirectBaseSpec; 1860 const CXXBaseSpecifier *VirtualBaseSpec; 1861 if (FindBaseInitializer(*this, ClassDecl, 1862 Context.getTypeDeclType(Type), 1863 DirectBaseSpec, VirtualBaseSpec)) { 1864 // We have found a direct or virtual base class with a 1865 // similar name to what was typed; complain and initialize 1866 // that base class. 1867 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1868 << MemberOrBase << false << CorrectedQuotedStr 1869 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1870 1871 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1872 : VirtualBaseSpec; 1873 Diag(BaseSpec->getSourceRange().getBegin(), 1874 diag::note_base_class_specified_here) 1875 << BaseSpec->getType() 1876 << BaseSpec->getSourceRange(); 1877 1878 TyD = Type; 1879 } 1880 } 1881 } 1882 1883 if (!TyD && BaseType.isNull()) { 1884 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1885 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1886 return true; 1887 } 1888 } 1889 1890 if (BaseType.isNull()) { 1891 BaseType = Context.getTypeDeclType(TyD); 1892 if (SS.isSet()) { 1893 NestedNameSpecifier *Qualifier = 1894 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1895 1896 // FIXME: preserve source range information 1897 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1898 } 1899 } 1900 } 1901 1902 if (!TInfo) 1903 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1904 1905 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1906} 1907 1908/// Checks a member initializer expression for cases where reference (or 1909/// pointer) members are bound to by-value parameters (or their addresses). 1910static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1911 Expr *Init, 1912 SourceLocation IdLoc) { 1913 QualType MemberTy = Member->getType(); 1914 1915 // We only handle pointers and references currently. 1916 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1917 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1918 return; 1919 1920 const bool IsPointer = MemberTy->isPointerType(); 1921 if (IsPointer) { 1922 if (const UnaryOperator *Op 1923 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1924 // The only case we're worried about with pointers requires taking the 1925 // address. 1926 if (Op->getOpcode() != UO_AddrOf) 1927 return; 1928 1929 Init = Op->getSubExpr(); 1930 } else { 1931 // We only handle address-of expression initializers for pointers. 1932 return; 1933 } 1934 } 1935 1936 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1937 // Taking the address of a temporary will be diagnosed as a hard error. 1938 if (IsPointer) 1939 return; 1940 1941 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1942 << Member << Init->getSourceRange(); 1943 } else if (const DeclRefExpr *DRE 1944 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1945 // We only warn when referring to a non-reference parameter declaration. 1946 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1947 if (!Parameter || Parameter->getType()->isReferenceType()) 1948 return; 1949 1950 S.Diag(Init->getExprLoc(), 1951 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1952 : diag::warn_bind_ref_member_to_parameter) 1953 << Member << Parameter << Init->getSourceRange(); 1954 } else { 1955 // Other initializers are fine. 1956 return; 1957 } 1958 1959 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1960 << (unsigned)IsPointer; 1961} 1962 1963/// Checks an initializer expression for use of uninitialized fields, such as 1964/// containing the field that is being initialized. Returns true if there is an 1965/// uninitialized field was used an updates the SourceLocation parameter; false 1966/// otherwise. 1967static bool InitExprContainsUninitializedFields(const Stmt *S, 1968 const ValueDecl *LhsField, 1969 SourceLocation *L) { 1970 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1971 1972 if (isa<CallExpr>(S)) { 1973 // Do not descend into function calls or constructors, as the use 1974 // of an uninitialized field may be valid. One would have to inspect 1975 // the contents of the function/ctor to determine if it is safe or not. 1976 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1977 // may be safe, depending on what the function/ctor does. 1978 return false; 1979 } 1980 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1981 const NamedDecl *RhsField = ME->getMemberDecl(); 1982 1983 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1984 // The member expression points to a static data member. 1985 assert(VD->isStaticDataMember() && 1986 "Member points to non-static data member!"); 1987 (void)VD; 1988 return false; 1989 } 1990 1991 if (isa<EnumConstantDecl>(RhsField)) { 1992 // The member expression points to an enum. 1993 return false; 1994 } 1995 1996 if (RhsField == LhsField) { 1997 // Initializing a field with itself. Throw a warning. 1998 // But wait; there are exceptions! 1999 // Exception #1: The field may not belong to this record. 2000 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2001 const Expr *base = ME->getBase(); 2002 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2003 // Even though the field matches, it does not belong to this record. 2004 return false; 2005 } 2006 // None of the exceptions triggered; return true to indicate an 2007 // uninitialized field was used. 2008 *L = ME->getMemberLoc(); 2009 return true; 2010 } 2011 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2012 // sizeof/alignof doesn't reference contents, do not warn. 2013 return false; 2014 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2015 // address-of doesn't reference contents (the pointer may be dereferenced 2016 // in the same expression but it would be rare; and weird). 2017 if (UOE->getOpcode() == UO_AddrOf) 2018 return false; 2019 } 2020 for (Stmt::const_child_range it = S->children(); it; ++it) { 2021 if (!*it) { 2022 // An expression such as 'member(arg ?: "")' may trigger this. 2023 continue; 2024 } 2025 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2026 return true; 2027 } 2028 return false; 2029} 2030 2031MemInitResult 2032Sema::BuildMemberInitializer(ValueDecl *Member, 2033 const MultiInitializer &Args, 2034 SourceLocation IdLoc) { 2035 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2036 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2037 assert((DirectMember || IndirectMember) && 2038 "Member must be a FieldDecl or IndirectFieldDecl"); 2039 2040 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2041 return true; 2042 2043 if (Member->isInvalidDecl()) 2044 return true; 2045 2046 // Diagnose value-uses of fields to initialize themselves, e.g. 2047 // foo(foo) 2048 // where foo is not also a parameter to the constructor. 2049 // TODO: implement -Wuninitialized and fold this into that framework. 2050 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2051 I != E; ++I) { 2052 SourceLocation L; 2053 Expr *Arg = *I; 2054 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2055 Arg = DIE->getInit(); 2056 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2057 // FIXME: Return true in the case when other fields are used before being 2058 // uninitialized. For example, let this field be the i'th field. When 2059 // initializing the i'th field, throw a warning if any of the >= i'th 2060 // fields are used, as they are not yet initialized. 2061 // Right now we are only handling the case where the i'th field uses 2062 // itself in its initializer. 2063 Diag(L, diag::warn_field_is_uninit); 2064 } 2065 } 2066 2067 bool HasDependentArg = Args.isTypeDependent(); 2068 2069 Expr *Init; 2070 if (Member->getType()->isDependentType() || HasDependentArg) { 2071 // Can't check initialization for a member of dependent type or when 2072 // any of the arguments are type-dependent expressions. 2073 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2074 2075 DiscardCleanupsInEvaluationContext(); 2076 } else { 2077 // Initialize the member. 2078 InitializedEntity MemberEntity = 2079 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2080 : InitializedEntity::InitializeMember(IndirectMember, 0); 2081 InitializationKind Kind = 2082 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2083 Args.getEndLoc()); 2084 2085 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2086 if (MemberInit.isInvalid()) 2087 return true; 2088 2089 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2090 2091 // C++0x [class.base.init]p7: 2092 // The initialization of each base and member constitutes a 2093 // full-expression. 2094 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2095 if (MemberInit.isInvalid()) 2096 return true; 2097 2098 // If we are in a dependent context, template instantiation will 2099 // perform this type-checking again. Just save the arguments that we 2100 // received in a ParenListExpr. 2101 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2102 // of the information that we have about the member 2103 // initializer. However, deconstructing the ASTs is a dicey process, 2104 // and this approach is far more likely to get the corner cases right. 2105 if (CurContext->isDependentContext()) { 2106 Init = Args.CreateInitExpr(Context, 2107 Member->getType().getNonReferenceType()); 2108 } else { 2109 Init = MemberInit.get(); 2110 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2111 } 2112 } 2113 2114 if (DirectMember) { 2115 return new (Context) CXXCtorInitializer(Context, DirectMember, 2116 IdLoc, Args.getStartLoc(), 2117 Init, Args.getEndLoc()); 2118 } else { 2119 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } 2123} 2124 2125MemInitResult 2126Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2127 const MultiInitializer &Args, 2128 CXXRecordDecl *ClassDecl) { 2129 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2130 if (!LangOpts.CPlusPlus0x) 2131 return Diag(NameLoc, diag::err_delegating_ctor) 2132 << TInfo->getTypeLoc().getLocalSourceRange(); 2133 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2134 2135 // Initialize the object. 2136 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2137 QualType(ClassDecl->getTypeForDecl(), 0)); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2143 if (DelegationInit.isInvalid()) 2144 return true; 2145 2146 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2147 "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2159 DelegationInit.takeAs<Expr>(), 2160 Args.getEndLoc()); 2161} 2162 2163MemInitResult 2164Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2165 const MultiInitializer &Args, 2166 CXXRecordDecl *ClassDecl, 2167 SourceLocation EllipsisLoc) { 2168 bool HasDependentArg = Args.isTypeDependent(); 2169 2170 SourceLocation BaseLoc 2171 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2172 2173 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2174 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2175 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2176 2177 // C++ [class.base.init]p2: 2178 // [...] Unless the mem-initializer-id names a nonstatic data 2179 // member of the constructor's class or a direct or virtual base 2180 // of that class, the mem-initializer is ill-formed. A 2181 // mem-initializer-list can initialize a base class using any 2182 // name that denotes that base class type. 2183 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2184 2185 if (EllipsisLoc.isValid()) { 2186 // This is a pack expansion. 2187 if (!BaseType->containsUnexpandedParameterPack()) { 2188 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2189 << SourceRange(BaseLoc, Args.getEndLoc()); 2190 2191 EllipsisLoc = SourceLocation(); 2192 } 2193 } else { 2194 // Check for any unexpanded parameter packs. 2195 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2196 return true; 2197 2198 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2199 return true; 2200 } 2201 2202 // Check for direct and virtual base classes. 2203 const CXXBaseSpecifier *DirectBaseSpec = 0; 2204 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2205 if (!Dependent) { 2206 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2207 BaseType)) 2208 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2209 2210 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2211 VirtualBaseSpec); 2212 2213 // C++ [base.class.init]p2: 2214 // Unless the mem-initializer-id names a nonstatic data member of the 2215 // constructor's class or a direct or virtual base of that class, the 2216 // mem-initializer is ill-formed. 2217 if (!DirectBaseSpec && !VirtualBaseSpec) { 2218 // If the class has any dependent bases, then it's possible that 2219 // one of those types will resolve to the same type as 2220 // BaseType. Therefore, just treat this as a dependent base 2221 // class initialization. FIXME: Should we try to check the 2222 // initialization anyway? It seems odd. 2223 if (ClassDecl->hasAnyDependentBases()) 2224 Dependent = true; 2225 else 2226 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2227 << BaseType << Context.getTypeDeclType(ClassDecl) 2228 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 } 2230 } 2231 2232 if (Dependent) { 2233 // Can't check initialization for a base of dependent type or when 2234 // any of the arguments are type-dependent expressions. 2235 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2236 2237 DiscardCleanupsInEvaluationContext(); 2238 2239 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2240 /*IsVirtual=*/false, 2241 Args.getStartLoc(), BaseInit, 2242 Args.getEndLoc(), EllipsisLoc); 2243 } 2244 2245 // C++ [base.class.init]p2: 2246 // If a mem-initializer-id is ambiguous because it designates both 2247 // a direct non-virtual base class and an inherited virtual base 2248 // class, the mem-initializer is ill-formed. 2249 if (DirectBaseSpec && VirtualBaseSpec) 2250 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 CXXBaseSpecifier *BaseSpec 2254 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2255 if (!BaseSpec) 2256 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2257 2258 // Initialize the base. 2259 InitializedEntity BaseEntity = 2260 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2261 InitializationKind Kind = 2262 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2263 Args.getEndLoc()); 2264 2265 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2266 if (BaseInit.isInvalid()) 2267 return true; 2268 2269 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2270 2271 // C++0x [class.base.init]p7: 2272 // The initialization of each base and member constitutes a 2273 // full-expression. 2274 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2275 if (BaseInit.isInvalid()) 2276 return true; 2277 2278 // If we are in a dependent context, template instantiation will 2279 // perform this type-checking again. Just save the arguments that we 2280 // received in a ParenListExpr. 2281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2282 // of the information that we have about the base 2283 // initializer. However, deconstructing the ASTs is a dicey process, 2284 // and this approach is far more likely to get the corner cases right. 2285 if (CurContext->isDependentContext()) 2286 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2287 2288 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2289 BaseSpec->isVirtual(), 2290 Args.getStartLoc(), 2291 BaseInit.takeAs<Expr>(), 2292 Args.getEndLoc(), EllipsisLoc); 2293} 2294 2295// Create a static_cast\<T&&>(expr). 2296static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2297 QualType ExprType = E->getType(); 2298 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2299 SourceLocation ExprLoc = E->getLocStart(); 2300 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2301 TargetType, ExprLoc); 2302 2303 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2304 SourceRange(ExprLoc, ExprLoc), 2305 E->getSourceRange()).take(); 2306} 2307 2308/// ImplicitInitializerKind - How an implicit base or member initializer should 2309/// initialize its base or member. 2310enum ImplicitInitializerKind { 2311 IIK_Default, 2312 IIK_Copy, 2313 IIK_Move 2314}; 2315 2316static bool 2317BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2318 ImplicitInitializerKind ImplicitInitKind, 2319 CXXBaseSpecifier *BaseSpec, 2320 bool IsInheritedVirtualBase, 2321 CXXCtorInitializer *&CXXBaseInit) { 2322 InitializedEntity InitEntity 2323 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2324 IsInheritedVirtualBase); 2325 2326 ExprResult BaseInit; 2327 2328 switch (ImplicitInitKind) { 2329 case IIK_Default: { 2330 InitializationKind InitKind 2331 = InitializationKind::CreateDefault(Constructor->getLocation()); 2332 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2333 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2334 MultiExprArg(SemaRef, 0, 0)); 2335 break; 2336 } 2337 2338 case IIK_Move: 2339 case IIK_Copy: { 2340 bool Moving = ImplicitInitKind == IIK_Move; 2341 ParmVarDecl *Param = Constructor->getParamDecl(0); 2342 QualType ParamType = Param->getType().getNonReferenceType(); 2343 2344 Expr *CopyCtorArg = 2345 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2346 Constructor->getLocation(), ParamType, 2347 VK_LValue, 0); 2348 2349 // Cast to the base class to avoid ambiguities. 2350 QualType ArgTy = 2351 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2352 ParamType.getQualifiers()); 2353 2354 if (Moving) { 2355 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2356 } 2357 2358 CXXCastPath BasePath; 2359 BasePath.push_back(BaseSpec); 2360 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2361 CK_UncheckedDerivedToBase, 2362 Moving ? VK_XValue : VK_LValue, 2363 &BasePath).take(); 2364 2365 InitializationKind InitKind 2366 = InitializationKind::CreateDirect(Constructor->getLocation(), 2367 SourceLocation(), SourceLocation()); 2368 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2369 &CopyCtorArg, 1); 2370 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2371 MultiExprArg(&CopyCtorArg, 1)); 2372 break; 2373 } 2374 } 2375 2376 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2377 if (BaseInit.isInvalid()) 2378 return true; 2379 2380 CXXBaseInit = 2381 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2382 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2383 SourceLocation()), 2384 BaseSpec->isVirtual(), 2385 SourceLocation(), 2386 BaseInit.takeAs<Expr>(), 2387 SourceLocation(), 2388 SourceLocation()); 2389 2390 return false; 2391} 2392 2393static bool RefersToRValueRef(Expr *MemRef) { 2394 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2395 return Referenced->getType()->isRValueReferenceType(); 2396} 2397 2398static bool 2399BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 FieldDecl *Field, IndirectFieldDecl *Indirect, 2402 CXXCtorInitializer *&CXXMemberInit) { 2403 if (Field->isInvalidDecl()) 2404 return true; 2405 2406 SourceLocation Loc = Constructor->getLocation(); 2407 2408 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2409 bool Moving = ImplicitInitKind == IIK_Move; 2410 ParmVarDecl *Param = Constructor->getParamDecl(0); 2411 QualType ParamType = Param->getType().getNonReferenceType(); 2412 2413 // Suppress copying zero-width bitfields. 2414 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636 2637 bool isImplicitCopyOrMove() const { 2638 switch (IIK) { 2639 case IIK_Copy: 2640 case IIK_Move: 2641 return true; 2642 2643 case IIK_Default: 2644 return false; 2645 } 2646 2647 return false; 2648 } 2649}; 2650} 2651 2652/// \brief Determine whether the given indirect field declaration is somewhere 2653/// within an anonymous union. 2654static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2655 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2656 CEnd = F->chain_end(); 2657 C != CEnd; ++C) 2658 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2659 if (Record->isUnion()) 2660 return true; 2661 2662 return false; 2663} 2664 2665/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2666/// array type. 2667static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2668 if (T->isIncompleteArrayType()) 2669 return true; 2670 2671 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2672 if (!ArrayT->getSize()) 2673 return true; 2674 2675 T = ArrayT->getElementType(); 2676 } 2677 2678 return false; 2679} 2680 2681static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2682 FieldDecl *Field, 2683 IndirectFieldDecl *Indirect = 0) { 2684 2685 // Overwhelmingly common case: we have a direct initializer for this field. 2686 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2687 Info.AllToInit.push_back(Init); 2688 return false; 2689 } 2690 2691 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2692 // has a brace-or-equal-initializer, the entity is initialized as specified 2693 // in [dcl.init]. 2694 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2695 CXXCtorInitializer *Init; 2696 if (Indirect) 2697 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2698 SourceLocation(), 2699 SourceLocation(), 0, 2700 SourceLocation()); 2701 else 2702 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2703 SourceLocation(), 2704 SourceLocation(), 0, 2705 SourceLocation()); 2706 Info.AllToInit.push_back(Init); 2707 return false; 2708 } 2709 2710 // Don't build an implicit initializer for union members if none was 2711 // explicitly specified. 2712 if (Field->getParent()->isUnion() || 2713 (Indirect && isWithinAnonymousUnion(Indirect))) 2714 return false; 2715 2716 // Don't initialize incomplete or zero-length arrays. 2717 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2718 return false; 2719 2720 // Don't try to build an implicit initializer if there were semantic 2721 // errors in any of the initializers (and therefore we might be 2722 // missing some that the user actually wrote). 2723 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2724 return false; 2725 2726 CXXCtorInitializer *Init = 0; 2727 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2728 Indirect, Init)) 2729 return true; 2730 2731 if (Init) 2732 Info.AllToInit.push_back(Init); 2733 2734 return false; 2735} 2736 2737bool 2738Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2739 CXXCtorInitializer *Initializer) { 2740 assert(Initializer->isDelegatingInitializer()); 2741 Constructor->setNumCtorInitializers(1); 2742 CXXCtorInitializer **initializer = 2743 new (Context) CXXCtorInitializer*[1]; 2744 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2745 Constructor->setCtorInitializers(initializer); 2746 2747 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2748 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2749 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2750 } 2751 2752 DelegatingCtorDecls.push_back(Constructor); 2753 2754 return false; 2755} 2756 2757bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2758 CXXCtorInitializer **Initializers, 2759 unsigned NumInitializers, 2760 bool AnyErrors) { 2761 if (Constructor->isDependentContext()) { 2762 // Just store the initializers as written, they will be checked during 2763 // instantiation. 2764 if (NumInitializers > 0) { 2765 Constructor->setNumCtorInitializers(NumInitializers); 2766 CXXCtorInitializer **baseOrMemberInitializers = 2767 new (Context) CXXCtorInitializer*[NumInitializers]; 2768 memcpy(baseOrMemberInitializers, Initializers, 2769 NumInitializers * sizeof(CXXCtorInitializer*)); 2770 Constructor->setCtorInitializers(baseOrMemberInitializers); 2771 } 2772 2773 return false; 2774 } 2775 2776 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2777 2778 // We need to build the initializer AST according to order of construction 2779 // and not what user specified in the Initializers list. 2780 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2781 if (!ClassDecl) 2782 return true; 2783 2784 bool HadError = false; 2785 2786 for (unsigned i = 0; i < NumInitializers; i++) { 2787 CXXCtorInitializer *Member = Initializers[i]; 2788 2789 if (Member->isBaseInitializer()) 2790 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2791 else 2792 Info.AllBaseFields[Member->getAnyMember()] = Member; 2793 } 2794 2795 // Keep track of the direct virtual bases. 2796 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2797 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2798 E = ClassDecl->bases_end(); I != E; ++I) { 2799 if (I->isVirtual()) 2800 DirectVBases.insert(I); 2801 } 2802 2803 // Push virtual bases before others. 2804 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2805 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2806 2807 if (CXXCtorInitializer *Value 2808 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2809 Info.AllToInit.push_back(Value); 2810 } else if (!AnyErrors) { 2811 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2812 CXXCtorInitializer *CXXBaseInit; 2813 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2814 VBase, IsInheritedVirtualBase, 2815 CXXBaseInit)) { 2816 HadError = true; 2817 continue; 2818 } 2819 2820 Info.AllToInit.push_back(CXXBaseInit); 2821 } 2822 } 2823 2824 // Non-virtual bases. 2825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2826 E = ClassDecl->bases_end(); Base != E; ++Base) { 2827 // Virtuals are in the virtual base list and already constructed. 2828 if (Base->isVirtual()) 2829 continue; 2830 2831 if (CXXCtorInitializer *Value 2832 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2833 Info.AllToInit.push_back(Value); 2834 } else if (!AnyErrors) { 2835 CXXCtorInitializer *CXXBaseInit; 2836 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2837 Base, /*IsInheritedVirtualBase=*/false, 2838 CXXBaseInit)) { 2839 HadError = true; 2840 continue; 2841 } 2842 2843 Info.AllToInit.push_back(CXXBaseInit); 2844 } 2845 } 2846 2847 // Fields. 2848 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2849 MemEnd = ClassDecl->decls_end(); 2850 Mem != MemEnd; ++Mem) { 2851 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2852 // C++ [class.bit]p2: 2853 // A declaration for a bit-field that omits the identifier declares an 2854 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2855 // initialized. 2856 if (F->isUnnamedBitfield()) 2857 continue; 2858 2859 // If we're not generating the implicit copy/move constructor, then we'll 2860 // handle anonymous struct/union fields based on their individual 2861 // indirect fields. 2862 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2863 continue; 2864 2865 if (CollectFieldInitializer(*this, Info, F)) 2866 HadError = true; 2867 continue; 2868 } 2869 2870 // Beyond this point, we only consider default initialization. 2871 if (Info.IIK != IIK_Default) 2872 continue; 2873 2874 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2875 if (F->getType()->isIncompleteArrayType()) { 2876 assert(ClassDecl->hasFlexibleArrayMember() && 2877 "Incomplete array type is not valid"); 2878 continue; 2879 } 2880 2881 // Initialize each field of an anonymous struct individually. 2882 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2883 HadError = true; 2884 2885 continue; 2886 } 2887 } 2888 2889 NumInitializers = Info.AllToInit.size(); 2890 if (NumInitializers > 0) { 2891 Constructor->setNumCtorInitializers(NumInitializers); 2892 CXXCtorInitializer **baseOrMemberInitializers = 2893 new (Context) CXXCtorInitializer*[NumInitializers]; 2894 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2895 NumInitializers * sizeof(CXXCtorInitializer*)); 2896 Constructor->setCtorInitializers(baseOrMemberInitializers); 2897 2898 // Constructors implicitly reference the base and member 2899 // destructors. 2900 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2901 Constructor->getParent()); 2902 } 2903 2904 return HadError; 2905} 2906 2907static void *GetKeyForTopLevelField(FieldDecl *Field) { 2908 // For anonymous unions, use the class declaration as the key. 2909 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2910 if (RT->getDecl()->isAnonymousStructOrUnion()) 2911 return static_cast<void *>(RT->getDecl()); 2912 } 2913 return static_cast<void *>(Field); 2914} 2915 2916static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2917 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2918} 2919 2920static void *GetKeyForMember(ASTContext &Context, 2921 CXXCtorInitializer *Member) { 2922 if (!Member->isAnyMemberInitializer()) 2923 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2924 2925 // For fields injected into the class via declaration of an anonymous union, 2926 // use its anonymous union class declaration as the unique key. 2927 FieldDecl *Field = Member->getAnyMember(); 2928 2929 // If the field is a member of an anonymous struct or union, our key 2930 // is the anonymous record decl that's a direct child of the class. 2931 RecordDecl *RD = Field->getParent(); 2932 if (RD->isAnonymousStructOrUnion()) { 2933 while (true) { 2934 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2935 if (Parent->isAnonymousStructOrUnion()) 2936 RD = Parent; 2937 else 2938 break; 2939 } 2940 2941 return static_cast<void *>(RD); 2942 } 2943 2944 return static_cast<void *>(Field); 2945} 2946 2947static void 2948DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2949 const CXXConstructorDecl *Constructor, 2950 CXXCtorInitializer **Inits, 2951 unsigned NumInits) { 2952 if (Constructor->getDeclContext()->isDependentContext()) 2953 return; 2954 2955 // Don't check initializers order unless the warning is enabled at the 2956 // location of at least one initializer. 2957 bool ShouldCheckOrder = false; 2958 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2959 CXXCtorInitializer *Init = Inits[InitIndex]; 2960 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2961 Init->getSourceLocation()) 2962 != DiagnosticsEngine::Ignored) { 2963 ShouldCheckOrder = true; 2964 break; 2965 } 2966 } 2967 if (!ShouldCheckOrder) 2968 return; 2969 2970 // Build the list of bases and members in the order that they'll 2971 // actually be initialized. The explicit initializers should be in 2972 // this same order but may be missing things. 2973 SmallVector<const void*, 32> IdealInitKeys; 2974 2975 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2976 2977 // 1. Virtual bases. 2978 for (CXXRecordDecl::base_class_const_iterator VBase = 2979 ClassDecl->vbases_begin(), 2980 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2981 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2982 2983 // 2. Non-virtual bases. 2984 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2985 E = ClassDecl->bases_end(); Base != E; ++Base) { 2986 if (Base->isVirtual()) 2987 continue; 2988 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2989 } 2990 2991 // 3. Direct fields. 2992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2993 E = ClassDecl->field_end(); Field != E; ++Field) { 2994 if (Field->isUnnamedBitfield()) 2995 continue; 2996 2997 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2998 } 2999 3000 unsigned NumIdealInits = IdealInitKeys.size(); 3001 unsigned IdealIndex = 0; 3002 3003 CXXCtorInitializer *PrevInit = 0; 3004 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3005 CXXCtorInitializer *Init = Inits[InitIndex]; 3006 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3007 3008 // Scan forward to try to find this initializer in the idealized 3009 // initializers list. 3010 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3011 if (InitKey == IdealInitKeys[IdealIndex]) 3012 break; 3013 3014 // If we didn't find this initializer, it must be because we 3015 // scanned past it on a previous iteration. That can only 3016 // happen if we're out of order; emit a warning. 3017 if (IdealIndex == NumIdealInits && PrevInit) { 3018 Sema::SemaDiagnosticBuilder D = 3019 SemaRef.Diag(PrevInit->getSourceLocation(), 3020 diag::warn_initializer_out_of_order); 3021 3022 if (PrevInit->isAnyMemberInitializer()) 3023 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3024 else 3025 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3026 3027 if (Init->isAnyMemberInitializer()) 3028 D << 0 << Init->getAnyMember()->getDeclName(); 3029 else 3030 D << 1 << Init->getTypeSourceInfo()->getType(); 3031 3032 // Move back to the initializer's location in the ideal list. 3033 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3034 if (InitKey == IdealInitKeys[IdealIndex]) 3035 break; 3036 3037 assert(IdealIndex != NumIdealInits && 3038 "initializer not found in initializer list"); 3039 } 3040 3041 PrevInit = Init; 3042 } 3043} 3044 3045namespace { 3046bool CheckRedundantInit(Sema &S, 3047 CXXCtorInitializer *Init, 3048 CXXCtorInitializer *&PrevInit) { 3049 if (!PrevInit) { 3050 PrevInit = Init; 3051 return false; 3052 } 3053 3054 if (FieldDecl *Field = Init->getMember()) 3055 S.Diag(Init->getSourceLocation(), 3056 diag::err_multiple_mem_initialization) 3057 << Field->getDeclName() 3058 << Init->getSourceRange(); 3059 else { 3060 const Type *BaseClass = Init->getBaseClass(); 3061 assert(BaseClass && "neither field nor base"); 3062 S.Diag(Init->getSourceLocation(), 3063 diag::err_multiple_base_initialization) 3064 << QualType(BaseClass, 0) 3065 << Init->getSourceRange(); 3066 } 3067 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3068 << 0 << PrevInit->getSourceRange(); 3069 3070 return true; 3071} 3072 3073typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3074typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3075 3076bool CheckRedundantUnionInit(Sema &S, 3077 CXXCtorInitializer *Init, 3078 RedundantUnionMap &Unions) { 3079 FieldDecl *Field = Init->getAnyMember(); 3080 RecordDecl *Parent = Field->getParent(); 3081 NamedDecl *Child = Field; 3082 3083 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3084 if (Parent->isUnion()) { 3085 UnionEntry &En = Unions[Parent]; 3086 if (En.first && En.first != Child) { 3087 S.Diag(Init->getSourceLocation(), 3088 diag::err_multiple_mem_union_initialization) 3089 << Field->getDeclName() 3090 << Init->getSourceRange(); 3091 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3092 << 0 << En.second->getSourceRange(); 3093 return true; 3094 } 3095 if (!En.first) { 3096 En.first = Child; 3097 En.second = Init; 3098 } 3099 if (!Parent->isAnonymousStructOrUnion()) 3100 return false; 3101 } 3102 3103 Child = Parent; 3104 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3105 } 3106 3107 return false; 3108} 3109} 3110 3111/// ActOnMemInitializers - Handle the member initializers for a constructor. 3112void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3113 SourceLocation ColonLoc, 3114 CXXCtorInitializer **meminits, 3115 unsigned NumMemInits, 3116 bool AnyErrors) { 3117 if (!ConstructorDecl) 3118 return; 3119 3120 AdjustDeclIfTemplate(ConstructorDecl); 3121 3122 CXXConstructorDecl *Constructor 3123 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3124 3125 if (!Constructor) { 3126 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3127 return; 3128 } 3129 3130 CXXCtorInitializer **MemInits = 3131 reinterpret_cast<CXXCtorInitializer **>(meminits); 3132 3133 // Mapping for the duplicate initializers check. 3134 // For member initializers, this is keyed with a FieldDecl*. 3135 // For base initializers, this is keyed with a Type*. 3136 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3137 3138 // Mapping for the inconsistent anonymous-union initializers check. 3139 RedundantUnionMap MemberUnions; 3140 3141 bool HadError = false; 3142 for (unsigned i = 0; i < NumMemInits; i++) { 3143 CXXCtorInitializer *Init = MemInits[i]; 3144 3145 // Set the source order index. 3146 Init->setSourceOrder(i); 3147 3148 if (Init->isAnyMemberInitializer()) { 3149 FieldDecl *Field = Init->getAnyMember(); 3150 if (CheckRedundantInit(*this, Init, Members[Field]) || 3151 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3152 HadError = true; 3153 } else if (Init->isBaseInitializer()) { 3154 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3155 if (CheckRedundantInit(*this, Init, Members[Key])) 3156 HadError = true; 3157 } else { 3158 assert(Init->isDelegatingInitializer()); 3159 // This must be the only initializer 3160 if (i != 0 || NumMemInits > 1) { 3161 Diag(MemInits[0]->getSourceLocation(), 3162 diag::err_delegating_initializer_alone) 3163 << MemInits[0]->getSourceRange(); 3164 HadError = true; 3165 // We will treat this as being the only initializer. 3166 } 3167 SetDelegatingInitializer(Constructor, MemInits[i]); 3168 // Return immediately as the initializer is set. 3169 return; 3170 } 3171 } 3172 3173 if (HadError) 3174 return; 3175 3176 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3177 3178 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3179} 3180 3181void 3182Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3183 CXXRecordDecl *ClassDecl) { 3184 // Ignore dependent contexts. Also ignore unions, since their members never 3185 // have destructors implicitly called. 3186 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3187 return; 3188 3189 // FIXME: all the access-control diagnostics are positioned on the 3190 // field/base declaration. That's probably good; that said, the 3191 // user might reasonably want to know why the destructor is being 3192 // emitted, and we currently don't say. 3193 3194 // Non-static data members. 3195 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3196 E = ClassDecl->field_end(); I != E; ++I) { 3197 FieldDecl *Field = *I; 3198 if (Field->isInvalidDecl()) 3199 continue; 3200 3201 // Don't destroy incomplete or zero-length arrays. 3202 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3203 continue; 3204 3205 QualType FieldType = Context.getBaseElementType(Field->getType()); 3206 3207 const RecordType* RT = FieldType->getAs<RecordType>(); 3208 if (!RT) 3209 continue; 3210 3211 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3212 if (FieldClassDecl->isInvalidDecl()) 3213 continue; 3214 if (FieldClassDecl->hasTrivialDestructor()) 3215 continue; 3216 3217 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3218 assert(Dtor && "No dtor found for FieldClassDecl!"); 3219 CheckDestructorAccess(Field->getLocation(), Dtor, 3220 PDiag(diag::err_access_dtor_field) 3221 << Field->getDeclName() 3222 << FieldType); 3223 3224 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3225 } 3226 3227 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3228 3229 // Bases. 3230 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3231 E = ClassDecl->bases_end(); Base != E; ++Base) { 3232 // Bases are always records in a well-formed non-dependent class. 3233 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3234 3235 // Remember direct virtual bases. 3236 if (Base->isVirtual()) 3237 DirectVirtualBases.insert(RT); 3238 3239 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3240 // If our base class is invalid, we probably can't get its dtor anyway. 3241 if (BaseClassDecl->isInvalidDecl()) 3242 continue; 3243 // Ignore trivial destructors. 3244 if (BaseClassDecl->hasTrivialDestructor()) 3245 continue; 3246 3247 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3248 assert(Dtor && "No dtor found for BaseClassDecl!"); 3249 3250 // FIXME: caret should be on the start of the class name 3251 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3252 PDiag(diag::err_access_dtor_base) 3253 << Base->getType() 3254 << Base->getSourceRange()); 3255 3256 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3257 } 3258 3259 // Virtual bases. 