SemaDeclCXX.cpp revision 5d8419c12a1ffaf710fa11fb1091f10f03f2c1dc
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer. 1749MemInitResult 1750Sema::BuildMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 SourceLocation IdLoc, 1756 const MultiInitializer &Args, 1757 SourceLocation EllipsisLoc) { 1758 if (!ConstructorD) 1759 return true; 1760 1761 AdjustDeclIfTemplate(ConstructorD); 1762 1763 CXXConstructorDecl *Constructor 1764 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1765 if (!Constructor) { 1766 // The user wrote a constructor initializer on a function that is 1767 // not a C++ constructor. Ignore the error for now, because we may 1768 // have more member initializers coming; we'll diagnose it just 1769 // once in ActOnMemInitializers. 1770 return true; 1771 } 1772 1773 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1774 1775 // C++ [class.base.init]p2: 1776 // Names in a mem-initializer-id are looked up in the scope of the 1777 // constructor's class and, if not found in that scope, are looked 1778 // up in the scope containing the constructor's definition. 1779 // [Note: if the constructor's class contains a member with the 1780 // same name as a direct or virtual base class of the class, a 1781 // mem-initializer-id naming the member or base class and composed 1782 // of a single identifier refers to the class member. A 1783 // mem-initializer-id for the hidden base class may be specified 1784 // using a qualified name. ] 1785 if (!SS.getScopeRep() && !TemplateTypeTy) { 1786 // Look for a member, first. 1787 DeclContext::lookup_result Result 1788 = ClassDecl->lookup(MemberOrBase); 1789 if (Result.first != Result.second) { 1790 ValueDecl *Member; 1791 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1792 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1793 if (EllipsisLoc.isValid()) 1794 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1795 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1796 1797 return BuildMemberInitializer(Member, Args, IdLoc); 1798 } 1799 } 1800 } 1801 // It didn't name a member, so see if it names a class. 1802 QualType BaseType; 1803 TypeSourceInfo *TInfo = 0; 1804 1805 if (TemplateTypeTy) { 1806 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1807 } else { 1808 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1809 LookupParsedName(R, S, &SS); 1810 1811 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1812 if (!TyD) { 1813 if (R.isAmbiguous()) return true; 1814 1815 // We don't want access-control diagnostics here. 1816 R.suppressDiagnostics(); 1817 1818 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1819 bool NotUnknownSpecialization = false; 1820 DeclContext *DC = computeDeclContext(SS, false); 1821 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1822 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1823 1824 if (!NotUnknownSpecialization) { 1825 // When the scope specifier can refer to a member of an unknown 1826 // specialization, we take it as a type name. 1827 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1828 SS.getWithLocInContext(Context), 1829 *MemberOrBase, IdLoc); 1830 if (BaseType.isNull()) 1831 return true; 1832 1833 R.clear(); 1834 R.setLookupName(MemberOrBase); 1835 } 1836 } 1837 1838 // If no results were found, try to correct typos. 1839 TypoCorrection Corr; 1840 if (R.empty() && BaseType.isNull() && 1841 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1842 ClassDecl, false, CTC_NoKeywords))) { 1843 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1844 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1845 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1846 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1847 // We have found a non-static data member with a similar 1848 // name to what was typed; complain and initialize that 1849 // member. 1850 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1851 << MemberOrBase << true << CorrectedQuotedStr 1852 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1853 Diag(Member->getLocation(), diag::note_previous_decl) 1854 << CorrectedQuotedStr; 1855 1856 return BuildMemberInitializer(Member, Args, IdLoc); 1857 } 1858 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1859 const CXXBaseSpecifier *DirectBaseSpec; 1860 const CXXBaseSpecifier *VirtualBaseSpec; 1861 if (FindBaseInitializer(*this, ClassDecl, 1862 Context.getTypeDeclType(Type), 1863 DirectBaseSpec, VirtualBaseSpec)) { 1864 // We have found a direct or virtual base class with a 1865 // similar name to what was typed; complain and initialize 1866 // that base class. 1867 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1868 << MemberOrBase << false << CorrectedQuotedStr 1869 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1870 1871 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1872 : VirtualBaseSpec; 1873 Diag(BaseSpec->getSourceRange().getBegin(), 1874 diag::note_base_class_specified_here) 1875 << BaseSpec->getType() 1876 << BaseSpec->getSourceRange(); 1877 1878 TyD = Type; 1879 } 1880 } 1881 } 1882 1883 if (!TyD && BaseType.isNull()) { 1884 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1885 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1886 return true; 1887 } 1888 } 1889 1890 if (BaseType.isNull()) { 1891 BaseType = Context.getTypeDeclType(TyD); 1892 if (SS.isSet()) { 1893 NestedNameSpecifier *Qualifier = 1894 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1895 1896 // FIXME: preserve source range information 1897 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1898 } 1899 } 1900 } 1901 1902 if (!TInfo) 1903 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1904 1905 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1906} 1907 1908/// Checks a member initializer expression for cases where reference (or 1909/// pointer) members are bound to by-value parameters (or their addresses). 1910static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1911 Expr *Init, 1912 SourceLocation IdLoc) { 1913 QualType MemberTy = Member->getType(); 1914 1915 // We only handle pointers and references currently. 1916 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1917 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1918 return; 1919 1920 const bool IsPointer = MemberTy->isPointerType(); 1921 if (IsPointer) { 1922 if (const UnaryOperator *Op 1923 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1924 // The only case we're worried about with pointers requires taking the 1925 // address. 1926 if (Op->getOpcode() != UO_AddrOf) 1927 return; 1928 1929 Init = Op->getSubExpr(); 1930 } else { 1931 // We only handle address-of expression initializers for pointers. 1932 return; 1933 } 1934 } 1935 1936 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1937 // Taking the address of a temporary will be diagnosed as a hard error. 1938 if (IsPointer) 1939 return; 1940 1941 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1942 << Member << Init->getSourceRange(); 1943 } else if (const DeclRefExpr *DRE 1944 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1945 // We only warn when referring to a non-reference parameter declaration. 1946 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1947 if (!Parameter || Parameter->getType()->isReferenceType()) 1948 return; 1949 1950 S.Diag(Init->getExprLoc(), 1951 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1952 : diag::warn_bind_ref_member_to_parameter) 1953 << Member << Parameter << Init->getSourceRange(); 1954 } else { 1955 // Other initializers are fine. 1956 return; 1957 } 1958 1959 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1960 << (unsigned)IsPointer; 1961} 1962 1963/// Checks an initializer expression for use of uninitialized fields, such as 1964/// containing the field that is being initialized. Returns true if there is an 1965/// uninitialized field was used an updates the SourceLocation parameter; false 1966/// otherwise. 1967static bool InitExprContainsUninitializedFields(const Stmt *S, 1968 const ValueDecl *LhsField, 1969 SourceLocation *L) { 1970 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1971 1972 if (isa<CallExpr>(S)) { 1973 // Do not descend into function calls or constructors, as the use 1974 // of an uninitialized field may be valid. One would have to inspect 1975 // the contents of the function/ctor to determine if it is safe or not. 1976 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1977 // may be safe, depending on what the function/ctor does. 1978 return false; 1979 } 1980 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1981 const NamedDecl *RhsField = ME->getMemberDecl(); 1982 1983 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1984 // The member expression points to a static data member. 1985 assert(VD->isStaticDataMember() && 1986 "Member points to non-static data member!"); 1987 (void)VD; 1988 return false; 1989 } 1990 1991 if (isa<EnumConstantDecl>(RhsField)) { 1992 // The member expression points to an enum. 1993 return false; 1994 } 1995 1996 if (RhsField == LhsField) { 1997 // Initializing a field with itself. Throw a warning. 1998 // But wait; there are exceptions! 1999 // Exception #1: The field may not belong to this record. 2000 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2001 const Expr *base = ME->getBase(); 2002 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2003 // Even though the field matches, it does not belong to this record. 2004 return false; 2005 } 2006 // None of the exceptions triggered; return true to indicate an 2007 // uninitialized field was used. 2008 *L = ME->getMemberLoc(); 2009 return true; 2010 } 2011 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2012 // sizeof/alignof doesn't reference contents, do not warn. 2013 return false; 2014 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2015 // address-of doesn't reference contents (the pointer may be dereferenced 2016 // in the same expression but it would be rare; and weird). 2017 if (UOE->getOpcode() == UO_AddrOf) 2018 return false; 2019 } 2020 for (Stmt::const_child_range it = S->children(); it; ++it) { 2021 if (!*it) { 2022 // An expression such as 'member(arg ?: "")' may trigger this. 2023 continue; 2024 } 2025 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2026 return true; 2027 } 2028 return false; 2029} 2030 2031MemInitResult 2032Sema::BuildMemberInitializer(ValueDecl *Member, 2033 const MultiInitializer &Args, 2034 SourceLocation IdLoc) { 2035 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2036 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2037 assert((DirectMember || IndirectMember) && 2038 "Member must be a FieldDecl or IndirectFieldDecl"); 2039 2040 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2041 return true; 2042 2043 if (Member->isInvalidDecl()) 2044 return true; 2045 2046 // Diagnose value-uses of fields to initialize themselves, e.g. 2047 // foo(foo) 2048 // where foo is not also a parameter to the constructor. 2049 // TODO: implement -Wuninitialized and fold this into that framework. 2050 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2051 I != E; ++I) { 2052 SourceLocation L; 2053 Expr *Arg = *I; 2054 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2055 Arg = DIE->getInit(); 2056 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2057 // FIXME: Return true in the case when other fields are used before being 2058 // uninitialized. For example, let this field be the i'th field. When 2059 // initializing the i'th field, throw a warning if any of the >= i'th 2060 // fields are used, as they are not yet initialized. 2061 // Right now we are only handling the case where the i'th field uses 2062 // itself in its initializer. 2063 Diag(L, diag::warn_field_is_uninit); 2064 } 2065 } 2066 2067 bool HasDependentArg = Args.isTypeDependent(); 2068 2069 Expr *Init; 2070 if (Member->getType()->isDependentType() || HasDependentArg) { 2071 // Can't check initialization for a member of dependent type or when 2072 // any of the arguments are type-dependent expressions. 2073 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2074 2075 DiscardCleanupsInEvaluationContext(); 2076 } else { 2077 // Initialize the member. 2078 InitializedEntity MemberEntity = 2079 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2080 : InitializedEntity::InitializeMember(IndirectMember, 0); 2081 InitializationKind Kind = 2082 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2083 Args.getEndLoc()); 2084 2085 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2086 if (MemberInit.isInvalid()) 2087 return true; 2088 2089 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2090 2091 // C++0x [class.base.init]p7: 2092 // The initialization of each base and member constitutes a 2093 // full-expression. 2094 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2095 if (MemberInit.isInvalid()) 2096 return true; 2097 2098 // If we are in a dependent context, template instantiation will 2099 // perform this type-checking again. Just save the arguments that we 2100 // received in a ParenListExpr. 2101 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2102 // of the information that we have about the member 2103 // initializer. However, deconstructing the ASTs is a dicey process, 2104 // and this approach is far more likely to get the corner cases right. 2105 if (CurContext->isDependentContext()) { 2106 Init = Args.CreateInitExpr(Context, 2107 Member->getType().getNonReferenceType()); 2108 } else { 2109 Init = MemberInit.get(); 2110 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2111 } 2112 } 2113 2114 if (DirectMember) { 2115 return new (Context) CXXCtorInitializer(Context, DirectMember, 2116 IdLoc, Args.getStartLoc(), 2117 Init, Args.getEndLoc()); 2118 } else { 2119 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } 2123} 2124 2125MemInitResult 2126Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2127 const MultiInitializer &Args, 2128 CXXRecordDecl *ClassDecl) { 2129 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2130 if (!LangOpts.CPlusPlus0x) 2131 return Diag(NameLoc, diag::err_delegating_ctor) 2132 << TInfo->getTypeLoc().getLocalSourceRange(); 2133 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2134 2135 // Initialize the object. 2136 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2137 QualType(ClassDecl->getTypeForDecl(), 0)); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2143 if (DelegationInit.isInvalid()) 2144 return true; 2145 2146 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2147 "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2159 DelegationInit.takeAs<Expr>(), 2160 Args.getEndLoc()); 2161} 2162 2163MemInitResult 2164Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2165 const MultiInitializer &Args, 2166 CXXRecordDecl *ClassDecl, 2167 SourceLocation EllipsisLoc) { 2168 bool HasDependentArg = Args.isTypeDependent(); 2169 2170 SourceLocation BaseLoc 2171 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2172 2173 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2174 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2175 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2176 2177 // C++ [class.base.init]p2: 2178 // [...] Unless the mem-initializer-id names a nonstatic data 2179 // member of the constructor's class or a direct or virtual base 2180 // of that class, the mem-initializer is ill-formed. A 2181 // mem-initializer-list can initialize a base class using any 2182 // name that denotes that base class type. 2183 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2184 2185 if (EllipsisLoc.isValid()) { 2186 // This is a pack expansion. 2187 if (!BaseType->containsUnexpandedParameterPack()) { 2188 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2189 << SourceRange(BaseLoc, Args.getEndLoc()); 2190 2191 EllipsisLoc = SourceLocation(); 2192 } 2193 } else { 2194 // Check for any unexpanded parameter packs. 2195 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2196 return true; 2197 2198 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2199 return true; 2200 } 2201 2202 // Check for direct and virtual base classes. 2203 const CXXBaseSpecifier *DirectBaseSpec = 0; 2204 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2205 if (!Dependent) { 2206 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2207 BaseType)) 2208 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2209 2210 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2211 VirtualBaseSpec); 2212 2213 // C++ [base.class.init]p2: 2214 // Unless the mem-initializer-id names a nonstatic data member of the 2215 // constructor's class or a direct or virtual base of that class, the 2216 // mem-initializer is ill-formed. 2217 if (!DirectBaseSpec && !VirtualBaseSpec) { 2218 // If the class has any dependent bases, then it's possible that 2219 // one of those types will resolve to the same type as 2220 // BaseType. Therefore, just treat this as a dependent base 2221 // class initialization. FIXME: Should we try to check the 2222 // initialization anyway? It seems odd. 2223 if (ClassDecl->hasAnyDependentBases()) 2224 Dependent = true; 2225 else 2226 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2227 << BaseType << Context.getTypeDeclType(ClassDecl) 2228 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 } 2230 } 2231 2232 if (Dependent) { 2233 // Can't check initialization for a base of dependent type or when 2234 // any of the arguments are type-dependent expressions. 2235 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2236 2237 DiscardCleanupsInEvaluationContext(); 2238 2239 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2240 /*IsVirtual=*/false, 2241 Args.getStartLoc(), BaseInit, 2242 Args.getEndLoc(), EllipsisLoc); 2243 } 2244 2245 // C++ [base.class.init]p2: 2246 // If a mem-initializer-id is ambiguous because it designates both 2247 // a direct non-virtual base class and an inherited virtual base 2248 // class, the mem-initializer is ill-formed. 