3260 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3261 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3262 3263 // Bases are always records in a well-formed non-dependent class. 3264 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3265 3266 // Ignore direct virtual bases. 3267 if (DirectVirtualBases.count(RT)) 3268 continue; 3269 3270 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3271 // If our base class is invalid, we probably can't get its dtor anyway. 3272 if (BaseClassDecl->isInvalidDecl()) 3273 continue; 3274 // Ignore trivial destructors. 3275 if (BaseClassDecl->hasTrivialDestructor()) 3276 continue; 3277 3278 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3279 assert(Dtor && "No dtor found for BaseClassDecl!"); 3280 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3281 PDiag(diag::err_access_dtor_vbase) 3282 << VBase->getType()); 3283 3284 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3285 } 3286} 3287 3288void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3289 if (!CDtorDecl) 3290 return; 3291 3292 if (CXXConstructorDecl *Constructor 3293 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3294 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3295} 3296 3297bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3298 unsigned DiagID, AbstractDiagSelID SelID) { 3299 if (SelID == -1) 3300 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3301 else 3302 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3303} 3304 3305bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3306 const PartialDiagnostic &PD) { 3307 if (!getLangOptions().CPlusPlus) 3308 return false; 3309 3310 if (const ArrayType *AT = Context.getAsArrayType(T)) 3311 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3312 3313 if (const PointerType *PT = T->getAs<PointerType>()) { 3314 // Find the innermost pointer type. 3315 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3316 PT = T; 3317 3318 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3319 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3320 } 3321 3322 const RecordType *RT = T->getAs<RecordType>(); 3323 if (!RT) 3324 return false; 3325 3326 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3327 3328 // We can't answer whether something is abstract until it has a 3329 // definition. If it's currently being defined, we'll walk back 3330 // over all the declarations when we have a full definition. 3331 const CXXRecordDecl *Def = RD->getDefinition(); 3332 if (!Def || Def->isBeingDefined()) 3333 return false; 3334 3335 if (!RD->isAbstract()) 3336 return false; 3337 3338 Diag(Loc, PD) << RD->getDeclName(); 3339 DiagnoseAbstractType(RD); 3340 3341 return true; 3342} 3343 3344void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3345 // Check if we've already emitted the list of pure virtual functions 3346 // for this class. 3347 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3348 return; 3349 3350 CXXFinalOverriderMap FinalOverriders; 3351 RD->getFinalOverriders(FinalOverriders); 3352 3353 // Keep a set of seen pure methods so we won't diagnose the same method 3354 // more than once. 3355 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3356 3357 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3358 MEnd = FinalOverriders.end(); 3359 M != MEnd; 3360 ++M) { 3361 for (OverridingMethods::iterator SO = M->second.begin(), 3362 SOEnd = M->second.end(); 3363 SO != SOEnd; ++SO) { 3364 // C++ [class.abstract]p4: 3365 // A class is abstract if it contains or inherits at least one 3366 // pure virtual function for which the final overrider is pure 3367 // virtual. 3368 3369 // 3370 if (SO->second.size() != 1) 3371 continue; 3372 3373 if (!SO->second.front().Method->isPure()) 3374 continue; 3375 3376 if (!SeenPureMethods.insert(SO->second.front().Method)) 3377 continue; 3378 3379 Diag(SO->second.front().Method->getLocation(), 3380 diag::note_pure_virtual_function) 3381 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3382 } 3383 } 3384 3385 if (!PureVirtualClassDiagSet) 3386 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3387 PureVirtualClassDiagSet->insert(RD); 3388} 3389 3390namespace { 3391struct AbstractUsageInfo { 3392 Sema &S; 3393 CXXRecordDecl *Record; 3394 CanQualType AbstractType; 3395 bool Invalid; 3396 3397 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3398 : S(S), Record(Record), 3399 AbstractType(S.Context.getCanonicalType( 3400 S.Context.getTypeDeclType(Record))), 3401 Invalid(false) {} 3402 3403 void DiagnoseAbstractType() { 3404 if (Invalid) return; 3405 S.DiagnoseAbstractType(Record); 3406 Invalid = true; 3407 } 3408 3409 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3410}; 3411 3412struct CheckAbstractUsage { 3413 AbstractUsageInfo &Info; 3414 const NamedDecl *Ctx; 3415 3416 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3417 : Info(Info), Ctx(Ctx) {} 3418 3419 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3420 switch (TL.getTypeLocClass()) { 3421#define ABSTRACT_TYPELOC(CLASS, PARENT) 3422#define TYPELOC(CLASS, PARENT) \ 3423 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3424#include "clang/AST/TypeLocNodes.def" 3425 } 3426 } 3427 3428 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3429 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3430 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3431 if (!TL.getArg(I)) 3432 continue; 3433 3434 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3435 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3436 } 3437 } 3438 3439 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3440 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3441 } 3442 3443 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3444 // Visit the type parameters from a permissive context. 3445 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3446 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3447 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3448 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3449 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3450 // TODO: other template argument types? 3451 } 3452 } 3453 3454 // Visit pointee types from a permissive context. 3455#define CheckPolymorphic(Type) \ 3456 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3457 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3458 } 3459 CheckPolymorphic(PointerTypeLoc) 3460 CheckPolymorphic(ReferenceTypeLoc) 3461 CheckPolymorphic(MemberPointerTypeLoc) 3462 CheckPolymorphic(BlockPointerTypeLoc) 3463 CheckPolymorphic(AtomicTypeLoc) 3464 3465 /// Handle all the types we haven't given a more specific 3466 /// implementation for above. 3467 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3468 // Every other kind of type that we haven't called out already 3469 // that has an inner type is either (1) sugar or (2) contains that 3470 // inner type in some way as a subobject. 3471 if (TypeLoc Next = TL.getNextTypeLoc()) 3472 return Visit(Next, Sel); 3473 3474 // If there's no inner type and we're in a permissive context, 3475 // don't diagnose. 3476 if (Sel == Sema::AbstractNone) return; 3477 3478 // Check whether the type matches the abstract type. 3479 QualType T = TL.getType(); 3480 if (T->isArrayType()) { 3481 Sel = Sema::AbstractArrayType; 3482 T = Info.S.Context.getBaseElementType(T); 3483 } 3484 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3485 if (CT != Info.AbstractType) return; 3486 3487 // It matched; do some magic. 3488 if (Sel == Sema::AbstractArrayType) { 3489 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3490 << T << TL.getSourceRange(); 3491 } else { 3492 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3493 << Sel << T << TL.getSourceRange(); 3494 } 3495 Info.DiagnoseAbstractType(); 3496 } 3497}; 3498 3499void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3500 Sema::AbstractDiagSelID Sel) { 3501 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3502} 3503 3504} 3505 3506/// Check for invalid uses of an abstract type in a method declaration. 3507static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3508 CXXMethodDecl *MD) { 3509 // No need to do the check on definitions, which require that 3510 // the return/param types be complete. 3511 if (MD->doesThisDeclarationHaveABody()) 3512 return; 3513 3514 // For safety's sake, just ignore it if we don't have type source 3515 // information. This should never happen for non-implicit methods, 3516 // but... 3517 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3518 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3519} 3520 3521/// Check for invalid uses of an abstract type within a class definition. 3522static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3523 CXXRecordDecl *RD) { 3524 for (CXXRecordDecl::decl_iterator 3525 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3526 Decl *D = *I; 3527 if (D->isImplicit()) continue; 3528 3529 // Methods and method templates. 3530 if (isa<CXXMethodDecl>(D)) { 3531 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3532 } else if (isa<FunctionTemplateDecl>(D)) { 3533 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3534 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3535 3536 // Fields and static variables. 3537 } else if (isa<FieldDecl>(D)) { 3538 FieldDecl *FD = cast<FieldDecl>(D); 3539 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3540 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3541 } else if (isa<VarDecl>(D)) { 3542 VarDecl *VD = cast<VarDecl>(D); 3543 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3544 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3545 3546 // Nested classes and class templates. 3547 } else if (isa<CXXRecordDecl>(D)) { 3548 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3549 } else if (isa<ClassTemplateDecl>(D)) { 3550 CheckAbstractClassUsage(Info, 3551 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3552 } 3553 } 3554} 3555 3556/// \brief Perform semantic checks on a class definition that has been 3557/// completing, introducing implicitly-declared members, checking for 3558/// abstract types, etc. 3559void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3560 if (!Record) 3561 return; 3562 3563 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3564 AbstractUsageInfo Info(*this, Record); 3565 CheckAbstractClassUsage(Info, Record); 3566 } 3567 3568 // If this is not an aggregate type and has no user-declared constructor, 3569 // complain about any non-static data members of reference or const scalar 3570 // type, since they will never get initializers. 3571 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3572 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3573 bool Complained = false; 3574 for (RecordDecl::field_iterator F = Record->field_begin(), 3575 FEnd = Record->field_end(); 3576 F != FEnd; ++F) { 3577 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3578 continue; 3579 3580 if (F->getType()->isReferenceType() || 3581 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3582 if (!Complained) { 3583 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3584 << Record->getTagKind() << Record; 3585 Complained = true; 3586 } 3587 3588 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3589 << F->getType()->isReferenceType() 3590 << F->getDeclName(); 3591 } 3592 } 3593 } 3594 3595 if (Record->isDynamicClass() && !Record->isDependentType()) 3596 DynamicClasses.push_back(Record); 3597 3598 if (Record->getIdentifier()) { 3599 // C++ [class.mem]p13: 3600 // If T is the name of a class, then each of the following shall have a 3601 // name different from T: 3602 // - every member of every anonymous union that is a member of class T. 3603 // 3604 // C++ [class.mem]p14: 3605 // In addition, if class T has a user-declared constructor (12.1), every 3606 // non-static data member of class T shall have a name different from T. 3607 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3608 R.first != R.second; ++R.first) { 3609 NamedDecl *D = *R.first; 3610 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3611 isa<IndirectFieldDecl>(D)) { 3612 Diag(D->getLocation(), diag::err_member_name_of_class) 3613 << D->getDeclName(); 3614 break; 3615 } 3616 } 3617 } 3618 3619 // Warn if the class has virtual methods but non-virtual public destructor. 3620 if (Record->isPolymorphic() && !Record->isDependentType()) { 3621 CXXDestructorDecl *dtor = Record->getDestructor(); 3622 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3623 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3624 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3625 } 3626 3627 // See if a method overloads virtual methods in a base 3628 /// class without overriding any. 3629 if (!Record->isDependentType()) { 3630 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3631 MEnd = Record->method_end(); 3632 M != MEnd; ++M) { 3633 if (!(*M)->isStatic()) 3634 DiagnoseHiddenVirtualMethods(Record, *M); 3635 } 3636 } 3637 3638 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3639 // function that is not a constructor declares that member function to be 3640 // const. [...] The class of which that function is a member shall be 3641 // a literal type. 3642 // 3643 // It's fine to diagnose constructors here too: such constructors cannot 3644 // produce a constant expression, so are ill-formed (no diagnostic required). 3645 // 3646 // If the class has virtual bases, any constexpr members will already have 3647 // been diagnosed by the checks performed on the member declaration, so 3648 // suppress this (less useful) diagnostic. 3649 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3650 !Record->isLiteral() && !Record->getNumVBases()) { 3651 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3652 MEnd = Record->method_end(); 3653 M != MEnd; ++M) { 3654 if ((*M)->isConstexpr()) { 3655 switch (Record->getTemplateSpecializationKind()) { 3656 case TSK_ImplicitInstantiation: 3657 case TSK_ExplicitInstantiationDeclaration: 3658 case TSK_ExplicitInstantiationDefinition: 3659 // If a template instantiates to a non-literal type, but its members 3660 // instantiate to constexpr functions, the template is technically 3661 // ill-formed, but we allow it for sanity. Such members are treated as 3662 // non-constexpr. 3663 (*M)->setConstexpr(false); 3664 continue; 3665 3666 case TSK_Undeclared: 3667 case TSK_ExplicitSpecialization: 3668 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3669 PDiag(diag::err_constexpr_method_non_literal)); 3670 break; 3671 } 3672 3673 // Only produce one error per class. 3674 break; 3675 } 3676 } 3677 } 3678 3679 // Declare inherited constructors. We do this eagerly here because: 3680 // - The standard requires an eager diagnostic for conflicting inherited 3681 // constructors from different classes. 3682 // - The lazy declaration of the other implicit constructors is so as to not 3683 // waste space and performance on classes that are not meant to be 3684 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3685 // have inherited constructors. 3686 DeclareInheritedConstructors(Record); 3687 3688 if (!Record->isDependentType()) 3689 CheckExplicitlyDefaultedMethods(Record); 3690} 3691 3692void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3693 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3694 ME = Record->method_end(); 3695 MI != ME; ++MI) { 3696 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3697 switch (getSpecialMember(*MI)) { 3698 case CXXDefaultConstructor: 3699 CheckExplicitlyDefaultedDefaultConstructor( 3700 cast<CXXConstructorDecl>(*MI)); 3701 break; 3702 3703 case CXXDestructor: 3704 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3705 break; 3706 3707 case CXXCopyConstructor: 3708 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3709 break; 3710 3711 case CXXCopyAssignment: 3712 CheckExplicitlyDefaultedCopyAssignment(*MI); 3713 break; 3714 3715 case CXXMoveConstructor: 3716 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3717 break; 3718 3719 case CXXMoveAssignment: 3720 CheckExplicitlyDefaultedMoveAssignment(*MI); 3721 break; 3722 3723 case CXXInvalid: 3724 llvm_unreachable("non-special member explicitly defaulted!"); 3725 } 3726 } 3727 } 3728 3729} 3730 3731void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3732 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3733 3734 // Whether this was the first-declared instance of the constructor. 3735 // This affects whether we implicitly add an exception spec (and, eventually, 3736 // constexpr). It is also ill-formed to explicitly default a constructor such 3737 // that it would be deleted. (C++0x [decl.fct.def.default]) 3738 bool First = CD == CD->getCanonicalDecl(); 3739 3740 bool HadError = false; 3741 if (CD->getNumParams() != 0) { 3742 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3743 << CD->getSourceRange(); 3744 HadError = true; 3745 } 3746 3747 ImplicitExceptionSpecification Spec 3748 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3749 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3750 if (EPI.ExceptionSpecType == EST_Delayed) { 3751 // Exception specification depends on some deferred part of the class. We'll 3752 // try again when the class's definition has been fully processed. 3753 return; 3754 } 3755 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3756 *ExceptionType = Context.getFunctionType( 3757 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3758 3759 if (CtorType->hasExceptionSpec()) { 3760 if (CheckEquivalentExceptionSpec( 3761 PDiag(diag::err_incorrect_defaulted_exception_spec) 3762 << CXXDefaultConstructor, 3763 PDiag(), 3764 ExceptionType, SourceLocation(), 3765 CtorType, CD->getLocation())) { 3766 HadError = true; 3767 } 3768 } else if (First) { 3769 // We set the declaration to have the computed exception spec here. 3770 // We know there are no parameters. 3771 EPI.ExtInfo = CtorType->getExtInfo(); 3772 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3773 } 3774 3775 if (HadError) { 3776 CD->setInvalidDecl(); 3777 return; 3778 } 3779 3780 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3781 if (First) { 3782 CD->setDeletedAsWritten(); 3783 } else { 3784 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3785 << CXXDefaultConstructor; 3786 CD->setInvalidDecl(); 3787 } 3788 } 3789} 3790 3791void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3792 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3793 3794 // Whether this was the first-declared instance of the constructor. 3795 bool First = CD == CD->getCanonicalDecl(); 3796 3797 bool HadError = false; 3798 if (CD->getNumParams() != 1) { 3799 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3800 << CD->getSourceRange(); 3801 HadError = true; 3802 } 3803 3804 ImplicitExceptionSpecification Spec(Context); 3805 bool Const; 3806 llvm::tie(Spec, Const) = 3807 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3808 3809 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3810 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3811 *ExceptionType = Context.getFunctionType( 3812 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3813 3814 // Check for parameter type matching. 3815 // This is a copy ctor so we know it's a cv-qualified reference to T. 3816 QualType ArgType = CtorType->getArgType(0); 3817 if (ArgType->getPointeeType().isVolatileQualified()) { 3818 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3819 HadError = true; 3820 } 3821 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3822 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3823 HadError = true; 3824 } 3825 3826 if (CtorType->hasExceptionSpec()) { 3827 if (CheckEquivalentExceptionSpec( 3828 PDiag(diag::err_incorrect_defaulted_exception_spec) 3829 << CXXCopyConstructor, 3830 PDiag(), 3831 ExceptionType, SourceLocation(), 3832 CtorType, CD->getLocation())) { 3833 HadError = true; 3834 } 3835 } else if (First) { 3836 // We set the declaration to have the computed exception spec here. 3837 // We duplicate the one parameter type. 3838 EPI.ExtInfo = CtorType->getExtInfo(); 3839 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3840 } 3841 3842 if (HadError) { 3843 CD->setInvalidDecl(); 3844 return; 3845 } 3846 3847 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3848 if (First) { 3849 CD->setDeletedAsWritten(); 3850 } else { 3851 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3852 << CXXCopyConstructor; 3853 CD->setInvalidDecl(); 3854 } 3855 } 3856} 3857 3858void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3859 assert(MD->isExplicitlyDefaulted()); 3860 3861 // Whether this was the first-declared instance of the operator 3862 bool First = MD == MD->getCanonicalDecl(); 3863 3864 bool HadError = false; 3865 if (MD->getNumParams() != 1) { 3866 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3867 << MD->getSourceRange(); 3868 HadError = true; 3869 } 3870 3871 QualType ReturnType = 3872 MD->getType()->getAs<FunctionType>()->getResultType(); 3873 if (!ReturnType->isLValueReferenceType() || 3874 !Context.hasSameType( 3875 Context.getCanonicalType(ReturnType->getPointeeType()), 3876 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3877 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3878 HadError = true; 3879 } 3880 3881 ImplicitExceptionSpecification Spec(Context); 3882 bool Const; 3883 llvm::tie(Spec, Const) = 3884 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3885 3886 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3887 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3888 *ExceptionType = Context.getFunctionType( 3889 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3890 3891 QualType ArgType = OperType->getArgType(0); 3892 if (!ArgType->isLValueReferenceType()) { 3893 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3894 HadError = true; 3895 } else { 3896 if (ArgType->getPointeeType().isVolatileQualified()) { 3897 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3898 HadError = true; 3899 } 3900 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3901 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3902 HadError = true; 3903 } 3904 } 3905 3906 if (OperType->getTypeQuals()) { 3907 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3908 HadError = true; 3909 } 3910 3911 if (OperType->hasExceptionSpec()) { 3912 if (CheckEquivalentExceptionSpec( 3913 PDiag(diag::err_incorrect_defaulted_exception_spec) 3914 << CXXCopyAssignment, 3915 PDiag(), 3916 ExceptionType, SourceLocation(), 3917 OperType, MD->getLocation())) { 3918 HadError = true; 3919 } 3920 } else if (First) { 3921 // We set the declaration to have the computed exception spec here. 3922 // We duplicate the one parameter type. 3923 EPI.RefQualifier = OperType->getRefQualifier(); 3924 EPI.ExtInfo = OperType->getExtInfo(); 3925 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3926 } 3927 3928 if (HadError) { 3929 MD->setInvalidDecl(); 3930 return; 3931 } 3932 3933 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3934 if (First) { 3935 MD->setDeletedAsWritten(); 3936 } else { 3937 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3938 << CXXCopyAssignment; 3939 MD->setInvalidDecl(); 3940 } 3941 } 3942} 3943 3944void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3945 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3946 3947 // Whether this was the first-declared instance of the constructor. 3948 bool First = CD == CD->getCanonicalDecl(); 3949 3950 bool HadError = false; 3951 if (CD->getNumParams() != 1) { 3952 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3953 << CD->getSourceRange(); 3954 HadError = true; 3955 } 3956 3957 ImplicitExceptionSpecification Spec( 3958 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3959 3960 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3961 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3962 *ExceptionType = Context.getFunctionType( 3963 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3964 3965 // Check for parameter type matching. 3966 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3967 QualType ArgType = CtorType->getArgType(0); 3968 if (ArgType->getPointeeType().isVolatileQualified()) { 3969 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3970 HadError = true; 3971 } 3972 if (ArgType->getPointeeType().isConstQualified()) { 3973 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3974 HadError = true; 3975 } 3976 3977 if (CtorType->hasExceptionSpec()) { 3978 if (CheckEquivalentExceptionSpec( 3979 PDiag(diag::err_incorrect_defaulted_exception_spec) 3980 << CXXMoveConstructor, 3981 PDiag(), 3982 ExceptionType, SourceLocation(), 3983 CtorType, CD->getLocation())) { 3984 HadError = true; 3985 } 3986 } else if (First) { 3987 // We set the declaration to have the computed exception spec here. 3988 // We duplicate the one parameter type. 3989 EPI.ExtInfo = CtorType->getExtInfo(); 3990 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3991 } 3992 3993 if (HadError) { 3994 CD->setInvalidDecl(); 3995 return; 3996 } 3997 3998 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3999 if (First) { 4000 CD->setDeletedAsWritten(); 4001 } else { 4002 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4003 << CXXMoveConstructor; 4004 CD->setInvalidDecl(); 4005 } 4006 } 4007} 4008 4009void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4010 assert(MD->isExplicitlyDefaulted()); 4011 4012 // Whether this was the first-declared instance of the operator 4013 bool First = MD == MD->getCanonicalDecl(); 4014 4015 bool HadError = false; 4016 if (MD->getNumParams() != 1) { 4017 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4018 << MD->getSourceRange(); 4019 HadError = true; 4020 } 4021 4022 QualType ReturnType = 4023 MD->getType()->getAs<FunctionType>()->getResultType(); 4024 if (!ReturnType->isLValueReferenceType() || 4025 !Context.hasSameType( 4026 Context.getCanonicalType(ReturnType->getPointeeType()), 4027 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4028 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4029 HadError = true; 4030 } 4031 4032 ImplicitExceptionSpecification Spec( 4033 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4034 4035 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4036 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4037 *ExceptionType = Context.getFunctionType( 4038 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4039 4040 QualType ArgType = OperType->getArgType(0); 4041 if (!ArgType->isRValueReferenceType()) { 4042 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4043 HadError = true; 4044 } else { 4045 if (ArgType->getPointeeType().isVolatileQualified()) { 4046 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4047 HadError = true; 4048 } 4049 if (ArgType->getPointeeType().isConstQualified()) { 4050 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4051 HadError = true; 4052 } 4053 } 4054 4055 if (OperType->getTypeQuals()) { 4056 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4057 HadError = true; 4058 } 4059 4060 if (OperType->hasExceptionSpec()) { 4061 if (CheckEquivalentExceptionSpec( 4062 PDiag(diag::err_incorrect_defaulted_exception_spec) 4063 << CXXMoveAssignment, 4064 PDiag(), 4065 ExceptionType, SourceLocation(), 4066 OperType, MD->getLocation())) { 4067 HadError = true; 4068 } 4069 } else if (First) { 4070 // We set the declaration to have the computed exception spec here. 4071 // We duplicate the one parameter type. 4072 EPI.RefQualifier = OperType->getRefQualifier(); 4073 EPI.ExtInfo = OperType->getExtInfo(); 4074 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4075 } 4076 4077 if (HadError) { 4078 MD->setInvalidDecl(); 4079 return; 4080 } 4081 4082 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4083 if (First) { 4084 MD->setDeletedAsWritten(); 4085 } else { 4086 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4087 << CXXMoveAssignment; 4088 MD->setInvalidDecl(); 4089 } 4090 } 4091} 4092 4093void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4094 assert(DD->isExplicitlyDefaulted()); 4095 4096 // Whether this was the first-declared instance of the destructor. 4097 bool First = DD == DD->getCanonicalDecl(); 4098 4099 ImplicitExceptionSpecification Spec 4100 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4101 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4102 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4103 *ExceptionType = Context.getFunctionType( 4104 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4105 4106 if (DtorType->hasExceptionSpec()) { 4107 if (CheckEquivalentExceptionSpec( 4108 PDiag(diag::err_incorrect_defaulted_exception_spec) 4109 << CXXDestructor, 4110 PDiag(), 4111 ExceptionType, SourceLocation(), 4112 DtorType, DD->getLocation())) { 4113 DD->setInvalidDecl(); 4114 return; 4115 } 4116 } else if (First) { 4117 // We set the declaration to have the computed exception spec here. 4118 // There are no parameters. 4119 EPI.ExtInfo = DtorType->getExtInfo(); 4120 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4121 } 4122 4123 if (ShouldDeleteDestructor(DD)) { 4124 if (First) { 4125 DD->setDeletedAsWritten(); 4126 } else { 4127 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4128 << CXXDestructor; 4129 DD->setInvalidDecl(); 4130 } 4131 } 4132} 4133 4134/// This function implements the following C++0x paragraphs: 4135/// - [class.ctor]/5 4136/// - [class.copy]/11 4137bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4138 assert(!MD->isInvalidDecl()); 4139 CXXRecordDecl *RD = MD->getParent(); 4140 assert(!RD->isDependentType() && "do deletion after instantiation"); 4141 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4142 return false; 4143 4144 bool IsUnion = RD->isUnion(); 4145 bool IsConstructor = false; 4146 bool IsAssignment = false; 4147 bool IsMove = false; 4148 4149 bool ConstArg = false; 4150 4151 switch (CSM) { 4152 case CXXDefaultConstructor: 4153 IsConstructor = true; 4154 break; 4155 case CXXCopyConstructor: 4156 IsConstructor = true; 4157 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4158 break; 4159 case CXXMoveConstructor: 4160 IsConstructor = true; 4161 IsMove = true; 4162 break; 4163 default: 4164 llvm_unreachable("function only currently implemented for default ctors"); 4165 } 4166 4167 SourceLocation Loc = MD->getLocation(); 4168 4169 // Do access control from the special member function 4170 ContextRAII MethodContext(*this, MD); 4171 4172 bool AllConst = true; 4173 4174 // We do this because we should never actually use an anonymous 4175 // union's constructor. 4176 if (IsUnion && RD->isAnonymousStructOrUnion()) 4177 return false; 4178 4179 // FIXME: We should put some diagnostic logic right into this function. 4180 4181 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4182 BE = RD->bases_end(); 4183 BI != BE; ++BI) { 4184 // We'll handle this one later 4185 if (BI->isVirtual()) 4186 continue; 4187 4188 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4189 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4190 4191 // Unless we have an assignment operator, the base's destructor must 4192 // be accessible and not deleted. 4193 if (!IsAssignment) { 4194 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4195 if (BaseDtor->isDeleted()) 4196 return true; 4197 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4198 AR_accessible) 4199 return true; 4200 } 4201 4202 // Finding the corresponding member in the base should lead to a 4203 // unique, accessible, non-deleted function. If we are doing 4204 // a destructor, we have already checked this case. 4205 if (CSM != CXXDestructor) { 4206 SpecialMemberOverloadResult *SMOR = 4207 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4208 false); 4209 if (!SMOR->hasSuccess()) 4210 return true; 4211 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4212 if (IsConstructor) { 4213 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4214 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4215 PDiag()) != AR_accessible) 4216 return true; 4217 4218 // For a move operation, the corresponding operation must actually 4219 // be a move operation (and not a copy selected by overload 4220 // resolution) unless we are working on a trivially copyable class. 4221 if (IsMove && !BaseCtor->isMoveConstructor() && 4222 !BaseDecl->isTriviallyCopyable()) 4223 return true; 4224 } 4225 } 4226 } 4227 4228 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4229 BE = RD->vbases_end(); 4230 BI != BE; ++BI) { 4231 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4232 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4233 4234 // Unless we have an assignment operator, the base's destructor must 4235 // be accessible and not deleted. 4236 if (!IsAssignment) { 4237 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4238 if (BaseDtor->isDeleted()) 4239 return true; 4240 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4241 AR_accessible) 4242 return true; 4243 } 4244 4245 // Finding the corresponding member in the base should lead to a 4246 // unique, accessible, non-deleted function. 4247 if (CSM != CXXDestructor) { 4248 SpecialMemberOverloadResult *SMOR = 4249 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4250 false); 4251 if (!SMOR->hasSuccess()) 4252 return true; 4253 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4254 if (IsConstructor) { 4255 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4256 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4257 PDiag()) != AR_accessible) 4258 return true; 4259 4260 // For a move operation, the corresponding operation must actually 4261 // be a move operation (and not a copy selected by overload 4262 // resolution) unless we are working on a trivially copyable class. 4263 if (IsMove && !BaseCtor->isMoveConstructor() && 4264 !BaseDecl->isTriviallyCopyable()) 4265 return true; 4266 } 4267 } 4268 } 4269 4270 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4271 FE = RD->field_end(); 4272 FI != FE; ++FI) { 4273 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4274 continue; 4275 4276 QualType FieldType = Context.getBaseElementType(FI->getType()); 4277 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4278 4279 // For a default constructor, all references must be initialized in-class 4280 // and, if a union, it must have a non-const member. 4281 if (CSM == CXXDefaultConstructor) { 4282 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4283 return true; 4284 4285 if (IsUnion && !FieldType.isConstQualified()) 4286 AllConst = false; 4287 // For a copy constructor, data members must not be of rvalue reference 4288 // type. 4289 } else if (CSM == CXXCopyConstructor) { 4290 if (FieldType->isRValueReferenceType()) 4291 return true; 4292 } 4293 4294 if (FieldRecord) { 4295 // For a default constructor, a const member must have a user-provided 4296 // default constructor or else be explicitly initialized. 4297 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4298 !FI->hasInClassInitializer() && 4299 !FieldRecord->hasUserProvidedDefaultConstructor()) 4300 return true; 4301 4302 // Some additional restrictions exist on the variant members. 4303 if (!IsUnion && FieldRecord->isUnion() && 4304 FieldRecord->isAnonymousStructOrUnion()) { 4305 // We're okay to reuse AllConst here since we only care about the 4306 // value otherwise if we're in a union. 4307 AllConst = true; 4308 4309 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4310 UE = FieldRecord->field_end(); 4311 UI != UE; ++UI) { 4312 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4313 CXXRecordDecl *UnionFieldRecord = 4314 UnionFieldType->getAsCXXRecordDecl(); 4315 4316 if (!UnionFieldType.isConstQualified()) 4317 AllConst = false; 4318 4319 if (UnionFieldRecord) { 4320 // FIXME: Checking for accessibility and validity of this 4321 // destructor is technically going beyond the 4322 // standard, but this is believed to be a defect. 4323 if (!IsAssignment) { 4324 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4325 if (FieldDtor->isDeleted()) 4326 return true; 4327 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4328 AR_accessible) 4329 return true; 4330 if (!FieldDtor->isTrivial()) 4331 return true; 4332 } 4333 4334 if (CSM != CXXDestructor) { 4335 SpecialMemberOverloadResult *SMOR = 4336 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4337 false, false, false); 4338 // FIXME: Checking for accessibility and validity of this 4339 // corresponding member is technically going beyond the 4340 // standard, but this is believed to be a defect. 4341 if (!SMOR->hasSuccess()) 4342 return true; 4343 4344 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4345 // A member of a union must have a trivial corresponding 4346 // constructor. 4347 if (!FieldMember->isTrivial()) 4348 return true; 4349 4350 if (IsConstructor) { 4351 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4352 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4353 PDiag()) != AR_accessible) 4354 return true; 4355 } 4356 } 4357 } 4358 } 4359 4360 // At least one member in each anonymous union must be non-const 4361 if (CSM == CXXDefaultConstructor && AllConst) 4362 return true; 4363 4364 // Don't try to initialize the anonymous union 4365 // This is technically non-conformant, but sanity demands it. 4366 continue; 4367 } 4368 4369 // Unless we're doing assignment, the field's destructor must be 4370 // accessible and not deleted. 4371 if (!IsAssignment) { 4372 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4373 if (FieldDtor->isDeleted()) 4374 return true; 4375 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4376 AR_accessible) 4377 return true; 4378 } 4379 4380 // Check that the corresponding member of the field is accessible, 4381 // unique, and non-deleted. We don't do this if it has an explicit 4382 // initialization when default-constructing. 4383 if (CSM != CXXDestructor && 4384 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4385 SpecialMemberOverloadResult *SMOR = 4386 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4387 false); 4388 if (!SMOR->hasSuccess()) 4389 return true; 4390 4391 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4392 if (IsConstructor) { 4393 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4394 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4395 PDiag()) != AR_accessible) 4396 return true; 4397 4398 // For a move operation, the corresponding operation must actually 4399 // be a move operation (and not a copy selected by overload 4400 // resolution) unless we are working on a trivially copyable class. 4401 if (IsMove && !FieldCtor->isMoveConstructor() && 4402 !FieldRecord->isTriviallyCopyable()) 4403 return true; 4404 } 4405 4406 // We need the corresponding member of a union to be trivial so that 4407 // we can safely copy them all simultaneously. 4408 // FIXME: Note that performing the check here (where we rely on the lack 4409 // of an in-class initializer) is technically ill-formed. However, this 4410 // seems most obviously to be a bug in the standard. 4411 if (IsUnion && !FieldMember->isTrivial()) 4412 return true; 4413 } 4414 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4415 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4416 // We can't initialize a const member of non-class type to any value. 4417 return true; 4418 } 4419 } 4420 4421 // We can't have all const members in a union when default-constructing, 4422 // or else they're all nonsensical garbage values that can't be changed. 