2249 if (DirectBaseSpec && VirtualBaseSpec) 2250 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 CXXBaseSpecifier *BaseSpec 2254 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2255 if (!BaseSpec) 2256 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2257 2258 // Initialize the base. 2259 InitializedEntity BaseEntity = 2260 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2261 InitializationKind Kind = 2262 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2263 Args.getEndLoc()); 2264 2265 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2266 if (BaseInit.isInvalid()) 2267 return true; 2268 2269 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2270 2271 // C++0x [class.base.init]p7: 2272 // The initialization of each base and member constitutes a 2273 // full-expression. 2274 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2275 if (BaseInit.isInvalid()) 2276 return true; 2277 2278 // If we are in a dependent context, template instantiation will 2279 // perform this type-checking again. Just save the arguments that we 2280 // received in a ParenListExpr. 2281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2282 // of the information that we have about the base 2283 // initializer. However, deconstructing the ASTs is a dicey process, 2284 // and this approach is far more likely to get the corner cases right. 2285 if (CurContext->isDependentContext()) 2286 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2287 2288 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2289 BaseSpec->isVirtual(), 2290 Args.getStartLoc(), 2291 BaseInit.takeAs<Expr>(), 2292 Args.getEndLoc(), EllipsisLoc); 2293} 2294 2295// Create a static_cast\<T&&>(expr). 2296static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2297 QualType ExprType = E->getType(); 2298 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2299 SourceLocation ExprLoc = E->getLocStart(); 2300 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2301 TargetType, ExprLoc); 2302 2303 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2304 SourceRange(ExprLoc, ExprLoc), 2305 E->getSourceRange()).take(); 2306} 2307 2308/// ImplicitInitializerKind - How an implicit base or member initializer should 2309/// initialize its base or member. 2310enum ImplicitInitializerKind { 2311 IIK_Default, 2312 IIK_Copy, 2313 IIK_Move 2314}; 2315 2316static bool 2317BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2318 ImplicitInitializerKind ImplicitInitKind, 2319 CXXBaseSpecifier *BaseSpec, 2320 bool IsInheritedVirtualBase, 2321 CXXCtorInitializer *&CXXBaseInit) { 2322 InitializedEntity InitEntity 2323 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2324 IsInheritedVirtualBase); 2325 2326 ExprResult BaseInit; 2327 2328 switch (ImplicitInitKind) { 2329 case IIK_Default: { 2330 InitializationKind InitKind 2331 = InitializationKind::CreateDefault(Constructor->getLocation()); 2332 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2333 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2334 MultiExprArg(SemaRef, 0, 0)); 2335 break; 2336 } 2337 2338 case IIK_Move: 2339 case IIK_Copy: { 2340 bool Moving = ImplicitInitKind == IIK_Move; 2341 ParmVarDecl *Param = Constructor->getParamDecl(0); 2342 QualType ParamType = Param->getType().getNonReferenceType(); 2343 2344 Expr *CopyCtorArg = 2345 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2346 Constructor->getLocation(), ParamType, 2347 VK_LValue, 0); 2348 2349 // Cast to the base class to avoid ambiguities. 2350 QualType ArgTy = 2351 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2352 ParamType.getQualifiers()); 2353 2354 if (Moving) { 2355 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2356 } 2357 2358 CXXCastPath BasePath; 2359 BasePath.push_back(BaseSpec); 2360 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2361 CK_UncheckedDerivedToBase, 2362 Moving ? VK_XValue : VK_LValue, 2363 &BasePath).take(); 2364 2365 InitializationKind InitKind 2366 = InitializationKind::CreateDirect(Constructor->getLocation(), 2367 SourceLocation(), SourceLocation()); 2368 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2369 &CopyCtorArg, 1); 2370 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2371 MultiExprArg(&CopyCtorArg, 1)); 2372 break; 2373 } 2374 } 2375 2376 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2377 if (BaseInit.isInvalid()) 2378 return true; 2379 2380 CXXBaseInit = 2381 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2382 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2383 SourceLocation()), 2384 BaseSpec->isVirtual(), 2385 SourceLocation(), 2386 BaseInit.takeAs<Expr>(), 2387 SourceLocation(), 2388 SourceLocation()); 2389 2390 return false; 2391} 2392 2393static bool RefersToRValueRef(Expr *MemRef) { 2394 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2395 return Referenced->getType()->isRValueReferenceType(); 2396} 2397 2398static bool 2399BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 FieldDecl *Field, IndirectFieldDecl *Indirect, 2402 CXXCtorInitializer *&CXXMemberInit) { 2403 if (Field->isInvalidDecl()) 2404 return true; 2405 2406 SourceLocation Loc = Constructor->getLocation(); 2407 2408 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2409 bool Moving = ImplicitInitKind == IIK_Move; 2410 ParmVarDecl *Param = Constructor->getParamDecl(0); 2411 QualType ParamType = Param->getType().getNonReferenceType(); 2412 2413 // Suppress copying zero-width bitfields. 2414 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636}; 2637} 2638 2639/// \brief Determine whether the given indirect field declaration is somewhere 2640/// within an anonymous union. 2641static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2642 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2643 CEnd = F->chain_end(); 2644 C != CEnd; ++C) 2645 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2646 if (Record->isUnion()) 2647 return true; 2648 2649 return false; 2650} 2651 2652static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2653 FieldDecl *Field, 2654 IndirectFieldDecl *Indirect = 0) { 2655 2656 // Overwhelmingly common case: we have a direct initializer for this field. 2657 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2658 Info.AllToInit.push_back(Init); 2659 return false; 2660 } 2661 2662 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2663 // has a brace-or-equal-initializer, the entity is initialized as specified 2664 // in [dcl.init]. 2665 if (Field->hasInClassInitializer()) { 2666 CXXCtorInitializer *Init; 2667 if (Indirect) 2668 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2669 SourceLocation(), 2670 SourceLocation(), 0, 2671 SourceLocation()); 2672 else 2673 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2674 SourceLocation(), 2675 SourceLocation(), 0, 2676 SourceLocation()); 2677 Info.AllToInit.push_back(Init); 2678 return false; 2679 } 2680 2681 // Don't build an implicit initializer for union members if none was 2682 // explicitly specified. 2683 if (Field->getParent()->isUnion() || 2684 (Indirect && isWithinAnonymousUnion(Indirect))) 2685 return false; 2686 2687 // Don't try to build an implicit initializer if there were semantic 2688 // errors in any of the initializers (and therefore we might be 2689 // missing some that the user actually wrote). 2690 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2691 return false; 2692 2693 CXXCtorInitializer *Init = 0; 2694 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2695 Indirect, Init)) 2696 return true; 2697 2698 if (Init) 2699 Info.AllToInit.push_back(Init); 2700 2701 return false; 2702} 2703 2704bool 2705Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2706 CXXCtorInitializer *Initializer) { 2707 assert(Initializer->isDelegatingInitializer()); 2708 Constructor->setNumCtorInitializers(1); 2709 CXXCtorInitializer **initializer = 2710 new (Context) CXXCtorInitializer*[1]; 2711 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2712 Constructor->setCtorInitializers(initializer); 2713 2714 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2715 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2716 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2717 } 2718 2719 DelegatingCtorDecls.push_back(Constructor); 2720 2721 return false; 2722} 2723 2724bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2725 CXXCtorInitializer **Initializers, 2726 unsigned NumInitializers, 2727 bool AnyErrors) { 2728 if (Constructor->isDependentContext()) { 2729 // Just store the initializers as written, they will be checked during 2730 // instantiation. 2731 if (NumInitializers > 0) { 2732 Constructor->setNumCtorInitializers(NumInitializers); 2733 CXXCtorInitializer **baseOrMemberInitializers = 2734 new (Context) CXXCtorInitializer*[NumInitializers]; 2735 memcpy(baseOrMemberInitializers, Initializers, 2736 NumInitializers * sizeof(CXXCtorInitializer*)); 2737 Constructor->setCtorInitializers(baseOrMemberInitializers); 2738 } 2739 2740 return false; 2741 } 2742 2743 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2744 2745 // We need to build the initializer AST according to order of construction 2746 // and not what user specified in the Initializers list. 2747 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2748 if (!ClassDecl) 2749 return true; 2750 2751 bool HadError = false; 2752 2753 for (unsigned i = 0; i < NumInitializers; i++) { 2754 CXXCtorInitializer *Member = Initializers[i]; 2755 2756 if (Member->isBaseInitializer()) 2757 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2758 else 2759 Info.AllBaseFields[Member->getAnyMember()] = Member; 2760 } 2761 2762 // Keep track of the direct virtual bases. 2763 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2764 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2765 E = ClassDecl->bases_end(); I != E; ++I) { 2766 if (I->isVirtual()) 2767 DirectVBases.insert(I); 2768 } 2769 2770 // Push virtual bases before others. 2771 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2772 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2773 2774 if (CXXCtorInitializer *Value 2775 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2776 Info.AllToInit.push_back(Value); 2777 } else if (!AnyErrors) { 2778 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2779 CXXCtorInitializer *CXXBaseInit; 2780 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2781 VBase, IsInheritedVirtualBase, 2782 CXXBaseInit)) { 2783 HadError = true; 2784 continue; 2785 } 2786 2787 Info.AllToInit.push_back(CXXBaseInit); 2788 } 2789 } 2790 2791 // Non-virtual bases. 2792 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2793 E = ClassDecl->bases_end(); Base != E; ++Base) { 2794 // Virtuals are in the virtual base list and already constructed. 2795 if (Base->isVirtual()) 2796 continue; 2797 2798 if (CXXCtorInitializer *Value 2799 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2800 Info.AllToInit.push_back(Value); 2801 } else if (!AnyErrors) { 2802 CXXCtorInitializer *CXXBaseInit; 2803 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2804 Base, /*IsInheritedVirtualBase=*/false, 2805 CXXBaseInit)) { 2806 HadError = true; 2807 continue; 2808 } 2809 2810 Info.AllToInit.push_back(CXXBaseInit); 2811 } 2812 } 2813 2814 // Fields. 2815 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2816 MemEnd = ClassDecl->decls_end(); 2817 Mem != MemEnd; ++Mem) { 2818 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2819 // C++ [class.bit]p2: 2820 // A declaration for a bit-field that omits the identifier declares an 2821 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2822 // initialized. 2823 if (F->isUnnamedBitfield()) 2824 continue; 2825 2826 if (F->getType()->isIncompleteArrayType()) { 2827 assert(ClassDecl->hasFlexibleArrayMember() && 2828 "Incomplete array type is not valid"); 2829 continue; 2830 } 2831 2832 // If we're not generating the implicit copy/move constructor, then we'll 2833 // handle anonymous struct/union fields based on their individual 2834 // indirect fields. 2835 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2836 continue; 2837 2838 if (CollectFieldInitializer(*this, Info, F)) 2839 HadError = true; 2840 continue; 2841 } 2842 2843 // Beyond this point, we only consider default initialization. 2844 if (Info.IIK != IIK_Default) 2845 continue; 2846 2847 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2848 if (F->getType()->isIncompleteArrayType()) { 2849 assert(ClassDecl->hasFlexibleArrayMember() && 2850 "Incomplete array type is not valid"); 2851 continue; 2852 } 2853 2854 // Initialize each field of an anonymous struct individually. 2855 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2856 HadError = true; 2857 2858 continue; 2859 } 2860 } 2861 2862 NumInitializers = Info.AllToInit.size(); 2863 if (NumInitializers > 0) { 2864 Constructor->setNumCtorInitializers(NumInitializers); 2865 CXXCtorInitializer **baseOrMemberInitializers = 2866 new (Context) CXXCtorInitializer*[NumInitializers]; 2867 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2868 NumInitializers * sizeof(CXXCtorInitializer*)); 2869 Constructor->setCtorInitializers(baseOrMemberInitializers); 2870 2871 // Constructors implicitly reference the base and member 2872 // destructors. 2873 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2874 Constructor->getParent()); 2875 } 2876 2877 return HadError; 2878} 2879 2880static void *GetKeyForTopLevelField(FieldDecl *Field) { 2881 // For anonymous unions, use the class declaration as the key. 2882 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2883 if (RT->getDecl()->isAnonymousStructOrUnion()) 2884 return static_cast<void *>(RT->getDecl()); 2885 } 2886 return static_cast<void *>(Field); 2887} 2888 2889static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2890 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2891} 2892 2893static void *GetKeyForMember(ASTContext &Context, 2894 CXXCtorInitializer *Member) { 2895 if (!Member->isAnyMemberInitializer()) 2896 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2897 2898 // For fields injected into the class via declaration of an anonymous union, 2899 // use its anonymous union class declaration as the unique key. 2900 FieldDecl *Field = Member->getAnyMember(); 2901 2902 // If the field is a member of an anonymous struct or union, our key 2903 // is the anonymous record decl that's a direct child of the class. 2904 RecordDecl *RD = Field->getParent(); 2905 if (RD->isAnonymousStructOrUnion()) { 2906 while (true) { 2907 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2908 if (Parent->isAnonymousStructOrUnion()) 2909 RD = Parent; 2910 else 2911 break; 2912 } 2913 2914 return static_cast<void *>(RD); 2915 } 2916 2917 return static_cast<void *>(Field); 2918} 2919 2920static void 2921DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2922 const CXXConstructorDecl *Constructor, 2923 CXXCtorInitializer **Inits, 2924 unsigned NumInits) { 2925 if (Constructor->getDeclContext()->isDependentContext()) 2926 return; 2927 2928 // Don't check initializers order unless the warning is enabled at the 2929 // location of at least one initializer. 2930 bool ShouldCheckOrder = false; 2931 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2932 CXXCtorInitializer *Init = Inits[InitIndex]; 2933 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2934 Init->getSourceLocation()) 2935 != DiagnosticsEngine::Ignored) { 2936 ShouldCheckOrder = true; 2937 break; 2938 } 2939 } 2940 if (!ShouldCheckOrder) 2941 return; 2942 2943 // Build the list of bases and members in the order that they'll 2944 // actually be initialized. The explicit initializers should be in 2945 // this same order but may be missing things. 2946 SmallVector<const void*, 32> IdealInitKeys; 2947 2948 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2949 2950 // 1. Virtual bases. 2951 for (CXXRecordDecl::base_class_const_iterator VBase = 2952 ClassDecl->vbases_begin(), 2953 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2954 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2955 2956 // 2. Non-virtual bases. 2957 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2958 E = ClassDecl->bases_end(); Base != E; ++Base) { 2959 if (Base->isVirtual()) 2960 continue; 2961 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2962 } 2963 2964 // 3. Direct fields. 2965 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2966 E = ClassDecl->field_end(); Field != E; ++Field) { 2967 if (Field->isUnnamedBitfield()) 2968 continue; 2969 2970 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2971 } 2972 2973 unsigned NumIdealInits = IdealInitKeys.size(); 2974 unsigned IdealIndex = 0; 2975 2976 CXXCtorInitializer *PrevInit = 0; 2977 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2978 CXXCtorInitializer *Init = Inits[InitIndex]; 2979 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2980 2981 // Scan forward to try to find this initializer in the idealized 2982 // initializers list. 2983 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2984 if (InitKey == IdealInitKeys[IdealIndex]) 2985 break; 2986 2987 // If we didn't find this initializer, it must be because we 2988 // scanned past it on a previous iteration. That can only 2989 // happen if we're out of order; emit a warning. 