4423 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4424 return true; 4425 4426 return false; 4427} 4428 4429bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4430 CXXRecordDecl *RD = MD->getParent(); 4431 assert(!RD->isDependentType() && "do deletion after instantiation"); 4432 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4433 return false; 4434 4435 SourceLocation Loc = MD->getLocation(); 4436 4437 // Do access control from the constructor 4438 ContextRAII MethodContext(*this, MD); 4439 4440 bool Union = RD->isUnion(); 4441 4442 unsigned ArgQuals = 4443 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4444 Qualifiers::Const : 0; 4445 4446 // We do this because we should never actually use an anonymous 4447 // union's constructor. 4448 if (Union && RD->isAnonymousStructOrUnion()) 4449 return false; 4450 4451 // FIXME: We should put some diagnostic logic right into this function. 4452 4453 // C++0x [class.copy]/20 4454 // A defaulted [copy] assignment operator for class X is defined as deleted 4455 // if X has: 4456 4457 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4458 BE = RD->bases_end(); 4459 BI != BE; ++BI) { 4460 // We'll handle this one later 4461 if (BI->isVirtual()) 4462 continue; 4463 4464 QualType BaseType = BI->getType(); 4465 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4466 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4467 4468 // -- a [direct base class] B that cannot be [copied] because overload 4469 // resolution, as applied to B's [copy] assignment operator, results in 4470 // an ambiguity or a function that is deleted or inaccessible from the 4471 // assignment operator 4472 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4473 0); 4474 if (!CopyOper || CopyOper->isDeleted()) 4475 return true; 4476 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4477 return true; 4478 } 4479 4480 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4481 BE = RD->vbases_end(); 4482 BI != BE; ++BI) { 4483 QualType BaseType = BI->getType(); 4484 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4485 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4486 4487 // -- a [virtual base class] B that cannot be [copied] because overload 4488 // resolution, as applied to B's [copy] assignment operator, results in 4489 // an ambiguity or a function that is deleted or inaccessible from the 4490 // assignment operator 4491 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4492 0); 4493 if (!CopyOper || CopyOper->isDeleted()) 4494 return true; 4495 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4496 return true; 4497 } 4498 4499 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4500 FE = RD->field_end(); 4501 FI != FE; ++FI) { 4502 if (FI->isUnnamedBitfield()) 4503 continue; 4504 4505 QualType FieldType = Context.getBaseElementType(FI->getType()); 4506 4507 // -- a non-static data member of reference type 4508 if (FieldType->isReferenceType()) 4509 return true; 4510 4511 // -- a non-static data member of const non-class type (or array thereof) 4512 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4513 return true; 4514 4515 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4516 4517 if (FieldRecord) { 4518 // This is an anonymous union 4519 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4520 // Anonymous unions inside unions do not variant members create 4521 if (!Union) { 4522 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4523 UE = FieldRecord->field_end(); 4524 UI != UE; ++UI) { 4525 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4526 CXXRecordDecl *UnionFieldRecord = 4527 UnionFieldType->getAsCXXRecordDecl(); 4528 4529 // -- a variant member with a non-trivial [copy] assignment operator 4530 // and X is a union-like class 4531 if (UnionFieldRecord && 4532 !UnionFieldRecord->hasTrivialCopyAssignment()) 4533 return true; 4534 } 4535 } 4536 4537 // Don't try to initalize an anonymous union 4538 continue; 4539 // -- a variant member with a non-trivial [copy] assignment operator 4540 // and X is a union-like class 4541 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4542 return true; 4543 } 4544 4545 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4546 false, 0); 4547 if (!CopyOper || CopyOper->isDeleted()) 4548 return true; 4549 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4550 return true; 4551 } 4552 } 4553 4554 return false; 4555} 4556 4557bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4558 CXXRecordDecl *RD = MD->getParent(); 4559 assert(!RD->isDependentType() && "do deletion after instantiation"); 4560 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4561 return false; 4562 4563 SourceLocation Loc = MD->getLocation(); 4564 4565 // Do access control from the constructor 4566 ContextRAII MethodContext(*this, MD); 4567 4568 bool Union = RD->isUnion(); 4569 4570 // We do this because we should never actually use an anonymous 4571 // union's constructor. 4572 if (Union && RD->isAnonymousStructOrUnion()) 4573 return false; 4574 4575 // C++0x [class.copy]/20 4576 // A defaulted [move] assignment operator for class X is defined as deleted 4577 // if X has: 4578 4579 // -- for the move constructor, [...] any direct or indirect virtual base 4580 // class. 4581 if (RD->getNumVBases() != 0) 4582 return true; 4583 4584 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4585 BE = RD->bases_end(); 4586 BI != BE; ++BI) { 4587 4588 QualType BaseType = BI->getType(); 4589 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4590 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4591 4592 // -- a [direct base class] B that cannot be [moved] because overload 4593 // resolution, as applied to B's [move] assignment operator, results in 4594 // an ambiguity or a function that is deleted or inaccessible from the 4595 // assignment operator 4596 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4597 if (!MoveOper || MoveOper->isDeleted()) 4598 return true; 4599 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4600 return true; 4601 4602 // -- for the move assignment operator, a [direct base class] with a type 4603 // that does not have a move assignment operator and is not trivially 4604 // copyable. 4605 if (!MoveOper->isMoveAssignmentOperator() && 4606 !BaseDecl->isTriviallyCopyable()) 4607 return true; 4608 } 4609 4610 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4611 FE = RD->field_end(); 4612 FI != FE; ++FI) { 4613 if (FI->isUnnamedBitfield()) 4614 continue; 4615 4616 QualType FieldType = Context.getBaseElementType(FI->getType()); 4617 4618 // -- a non-static data member of reference type 4619 if (FieldType->isReferenceType()) 4620 return true; 4621 4622 // -- a non-static data member of const non-class type (or array thereof) 4623 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4624 return true; 4625 4626 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4627 4628 if (FieldRecord) { 4629 // This is an anonymous union 4630 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4631 // Anonymous unions inside unions do not variant members create 4632 if (!Union) { 4633 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4634 UE = FieldRecord->field_end(); 4635 UI != UE; ++UI) { 4636 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4637 CXXRecordDecl *UnionFieldRecord = 4638 UnionFieldType->getAsCXXRecordDecl(); 4639 4640 // -- a variant member with a non-trivial [move] assignment operator 4641 // and X is a union-like class 4642 if (UnionFieldRecord && 4643 !UnionFieldRecord->hasTrivialMoveAssignment()) 4644 return true; 4645 } 4646 } 4647 4648 // Don't try to initalize an anonymous union 4649 continue; 4650 // -- a variant member with a non-trivial [move] assignment operator 4651 // and X is a union-like class 4652 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4653 return true; 4654 } 4655 4656 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4657 if (!MoveOper || MoveOper->isDeleted()) 4658 return true; 4659 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4660 return true; 4661 4662 // -- for the move assignment operator, a [non-static data member] with a 4663 // type that does not have a move assignment operator and is not 4664 // trivially copyable. 4665 if (!MoveOper->isMoveAssignmentOperator() && 4666 !FieldRecord->isTriviallyCopyable()) 4667 return true; 4668 } 4669 } 4670 4671 return false; 4672} 4673 4674bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4675 CXXRecordDecl *RD = DD->getParent(); 4676 assert(!RD->isDependentType() && "do deletion after instantiation"); 4677 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4678 return false; 4679 4680 SourceLocation Loc = DD->getLocation(); 4681 4682 // Do access control from the destructor 4683 ContextRAII CtorContext(*this, DD); 4684 4685 bool Union = RD->isUnion(); 4686 4687 // We do this because we should never actually use an anonymous 4688 // union's destructor. 4689 if (Union && RD->isAnonymousStructOrUnion()) 4690 return false; 4691 4692 // C++0x [class.dtor]p5 4693 // A defaulted destructor for a class X is defined as deleted if: 4694 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4695 BE = RD->bases_end(); 4696 BI != BE; ++BI) { 4697 // We'll handle this one later 4698 if (BI->isVirtual()) 4699 continue; 4700 4701 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4702 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4703 assert(BaseDtor && "base has no destructor"); 4704 4705 // -- any direct or virtual base class has a deleted destructor or 4706 // a destructor that is inaccessible from the defaulted destructor 4707 if (BaseDtor->isDeleted()) 4708 return true; 4709 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4710 AR_accessible) 4711 return true; 4712 } 4713 4714 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4715 BE = RD->vbases_end(); 4716 BI != BE; ++BI) { 4717 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4718 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4719 assert(BaseDtor && "base has no destructor"); 4720 4721 // -- any direct or virtual base class has a deleted destructor or 4722 // a destructor that is inaccessible from the defaulted destructor 4723 if (BaseDtor->isDeleted()) 4724 return true; 4725 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4726 AR_accessible) 4727 return true; 4728 } 4729 4730 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4731 FE = RD->field_end(); 4732 FI != FE; ++FI) { 4733 QualType FieldType = Context.getBaseElementType(FI->getType()); 4734 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4735 if (FieldRecord) { 4736 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4737 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4738 UE = FieldRecord->field_end(); 4739 UI != UE; ++UI) { 4740 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4741 CXXRecordDecl *UnionFieldRecord = 4742 UnionFieldType->getAsCXXRecordDecl(); 4743 4744 // -- X is a union-like class that has a variant member with a non- 4745 // trivial destructor. 4746 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4747 return true; 4748 } 4749 // Technically we are supposed to do this next check unconditionally. 4750 // But that makes absolutely no sense. 4751 } else { 4752 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4753 4754 // -- any of the non-static data members has class type M (or array 4755 // thereof) and M has a deleted destructor or a destructor that is 4756 // inaccessible from the defaulted destructor 4757 if (FieldDtor->isDeleted()) 4758 return true; 4759 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4760 AR_accessible) 4761 return true; 4762 4763 // -- X is a union-like class that has a variant member with a non- 4764 // trivial destructor. 4765 if (Union && !FieldDtor->isTrivial()) 4766 return true; 4767 } 4768 } 4769 } 4770 4771 if (DD->isVirtual()) { 4772 FunctionDecl *OperatorDelete = 0; 4773 DeclarationName Name = 4774 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4775 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4776 false)) 4777 return true; 4778 } 4779 4780 4781 return false; 4782} 4783 4784/// \brief Data used with FindHiddenVirtualMethod 4785namespace { 4786 struct FindHiddenVirtualMethodData { 4787 Sema *S; 4788 CXXMethodDecl *Method; 4789 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4790 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4791 }; 4792} 4793 4794/// \brief Member lookup function that determines whether a given C++ 4795/// method overloads virtual methods in a base class without overriding any, 4796/// to be used with CXXRecordDecl::lookupInBases(). 4797static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4798 CXXBasePath &Path, 4799 void *UserData) { 4800 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4801 4802 FindHiddenVirtualMethodData &Data 4803 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4804 4805 DeclarationName Name = Data.Method->getDeclName(); 4806 assert(Name.getNameKind() == DeclarationName::Identifier); 4807 4808 bool foundSameNameMethod = false; 4809 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4810 for (Path.Decls = BaseRecord->lookup(Name); 4811 Path.Decls.first != Path.Decls.second; 4812 ++Path.Decls.first) { 4813 NamedDecl *D = *Path.Decls.first; 4814 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4815 MD = MD->getCanonicalDecl(); 4816 foundSameNameMethod = true; 4817 // Interested only in hidden virtual methods. 4818 if (!MD->isVirtual()) 4819 continue; 4820 // If the method we are checking overrides a method from its base 4821 // don't warn about the other overloaded methods. 4822 if (!Data.S->IsOverload(Data.Method, MD, false)) 4823 return true; 4824 // Collect the overload only if its hidden. 4825 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4826 overloadedMethods.push_back(MD); 4827 } 4828 } 4829 4830 if (foundSameNameMethod) 4831 Data.OverloadedMethods.append(overloadedMethods.begin(), 4832 overloadedMethods.end()); 4833 return foundSameNameMethod; 4834} 4835 4836/// \brief See if a method overloads virtual methods in a base class without 4837/// overriding any. 4838void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4839 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4840 MD->getLocation()) == DiagnosticsEngine::Ignored) 4841 return; 4842 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4843 return; 4844 4845 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4846 /*bool RecordPaths=*/false, 4847 /*bool DetectVirtual=*/false); 4848 FindHiddenVirtualMethodData Data; 4849 Data.Method = MD; 4850 Data.S = this; 4851 4852 // Keep the base methods that were overriden or introduced in the subclass 4853 // by 'using' in a set. A base method not in this set is hidden. 4854 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4855 res.first != res.second; ++res.first) { 4856 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4857 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4858 E = MD->end_overridden_methods(); 4859 I != E; ++I) 4860 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4861 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4862 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4863 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4864 } 4865 4866 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4867 !Data.OverloadedMethods.empty()) { 4868 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4869 << MD << (Data.OverloadedMethods.size() > 1); 4870 4871 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4872 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4873 Diag(overloadedMD->getLocation(), 4874 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4875 } 4876 } 4877} 4878 4879void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4880 Decl *TagDecl, 4881 SourceLocation LBrac, 4882 SourceLocation RBrac, 4883 AttributeList *AttrList) { 4884 if (!TagDecl) 4885 return; 4886 4887 AdjustDeclIfTemplate(TagDecl); 4888 4889 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4890 // strict aliasing violation! 4891 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4892 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4893 4894 CheckCompletedCXXClass( 4895 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4896} 4897 4898/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4899/// special functions, such as the default constructor, copy 4900/// constructor, or destructor, to the given C++ class (C++ 4901/// [special]p1). This routine can only be executed just before the 4902/// definition of the class is complete. 4903void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4904 if (!ClassDecl->hasUserDeclaredConstructor()) 4905 ++ASTContext::NumImplicitDefaultConstructors; 4906 4907 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4908 ++ASTContext::NumImplicitCopyConstructors; 4909 4910 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4911 ++ASTContext::NumImplicitCopyAssignmentOperators; 4912 4913 // If we have a dynamic class, then the copy assignment operator may be 4914 // virtual, so we have to declare it immediately. This ensures that, e.g., 4915 // it shows up in the right place in the vtable and that we diagnose 4916 // problems with the implicit exception specification. 4917 if (ClassDecl->isDynamicClass()) 4918 DeclareImplicitCopyAssignment(ClassDecl); 4919 } 4920 4921 if (!ClassDecl->hasUserDeclaredDestructor()) { 4922 ++ASTContext::NumImplicitDestructors; 4923 4924 // If we have a dynamic class, then the destructor may be virtual, so we 4925 // have to declare the destructor immediately. This ensures that, e.g., it 4926 // shows up in the right place in the vtable and that we diagnose problems 4927 // with the implicit exception specification. 4928 if (ClassDecl->isDynamicClass()) 4929 DeclareImplicitDestructor(ClassDecl); 4930 } 4931} 4932 4933void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4934 if (!D) 4935 return; 4936 4937 int NumParamList = D->getNumTemplateParameterLists(); 4938 for (int i = 0; i < NumParamList; i++) { 4939 TemplateParameterList* Params = D->getTemplateParameterList(i); 4940 for (TemplateParameterList::iterator Param = Params->begin(), 4941 ParamEnd = Params->end(); 4942 Param != ParamEnd; ++Param) { 4943 NamedDecl *Named = cast<NamedDecl>(*Param); 4944 if (Named->getDeclName()) { 4945 S->AddDecl(Named); 4946 IdResolver.AddDecl(Named); 4947 } 4948 } 4949 } 4950} 4951 4952void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4953 if (!D) 4954 return; 4955 4956 TemplateParameterList *Params = 0; 4957 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4958 Params = Template->getTemplateParameters(); 4959 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4960 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4961 Params = PartialSpec->getTemplateParameters(); 4962 else 4963 return; 4964 4965 for (TemplateParameterList::iterator Param = Params->begin(), 4966 ParamEnd = Params->end(); 4967 Param != ParamEnd; ++Param) { 4968 NamedDecl *Named = cast<NamedDecl>(*Param); 4969 if (Named->getDeclName()) { 4970 S->AddDecl(Named); 4971 IdResolver.AddDecl(Named); 4972 } 4973 } 4974} 4975 4976void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4977 if (!RecordD) return; 4978 AdjustDeclIfTemplate(RecordD); 4979 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4980 PushDeclContext(S, Record); 4981} 4982 4983void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4984 if (!RecordD) return; 4985 PopDeclContext(); 4986} 4987 4988/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4989/// parsing a top-level (non-nested) C++ class, and we are now 4990/// parsing those parts of the given Method declaration that could 4991/// not be parsed earlier (C++ [class.mem]p2), such as default 4992/// arguments. This action should enter the scope of the given 4993/// Method declaration as if we had just parsed the qualified method 4994/// name. However, it should not bring the parameters into scope; 4995/// that will be performed by ActOnDelayedCXXMethodParameter. 4996void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4997} 4998 4999/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5000/// C++ method declaration. We're (re-)introducing the given 5001/// function parameter into scope for use in parsing later parts of 5002/// the method declaration. For example, we could see an 5003/// ActOnParamDefaultArgument event for this parameter. 5004void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5005 if (!ParamD) 5006 return; 5007 5008 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5009 5010 // If this parameter has an unparsed default argument, clear it out 5011 // to make way for the parsed default argument. 5012 if (Param->hasUnparsedDefaultArg()) 5013 Param->setDefaultArg(0); 5014 5015 S->AddDecl(Param); 5016 if (Param->getDeclName()) 5017 IdResolver.AddDecl(Param); 5018} 5019 5020/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5021/// processing the delayed method declaration for Method. The method 5022/// declaration is now considered finished. There may be a separate 5023/// ActOnStartOfFunctionDef action later (not necessarily 5024/// immediately!) for this method, if it was also defined inside the 5025/// class body. 5026void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5027 if (!MethodD) 5028 return; 5029 5030 AdjustDeclIfTemplate(MethodD); 5031 5032 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5033 5034 // Now that we have our default arguments, check the constructor 5035 // again. It could produce additional diagnostics or affect whether 5036 // the class has implicitly-declared destructors, among other 5037 // things. 5038 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5039 CheckConstructor(Constructor); 5040 5041 // Check the default arguments, which we may have added. 5042 if (!Method->isInvalidDecl()) 5043 CheckCXXDefaultArguments(Method); 5044} 5045 5046/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5047/// the well-formedness of the constructor declarator @p D with type @p 5048/// R. If there are any errors in the declarator, this routine will 5049/// emit diagnostics and set the invalid bit to true. In any case, the type 5050/// will be updated to reflect a well-formed type for the constructor and 5051/// returned. 5052QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5053 StorageClass &SC) { 5054 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5055 5056 // C++ [class.ctor]p3: 5057 // A constructor shall not be virtual (10.3) or static (9.4). A 5058 // constructor can be invoked for a const, volatile or const 5059 // volatile object. A constructor shall not be declared const, 5060 // volatile, or const volatile (9.3.2). 5061 if (isVirtual) { 5062 if (!D.isInvalidType()) 5063 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5064 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5065 << SourceRange(D.getIdentifierLoc()); 5066 D.setInvalidType(); 5067 } 5068 if (SC == SC_Static) { 5069 if (!D.isInvalidType()) 5070 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5071 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5072 << SourceRange(D.getIdentifierLoc()); 5073 D.setInvalidType(); 5074 SC = SC_None; 5075 } 5076 5077 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5078 if (FTI.TypeQuals != 0) { 5079 if (FTI.TypeQuals & Qualifiers::Const) 5080 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5081 << "const" << SourceRange(D.getIdentifierLoc()); 5082 if (FTI.TypeQuals & Qualifiers::Volatile) 5083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5084 << "volatile" << SourceRange(D.getIdentifierLoc()); 5085 if (FTI.TypeQuals & Qualifiers::Restrict) 5086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5087 << "restrict" << SourceRange(D.getIdentifierLoc()); 5088 D.setInvalidType(); 5089 } 5090 5091 // C++0x [class.ctor]p4: 5092 // A constructor shall not be declared with a ref-qualifier. 5093 if (FTI.hasRefQualifier()) { 5094 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5095 << FTI.RefQualifierIsLValueRef 5096 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5097 D.setInvalidType(); 5098 } 5099 5100 // Rebuild the function type "R" without any type qualifiers (in 5101 // case any of the errors above fired) and with "void" as the 5102 // return type, since constructors don't have return types. 5103 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5104 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5105 return R; 5106 5107 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5108 EPI.TypeQuals = 0; 5109 EPI.RefQualifier = RQ_None; 5110 5111 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5112 Proto->getNumArgs(), EPI); 5113} 5114 5115/// CheckConstructor - Checks a fully-formed constructor for 5116/// well-formedness, issuing any diagnostics required. Returns true if 5117/// the constructor declarator is invalid. 5118void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5119 CXXRecordDecl *ClassDecl 5120 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5121 if (!ClassDecl) 5122 return Constructor->setInvalidDecl(); 5123 5124 // C++ [class.copy]p3: 5125 // A declaration of a constructor for a class X is ill-formed if 5126 // its first parameter is of type (optionally cv-qualified) X and 5127 // either there are no other parameters or else all other 5128 // parameters have default arguments. 5129 if (!Constructor->isInvalidDecl() && 5130 ((Constructor->getNumParams() == 1) || 5131 (Constructor->getNumParams() > 1 && 5132 Constructor->getParamDecl(1)->hasDefaultArg())) && 5133 Constructor->getTemplateSpecializationKind() 5134 != TSK_ImplicitInstantiation) { 5135 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5136 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5137 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5138 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5139 const char *ConstRef 5140 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5141 : " const &"; 5142 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5143 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5144 5145 // FIXME: Rather that making the constructor invalid, we should endeavor 5146 // to fix the type. 5147 Constructor->setInvalidDecl(); 5148 } 5149 } 5150} 5151 5152/// CheckDestructor - Checks a fully-formed destructor definition for 5153/// well-formedness, issuing any diagnostics required. Returns true 5154/// on error. 5155bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5156 CXXRecordDecl *RD = Destructor->getParent(); 5157 5158 if (Destructor->isVirtual()) { 5159 SourceLocation Loc; 5160 5161 if (!Destructor->isImplicit()) 5162 Loc = Destructor->getLocation(); 5163 else 5164 Loc = RD->getLocation(); 5165 5166 // If we have a virtual destructor, look up the deallocation function 5167 FunctionDecl *OperatorDelete = 0; 5168 DeclarationName Name = 5169 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5170 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5171 return true; 5172 5173 MarkDeclarationReferenced(Loc, OperatorDelete); 5174 5175 Destructor->setOperatorDelete(OperatorDelete); 5176 } 5177 5178 return false; 5179} 5180 5181static inline bool 5182FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5183 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5184 FTI.ArgInfo[0].Param && 5185 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5186} 5187 5188/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5189/// the well-formednes of the destructor declarator @p D with type @p 5190/// R. If there are any errors in the declarator, this routine will 5191/// emit diagnostics and set the declarator to invalid. Even if this happens, 5192/// will be updated to reflect a well-formed type for the destructor and 5193/// returned. 5194QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5195 StorageClass& SC) { 5196 // C++ [class.dtor]p1: 5197 // [...] A typedef-name that names a class is a class-name 5198 // (7.1.3); however, a typedef-name that names a class shall not 5199 // be used as the identifier in the declarator for a destructor 5200 // declaration. 5201 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5202 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5203 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5204 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5205 else if (const TemplateSpecializationType *TST = 5206 DeclaratorType->getAs<TemplateSpecializationType>()) 5207 if (TST->isTypeAlias()) 5208 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5209 << DeclaratorType << 1; 5210 5211 // C++ [class.dtor]p2: 5212 // A destructor is used to destroy objects of its class type. A 5213 // destructor takes no parameters, and no return type can be 5214 // specified for it (not even void). The address of a destructor 5215 // shall not be taken. A destructor shall not be static. A 5216 // destructor can be invoked for a const, volatile or const 5217 // volatile object. A destructor shall not be declared const, 5218 // volatile or const volatile (9.3.2). 5219 if (SC == SC_Static) { 5220 if (!D.isInvalidType()) 5221 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5222 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5223 << SourceRange(D.getIdentifierLoc()) 5224 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5225 5226 SC = SC_None; 5227 } 5228 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5229 // Destructors don't have return types, but the parser will 5230 // happily parse something like: 5231 // 5232 // class X { 5233 // float ~X(); 5234 // }; 5235 // 5236 // The return type will be eliminated later. 5237 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5238 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5239 << SourceRange(D.getIdentifierLoc()); 5240 } 5241 5242 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5243 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5244 if (FTI.TypeQuals & Qualifiers::Const) 5245 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5246 << "const" << SourceRange(D.getIdentifierLoc()); 5247 if (FTI.TypeQuals & Qualifiers::Volatile) 5248 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5249 << "volatile" << SourceRange(D.getIdentifierLoc()); 5250 if (FTI.TypeQuals & Qualifiers::Restrict) 5251 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5252 << "restrict" << SourceRange(D.getIdentifierLoc()); 5253 D.setInvalidType(); 5254 } 5255 5256 // C++0x [class.dtor]p2: 5257 // A destructor shall not be declared with a ref-qualifier. 5258 if (FTI.hasRefQualifier()) { 5259 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5260 << FTI.RefQualifierIsLValueRef 5261 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5262 D.setInvalidType(); 5263 } 5264 5265 // Make sure we don't have any parameters. 5266 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5267 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5268 5269 // Delete the parameters. 5270 FTI.freeArgs(); 5271 D.setInvalidType(); 5272 } 5273 5274 // Make sure the destructor isn't variadic. 5275 if (FTI.isVariadic) { 5276 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5277 D.setInvalidType(); 5278 } 5279 5280 // Rebuild the function type "R" without any type qualifiers or 5281 // parameters (in case any of the errors above fired) and with 5282 // "void" as the return type, since destructors don't have return 5283 // types. 5284 if (!D.isInvalidType()) 5285 return R; 5286 5287 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5288 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5289 EPI.Variadic = false; 5290 EPI.TypeQuals = 0; 5291 EPI.RefQualifier = RQ_None; 5292 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5293} 5294 5295/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5296/// well-formednes of the conversion function declarator @p D with 5297/// type @p R. If there are any errors in the declarator, this routine 5298/// will emit diagnostics and return true. Otherwise, it will return 5299/// false. Either way, the type @p R will be updated to reflect a 5300/// well-formed type for the conversion operator. 5301void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5302 StorageClass& SC) { 5303 // C++ [class.conv.fct]p1: 5304 // Neither parameter types nor return type can be specified. The 5305 // type of a conversion function (8.3.5) is "function taking no 5306 // parameter returning conversion-type-id." 5307 if (SC == SC_Static) { 5308 if (!D.isInvalidType()) 5309 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5310 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5311 << SourceRange(D.getIdentifierLoc()); 5312 D.setInvalidType(); 5313 SC = SC_None; 5314 } 5315 5316 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5317 5318 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5319 // Conversion functions don't have return types, but the parser will 5320 // happily parse something like: 5321 // 5322 // class X { 5323 // float operator bool(); 5324 // }; 5325 // 5326 // The return type will be changed later anyway. 5327 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5328 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5329 << SourceRange(D.getIdentifierLoc()); 5330 D.setInvalidType(); 5331 } 5332 5333 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5334 5335 // Make sure we don't have any parameters. 5336 if (Proto->getNumArgs() > 0) { 5337 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5338 5339 // Delete the parameters. 5340 D.getFunctionTypeInfo().freeArgs(); 5341 D.setInvalidType(); 5342 } else if (Proto->isVariadic()) { 5343 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5344 D.setInvalidType(); 5345 } 5346 5347 // Diagnose "&operator bool()" and other such nonsense. This 5348 // is actually a gcc extension which we don't support. 5349 if (Proto->getResultType() != ConvType) { 5350 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5351 << Proto->getResultType(); 5352 D.setInvalidType(); 5353 ConvType = Proto->getResultType(); 5354 } 5355 5356 // C++ [class.conv.fct]p4: 5357 // The conversion-type-id shall not represent a function type nor 5358 // an array type. 5359 if (ConvType->isArrayType()) { 5360 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5361 ConvType = Context.getPointerType(ConvType); 5362 D.setInvalidType(); 5363 } else if (ConvType->isFunctionType()) { 5364 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5365 ConvType = Context.getPointerType(ConvType); 5366 D.setInvalidType(); 5367 } 5368 5369 // Rebuild the function type "R" without any parameters (in case any 5370 // of the errors above fired) and with the conversion type as the 5371 // return type. 5372 if (D.isInvalidType()) 5373 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5374 5375 // C++0x explicit conversion operators. 5376 if (D.getDeclSpec().isExplicitSpecified()) 5377 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5378 getLangOptions().CPlusPlus0x ? 5379 diag::warn_cxx98_compat_explicit_conversion_functions : 5380 diag::ext_explicit_conversion_functions) 5381 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5382} 5383 5384/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5385/// the declaration of the given C++ conversion function. This routine 5386/// is responsible for recording the conversion function in the C++ 5387/// class, if possible. 5388Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5389 assert(Conversion && "Expected to receive a conversion function declaration"); 5390 5391 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5392 5393 // Make sure we aren't redeclaring the conversion function. 5394 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5395 5396 // C++ [class.conv.fct]p1: 5397 // [...] A conversion function is never used to convert a 5398 // (possibly cv-qualified) object to the (possibly cv-qualified) 5399 // same object type (or a reference to it), to a (possibly 5400 // cv-qualified) base class of that type (or a reference to it), 5401 // or to (possibly cv-qualified) void. 5402 // FIXME: Suppress this warning if the conversion function ends up being a 5403 // virtual function that overrides a virtual function in a base class. 5404 QualType ClassType 5405 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5406 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5407 ConvType = ConvTypeRef->getPointeeType(); 5408 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5409 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5410 /* Suppress diagnostics for instantiations. */; 5411 else if (ConvType->isRecordType()) { 5412 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5413 if (ConvType == ClassType) 5414 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5415 << ClassType; 5416 else if (IsDerivedFrom(ClassType, ConvType)) 5417 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5418 << ClassType << ConvType; 5419 } else if (ConvType->isVoidType()) { 5420 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5421 << ClassType << ConvType; 5422 } 5423 5424 if (FunctionTemplateDecl *ConversionTemplate 5425 = Conversion->getDescribedFunctionTemplate()) 5426 return ConversionTemplate; 5427 5428 return Conversion; 5429} 5430 5431//===----------------------------------------------------------------------===// 5432// Namespace Handling 5433//===----------------------------------------------------------------------===// 5434 5435 5436 5437/// ActOnStartNamespaceDef - This is called at the start of a namespace 5438/// definition. 5439Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5440 SourceLocation InlineLoc, 5441 SourceLocation NamespaceLoc, 5442 SourceLocation IdentLoc, 5443 IdentifierInfo *II, 5444 SourceLocation LBrace, 5445 AttributeList *AttrList) { 5446 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5447 // For anonymous namespace, take the location of the left brace. 5448 SourceLocation Loc = II ? IdentLoc : LBrace; 5449 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5450 StartLoc, Loc, II); 5451 Namespc->setInline(InlineLoc.isValid()); 5452 5453 Scope *DeclRegionScope = NamespcScope->getParent(); 5454 5455 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5456 5457 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5458 PushNamespaceVisibilityAttr(Attr); 5459 5460 if (II) { 5461 // C++ [namespace.def]p2: 5462 // The identifier in an original-namespace-definition shall not 5463 // have been previously defined in the declarative region in 5464 // which the original-namespace-definition appears. The 5465 // identifier in an original-namespace-definition is the name of 5466 // the namespace. Subsequently in that declarative region, it is 5467 // treated as an original-namespace-name. 5468 // 5469 // Since namespace names are unique in their scope, and we don't 5470 // look through using directives, just look for any ordinary names. 5471 5472 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5473 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5474 Decl::IDNS_Namespace; 5475 NamedDecl *PrevDecl = 0; 5476 for (DeclContext::lookup_result R 5477 = CurContext->getRedeclContext()->lookup(II); 5478 R.first != R.second; ++R.first) { 5479 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5480 PrevDecl = *R.first; 5481 break; 5482 } 5483 } 5484 5485 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5486 // This is an extended namespace definition. 5487 if (Namespc->isInline() != OrigNS->isInline()) { 5488 // inline-ness must match 5489 if (OrigNS->isInline()) { 5490 // The user probably just forgot the 'inline', so suggest that it 5491 // be added back. 5492 Diag(Namespc->getLocation(), 5493 diag::warn_inline_namespace_reopened_noninline) 5494 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5495 } else { 5496 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5497 << Namespc->isInline(); 5498 } 5499 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5500 5501 // Recover by ignoring the new namespace's inline status. 5502 Namespc->setInline(OrigNS->isInline()); 5503 } 5504 5505 // Attach this namespace decl to the chain of extended namespace 5506 // definitions. 5507 OrigNS->setNextNamespace(Namespc); 5508 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5509 5510 // Remove the previous declaration from the scope. 5511 if (DeclRegionScope->isDeclScope(OrigNS)) { 5512 IdResolver.RemoveDecl(OrigNS); 5513 DeclRegionScope->RemoveDecl(OrigNS); 5514 } 5515 } else if (PrevDecl) { 5516 // This is an invalid name redefinition. 5517 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5518 << Namespc->getDeclName(); 5519 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5520 Namespc->setInvalidDecl(); 5521 // Continue on to push Namespc as current DeclContext and return it. 5522 } else if (II->isStr("std") && 5523 CurContext->getRedeclContext()->isTranslationUnit()) { 5524 // This is the first "real" definition of the namespace "std", so update 5525 // our cache of the "std" namespace to point at this definition. 5526 if (NamespaceDecl *StdNS = getStdNamespace()) { 5527 // We had already defined a dummy namespace "std". Link this new 5528 // namespace definition to the dummy namespace "std". 5529 StdNS->setNextNamespace(Namespc); 5530 StdNS->setLocation(IdentLoc); 5531 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5532 } 5533 5534 // Make our StdNamespace cache point at the first real definition of the 5535 // "std" namespace. 5536 StdNamespace = Namespc; 5537 5538 // Add this instance of "std" to the set of known namespaces 5539 KnownNamespaces[Namespc] = false; 5540 } else if (!Namespc->isInline()) { 5541 // Since this is an "original" namespace, add it to the known set of 5542 // namespaces if it is not an inline namespace. 5543 KnownNamespaces[Namespc] = false; 5544 } 5545 5546 PushOnScopeChains(Namespc, DeclRegionScope); 5547 } else { 5548 // Anonymous namespaces. 5549 assert(Namespc->isAnonymousNamespace()); 5550 5551 // Link the anonymous namespace into its parent. 5552 NamespaceDecl *PrevDecl; 5553 DeclContext *Parent = CurContext->getRedeclContext(); 5554 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5555 PrevDecl = TU->getAnonymousNamespace(); 5556 TU->setAnonymousNamespace(Namespc); 5557 } else { 5558 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5559 PrevDecl = ND->getAnonymousNamespace(); 5560 ND->setAnonymousNamespace(Namespc); 5561 } 5562 5563 // Link the anonymous namespace with its previous declaration. 5564 if (PrevDecl) { 5565 assert(PrevDecl->isAnonymousNamespace()); 5566 assert(!PrevDecl->getNextNamespace()); 5567 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5568 PrevDecl->setNextNamespace(Namespc); 5569 5570 if (Namespc->isInline() != PrevDecl->isInline()) { 5571 // inline-ness must match 5572 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5573 << Namespc->isInline(); 5574 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5575 Namespc->setInvalidDecl(); 5576 // Recover by ignoring the new namespace's inline status. 5577 Namespc->setInline(PrevDecl->isInline()); 5578 } 5579 } 5580 5581 CurContext->addDecl(Namespc); 5582 5583 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5584 // behaves as if it were replaced by 5585 // namespace unique { /* empty body */ } 5586 // using namespace unique; 5587 // namespace unique { namespace-body } 5588 // where all occurrences of 'unique' in a translation unit are 5589 // replaced by the same identifier and this identifier differs 5590 // from all other identifiers in the entire program. 5591 5592 // We just create the namespace with an empty name and then add an 5593 // implicit using declaration, just like the standard suggests. 5594 // 5595 // CodeGen enforces the "universally unique" aspect by giving all 5596 // declarations semantically contained within an anonymous 5597 // namespace internal linkage. 5598 5599 if (!PrevDecl) { 5600 UsingDirectiveDecl* UD 5601 = UsingDirectiveDecl::Create(Context, CurContext, 5602 /* 'using' */ LBrace, 5603 /* 'namespace' */ SourceLocation(), 5604 /* qualifier */ NestedNameSpecifierLoc(), 5605 /* identifier */ SourceLocation(), 5606 Namespc, 5607 /* Ancestor */ CurContext); 5608 UD->setImplicit(); 5609 CurContext->addDecl(UD); 5610 } 5611 } 5612 5613 // Although we could have an invalid decl (i.e. the namespace name is a 5614 // redefinition), push it as current DeclContext and try to continue parsing. 5615 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5616 // for the namespace has the declarations that showed up in that particular 5617 // namespace definition. 5618 PushDeclContext(NamespcScope, Namespc); 5619 return Namespc; 5620} 5621 5622/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5623/// is a namespace alias, returns the namespace it points to. 5624static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5625 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5626 return AD->getNamespace(); 5627 return dyn_cast_or_null<NamespaceDecl>(D); 5628} 5629 5630/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5631/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5632void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5633 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5634 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5635 Namespc->setRBraceLoc(RBrace); 5636 PopDeclContext(); 5637 if (Namespc->hasAttr<VisibilityAttr>()) 5638 PopPragmaVisibility(); 5639} 5640 5641CXXRecordDecl *Sema::getStdBadAlloc() const { 5642 return cast_or_null<CXXRecordDecl>( 5643 StdBadAlloc.get(Context.getExternalSource())); 5644} 5645 5646NamespaceDecl *Sema::getStdNamespace() const { 5647 return cast_or_null<NamespaceDecl>( 5648 StdNamespace.get(Context.getExternalSource())); 5649} 5650 5651/// \brief Retrieve the special "std" namespace, which may require us to 5652/// implicitly define the namespace. 5653NamespaceDecl *Sema::getOrCreateStdNamespace() { 5654 if (!StdNamespace) { 5655 // The "std" namespace has not yet been defined, so build one implicitly. 5656 StdNamespace = NamespaceDecl::Create(Context, 5657 Context.getTranslationUnitDecl(), 5658 SourceLocation(), SourceLocation(), 5659 &PP.getIdentifierTable().get("std")); 5660 getStdNamespace()->setImplicit(true); 5661 } 5662 5663 return getStdNamespace(); 5664} 5665 5666/// \brief Determine whether a using statement is in a context where it will be 5667/// apply in all contexts. 5668static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5669 switch (CurContext->getDeclKind()) { 5670 case Decl::TranslationUnit: 5671 return true; 5672 case Decl::LinkageSpec: 5673 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5674 default: 5675 return false; 5676 } 5677} 5678 5679static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5680 CXXScopeSpec &SS, 5681 SourceLocation IdentLoc, 5682 IdentifierInfo *Ident) { 5683 R.clear(); 5684 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5685 R.getLookupKind(), Sc, &SS, NULL, 5686 false, S.CTC_NoKeywords, NULL)) { 5687 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5688 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5689 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5690 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5691 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5692 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5693 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5694 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5695 else 5696 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5697 << Ident << CorrectedQuotedStr 5698 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5699 5700 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5701 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5702 5703 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5704 R.addDecl(Corrected.getCorrectionDecl()); 5705 return true; 5706 } 5707 R.setLookupName(Ident); 5708 } 5709 return false; 5710} 5711 5712Decl *Sema::ActOnUsingDirective(Scope *S, 5713 SourceLocation UsingLoc, 5714 SourceLocation NamespcLoc, 5715 CXXScopeSpec &SS, 5716 SourceLocation IdentLoc, 5717 IdentifierInfo *NamespcName, 5718 AttributeList *AttrList) { 5719 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5720 assert(NamespcName && "Invalid NamespcName."); 5721 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5722 5723 // This can only happen along a recovery path. 5724 while (S->getFlags() & Scope::TemplateParamScope) 5725 S = S->getParent(); 5726 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5727 5728 UsingDirectiveDecl *UDir = 0; 5729 NestedNameSpecifier *Qualifier = 0; 5730 if (SS.isSet()) 5731 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5732 5733 // Lookup namespace name. 5734 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5735 LookupParsedName(R, S, &SS); 5736 if (R.isAmbiguous()) 5737 return 0; 5738 5739 if (R.empty()) { 5740 R.clear(); 5741 // Allow "using namespace std;" or "using namespace ::std;" even if 5742 // "std" hasn't been defined yet, for GCC compatibility. 5743 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5744 NamespcName->isStr("std")) { 5745 Diag(IdentLoc, diag::ext_using_undefined_std); 5746 R.addDecl(getOrCreateStdNamespace()); 5747 R.resolveKind(); 5748 } 5749 // Otherwise, attempt typo correction. 5750 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5751 } 5752 5753 if (!R.empty()) { 5754 NamedDecl *Named = R.getFoundDecl(); 5755 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5756 && "expected namespace decl"); 5757 // C++ [namespace.udir]p1: 5758 // A using-directive specifies that the names in the nominated 5759 // namespace can be used in the scope in which the 5760 // using-directive appears after the using-directive. During 5761 // unqualified name lookup (3.4.1), the names appear as if they 5762 // were declared in the nearest enclosing namespace which 5763 // contains both the using-directive and the nominated 5764 // namespace. [Note: in this context, "contains" means "contains 5765 // directly or indirectly". ] 5766 5767 // Find enclosing context containing both using-directive and 5768 // nominated namespace. 5769 NamespaceDecl *NS = getNamespaceDecl(Named); 5770 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5771 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5772 CommonAncestor = CommonAncestor->getParent(); 5773 5774 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5775 SS.getWithLocInContext(Context), 5776 IdentLoc, Named, CommonAncestor); 5777 5778 if (IsUsingDirectiveInToplevelContext(CurContext) && 5779 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5780 Diag(IdentLoc, diag::warn_using_directive_in_header); 5781 } 5782 5783 PushUsingDirective(S, UDir); 5784 } else { 5785 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5786 } 5787 5788 // FIXME: We ignore attributes for now. 5789 return UDir; 5790} 5791 5792void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5793 // If scope has associated entity, then using directive is at namespace 5794 // or translation unit scope. We add UsingDirectiveDecls, into 5795 // it's lookup structure. 5796 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5797 Ctx->addDecl(UDir); 5798 else 5799 // Otherwise it is block-sope. using-directives will affect lookup 5800 // only to the end of scope. 5801 S->PushUsingDirective(UDir); 5802} 5803 5804 5805Decl *Sema::ActOnUsingDeclaration(Scope *S, 5806 AccessSpecifier AS, 5807 bool HasUsingKeyword, 5808 SourceLocation UsingLoc, 5809 CXXScopeSpec &SS, 5810 UnqualifiedId &Name, 5811 AttributeList *AttrList, 5812 bool IsTypeName, 5813 SourceLocation TypenameLoc) { 5814 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5815 5816 switch (Name.getKind()) { 5817 case UnqualifiedId::IK_ImplicitSelfParam: 5818 case UnqualifiedId::IK_Identifier: 5819 case UnqualifiedId::IK_OperatorFunctionId: 5820 case UnqualifiedId::IK_LiteralOperatorId: 5821 case UnqualifiedId::IK_ConversionFunctionId: 5822 break; 5823 5824 case UnqualifiedId::IK_ConstructorName: 5825 case UnqualifiedId::IK_ConstructorTemplateId: 5826 // C++0x inherited constructors. 5827 Diag(Name.getSourceRange().getBegin(), 5828 getLangOptions().CPlusPlus0x ? 5829 diag::warn_cxx98_compat_using_decl_constructor : 5830 diag::err_using_decl_constructor) 5831 << SS.getRange(); 5832 5833 if (getLangOptions().CPlusPlus0x) break; 5834 5835 return 0; 5836 5837 case UnqualifiedId::IK_DestructorName: 5838 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5839 << SS.getRange(); 5840 return 0; 5841 5842 case UnqualifiedId::IK_TemplateId: 5843 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5844 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5845 return 0; 5846 } 5847 5848 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5849 DeclarationName TargetName = TargetNameInfo.getName(); 5850 if (!TargetName) 5851 return 0; 5852 5853 // Warn about using declarations. 5854 // TODO: store that the declaration was written without 'using' and 5855 // talk about access decls instead of using decls in the 5856 // diagnostics. 5857 if (!HasUsingKeyword) { 5858 UsingLoc = Name.getSourceRange().getBegin(); 5859 5860 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5861 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5862 } 5863 5864 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5865 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5866 return 0; 5867 5868 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5869 TargetNameInfo, AttrList, 5870 /* IsInstantiation */ false, 5871 IsTypeName, TypenameLoc); 5872 if (UD) 5873 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5874 5875 return UD; 5876} 5877 5878/// \brief Determine whether a using declaration considers the given 5879/// declarations as "equivalent", e.g., if they are redeclarations of 5880/// the same entity or are both typedefs of the same type. 5881static bool 5882IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5883 bool &SuppressRedeclaration) { 5884 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5885 SuppressRedeclaration = false; 5886 return true; 5887 } 5888 5889 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5890 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5891 SuppressRedeclaration = true; 5892 return Context.hasSameType(TD1->getUnderlyingType(), 5893 TD2->getUnderlyingType()); 5894 } 5895 5896 return false; 5897} 5898 5899 5900/// Determines whether to create a using shadow decl for a particular 5901/// decl, given the set of decls existing prior to this using lookup. 5902bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5903 const LookupResult &Previous) { 5904 // Diagnose finding a decl which is not from a base class of the 5905 // current class. We do this now because there are cases where this 5906 // function will silently decide not to build a shadow decl, which 5907 // will pre-empt further diagnostics. 5908 // 5909 // We don't need to do this in C++0x because we do the check once on 5910 // the qualifier. 5911 // 5912 // FIXME: diagnose the following if we care enough: 5913 // struct A { int foo; }; 5914 // struct B : A { using A::foo; }; 5915 // template <class T> struct C : A {}; 5916 // template <class T> struct D : C<T> { using B::foo; } // <--- 5917 // This is invalid (during instantiation) in C++03 because B::foo 5918 // resolves to the using decl in B, which is not a base class of D<T>. 5919 // We can't diagnose it immediately because C<T> is an unknown 5920 // specialization. The UsingShadowDecl in D<T> then points directly 5921 // to A::foo, which will look well-formed when we instantiate. 5922 // The right solution is to not collapse the shadow-decl chain. 5923 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5924 DeclContext *OrigDC = Orig->getDeclContext(); 5925 5926 // Handle enums and anonymous structs. 5927 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5928 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5929 while (OrigRec->isAnonymousStructOrUnion()) 5930 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5931 5932 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5933 if (OrigDC == CurContext) { 5934 Diag(Using->getLocation(), 5935 diag::err_using_decl_nested_name_specifier_is_current_class) 5936 << Using->getQualifierLoc().getSourceRange(); 5937 Diag(Orig->getLocation(), diag::note_using_decl_target); 5938 return true; 5939 } 5940 5941 Diag(Using->getQualifierLoc().getBeginLoc(), 5942 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5943 << Using->getQualifier() 5944 << cast<CXXRecordDecl>(CurContext) 5945 << Using->getQualifierLoc().getSourceRange(); 5946 Diag(Orig->getLocation(), diag::note_using_decl_target); 5947 return true; 5948 } 5949 } 5950 5951 if (Previous.empty()) return false; 5952 5953 NamedDecl *Target = Orig; 5954 if (isa<UsingShadowDecl>(Target)) 5955 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5956 5957 // If the target happens to be one of the previous declarations, we 5958 // don't have a conflict. 5959 // 5960 // FIXME: but we might be increasing its access, in which case we 5961 // should redeclare it. 5962 NamedDecl *NonTag = 0, *Tag = 0; 5963 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5964 I != E; ++I) { 5965 NamedDecl *D = (*I)->getUnderlyingDecl(); 5966 bool Result; 5967 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5968 return Result; 5969 5970 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5971 } 5972 5973 if (Target->isFunctionOrFunctionTemplate()) { 5974 FunctionDecl *FD; 5975 if (isa<FunctionTemplateDecl>(Target)) 5976 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5977 else 5978 FD = cast<FunctionDecl>(Target); 5979 5980 NamedDecl *OldDecl = 0; 5981 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5982 case Ovl_Overload: 5983 return false; 5984 5985 case Ovl_NonFunction: 5986 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5987 break; 5988 5989 // We found a decl with the exact signature. 5990 case Ovl_Match: 5991 // If we're in a record, we want to hide the target, so we 5992 // return true (without a diagnostic) to tell the caller not to 5993 // build a shadow decl. 5994 if (CurContext->isRecord()) 5995 return true; 5996 5997 // If we're not in a record, this is an error. 5998 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5999 break; 6000 } 6001 6002 Diag(Target->getLocation(), diag::note_using_decl_target); 6003 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6004 return true; 6005 } 6006 6007 // Target is not a function. 6008 6009 if (isa<TagDecl>(Target)) { 6010 // No conflict between a tag and a non-tag. 6011 if (!Tag) return false; 6012 6013 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6014 Diag(Target->getLocation(), diag::note_using_decl_target); 6015 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6016 return true; 6017 } 6018 6019 // No conflict between a tag and a non-tag. 6020 if (!NonTag) return false; 6021 6022 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6023 Diag(Target->getLocation(), diag::note_using_decl_target); 6024 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6025 return true; 6026} 6027 6028/// Builds a shadow declaration corresponding to a 'using' declaration. 6029UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6030 UsingDecl *UD, 6031 NamedDecl *Orig) { 6032 6033 // If we resolved to another shadow declaration, just coalesce them. 6034 NamedDecl *Target = Orig; 6035 if (isa<UsingShadowDecl>(Target)) { 6036 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6037 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6038 } 6039 6040 UsingShadowDecl *Shadow 6041 = UsingShadowDecl::Create(Context, CurContext, 6042 UD->getLocation(), UD, Target); 6043 UD->addShadowDecl(Shadow); 6044 6045 Shadow->setAccess(UD->getAccess()); 6046 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6047 Shadow->setInvalidDecl(); 6048 6049 if (S) 6050 PushOnScopeChains(Shadow, S); 6051 else 6052 CurContext->addDecl(Shadow); 6053 6054 6055 return Shadow; 6056} 6057 6058/// Hides a using shadow declaration. This is required by the current 6059/// using-decl implementation when a resolvable using declaration in a 6060/// class is followed by a declaration which would hide or override 6061/// one or more of the using decl's targets; for example: 6062/// 6063/// struct Base { void foo(int); }; 6064/// struct Derived : Base { 6065/// using Base::foo; 6066/// void foo(int); 6067/// }; 6068/// 6069/// The governing language is C++03 [namespace.udecl]p12: 6070/// 6071/// When a using-declaration brings names from a base class into a 6072/// derived class scope, member functions in the derived class 6073/// override and/or hide member functions with the same name and 6074/// parameter types in a base class (rather than conflicting). 6075/// 6076/// There are two ways to implement this: 6077/// (1) optimistically create shadow decls when they're not hidden 6078/// by existing declarations, or 6079/// (2) don't create any shadow decls (or at least don't make them 6080/// visible) until we've fully parsed/instantiated the class. 6081/// The problem with (1) is that we might have to retroactively remove 6082/// a shadow decl, which requires several O(n) operations because the 6083/// decl structures are (very reasonably) not designed for removal. 6084/// (2) avoids this but is very fiddly and phase-dependent. 6085void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6086 if (Shadow->getDeclName().getNameKind() == 6087 DeclarationName::CXXConversionFunctionName) 6088 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6089 6090 // Remove it from the DeclContext... 6091 Shadow->getDeclContext()->removeDecl(Shadow); 6092 6093 // ...and the scope, if applicable... 6094 if (S) { 6095 S->RemoveDecl(Shadow); 6096 IdResolver.RemoveDecl(Shadow); 6097 } 6098 6099 // ...and the using decl. 6100 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6101 6102 // TODO: complain somehow if Shadow was used. It shouldn't 6103 // be possible for this to happen, because...? 6104} 6105 6106/// Builds a using declaration. 6107/// 6108/// \param IsInstantiation - Whether this call arises from an 6109/// instantiation of an unresolved using declaration. We treat 6110/// the lookup differently for these declarations. 6111NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6112 SourceLocation UsingLoc, 6113 CXXScopeSpec &SS, 6114 const DeclarationNameInfo &NameInfo, 6115 AttributeList *AttrList, 6116 bool IsInstantiation, 6117 bool IsTypeName, 6118 SourceLocation TypenameLoc) { 6119 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6120 SourceLocation IdentLoc = NameInfo.getLoc(); 6121 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6122 6123 // FIXME: We ignore attributes for now. 6124 6125 if (SS.isEmpty()) { 6126 Diag(IdentLoc, diag::err_using_requires_qualname); 6127 return 0; 6128 } 6129 6130 // Do the redeclaration lookup in the current scope. 6131 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6132 ForRedeclaration); 6133 Previous.setHideTags(false); 6134 if (S) { 6135 LookupName(Previous, S); 6136 6137 // It is really dumb that we have to do this. 6138 LookupResult::Filter F = Previous.makeFilter(); 6139 while (F.hasNext()) { 6140 NamedDecl *D = F.next(); 6141 if (!isDeclInScope(D, CurContext, S)) 6142 F.erase(); 6143 } 6144 F.done(); 6145 } else { 6146 assert(IsInstantiation && "no scope in non-instantiation"); 6147 assert(CurContext->isRecord() && "scope not record in instantiation"); 6148 LookupQualifiedName(Previous, CurContext); 6149 } 6150 6151 // Check for invalid redeclarations. 6152 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6153 return 0; 6154 6155 // Check for bad qualifiers. 6156 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6157 return 0; 6158 6159 DeclContext *LookupContext = computeDeclContext(SS); 6160 NamedDecl *D; 6161 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6162 if (!LookupContext) { 6163 if (IsTypeName) { 6164 // FIXME: not all declaration name kinds are legal here 6165 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6166 UsingLoc, TypenameLoc, 6167 QualifierLoc, 6168 IdentLoc, NameInfo.getName()); 6169 } else { 6170 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6171 QualifierLoc, NameInfo); 6172 } 6173 } else { 6174 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6175 NameInfo, IsTypeName); 6176 } 6177 D->setAccess(AS); 6178 CurContext->addDecl(D); 6179 6180 if (!LookupContext) return D; 6181 UsingDecl *UD = cast<UsingDecl>(D); 6182 6183 if (RequireCompleteDeclContext(SS, LookupContext)) { 6184 UD->setInvalidDecl(); 6185 return UD; 6186 } 6187 6188 // Constructor inheriting using decls get special treatment. 6189 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6190 if (CheckInheritedConstructorUsingDecl(UD)) 6191 UD->setInvalidDecl(); 6192 return UD; 6193 } 6194 6195 // Otherwise, look up the target name. 6196 6197 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6198 6199 // Unlike most lookups, we don't always want to hide tag 6200 // declarations: tag names are visible through the using declaration 6201 // even if hidden by ordinary names, *except* in a dependent context 6202 // where it's important for the sanity of two-phase lookup. 6203 if (!IsInstantiation) 6204 R.setHideTags(false); 6205 6206 LookupQualifiedName(R, LookupContext); 6207 6208 if (R.empty()) { 6209 Diag(IdentLoc, diag::err_no_member) 6210 << NameInfo.getName() << LookupContext << SS.getRange(); 6211 UD->setInvalidDecl(); 6212 return UD; 6213 } 6214 6215 if (R.isAmbiguous()) { 6216 UD->setInvalidDecl(); 6217 return UD; 6218 } 6219 6220 if (IsTypeName) { 6221 // If we asked for a typename and got a non-type decl, error out. 6222 if (!R.getAsSingle<TypeDecl>()) { 6223 Diag(IdentLoc, diag::err_using_typename_non_type); 6224 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6225 Diag((*I)->getUnderlyingDecl()->getLocation(), 6226 diag::note_using_decl_target); 6227 UD->setInvalidDecl(); 6228 return UD; 6229 } 6230 } else { 6231 // If we asked for a non-typename and we got a type, error out, 6232 // but only if this is an instantiation of an unresolved using 6233 // decl. Otherwise just silently find the type name. 6234 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6235 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6236 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6237 UD->setInvalidDecl(); 6238 return UD; 6239 } 6240 } 6241 6242 // C++0x N2914 [namespace.udecl]p6: 6243 // A using-declaration shall not name a namespace. 6244 if (R.getAsSingle<NamespaceDecl>()) { 6245 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6246 << SS.getRange(); 6247 UD->setInvalidDecl(); 6248 return UD; 6249 } 6250 6251 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6252 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6253 BuildUsingShadowDecl(S, UD, *I); 6254 } 6255 6256 return UD; 6257} 6258 6259/// Additional checks for a using declaration referring to a constructor name. 6260bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6261 if (UD->isTypeName()) { 6262 // FIXME: Cannot specify typename when specifying constructor 6263 return true; 6264 } 6265 6266 const Type *SourceType = UD->getQualifier()->getAsType(); 6267 assert(SourceType && 6268 "Using decl naming constructor doesn't have type in scope spec."); 6269 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6270 6271 // Check whether the named type is a direct base class. 6272 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6273 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6274 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6275 BaseIt != BaseE; ++BaseIt) { 6276 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6277 if (CanonicalSourceType == BaseType) 6278 break; 6279 } 6280 6281 if (BaseIt == BaseE) { 6282 // Did not find SourceType in the bases. 6283 Diag(UD->getUsingLocation(), 6284 diag::err_using_decl_constructor_not_in_direct_base) 6285 << UD->getNameInfo().getSourceRange() 6286 << QualType(SourceType, 0) << TargetClass; 6287 return true; 6288 } 6289 6290 BaseIt->setInheritConstructors(); 6291 6292 return false; 6293} 6294 6295/// Checks that the given using declaration is not an invalid 6296/// redeclaration. Note that this is checking only for the using decl 6297/// itself, not for any ill-formedness among the UsingShadowDecls. 6298bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6299 bool isTypeName, 6300 const CXXScopeSpec &SS, 6301 SourceLocation NameLoc, 6302 const LookupResult &Prev) { 6303 // C++03 [namespace.udecl]p8: 6304 // C++0x [namespace.udecl]p10: 6305 // A using-declaration is a declaration and can therefore be used 6306 // repeatedly where (and only where) multiple declarations are 6307 // allowed. 6308 // 6309 // That's in non-member contexts. 6310 if (!CurContext->getRedeclContext()->isRecord()) 6311 return false; 6312 6313 NestedNameSpecifier *Qual 6314 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6315 6316 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6317 NamedDecl *D = *I; 6318 6319 bool DTypename; 6320 NestedNameSpecifier *DQual; 6321 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6322 DTypename = UD->isTypeName(); 6323 DQual = UD->getQualifier(); 6324 } else if (UnresolvedUsingValueDecl *UD 6325 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6326 DTypename = false; 6327 DQual = UD->getQualifier(); 6328 } else if (UnresolvedUsingTypenameDecl *UD 6329 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6330 DTypename = true; 6331 DQual = UD->getQualifier(); 6332 } else continue; 6333 6334 // using decls differ if one says 'typename' and the other doesn't. 6335 // FIXME: non-dependent using decls? 6336 if (isTypeName != DTypename) continue; 6337 6338 // using decls differ if they name different scopes (but note that 6339 // template instantiation can cause this check to trigger when it 6340 // didn't before instantiation). 6341 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6342 Context.getCanonicalNestedNameSpecifier(DQual)) 6343 continue; 6344 6345 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6346 Diag(D->getLocation(), diag::note_using_decl) << 1; 6347 return true; 6348 } 6349 6350 return false; 6351} 6352 6353 6354/// Checks that the given nested-name qualifier used in a using decl 6355/// in the current context is appropriately related to the current 6356/// scope. If an error is found, diagnoses it and returns true. 6357bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6358 const CXXScopeSpec &SS, 6359 SourceLocation NameLoc) { 6360 DeclContext *NamedContext = computeDeclContext(SS); 6361 6362 if (!CurContext->isRecord()) { 6363 // C++03 [namespace.udecl]p3: 6364 // C++0x [namespace.udecl]p8: 6365 // A using-declaration for a class member shall be a member-declaration. 6366 6367 // If we weren't able to compute a valid scope, it must be a 6368 // dependent class scope. 6369 if (!NamedContext || NamedContext->isRecord()) { 6370 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6371 << SS.getRange(); 6372 return true; 6373 } 6374 6375 // Otherwise, everything is known to be fine. 6376 return false; 6377 } 6378 6379 // The current scope is a record. 6380 6381 // If the named context is dependent, we can't decide much. 6382 if (!NamedContext) { 6383 // FIXME: in C++0x, we can diagnose if we can prove that the 6384 // nested-name-specifier does not refer to a base class, which is 6385 // still possible in some cases. 6386 6387 // Otherwise we have to conservatively report that things might be 6388 // okay. 6389 return false; 6390 } 6391 6392 if (!NamedContext->isRecord()) { 6393 // Ideally this would point at the last name in the specifier, 6394 // but we don't have that level of source info. 6395 Diag(SS.getRange().getBegin(), 6396 diag::err_using_decl_nested_name_specifier_is_not_class) 6397 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6398 return true; 6399 } 6400 6401 if (!NamedContext->isDependentContext() && 6402 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6403 return true; 6404 6405 if (getLangOptions().CPlusPlus0x) { 6406 // C++0x [namespace.udecl]p3: 6407 // In a using-declaration used as a member-declaration, the 6408 // nested-name-specifier shall name a base class of the class 6409 // being defined. 6410 6411 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6412 cast<CXXRecordDecl>(NamedContext))) { 6413 if (CurContext == NamedContext) { 6414 Diag(NameLoc, 6415 diag::err_using_decl_nested_name_specifier_is_current_class) 6416 << SS.getRange(); 6417 return true; 6418 } 6419 6420 Diag(SS.getRange().getBegin(), 6421 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6422 << (NestedNameSpecifier*) SS.getScopeRep() 6423 << cast<CXXRecordDecl>(CurContext) 6424 << SS.getRange(); 6425 return true; 6426 } 6427 6428 return false; 6429 } 6430 6431 // C++03 [namespace.udecl]p4: 6432 // A using-declaration used as a member-declaration shall refer 6433 // to a member of a base class of the class being defined [etc.]. 6434 6435 // Salient point: SS doesn't have to name a base class as long as 6436 // lookup only finds members from base classes. Therefore we can 6437 // diagnose here only if we can prove that that can't happen, 6438 // i.e. if the class hierarchies provably don't intersect. 6439 6440 // TODO: it would be nice if "definitely valid" results were cached 6441 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6442 // need to be repeated. 6443 6444 struct UserData { 6445 llvm::DenseSet<const CXXRecordDecl*> Bases; 6446 6447 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6448 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6449 Data->Bases.insert(Base); 6450 return true; 6451 } 6452 6453 bool hasDependentBases(const CXXRecordDecl *Class) { 6454 return !Class->forallBases(collect, this); 6455 } 6456 6457 /// Returns true if the base is dependent or is one of the 6458 /// accumulated base classes. 6459 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6460 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6461 return !Data->Bases.count(Base); 6462 } 6463 6464 bool mightShareBases(const CXXRecordDecl *Class) { 6465 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6466 } 6467 }; 6468 6469 UserData Data; 6470 6471 // Returns false if we find a dependent base. 6472 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6473 return false; 6474 6475 // Returns false if the class has a dependent base or if it or one 6476 // of its bases is present in the base set of the current context. 6477 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6478 return false; 6479 6480 Diag(SS.getRange().getBegin(), 6481 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6482 << (NestedNameSpecifier*) SS.getScopeRep() 6483 << cast<CXXRecordDecl>(CurContext) 6484 << SS.getRange(); 6485 6486 return true; 6487} 6488 6489Decl *Sema::ActOnAliasDeclaration(Scope *S, 6490 AccessSpecifier AS, 6491 MultiTemplateParamsArg TemplateParamLists, 6492 SourceLocation UsingLoc, 6493 UnqualifiedId &Name, 6494 TypeResult Type) { 6495 // Skip up to the relevant declaration scope. 6496 while (S->getFlags() & Scope::TemplateParamScope) 6497 S = S->getParent(); 6498 assert((S->getFlags() & Scope::DeclScope) && 6499 "got alias-declaration outside of declaration scope"); 6500 6501 if (Type.isInvalid()) 6502 return 0; 6503 6504 bool Invalid = false; 6505 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6506 TypeSourceInfo *TInfo = 0; 6507 GetTypeFromParser(Type.get(), &TInfo); 6508 6509 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6510 return 0; 6511 6512 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6513 UPPC_DeclarationType)) { 6514 Invalid = true; 6515 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6516 TInfo->getTypeLoc().getBeginLoc()); 6517 } 6518 6519 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6520 LookupName(Previous, S); 6521 6522 // Warn about shadowing the name of a template parameter. 6523 if (Previous.isSingleResult() && 6524 Previous.getFoundDecl()->isTemplateParameter()) { 6525 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6526 Previous.clear(); 6527 } 6528 6529 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6530 "name in alias declaration must be an identifier"); 6531 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6532 Name.StartLocation, 6533 Name.Identifier, TInfo); 6534 6535 NewTD->setAccess(AS); 6536 6537 if (Invalid) 6538 NewTD->setInvalidDecl(); 6539 6540 CheckTypedefForVariablyModifiedType(S, NewTD); 6541 Invalid |= NewTD->isInvalidDecl(); 6542 6543 bool Redeclaration = false; 6544 6545 NamedDecl *NewND; 6546 if (TemplateParamLists.size()) { 6547 TypeAliasTemplateDecl *OldDecl = 0; 6548 TemplateParameterList *OldTemplateParams = 0; 6549 6550 if (TemplateParamLists.size() != 1) { 6551 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6552 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6553 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6554 } 6555 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6556 6557 // Only consider previous declarations in the same scope. 