2990 if (IdealIndex == NumIdealInits && PrevInit) { 2991 Sema::SemaDiagnosticBuilder D = 2992 SemaRef.Diag(PrevInit->getSourceLocation(), 2993 diag::warn_initializer_out_of_order); 2994 2995 if (PrevInit->isAnyMemberInitializer()) 2996 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2997 else 2998 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 2999 3000 if (Init->isAnyMemberInitializer()) 3001 D << 0 << Init->getAnyMember()->getDeclName(); 3002 else 3003 D << 1 << Init->getTypeSourceInfo()->getType(); 3004 3005 // Move back to the initializer's location in the ideal list. 3006 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3007 if (InitKey == IdealInitKeys[IdealIndex]) 3008 break; 3009 3010 assert(IdealIndex != NumIdealInits && 3011 "initializer not found in initializer list"); 3012 } 3013 3014 PrevInit = Init; 3015 } 3016} 3017 3018namespace { 3019bool CheckRedundantInit(Sema &S, 3020 CXXCtorInitializer *Init, 3021 CXXCtorInitializer *&PrevInit) { 3022 if (!PrevInit) { 3023 PrevInit = Init; 3024 return false; 3025 } 3026 3027 if (FieldDecl *Field = Init->getMember()) 3028 S.Diag(Init->getSourceLocation(), 3029 diag::err_multiple_mem_initialization) 3030 << Field->getDeclName() 3031 << Init->getSourceRange(); 3032 else { 3033 const Type *BaseClass = Init->getBaseClass(); 3034 assert(BaseClass && "neither field nor base"); 3035 S.Diag(Init->getSourceLocation(), 3036 diag::err_multiple_base_initialization) 3037 << QualType(BaseClass, 0) 3038 << Init->getSourceRange(); 3039 } 3040 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3041 << 0 << PrevInit->getSourceRange(); 3042 3043 return true; 3044} 3045 3046typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3047typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3048 3049bool CheckRedundantUnionInit(Sema &S, 3050 CXXCtorInitializer *Init, 3051 RedundantUnionMap &Unions) { 3052 FieldDecl *Field = Init->getAnyMember(); 3053 RecordDecl *Parent = Field->getParent(); 3054 if (!Parent->isAnonymousStructOrUnion()) 3055 return false; 3056 3057 NamedDecl *Child = Field; 3058 do { 3059 if (Parent->isUnion()) { 3060 UnionEntry &En = Unions[Parent]; 3061 if (En.first && En.first != Child) { 3062 S.Diag(Init->getSourceLocation(), 3063 diag::err_multiple_mem_union_initialization) 3064 << Field->getDeclName() 3065 << Init->getSourceRange(); 3066 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3067 << 0 << En.second->getSourceRange(); 3068 return true; 3069 } else if (!En.first) { 3070 En.first = Child; 3071 En.second = Init; 3072 } 3073 } 3074 3075 Child = Parent; 3076 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3077 } while (Parent->isAnonymousStructOrUnion()); 3078 3079 return false; 3080} 3081} 3082 3083/// ActOnMemInitializers - Handle the member initializers for a constructor. 3084void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3085 SourceLocation ColonLoc, 3086 CXXCtorInitializer **meminits, 3087 unsigned NumMemInits, 3088 bool AnyErrors) { 3089 if (!ConstructorDecl) 3090 return; 3091 3092 AdjustDeclIfTemplate(ConstructorDecl); 3093 3094 CXXConstructorDecl *Constructor 3095 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3096 3097 if (!Constructor) { 3098 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3099 return; 3100 } 3101 3102 CXXCtorInitializer **MemInits = 3103 reinterpret_cast<CXXCtorInitializer **>(meminits); 3104 3105 // Mapping for the duplicate initializers check. 3106 // For member initializers, this is keyed with a FieldDecl*. 3107 // For base initializers, this is keyed with a Type*. 3108 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3109 3110 // Mapping for the inconsistent anonymous-union initializers check. 3111 RedundantUnionMap MemberUnions; 3112 3113 bool HadError = false; 3114 for (unsigned i = 0; i < NumMemInits; i++) { 3115 CXXCtorInitializer *Init = MemInits[i]; 3116 3117 // Set the source order index. 3118 Init->setSourceOrder(i); 3119 3120 if (Init->isAnyMemberInitializer()) { 3121 FieldDecl *Field = Init->getAnyMember(); 3122 if (CheckRedundantInit(*this, Init, Members[Field]) || 3123 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3124 HadError = true; 3125 } else if (Init->isBaseInitializer()) { 3126 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3127 if (CheckRedundantInit(*this, Init, Members[Key])) 3128 HadError = true; 3129 } else { 3130 assert(Init->isDelegatingInitializer()); 3131 // This must be the only initializer 3132 if (i != 0 || NumMemInits > 1) { 3133 Diag(MemInits[0]->getSourceLocation(), 3134 diag::err_delegating_initializer_alone) 3135 << MemInits[0]->getSourceRange(); 3136 HadError = true; 3137 // We will treat this as being the only initializer. 3138 } 3139 SetDelegatingInitializer(Constructor, MemInits[i]); 3140 // Return immediately as the initializer is set. 3141 return; 3142 } 3143 } 3144 3145 if (HadError) 3146 return; 3147 3148 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3149 3150 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3151} 3152 3153void 3154Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3155 CXXRecordDecl *ClassDecl) { 3156 // Ignore dependent contexts. Also ignore unions, since their members never 3157 // have destructors implicitly called. 3158 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3159 return; 3160 3161 // FIXME: all the access-control diagnostics are positioned on the 3162 // field/base declaration. That's probably good; that said, the 3163 // user might reasonably want to know why the destructor is being 3164 // emitted, and we currently don't say. 3165 3166 // Non-static data members. 3167 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3168 E = ClassDecl->field_end(); I != E; ++I) { 3169 FieldDecl *Field = *I; 3170 if (Field->isInvalidDecl()) 3171 continue; 3172 QualType FieldType = Context.getBaseElementType(Field->getType()); 3173 3174 const RecordType* RT = FieldType->getAs<RecordType>(); 3175 if (!RT) 3176 continue; 3177 3178 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3179 if (FieldClassDecl->isInvalidDecl()) 3180 continue; 3181 if (FieldClassDecl->hasTrivialDestructor()) 3182 continue; 3183 3184 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3185 assert(Dtor && "No dtor found for FieldClassDecl!"); 3186 CheckDestructorAccess(Field->getLocation(), Dtor, 3187 PDiag(diag::err_access_dtor_field) 3188 << Field->getDeclName() 3189 << FieldType); 3190 3191 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3192 } 3193 3194 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3195 3196 // Bases. 3197 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3198 E = ClassDecl->bases_end(); Base != E; ++Base) { 3199 // Bases are always records in a well-formed non-dependent class. 3200 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3201 3202 // Remember direct virtual bases. 3203 if (Base->isVirtual()) 3204 DirectVirtualBases.insert(RT); 3205 3206 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3207 // If our base class is invalid, we probably can't get its dtor anyway. 3208 if (BaseClassDecl->isInvalidDecl()) 3209 continue; 3210 // Ignore trivial destructors. 3211 if (BaseClassDecl->hasTrivialDestructor()) 3212 continue; 3213 3214 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3215 assert(Dtor && "No dtor found for BaseClassDecl!"); 3216 3217 // FIXME: caret should be on the start of the class name 3218 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3219 PDiag(diag::err_access_dtor_base) 3220 << Base->getType() 3221 << Base->getSourceRange()); 3222 3223 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3224 } 3225 3226 // Virtual bases. 3227 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3228 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3229 3230 // Bases are always records in a well-formed non-dependent class. 3231 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3232 3233 // Ignore direct virtual bases. 3234 if (DirectVirtualBases.count(RT)) 3235 continue; 3236 3237 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3238 // If our base class is invalid, we probably can't get its dtor anyway. 3239 if (BaseClassDecl->isInvalidDecl()) 3240 continue; 3241 // Ignore trivial destructors. 3242 if (BaseClassDecl->hasTrivialDestructor()) 3243 continue; 3244 3245 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3246 assert(Dtor && "No dtor found for BaseClassDecl!"); 3247 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3248 PDiag(diag::err_access_dtor_vbase) 3249 << VBase->getType()); 3250 3251 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3252 } 3253} 3254 3255void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3256 if (!CDtorDecl) 3257 return; 3258 3259 if (CXXConstructorDecl *Constructor 3260 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3261 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3262} 3263 3264bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3265 unsigned DiagID, AbstractDiagSelID SelID) { 3266 if (SelID == -1) 3267 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3268 else 3269 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3270} 3271 3272bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3273 const PartialDiagnostic &PD) { 3274 if (!getLangOptions().CPlusPlus) 3275 return false; 3276 3277 if (const ArrayType *AT = Context.getAsArrayType(T)) 3278 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3279 3280 if (const PointerType *PT = T->getAs<PointerType>()) { 3281 // Find the innermost pointer type. 3282 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3283 PT = T; 3284 3285 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3286 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3287 } 3288 3289 const RecordType *RT = T->getAs<RecordType>(); 3290 if (!RT) 3291 return false; 3292 3293 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3294 3295 // We can't answer whether something is abstract until it has a 3296 // definition. If it's currently being defined, we'll walk back 3297 // over all the declarations when we have a full definition. 3298 const CXXRecordDecl *Def = RD->getDefinition(); 3299 if (!Def || Def->isBeingDefined()) 3300 return false; 3301 3302 if (!RD->isAbstract()) 3303 return false; 3304 3305 Diag(Loc, PD) << RD->getDeclName(); 3306 DiagnoseAbstractType(RD); 3307 3308 return true; 3309} 3310 3311void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3312 // Check if we've already emitted the list of pure virtual functions 3313 // for this class. 3314 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3315 return; 3316 3317 CXXFinalOverriderMap FinalOverriders; 3318 RD->getFinalOverriders(FinalOverriders); 3319 3320 // Keep a set of seen pure methods so we won't diagnose the same method 3321 // more than once. 3322 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3323 3324 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3325 MEnd = FinalOverriders.end(); 3326 M != MEnd; 3327 ++M) { 3328 for (OverridingMethods::iterator SO = M->second.begin(), 3329 SOEnd = M->second.end(); 3330 SO != SOEnd; ++SO) { 3331 // C++ [class.abstract]p4: 3332 // A class is abstract if it contains or inherits at least one 3333 // pure virtual function for which the final overrider is pure 3334 // virtual. 3335 3336 // 3337 if (SO->second.size() != 1) 3338 continue; 3339 3340 if (!SO->second.front().Method->isPure()) 3341 continue; 3342 3343 if (!SeenPureMethods.insert(SO->second.front().Method)) 3344 continue; 3345 3346 Diag(SO->second.front().Method->getLocation(), 3347 diag::note_pure_virtual_function) 3348 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3349 } 3350 } 3351 3352 if (!PureVirtualClassDiagSet) 3353 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3354 PureVirtualClassDiagSet->insert(RD); 3355} 3356 3357namespace { 3358struct AbstractUsageInfo { 3359 Sema &S; 3360 CXXRecordDecl *Record; 3361 CanQualType AbstractType; 3362 bool Invalid; 3363 3364 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3365 : S(S), Record(Record), 3366 AbstractType(S.Context.getCanonicalType( 3367 S.Context.getTypeDeclType(Record))), 3368 Invalid(false) {} 3369 3370 void DiagnoseAbstractType() { 3371 if (Invalid) return; 3372 S.DiagnoseAbstractType(Record); 3373 Invalid = true; 3374 } 3375 3376 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3377}; 3378 3379struct CheckAbstractUsage { 3380 AbstractUsageInfo &Info; 3381 const NamedDecl *Ctx; 3382 3383 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3384 : Info(Info), Ctx(Ctx) {} 3385 3386 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3387 switch (TL.getTypeLocClass()) { 3388#define ABSTRACT_TYPELOC(CLASS, PARENT) 3389#define TYPELOC(CLASS, PARENT) \ 3390 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3391#include "clang/AST/TypeLocNodes.def" 3392 } 3393 } 3394 3395 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3396 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3397 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3398 if (!TL.getArg(I)) 3399 continue; 3400 3401 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3402 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3403 } 3404 } 3405 3406 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3407 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3408 } 3409 3410 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3411 // Visit the type parameters from a permissive context. 3412 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3413 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3414 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3415 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3416 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3417 // TODO: other template argument types? 3418 } 3419 } 3420 3421 // Visit pointee types from a permissive context. 3422#define CheckPolymorphic(Type) \ 3423 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3424 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3425 } 3426 CheckPolymorphic(PointerTypeLoc) 3427 CheckPolymorphic(ReferenceTypeLoc) 3428 CheckPolymorphic(MemberPointerTypeLoc) 3429 CheckPolymorphic(BlockPointerTypeLoc) 3430 CheckPolymorphic(AtomicTypeLoc) 3431 3432 /// Handle all the types we haven't given a more specific 3433 /// implementation for above. 3434 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3435 // Every other kind of type that we haven't called out already 3436 // that has an inner type is either (1) sugar or (2) contains that 3437 // inner type in some way as a subobject. 3438 if (TypeLoc Next = TL.getNextTypeLoc()) 3439 return Visit(Next, Sel); 3440 3441 // If there's no inner type and we're in a permissive context, 3442 // don't diagnose. 3443 if (Sel == Sema::AbstractNone) return; 3444 3445 // Check whether the type matches the abstract type. 3446 QualType T = TL.getType(); 3447 if (T->isArrayType()) { 3448 Sel = Sema::AbstractArrayType; 3449 T = Info.S.Context.getBaseElementType(T); 3450 } 3451 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3452 if (CT != Info.AbstractType) return; 3453 3454 // It matched; do some magic. 3455 if (Sel == Sema::AbstractArrayType) { 3456 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3457 << T << TL.getSourceRange(); 3458 } else { 3459 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3460 << Sel << T << TL.getSourceRange(); 3461 } 3462 Info.DiagnoseAbstractType(); 3463 } 3464}; 3465 3466void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3467 Sema::AbstractDiagSelID Sel) { 3468 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3469} 3470 3471} 3472 3473/// Check for invalid uses of an abstract type in a method declaration. 3474static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3475 CXXMethodDecl *MD) { 3476 // No need to do the check on definitions, which require that 3477 // the return/param types be complete. 3478 if (MD->doesThisDeclarationHaveABody()) 3479 return; 3480 3481 // For safety's sake, just ignore it if we don't have type source 3482 // information. This should never happen for non-implicit methods, 3483 // but... 3484 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3485 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3486} 3487 3488/// Check for invalid uses of an abstract type within a class definition. 3489static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3490 CXXRecordDecl *RD) { 3491 for (CXXRecordDecl::decl_iterator 3492 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3493 Decl *D = *I; 3494 if (D->isImplicit()) continue; 3495 3496 // Methods and method templates. 3497 if (isa<CXXMethodDecl>(D)) { 3498 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3499 } else if (isa<FunctionTemplateDecl>(D)) { 3500 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3501 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3502 3503 // Fields and static variables. 3504 } else if (isa<FieldDecl>(D)) { 3505 FieldDecl *FD = cast<FieldDecl>(D); 3506 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3507 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3508 } else if (isa<VarDecl>(D)) { 3509 VarDecl *VD = cast<VarDecl>(D); 3510 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3511 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3512 3513 // Nested classes and class templates. 3514 } else if (isa<CXXRecordDecl>(D)) { 3515 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3516 } else if (isa<ClassTemplateDecl>(D)) { 3517 CheckAbstractClassUsage(Info, 3518 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3519 } 3520 } 3521} 3522 3523/// \brief Perform semantic checks on a class definition that has been 3524/// completing, introducing implicitly-declared members, checking for 3525/// abstract types, etc. 3526void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3527 if (!Record) 3528 return; 3529 3530 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3531 AbstractUsageInfo Info(*this, Record); 3532 CheckAbstractClassUsage(Info, Record); 3533 } 3534 3535 // If this is not an aggregate type and has no user-declared constructor, 3536 // complain about any non-static data members of reference or const scalar 3537 // type, since they will never get initializers. 