6558 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6559 /*ExplicitInstantiationOrSpecialization*/false); 6560 if (!Previous.empty()) { 6561 Redeclaration = true; 6562 6563 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6564 if (!OldDecl && !Invalid) { 6565 Diag(UsingLoc, diag::err_redefinition_different_kind) 6566 << Name.Identifier; 6567 6568 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6569 if (OldD->getLocation().isValid()) 6570 Diag(OldD->getLocation(), diag::note_previous_definition); 6571 6572 Invalid = true; 6573 } 6574 6575 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6576 if (TemplateParameterListsAreEqual(TemplateParams, 6577 OldDecl->getTemplateParameters(), 6578 /*Complain=*/true, 6579 TPL_TemplateMatch)) 6580 OldTemplateParams = OldDecl->getTemplateParameters(); 6581 else 6582 Invalid = true; 6583 6584 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6585 if (!Invalid && 6586 !Context.hasSameType(OldTD->getUnderlyingType(), 6587 NewTD->getUnderlyingType())) { 6588 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6589 // but we can't reasonably accept it. 6590 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6591 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6592 if (OldTD->getLocation().isValid()) 6593 Diag(OldTD->getLocation(), diag::note_previous_definition); 6594 Invalid = true; 6595 } 6596 } 6597 } 6598 6599 // Merge any previous default template arguments into our parameters, 6600 // and check the parameter list. 6601 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6602 TPC_TypeAliasTemplate)) 6603 return 0; 6604 6605 TypeAliasTemplateDecl *NewDecl = 6606 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6607 Name.Identifier, TemplateParams, 6608 NewTD); 6609 6610 NewDecl->setAccess(AS); 6611 6612 if (Invalid) 6613 NewDecl->setInvalidDecl(); 6614 else if (OldDecl) 6615 NewDecl->setPreviousDeclaration(OldDecl); 6616 6617 NewND = NewDecl; 6618 } else { 6619 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6620 NewND = NewTD; 6621 } 6622 6623 if (!Redeclaration) 6624 PushOnScopeChains(NewND, S); 6625 6626 return NewND; 6627} 6628 6629Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6630 SourceLocation NamespaceLoc, 6631 SourceLocation AliasLoc, 6632 IdentifierInfo *Alias, 6633 CXXScopeSpec &SS, 6634 SourceLocation IdentLoc, 6635 IdentifierInfo *Ident) { 6636 6637 // Lookup the namespace name. 6638 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6639 LookupParsedName(R, S, &SS); 6640 6641 // Check if we have a previous declaration with the same name. 6642 NamedDecl *PrevDecl 6643 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6644 ForRedeclaration); 6645 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6646 PrevDecl = 0; 6647 6648 if (PrevDecl) { 6649 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6650 // We already have an alias with the same name that points to the same 6651 // namespace, so don't create a new one. 6652 // FIXME: At some point, we'll want to create the (redundant) 6653 // declaration to maintain better source information. 6654 if (!R.isAmbiguous() && !R.empty() && 6655 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6656 return 0; 6657 } 6658 6659 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6660 diag::err_redefinition_different_kind; 6661 Diag(AliasLoc, DiagID) << Alias; 6662 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6663 return 0; 6664 } 6665 6666 if (R.isAmbiguous()) 6667 return 0; 6668 6669 if (R.empty()) { 6670 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6671 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6672 return 0; 6673 } 6674 } 6675 6676 NamespaceAliasDecl *AliasDecl = 6677 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6678 Alias, SS.getWithLocInContext(Context), 6679 IdentLoc, R.getFoundDecl()); 6680 6681 PushOnScopeChains(AliasDecl, S); 6682 return AliasDecl; 6683} 6684 6685namespace { 6686 /// \brief Scoped object used to handle the state changes required in Sema 6687 /// to implicitly define the body of a C++ member function; 6688 class ImplicitlyDefinedFunctionScope { 6689 Sema &S; 6690 Sema::ContextRAII SavedContext; 6691 6692 public: 6693 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6694 : S(S), SavedContext(S, Method) 6695 { 6696 S.PushFunctionScope(); 6697 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6698 } 6699 6700 ~ImplicitlyDefinedFunctionScope() { 6701 S.PopExpressionEvaluationContext(); 6702 S.PopFunctionOrBlockScope(); 6703 } 6704 }; 6705} 6706 6707Sema::ImplicitExceptionSpecification 6708Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6709 // C++ [except.spec]p14: 6710 // An implicitly declared special member function (Clause 12) shall have an 6711 // exception-specification. [...] 6712 ImplicitExceptionSpecification ExceptSpec(Context); 6713 if (ClassDecl->isInvalidDecl()) 6714 return ExceptSpec; 6715 6716 // Direct base-class constructors. 6717 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6718 BEnd = ClassDecl->bases_end(); 6719 B != BEnd; ++B) { 6720 if (B->isVirtual()) // Handled below. 6721 continue; 6722 6723 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6724 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6725 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6726 // If this is a deleted function, add it anyway. This might be conformant 6727 // with the standard. This might not. I'm not sure. It might not matter. 6728 if (Constructor) 6729 ExceptSpec.CalledDecl(Constructor); 6730 } 6731 } 6732 6733 // Virtual base-class constructors. 6734 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6735 BEnd = ClassDecl->vbases_end(); 6736 B != BEnd; ++B) { 6737 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6738 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6739 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6740 // If this is a deleted function, add it anyway. This might be conformant 6741 // with the standard. This might not. I'm not sure. It might not matter. 6742 if (Constructor) 6743 ExceptSpec.CalledDecl(Constructor); 6744 } 6745 } 6746 6747 // Field constructors. 6748 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6749 FEnd = ClassDecl->field_end(); 6750 F != FEnd; ++F) { 6751 if (F->hasInClassInitializer()) { 6752 if (Expr *E = F->getInClassInitializer()) 6753 ExceptSpec.CalledExpr(E); 6754 else if (!F->isInvalidDecl()) 6755 ExceptSpec.SetDelayed(); 6756 } else if (const RecordType *RecordTy 6757 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6758 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6759 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6760 // If this is a deleted function, add it anyway. This might be conformant 6761 // with the standard. This might not. I'm not sure. It might not matter. 6762 // In particular, the problem is that this function never gets called. It 6763 // might just be ill-formed because this function attempts to refer to 6764 // a deleted function here. 6765 if (Constructor) 6766 ExceptSpec.CalledDecl(Constructor); 6767 } 6768 } 6769 6770 return ExceptSpec; 6771} 6772 6773CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6774 CXXRecordDecl *ClassDecl) { 6775 // C++ [class.ctor]p5: 6776 // A default constructor for a class X is a constructor of class X 6777 // that can be called without an argument. If there is no 6778 // user-declared constructor for class X, a default constructor is 6779 // implicitly declared. An implicitly-declared default constructor 6780 // is an inline public member of its class. 6781 assert(!ClassDecl->hasUserDeclaredConstructor() && 6782 "Should not build implicit default constructor!"); 6783 6784 ImplicitExceptionSpecification Spec = 6785 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6786 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6787 6788 // Create the actual constructor declaration. 6789 CanQualType ClassType 6790 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6791 SourceLocation ClassLoc = ClassDecl->getLocation(); 6792 DeclarationName Name 6793 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6794 DeclarationNameInfo NameInfo(Name, ClassLoc); 6795 CXXConstructorDecl *DefaultCon 6796 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6797 Context.getFunctionType(Context.VoidTy, 6798 0, 0, EPI), 6799 /*TInfo=*/0, 6800 /*isExplicit=*/false, 6801 /*isInline=*/true, 6802 /*isImplicitlyDeclared=*/true, 6803 // FIXME: apply the rules for definitions here 6804 /*isConstexpr=*/false); 6805 DefaultCon->setAccess(AS_public); 6806 DefaultCon->setDefaulted(); 6807 DefaultCon->setImplicit(); 6808 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6809 6810 // Note that we have declared this constructor. 6811 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6812 6813 if (Scope *S = getScopeForContext(ClassDecl)) 6814 PushOnScopeChains(DefaultCon, S, false); 6815 ClassDecl->addDecl(DefaultCon); 6816 6817 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6818 DefaultCon->setDeletedAsWritten(); 6819 6820 return DefaultCon; 6821} 6822 6823void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6824 CXXConstructorDecl *Constructor) { 6825 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6826 !Constructor->doesThisDeclarationHaveABody() && 6827 !Constructor->isDeleted()) && 6828 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6829 6830 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6831 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6832 6833 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6834 DiagnosticErrorTrap Trap(Diags); 6835 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6836 Trap.hasErrorOccurred()) { 6837 Diag(CurrentLocation, diag::note_member_synthesized_at) 6838 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6839 Constructor->setInvalidDecl(); 6840 return; 6841 } 6842 6843 SourceLocation Loc = Constructor->getLocation(); 6844 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6845 6846 Constructor->setUsed(); 6847 MarkVTableUsed(CurrentLocation, ClassDecl); 6848 6849 if (ASTMutationListener *L = getASTMutationListener()) { 6850 L->CompletedImplicitDefinition(Constructor); 6851 } 6852} 6853 6854/// Get any existing defaulted default constructor for the given class. Do not 6855/// implicitly define one if it does not exist. 6856static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6857 CXXRecordDecl *D) { 6858 ASTContext &Context = Self.Context; 6859 QualType ClassType = Context.getTypeDeclType(D); 6860 DeclarationName ConstructorName 6861 = Context.DeclarationNames.getCXXConstructorName( 6862 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6863 6864 DeclContext::lookup_const_iterator Con, ConEnd; 6865 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6866 Con != ConEnd; ++Con) { 6867 // A function template cannot be defaulted. 6868 if (isa<FunctionTemplateDecl>(*Con)) 6869 continue; 6870 6871 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6872 if (Constructor->isDefaultConstructor()) 6873 return Constructor->isDefaulted() ? Constructor : 0; 6874 } 6875 return 0; 6876} 6877 6878void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6879 if (!D) return; 6880 AdjustDeclIfTemplate(D); 6881 6882 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6883 CXXConstructorDecl *CtorDecl 6884 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6885 6886 if (!CtorDecl) return; 6887 6888 // Compute the exception specification for the default constructor. 6889 const FunctionProtoType *CtorTy = 6890 CtorDecl->getType()->castAs<FunctionProtoType>(); 6891 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6892 ImplicitExceptionSpecification Spec = 6893 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6894 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6895 assert(EPI.ExceptionSpecType != EST_Delayed); 6896 6897 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6898 } 6899 6900 // If the default constructor is explicitly defaulted, checking the exception 6901 // specification is deferred until now. 6902 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6903 !ClassDecl->isDependentType()) 6904 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6905} 6906 6907void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6908 // We start with an initial pass over the base classes to collect those that 6909 // inherit constructors from. If there are none, we can forgo all further 6910 // processing. 6911 typedef SmallVector<const RecordType *, 4> BasesVector; 6912 BasesVector BasesToInheritFrom; 6913 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6914 BaseE = ClassDecl->bases_end(); 6915 BaseIt != BaseE; ++BaseIt) { 6916 if (BaseIt->getInheritConstructors()) { 6917 QualType Base = BaseIt->getType(); 6918 if (Base->isDependentType()) { 6919 // If we inherit constructors from anything that is dependent, just 6920 // abort processing altogether. We'll get another chance for the 6921 // instantiations. 6922 return; 6923 } 6924 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6925 } 6926 } 6927 if (BasesToInheritFrom.empty()) 6928 return; 6929 6930 // Now collect the constructors that we already have in the current class. 6931 // Those take precedence over inherited constructors. 6932 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6933 // unless there is a user-declared constructor with the same signature in 6934 // the class where the using-declaration appears. 6935 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6936 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6937 CtorE = ClassDecl->ctor_end(); 6938 CtorIt != CtorE; ++CtorIt) { 6939 ExistingConstructors.insert( 6940 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6941 } 6942 6943 Scope *S = getScopeForContext(ClassDecl); 6944 DeclarationName CreatedCtorName = 6945 Context.DeclarationNames.getCXXConstructorName( 6946 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6947 6948 // Now comes the true work. 6949 // First, we keep a map from constructor types to the base that introduced 6950 // them. Needed for finding conflicting constructors. We also keep the 6951 // actually inserted declarations in there, for pretty diagnostics. 6952 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6953 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6954 ConstructorToSourceMap InheritedConstructors; 6955 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6956 BaseE = BasesToInheritFrom.end(); 6957 BaseIt != BaseE; ++BaseIt) { 6958 const RecordType *Base = *BaseIt; 6959 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6960 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6961 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6962 CtorE = BaseDecl->ctor_end(); 6963 CtorIt != CtorE; ++CtorIt) { 6964 // Find the using declaration for inheriting this base's constructors. 6965 DeclarationName Name = 6966 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6967 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6968 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6969 SourceLocation UsingLoc = UD ? UD->getLocation() : 6970 ClassDecl->getLocation(); 6971 6972 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6973 // from the class X named in the using-declaration consists of actual 6974 // constructors and notional constructors that result from the 6975 // transformation of defaulted parameters as follows: 6976 // - all non-template default constructors of X, and 6977 // - for each non-template constructor of X that has at least one 6978 // parameter with a default argument, the set of constructors that 6979 // results from omitting any ellipsis parameter specification and 6980 // successively omitting parameters with a default argument from the 6981 // end of the parameter-type-list. 6982 CXXConstructorDecl *BaseCtor = *CtorIt; 6983 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6984 const FunctionProtoType *BaseCtorType = 6985 BaseCtor->getType()->getAs<FunctionProtoType>(); 6986 6987 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6988 maxParams = BaseCtor->getNumParams(); 6989 params <= maxParams; ++params) { 6990 // Skip default constructors. They're never inherited. 6991 if (params == 0) 6992 continue; 6993 // Skip copy and move constructors for the same reason. 6994 if (CanBeCopyOrMove && params == 1) 6995 continue; 6996 6997 // Build up a function type for this particular constructor. 6998 // FIXME: The working paper does not consider that the exception spec 6999 // for the inheriting constructor might be larger than that of the 7000 // source. This code doesn't yet, either. When it does, this code will 7001 // need to be delayed until after exception specifications and in-class 7002 // member initializers are attached. 7003 const Type *NewCtorType; 7004 if (params == maxParams) 7005 NewCtorType = BaseCtorType; 7006 else { 7007 SmallVector<QualType, 16> Args; 7008 for (unsigned i = 0; i < params; ++i) { 7009 Args.push_back(BaseCtorType->getArgType(i)); 7010 } 7011 FunctionProtoType::ExtProtoInfo ExtInfo = 7012 BaseCtorType->getExtProtoInfo(); 7013 ExtInfo.Variadic = false; 7014 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7015 Args.data(), params, ExtInfo) 7016 .getTypePtr(); 7017 } 7018 const Type *CanonicalNewCtorType = 7019 Context.getCanonicalType(NewCtorType); 7020 7021 // Now that we have the type, first check if the class already has a 7022 // constructor with this signature. 7023 if (ExistingConstructors.count(CanonicalNewCtorType)) 7024 continue; 7025 7026 // Then we check if we have already declared an inherited constructor 7027 // with this signature. 7028 std::pair<ConstructorToSourceMap::iterator, bool> result = 7029 InheritedConstructors.insert(std::make_pair( 7030 CanonicalNewCtorType, 7031 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7032 if (!result.second) { 7033 // Already in the map. If it came from a different class, that's an 7034 // error. Not if it's from the same. 7035 CanQualType PreviousBase = result.first->second.first; 7036 if (CanonicalBase != PreviousBase) { 7037 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7038 const CXXConstructorDecl *PrevBaseCtor = 7039 PrevCtor->getInheritedConstructor(); 7040 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7041 7042 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7043 Diag(BaseCtor->getLocation(), 7044 diag::note_using_decl_constructor_conflict_current_ctor); 7045 Diag(PrevBaseCtor->getLocation(), 7046 diag::note_using_decl_constructor_conflict_previous_ctor); 7047 Diag(PrevCtor->getLocation(), 7048 diag::note_using_decl_constructor_conflict_previous_using); 7049 } 7050 continue; 7051 } 7052 7053 // OK, we're there, now add the constructor. 7054 // C++0x [class.inhctor]p8: [...] that would be performed by a 7055 // user-written inline constructor [...] 7056 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7057 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7058 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7059 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7060 /*ImplicitlyDeclared=*/true, 7061 // FIXME: Due to a defect in the standard, we treat inherited 7062 // constructors as constexpr even if that makes them ill-formed. 7063 /*Constexpr=*/BaseCtor->isConstexpr()); 7064 NewCtor->setAccess(BaseCtor->getAccess()); 7065 7066 // Build up the parameter decls and add them. 7067 SmallVector<ParmVarDecl *, 16> ParamDecls; 7068 for (unsigned i = 0; i < params; ++i) { 7069 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7070 UsingLoc, UsingLoc, 7071 /*IdentifierInfo=*/0, 7072 BaseCtorType->getArgType(i), 7073 /*TInfo=*/0, SC_None, 7074 SC_None, /*DefaultArg=*/0)); 7075 } 7076 NewCtor->setParams(ParamDecls); 7077 NewCtor->setInheritedConstructor(BaseCtor); 7078 7079 PushOnScopeChains(NewCtor, S, false); 7080 ClassDecl->addDecl(NewCtor); 7081 result.first->second.second = NewCtor; 7082 } 7083 } 7084 } 7085} 7086 7087Sema::ImplicitExceptionSpecification 7088Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7089 // C++ [except.spec]p14: 7090 // An implicitly declared special member function (Clause 12) shall have 7091 // an exception-specification. 7092 ImplicitExceptionSpecification ExceptSpec(Context); 7093 if (ClassDecl->isInvalidDecl()) 7094 return ExceptSpec; 7095 7096 // Direct base-class destructors. 7097 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7098 BEnd = ClassDecl->bases_end(); 7099 B != BEnd; ++B) { 7100 if (B->isVirtual()) // Handled below. 7101 continue; 7102 7103 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7104 ExceptSpec.CalledDecl( 7105 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7106 } 7107 7108 // Virtual base-class destructors. 7109 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7110 BEnd = ClassDecl->vbases_end(); 7111 B != BEnd; ++B) { 7112 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7113 ExceptSpec.CalledDecl( 7114 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7115 } 7116 7117 // Field destructors. 7118 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7119 FEnd = ClassDecl->field_end(); 7120 F != FEnd; ++F) { 7121 if (const RecordType *RecordTy 7122 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7123 ExceptSpec.CalledDecl( 7124 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7125 } 7126 7127 return ExceptSpec; 7128} 7129 7130CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7131 // C++ [class.dtor]p2: 7132 // If a class has no user-declared destructor, a destructor is 7133 // declared implicitly. An implicitly-declared destructor is an 7134 // inline public member of its class. 7135 7136 ImplicitExceptionSpecification Spec = 7137 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7138 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7139 7140 // Create the actual destructor declaration. 7141 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7142 7143 CanQualType ClassType 7144 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7145 SourceLocation ClassLoc = ClassDecl->getLocation(); 7146 DeclarationName Name 7147 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7148 DeclarationNameInfo NameInfo(Name, ClassLoc); 7149 CXXDestructorDecl *Destructor 7150 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7151 /*isInline=*/true, 7152 /*isImplicitlyDeclared=*/true); 7153 Destructor->setAccess(AS_public); 7154 Destructor->setDefaulted(); 7155 Destructor->setImplicit(); 7156 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7157 7158 // Note that we have declared this destructor. 7159 ++ASTContext::NumImplicitDestructorsDeclared; 7160 7161 // Introduce this destructor into its scope. 7162 if (Scope *S = getScopeForContext(ClassDecl)) 7163 PushOnScopeChains(Destructor, S, false); 7164 ClassDecl->addDecl(Destructor); 7165 7166 // This could be uniqued if it ever proves significant. 7167 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7168 7169 if (ShouldDeleteDestructor(Destructor)) 7170 Destructor->setDeletedAsWritten(); 7171 7172 AddOverriddenMethods(ClassDecl, Destructor); 7173 7174 return Destructor; 7175} 7176 7177void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7178 CXXDestructorDecl *Destructor) { 7179 assert((Destructor->isDefaulted() && 7180 !Destructor->doesThisDeclarationHaveABody()) && 7181 "DefineImplicitDestructor - call it for implicit default dtor"); 7182 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7183 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7184 7185 if (Destructor->isInvalidDecl()) 7186 return; 7187 7188 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7189 7190 DiagnosticErrorTrap Trap(Diags); 7191 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7192 Destructor->getParent()); 7193 7194 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7195 Diag(CurrentLocation, diag::note_member_synthesized_at) 7196 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7197 7198 Destructor->setInvalidDecl(); 7199 return; 7200 } 7201 7202 SourceLocation Loc = Destructor->getLocation(); 7203 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7204 Destructor->setImplicitlyDefined(true); 7205 Destructor->setUsed(); 7206 MarkVTableUsed(CurrentLocation, ClassDecl); 7207 7208 if (ASTMutationListener *L = getASTMutationListener()) { 7209 L->CompletedImplicitDefinition(Destructor); 7210 } 7211} 7212 7213void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7214 CXXDestructorDecl *destructor) { 7215 // C++11 [class.dtor]p3: 7216 // A declaration of a destructor that does not have an exception- 7217 // specification is implicitly considered to have the same exception- 7218 // specification as an implicit declaration. 7219 const FunctionProtoType *dtorType = destructor->getType()-> 7220 getAs<FunctionProtoType>(); 7221 if (dtorType->hasExceptionSpec()) 7222 return; 7223 7224 ImplicitExceptionSpecification exceptSpec = 7225 ComputeDefaultedDtorExceptionSpec(classDecl); 7226 7227 // Replace the destructor's type, building off the existing one. Fortunately, 7228 // the only thing of interest in the destructor type is its extended info. 7229 // The return and arguments are fixed. 7230 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7231 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7232 epi.NumExceptions = exceptSpec.size(); 7233 epi.Exceptions = exceptSpec.data(); 7234 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7235 7236 destructor->setType(ty); 7237 7238 // FIXME: If the destructor has a body that could throw, and the newly created 7239 // spec doesn't allow exceptions, we should emit a warning, because this 7240 // change in behavior can break conforming C++03 programs at runtime. 7241 // However, we don't have a body yet, so it needs to be done somewhere else. 7242} 7243 7244/// \brief Builds a statement that copies/moves the given entity from \p From to 7245/// \c To. 7246/// 7247/// This routine is used to copy/move the members of a class with an 7248/// implicitly-declared copy/move assignment operator. When the entities being 7249/// copied are arrays, this routine builds for loops to copy them. 7250/// 7251/// \param S The Sema object used for type-checking. 7252/// 7253/// \param Loc The location where the implicit copy/move is being generated. 7254/// 7255/// \param T The type of the expressions being copied/moved. Both expressions 7256/// must have this type. 7257/// 7258/// \param To The expression we are copying/moving to. 7259/// 7260/// \param From The expression we are copying/moving from. 7261/// 7262/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7263/// Otherwise, it's a non-static member subobject. 7264/// 7265/// \param Copying Whether we're copying or moving. 7266/// 7267/// \param Depth Internal parameter recording the depth of the recursion. 7268/// 7269/// \returns A statement or a loop that copies the expressions. 7270static StmtResult 7271BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7272 Expr *To, Expr *From, 7273 bool CopyingBaseSubobject, bool Copying, 7274 unsigned Depth = 0) { 7275 // C++0x [class.copy]p28: 7276 // Each subobject is assigned in the manner appropriate to its type: 7277 // 7278 // - if the subobject is of class type, as if by a call to operator= with 7279 // the subobject as the object expression and the corresponding 7280 // subobject of x as a single function argument (as if by explicit 7281 // qualification; that is, ignoring any possible virtual overriding 7282 // functions in more derived classes); 7283 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7284 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7285 7286 // Look for operator=. 7287 DeclarationName Name 7288 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7289 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7290 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7291 7292 // Filter out any result that isn't a copy/move-assignment operator. 7293 LookupResult::Filter F = OpLookup.makeFilter(); 7294 while (F.hasNext()) { 7295 NamedDecl *D = F.next(); 7296 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7297 if (Copying ? Method->isCopyAssignmentOperator() : 7298 Method->isMoveAssignmentOperator()) 7299 continue; 7300 7301 F.erase(); 7302 } 7303 F.done(); 7304 7305 // Suppress the protected check (C++ [class.protected]) for each of the 7306 // assignment operators we found. This strange dance is required when 7307 // we're assigning via a base classes's copy-assignment operator. To 7308 // ensure that we're getting the right base class subobject (without 7309 // ambiguities), we need to cast "this" to that subobject type; to 7310 // ensure that we don't go through the virtual call mechanism, we need 7311 // to qualify the operator= name with the base class (see below). However, 7312 // this means that if the base class has a protected copy assignment 7313 // operator, the protected member access check will fail. So, we 7314 // rewrite "protected" access to "public" access in this case, since we 7315 // know by construction that we're calling from a derived class. 7316 if (CopyingBaseSubobject) { 7317 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7318 L != LEnd; ++L) { 7319 if (L.getAccess() == AS_protected) 7320 L.setAccess(AS_public); 7321 } 7322 } 7323 7324 // Create the nested-name-specifier that will be used to qualify the 7325 // reference to operator=; this is required to suppress the virtual 7326 // call mechanism. 7327 CXXScopeSpec SS; 7328 SS.MakeTrivial(S.Context, 7329 NestedNameSpecifier::Create(S.Context, 0, false, 7330 T.getTypePtr()), 7331 Loc); 7332 7333 // Create the reference to operator=. 7334 ExprResult OpEqualRef 7335 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7336 /*FirstQualifierInScope=*/0, OpLookup, 7337 /*TemplateArgs=*/0, 7338 /*SuppressQualifierCheck=*/true); 7339 if (OpEqualRef.isInvalid()) 7340 return StmtError(); 7341 7342 // Build the call to the assignment operator. 7343 7344 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7345 OpEqualRef.takeAs<Expr>(), 7346 Loc, &From, 1, Loc); 7347 if (Call.isInvalid()) 7348 return StmtError(); 7349 7350 return S.Owned(Call.takeAs<Stmt>()); 7351 } 7352 7353 // - if the subobject is of scalar type, the built-in assignment 7354 // operator is used. 7355 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7356 if (!ArrayTy) { 7357 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7358 if (Assignment.isInvalid()) 7359 return StmtError(); 7360 7361 return S.Owned(Assignment.takeAs<Stmt>()); 7362 } 7363 7364 // - if the subobject is an array, each element is assigned, in the 7365 // manner appropriate to the element type; 7366 7367 // Construct a loop over the array bounds, e.g., 7368 // 7369 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7370 // 7371 // that will copy each of the array elements. 7372 QualType SizeType = S.Context.getSizeType(); 7373 7374 // Create the iteration variable. 7375 IdentifierInfo *IterationVarName = 0; 7376 { 7377 llvm::SmallString<8> Str; 7378 llvm::raw_svector_ostream OS(Str); 7379 OS << "__i" << Depth; 7380 IterationVarName = &S.Context.Idents.get(OS.str()); 7381 } 7382 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7383 IterationVarName, SizeType, 7384 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7385 SC_None, SC_None); 7386 7387 // Initialize the iteration variable to zero. 7388 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7389 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7390 7391 // Create a reference to the iteration variable; we'll use this several 7392 // times throughout. 7393 Expr *IterationVarRef 7394 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7395 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7396 7397 // Create the DeclStmt that holds the iteration variable. 7398 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7399 7400 // Create the comparison against the array bound. 7401 llvm::APInt Upper 7402 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7403 Expr *Comparison 7404 = new (S.Context) BinaryOperator(IterationVarRef, 7405 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7406 BO_NE, S.Context.BoolTy, 7407 VK_RValue, OK_Ordinary, Loc); 7408 7409 // Create the pre-increment of the iteration variable. 7410 Expr *Increment 7411 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7412 VK_LValue, OK_Ordinary, Loc); 7413 7414 // Subscript the "from" and "to" expressions with the iteration variable. 7415 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7416 IterationVarRef, Loc)); 7417 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7418 IterationVarRef, Loc)); 7419 if (!Copying) // Cast to rvalue 7420 From = CastForMoving(S, From); 7421 7422 // Build the copy/move for an individual element of the array. 7423 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7424 To, From, CopyingBaseSubobject, 7425 Copying, Depth + 1); 7426 if (Copy.isInvalid()) 7427 return StmtError(); 7428 7429 // Construct the loop that copies all elements of this array. 7430 return S.ActOnForStmt(Loc, Loc, InitStmt, 7431 S.MakeFullExpr(Comparison), 7432 0, S.MakeFullExpr(Increment), 7433 Loc, Copy.take()); 7434} 7435 7436std::pair<Sema::ImplicitExceptionSpecification, bool> 7437Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7438 CXXRecordDecl *ClassDecl) { 7439 if (ClassDecl->isInvalidDecl()) 7440 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7441 7442 // C++ [class.copy]p10: 7443 // If the class definition does not explicitly declare a copy 7444 // assignment operator, one is declared implicitly. 7445 // The implicitly-defined copy assignment operator for a class X 7446 // will have the form 7447 // 7448 // X& X::operator=(const X&) 7449 // 7450 // if 7451 bool HasConstCopyAssignment = true; 7452 7453 // -- each direct base class B of X has a copy assignment operator 7454 // whose parameter is of type const B&, const volatile B& or B, 7455 // and 7456 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7457 BaseEnd = ClassDecl->bases_end(); 7458 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7459 // We'll handle this below 7460 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7461 continue; 7462 7463 assert(!Base->getType()->isDependentType() && 7464 "Cannot generate implicit members for class with dependent bases."); 7465 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7466 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7467 &HasConstCopyAssignment); 7468 } 7469 7470 // In C++11, the above citation has "or virtual" added 7471 if (LangOpts.CPlusPlus0x) { 7472 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7473 BaseEnd = ClassDecl->vbases_end(); 7474 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7475 assert(!Base->getType()->isDependentType() && 7476 "Cannot generate implicit members for class with dependent bases."); 7477 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7478 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7479 &HasConstCopyAssignment); 7480 } 7481 } 7482 7483 // -- for all the nonstatic data members of X that are of a class 7484 // type M (or array thereof), each such class type has a copy 7485 // assignment operator whose parameter is of type const M&, 7486 // const volatile M& or M. 7487 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7488 FieldEnd = ClassDecl->field_end(); 7489 HasConstCopyAssignment && Field != FieldEnd; 7490 ++Field) { 7491 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7492 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7493 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7494 &HasConstCopyAssignment); 7495 } 7496 } 7497 7498 // Otherwise, the implicitly declared copy assignment operator will 7499 // have the form 7500 // 7501 // X& X::operator=(X&) 7502 7503 // C++ [except.spec]p14: 7504 // An implicitly declared special member function (Clause 12) shall have an 7505 // exception-specification. [...] 7506 7507 // It is unspecified whether or not an implicit copy assignment operator 7508 // attempts to deduplicate calls to assignment operators of virtual bases are 7509 // made. As such, this exception specification is effectively unspecified. 7510 // Based on a similar decision made for constness in C++0x, we're erring on 7511 // the side of assuming such calls to be made regardless of whether they 7512 // actually happen. 7513 ImplicitExceptionSpecification ExceptSpec(Context); 7514 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7515 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7516 BaseEnd = ClassDecl->bases_end(); 7517 Base != BaseEnd; ++Base) { 7518 if (Base->isVirtual()) 7519 continue; 7520 7521 CXXRecordDecl *BaseClassDecl 7522 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7523 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7524 ArgQuals, false, 0)) 7525 ExceptSpec.CalledDecl(CopyAssign); 7526 } 7527 7528 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7529 BaseEnd = ClassDecl->vbases_end(); 7530 Base != BaseEnd; ++Base) { 7531 CXXRecordDecl *BaseClassDecl 7532 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7533 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7534 ArgQuals, false, 0)) 7535 ExceptSpec.CalledDecl(CopyAssign); 7536 } 7537 7538 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7539 FieldEnd = ClassDecl->field_end(); 7540 Field != FieldEnd; 7541 ++Field) { 7542 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7543 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7544 if (CXXMethodDecl *CopyAssign = 7545 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7546 ExceptSpec.CalledDecl(CopyAssign); 7547 } 7548 } 7549 7550 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7551} 7552 7553CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7554 // Note: The following rules are largely analoguous to the copy 7555 // constructor rules. Note that virtual bases are not taken into account 7556 // for determining the argument type of the operator. Note also that 7557 // operators taking an object instead of a reference are allowed. 7558 7559 ImplicitExceptionSpecification Spec(Context); 7560 bool Const; 7561 llvm::tie(Spec, Const) = 7562 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7563 7564 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7565 QualType RetType = Context.getLValueReferenceType(ArgType); 7566 if (Const) 7567 ArgType = ArgType.withConst(); 7568 ArgType = Context.getLValueReferenceType(ArgType); 7569 7570 // An implicitly-declared copy assignment operator is an inline public 7571 // member of its class. 7572 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7573 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7574 SourceLocation ClassLoc = ClassDecl->getLocation(); 7575 DeclarationNameInfo NameInfo(Name, ClassLoc); 7576 CXXMethodDecl *CopyAssignment 7577 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7578 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7579 /*TInfo=*/0, /*isStatic=*/false, 7580 /*StorageClassAsWritten=*/SC_None, 7581 /*isInline=*/true, /*isConstexpr=*/false, 7582 SourceLocation()); 7583 CopyAssignment->setAccess(AS_public); 7584 CopyAssignment->setDefaulted(); 7585 CopyAssignment->setImplicit(); 7586 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7587 7588 // Add the parameter to the operator. 7589 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7590 ClassLoc, ClassLoc, /*Id=*/0, 7591 ArgType, /*TInfo=*/0, 7592 SC_None, 7593 SC_None, 0); 7594 CopyAssignment->setParams(FromParam); 7595 7596 // Note that we have added this copy-assignment operator. 7597 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7598 7599 if (Scope *S = getScopeForContext(ClassDecl)) 7600 PushOnScopeChains(CopyAssignment, S, false); 7601 ClassDecl->addDecl(CopyAssignment); 7602 7603 // C++0x [class.copy]p18: 7604 // ... If the class definition declares a move constructor or move 7605 // assignment operator, the implicitly declared copy assignment operator is 7606 // defined as deleted; ... 7607 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7608 ClassDecl->hasUserDeclaredMoveAssignment() || 7609 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7610 CopyAssignment->setDeletedAsWritten(); 7611 7612 AddOverriddenMethods(ClassDecl, CopyAssignment); 7613 return CopyAssignment; 7614} 7615 7616void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7617 CXXMethodDecl *CopyAssignOperator) { 7618 assert((CopyAssignOperator->isDefaulted() && 7619 CopyAssignOperator->isOverloadedOperator() && 7620 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7621 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7622 "DefineImplicitCopyAssignment called for wrong function"); 7623 7624 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7625 7626 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7627 CopyAssignOperator->setInvalidDecl(); 7628 return; 7629 } 7630 7631 CopyAssignOperator->setUsed(); 7632 7633 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7634 DiagnosticErrorTrap Trap(Diags); 7635 7636 // C++0x [class.copy]p30: 7637 // The implicitly-defined or explicitly-defaulted copy assignment operator 7638 // for a non-union class X performs memberwise copy assignment of its 7639 // subobjects. The direct base classes of X are assigned first, in the 7640 // order of their declaration in the base-specifier-list, and then the 7641 // immediate non-static data members of X are assigned, in the order in 7642 // which they were declared in the class definition. 7643 7644 // The statements that form the synthesized function body. 7645 ASTOwningVector<Stmt*> Statements(*this); 7646 7647 // The parameter for the "other" object, which we are copying from. 7648 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7649 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7650 QualType OtherRefType = Other->getType(); 7651 if (const LValueReferenceType *OtherRef 7652 = OtherRefType->getAs<LValueReferenceType>()) { 7653 OtherRefType = OtherRef->getPointeeType(); 7654 OtherQuals = OtherRefType.getQualifiers(); 7655 } 7656 7657 // Our location for everything implicitly-generated. 7658 SourceLocation Loc = CopyAssignOperator->getLocation(); 7659 7660 // Construct a reference to the "other" object. We'll be using this 7661 // throughout the generated ASTs. 7662 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7663 assert(OtherRef && "Reference to parameter cannot fail!"); 7664 7665 // Construct the "this" pointer. We'll be using this throughout the generated 7666 // ASTs. 7667 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7668 assert(This && "Reference to this cannot fail!"); 7669 7670 // Assign base classes. 7671 bool Invalid = false; 7672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7673 E = ClassDecl->bases_end(); Base != E; ++Base) { 7674 // Form the assignment: 7675 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7676 QualType BaseType = Base->getType().getUnqualifiedType(); 7677 if (!BaseType->isRecordType()) { 7678 Invalid = true; 7679 continue; 7680 } 7681 7682 CXXCastPath BasePath; 7683 BasePath.push_back(Base); 7684 7685 // Construct the "from" expression, which is an implicit cast to the 7686 // appropriately-qualified base type. 7687 Expr *From = OtherRef; 7688 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7689 CK_UncheckedDerivedToBase, 7690 VK_LValue, &BasePath).take(); 7691 7692 // Dereference "this". 7693 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7694 7695 // Implicitly cast "this" to the appropriately-qualified base type. 7696 To = ImpCastExprToType(To.take(), 7697 Context.getCVRQualifiedType(BaseType, 7698 CopyAssignOperator->getTypeQualifiers()), 7699 CK_UncheckedDerivedToBase, 7700 VK_LValue, &BasePath); 7701 7702 // Build the copy. 7703 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7704 To.get(), From, 7705 /*CopyingBaseSubobject=*/true, 7706 /*Copying=*/true); 7707 if (Copy.isInvalid()) { 7708 Diag(CurrentLocation, diag::note_member_synthesized_at) 7709 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7710 CopyAssignOperator->setInvalidDecl(); 7711 return; 7712 } 7713 7714 // Success! Record the copy. 7715 Statements.push_back(Copy.takeAs<Expr>()); 7716 } 7717 7718 // \brief Reference to the __builtin_memcpy function. 7719 Expr *BuiltinMemCpyRef = 0; 7720 // \brief Reference to the __builtin_objc_memmove_collectable function. 7721 Expr *CollectableMemCpyRef = 0; 7722 7723 // Assign non-static members. 7724 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7725 FieldEnd = ClassDecl->field_end(); 7726 Field != FieldEnd; ++Field) { 7727 if (Field->isUnnamedBitfield()) 7728 continue; 7729 7730 // Check for members of reference type; we can't copy those. 7731 if (Field->getType()->isReferenceType()) { 7732 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7733 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7734 Diag(Field->getLocation(), diag::note_declared_at); 7735 Diag(CurrentLocation, diag::note_member_synthesized_at) 7736 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7737 Invalid = true; 7738 continue; 7739 } 7740 7741 // Check for members of const-qualified, non-class type. 7742 QualType BaseType = Context.getBaseElementType(Field->getType()); 7743 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7744 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7745 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7746 Diag(Field->getLocation(), diag::note_declared_at); 7747 Diag(CurrentLocation, diag::note_member_synthesized_at) 7748 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7749 Invalid = true; 7750 continue; 7751 } 7752 7753 // Suppress assigning zero-width bitfields. 7754 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7755 continue; 7756 7757 QualType FieldType = Field->getType().getNonReferenceType(); 7758 if (FieldType->isIncompleteArrayType()) { 7759 assert(ClassDecl->hasFlexibleArrayMember() && 7760 "Incomplete array type is not valid"); 7761 continue; 7762 } 7763 7764 // Build references to the field in the object we're copying from and to. 7765 CXXScopeSpec SS; // Intentionally empty 7766 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7767 LookupMemberName); 7768 MemberLookup.addDecl(*Field); 7769 MemberLookup.resolveKind(); 7770 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7771 Loc, /*IsArrow=*/false, 7772 SS, 0, MemberLookup, 0); 7773 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7774 Loc, /*IsArrow=*/true, 7775 SS, 0, MemberLookup, 0); 7776 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7777 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7778 7779 // If the field should be copied with __builtin_memcpy rather than via 7780 // explicit assignments, do so. This optimization only applies for arrays 7781 // of scalars and arrays of class type with trivial copy-assignment 7782 // operators. 7783 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7784 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7785 // Compute the size of the memory buffer to be copied. 7786 QualType SizeType = Context.getSizeType(); 7787 llvm::APInt Size(Context.getTypeSize(SizeType), 7788 Context.getTypeSizeInChars(BaseType).getQuantity()); 7789 for (const ConstantArrayType *Array 7790 = Context.getAsConstantArrayType(FieldType); 7791 Array; 7792 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7793 llvm::APInt ArraySize 7794 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7795 Size *= ArraySize; 7796 } 7797 7798 // Take the address of the field references for "from" and "to". 7799 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7800 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7801 7802 bool NeedsCollectableMemCpy = 7803 (BaseType->isRecordType() && 7804 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7805 7806 if (NeedsCollectableMemCpy) { 7807 if (!CollectableMemCpyRef) { 7808 // Create a reference to the __builtin_objc_memmove_collectable function. 7809 LookupResult R(*this, 7810 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7811 Loc, LookupOrdinaryName); 7812 LookupName(R, TUScope, true); 7813 7814 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7815 if (!CollectableMemCpy) { 7816 // Something went horribly wrong earlier, and we will have 7817 // complained about it. 7818 Invalid = true; 7819 continue; 7820 } 7821 7822 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7823 CollectableMemCpy->getType(), 7824 VK_LValue, Loc, 0).take(); 7825 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7826 } 7827 } 7828 // Create a reference to the __builtin_memcpy builtin function. 7829 else if (!BuiltinMemCpyRef) { 7830 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7831 LookupOrdinaryName); 7832 LookupName(R, TUScope, true); 7833 7834 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7835 if (!BuiltinMemCpy) { 7836 // Something went horribly wrong earlier, and we will have complained 7837 // about it. 7838 Invalid = true; 7839 continue; 7840 } 7841 7842 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7843 BuiltinMemCpy->getType(), 7844 VK_LValue, Loc, 0).take(); 7845 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7846 } 7847 7848 ASTOwningVector<Expr*> CallArgs(*this); 7849 CallArgs.push_back(To.takeAs<Expr>()); 7850 CallArgs.push_back(From.takeAs<Expr>()); 7851 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7852 ExprResult Call = ExprError(); 7853 if (NeedsCollectableMemCpy) 7854 Call = ActOnCallExpr(/*Scope=*/0, 7855 CollectableMemCpyRef, 7856 Loc, move_arg(CallArgs), 7857 Loc); 7858 else 7859 Call = ActOnCallExpr(/*Scope=*/0, 7860 BuiltinMemCpyRef, 7861 Loc, move_arg(CallArgs), 7862 Loc); 7863 7864 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7865 Statements.push_back(Call.takeAs<Expr>()); 7866 continue; 7867 } 7868 7869 // Build the copy of this field. 7870 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7871 To.get(), From.get(), 7872 /*CopyingBaseSubobject=*/false, 7873 /*Copying=*/true); 7874 if (Copy.isInvalid()) { 7875 Diag(CurrentLocation, diag::note_member_synthesized_at) 7876 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7877 CopyAssignOperator->setInvalidDecl(); 7878 return; 7879 } 7880 7881 // Success! Record the copy. 7882 Statements.push_back(Copy.takeAs<Stmt>()); 7883 } 7884 7885 if (!Invalid) { 7886 // Add a "return *this;" 7887 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7888 7889 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7890 if (Return.isInvalid()) 7891 Invalid = true; 7892 else { 7893 Statements.push_back(Return.takeAs<Stmt>()); 7894 7895 if (Trap.hasErrorOccurred()) { 7896 Diag(CurrentLocation, diag::note_member_synthesized_at) 7897 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7898 Invalid = true; 7899 } 7900 } 7901 } 7902 7903 if (Invalid) { 7904 CopyAssignOperator->setInvalidDecl(); 7905 return; 7906 } 7907 7908 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7909 /*isStmtExpr=*/false); 7910 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7911 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7912 7913 if (ASTMutationListener *L = getASTMutationListener()) { 7914 L->CompletedImplicitDefinition(CopyAssignOperator); 7915 } 7916} 7917 7918Sema::ImplicitExceptionSpecification 7919Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7920 ImplicitExceptionSpecification ExceptSpec(Context); 7921 7922 if (ClassDecl->isInvalidDecl()) 7923 return ExceptSpec; 7924 7925 // C++0x [except.spec]p14: 7926 // An implicitly declared special member function (Clause 12) shall have an 7927 // exception-specification. [...] 7928 7929 // It is unspecified whether or not an implicit move assignment operator 7930 // attempts to deduplicate calls to assignment operators of virtual bases are 7931 // made. As such, this exception specification is effectively unspecified. 7932 // Based on a similar decision made for constness in C++0x, we're erring on 7933 // the side of assuming such calls to be made regardless of whether they 7934 // actually happen. 7935 // Note that a move constructor is not implicitly declared when there are 7936 // virtual bases, but it can still be user-declared and explicitly defaulted. 7937 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7938 BaseEnd = ClassDecl->bases_end(); 7939 Base != BaseEnd; ++Base) { 7940 if (Base->isVirtual()) 7941 continue; 7942 7943 CXXRecordDecl *BaseClassDecl 7944 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7945 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7946 false, 0)) 7947 ExceptSpec.CalledDecl(MoveAssign); 7948 } 7949 7950 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7951 BaseEnd = ClassDecl->vbases_end(); 7952 Base != BaseEnd; ++Base) { 7953 CXXRecordDecl *BaseClassDecl 7954 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7955 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7956 false, 0)) 7957 ExceptSpec.CalledDecl(MoveAssign); 7958 } 7959 7960 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7961 FieldEnd = ClassDecl->field_end(); 7962 Field != FieldEnd; 7963 ++Field) { 7964 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7965 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7966 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7967 false, 0)) 7968 ExceptSpec.CalledDecl(MoveAssign); 7969 } 7970 } 7971 7972 return ExceptSpec; 7973} 7974 7975CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7976 // Note: The following rules are largely analoguous to the move 7977 // constructor rules. 7978 7979 ImplicitExceptionSpecification Spec( 7980 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7981 7982 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7983 QualType RetType = Context.getLValueReferenceType(ArgType); 7984 ArgType = Context.getRValueReferenceType(ArgType); 7985 7986 // An implicitly-declared move assignment operator is an inline public 7987 // member of its class. 7988 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7989 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7990 SourceLocation ClassLoc = ClassDecl->getLocation(); 7991 DeclarationNameInfo NameInfo(Name, ClassLoc); 7992 CXXMethodDecl *MoveAssignment 7993 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7994 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7995 /*TInfo=*/0, /*isStatic=*/false, 7996 /*StorageClassAsWritten=*/SC_None, 7997 /*isInline=*/true, 7998 /*isConstexpr=*/false, 7999 SourceLocation()); 8000 MoveAssignment->setAccess(AS_public); 8001 MoveAssignment->setDefaulted(); 8002 MoveAssignment->setImplicit(); 8003 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8004 8005 // Add the parameter to the operator. 8006 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8007 ClassLoc, ClassLoc, /*Id=*/0, 8008 ArgType, /*TInfo=*/0, 8009 SC_None, 8010 SC_None, 0); 8011 MoveAssignment->setParams(FromParam); 8012 8013 // Note that we have added this copy-assignment operator. 8014 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8015 8016 // C++0x [class.copy]p9: 8017 // If the definition of a class X does not explicitly declare a move 8018 // assignment operator, one will be implicitly declared as defaulted if and 8019 // only if: 8020 // [...] 8021 // - the move assignment operator would not be implicitly defined as 8022 // deleted. 8023 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8024 // Cache this result so that we don't try to generate this over and over 8025 // on every lookup, leaking memory and wasting time. 8026 ClassDecl->setFailedImplicitMoveAssignment(); 8027 return 0; 8028 } 8029 8030 if (Scope *S = getScopeForContext(ClassDecl)) 8031 PushOnScopeChains(MoveAssignment, S, false); 8032 ClassDecl->addDecl(MoveAssignment); 8033 8034 AddOverriddenMethods(ClassDecl, MoveAssignment); 8035 return MoveAssignment; 8036} 8037 8038void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8039 CXXMethodDecl *MoveAssignOperator) { 8040 assert((MoveAssignOperator->isDefaulted() && 8041 MoveAssignOperator->isOverloadedOperator() && 8042 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8043 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8044 "DefineImplicitMoveAssignment called for wrong function"); 8045 8046 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8047 8048 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8049 MoveAssignOperator->setInvalidDecl(); 8050 return; 8051 } 8052 8053 MoveAssignOperator->setUsed(); 8054 8055 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8056 DiagnosticErrorTrap Trap(Diags); 8057 8058 // C++0x [class.copy]p28: 8059 // The implicitly-defined or move assignment operator for a non-union class 8060 // X performs memberwise move assignment of its subobjects. The direct base 8061 // classes of X are assigned first, in the order of their declaration in the 8062 // base-specifier-list, and then the immediate non-static data members of X 8063 // are assigned, in the order in which they were declared in the class 8064 // definition. 8065 8066 // The statements that form the synthesized function body. 8067 ASTOwningVector<Stmt*> Statements(*this); 8068 8069 // The parameter for the "other" object, which we are move from. 8070 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8071 QualType OtherRefType = Other->getType()-> 8072 getAs<RValueReferenceType>()->getPointeeType(); 8073 assert(OtherRefType.getQualifiers() == 0 && 8074 "Bad argument type of defaulted move assignment"); 8075 8076 // Our location for everything implicitly-generated. 8077 SourceLocation Loc = MoveAssignOperator->getLocation(); 8078 8079 // Construct a reference to the "other" object. We'll be using this 8080 // throughout the generated ASTs. 8081 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8082 assert(OtherRef && "Reference to parameter cannot fail!"); 8083 // Cast to rvalue. 8084 OtherRef = CastForMoving(*this, OtherRef); 8085 8086 // Construct the "this" pointer. We'll be using this throughout the generated 8087 // ASTs. 8088 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8089 assert(This && "Reference to this cannot fail!"); 8090 8091 // Assign base classes. 8092 bool Invalid = false; 8093 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8094 E = ClassDecl->bases_end(); Base != E; ++Base) { 8095 // Form the assignment: 8096 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8097 QualType BaseType = Base->getType().getUnqualifiedType(); 8098 if (!BaseType->isRecordType()) { 8099 Invalid = true; 8100 continue; 8101 } 8102 8103 CXXCastPath BasePath; 8104 BasePath.push_back(Base); 8105 8106 // Construct the "from" expression, which is an implicit cast to the 8107 // appropriately-qualified base type. 8108 Expr *From = OtherRef; 8109 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8110 VK_XValue, &BasePath).take(); 8111 8112 // Dereference "this". 8113 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8114 8115 // Implicitly cast "this" to the appropriately-qualified base type. 8116 To = ImpCastExprToType(To.take(), 8117 Context.getCVRQualifiedType(BaseType, 8118 MoveAssignOperator->getTypeQualifiers()), 8119 CK_UncheckedDerivedToBase, 8120 VK_LValue, &BasePath); 8121 8122 // Build the move. 8123 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8124 To.get(), From, 8125 /*CopyingBaseSubobject=*/true, 8126 /*Copying=*/false); 8127 if (Move.isInvalid()) { 8128 Diag(CurrentLocation, diag::note_member_synthesized_at) 8129 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8130 MoveAssignOperator->setInvalidDecl(); 8131 return; 8132 } 8133 8134 // Success! Record the move. 8135 Statements.push_back(Move.takeAs<Expr>()); 8136 } 8137 8138 // \brief Reference to the __builtin_memcpy function. 8139 Expr *BuiltinMemCpyRef = 0; 8140 // \brief Reference to the __builtin_objc_memmove_collectable function. 8141 Expr *CollectableMemCpyRef = 0; 8142 8143 // Assign non-static members. 8144 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8145 FieldEnd = ClassDecl->field_end(); 8146 Field != FieldEnd; ++Field) { 8147 if (Field->isUnnamedBitfield()) 8148 continue; 8149 8150 // Check for members of reference type; we can't move those. 8151 if (Field->getType()->isReferenceType()) { 8152 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8153 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8154 Diag(Field->getLocation(), diag::note_declared_at); 8155 Diag(CurrentLocation, diag::note_member_synthesized_at) 8156 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8157 Invalid = true; 8158 continue; 8159 } 8160 8161 // Check for members of const-qualified, non-class type. 8162 QualType BaseType = Context.getBaseElementType(Field->getType()); 8163 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8164 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8165 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8166 Diag(Field->getLocation(), diag::note_declared_at); 8167 Diag(CurrentLocation, diag::note_member_synthesized_at) 8168 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8169 Invalid = true; 8170 continue; 8171 } 8172 8173 // Suppress assigning zero-width bitfields. 8174 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8175 continue; 8176 8177 QualType FieldType = Field->getType().getNonReferenceType(); 8178 if (FieldType->isIncompleteArrayType()) { 8179 assert(ClassDecl->hasFlexibleArrayMember() && 8180 "Incomplete array type is not valid"); 8181 continue; 8182 } 8183 8184 // Build references to the field in the object we're copying from and to. 8185 CXXScopeSpec SS; // Intentionally empty 8186 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8187 LookupMemberName); 8188 MemberLookup.addDecl(*Field); 8189 MemberLookup.resolveKind(); 8190 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8191 Loc, /*IsArrow=*/false, 8192 SS, 0, MemberLookup, 0); 8193 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8194 Loc, /*IsArrow=*/true, 8195 SS, 0, MemberLookup, 0); 8196 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8197 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8198 8199 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8200 "Member reference with rvalue base must be rvalue except for reference " 8201 "members, which aren't allowed for move assignment."); 8202 8203 // If the field should be copied with __builtin_memcpy rather than via 8204 // explicit assignments, do so. This optimization only applies for arrays 8205 // of scalars and arrays of class type with trivial move-assignment 8206 // operators. 8207 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8208 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8209 // Compute the size of the memory buffer to be copied. 8210 QualType SizeType = Context.getSizeType(); 8211 llvm::APInt Size(Context.getTypeSize(SizeType), 8212 Context.getTypeSizeInChars(BaseType).getQuantity()); 8213 for (const ConstantArrayType *Array 8214 = Context.getAsConstantArrayType(FieldType); 8215 Array; 8216 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8217 llvm::APInt ArraySize 8218 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8219 Size *= ArraySize; 8220 } 8221 8222 // Take the address of the field references for "from" and "to". We 8223 // directly construct UnaryOperators here because semantic analysis 8224 // does not permit us to take the address of an xvalue. 8225 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8226 Context.getPointerType(From.get()->getType()), 8227 VK_RValue, OK_Ordinary, Loc); 8228 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8229 Context.getPointerType(To.get()->getType()), 8230 VK_RValue, OK_Ordinary, Loc); 8231 8232 bool NeedsCollectableMemCpy = 8233 (BaseType->isRecordType() && 8234 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8235 8236 if (NeedsCollectableMemCpy) { 8237 if (!CollectableMemCpyRef) { 8238 // Create a reference to the __builtin_objc_memmove_collectable function. 8239 LookupResult R(*this, 8240 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8241 Loc, LookupOrdinaryName); 8242 LookupName(R, TUScope, true); 8243 8244 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8245 if (!CollectableMemCpy) { 8246 // Something went horribly wrong earlier, and we will have 8247 // complained about it. 8248 Invalid = true; 8249 continue; 8250 } 8251 8252 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8253 CollectableMemCpy->getType(), 8254 VK_LValue, Loc, 0).take(); 8255 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8256 } 8257 } 8258 // Create a reference to the __builtin_memcpy builtin function. 8259 else if (!BuiltinMemCpyRef) { 8260 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8261 LookupOrdinaryName); 8262 LookupName(R, TUScope, true); 8263 8264 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8265 if (!BuiltinMemCpy) { 8266 // Something went horribly wrong earlier, and we will have complained 8267 // about it. 8268 Invalid = true; 8269 continue; 8270 } 8271 8272 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8273 BuiltinMemCpy->getType(), 8274 VK_LValue, Loc, 0).take(); 8275 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8276 } 8277 8278 ASTOwningVector<Expr*> CallArgs(*this); 8279 CallArgs.push_back(To.takeAs<Expr>()); 8280 CallArgs.push_back(From.takeAs<Expr>()); 8281 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8282 ExprResult Call = ExprError(); 8283 if (NeedsCollectableMemCpy) 8284 Call = ActOnCallExpr(/*Scope=*/0, 8285 CollectableMemCpyRef, 8286 Loc, move_arg(CallArgs), 8287 Loc); 8288 else 8289 Call = ActOnCallExpr(/*Scope=*/0, 8290 BuiltinMemCpyRef, 8291 Loc, move_arg(CallArgs), 8292 Loc); 8293 8294 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8295 Statements.push_back(Call.takeAs<Expr>()); 8296 continue; 8297 } 8298 8299 // Build the move of this field. 8300 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8301 To.get(), From.get(), 8302 /*CopyingBaseSubobject=*/false, 8303 /*Copying=*/false); 8304 if (Move.isInvalid()) { 8305 Diag(CurrentLocation, diag::note_member_synthesized_at) 8306 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8307 MoveAssignOperator->setInvalidDecl(); 8308 return; 8309 } 8310 8311 // Success! Record the copy. 8312 Statements.push_back(Move.takeAs<Stmt>()); 8313 } 8314 8315 if (!Invalid) { 8316 // Add a "return *this;" 8317 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8318 8319 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8320 if (Return.isInvalid()) 8321 Invalid = true; 8322 else { 8323 Statements.push_back(Return.takeAs<Stmt>()); 8324 8325 if (Trap.hasErrorOccurred()) { 8326 Diag(CurrentLocation, diag::note_member_synthesized_at) 8327 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8328 Invalid = true; 8329 } 8330 } 8331 } 8332 8333 if (Invalid) { 8334 MoveAssignOperator->setInvalidDecl(); 8335 return; 8336 } 8337 8338 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8339 /*isStmtExpr=*/false); 8340 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8341 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8342 8343 if (ASTMutationListener *L = getASTMutationListener()) { 8344 L->CompletedImplicitDefinition(MoveAssignOperator); 8345 } 8346} 8347 8348std::pair<Sema::ImplicitExceptionSpecification, bool> 8349Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8350 if (ClassDecl->isInvalidDecl()) 8351 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8352 8353 // C++ [class.copy]p5: 8354 // The implicitly-declared copy constructor for a class X will 8355 // have the form 8356 // 8357 // X::X(const X&) 8358 // 8359 // if 8360 // FIXME: It ought to be possible to store this on the record. 8361 bool HasConstCopyConstructor = true; 8362 8363 // -- each direct or virtual base class B of X has a copy 8364 // constructor whose first parameter is of type const B& or 8365 // const volatile B&, and 8366 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8367 BaseEnd = ClassDecl->bases_end(); 8368 HasConstCopyConstructor && Base != BaseEnd; 8369 ++Base) { 8370 // Virtual bases are handled below. 8371 if (Base->isVirtual()) 8372 continue; 8373 8374 CXXRecordDecl *BaseClassDecl 8375 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8376 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8377 &HasConstCopyConstructor); 8378 } 8379 8380 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8381 BaseEnd = ClassDecl->vbases_end(); 8382 HasConstCopyConstructor && Base != BaseEnd; 8383 ++Base) { 8384 CXXRecordDecl *BaseClassDecl 8385 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8386 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8387 &HasConstCopyConstructor); 8388 } 8389 8390 // -- for all the nonstatic data members of X that are of a 8391 // class type M (or array thereof), each such class type 8392 // has a copy constructor whose first parameter is of type 8393 // const M& or const volatile M&. 8394 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8395 FieldEnd = ClassDecl->field_end(); 8396 HasConstCopyConstructor && Field != FieldEnd; 8397 ++Field) { 8398 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8399 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8400 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8401 &HasConstCopyConstructor); 8402 } 8403 } 8404 // Otherwise, the implicitly declared copy constructor will have 8405 // the form 8406 // 8407 // X::X(X&) 8408 8409 // C++ [except.spec]p14: 8410 // An implicitly declared special member function (Clause 12) shall have an 8411 // exception-specification. [...] 8412 ImplicitExceptionSpecification ExceptSpec(Context); 8413 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8414 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8415 BaseEnd = ClassDecl->bases_end(); 8416 Base != BaseEnd; 8417 ++Base) { 8418 // Virtual bases are handled below. 8419 if (Base->isVirtual()) 8420 continue; 8421 8422 CXXRecordDecl *BaseClassDecl 8423 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8424 if (CXXConstructorDecl *CopyConstructor = 8425 LookupCopyingConstructor(BaseClassDecl, Quals)) 8426 ExceptSpec.CalledDecl(CopyConstructor); 8427 } 8428 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8429 BaseEnd = ClassDecl->vbases_end(); 8430 Base != BaseEnd; 8431 ++Base) { 8432 CXXRecordDecl *BaseClassDecl 8433 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8434 if (CXXConstructorDecl *CopyConstructor = 8435 LookupCopyingConstructor(BaseClassDecl, Quals)) 8436 ExceptSpec.CalledDecl(CopyConstructor); 8437 } 8438 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8439 FieldEnd = ClassDecl->field_end(); 8440 Field != FieldEnd; 8441 ++Field) { 8442 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8443 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8444 if (CXXConstructorDecl *CopyConstructor = 8445 LookupCopyingConstructor(FieldClassDecl, Quals)) 8446 ExceptSpec.CalledDecl(CopyConstructor); 8447 } 8448 } 8449 8450 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8451} 8452 8453CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8454 CXXRecordDecl *ClassDecl) { 8455 // C++ [class.copy]p4: 8456 // If the class definition does not explicitly declare a copy 8457 // constructor, one is declared implicitly. 8458 8459 ImplicitExceptionSpecification Spec(Context); 8460 bool Const; 8461 llvm::tie(Spec, Const) = 8462 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8463 8464 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8465 QualType ArgType = ClassType; 8466 if (Const) 8467 ArgType = ArgType.withConst(); 8468 ArgType = Context.getLValueReferenceType(ArgType); 8469 8470 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8471 8472 DeclarationName Name 8473 = Context.DeclarationNames.getCXXConstructorName( 8474 Context.getCanonicalType(ClassType)); 8475 SourceLocation ClassLoc = ClassDecl->getLocation(); 8476 DeclarationNameInfo NameInfo(Name, ClassLoc); 8477 8478 // An implicitly-declared copy constructor is an inline public 8479 // member of its class. 8480 CXXConstructorDecl *CopyConstructor 8481 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8482 Context.getFunctionType(Context.VoidTy, 8483 &ArgType, 1, EPI), 8484 /*TInfo=*/0, 8485 /*isExplicit=*/false, 8486 /*isInline=*/true, 8487 /*isImplicitlyDeclared=*/true, 8488 // FIXME: apply the rules for definitions here 8489 /*isConstexpr=*/false); 8490 CopyConstructor->setAccess(AS_public); 8491 CopyConstructor->setDefaulted(); 8492 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8493 8494 // Note that we have declared this constructor. 8495 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8496 8497 // Add the parameter to the constructor. 8498 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8499 ClassLoc, ClassLoc, 8500 /*IdentifierInfo=*/0, 8501 ArgType, /*TInfo=*/0, 8502 SC_None, 8503 SC_None, 0); 8504 CopyConstructor->setParams(FromParam); 8505 8506 if (Scope *S = getScopeForContext(ClassDecl)) 8507 PushOnScopeChains(CopyConstructor, S, false); 8508 ClassDecl->addDecl(CopyConstructor); 8509 8510 // C++0x [class.copy]p7: 8511 // ... If the class definition declares a move constructor or move 8512 // assignment operator, the implicitly declared constructor is defined as 8513 // deleted; ... 8514 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8515 ClassDecl->hasUserDeclaredMoveAssignment() || 8516 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8517 CopyConstructor->setDeletedAsWritten(); 8518 8519 return CopyConstructor; 8520} 8521 8522void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8523 CXXConstructorDecl *CopyConstructor) { 8524 assert((CopyConstructor->isDefaulted() && 8525 CopyConstructor->isCopyConstructor() && 8526 !CopyConstructor->doesThisDeclarationHaveABody()) && 8527 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8528 8529 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8530 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8531 8532 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8533 DiagnosticErrorTrap Trap(Diags); 8534 8535 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8536 Trap.hasErrorOccurred()) { 8537 Diag(CurrentLocation, diag::note_member_synthesized_at) 8538 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8539 CopyConstructor->setInvalidDecl(); 8540 } else { 8541 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8542 CopyConstructor->getLocation(), 8543 MultiStmtArg(*this, 0, 0), 8544 /*isStmtExpr=*/false) 8545 .takeAs<Stmt>()); 8546 CopyConstructor->setImplicitlyDefined(true); 8547 } 8548 8549 CopyConstructor->setUsed(); 8550 if (ASTMutationListener *L = getASTMutationListener()) { 8551 L->CompletedImplicitDefinition(CopyConstructor); 8552 } 8553} 8554 8555Sema::ImplicitExceptionSpecification 8556Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8557 // C++ [except.spec]p14: 8558 // An implicitly declared special member function (Clause 12) shall have an 8559 // exception-specification. [...] 8560 ImplicitExceptionSpecification ExceptSpec(Context); 8561 if (ClassDecl->isInvalidDecl()) 8562 return ExceptSpec; 8563 8564 // Direct base-class constructors. 8565 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8566 BEnd = ClassDecl->bases_end(); 8567 B != BEnd; ++B) { 8568 if (B->isVirtual()) // Handled below. 8569 continue; 8570 8571 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8572 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8573 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8574 // If this is a deleted function, add it anyway. This might be conformant 8575 // with the standard. This might not. I'm not sure. It might not matter. 8576 if (Constructor) 8577 ExceptSpec.CalledDecl(Constructor); 8578 } 8579 } 8580 8581 // Virtual base-class constructors. 8582 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8583 BEnd = ClassDecl->vbases_end(); 8584 B != BEnd; ++B) { 8585 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8586 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8587 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8588 // If this is a deleted function, add it anyway. This might be conformant 8589 // with the standard. This might not. I'm not sure. It might not matter. 8590 if (Constructor) 8591 ExceptSpec.CalledDecl(Constructor); 8592 } 8593 } 8594 8595 // Field constructors. 8596 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8597 FEnd = ClassDecl->field_end(); 8598 F != FEnd; ++F) { 8599 if (const RecordType *RecordTy 8600 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8601 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8602 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8603 // If this is a deleted function, add it anyway. This might be conformant 8604 // with the standard. This might not. I'm not sure. It might not matter. 8605 // In particular, the problem is that this function never gets called. It 8606 // might just be ill-formed because this function attempts to refer to 8607 // a deleted function here. 8608 if (Constructor) 8609 ExceptSpec.CalledDecl(Constructor); 8610 } 8611 } 8612 8613 return ExceptSpec; 8614} 8615 8616CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8617 CXXRecordDecl *ClassDecl) { 8618 ImplicitExceptionSpecification Spec( 8619 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8620 8621 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8622 QualType ArgType = Context.getRValueReferenceType(ClassType); 8623 8624 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8625 8626 DeclarationName Name 8627 = Context.DeclarationNames.getCXXConstructorName( 8628 Context.getCanonicalType(ClassType)); 8629 SourceLocation ClassLoc = ClassDecl->getLocation(); 8630 DeclarationNameInfo NameInfo(Name, ClassLoc); 8631 8632 // C++0x [class.copy]p11: 8633 // An implicitly-declared copy/move constructor is an inline public 8634 // member of its class. 8635 CXXConstructorDecl *MoveConstructor 8636 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8637 Context.getFunctionType(Context.VoidTy, 8638 &ArgType, 1, EPI), 8639 /*TInfo=*/0, 8640 /*isExplicit=*/false, 8641 /*isInline=*/true, 8642 /*isImplicitlyDeclared=*/true, 8643 // FIXME: apply the rules for definitions here 8644 /*isConstexpr=*/false); 8645 MoveConstructor->setAccess(AS_public); 8646 MoveConstructor->setDefaulted(); 8647 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8648 8649 // Add the parameter to the constructor. 8650 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8651 ClassLoc, ClassLoc, 8652 /*IdentifierInfo=*/0, 8653 ArgType, /*TInfo=*/0, 8654 SC_None, 8655 SC_None, 0); 8656 MoveConstructor->setParams(FromParam); 8657 8658 // C++0x [class.copy]p9: 8659 // If the definition of a class X does not explicitly declare a move 8660 // constructor, one will be implicitly declared as defaulted if and only if: 8661 // [...] 8662 // - the move constructor would not be implicitly defined as deleted. 8663 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8664 // Cache this result so that we don't try to generate this over and over 8665 // on every lookup, leaking memory and wasting time. 8666 ClassDecl->setFailedImplicitMoveConstructor(); 8667 return 0; 8668 } 8669 8670 // Note that we have declared this constructor. 8671 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8672 8673 if (Scope *S = getScopeForContext(ClassDecl)) 8674 PushOnScopeChains(MoveConstructor, S, false); 8675 ClassDecl->addDecl(MoveConstructor); 8676 8677 return MoveConstructor; 8678} 8679 8680void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8681 CXXConstructorDecl *MoveConstructor) { 8682 assert((MoveConstructor->isDefaulted() && 8683 MoveConstructor->isMoveConstructor() && 8684 !MoveConstructor->doesThisDeclarationHaveABody()) && 8685 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8686 8687 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8688 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8689 8690 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8691 DiagnosticErrorTrap Trap(Diags); 8692 8693 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8694 Trap.hasErrorOccurred()) { 8695 Diag(CurrentLocation, diag::note_member_synthesized_at) 8696 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8697 MoveConstructor->setInvalidDecl(); 8698 } else { 8699 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8700 MoveConstructor->getLocation(), 8701 MultiStmtArg(*this, 0, 0), 8702 /*isStmtExpr=*/false) 8703 .takeAs<Stmt>()); 8704 MoveConstructor->setImplicitlyDefined(true); 8705 } 8706 8707 MoveConstructor->setUsed(); 8708 8709 if (ASTMutationListener *L = getASTMutationListener()) { 8710 L->CompletedImplicitDefinition(MoveConstructor); 8711 } 8712} 8713 8714ExprResult 8715Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8716 CXXConstructorDecl *Constructor, 8717 MultiExprArg ExprArgs, 8718 bool HadMultipleCandidates, 8719 bool RequiresZeroInit, 8720 unsigned ConstructKind, 8721 SourceRange ParenRange) { 8722 bool Elidable = false; 8723 8724 // C++0x [class.copy]p34: 8725 // When certain criteria are met, an implementation is allowed to 8726 // omit the copy/move construction of a class object, even if the 8727 // copy/move constructor and/or destructor for the object have 8728 // side effects. [...] 