3538 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3539 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3540 bool Complained = false; 3541 for (RecordDecl::field_iterator F = Record->field_begin(), 3542 FEnd = Record->field_end(); 3543 F != FEnd; ++F) { 3544 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3545 continue; 3546 3547 if (F->getType()->isReferenceType() || 3548 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3549 if (!Complained) { 3550 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3551 << Record->getTagKind() << Record; 3552 Complained = true; 3553 } 3554 3555 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3556 << F->getType()->isReferenceType() 3557 << F->getDeclName(); 3558 } 3559 } 3560 } 3561 3562 if (Record->isDynamicClass() && !Record->isDependentType()) 3563 DynamicClasses.push_back(Record); 3564 3565 if (Record->getIdentifier()) { 3566 // C++ [class.mem]p13: 3567 // If T is the name of a class, then each of the following shall have a 3568 // name different from T: 3569 // - every member of every anonymous union that is a member of class T. 3570 // 3571 // C++ [class.mem]p14: 3572 // In addition, if class T has a user-declared constructor (12.1), every 3573 // non-static data member of class T shall have a name different from T. 3574 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3575 R.first != R.second; ++R.first) { 3576 NamedDecl *D = *R.first; 3577 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3578 isa<IndirectFieldDecl>(D)) { 3579 Diag(D->getLocation(), diag::err_member_name_of_class) 3580 << D->getDeclName(); 3581 break; 3582 } 3583 } 3584 } 3585 3586 // Warn if the class has virtual methods but non-virtual public destructor. 3587 if (Record->isPolymorphic() && !Record->isDependentType()) { 3588 CXXDestructorDecl *dtor = Record->getDestructor(); 3589 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3590 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3591 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3592 } 3593 3594 // See if a method overloads virtual methods in a base 3595 /// class without overriding any. 3596 if (!Record->isDependentType()) { 3597 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3598 MEnd = Record->method_end(); 3599 M != MEnd; ++M) { 3600 if (!(*M)->isStatic()) 3601 DiagnoseHiddenVirtualMethods(Record, *M); 3602 } 3603 } 3604 3605 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3606 // function that is not a constructor declares that member function to be 3607 // const. [...] The class of which that function is a member shall be 3608 // a literal type. 3609 // 3610 // It's fine to diagnose constructors here too: such constructors cannot 3611 // produce a constant expression, so are ill-formed (no diagnostic required). 3612 // 3613 // If the class has virtual bases, any constexpr members will already have 3614 // been diagnosed by the checks performed on the member declaration, so 3615 // suppress this (less useful) diagnostic. 3616 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3617 !Record->isLiteral() && !Record->getNumVBases()) { 3618 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3619 MEnd = Record->method_end(); 3620 M != MEnd; ++M) { 3621 if ((*M)->isConstexpr()) { 3622 switch (Record->getTemplateSpecializationKind()) { 3623 case TSK_ImplicitInstantiation: 3624 case TSK_ExplicitInstantiationDeclaration: 3625 case TSK_ExplicitInstantiationDefinition: 3626 // If a template instantiates to a non-literal type, but its members 3627 // instantiate to constexpr functions, the template is technically 3628 // ill-formed, but we allow it for sanity. Such members are treated as 3629 // non-constexpr. 3630 (*M)->setConstexpr(false); 3631 continue; 3632 3633 case TSK_Undeclared: 3634 case TSK_ExplicitSpecialization: 3635 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3636 PDiag(diag::err_constexpr_method_non_literal)); 3637 break; 3638 } 3639 3640 // Only produce one error per class. 3641 break; 3642 } 3643 } 3644 } 3645 3646 // Declare inherited constructors. We do this eagerly here because: 3647 // - The standard requires an eager diagnostic for conflicting inherited 3648 // constructors from different classes. 3649 // - The lazy declaration of the other implicit constructors is so as to not 3650 // waste space and performance on classes that are not meant to be 3651 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3652 // have inherited constructors. 3653 DeclareInheritedConstructors(Record); 3654 3655 if (!Record->isDependentType()) 3656 CheckExplicitlyDefaultedMethods(Record); 3657} 3658 3659void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3660 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3661 ME = Record->method_end(); 3662 MI != ME; ++MI) { 3663 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3664 switch (getSpecialMember(*MI)) { 3665 case CXXDefaultConstructor: 3666 CheckExplicitlyDefaultedDefaultConstructor( 3667 cast<CXXConstructorDecl>(*MI)); 3668 break; 3669 3670 case CXXDestructor: 3671 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3672 break; 3673 3674 case CXXCopyConstructor: 3675 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3676 break; 3677 3678 case CXXCopyAssignment: 3679 CheckExplicitlyDefaultedCopyAssignment(*MI); 3680 break; 3681 3682 case CXXMoveConstructor: 3683 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3684 break; 3685 3686 case CXXMoveAssignment: 3687 CheckExplicitlyDefaultedMoveAssignment(*MI); 3688 break; 3689 3690 case CXXInvalid: 3691 llvm_unreachable("non-special member explicitly defaulted!"); 3692 } 3693 } 3694 } 3695 3696} 3697 3698void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3699 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3700 3701 // Whether this was the first-declared instance of the constructor. 3702 // This affects whether we implicitly add an exception spec (and, eventually, 3703 // constexpr). It is also ill-formed to explicitly default a constructor such 3704 // that it would be deleted. (C++0x [decl.fct.def.default]) 3705 bool First = CD == CD->getCanonicalDecl(); 3706 3707 bool HadError = false; 3708 if (CD->getNumParams() != 0) { 3709 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3710 << CD->getSourceRange(); 3711 HadError = true; 3712 } 3713 3714 ImplicitExceptionSpecification Spec 3715 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3716 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3717 if (EPI.ExceptionSpecType == EST_Delayed) { 3718 // Exception specification depends on some deferred part of the class. We'll 3719 // try again when the class's definition has been fully processed. 3720 return; 3721 } 3722 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3723 *ExceptionType = Context.getFunctionType( 3724 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3725 3726 if (CtorType->hasExceptionSpec()) { 3727 if (CheckEquivalentExceptionSpec( 3728 PDiag(diag::err_incorrect_defaulted_exception_spec) 3729 << CXXDefaultConstructor, 3730 PDiag(), 3731 ExceptionType, SourceLocation(), 3732 CtorType, CD->getLocation())) { 3733 HadError = true; 3734 } 3735 } else if (First) { 3736 // We set the declaration to have the computed exception spec here. 3737 // We know there are no parameters. 3738 EPI.ExtInfo = CtorType->getExtInfo(); 3739 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3740 } 3741 3742 if (HadError) { 3743 CD->setInvalidDecl(); 3744 return; 3745 } 3746 3747 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3748 if (First) { 3749 CD->setDeletedAsWritten(); 3750 } else { 3751 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3752 << CXXDefaultConstructor; 3753 CD->setInvalidDecl(); 3754 } 3755 } 3756} 3757 3758void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3759 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3760 3761 // Whether this was the first-declared instance of the constructor. 3762 bool First = CD == CD->getCanonicalDecl(); 3763 3764 bool HadError = false; 3765 if (CD->getNumParams() != 1) { 3766 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3767 << CD->getSourceRange(); 3768 HadError = true; 3769 } 3770 3771 ImplicitExceptionSpecification Spec(Context); 3772 bool Const; 3773 llvm::tie(Spec, Const) = 3774 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3775 3776 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3777 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3778 *ExceptionType = Context.getFunctionType( 3779 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3780 3781 // Check for parameter type matching. 3782 // This is a copy ctor so we know it's a cv-qualified reference to T. 3783 QualType ArgType = CtorType->getArgType(0); 3784 if (ArgType->getPointeeType().isVolatileQualified()) { 3785 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3786 HadError = true; 3787 } 3788 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3789 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3790 HadError = true; 3791 } 3792 3793 if (CtorType->hasExceptionSpec()) { 3794 if (CheckEquivalentExceptionSpec( 3795 PDiag(diag::err_incorrect_defaulted_exception_spec) 3796 << CXXCopyConstructor, 3797 PDiag(), 3798 ExceptionType, SourceLocation(), 3799 CtorType, CD->getLocation())) { 3800 HadError = true; 3801 } 3802 } else if (First) { 3803 // We set the declaration to have the computed exception spec here. 3804 // We duplicate the one parameter type. 3805 EPI.ExtInfo = CtorType->getExtInfo(); 3806 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3807 } 3808 3809 if (HadError) { 3810 CD->setInvalidDecl(); 3811 return; 3812 } 3813 3814 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3815 if (First) { 3816 CD->setDeletedAsWritten(); 3817 } else { 3818 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3819 << CXXCopyConstructor; 3820 CD->setInvalidDecl(); 3821 } 3822 } 3823} 3824 3825void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3826 assert(MD->isExplicitlyDefaulted()); 3827 3828 // Whether this was the first-declared instance of the operator 3829 bool First = MD == MD->getCanonicalDecl(); 3830 3831 bool HadError = false; 3832 if (MD->getNumParams() != 1) { 3833 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3834 << MD->getSourceRange(); 3835 HadError = true; 3836 } 3837 3838 QualType ReturnType = 3839 MD->getType()->getAs<FunctionType>()->getResultType(); 3840 if (!ReturnType->isLValueReferenceType() || 3841 !Context.hasSameType( 3842 Context.getCanonicalType(ReturnType->getPointeeType()), 3843 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3844 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3845 HadError = true; 3846 } 3847 3848 ImplicitExceptionSpecification Spec(Context); 3849 bool Const; 3850 llvm::tie(Spec, Const) = 3851 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3852 3853 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3854 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3855 *ExceptionType = Context.getFunctionType( 3856 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3857 3858 QualType ArgType = OperType->getArgType(0); 3859 if (!ArgType->isLValueReferenceType()) { 3860 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3861 HadError = true; 3862 } else { 3863 if (ArgType->getPointeeType().isVolatileQualified()) { 3864 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3865 HadError = true; 3866 } 3867 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3868 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3869 HadError = true; 3870 } 3871 } 3872 3873 if (OperType->getTypeQuals()) { 3874 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3875 HadError = true; 3876 } 3877 3878 if (OperType->hasExceptionSpec()) { 3879 if (CheckEquivalentExceptionSpec( 3880 PDiag(diag::err_incorrect_defaulted_exception_spec) 3881 << CXXCopyAssignment, 3882 PDiag(), 3883 ExceptionType, SourceLocation(), 3884 OperType, MD->getLocation())) { 3885 HadError = true; 3886 } 3887 } else if (First) { 3888 // We set the declaration to have the computed exception spec here. 3889 // We duplicate the one parameter type. 3890 EPI.RefQualifier = OperType->getRefQualifier(); 3891 EPI.ExtInfo = OperType->getExtInfo(); 3892 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3893 } 3894 3895 if (HadError) { 3896 MD->setInvalidDecl(); 3897 return; 3898 } 3899 3900 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3901 if (First) { 3902 MD->setDeletedAsWritten(); 3903 } else { 3904 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3905 << CXXCopyAssignment; 3906 MD->setInvalidDecl(); 3907 } 3908 } 3909} 3910 3911void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3912 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3913 3914 // Whether this was the first-declared instance of the constructor. 3915 bool First = CD == CD->getCanonicalDecl(); 3916 3917 bool HadError = false; 3918 if (CD->getNumParams() != 1) { 3919 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3920 << CD->getSourceRange(); 3921 HadError = true; 3922 } 3923 3924 ImplicitExceptionSpecification Spec( 3925 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3926 3927 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3928 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3929 *ExceptionType = Context.getFunctionType( 3930 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3931 3932 // Check for parameter type matching. 3933 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3934 QualType ArgType = CtorType->getArgType(0); 3935 if (ArgType->getPointeeType().isVolatileQualified()) { 3936 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3937 HadError = true; 3938 } 3939 if (ArgType->getPointeeType().isConstQualified()) { 3940 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3941 HadError = true; 3942 } 3943 3944 if (CtorType->hasExceptionSpec()) { 3945 if (CheckEquivalentExceptionSpec( 3946 PDiag(diag::err_incorrect_defaulted_exception_spec) 3947 << CXXMoveConstructor, 3948 PDiag(), 3949 ExceptionType, SourceLocation(), 3950 CtorType, CD->getLocation())) { 3951 HadError = true; 3952 } 3953 } else if (First) { 3954 // We set the declaration to have the computed exception spec here. 3955 // We duplicate the one parameter type. 3956 EPI.ExtInfo = CtorType->getExtInfo(); 3957 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3958 } 3959 3960 if (HadError) { 3961 CD->setInvalidDecl(); 3962 return; 3963 } 3964 3965 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3966 if (First) { 3967 CD->setDeletedAsWritten(); 3968 } else { 3969 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3970 << CXXMoveConstructor; 3971 CD->setInvalidDecl(); 3972 } 3973 } 3974} 3975 3976void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3977 assert(MD->isExplicitlyDefaulted()); 3978 3979 // Whether this was the first-declared instance of the operator 3980 bool First = MD == MD->getCanonicalDecl(); 3981 3982 bool HadError = false; 3983 if (MD->getNumParams() != 1) { 3984 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3985 << MD->getSourceRange(); 3986 HadError = true; 3987 } 3988 3989 QualType ReturnType = 3990 MD->getType()->getAs<FunctionType>()->getResultType(); 3991 if (!ReturnType->isLValueReferenceType() || 3992 !Context.hasSameType( 3993 Context.getCanonicalType(ReturnType->getPointeeType()), 3994 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3995 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3996 HadError = true; 3997 } 3998 3999 ImplicitExceptionSpecification Spec( 4000 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4001 4002 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4003 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4004 *ExceptionType = Context.getFunctionType( 4005 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4006 4007 QualType ArgType = OperType->getArgType(0); 4008 if (!ArgType->isRValueReferenceType()) { 4009 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4010 HadError = true; 4011 } else { 4012 if (ArgType->getPointeeType().isVolatileQualified()) { 4013 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4014 HadError = true; 4015 } 4016 if (ArgType->getPointeeType().isConstQualified()) { 4017 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4018 HadError = true; 4019 } 4020 } 4021 4022 if (OperType->getTypeQuals()) { 4023 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4024 HadError = true; 4025 } 4026 4027 if (OperType->hasExceptionSpec()) { 4028 if (CheckEquivalentExceptionSpec( 4029 PDiag(diag::err_incorrect_defaulted_exception_spec) 4030 << CXXMoveAssignment, 4031 PDiag(), 4032 ExceptionType, SourceLocation(), 4033 OperType, MD->getLocation())) { 4034 HadError = true; 4035 } 4036 } else if (First) { 4037 // We set the declaration to have the computed exception spec here. 4038 // We duplicate the one parameter type. 4039 EPI.RefQualifier = OperType->getRefQualifier(); 4040 EPI.ExtInfo = OperType->getExtInfo(); 4041 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4042 } 4043 4044 if (HadError) { 4045 MD->setInvalidDecl(); 4046 return; 4047 } 4048 4049 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4050 if (First) { 4051 MD->setDeletedAsWritten(); 4052 } else { 4053 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4054 << CXXMoveAssignment; 4055 MD->setInvalidDecl(); 4056 } 4057 } 4058} 4059 4060void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4061 assert(DD->isExplicitlyDefaulted()); 4062 4063 // Whether this was the first-declared instance of the destructor. 4064 bool First = DD == DD->getCanonicalDecl(); 4065 4066 ImplicitExceptionSpecification Spec 4067 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4068 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4069 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4070 *ExceptionType = Context.getFunctionType( 4071 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4072 4073 if (DtorType->hasExceptionSpec()) { 4074 if (CheckEquivalentExceptionSpec( 4075 PDiag(diag::err_incorrect_defaulted_exception_spec) 4076 << CXXDestructor, 4077 PDiag(), 4078 ExceptionType, SourceLocation(), 4079 DtorType, DD->getLocation())) { 4080 DD->setInvalidDecl(); 4081 return; 4082 } 4083 } else if (First) { 4084 // We set the declaration to have the computed exception spec here. 4085 // There are no parameters. 4086 EPI.ExtInfo = DtorType->getExtInfo(); 4087 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4088 } 4089 4090 if (ShouldDeleteDestructor(DD)) { 4091 if (First) { 4092 DD->setDeletedAsWritten(); 4093 } else { 4094 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4095 << CXXDestructor; 4096 DD->setInvalidDecl(); 4097 } 4098 } 4099} 4100 4101/// This function implements the following C++0x paragraphs: 4102/// - [class.ctor]/5 4103/// - [class.copy]/11 4104bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4105 assert(!MD->isInvalidDecl()); 4106 CXXRecordDecl *RD = MD->getParent(); 4107 assert(!RD->isDependentType() && "do deletion after instantiation"); 4108 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4109 return false; 4110 4111 bool IsUnion = RD->isUnion(); 4112 bool IsConstructor = false; 4113 bool IsAssignment = false; 4114 bool IsMove = false; 4115 4116 bool ConstArg = false; 4117 4118 switch (CSM) { 4119 case CXXDefaultConstructor: 4120 IsConstructor = true; 4121 break; 4122 case CXXCopyConstructor: 4123 IsConstructor = true; 4124 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4125 break; 4126 case CXXMoveConstructor: 4127 IsConstructor = true; 4128 IsMove = true; 4129 break; 4130 default: 4131 llvm_unreachable("function only currently implemented for default ctors"); 4132 } 4133 4134 SourceLocation Loc = MD->getLocation(); 4135 4136 // Do access control from the special member function 4137 ContextRAII MethodContext(*this, MD); 4138 4139 bool AllConst = true; 4140 4141 // We do this because we should never actually use an anonymous 4142 // union's constructor. 4143 if (IsUnion && RD->isAnonymousStructOrUnion()) 4144 return false; 4145 4146 // FIXME: We should put some diagnostic logic right into this function. 4147 4148 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4149 BE = RD->bases_end(); 4150 BI != BE; ++BI) { 4151 // We'll handle this one later 4152 if (BI->isVirtual()) 4153 continue; 4154 4155 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4156 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4157 4158 // Unless we have an assignment operator, the base's destructor must 4159 // be accessible and not deleted. 4160 if (!IsAssignment) { 4161 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4162 if (BaseDtor->isDeleted()) 4163 return true; 4164 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4165 AR_accessible) 4166 return true; 4167 } 4168 4169 // Finding the corresponding member in the base should lead to a 4170 // unique, accessible, non-deleted function. If we are doing 4171 // a destructor, we have already checked this case. 4172 if (CSM != CXXDestructor) { 4173 SpecialMemberOverloadResult *SMOR = 4174 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4175 false); 4176 if (!SMOR->hasSuccess()) 4177 return true; 4178 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4179 if (IsConstructor) { 4180 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4181 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4182 PDiag()) != AR_accessible) 4183 return true; 4184 4185 // For a move operation, the corresponding operation must actually 4186 // be a move operation (and not a copy selected by overload 4187 // resolution) unless we are working on a trivially copyable class. 4188 if (IsMove && !BaseCtor->isMoveConstructor() && 4189 !BaseDecl->isTriviallyCopyable()) 4190 return true; 4191 } 4192 } 4193 } 4194 4195 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4196 BE = RD->vbases_end(); 4197 BI != BE; ++BI) { 4198 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4199 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4200 4201 // Unless we have an assignment operator, the base's destructor must 4202 // be accessible and not deleted. 4203 if (!IsAssignment) { 4204 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4205 if (BaseDtor->isDeleted()) 4206 return true; 4207 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4208 AR_accessible) 4209 return true; 4210 } 4211 4212 // Finding the corresponding member in the base should lead to a 4213 // unique, accessible, non-deleted function. 4214 if (CSM != CXXDestructor) { 4215 SpecialMemberOverloadResult *SMOR = 4216 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4217 false); 4218 if (!SMOR->hasSuccess()) 4219 return true; 4220 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4221 if (IsConstructor) { 4222 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4223 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4224 PDiag()) != AR_accessible) 4225 return true; 4226 4227 // For a move operation, the corresponding operation must actually 4228 // be a move operation (and not a copy selected by overload 4229 // resolution) unless we are working on a trivially copyable class. 4230 if (IsMove && !BaseCtor->isMoveConstructor() && 4231 !BaseDecl->isTriviallyCopyable()) 4232 return true; 4233 } 4234 } 4235 } 4236 4237 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4238 FE = RD->field_end(); 4239 FI != FE; ++FI) { 4240 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4241 continue; 4242 4243 QualType FieldType = Context.getBaseElementType(FI->getType()); 4244 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4245 4246 // For a default constructor, all references must be initialized in-class 4247 // and, if a union, it must have a non-const member. 4248 if (CSM == CXXDefaultConstructor) { 4249 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4250 return true; 4251 4252 if (IsUnion && !FieldType.isConstQualified()) 4253 AllConst = false; 4254 // For a copy constructor, data members must not be of rvalue reference 4255 // type. 4256 } else if (CSM == CXXCopyConstructor) { 4257 if (FieldType->isRValueReferenceType()) 4258 return true; 4259 } 4260 4261 if (FieldRecord) { 4262 // For a default constructor, a const member must have a user-provided 4263 // default constructor or else be explicitly initialized. 4264 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4265 !FI->hasInClassInitializer() && 4266 !FieldRecord->hasUserProvidedDefaultConstructor()) 4267 return true; 4268 4269 // Some additional restrictions exist on the variant members. 4270 if (!IsUnion && FieldRecord->isUnion() && 4271 FieldRecord->isAnonymousStructOrUnion()) { 4272 // We're okay to reuse AllConst here since we only care about the 4273 // value otherwise if we're in a union. 4274 AllConst = true; 4275 4276 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4277 UE = FieldRecord->field_end(); 4278 UI != UE; ++UI) { 4279 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4280 CXXRecordDecl *UnionFieldRecord = 4281 UnionFieldType->getAsCXXRecordDecl(); 4282 4283 if (!UnionFieldType.isConstQualified()) 4284 AllConst = false; 4285 4286 if (UnionFieldRecord) { 4287 // FIXME: Checking for accessibility and validity of this 4288 // destructor is technically going beyond the 4289 // standard, but this is believed to be a defect. 4290 if (!IsAssignment) { 4291 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4292 if (FieldDtor->isDeleted()) 4293 return true; 4294 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4295 AR_accessible) 4296 return true; 4297 if (!FieldDtor->isTrivial()) 4298 return true; 4299 } 4300 4301 if (CSM != CXXDestructor) { 4302 SpecialMemberOverloadResult *SMOR = 4303 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4304 false, false, false); 4305 // FIXME: Checking for accessibility and validity of this 4306 // corresponding member is technically going beyond the 4307 // standard, but this is believed to be a defect. 4308 if (!SMOR->hasSuccess()) 4309 return true; 4310 4311 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4312 // A member of a union must have a trivial corresponding 4313 // constructor. 4314 if (!FieldMember->isTrivial()) 4315 return true; 4316 4317 if (IsConstructor) { 4318 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4319 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4320 PDiag()) != AR_accessible) 4321 return true; 4322 } 4323 } 4324 } 4325 } 4326 4327 // At least one member in each anonymous union must be non-const 4328 if (CSM == CXXDefaultConstructor && AllConst) 4329 return true; 4330 4331 // Don't try to initialize the anonymous union 4332 // This is technically non-conformant, but sanity demands it. 4333 continue; 4334 } 4335 4336 // Unless we're doing assignment, the field's destructor must be 4337 // accessible and not deleted. 4338 if (!IsAssignment) { 4339 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4340 if (FieldDtor->isDeleted()) 4341 return true; 4342 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4343 AR_accessible) 4344 return true; 4345 } 4346 4347 // Check that the corresponding member of the field is accessible, 4348 // unique, and non-deleted. We don't do this if it has an explicit 4349 // initialization when default-constructing. 4350 if (CSM != CXXDestructor && 4351 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4352 SpecialMemberOverloadResult *SMOR = 4353 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4354 false); 4355 if (!SMOR->hasSuccess()) 4356 return true; 4357 4358 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4359 if (IsConstructor) { 4360 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4361 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4362 PDiag()) != AR_accessible) 4363 return true; 4364 4365 // For a move operation, the corresponding operation must actually 4366 // be a move operation (and not a copy selected by overload 4367 // resolution) unless we are working on a trivially copyable class. 4368 if (IsMove && !FieldCtor->isMoveConstructor() && 4369 !FieldRecord->isTriviallyCopyable()) 4370 return true; 4371 } 4372 4373 // We need the corresponding member of a union to be trivial so that 4374 // we can safely copy them all simultaneously. 4375 // FIXME: Note that performing the check here (where we rely on the lack 4376 // of an in-class initializer) is technically ill-formed. However, this 4377 // seems most obviously to be a bug in the standard. 4378 if (IsUnion && !FieldMember->isTrivial()) 4379 return true; 4380 } 4381 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4382 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4383 // We can't initialize a const member of non-class type to any value. 4384 return true; 4385 } 4386 } 4387 4388 // We can't have all const members in a union when default-constructing, 4389 // or else they're all nonsensical garbage values that can't be changed. 4390 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4391 return true; 4392 4393 return false; 4394} 4395 4396bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4397 CXXRecordDecl *RD = MD->getParent(); 4398 assert(!RD->isDependentType() && "do deletion after instantiation"); 4399 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4400 return false; 4401 4402 SourceLocation Loc = MD->getLocation(); 4403 4404 // Do access control from the constructor 4405 ContextRAII MethodContext(*this, MD); 4406 4407 bool Union = RD->isUnion(); 4408 4409 unsigned ArgQuals = 4410 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4411 Qualifiers::Const : 0; 4412 4413 // We do this because we should never actually use an anonymous 4414 // union's constructor. 4415 if (Union && RD->isAnonymousStructOrUnion()) 4416 return false; 4417 4418 // FIXME: We should put some diagnostic logic right into this function. 4419 4420 // C++0x [class.copy]/20 4421 // A defaulted [copy] assignment operator for class X is defined as deleted 4422 // if X has: 4423 4424 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4425 BE = RD->bases_end(); 4426 BI != BE; ++BI) { 4427 // We'll handle this one later 4428 if (BI->isVirtual()) 4429 continue; 4430 4431 QualType BaseType = BI->getType(); 4432 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4433 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4434 4435 // -- a [direct base class] B that cannot be [copied] because overload 4436 // resolution, as applied to B's [copy] assignment operator, results in 4437 // an ambiguity or a function that is deleted or inaccessible from the 4438 // assignment operator 4439 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4440 0); 4441 if (!CopyOper || CopyOper->isDeleted()) 4442 return true; 4443 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4444 return true; 4445 } 4446 4447 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4448 BE = RD->vbases_end(); 4449 BI != BE; ++BI) { 4450 QualType BaseType = BI->getType(); 4451 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4452 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4453 4454 // -- a [virtual base class] B that cannot be [copied] because overload 4455 // resolution, as applied to B's [copy] assignment operator, results in 4456 // an ambiguity or a function that is deleted or inaccessible from the 4457 // assignment operator 4458 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4459 0); 4460 if (!CopyOper || CopyOper->isDeleted()) 4461 return true; 4462 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4463 return true; 4464 } 4465 4466 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4467 FE = RD->field_end(); 4468 FI != FE; ++FI) { 4469 if (FI->isUnnamedBitfield()) 4470 continue; 4471 4472 QualType FieldType = Context.getBaseElementType(FI->getType()); 4473 4474 // -- a non-static data member of reference type 4475 if (FieldType->isReferenceType()) 4476 return true; 4477 4478 // -- a non-static data member of const non-class type (or array thereof) 4479 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4480 return true; 4481 4482 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4483 4484 if (FieldRecord) { 4485 // This is an anonymous union 4486 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4487 // Anonymous unions inside unions do not variant members create 4488 if (!Union) { 4489 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4490 UE = FieldRecord->field_end(); 4491 UI != UE; ++UI) { 4492 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4493 CXXRecordDecl *UnionFieldRecord = 4494 UnionFieldType->getAsCXXRecordDecl(); 4495 4496 // -- a variant member with a non-trivial [copy] assignment operator 4497 // and X is a union-like class 4498 if (UnionFieldRecord && 4499 !UnionFieldRecord->hasTrivialCopyAssignment()) 4500 return true; 4501 } 4502 } 4503 4504 // Don't try to initalize an anonymous union 4505 continue; 4506 // -- a variant member with a non-trivial [copy] assignment operator 4507 // and X is a union-like class 4508 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4509 return true; 4510 } 4511 4512 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4513 false, 0); 4514 if (!CopyOper || CopyOper->isDeleted()) 4515 return true; 4516 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4517 return true; 4518 } 4519 } 4520 4521 return false; 4522} 4523 4524bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4525 CXXRecordDecl *RD = MD->getParent(); 4526 assert(!RD->isDependentType() && "do deletion after instantiation"); 4527 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4528 return false; 4529 4530 SourceLocation Loc = MD->getLocation(); 4531 4532 // Do access control from the constructor 4533 ContextRAII MethodContext(*this, MD); 4534 4535 bool Union = RD->isUnion(); 4536 4537 // We do this because we should never actually use an anonymous 4538 // union's constructor. 4539 if (Union && RD->isAnonymousStructOrUnion()) 4540 return false; 4541 4542 // C++0x [class.copy]/20 4543 // A defaulted [move] assignment operator for class X is defined as deleted 4544 // if X has: 4545 4546 // -- for the move constructor, [...] any direct or indirect virtual base 4547 // class. 4548 if (RD->getNumVBases() != 0) 4549 return true; 4550 4551 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4552 BE = RD->bases_end(); 4553 BI != BE; ++BI) { 4554 4555 QualType BaseType = BI->getType(); 4556 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4557 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4558 4559 // -- a [direct base class] B that cannot be [moved] because overload 4560 // resolution, as applied to B's [move] assignment operator, results in 4561 // an ambiguity or a function that is deleted or inaccessible from the 4562 // assignment operator 4563 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4564 if (!MoveOper || MoveOper->isDeleted()) 4565 return true; 4566 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4567 return true; 4568 4569 // -- for the move assignment operator, a [direct base class] with a type 4570 // that does not have a move assignment operator and is not trivially 4571 // copyable. 4572 if (!MoveOper->isMoveAssignmentOperator() && 4573 !BaseDecl->isTriviallyCopyable()) 4574 return true; 4575 } 4576 4577 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4578 FE = RD->field_end(); 4579 FI != FE; ++FI) { 4580 if (FI->isUnnamedBitfield()) 4581 continue; 4582 4583 QualType FieldType = Context.getBaseElementType(FI->getType()); 4584 4585 // -- a non-static data member of reference type 4586 if (FieldType->isReferenceType()) 4587 return true; 4588 4589 // -- a non-static data member of const non-class type (or array thereof) 4590 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4591 return true; 4592 4593 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4594 4595 if (FieldRecord) { 4596 // This is an anonymous union 4597 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4598 // Anonymous unions inside unions do not variant members create 4599 if (!Union) { 4600 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4601 UE = FieldRecord->field_end(); 4602 UI != UE; ++UI) { 4603 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4604 CXXRecordDecl *UnionFieldRecord = 4605 UnionFieldType->getAsCXXRecordDecl(); 4606 4607 // -- a variant member with a non-trivial [move] assignment operator 4608 // and X is a union-like class 4609 if (UnionFieldRecord && 4610 !UnionFieldRecord->hasTrivialMoveAssignment()) 4611 return true; 4612 } 4613 } 4614 4615 // Don't try to initalize an anonymous union 4616 continue; 4617 // -- a variant member with a non-trivial [move] assignment operator 4618 // and X is a union-like class 4619 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4620 return true; 4621 } 4622 4623 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4624 if (!MoveOper || MoveOper->isDeleted()) 4625 return true; 4626 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4627 return true; 4628 4629 // -- for the move assignment operator, a [non-static data member] with a 4630 // type that does not have a move assignment operator and is not 4631 // trivially copyable. 