8729 // - when a temporary class object that has not been bound to a 8730 // reference (12.2) would be copied/moved to a class object 8731 // with the same cv-unqualified type, the copy/move operation 8732 // can be omitted by constructing the temporary object 8733 // directly into the target of the omitted copy/move 8734 if (ConstructKind == CXXConstructExpr::CK_Complete && 8735 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8736 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8737 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8738 } 8739 8740 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8741 Elidable, move(ExprArgs), HadMultipleCandidates, 8742 RequiresZeroInit, ConstructKind, ParenRange); 8743} 8744 8745/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8746/// including handling of its default argument expressions. 8747ExprResult 8748Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8749 CXXConstructorDecl *Constructor, bool Elidable, 8750 MultiExprArg ExprArgs, 8751 bool HadMultipleCandidates, 8752 bool RequiresZeroInit, 8753 unsigned ConstructKind, 8754 SourceRange ParenRange) { 8755 unsigned NumExprs = ExprArgs.size(); 8756 Expr **Exprs = (Expr **)ExprArgs.release(); 8757 8758 for (specific_attr_iterator<NonNullAttr> 8759 i = Constructor->specific_attr_begin<NonNullAttr>(), 8760 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8761 const NonNullAttr *NonNull = *i; 8762 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8763 } 8764 8765 MarkDeclarationReferenced(ConstructLoc, Constructor); 8766 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8767 Constructor, Elidable, Exprs, NumExprs, 8768 HadMultipleCandidates, RequiresZeroInit, 8769 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8770 ParenRange)); 8771} 8772 8773bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8774 CXXConstructorDecl *Constructor, 8775 MultiExprArg Exprs, 8776 bool HadMultipleCandidates) { 8777 // FIXME: Provide the correct paren SourceRange when available. 8778 ExprResult TempResult = 8779 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8780 move(Exprs), HadMultipleCandidates, false, 8781 CXXConstructExpr::CK_Complete, SourceRange()); 8782 if (TempResult.isInvalid()) 8783 return true; 8784 8785 Expr *Temp = TempResult.takeAs<Expr>(); 8786 CheckImplicitConversions(Temp, VD->getLocation()); 8787 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8788 Temp = MaybeCreateExprWithCleanups(Temp); 8789 VD->setInit(Temp); 8790 8791 return false; 8792} 8793 8794void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8795 if (VD->isInvalidDecl()) return; 8796 8797 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8798 if (ClassDecl->isInvalidDecl()) return; 8799 if (ClassDecl->hasTrivialDestructor()) return; 8800 if (ClassDecl->isDependentContext()) return; 8801 8802 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8803 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8804 CheckDestructorAccess(VD->getLocation(), Destructor, 8805 PDiag(diag::err_access_dtor_var) 8806 << VD->getDeclName() 8807 << VD->getType()); 8808 8809 if (!VD->hasGlobalStorage()) return; 8810 8811 // Emit warning for non-trivial dtor in global scope (a real global, 8812 // class-static, function-static). 8813 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8814 8815 // TODO: this should be re-enabled for static locals by !CXAAtExit 8816 if (!VD->isStaticLocal()) 8817 Diag(VD->getLocation(), diag::warn_global_destructor); 8818} 8819 8820/// AddCXXDirectInitializerToDecl - This action is called immediately after 8821/// ActOnDeclarator, when a C++ direct initializer is present. 8822/// e.g: "int x(1);" 8823void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8824 SourceLocation LParenLoc, 8825 MultiExprArg Exprs, 8826 SourceLocation RParenLoc, 8827 bool TypeMayContainAuto) { 8828 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8829 8830 // If there is no declaration, there was an error parsing it. Just ignore 8831 // the initializer. 8832 if (RealDecl == 0) 8833 return; 8834 8835 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8836 if (!VDecl) { 8837 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8838 RealDecl->setInvalidDecl(); 8839 return; 8840 } 8841 8842 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8843 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8844 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8845 if (Exprs.size() > 1) { 8846 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8847 diag::err_auto_var_init_multiple_expressions) 8848 << VDecl->getDeclName() << VDecl->getType() 8849 << VDecl->getSourceRange(); 8850 RealDecl->setInvalidDecl(); 8851 return; 8852 } 8853 8854 Expr *Init = Exprs.get()[0]; 8855 TypeSourceInfo *DeducedType = 0; 8856 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8857 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8858 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8859 << Init->getSourceRange(); 8860 if (!DeducedType) { 8861 RealDecl->setInvalidDecl(); 8862 return; 8863 } 8864 VDecl->setTypeSourceInfo(DeducedType); 8865 VDecl->setType(DeducedType->getType()); 8866 8867 // In ARC, infer lifetime. 8868 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8869 VDecl->setInvalidDecl(); 8870 8871 // If this is a redeclaration, check that the type we just deduced matches 8872 // the previously declared type. 8873 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8874 MergeVarDeclTypes(VDecl, Old); 8875 } 8876 8877 // We will represent direct-initialization similarly to copy-initialization: 8878 // int x(1); -as-> int x = 1; 8879 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8880 // 8881 // Clients that want to distinguish between the two forms, can check for 8882 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8883 // A major benefit is that clients that don't particularly care about which 8884 // exactly form was it (like the CodeGen) can handle both cases without 8885 // special case code. 8886 8887 // C++ 8.5p11: 8888 // The form of initialization (using parentheses or '=') is generally 8889 // insignificant, but does matter when the entity being initialized has a 8890 // class type. 8891 8892 if (!VDecl->getType()->isDependentType() && 8893 !VDecl->getType()->isIncompleteArrayType() && 8894 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8895 diag::err_typecheck_decl_incomplete_type)) { 8896 VDecl->setInvalidDecl(); 8897 return; 8898 } 8899 8900 // The variable can not have an abstract class type. 8901 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8902 diag::err_abstract_type_in_decl, 8903 AbstractVariableType)) 8904 VDecl->setInvalidDecl(); 8905 8906 const VarDecl *Def; 8907 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8908 Diag(VDecl->getLocation(), diag::err_redefinition) 8909 << VDecl->getDeclName(); 8910 Diag(Def->getLocation(), diag::note_previous_definition); 8911 VDecl->setInvalidDecl(); 8912 return; 8913 } 8914 8915 // C++ [class.static.data]p4 8916 // If a static data member is of const integral or const 8917 // enumeration type, its declaration in the class definition can 8918 // specify a constant-initializer which shall be an integral 8919 // constant expression (5.19). In that case, the member can appear 8920 // in integral constant expressions. The member shall still be 8921 // defined in a namespace scope if it is used in the program and the 8922 // namespace scope definition shall not contain an initializer. 8923 // 8924 // We already performed a redefinition check above, but for static 8925 // data members we also need to check whether there was an in-class 8926 // declaration with an initializer. 8927 const VarDecl* PrevInit = 0; 8928 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8929 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8930 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8931 return; 8932 } 8933 8934 bool IsDependent = false; 8935 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8936 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8937 VDecl->setInvalidDecl(); 8938 return; 8939 } 8940 8941 if (Exprs.get()[I]->isTypeDependent()) 8942 IsDependent = true; 8943 } 8944 8945 // If either the declaration has a dependent type or if any of the 8946 // expressions is type-dependent, we represent the initialization 8947 // via a ParenListExpr for later use during template instantiation. 8948 if (VDecl->getType()->isDependentType() || IsDependent) { 8949 // Let clients know that initialization was done with a direct initializer. 8950 VDecl->setCXXDirectInitializer(true); 8951 8952 // Store the initialization expressions as a ParenListExpr. 8953 unsigned NumExprs = Exprs.size(); 8954 VDecl->setInit(new (Context) ParenListExpr( 8955 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8956 VDecl->getType().getNonReferenceType())); 8957 return; 8958 } 8959 8960 // Capture the variable that is being initialized and the style of 8961 // initialization. 8962 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8963 8964 // FIXME: Poor source location information. 8965 InitializationKind Kind 8966 = InitializationKind::CreateDirect(VDecl->getLocation(), 8967 LParenLoc, RParenLoc); 8968 8969 QualType T = VDecl->getType(); 8970 InitializationSequence InitSeq(*this, Entity, Kind, 8971 Exprs.get(), Exprs.size()); 8972 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8973 if (Result.isInvalid()) { 8974 VDecl->setInvalidDecl(); 8975 return; 8976 } else if (T != VDecl->getType()) { 8977 VDecl->setType(T); 8978 Result.get()->setType(T); 8979 } 8980 8981 8982 Expr *Init = Result.get(); 8983 CheckImplicitConversions(Init, LParenLoc); 8984 8985 Init = MaybeCreateExprWithCleanups(Init); 8986 VDecl->setInit(Init); 8987 VDecl->setCXXDirectInitializer(true); 8988 8989 CheckCompleteVariableDeclaration(VDecl); 8990} 8991 8992/// \brief Given a constructor and the set of arguments provided for the 8993/// constructor, convert the arguments and add any required default arguments 8994/// to form a proper call to this constructor. 8995/// 8996/// \returns true if an error occurred, false otherwise. 8997bool 8998Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8999 MultiExprArg ArgsPtr, 9000 SourceLocation Loc, 9001 ASTOwningVector<Expr*> &ConvertedArgs) { 9002 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9003 unsigned NumArgs = ArgsPtr.size(); 9004 Expr **Args = (Expr **)ArgsPtr.get(); 9005 9006 const FunctionProtoType *Proto 9007 = Constructor->getType()->getAs<FunctionProtoType>(); 9008 assert(Proto && "Constructor without a prototype?"); 9009 unsigned NumArgsInProto = Proto->getNumArgs(); 9010 9011 // If too few arguments are available, we'll fill in the rest with defaults. 9012 if (NumArgs < NumArgsInProto) 9013 ConvertedArgs.reserve(NumArgsInProto); 9014 else 9015 ConvertedArgs.reserve(NumArgs); 9016 9017 VariadicCallType CallType = 9018 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9019 SmallVector<Expr *, 8> AllArgs; 9020 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9021 Proto, 0, Args, NumArgs, AllArgs, 9022 CallType); 9023 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9024 ConvertedArgs.push_back(AllArgs[i]); 9025 return Invalid; 9026} 9027 9028static inline bool 9029CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9030 const FunctionDecl *FnDecl) { 9031 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9032 if (isa<NamespaceDecl>(DC)) { 9033 return SemaRef.Diag(FnDecl->getLocation(), 9034 diag::err_operator_new_delete_declared_in_namespace) 9035 << FnDecl->getDeclName(); 9036 } 9037 9038 if (isa<TranslationUnitDecl>(DC) && 9039 FnDecl->getStorageClass() == SC_Static) { 9040 return SemaRef.Diag(FnDecl->getLocation(), 9041 diag::err_operator_new_delete_declared_static) 9042 << FnDecl->getDeclName(); 9043 } 9044 9045 return false; 9046} 9047 9048static inline bool 9049CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9050 CanQualType ExpectedResultType, 9051 CanQualType ExpectedFirstParamType, 9052 unsigned DependentParamTypeDiag, 9053 unsigned InvalidParamTypeDiag) { 9054 QualType ResultType = 9055 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9056 9057 // Check that the result type is not dependent. 9058 if (ResultType->isDependentType()) 9059 return SemaRef.Diag(FnDecl->getLocation(), 9060 diag::err_operator_new_delete_dependent_result_type) 9061 << FnDecl->getDeclName() << ExpectedResultType; 9062 9063 // Check that the result type is what we expect. 9064 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9065 return SemaRef.Diag(FnDecl->getLocation(), 9066 diag::err_operator_new_delete_invalid_result_type) 9067 << FnDecl->getDeclName() << ExpectedResultType; 9068 9069 // A function template must have at least 2 parameters. 9070 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9071 return SemaRef.Diag(FnDecl->getLocation(), 9072 diag::err_operator_new_delete_template_too_few_parameters) 9073 << FnDecl->getDeclName(); 9074 9075 // The function decl must have at least 1 parameter. 9076 if (FnDecl->getNumParams() == 0) 9077 return SemaRef.Diag(FnDecl->getLocation(), 9078 diag::err_operator_new_delete_too_few_parameters) 9079 << FnDecl->getDeclName(); 9080 9081 // Check the the first parameter type is not dependent. 9082 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9083 if (FirstParamType->isDependentType()) 9084 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9085 << FnDecl->getDeclName() << ExpectedFirstParamType; 9086 9087 // Check that the first parameter type is what we expect. 9088 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9089 ExpectedFirstParamType) 9090 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9091 << FnDecl->getDeclName() << ExpectedFirstParamType; 9092 9093 return false; 9094} 9095 9096static bool 9097CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9098 // C++ [basic.stc.dynamic.allocation]p1: 9099 // A program is ill-formed if an allocation function is declared in a 9100 // namespace scope other than global scope or declared static in global 9101 // scope. 9102 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9103 return true; 9104 9105 CanQualType SizeTy = 9106 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9107 9108 // C++ [basic.stc.dynamic.allocation]p1: 9109 // The return type shall be void*. The first parameter shall have type 9110 // std::size_t. 9111 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9112 SizeTy, 9113 diag::err_operator_new_dependent_param_type, 9114 diag::err_operator_new_param_type)) 9115 return true; 9116 9117 // C++ [basic.stc.dynamic.allocation]p1: 9118 // The first parameter shall not have an associated default argument. 9119 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9120 return SemaRef.Diag(FnDecl->getLocation(), 9121 diag::err_operator_new_default_arg) 9122 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9123 9124 return false; 9125} 9126 9127static bool 9128CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9129 // C++ [basic.stc.dynamic.deallocation]p1: 9130 // A program is ill-formed if deallocation functions are declared in a 9131 // namespace scope other than global scope or declared static in global 9132 // scope. 9133 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9134 return true; 9135 9136 // C++ [basic.stc.dynamic.deallocation]p2: 9137 // Each deallocation function shall return void and its first parameter 9138 // shall be void*. 9139 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9140 SemaRef.Context.VoidPtrTy, 9141 diag::err_operator_delete_dependent_param_type, 9142 diag::err_operator_delete_param_type)) 9143 return true; 9144 9145 return false; 9146} 9147 9148/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9149/// of this overloaded operator is well-formed. If so, returns false; 9150/// otherwise, emits appropriate diagnostics and returns true. 9151bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9152 assert(FnDecl && FnDecl->isOverloadedOperator() && 9153 "Expected an overloaded operator declaration"); 9154 9155 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9156 9157 // C++ [over.oper]p5: 9158 // The allocation and deallocation functions, operator new, 9159 // operator new[], operator delete and operator delete[], are 9160 // described completely in 3.7.3. The attributes and restrictions 9161 // found in the rest of this subclause do not apply to them unless 9162 // explicitly stated in 3.7.3. 9163 if (Op == OO_Delete || Op == OO_Array_Delete) 9164 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9165 9166 if (Op == OO_New || Op == OO_Array_New) 9167 return CheckOperatorNewDeclaration(*this, FnDecl); 9168 9169 // C++ [over.oper]p6: 9170 // An operator function shall either be a non-static member 9171 // function or be a non-member function and have at least one 9172 // parameter whose type is a class, a reference to a class, an 9173 // enumeration, or a reference to an enumeration. 9174 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9175 if (MethodDecl->isStatic()) 9176 return Diag(FnDecl->getLocation(), 9177 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9178 } else { 9179 bool ClassOrEnumParam = false; 9180 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9181 ParamEnd = FnDecl->param_end(); 9182 Param != ParamEnd; ++Param) { 9183 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9184 if (ParamType->isDependentType() || ParamType->isRecordType() || 9185 ParamType->isEnumeralType()) { 9186 ClassOrEnumParam = true; 9187 break; 9188 } 9189 } 9190 9191 if (!ClassOrEnumParam) 9192 return Diag(FnDecl->getLocation(), 9193 diag::err_operator_overload_needs_class_or_enum) 9194 << FnDecl->getDeclName(); 9195 } 9196 9197 // C++ [over.oper]p8: 9198 // An operator function cannot have default arguments (8.3.6), 9199 // except where explicitly stated below. 9200 // 9201 // Only the function-call operator allows default arguments 9202 // (C++ [over.call]p1). 9203 if (Op != OO_Call) { 9204 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9205 Param != FnDecl->param_end(); ++Param) { 9206 if ((*Param)->hasDefaultArg()) 9207 return Diag((*Param)->getLocation(), 9208 diag::err_operator_overload_default_arg) 9209 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9210 } 9211 } 9212 9213 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9214 { false, false, false } 9215#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9216 , { Unary, Binary, MemberOnly } 9217#include "clang/Basic/OperatorKinds.def" 9218 }; 9219 9220 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9221 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9222 bool MustBeMemberOperator = OperatorUses[Op][2]; 9223 9224 // C++ [over.oper]p8: 9225 // [...] Operator functions cannot have more or fewer parameters 9226 // than the number required for the corresponding operator, as 9227 // described in the rest of this subclause. 9228 unsigned NumParams = FnDecl->getNumParams() 9229 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9230 if (Op != OO_Call && 9231 ((NumParams == 1 && !CanBeUnaryOperator) || 9232 (NumParams == 2 && !CanBeBinaryOperator) || 9233 (NumParams < 1) || (NumParams > 2))) { 9234 // We have the wrong number of parameters. 9235 unsigned ErrorKind; 9236 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9237 ErrorKind = 2; // 2 -> unary or binary. 9238 } else if (CanBeUnaryOperator) { 9239 ErrorKind = 0; // 0 -> unary 9240 } else { 9241 assert(CanBeBinaryOperator && 9242 "All non-call overloaded operators are unary or binary!"); 9243 ErrorKind = 1; // 1 -> binary 9244 } 9245 9246 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9247 << FnDecl->getDeclName() << NumParams << ErrorKind; 9248 } 9249 9250 // Overloaded operators other than operator() cannot be variadic. 9251 if (Op != OO_Call && 9252 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9253 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9254 << FnDecl->getDeclName(); 9255 } 9256 9257 // Some operators must be non-static member functions. 9258 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9259 return Diag(FnDecl->getLocation(), 9260 diag::err_operator_overload_must_be_member) 9261 << FnDecl->getDeclName(); 9262 } 9263 9264 // C++ [over.inc]p1: 9265 // The user-defined function called operator++ implements the 9266 // prefix and postfix ++ operator. If this function is a member 9267 // function with no parameters, or a non-member function with one 9268 // parameter of class or enumeration type, it defines the prefix 9269 // increment operator ++ for objects of that type. If the function 9270 // is a member function with one parameter (which shall be of type 9271 // int) or a non-member function with two parameters (the second 9272 // of which shall be of type int), it defines the postfix 9273 // increment operator ++ for objects of that type. 9274 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9275 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9276 bool ParamIsInt = false; 9277 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9278 ParamIsInt = BT->getKind() == BuiltinType::Int; 9279 9280 if (!ParamIsInt) 9281 return Diag(LastParam->getLocation(), 9282 diag::err_operator_overload_post_incdec_must_be_int) 9283 << LastParam->getType() << (Op == OO_MinusMinus); 9284 } 9285 9286 return false; 9287} 9288 9289/// CheckLiteralOperatorDeclaration - Check whether the declaration 9290/// of this literal operator function is well-formed. If so, returns 9291/// false; otherwise, emits appropriate diagnostics and returns true. 9292bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9293 DeclContext *DC = FnDecl->getDeclContext(); 9294 Decl::Kind Kind = DC->getDeclKind(); 9295 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9296 Kind != Decl::LinkageSpec) { 9297 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9298 << FnDecl->getDeclName(); 9299 return true; 9300 } 9301 9302 bool Valid = false; 9303 9304 // template <char...> type operator "" name() is the only valid template 9305 // signature, and the only valid signature with no parameters. 9306 if (FnDecl->param_size() == 0) { 9307 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9308 // Must have only one template parameter 9309 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9310 if (Params->size() == 1) { 9311 NonTypeTemplateParmDecl *PmDecl = 9312 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9313 9314 // The template parameter must be a char parameter pack. 9315 if (PmDecl && PmDecl->isTemplateParameterPack() && 9316 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9317 Valid = true; 9318 } 9319 } 9320 } else { 9321 // Check the first parameter 9322 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9323 9324 QualType T = (*Param)->getType(); 9325 9326 // unsigned long long int, long double, and any character type are allowed 9327 // as the only parameters. 9328 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9329 Context.hasSameType(T, Context.LongDoubleTy) || 9330 Context.hasSameType(T, Context.CharTy) || 9331 Context.hasSameType(T, Context.WCharTy) || 9332 Context.hasSameType(T, Context.Char16Ty) || 9333 Context.hasSameType(T, Context.Char32Ty)) { 9334 if (++Param == FnDecl->param_end()) 9335 Valid = true; 9336 goto FinishedParams; 9337 } 9338 9339 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9340 const PointerType *PT = T->getAs<PointerType>(); 9341 if (!PT) 9342 goto FinishedParams; 9343 T = PT->getPointeeType(); 9344 if (!T.isConstQualified()) 9345 goto FinishedParams; 9346 T = T.getUnqualifiedType(); 9347 9348 // Move on to the second parameter; 9349 ++Param; 9350 9351 // If there is no second parameter, the first must be a const char * 9352 if (Param == FnDecl->param_end()) { 9353 if (Context.hasSameType(T, Context.CharTy)) 9354 Valid = true; 9355 goto FinishedParams; 9356 } 9357 9358 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9359 // are allowed as the first parameter to a two-parameter function 9360 if (!(Context.hasSameType(T, Context.CharTy) || 9361 Context.hasSameType(T, Context.WCharTy) || 9362 Context.hasSameType(T, Context.Char16Ty) || 9363 Context.hasSameType(T, Context.Char32Ty))) 9364 goto FinishedParams; 9365 9366 // The second and final parameter must be an std::size_t 9367 T = (*Param)->getType().getUnqualifiedType(); 9368 if (Context.hasSameType(T, Context.getSizeType()) && 9369 ++Param == FnDecl->param_end()) 9370 Valid = true; 9371 } 9372 9373 // FIXME: This diagnostic is absolutely terrible. 9374FinishedParams: 9375 if (!Valid) { 9376 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9377 << FnDecl->getDeclName(); 9378 return true; 9379 } 9380 9381 StringRef LiteralName 9382 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9383 if (LiteralName[0] != '_') { 9384 // C++0x [usrlit.suffix]p1: 9385 // Literal suffix identifiers that do not start with an underscore are 9386 // reserved for future standardization. 9387 bool IsHexFloat = true; 9388 if (LiteralName.size() > 1 && 9389 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9390 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9391 if (!isdigit(LiteralName[I])) { 9392 IsHexFloat = false; 9393 break; 9394 } 9395 } 9396 } 9397 9398 if (IsHexFloat) 9399 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9400 << LiteralName; 9401 else 9402 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9403 } 9404 9405 return false; 9406} 9407 9408/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9409/// linkage specification, including the language and (if present) 9410/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9411/// the location of the language string literal, which is provided 9412/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9413/// the '{' brace. Otherwise, this linkage specification does not 9414/// have any braces. 9415Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9416 SourceLocation LangLoc, 9417 StringRef Lang, 9418 SourceLocation LBraceLoc) { 9419 LinkageSpecDecl::LanguageIDs Language; 9420 if (Lang == "\"C\"") 9421 Language = LinkageSpecDecl::lang_c; 9422 else if (Lang == "\"C++\"") 9423 Language = LinkageSpecDecl::lang_cxx; 9424 else { 9425 Diag(LangLoc, diag::err_bad_language); 9426 return 0; 9427 } 9428 9429 // FIXME: Add all the various semantics of linkage specifications 9430 9431 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9432 ExternLoc, LangLoc, Language); 9433 CurContext->addDecl(D); 9434 PushDeclContext(S, D); 9435 return D; 9436} 9437 9438/// ActOnFinishLinkageSpecification - Complete the definition of 9439/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9440/// valid, it's the position of the closing '}' brace in a linkage 9441/// specification that uses braces. 9442Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9443 Decl *LinkageSpec, 9444 SourceLocation RBraceLoc) { 9445 if (LinkageSpec) { 9446 if (RBraceLoc.isValid()) { 9447 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9448 LSDecl->setRBraceLoc(RBraceLoc); 9449 } 9450 PopDeclContext(); 9451 } 9452 return LinkageSpec; 9453} 9454 9455/// \brief Perform semantic analysis for the variable declaration that 9456/// occurs within a C++ catch clause, returning the newly-created 9457/// variable. 9458VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9459 TypeSourceInfo *TInfo, 9460 SourceLocation StartLoc, 9461 SourceLocation Loc, 9462 IdentifierInfo *Name) { 9463 bool Invalid = false; 9464 QualType ExDeclType = TInfo->getType(); 9465 9466 // Arrays and functions decay. 9467 if (ExDeclType->isArrayType()) 9468 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9469 else if (ExDeclType->isFunctionType()) 9470 ExDeclType = Context.getPointerType(ExDeclType); 9471 9472 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9473 // The exception-declaration shall not denote a pointer or reference to an 9474 // incomplete type, other than [cv] void*. 9475 // N2844 forbids rvalue references. 9476 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9477 Diag(Loc, diag::err_catch_rvalue_ref); 9478 Invalid = true; 9479 } 9480 9481 // GCC allows catching pointers and references to incomplete types 9482 // as an extension; so do we, but we warn by default. 9483 9484 QualType BaseType = ExDeclType; 9485 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9486 unsigned DK = diag::err_catch_incomplete; 9487 bool IncompleteCatchIsInvalid = true; 9488 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9489 BaseType = Ptr->getPointeeType(); 9490 Mode = 1; 9491 DK = diag::ext_catch_incomplete_ptr; 9492 IncompleteCatchIsInvalid = false; 9493 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9494 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9495 BaseType = Ref->getPointeeType(); 9496 Mode = 2; 9497 DK = diag::ext_catch_incomplete_ref; 9498 IncompleteCatchIsInvalid = false; 9499 } 9500 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9501 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9502 IncompleteCatchIsInvalid) 9503 Invalid = true; 9504 9505 if (!Invalid && !ExDeclType->isDependentType() && 9506 RequireNonAbstractType(Loc, ExDeclType, 9507 diag::err_abstract_type_in_decl, 9508 AbstractVariableType)) 9509 Invalid = true; 9510 9511 // Only the non-fragile NeXT runtime currently supports C++ catches 9512 // of ObjC types, and no runtime supports catching ObjC types by value. 9513 if (!Invalid && getLangOptions().ObjC1) { 9514 QualType T = ExDeclType; 9515 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9516 T = RT->getPointeeType(); 9517 9518 if (T->isObjCObjectType()) { 9519 Diag(Loc, diag::err_objc_object_catch); 9520 Invalid = true; 9521 } else if (T->isObjCObjectPointerType()) { 9522 if (!getLangOptions().ObjCNonFragileABI) 9523 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9524 } 9525 } 9526 9527 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9528 ExDeclType, TInfo, SC_None, SC_None); 9529 ExDecl->setExceptionVariable(true); 9530 9531 // In ARC, infer 'retaining' for variables of retainable type. 9532 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9533 Invalid = true; 9534 9535 if (!Invalid && !ExDeclType->isDependentType()) { 9536 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9537 // C++ [except.handle]p16: 9538 // The object declared in an exception-declaration or, if the 9539 // exception-declaration does not specify a name, a temporary (12.2) is 9540 // copy-initialized (8.5) from the exception object. [...] 9541 // The object is destroyed when the handler exits, after the destruction 9542 // of any automatic objects initialized within the handler. 9543 // 9544 // We just pretend to initialize the object with itself, then make sure 9545 // it can be destroyed later. 9546 QualType initType = ExDeclType; 9547 9548 InitializedEntity entity = 9549 InitializedEntity::InitializeVariable(ExDecl); 9550 InitializationKind initKind = 9551 InitializationKind::CreateCopy(Loc, SourceLocation()); 9552 9553 Expr *opaqueValue = 9554 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9555 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9556 ExprResult result = sequence.Perform(*this, entity, initKind, 9557 MultiExprArg(&opaqueValue, 1)); 9558 if (result.isInvalid()) 9559 Invalid = true; 9560 else { 9561 // If the constructor used was non-trivial, set this as the 9562 // "initializer". 9563 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9564 if (!construct->getConstructor()->isTrivial()) { 9565 Expr *init = MaybeCreateExprWithCleanups(construct); 9566 ExDecl->setInit(init); 9567 } 9568 9569 // And make sure it's destructable. 9570 FinalizeVarWithDestructor(ExDecl, recordType); 9571 } 9572 } 9573 } 9574 9575 if (Invalid) 9576 ExDecl->setInvalidDecl(); 9577 9578 return ExDecl; 9579} 9580 9581/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9582/// handler. 9583Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9584 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9585 bool Invalid = D.isInvalidType(); 9586 9587 // Check for unexpanded parameter packs. 9588 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9589 UPPC_ExceptionType)) { 9590 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9591 D.getIdentifierLoc()); 9592 Invalid = true; 9593 } 9594 9595 IdentifierInfo *II = D.getIdentifier(); 9596 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9597 LookupOrdinaryName, 9598 ForRedeclaration)) { 9599 // The scope should be freshly made just for us. There is just no way 9600 // it contains any previous declaration. 9601 assert(!S->isDeclScope(PrevDecl)); 9602 if (PrevDecl->isTemplateParameter()) { 9603 // Maybe we will complain about the shadowed template parameter. 9604 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9605 PrevDecl = 0; 9606 } 9607 } 9608 9609 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9610 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9611 << D.getCXXScopeSpec().getRange(); 9612 Invalid = true; 9613 } 9614 9615 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9616 D.getSourceRange().getBegin(), 9617 D.getIdentifierLoc(), 9618 D.getIdentifier()); 9619 if (Invalid) 9620 ExDecl->setInvalidDecl(); 9621 9622 // Add the exception declaration into this scope. 9623 if (II) 9624 PushOnScopeChains(ExDecl, S); 9625 else 9626 CurContext->addDecl(ExDecl); 9627 9628 ProcessDeclAttributes(S, ExDecl, D); 9629 return ExDecl; 9630} 9631 9632Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9633 Expr *AssertExpr, 9634 Expr *AssertMessageExpr_, 9635 SourceLocation RParenLoc) { 9636 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9637 9638 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9639 llvm::APSInt Value(32); 9640 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9641 Diag(StaticAssertLoc, 9642 diag::err_static_assert_expression_is_not_constant) << 9643 AssertExpr->getSourceRange(); 9644 return 0; 9645 } 9646 9647 if (Value == 0) { 9648 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9649 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9650 } 9651 } 9652 9653 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9654 return 0; 9655 9656 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9657 AssertExpr, AssertMessage, RParenLoc); 9658 9659 CurContext->addDecl(Decl); 9660 return Decl; 9661} 9662 9663/// \brief Perform semantic analysis of the given friend type declaration. 9664/// 9665/// \returns A friend declaration that. 9666FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9667 SourceLocation FriendLoc, 9668 TypeSourceInfo *TSInfo) { 9669 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9670 9671 QualType T = TSInfo->getType(); 9672 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9673 9674 // C++03 [class.friend]p2: 9675 // An elaborated-type-specifier shall be used in a friend declaration 9676 // for a class.* 9677 // 9678 // * The class-key of the elaborated-type-specifier is required. 9679 if (!ActiveTemplateInstantiations.empty()) { 9680 // Do not complain about the form of friend template types during 9681 // template instantiation; we will already have complained when the 9682 // template was declared. 9683 } else if (!T->isElaboratedTypeSpecifier()) { 9684 // If we evaluated the type to a record type, suggest putting 9685 // a tag in front. 9686 if (const RecordType *RT = T->getAs<RecordType>()) { 9687 RecordDecl *RD = RT->getDecl(); 9688 9689 std::string InsertionText = std::string(" ") + RD->getKindName(); 9690 9691 Diag(TypeRange.getBegin(), 9692 getLangOptions().CPlusPlus0x ? 9693 diag::warn_cxx98_compat_unelaborated_friend_type : 9694 diag::ext_unelaborated_friend_type) 9695 << (unsigned) RD->getTagKind() 9696 << T 9697 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9698 InsertionText); 9699 } else { 9700 Diag(FriendLoc, 9701 getLangOptions().CPlusPlus0x ? 9702 diag::warn_cxx98_compat_nonclass_type_friend : 9703 diag::ext_nonclass_type_friend) 9704 << T 9705 << SourceRange(FriendLoc, TypeRange.getEnd()); 9706 } 9707 } else if (T->getAs<EnumType>()) { 9708 Diag(FriendLoc, 9709 getLangOptions().CPlusPlus0x ? 9710 diag::warn_cxx98_compat_enum_friend : 9711 diag::ext_enum_friend) 9712 << T 9713 << SourceRange(FriendLoc, TypeRange.getEnd()); 9714 } 9715 9716 // C++0x [class.friend]p3: 9717 // If the type specifier in a friend declaration designates a (possibly 9718 // cv-qualified) class type, that class is declared as a friend; otherwise, 9719 // the friend declaration is ignored. 9720 9721 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9722 // in [class.friend]p3 that we do not implement. 9723 9724 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9725} 9726 9727/// Handle a friend tag declaration where the scope specifier was 9728/// templated. 9729Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9730 unsigned TagSpec, SourceLocation TagLoc, 9731 CXXScopeSpec &SS, 9732 IdentifierInfo *Name, SourceLocation NameLoc, 9733 AttributeList *Attr, 9734 MultiTemplateParamsArg TempParamLists) { 9735 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9736 9737 bool isExplicitSpecialization = false; 9738 bool Invalid = false; 9739 9740 if (TemplateParameterList *TemplateParams 9741 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9742 TempParamLists.get(), 9743 TempParamLists.size(), 9744 /*friend*/ true, 9745 isExplicitSpecialization, 9746 Invalid)) { 9747 if (TemplateParams->size() > 0) { 9748 // This is a declaration of a class template. 9749 if (Invalid) 9750 return 0; 9751 9752 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9753 SS, Name, NameLoc, Attr, 9754 TemplateParams, AS_public, 9755 /*ModulePrivateLoc=*/SourceLocation(), 9756 TempParamLists.size() - 1, 9757 (TemplateParameterList**) TempParamLists.release()).take(); 9758 } else { 9759 // The "template<>" header is extraneous. 9760 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9761 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9762 isExplicitSpecialization = true; 9763 } 9764 } 9765 9766 if (Invalid) return 0; 9767 9768 bool isAllExplicitSpecializations = true; 9769 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9770 if (TempParamLists.get()[I]->size()) { 9771 isAllExplicitSpecializations = false; 9772 break; 9773 } 9774 } 9775 9776 // FIXME: don't ignore attributes. 