4632 if (!MoveOper->isMoveAssignmentOperator() && 4633 !FieldRecord->isTriviallyCopyable()) 4634 return true; 4635 } 4636 } 4637 4638 return false; 4639} 4640 4641bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4642 CXXRecordDecl *RD = DD->getParent(); 4643 assert(!RD->isDependentType() && "do deletion after instantiation"); 4644 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4645 return false; 4646 4647 SourceLocation Loc = DD->getLocation(); 4648 4649 // Do access control from the destructor 4650 ContextRAII CtorContext(*this, DD); 4651 4652 bool Union = RD->isUnion(); 4653 4654 // We do this because we should never actually use an anonymous 4655 // union's destructor. 4656 if (Union && RD->isAnonymousStructOrUnion()) 4657 return false; 4658 4659 // C++0x [class.dtor]p5 4660 // A defaulted destructor for a class X is defined as deleted if: 4661 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4662 BE = RD->bases_end(); 4663 BI != BE; ++BI) { 4664 // We'll handle this one later 4665 if (BI->isVirtual()) 4666 continue; 4667 4668 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4669 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4670 assert(BaseDtor && "base has no destructor"); 4671 4672 // -- any direct or virtual base class has a deleted destructor or 4673 // a destructor that is inaccessible from the defaulted destructor 4674 if (BaseDtor->isDeleted()) 4675 return true; 4676 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4677 AR_accessible) 4678 return true; 4679 } 4680 4681 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4682 BE = RD->vbases_end(); 4683 BI != BE; ++BI) { 4684 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4685 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4686 assert(BaseDtor && "base has no destructor"); 4687 4688 // -- any direct or virtual base class has a deleted destructor or 4689 // a destructor that is inaccessible from the defaulted destructor 4690 if (BaseDtor->isDeleted()) 4691 return true; 4692 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4693 AR_accessible) 4694 return true; 4695 } 4696 4697 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4698 FE = RD->field_end(); 4699 FI != FE; ++FI) { 4700 QualType FieldType = Context.getBaseElementType(FI->getType()); 4701 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4702 if (FieldRecord) { 4703 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4704 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4705 UE = FieldRecord->field_end(); 4706 UI != UE; ++UI) { 4707 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4708 CXXRecordDecl *UnionFieldRecord = 4709 UnionFieldType->getAsCXXRecordDecl(); 4710 4711 // -- X is a union-like class that has a variant member with a non- 4712 // trivial destructor. 4713 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4714 return true; 4715 } 4716 // Technically we are supposed to do this next check unconditionally. 4717 // But that makes absolutely no sense. 4718 } else { 4719 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4720 4721 // -- any of the non-static data members has class type M (or array 4722 // thereof) and M has a deleted destructor or a destructor that is 4723 // inaccessible from the defaulted destructor 4724 if (FieldDtor->isDeleted()) 4725 return true; 4726 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4727 AR_accessible) 4728 return true; 4729 4730 // -- X is a union-like class that has a variant member with a non- 4731 // trivial destructor. 4732 if (Union && !FieldDtor->isTrivial()) 4733 return true; 4734 } 4735 } 4736 } 4737 4738 if (DD->isVirtual()) { 4739 FunctionDecl *OperatorDelete = 0; 4740 DeclarationName Name = 4741 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4742 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4743 false)) 4744 return true; 4745 } 4746 4747 4748 return false; 4749} 4750 4751/// \brief Data used with FindHiddenVirtualMethod 4752namespace { 4753 struct FindHiddenVirtualMethodData { 4754 Sema *S; 4755 CXXMethodDecl *Method; 4756 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4757 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4758 }; 4759} 4760 4761/// \brief Member lookup function that determines whether a given C++ 4762/// method overloads virtual methods in a base class without overriding any, 4763/// to be used with CXXRecordDecl::lookupInBases(). 4764static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4765 CXXBasePath &Path, 4766 void *UserData) { 4767 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4768 4769 FindHiddenVirtualMethodData &Data 4770 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4771 4772 DeclarationName Name = Data.Method->getDeclName(); 4773 assert(Name.getNameKind() == DeclarationName::Identifier); 4774 4775 bool foundSameNameMethod = false; 4776 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4777 for (Path.Decls = BaseRecord->lookup(Name); 4778 Path.Decls.first != Path.Decls.second; 4779 ++Path.Decls.first) { 4780 NamedDecl *D = *Path.Decls.first; 4781 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4782 MD = MD->getCanonicalDecl(); 4783 foundSameNameMethod = true; 4784 // Interested only in hidden virtual methods. 4785 if (!MD->isVirtual()) 4786 continue; 4787 // If the method we are checking overrides a method from its base 4788 // don't warn about the other overloaded methods. 4789 if (!Data.S->IsOverload(Data.Method, MD, false)) 4790 return true; 4791 // Collect the overload only if its hidden. 4792 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4793 overloadedMethods.push_back(MD); 4794 } 4795 } 4796 4797 if (foundSameNameMethod) 4798 Data.OverloadedMethods.append(overloadedMethods.begin(), 4799 overloadedMethods.end()); 4800 return foundSameNameMethod; 4801} 4802 4803/// \brief See if a method overloads virtual methods in a base class without 4804/// overriding any. 4805void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4806 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4807 MD->getLocation()) == DiagnosticsEngine::Ignored) 4808 return; 4809 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4810 return; 4811 4812 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4813 /*bool RecordPaths=*/false, 4814 /*bool DetectVirtual=*/false); 4815 FindHiddenVirtualMethodData Data; 4816 Data.Method = MD; 4817 Data.S = this; 4818 4819 // Keep the base methods that were overriden or introduced in the subclass 4820 // by 'using' in a set. A base method not in this set is hidden. 4821 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4822 res.first != res.second; ++res.first) { 4823 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4824 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4825 E = MD->end_overridden_methods(); 4826 I != E; ++I) 4827 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4828 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4829 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4830 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4831 } 4832 4833 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4834 !Data.OverloadedMethods.empty()) { 4835 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4836 << MD << (Data.OverloadedMethods.size() > 1); 4837 4838 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4839 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4840 Diag(overloadedMD->getLocation(), 4841 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4842 } 4843 } 4844} 4845 4846void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4847 Decl *TagDecl, 4848 SourceLocation LBrac, 4849 SourceLocation RBrac, 4850 AttributeList *AttrList) { 4851 if (!TagDecl) 4852 return; 4853 4854 AdjustDeclIfTemplate(TagDecl); 4855 4856 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4857 // strict aliasing violation! 4858 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4859 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4860 4861 CheckCompletedCXXClass( 4862 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4863} 4864 4865/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4866/// special functions, such as the default constructor, copy 4867/// constructor, or destructor, to the given C++ class (C++ 4868/// [special]p1). This routine can only be executed just before the 4869/// definition of the class is complete. 4870void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4871 if (!ClassDecl->hasUserDeclaredConstructor()) 4872 ++ASTContext::NumImplicitDefaultConstructors; 4873 4874 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4875 ++ASTContext::NumImplicitCopyConstructors; 4876 4877 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4878 ++ASTContext::NumImplicitCopyAssignmentOperators; 4879 4880 // If we have a dynamic class, then the copy assignment operator may be 4881 // virtual, so we have to declare it immediately. This ensures that, e.g., 4882 // it shows up in the right place in the vtable and that we diagnose 4883 // problems with the implicit exception specification. 4884 if (ClassDecl->isDynamicClass()) 4885 DeclareImplicitCopyAssignment(ClassDecl); 4886 } 4887 4888 if (!ClassDecl->hasUserDeclaredDestructor()) { 4889 ++ASTContext::NumImplicitDestructors; 4890 4891 // If we have a dynamic class, then the destructor may be virtual, so we 4892 // have to declare the destructor immediately. This ensures that, e.g., it 4893 // shows up in the right place in the vtable and that we diagnose problems 4894 // with the implicit exception specification. 4895 if (ClassDecl->isDynamicClass()) 4896 DeclareImplicitDestructor(ClassDecl); 4897 } 4898} 4899 4900void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4901 if (!D) 4902 return; 4903 4904 int NumParamList = D->getNumTemplateParameterLists(); 4905 for (int i = 0; i < NumParamList; i++) { 4906 TemplateParameterList* Params = D->getTemplateParameterList(i); 4907 for (TemplateParameterList::iterator Param = Params->begin(), 4908 ParamEnd = Params->end(); 4909 Param != ParamEnd; ++Param) { 4910 NamedDecl *Named = cast<NamedDecl>(*Param); 4911 if (Named->getDeclName()) { 4912 S->AddDecl(Named); 4913 IdResolver.AddDecl(Named); 4914 } 4915 } 4916 } 4917} 4918 4919void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4920 if (!D) 4921 return; 4922 4923 TemplateParameterList *Params = 0; 4924 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4925 Params = Template->getTemplateParameters(); 4926 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4927 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4928 Params = PartialSpec->getTemplateParameters(); 4929 else 4930 return; 4931 4932 for (TemplateParameterList::iterator Param = Params->begin(), 4933 ParamEnd = Params->end(); 4934 Param != ParamEnd; ++Param) { 4935 NamedDecl *Named = cast<NamedDecl>(*Param); 4936 if (Named->getDeclName()) { 4937 S->AddDecl(Named); 4938 IdResolver.AddDecl(Named); 4939 } 4940 } 4941} 4942 4943void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4944 if (!RecordD) return; 4945 AdjustDeclIfTemplate(RecordD); 4946 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4947 PushDeclContext(S, Record); 4948} 4949 4950void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4951 if (!RecordD) return; 4952 PopDeclContext(); 4953} 4954 4955/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4956/// parsing a top-level (non-nested) C++ class, and we are now 4957/// parsing those parts of the given Method declaration that could 4958/// not be parsed earlier (C++ [class.mem]p2), such as default 4959/// arguments. This action should enter the scope of the given 4960/// Method declaration as if we had just parsed the qualified method 4961/// name. However, it should not bring the parameters into scope; 4962/// that will be performed by ActOnDelayedCXXMethodParameter. 4963void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4964} 4965 4966/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4967/// C++ method declaration. We're (re-)introducing the given 4968/// function parameter into scope for use in parsing later parts of 4969/// the method declaration. For example, we could see an 4970/// ActOnParamDefaultArgument event for this parameter. 4971void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4972 if (!ParamD) 4973 return; 4974 4975 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4976 4977 // If this parameter has an unparsed default argument, clear it out 4978 // to make way for the parsed default argument. 4979 if (Param->hasUnparsedDefaultArg()) 4980 Param->setDefaultArg(0); 4981 4982 S->AddDecl(Param); 4983 if (Param->getDeclName()) 4984 IdResolver.AddDecl(Param); 4985} 4986 4987/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4988/// processing the delayed method declaration for Method. The method 4989/// declaration is now considered finished. There may be a separate 4990/// ActOnStartOfFunctionDef action later (not necessarily 4991/// immediately!) for this method, if it was also defined inside the 4992/// class body. 4993void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4994 if (!MethodD) 4995 return; 4996 4997 AdjustDeclIfTemplate(MethodD); 4998 4999 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5000 5001 // Now that we have our default arguments, check the constructor 5002 // again. It could produce additional diagnostics or affect whether 5003 // the class has implicitly-declared destructors, among other 5004 // things. 5005 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5006 CheckConstructor(Constructor); 5007 5008 // Check the default arguments, which we may have added. 5009 if (!Method->isInvalidDecl()) 5010 CheckCXXDefaultArguments(Method); 5011} 5012 5013/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5014/// the well-formedness of the constructor declarator @p D with type @p 5015/// R. If there are any errors in the declarator, this routine will 5016/// emit diagnostics and set the invalid bit to true. In any case, the type 5017/// will be updated to reflect a well-formed type for the constructor and 5018/// returned. 5019QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5020 StorageClass &SC) { 5021 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5022 5023 // C++ [class.ctor]p3: 5024 // A constructor shall not be virtual (10.3) or static (9.4). A 5025 // constructor can be invoked for a const, volatile or const 5026 // volatile object. A constructor shall not be declared const, 5027 // volatile, or const volatile (9.3.2). 5028 if (isVirtual) { 5029 if (!D.isInvalidType()) 5030 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5031 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5032 << SourceRange(D.getIdentifierLoc()); 5033 D.setInvalidType(); 5034 } 5035 if (SC == SC_Static) { 5036 if (!D.isInvalidType()) 5037 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5038 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5039 << SourceRange(D.getIdentifierLoc()); 5040 D.setInvalidType(); 5041 SC = SC_None; 5042 } 5043 5044 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5045 if (FTI.TypeQuals != 0) { 5046 if (FTI.TypeQuals & Qualifiers::Const) 5047 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5048 << "const" << SourceRange(D.getIdentifierLoc()); 5049 if (FTI.TypeQuals & Qualifiers::Volatile) 5050 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5051 << "volatile" << SourceRange(D.getIdentifierLoc()); 5052 if (FTI.TypeQuals & Qualifiers::Restrict) 5053 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5054 << "restrict" << SourceRange(D.getIdentifierLoc()); 5055 D.setInvalidType(); 5056 } 5057 5058 // C++0x [class.ctor]p4: 5059 // A constructor shall not be declared with a ref-qualifier. 5060 if (FTI.hasRefQualifier()) { 5061 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5062 << FTI.RefQualifierIsLValueRef 5063 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5064 D.setInvalidType(); 5065 } 5066 5067 // Rebuild the function type "R" without any type qualifiers (in 5068 // case any of the errors above fired) and with "void" as the 5069 // return type, since constructors don't have return types. 5070 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5071 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5072 return R; 5073 5074 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5075 EPI.TypeQuals = 0; 5076 EPI.RefQualifier = RQ_None; 5077 5078 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5079 Proto->getNumArgs(), EPI); 5080} 5081 5082/// CheckConstructor - Checks a fully-formed constructor for 5083/// well-formedness, issuing any diagnostics required. Returns true if 5084/// the constructor declarator is invalid. 5085void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5086 CXXRecordDecl *ClassDecl 5087 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5088 if (!ClassDecl) 5089 return Constructor->setInvalidDecl(); 5090 5091 // C++ [class.copy]p3: 5092 // A declaration of a constructor for a class X is ill-formed if 5093 // its first parameter is of type (optionally cv-qualified) X and 5094 // either there are no other parameters or else all other 5095 // parameters have default arguments. 5096 if (!Constructor->isInvalidDecl() && 5097 ((Constructor->getNumParams() == 1) || 5098 (Constructor->getNumParams() > 1 && 5099 Constructor->getParamDecl(1)->hasDefaultArg())) && 5100 Constructor->getTemplateSpecializationKind() 5101 != TSK_ImplicitInstantiation) { 5102 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5103 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5104 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5105 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5106 const char *ConstRef 5107 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5108 : " const &"; 5109 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5110 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5111 5112 // FIXME: Rather that making the constructor invalid, we should endeavor 5113 // to fix the type. 5114 Constructor->setInvalidDecl(); 5115 } 5116 } 5117} 5118 5119/// CheckDestructor - Checks a fully-formed destructor definition for 5120/// well-formedness, issuing any diagnostics required. Returns true 5121/// on error. 5122bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5123 CXXRecordDecl *RD = Destructor->getParent(); 5124 5125 if (Destructor->isVirtual()) { 5126 SourceLocation Loc; 5127 5128 if (!Destructor->isImplicit()) 5129 Loc = Destructor->getLocation(); 5130 else 5131 Loc = RD->getLocation(); 5132 5133 // If we have a virtual destructor, look up the deallocation function 5134 FunctionDecl *OperatorDelete = 0; 5135 DeclarationName Name = 5136 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5137 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5138 return true; 5139 5140 MarkDeclarationReferenced(Loc, OperatorDelete); 5141 5142 Destructor->setOperatorDelete(OperatorDelete); 5143 } 5144 5145 return false; 5146} 5147 5148static inline bool 5149FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5150 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5151 FTI.ArgInfo[0].Param && 5152 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5153} 5154 5155/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5156/// the well-formednes of the destructor declarator @p D with type @p 5157/// R. If there are any errors in the declarator, this routine will 5158/// emit diagnostics and set the declarator to invalid. Even if this happens, 5159/// will be updated to reflect a well-formed type for the destructor and 5160/// returned. 5161QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5162 StorageClass& SC) { 5163 // C++ [class.dtor]p1: 5164 // [...] A typedef-name that names a class is a class-name 5165 // (7.1.3); however, a typedef-name that names a class shall not 5166 // be used as the identifier in the declarator for a destructor 5167 // declaration. 5168 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5169 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5170 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5171 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5172 else if (const TemplateSpecializationType *TST = 5173 DeclaratorType->getAs<TemplateSpecializationType>()) 5174 if (TST->isTypeAlias()) 5175 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5176 << DeclaratorType << 1; 5177 5178 // C++ [class.dtor]p2: 5179 // A destructor is used to destroy objects of its class type. A 5180 // destructor takes no parameters, and no return type can be 5181 // specified for it (not even void). The address of a destructor 5182 // shall not be taken. A destructor shall not be static. A 5183 // destructor can be invoked for a const, volatile or const 5184 // volatile object. A destructor shall not be declared const, 5185 // volatile or const volatile (9.3.2). 5186 if (SC == SC_Static) { 5187 if (!D.isInvalidType()) 5188 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5189 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5190 << SourceRange(D.getIdentifierLoc()) 5191 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5192 5193 SC = SC_None; 5194 } 5195 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5196 // Destructors don't have return types, but the parser will 5197 // happily parse something like: 5198 // 5199 // class X { 5200 // float ~X(); 5201 // }; 5202 // 5203 // The return type will be eliminated later. 5204 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5205 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5206 << SourceRange(D.getIdentifierLoc()); 5207 } 5208 5209 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5210 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5211 if (FTI.TypeQuals & Qualifiers::Const) 5212 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5213 << "const" << SourceRange(D.getIdentifierLoc()); 5214 if (FTI.TypeQuals & Qualifiers::Volatile) 5215 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5216 << "volatile" << SourceRange(D.getIdentifierLoc()); 5217 if (FTI.TypeQuals & Qualifiers::Restrict) 5218 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5219 << "restrict" << SourceRange(D.getIdentifierLoc()); 5220 D.setInvalidType(); 5221 } 5222 5223 // C++0x [class.dtor]p2: 5224 // A destructor shall not be declared with a ref-qualifier. 5225 if (FTI.hasRefQualifier()) { 5226 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5227 << FTI.RefQualifierIsLValueRef 5228 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5229 D.setInvalidType(); 5230 } 5231 5232 // Make sure we don't have any parameters. 5233 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5234 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5235 5236 // Delete the parameters. 5237 FTI.freeArgs(); 5238 D.setInvalidType(); 5239 } 5240 5241 // Make sure the destructor isn't variadic. 5242 if (FTI.isVariadic) { 5243 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5244 D.setInvalidType(); 5245 } 5246 5247 // Rebuild the function type "R" without any type qualifiers or 5248 // parameters (in case any of the errors above fired) and with 5249 // "void" as the return type, since destructors don't have return 5250 // types. 5251 if (!D.isInvalidType()) 5252 return R; 5253 5254 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5255 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5256 EPI.Variadic = false; 5257 EPI.TypeQuals = 0; 5258 EPI.RefQualifier = RQ_None; 5259 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5260} 5261 5262/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5263/// well-formednes of the conversion function declarator @p D with 5264/// type @p R. If there are any errors in the declarator, this routine 5265/// will emit diagnostics and return true. Otherwise, it will return 5266/// false. Either way, the type @p R will be updated to reflect a 5267/// well-formed type for the conversion operator. 5268void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5269 StorageClass& SC) { 5270 // C++ [class.conv.fct]p1: 5271 // Neither parameter types nor return type can be specified. The 5272 // type of a conversion function (8.3.5) is "function taking no 5273 // parameter returning conversion-type-id." 5274 if (SC == SC_Static) { 5275 if (!D.isInvalidType()) 5276 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5277 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5278 << SourceRange(D.getIdentifierLoc()); 5279 D.setInvalidType(); 5280 SC = SC_None; 5281 } 5282 5283 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5284 5285 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5286 // Conversion functions don't have return types, but the parser will 5287 // happily parse something like: 5288 // 5289 // class X { 5290 // float operator bool(); 5291 // }; 5292 // 5293 // The return type will be changed later anyway. 5294 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5295 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5296 << SourceRange(D.getIdentifierLoc()); 5297 D.setInvalidType(); 5298 } 5299 5300 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5301 5302 // Make sure we don't have any parameters. 5303 if (Proto->getNumArgs() > 0) { 5304 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5305 5306 // Delete the parameters. 5307 D.getFunctionTypeInfo().freeArgs(); 5308 D.setInvalidType(); 5309 } else if (Proto->isVariadic()) { 5310 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5311 D.setInvalidType(); 5312 } 5313 5314 // Diagnose "&operator bool()" and other such nonsense. This 5315 // is actually a gcc extension which we don't support. 5316 if (Proto->getResultType() != ConvType) { 5317 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5318 << Proto->getResultType(); 5319 D.setInvalidType(); 5320 ConvType = Proto->getResultType(); 5321 } 5322 5323 // C++ [class.conv.fct]p4: 5324 // The conversion-type-id shall not represent a function type nor 5325 // an array type. 5326 if (ConvType->isArrayType()) { 5327 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5328 ConvType = Context.getPointerType(ConvType); 5329 D.setInvalidType(); 5330 } else if (ConvType->isFunctionType()) { 5331 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5332 ConvType = Context.getPointerType(ConvType); 5333 D.setInvalidType(); 5334 } 5335 5336 // Rebuild the function type "R" without any parameters (in case any 5337 // of the errors above fired) and with the conversion type as the 5338 // return type. 5339 if (D.isInvalidType()) 5340 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5341 5342 // C++0x explicit conversion operators. 5343 if (D.getDeclSpec().isExplicitSpecified()) 5344 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5345 getLangOptions().CPlusPlus0x ? 5346 diag::warn_cxx98_compat_explicit_conversion_functions : 5347 diag::ext_explicit_conversion_functions) 5348 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5349} 5350 5351/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5352/// the declaration of the given C++ conversion function. This routine 5353/// is responsible for recording the conversion function in the C++ 5354/// class, if possible. 5355Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5356 assert(Conversion && "Expected to receive a conversion function declaration"); 5357 5358 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5359 5360 // Make sure we aren't redeclaring the conversion function. 5361 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5362 5363 // C++ [class.conv.fct]p1: 5364 // [...] A conversion function is never used to convert a 5365 // (possibly cv-qualified) object to the (possibly cv-qualified) 5366 // same object type (or a reference to it), to a (possibly 5367 // cv-qualified) base class of that type (or a reference to it), 5368 // or to (possibly cv-qualified) void. 5369 // FIXME: Suppress this warning if the conversion function ends up being a 5370 // virtual function that overrides a virtual function in a base class. 5371 QualType ClassType 5372 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5373 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5374 ConvType = ConvTypeRef->getPointeeType(); 5375 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5376 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5377 /* Suppress diagnostics for instantiations. */; 5378 else if (ConvType->isRecordType()) { 5379 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5380 if (ConvType == ClassType) 5381 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5382 << ClassType; 5383 else if (IsDerivedFrom(ClassType, ConvType)) 5384 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5385 << ClassType << ConvType; 5386 } else if (ConvType->isVoidType()) { 5387 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5388 << ClassType << ConvType; 5389 } 5390 5391 if (FunctionTemplateDecl *ConversionTemplate 5392 = Conversion->getDescribedFunctionTemplate()) 5393 return ConversionTemplate; 5394 5395 return Conversion; 5396} 5397 5398//===----------------------------------------------------------------------===// 5399// Namespace Handling 5400//===----------------------------------------------------------------------===// 5401 5402 5403 5404/// ActOnStartNamespaceDef - This is called at the start of a namespace 5405/// definition. 5406Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5407 SourceLocation InlineLoc, 5408 SourceLocation NamespaceLoc, 5409 SourceLocation IdentLoc, 5410 IdentifierInfo *II, 5411 SourceLocation LBrace, 5412 AttributeList *AttrList) { 5413 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5414 // For anonymous namespace, take the location of the left brace. 5415 SourceLocation Loc = II ? IdentLoc : LBrace; 5416 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5417 StartLoc, Loc, II); 5418 Namespc->setInline(InlineLoc.isValid()); 5419 5420 Scope *DeclRegionScope = NamespcScope->getParent(); 5421 5422 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5423 5424 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5425 PushNamespaceVisibilityAttr(Attr); 5426 5427 if (II) { 5428 // C++ [namespace.def]p2: 5429 // The identifier in an original-namespace-definition shall not 5430 // have been previously defined in the declarative region in 5431 // which the original-namespace-definition appears. The 5432 // identifier in an original-namespace-definition is the name of 5433 // the namespace. Subsequently in that declarative region, it is 5434 // treated as an original-namespace-name. 5435 // 5436 // Since namespace names are unique in their scope, and we don't 5437 // look through using directives, just look for any ordinary names. 5438 5439 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5440 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5441 Decl::IDNS_Namespace; 5442 NamedDecl *PrevDecl = 0; 5443 for (DeclContext::lookup_result R 5444 = CurContext->getRedeclContext()->lookup(II); 5445 R.first != R.second; ++R.first) { 5446 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5447 PrevDecl = *R.first; 5448 break; 5449 } 5450 } 5451 5452 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5453 // This is an extended namespace definition. 5454 if (Namespc->isInline() != OrigNS->isInline()) { 5455 // inline-ness must match 5456 if (OrigNS->isInline()) { 5457 // The user probably just forgot the 'inline', so suggest that it 5458 // be added back. 5459 Diag(Namespc->getLocation(), 5460 diag::warn_inline_namespace_reopened_noninline) 5461 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5462 } else { 5463 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5464 << Namespc->isInline(); 5465 } 5466 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5467 5468 // Recover by ignoring the new namespace's inline status. 5469 Namespc->setInline(OrigNS->isInline()); 5470 } 5471 5472 // Attach this namespace decl to the chain of extended namespace 5473 // definitions. 5474 OrigNS->setNextNamespace(Namespc); 5475 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5476 5477 // Remove the previous declaration from the scope. 5478 if (DeclRegionScope->isDeclScope(OrigNS)) { 5479 IdResolver.RemoveDecl(OrigNS); 5480 DeclRegionScope->RemoveDecl(OrigNS); 5481 } 5482 } else if (PrevDecl) { 5483 // This is an invalid name redefinition. 5484 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5485 << Namespc->getDeclName(); 5486 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5487 Namespc->setInvalidDecl(); 5488 // Continue on to push Namespc as current DeclContext and return it. 5489 } else if (II->isStr("std") && 5490 CurContext->getRedeclContext()->isTranslationUnit()) { 5491 // This is the first "real" definition of the namespace "std", so update 5492 // our cache of the "std" namespace to point at this definition. 5493 if (NamespaceDecl *StdNS = getStdNamespace()) { 5494 // We had already defined a dummy namespace "std". Link this new 5495 // namespace definition to the dummy namespace "std". 5496 StdNS->setNextNamespace(Namespc); 5497 StdNS->setLocation(IdentLoc); 5498 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5499 } 5500 5501 // Make our StdNamespace cache point at the first real definition of the 5502 // "std" namespace. 5503 StdNamespace = Namespc; 5504 5505 // Add this instance of "std" to the set of known namespaces 5506 KnownNamespaces[Namespc] = false; 5507 } else if (!Namespc->isInline()) { 5508 // Since this is an "original" namespace, add it to the known set of 5509 // namespaces if it is not an inline namespace. 5510 KnownNamespaces[Namespc] = false; 5511 } 5512 5513 PushOnScopeChains(Namespc, DeclRegionScope); 5514 } else { 5515 // Anonymous namespaces. 5516 assert(Namespc->isAnonymousNamespace()); 5517 5518 // Link the anonymous namespace into its parent. 5519 NamespaceDecl *PrevDecl; 5520 DeclContext *Parent = CurContext->getRedeclContext(); 5521 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5522 PrevDecl = TU->getAnonymousNamespace(); 5523 TU->setAnonymousNamespace(Namespc); 5524 } else { 5525 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5526 PrevDecl = ND->getAnonymousNamespace(); 5527 ND->setAnonymousNamespace(Namespc); 5528 } 5529 5530 // Link the anonymous namespace with its previous declaration. 5531 if (PrevDecl) { 5532 assert(PrevDecl->isAnonymousNamespace()); 5533 assert(!PrevDecl->getNextNamespace()); 5534 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5535 PrevDecl->setNextNamespace(Namespc); 5536 5537 if (Namespc->isInline() != PrevDecl->isInline()) { 5538 // inline-ness must match 5539 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5540 << Namespc->isInline(); 5541 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5542 Namespc->setInvalidDecl(); 5543 // Recover by ignoring the new namespace's inline status. 5544 Namespc->setInline(PrevDecl->isInline()); 5545 } 5546 } 5547 5548 CurContext->addDecl(Namespc); 5549 5550 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5551 // behaves as if it were replaced by 5552 // namespace unique { /* empty body */ } 5553 // using namespace unique; 5554 // namespace unique { namespace-body } 5555 // where all occurrences of 'unique' in a translation unit are 5556 // replaced by the same identifier and this identifier differs 5557 // from all other identifiers in the entire program. 5558 5559 // We just create the namespace with an empty name and then add an 5560 // implicit using declaration, just like the standard suggests. 