9777 9778 // If it's explicit specializations all the way down, just forget 9779 // about the template header and build an appropriate non-templated 9780 // friend. TODO: for source fidelity, remember the headers. 9781 if (isAllExplicitSpecializations) { 9782 if (SS.isEmpty()) { 9783 bool Owned = false; 9784 bool IsDependent = false; 9785 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9786 Attr, AS_public, 9787 /*ModulePrivateLoc=*/SourceLocation(), 9788 MultiTemplateParamsArg(), Owned, IsDependent, 9789 /*ScopedEnum=*/false, 9790 /*ScopedEnumUsesClassTag=*/false, 9791 /*UnderlyingType=*/TypeResult()); 9792 } 9793 9794 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9795 ElaboratedTypeKeyword Keyword 9796 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9797 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9798 *Name, NameLoc); 9799 if (T.isNull()) 9800 return 0; 9801 9802 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9803 if (isa<DependentNameType>(T)) { 9804 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9805 TL.setKeywordLoc(TagLoc); 9806 TL.setQualifierLoc(QualifierLoc); 9807 TL.setNameLoc(NameLoc); 9808 } else { 9809 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9810 TL.setKeywordLoc(TagLoc); 9811 TL.setQualifierLoc(QualifierLoc); 9812 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9813 } 9814 9815 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9816 TSI, FriendLoc); 9817 Friend->setAccess(AS_public); 9818 CurContext->addDecl(Friend); 9819 return Friend; 9820 } 9821 9822 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9823 9824 9825 9826 // Handle the case of a templated-scope friend class. e.g. 9827 // template <class T> class A<T>::B; 9828 // FIXME: we don't support these right now. 9829 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9830 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9831 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9832 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9833 TL.setKeywordLoc(TagLoc); 9834 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9835 TL.setNameLoc(NameLoc); 9836 9837 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9838 TSI, FriendLoc); 9839 Friend->setAccess(AS_public); 9840 Friend->setUnsupportedFriend(true); 9841 CurContext->addDecl(Friend); 9842 return Friend; 9843} 9844 9845 9846/// Handle a friend type declaration. This works in tandem with 9847/// ActOnTag. 9848/// 9849/// Notes on friend class templates: 9850/// 9851/// We generally treat friend class declarations as if they were 9852/// declaring a class. So, for example, the elaborated type specifier 9853/// in a friend declaration is required to obey the restrictions of a 9854/// class-head (i.e. no typedefs in the scope chain), template 9855/// parameters are required to match up with simple template-ids, &c. 9856/// However, unlike when declaring a template specialization, it's 9857/// okay to refer to a template specialization without an empty 9858/// template parameter declaration, e.g. 9859/// friend class A<T>::B<unsigned>; 9860/// We permit this as a special case; if there are any template 9861/// parameters present at all, require proper matching, i.e. 9862/// template <> template <class T> friend class A<int>::B; 9863Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9864 MultiTemplateParamsArg TempParams) { 9865 SourceLocation Loc = DS.getSourceRange().getBegin(); 9866 9867 assert(DS.isFriendSpecified()); 9868 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9869 9870 // Try to convert the decl specifier to a type. This works for 9871 // friend templates because ActOnTag never produces a ClassTemplateDecl 9872 // for a TUK_Friend. 9873 Declarator TheDeclarator(DS, Declarator::MemberContext); 9874 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9875 QualType T = TSI->getType(); 9876 if (TheDeclarator.isInvalidType()) 9877 return 0; 9878 9879 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9880 return 0; 9881 9882 // This is definitely an error in C++98. It's probably meant to 9883 // be forbidden in C++0x, too, but the specification is just 9884 // poorly written. 9885 // 9886 // The problem is with declarations like the following: 9887 // template <T> friend A<T>::foo; 9888 // where deciding whether a class C is a friend or not now hinges 9889 // on whether there exists an instantiation of A that causes 9890 // 'foo' to equal C. There are restrictions on class-heads 9891 // (which we declare (by fiat) elaborated friend declarations to 9892 // be) that makes this tractable. 9893 // 9894 // FIXME: handle "template <> friend class A<T>;", which 9895 // is possibly well-formed? Who even knows? 9896 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9897 Diag(Loc, diag::err_tagless_friend_type_template) 9898 << DS.getSourceRange(); 9899 return 0; 9900 } 9901 9902 // C++98 [class.friend]p1: A friend of a class is a function 9903 // or class that is not a member of the class . . . 9904 // This is fixed in DR77, which just barely didn't make the C++03 9905 // deadline. It's also a very silly restriction that seriously 9906 // affects inner classes and which nobody else seems to implement; 9907 // thus we never diagnose it, not even in -pedantic. 9908 // 9909 // But note that we could warn about it: it's always useless to 9910 // friend one of your own members (it's not, however, worthless to 9911 // friend a member of an arbitrary specialization of your template). 9912 9913 Decl *D; 9914 if (unsigned NumTempParamLists = TempParams.size()) 9915 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9916 NumTempParamLists, 9917 TempParams.release(), 9918 TSI, 9919 DS.getFriendSpecLoc()); 9920 else 9921 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9922 9923 if (!D) 9924 return 0; 9925 9926 D->setAccess(AS_public); 9927 CurContext->addDecl(D); 9928 9929 return D; 9930} 9931 9932Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9933 MultiTemplateParamsArg TemplateParams) { 9934 const DeclSpec &DS = D.getDeclSpec(); 9935 9936 assert(DS.isFriendSpecified()); 9937 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9938 9939 SourceLocation Loc = D.getIdentifierLoc(); 9940 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9941 9942 // C++ [class.friend]p1 9943 // A friend of a class is a function or class.... 9944 // Note that this sees through typedefs, which is intended. 9945 // It *doesn't* see through dependent types, which is correct 9946 // according to [temp.arg.type]p3: 9947 // If a declaration acquires a function type through a 9948 // type dependent on a template-parameter and this causes 9949 // a declaration that does not use the syntactic form of a 9950 // function declarator to have a function type, the program 9951 // is ill-formed. 9952 if (!TInfo->getType()->isFunctionType()) { 9953 Diag(Loc, diag::err_unexpected_friend); 9954 9955 // It might be worthwhile to try to recover by creating an 9956 // appropriate declaration. 9957 return 0; 9958 } 9959 9960 // C++ [namespace.memdef]p3 9961 // - If a friend declaration in a non-local class first declares a 9962 // class or function, the friend class or function is a member 9963 // of the innermost enclosing namespace. 9964 // - The name of the friend is not found by simple name lookup 9965 // until a matching declaration is provided in that namespace 9966 // scope (either before or after the class declaration granting 9967 // friendship). 9968 // - If a friend function is called, its name may be found by the 9969 // name lookup that considers functions from namespaces and 9970 // classes associated with the types of the function arguments. 9971 // - When looking for a prior declaration of a class or a function 9972 // declared as a friend, scopes outside the innermost enclosing 9973 // namespace scope are not considered. 9974 9975 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9976 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9977 DeclarationName Name = NameInfo.getName(); 9978 assert(Name); 9979 9980 // Check for unexpanded parameter packs. 9981 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9982 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9983 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9984 return 0; 9985 9986 // The context we found the declaration in, or in which we should 9987 // create the declaration. 9988 DeclContext *DC; 9989 Scope *DCScope = S; 9990 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9991 ForRedeclaration); 9992 9993 // FIXME: there are different rules in local classes 9994 9995 // There are four cases here. 9996 // - There's no scope specifier, in which case we just go to the 9997 // appropriate scope and look for a function or function template 9998 // there as appropriate. 9999 // Recover from invalid scope qualifiers as if they just weren't there. 10000 if (SS.isInvalid() || !SS.isSet()) { 10001 // C++0x [namespace.memdef]p3: 10002 // If the name in a friend declaration is neither qualified nor 10003 // a template-id and the declaration is a function or an 10004 // elaborated-type-specifier, the lookup to determine whether 10005 // the entity has been previously declared shall not consider 10006 // any scopes outside the innermost enclosing namespace. 10007 // C++0x [class.friend]p11: 10008 // If a friend declaration appears in a local class and the name 10009 // specified is an unqualified name, a prior declaration is 10010 // looked up without considering scopes that are outside the 10011 // innermost enclosing non-class scope. For a friend function 10012 // declaration, if there is no prior declaration, the program is 10013 // ill-formed. 10014 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10015 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10016 10017 // Find the appropriate context according to the above. 10018 DC = CurContext; 10019 while (true) { 10020 // Skip class contexts. If someone can cite chapter and verse 10021 // for this behavior, that would be nice --- it's what GCC and 10022 // EDG do, and it seems like a reasonable intent, but the spec 10023 // really only says that checks for unqualified existing 10024 // declarations should stop at the nearest enclosing namespace, 10025 // not that they should only consider the nearest enclosing 10026 // namespace. 10027 while (DC->isRecord()) 10028 DC = DC->getParent(); 10029 10030 LookupQualifiedName(Previous, DC); 10031 10032 // TODO: decide what we think about using declarations. 10033 if (isLocal || !Previous.empty()) 10034 break; 10035 10036 if (isTemplateId) { 10037 if (isa<TranslationUnitDecl>(DC)) break; 10038 } else { 10039 if (DC->isFileContext()) break; 10040 } 10041 DC = DC->getParent(); 10042 } 10043 10044 // C++ [class.friend]p1: A friend of a class is a function or 10045 // class that is not a member of the class . . . 10046 // C++11 changes this for both friend types and functions. 10047 // Most C++ 98 compilers do seem to give an error here, so 10048 // we do, too. 10049 if (!Previous.empty() && DC->Equals(CurContext)) 10050 Diag(DS.getFriendSpecLoc(), 10051 getLangOptions().CPlusPlus0x ? 10052 diag::warn_cxx98_compat_friend_is_member : 10053 diag::err_friend_is_member); 10054 10055 DCScope = getScopeForDeclContext(S, DC); 10056 10057 // C++ [class.friend]p6: 10058 // A function can be defined in a friend declaration of a class if and 10059 // only if the class is a non-local class (9.8), the function name is 10060 // unqualified, and the function has namespace scope. 10061 if (isLocal && D.isFunctionDefinition()) { 10062 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10063 } 10064 10065 // - There's a non-dependent scope specifier, in which case we 10066 // compute it and do a previous lookup there for a function 10067 // or function template. 10068 } else if (!SS.getScopeRep()->isDependent()) { 10069 DC = computeDeclContext(SS); 10070 if (!DC) return 0; 10071 10072 if (RequireCompleteDeclContext(SS, DC)) return 0; 10073 10074 LookupQualifiedName(Previous, DC); 10075 10076 // Ignore things found implicitly in the wrong scope. 10077 // TODO: better diagnostics for this case. Suggesting the right 10078 // qualified scope would be nice... 10079 LookupResult::Filter F = Previous.makeFilter(); 10080 while (F.hasNext()) { 10081 NamedDecl *D = F.next(); 10082 if (!DC->InEnclosingNamespaceSetOf( 10083 D->getDeclContext()->getRedeclContext())) 10084 F.erase(); 10085 } 10086 F.done(); 10087 10088 if (Previous.empty()) { 10089 D.setInvalidType(); 10090 Diag(Loc, diag::err_qualified_friend_not_found) 10091 << Name << TInfo->getType(); 10092 return 0; 10093 } 10094 10095 // C++ [class.friend]p1: A friend of a class is a function or 10096 // class that is not a member of the class . . . 10097 if (DC->Equals(CurContext)) 10098 Diag(DS.getFriendSpecLoc(), 10099 getLangOptions().CPlusPlus0x ? 10100 diag::warn_cxx98_compat_friend_is_member : 10101 diag::err_friend_is_member); 10102 10103 if (D.isFunctionDefinition()) { 10104 // C++ [class.friend]p6: 10105 // A function can be defined in a friend declaration of a class if and 10106 // only if the class is a non-local class (9.8), the function name is 10107 // unqualified, and the function has namespace scope. 10108 SemaDiagnosticBuilder DB 10109 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10110 10111 DB << SS.getScopeRep(); 10112 if (DC->isFileContext()) 10113 DB << FixItHint::CreateRemoval(SS.getRange()); 10114 SS.clear(); 10115 } 10116 10117 // - There's a scope specifier that does not match any template 10118 // parameter lists, in which case we use some arbitrary context, 10119 // create a method or method template, and wait for instantiation. 10120 // - There's a scope specifier that does match some template 10121 // parameter lists, which we don't handle right now. 10122 } else { 10123 if (D.isFunctionDefinition()) { 10124 // C++ [class.friend]p6: 10125 // A function can be defined in a friend declaration of a class if and 10126 // only if the class is a non-local class (9.8), the function name is 10127 // unqualified, and the function has namespace scope. 10128 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10129 << SS.getScopeRep(); 10130 } 10131 10132 DC = CurContext; 10133 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10134 } 10135 10136 if (!DC->isRecord()) { 10137 // This implies that it has to be an operator or function. 10138 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10139 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10140 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10141 Diag(Loc, diag::err_introducing_special_friend) << 10142 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10143 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10144 return 0; 10145 } 10146 } 10147 10148 // FIXME: This is an egregious hack to cope with cases where the scope stack 10149 // does not contain the declaration context, i.e., in an out-of-line 10150 // definition of a class. 10151 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10152 if (!DCScope) { 10153 FakeDCScope.setEntity(DC); 10154 DCScope = &FakeDCScope; 10155 } 10156 10157 bool AddToScope = true; 10158 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10159 move(TemplateParams), AddToScope); 10160 if (!ND) return 0; 10161 10162 assert(ND->getDeclContext() == DC); 10163 assert(ND->getLexicalDeclContext() == CurContext); 10164 10165 // Add the function declaration to the appropriate lookup tables, 10166 // adjusting the redeclarations list as necessary. We don't 10167 // want to do this yet if the friending class is dependent. 10168 // 10169 // Also update the scope-based lookup if the target context's 10170 // lookup context is in lexical scope. 10171 if (!CurContext->isDependentContext()) { 10172 DC = DC->getRedeclContext(); 10173 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10174 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10175 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10176 } 10177 10178 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10179 D.getIdentifierLoc(), ND, 10180 DS.getFriendSpecLoc()); 10181 FrD->setAccess(AS_public); 10182 CurContext->addDecl(FrD); 10183 10184 if (ND->isInvalidDecl()) 10185 FrD->setInvalidDecl(); 10186 else { 10187 FunctionDecl *FD; 10188 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10189 FD = FTD->getTemplatedDecl(); 10190 else 10191 FD = cast<FunctionDecl>(ND); 10192 10193 // Mark templated-scope function declarations as unsupported. 10194 if (FD->getNumTemplateParameterLists()) 10195 FrD->setUnsupportedFriend(true); 10196 } 10197 10198 return ND; 10199} 10200 10201void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10202 AdjustDeclIfTemplate(Dcl); 10203 10204 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10205 if (!Fn) { 10206 Diag(DelLoc, diag::err_deleted_non_function); 10207 return; 10208 } 10209 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10210 Diag(DelLoc, diag::err_deleted_decl_not_first); 10211 Diag(Prev->getLocation(), diag::note_previous_declaration); 10212 // If the declaration wasn't the first, we delete the function anyway for 10213 // recovery. 10214 } 10215 Fn->setDeletedAsWritten(); 10216} 10217 10218void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10219 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10220 10221 if (MD) { 10222 if (MD->getParent()->isDependentType()) { 10223 MD->setDefaulted(); 10224 MD->setExplicitlyDefaulted(); 10225 return; 10226 } 10227 10228 CXXSpecialMember Member = getSpecialMember(MD); 10229 if (Member == CXXInvalid) { 10230 Diag(DefaultLoc, diag::err_default_special_members); 10231 return; 10232 } 10233 10234 MD->setDefaulted(); 10235 MD->setExplicitlyDefaulted(); 10236 10237 // If this definition appears within the record, do the checking when 10238 // the record is complete. 10239 const FunctionDecl *Primary = MD; 10240 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10241 // Find the uninstantiated declaration that actually had the '= default' 10242 // on it. 10243 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10244 10245 if (Primary == Primary->getCanonicalDecl()) 10246 return; 10247 10248 switch (Member) { 10249 case CXXDefaultConstructor: { 10250 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10251 CheckExplicitlyDefaultedDefaultConstructor(CD); 10252 if (!CD->isInvalidDecl()) 10253 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10254 break; 10255 } 10256 10257 case CXXCopyConstructor: { 10258 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10259 CheckExplicitlyDefaultedCopyConstructor(CD); 10260 if (!CD->isInvalidDecl()) 10261 DefineImplicitCopyConstructor(DefaultLoc, CD); 10262 break; 10263 } 10264 10265 case CXXCopyAssignment: { 10266 CheckExplicitlyDefaultedCopyAssignment(MD); 10267 if (!MD->isInvalidDecl()) 10268 DefineImplicitCopyAssignment(DefaultLoc, MD); 10269 break; 10270 } 10271 10272 case CXXDestructor: { 10273 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10274 CheckExplicitlyDefaultedDestructor(DD); 10275 if (!DD->isInvalidDecl()) 10276 DefineImplicitDestructor(DefaultLoc, DD); 10277 break; 10278 } 10279 10280 case CXXMoveConstructor: { 10281 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10282 CheckExplicitlyDefaultedMoveConstructor(CD); 10283 if (!CD->isInvalidDecl()) 10284 DefineImplicitMoveConstructor(DefaultLoc, CD); 10285 break; 10286 } 10287 10288 case CXXMoveAssignment: { 10289 CheckExplicitlyDefaultedMoveAssignment(MD); 10290 if (!MD->isInvalidDecl()) 10291 DefineImplicitMoveAssignment(DefaultLoc, MD); 10292 break; 10293 } 10294 10295 case CXXInvalid: 10296 llvm_unreachable("Invalid special member."); 10297 } 10298 } else { 10299 Diag(DefaultLoc, diag::err_default_special_members); 10300 } 10301} 10302 10303static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10304 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10305 Stmt *SubStmt = *CI; 10306 if (!SubStmt) 10307 continue; 10308 if (isa<ReturnStmt>(SubStmt)) 10309 Self.Diag(SubStmt->getSourceRange().getBegin(), 10310 diag::err_return_in_constructor_handler); 10311 if (!isa<Expr>(SubStmt)) 10312 SearchForReturnInStmt(Self, SubStmt); 10313 } 10314} 10315 10316void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10317 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10318 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10319 SearchForReturnInStmt(*this, Handler); 10320 } 10321} 10322 10323bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10324 const CXXMethodDecl *Old) { 10325 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10326 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10327 10328 if (Context.hasSameType(NewTy, OldTy) || 10329 NewTy->isDependentType() || OldTy->isDependentType()) 10330 return false; 10331 10332 // Check if the return types are covariant 10333 QualType NewClassTy, OldClassTy; 10334 10335 /// Both types must be pointers or references to classes. 10336 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10337 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10338 NewClassTy = NewPT->getPointeeType(); 10339 OldClassTy = OldPT->getPointeeType(); 10340 } 10341 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10342 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10343 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10344 NewClassTy = NewRT->getPointeeType(); 10345 OldClassTy = OldRT->getPointeeType(); 10346 } 10347 } 10348 } 10349 10350 // The return types aren't either both pointers or references to a class type. 10351 if (NewClassTy.isNull()) { 10352 Diag(New->getLocation(), 10353 diag::err_different_return_type_for_overriding_virtual_function) 10354 << New->getDeclName() << NewTy << OldTy; 10355 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10356 10357 return true; 10358 } 10359 10360 // C++ [class.virtual]p6: 10361 // If the return type of D::f differs from the return type of B::f, the 10362 // class type in the return type of D::f shall be complete at the point of 10363 // declaration of D::f or shall be the class type D. 10364 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10365 if (!RT->isBeingDefined() && 10366 RequireCompleteType(New->getLocation(), NewClassTy, 10367 PDiag(diag::err_covariant_return_incomplete) 10368 << New->getDeclName())) 10369 return true; 10370 } 10371 10372 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10373 // Check if the new class derives from the old class. 10374 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10375 Diag(New->getLocation(), 10376 diag::err_covariant_return_not_derived) 10377 << New->getDeclName() << NewTy << OldTy; 10378 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10379 return true; 10380 } 10381 10382 // Check if we the conversion from derived to base is valid. 10383 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10384 diag::err_covariant_return_inaccessible_base, 10385 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10386 // FIXME: Should this point to the return type? 10387 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10388 // FIXME: this note won't trigger for delayed access control 10389 // diagnostics, and it's impossible to get an undelayed error 10390 // here from access control during the original parse because 10391 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10393 return true; 10394 } 10395 } 10396 10397 // The qualifiers of the return types must be the same. 10398 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10399 Diag(New->getLocation(), 10400 diag::err_covariant_return_type_different_qualifications) 10401 << New->getDeclName() << NewTy << OldTy; 10402 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10403 return true; 10404 }; 10405 10406 10407 // The new class type must have the same or less qualifiers as the old type. 10408 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10409 Diag(New->getLocation(), 10410 diag::err_covariant_return_type_class_type_more_qualified) 10411 << New->getDeclName() << NewTy << OldTy; 10412 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10413 return true; 10414 }; 10415 10416 return false; 10417} 10418 10419/// \brief Mark the given method pure. 10420/// 10421/// \param Method the method to be marked pure. 10422/// 10423/// \param InitRange the source range that covers the "0" initializer. 10424bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10425 SourceLocation EndLoc = InitRange.getEnd(); 10426 if (EndLoc.isValid()) 10427 Method->setRangeEnd(EndLoc); 10428 10429 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10430 Method->setPure(); 10431 return false; 10432 } 10433 10434 if (!Method->isInvalidDecl()) 10435 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10436 << Method->getDeclName() << InitRange; 10437 return true; 10438} 10439 10440/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10441/// an initializer for the out-of-line declaration 'Dcl'. The scope 10442/// is a fresh scope pushed for just this purpose. 10443/// 10444/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10445/// static data member of class X, names should be looked up in the scope of 10446/// class X. 10447void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10448 // If there is no declaration, there was an error parsing it. 10449 if (D == 0 || D->isInvalidDecl()) return; 10450 10451 // We should only get called for declarations with scope specifiers, like: 10452 // int foo::bar; 10453 assert(D->isOutOfLine()); 10454 EnterDeclaratorContext(S, D->getDeclContext()); 10455} 10456 10457/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10458/// initializer for the out-of-line declaration 'D'. 10459void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10460 // If there is no declaration, there was an error parsing it. 10461 if (D == 0 || D->isInvalidDecl()) return; 10462 10463 assert(D->isOutOfLine()); 10464 ExitDeclaratorContext(S); 10465} 10466 10467/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10468/// C++ if/switch/while/for statement. 10469/// e.g: "if (int x = f()) {...}" 10470DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10471 // C++ 6.4p2: 10472 // The declarator shall not specify a function or an array. 10473 // The type-specifier-seq shall not contain typedef and shall not declare a 10474 // new class or enumeration. 10475 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10476 "Parser allowed 'typedef' as storage class of condition decl."); 10477 10478 Decl *Dcl = ActOnDeclarator(S, D); 10479 if (!Dcl) 10480 return true; 10481 10482 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10483 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10484 << D.getSourceRange(); 10485 return true; 10486 } 10487 10488 return Dcl; 10489} 10490 10491void Sema::LoadExternalVTableUses() { 10492 if (!ExternalSource) 10493 return; 10494 10495 SmallVector<ExternalVTableUse, 4> VTables; 10496 ExternalSource->ReadUsedVTables(VTables); 10497 SmallVector<VTableUse, 4> NewUses; 10498 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10499 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10500 = VTablesUsed.find(VTables[I].Record); 10501 // Even if a definition wasn't required before, it may be required now. 10502 if (Pos != VTablesUsed.end()) { 10503 if (!Pos->second && VTables[I].DefinitionRequired) 10504 Pos->second = true; 10505 continue; 10506 } 10507 10508 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10509 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10510 } 10511 10512 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10513} 10514 10515void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10516 bool DefinitionRequired) { 10517 // Ignore any vtable uses in unevaluated operands or for classes that do 10518 // not have a vtable. 10519 if (!Class->isDynamicClass() || Class->isDependentContext() || 10520 CurContext->isDependentContext() || 10521 ExprEvalContexts.back().Context == Unevaluated) 10522 return; 10523 10524 // Try to insert this class into the map. 10525 LoadExternalVTableUses(); 10526 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10527 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10528 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10529 if (!Pos.second) { 10530 // If we already had an entry, check to see if we are promoting this vtable 10531 // to required a definition. If so, we need to reappend to the VTableUses 10532 // list, since we may have already processed the first entry. 10533 if (DefinitionRequired && !Pos.first->second) { 10534 Pos.first->second = true; 10535 } else { 10536 // Otherwise, we can early exit. 10537 return; 10538 } 10539 } 10540 10541 // Local classes need to have their virtual members marked 10542 // immediately. For all other classes, we mark their virtual members 10543 // at the end of the translation unit. 10544 if (Class->isLocalClass()) 10545 MarkVirtualMembersReferenced(Loc, Class); 10546 else 10547 VTableUses.push_back(std::make_pair(Class, Loc)); 10548} 10549 10550bool Sema::DefineUsedVTables() { 10551 LoadExternalVTableUses(); 10552 if (VTableUses.empty()) 10553 return false; 10554 10555 // Note: The VTableUses vector could grow as a result of marking 10556 // the members of a class as "used", so we check the size each 10557 // time through the loop and prefer indices (with are stable) to 10558 // iterators (which are not). 10559 bool DefinedAnything = false; 10560 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10561 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10562 if (!Class) 10563 continue; 10564 10565 SourceLocation Loc = VTableUses[I].second; 10566 10567 // If this class has a key function, but that key function is 10568 // defined in another translation unit, we don't need to emit the 10569 // vtable even though we're using it. 10570 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10571 if (KeyFunction && !KeyFunction->hasBody()) { 10572 switch (KeyFunction->getTemplateSpecializationKind()) { 10573 case TSK_Undeclared: 10574 case TSK_ExplicitSpecialization: 10575 case TSK_ExplicitInstantiationDeclaration: 10576 // The key function is in another translation unit. 10577 continue; 10578 10579 case TSK_ExplicitInstantiationDefinition: 10580 case TSK_ImplicitInstantiation: 10581 // We will be instantiating the key function. 10582 break; 10583 } 10584 } else if (!KeyFunction) { 10585 // If we have a class with no key function that is the subject 10586 // of an explicit instantiation declaration, suppress the 10587 // vtable; it will live with the explicit instantiation 10588 // definition. 10589 bool IsExplicitInstantiationDeclaration 10590 = Class->getTemplateSpecializationKind() 10591 == TSK_ExplicitInstantiationDeclaration; 10592 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10593 REnd = Class->redecls_end(); 10594 R != REnd; ++R) { 10595 TemplateSpecializationKind TSK 10596 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10597 if (TSK == TSK_ExplicitInstantiationDeclaration) 10598 IsExplicitInstantiationDeclaration = true; 10599 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10600 IsExplicitInstantiationDeclaration = false; 10601 break; 10602 } 10603 } 10604 10605 if (IsExplicitInstantiationDeclaration) 10606 continue; 10607 } 10608 10609 // Mark all of the virtual members of this class as referenced, so 10610 // that we can build a vtable. Then, tell the AST consumer that a 10611 // vtable for this class is required. 10612 DefinedAnything = true; 10613 MarkVirtualMembersReferenced(Loc, Class); 10614 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10615 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10616 10617 // Optionally warn if we're emitting a weak vtable. 10618 if (Class->getLinkage() == ExternalLinkage && 10619 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10620 const FunctionDecl *KeyFunctionDef = 0; 10621 if (!KeyFunction || 10622 (KeyFunction->hasBody(KeyFunctionDef) && 10623 KeyFunctionDef->isInlined())) 10624 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10625 TSK_ExplicitInstantiationDefinition 10626 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10627 << Class; 10628 } 10629 } 10630 VTableUses.clear(); 10631 10632 return DefinedAnything; 10633} 10634 10635void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10636 const CXXRecordDecl *RD) { 10637 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10638 e = RD->method_end(); i != e; ++i) { 10639 CXXMethodDecl *MD = *i; 10640 10641 // C++ [basic.def.odr]p2: 10642 // [...] A virtual member function is used if it is not pure. [...] 10643 if (MD->isVirtual() && !MD->isPure()) 10644 MarkDeclarationReferenced(Loc, MD); 10645 } 10646 10647 // Only classes that have virtual bases need a VTT. 10648 if (RD->getNumVBases() == 0) 10649 return; 10650 10651 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10652 e = RD->bases_end(); i != e; ++i) { 10653 const CXXRecordDecl *Base = 10654 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10655 if (Base->getNumVBases() == 0) 10656 continue; 10657 MarkVirtualMembersReferenced(Loc, Base); 10658 } 10659} 10660 10661/// SetIvarInitializers - This routine builds initialization ASTs for the 10662/// Objective-C implementation whose ivars need be initialized. 10663void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10664 if (!getLangOptions().CPlusPlus) 10665 return; 10666 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10667 SmallVector<ObjCIvarDecl*, 8> ivars; 10668 CollectIvarsToConstructOrDestruct(OID, ivars); 10669 if (ivars.empty()) 10670 return; 10671 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10672 for (unsigned i = 0; i < ivars.size(); i++) { 10673 FieldDecl *Field = ivars[i]; 10674 if (Field->isInvalidDecl()) 10675 continue; 10676 10677 CXXCtorInitializer *Member; 10678 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10679 InitializationKind InitKind = 10680 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10681 10682 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10683 ExprResult MemberInit = 10684 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10685 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10686 // Note, MemberInit could actually come back empty if no initialization 10687 // is required (e.g., because it would call a trivial default constructor) 10688 if (!MemberInit.get() || MemberInit.isInvalid()) 10689 continue; 10690 10691 Member = 10692 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10693 SourceLocation(), 10694 MemberInit.takeAs<Expr>(), 10695 SourceLocation()); 10696 AllToInit.push_back(Member); 10697 10698 // Be sure that the destructor is accessible and is marked as referenced. 10699 if (const RecordType *RecordTy 10700 = Context.getBaseElementType(Field->getType()) 10701 ->getAs<RecordType>()) { 10702 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10703 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10704 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10705 CheckDestructorAccess(Field->getLocation(), Destructor, 10706 PDiag(diag::err_access_dtor_ivar) 10707 << Context.getBaseElementType(Field->getType())); 10708 } 10709 } 10710 } 10711 ObjCImplementation->setIvarInitializers(Context, 10712 AllToInit.data(), AllToInit.size()); 10713 } 10714} 10715 10716static 10717void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10718 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10719 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10720 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10721 Sema &S) { 10722 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10723 CE = Current.end(); 10724 if (Ctor->isInvalidDecl()) 10725 return; 10726 10727 const FunctionDecl *FNTarget = 0; 10728 CXXConstructorDecl *Target; 10729 10730 // We ignore the result here since if we don't have a body, Target will be 10731 // null below. 10732 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10733 Target 10734= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10735 10736 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10737 // Avoid dereferencing a null pointer here. 10738 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10739 10740 if (!Current.insert(Canonical)) 10741 return; 10742 10743 // We know that beyond here, we aren't chaining into a cycle. 10744 if (!Target || !Target->isDelegatingConstructor() || 10745 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10746 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10747 Valid.insert(*CI); 10748 Current.clear(); 10749 // We've hit a cycle. 10750 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10751 Current.count(TCanonical)) { 10752 // If we haven't diagnosed this cycle yet, do so now. 10753 if (!Invalid.count(TCanonical)) { 10754 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10755 diag::warn_delegating_ctor_cycle) 10756 << Ctor; 10757 10758 // Don't add a note for a function delegating directo to itself. 10759 if (TCanonical != Canonical) 10760 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10761 10762 CXXConstructorDecl *C = Target; 10763 while (C->getCanonicalDecl() != Canonical) { 10764 (void)C->getTargetConstructor()->hasBody(FNTarget); 10765 assert(FNTarget && "Ctor cycle through bodiless function"); 10766 10767 C 10768 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10769 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10770 } 10771 } 10772 10773 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10774 Invalid.insert(*CI); 10775 Current.clear(); 10776 } else { 10777 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10778 } 10779} 10780 10781 10782void Sema::CheckDelegatingCtorCycles() { 10783 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10784 10785 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10786 CE = Current.end(); 10787 10788 for (DelegatingCtorDeclsType::iterator 10789 I = DelegatingCtorDecls.begin(ExternalSource), 10790 E = DelegatingCtorDecls.end(); 10791 I != E; ++I) { 10792 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10793 } 10794 10795 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10796 (*CI)->setInvalidDecl(); 10797} 10798 10799/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10800Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10801 // Implicitly declared functions (e.g. copy constructors) are 10802 // __host__ __device__ 10803 if (D->isImplicit()) 10804 return CFT_HostDevice; 10805 10806 if (D->hasAttr<CUDAGlobalAttr>()) 10807 return CFT_Global; 10808 10809 if (D->hasAttr<CUDADeviceAttr>()) { 10810 if (D->hasAttr<CUDAHostAttr>()) 10811 return CFT_HostDevice; 10812 else 10813 return CFT_Device; 10814 } 10815 10816 return CFT_Host; 10817} 10818 10819bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10820 CUDAFunctionTarget CalleeTarget) { 10821 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10822 // Callable from the device only." 10823 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10824 return true; 10825 10826 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10827 // Callable from the host only." 10828 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10829 // Callable from the host only." 10830 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10831 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10832 return true; 10833 10834 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10835 return true; 10836 10837 return false; 10838} 10839