5561 // 5562 // CodeGen enforces the "universally unique" aspect by giving all 5563 // declarations semantically contained within an anonymous 5564 // namespace internal linkage. 5565 5566 if (!PrevDecl) { 5567 UsingDirectiveDecl* UD 5568 = UsingDirectiveDecl::Create(Context, CurContext, 5569 /* 'using' */ LBrace, 5570 /* 'namespace' */ SourceLocation(), 5571 /* qualifier */ NestedNameSpecifierLoc(), 5572 /* identifier */ SourceLocation(), 5573 Namespc, 5574 /* Ancestor */ CurContext); 5575 UD->setImplicit(); 5576 CurContext->addDecl(UD); 5577 } 5578 } 5579 5580 // Although we could have an invalid decl (i.e. the namespace name is a 5581 // redefinition), push it as current DeclContext and try to continue parsing. 5582 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5583 // for the namespace has the declarations that showed up in that particular 5584 // namespace definition. 5585 PushDeclContext(NamespcScope, Namespc); 5586 return Namespc; 5587} 5588 5589/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5590/// is a namespace alias, returns the namespace it points to. 5591static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5592 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5593 return AD->getNamespace(); 5594 return dyn_cast_or_null<NamespaceDecl>(D); 5595} 5596 5597/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5598/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5599void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5600 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5601 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5602 Namespc->setRBraceLoc(RBrace); 5603 PopDeclContext(); 5604 if (Namespc->hasAttr<VisibilityAttr>()) 5605 PopPragmaVisibility(); 5606} 5607 5608CXXRecordDecl *Sema::getStdBadAlloc() const { 5609 return cast_or_null<CXXRecordDecl>( 5610 StdBadAlloc.get(Context.getExternalSource())); 5611} 5612 5613NamespaceDecl *Sema::getStdNamespace() const { 5614 return cast_or_null<NamespaceDecl>( 5615 StdNamespace.get(Context.getExternalSource())); 5616} 5617 5618/// \brief Retrieve the special "std" namespace, which may require us to 5619/// implicitly define the namespace. 5620NamespaceDecl *Sema::getOrCreateStdNamespace() { 5621 if (!StdNamespace) { 5622 // The "std" namespace has not yet been defined, so build one implicitly. 5623 StdNamespace = NamespaceDecl::Create(Context, 5624 Context.getTranslationUnitDecl(), 5625 SourceLocation(), SourceLocation(), 5626 &PP.getIdentifierTable().get("std")); 5627 getStdNamespace()->setImplicit(true); 5628 } 5629 5630 return getStdNamespace(); 5631} 5632 5633/// \brief Determine whether a using statement is in a context where it will be 5634/// apply in all contexts. 5635static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5636 switch (CurContext->getDeclKind()) { 5637 case Decl::TranslationUnit: 5638 return true; 5639 case Decl::LinkageSpec: 5640 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5641 default: 5642 return false; 5643 } 5644} 5645 5646static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5647 CXXScopeSpec &SS, 5648 SourceLocation IdentLoc, 5649 IdentifierInfo *Ident) { 5650 R.clear(); 5651 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5652 R.getLookupKind(), Sc, &SS, NULL, 5653 false, S.CTC_NoKeywords, NULL)) { 5654 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5655 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5656 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5657 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5658 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5659 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5660 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5661 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5662 else 5663 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5664 << Ident << CorrectedQuotedStr 5665 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5666 5667 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5668 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5669 5670 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5671 R.addDecl(Corrected.getCorrectionDecl()); 5672 return true; 5673 } 5674 R.setLookupName(Ident); 5675 } 5676 return false; 5677} 5678 5679Decl *Sema::ActOnUsingDirective(Scope *S, 5680 SourceLocation UsingLoc, 5681 SourceLocation NamespcLoc, 5682 CXXScopeSpec &SS, 5683 SourceLocation IdentLoc, 5684 IdentifierInfo *NamespcName, 5685 AttributeList *AttrList) { 5686 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5687 assert(NamespcName && "Invalid NamespcName."); 5688 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5689 5690 // This can only happen along a recovery path. 5691 while (S->getFlags() & Scope::TemplateParamScope) 5692 S = S->getParent(); 5693 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5694 5695 UsingDirectiveDecl *UDir = 0; 5696 NestedNameSpecifier *Qualifier = 0; 5697 if (SS.isSet()) 5698 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5699 5700 // Lookup namespace name. 5701 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5702 LookupParsedName(R, S, &SS); 5703 if (R.isAmbiguous()) 5704 return 0; 5705 5706 if (R.empty()) { 5707 R.clear(); 5708 // Allow "using namespace std;" or "using namespace ::std;" even if 5709 // "std" hasn't been defined yet, for GCC compatibility. 5710 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5711 NamespcName->isStr("std")) { 5712 Diag(IdentLoc, diag::ext_using_undefined_std); 5713 R.addDecl(getOrCreateStdNamespace()); 5714 R.resolveKind(); 5715 } 5716 // Otherwise, attempt typo correction. 5717 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5718 } 5719 5720 if (!R.empty()) { 5721 NamedDecl *Named = R.getFoundDecl(); 5722 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5723 && "expected namespace decl"); 5724 // C++ [namespace.udir]p1: 5725 // A using-directive specifies that the names in the nominated 5726 // namespace can be used in the scope in which the 5727 // using-directive appears after the using-directive. During 5728 // unqualified name lookup (3.4.1), the names appear as if they 5729 // were declared in the nearest enclosing namespace which 5730 // contains both the using-directive and the nominated 5731 // namespace. [Note: in this context, "contains" means "contains 5732 // directly or indirectly". ] 5733 5734 // Find enclosing context containing both using-directive and 5735 // nominated namespace. 5736 NamespaceDecl *NS = getNamespaceDecl(Named); 5737 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5738 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5739 CommonAncestor = CommonAncestor->getParent(); 5740 5741 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5742 SS.getWithLocInContext(Context), 5743 IdentLoc, Named, CommonAncestor); 5744 5745 if (IsUsingDirectiveInToplevelContext(CurContext) && 5746 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5747 Diag(IdentLoc, diag::warn_using_directive_in_header); 5748 } 5749 5750 PushUsingDirective(S, UDir); 5751 } else { 5752 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5753 } 5754 5755 // FIXME: We ignore attributes for now. 5756 return UDir; 5757} 5758 5759void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5760 // If scope has associated entity, then using directive is at namespace 5761 // or translation unit scope. We add UsingDirectiveDecls, into 5762 // it's lookup structure. 5763 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5764 Ctx->addDecl(UDir); 5765 else 5766 // Otherwise it is block-sope. using-directives will affect lookup 5767 // only to the end of scope. 5768 S->PushUsingDirective(UDir); 5769} 5770 5771 5772Decl *Sema::ActOnUsingDeclaration(Scope *S, 5773 AccessSpecifier AS, 5774 bool HasUsingKeyword, 5775 SourceLocation UsingLoc, 5776 CXXScopeSpec &SS, 5777 UnqualifiedId &Name, 5778 AttributeList *AttrList, 5779 bool IsTypeName, 5780 SourceLocation TypenameLoc) { 5781 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5782 5783 switch (Name.getKind()) { 5784 case UnqualifiedId::IK_ImplicitSelfParam: 5785 case UnqualifiedId::IK_Identifier: 5786 case UnqualifiedId::IK_OperatorFunctionId: 5787 case UnqualifiedId::IK_LiteralOperatorId: 5788 case UnqualifiedId::IK_ConversionFunctionId: 5789 break; 5790 5791 case UnqualifiedId::IK_ConstructorName: 5792 case UnqualifiedId::IK_ConstructorTemplateId: 5793 // C++0x inherited constructors. 5794 Diag(Name.getSourceRange().getBegin(), 5795 getLangOptions().CPlusPlus0x ? 5796 diag::warn_cxx98_compat_using_decl_constructor : 5797 diag::err_using_decl_constructor) 5798 << SS.getRange(); 5799 5800 if (getLangOptions().CPlusPlus0x) break; 5801 5802 return 0; 5803 5804 case UnqualifiedId::IK_DestructorName: 5805 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5806 << SS.getRange(); 5807 return 0; 5808 5809 case UnqualifiedId::IK_TemplateId: 5810 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5811 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5812 return 0; 5813 } 5814 5815 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5816 DeclarationName TargetName = TargetNameInfo.getName(); 5817 if (!TargetName) 5818 return 0; 5819 5820 // Warn about using declarations. 5821 // TODO: store that the declaration was written without 'using' and 5822 // talk about access decls instead of using decls in the 5823 // diagnostics. 5824 if (!HasUsingKeyword) { 5825 UsingLoc = Name.getSourceRange().getBegin(); 5826 5827 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5828 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5829 } 5830 5831 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5832 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5833 return 0; 5834 5835 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5836 TargetNameInfo, AttrList, 5837 /* IsInstantiation */ false, 5838 IsTypeName, TypenameLoc); 5839 if (UD) 5840 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5841 5842 return UD; 5843} 5844 5845/// \brief Determine whether a using declaration considers the given 5846/// declarations as "equivalent", e.g., if they are redeclarations of 5847/// the same entity or are both typedefs of the same type. 5848static bool 5849IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5850 bool &SuppressRedeclaration) { 5851 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5852 SuppressRedeclaration = false; 5853 return true; 5854 } 5855 5856 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5857 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5858 SuppressRedeclaration = true; 5859 return Context.hasSameType(TD1->getUnderlyingType(), 5860 TD2->getUnderlyingType()); 5861 } 5862 5863 return false; 5864} 5865 5866 5867/// Determines whether to create a using shadow decl for a particular 5868/// decl, given the set of decls existing prior to this using lookup. 5869bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5870 const LookupResult &Previous) { 5871 // Diagnose finding a decl which is not from a base class of the 5872 // current class. We do this now because there are cases where this 5873 // function will silently decide not to build a shadow decl, which 5874 // will pre-empt further diagnostics. 5875 // 5876 // We don't need to do this in C++0x because we do the check once on 5877 // the qualifier. 5878 // 5879 // FIXME: diagnose the following if we care enough: 5880 // struct A { int foo; }; 5881 // struct B : A { using A::foo; }; 5882 // template <class T> struct C : A {}; 5883 // template <class T> struct D : C<T> { using B::foo; } // <--- 5884 // This is invalid (during instantiation) in C++03 because B::foo 5885 // resolves to the using decl in B, which is not a base class of D<T>. 5886 // We can't diagnose it immediately because C<T> is an unknown 5887 // specialization. The UsingShadowDecl in D<T> then points directly 5888 // to A::foo, which will look well-formed when we instantiate. 5889 // The right solution is to not collapse the shadow-decl chain. 5890 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5891 DeclContext *OrigDC = Orig->getDeclContext(); 5892 5893 // Handle enums and anonymous structs. 5894 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5895 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5896 while (OrigRec->isAnonymousStructOrUnion()) 5897 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5898 5899 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5900 if (OrigDC == CurContext) { 5901 Diag(Using->getLocation(), 5902 diag::err_using_decl_nested_name_specifier_is_current_class) 5903 << Using->getQualifierLoc().getSourceRange(); 5904 Diag(Orig->getLocation(), diag::note_using_decl_target); 5905 return true; 5906 } 5907 5908 Diag(Using->getQualifierLoc().getBeginLoc(), 5909 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5910 << Using->getQualifier() 5911 << cast<CXXRecordDecl>(CurContext) 5912 << Using->getQualifierLoc().getSourceRange(); 5913 Diag(Orig->getLocation(), diag::note_using_decl_target); 5914 return true; 5915 } 5916 } 5917 5918 if (Previous.empty()) return false; 5919 5920 NamedDecl *Target = Orig; 5921 if (isa<UsingShadowDecl>(Target)) 5922 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5923 5924 // If the target happens to be one of the previous declarations, we 5925 // don't have a conflict. 5926 // 5927 // FIXME: but we might be increasing its access, in which case we 5928 // should redeclare it. 5929 NamedDecl *NonTag = 0, *Tag = 0; 5930 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5931 I != E; ++I) { 5932 NamedDecl *D = (*I)->getUnderlyingDecl(); 5933 bool Result; 5934 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5935 return Result; 5936 5937 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5938 } 5939 5940 if (Target->isFunctionOrFunctionTemplate()) { 5941 FunctionDecl *FD; 5942 if (isa<FunctionTemplateDecl>(Target)) 5943 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5944 else 5945 FD = cast<FunctionDecl>(Target); 5946 5947 NamedDecl *OldDecl = 0; 5948 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5949 case Ovl_Overload: 5950 return false; 5951 5952 case Ovl_NonFunction: 5953 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5954 break; 5955 5956 // We found a decl with the exact signature. 5957 case Ovl_Match: 5958 // If we're in a record, we want to hide the target, so we 5959 // return true (without a diagnostic) to tell the caller not to 5960 // build a shadow decl. 5961 if (CurContext->isRecord()) 5962 return true; 5963 5964 // If we're not in a record, this is an error. 5965 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5966 break; 5967 } 5968 5969 Diag(Target->getLocation(), diag::note_using_decl_target); 5970 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5971 return true; 5972 } 5973 5974 // Target is not a function. 5975 5976 if (isa<TagDecl>(Target)) { 5977 // No conflict between a tag and a non-tag. 5978 if (!Tag) return false; 5979 5980 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5981 Diag(Target->getLocation(), diag::note_using_decl_target); 5982 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5983 return true; 5984 } 5985 5986 // No conflict between a tag and a non-tag. 5987 if (!NonTag) return false; 5988 5989 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5990 Diag(Target->getLocation(), diag::note_using_decl_target); 5991 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5992 return true; 5993} 5994 5995/// Builds a shadow declaration corresponding to a 'using' declaration. 5996UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5997 UsingDecl *UD, 5998 NamedDecl *Orig) { 5999 6000 // If we resolved to another shadow declaration, just coalesce them. 6001 NamedDecl *Target = Orig; 6002 if (isa<UsingShadowDecl>(Target)) { 6003 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6004 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6005 } 6006 6007 UsingShadowDecl *Shadow 6008 = UsingShadowDecl::Create(Context, CurContext, 6009 UD->getLocation(), UD, Target); 6010 UD->addShadowDecl(Shadow); 6011 6012 Shadow->setAccess(UD->getAccess()); 6013 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6014 Shadow->setInvalidDecl(); 6015 6016 if (S) 6017 PushOnScopeChains(Shadow, S); 6018 else 6019 CurContext->addDecl(Shadow); 6020 6021 6022 return Shadow; 6023} 6024 6025/// Hides a using shadow declaration. This is required by the current 6026/// using-decl implementation when a resolvable using declaration in a 6027/// class is followed by a declaration which would hide or override 6028/// one or more of the using decl's targets; for example: 6029/// 6030/// struct Base { void foo(int); }; 6031/// struct Derived : Base { 6032/// using Base::foo; 6033/// void foo(int); 6034/// }; 6035/// 6036/// The governing language is C++03 [namespace.udecl]p12: 6037/// 6038/// When a using-declaration brings names from a base class into a 6039/// derived class scope, member functions in the derived class 6040/// override and/or hide member functions with the same name and 6041/// parameter types in a base class (rather than conflicting). 6042/// 6043/// There are two ways to implement this: 6044/// (1) optimistically create shadow decls when they're not hidden 6045/// by existing declarations, or 6046/// (2) don't create any shadow decls (or at least don't make them 6047/// visible) until we've fully parsed/instantiated the class. 6048/// The problem with (1) is that we might have to retroactively remove 6049/// a shadow decl, which requires several O(n) operations because the 6050/// decl structures are (very reasonably) not designed for removal. 6051/// (2) avoids this but is very fiddly and phase-dependent. 6052void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6053 if (Shadow->getDeclName().getNameKind() == 6054 DeclarationName::CXXConversionFunctionName) 6055 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6056 6057 // Remove it from the DeclContext... 6058 Shadow->getDeclContext()->removeDecl(Shadow); 6059 6060 // ...and the scope, if applicable... 6061 if (S) { 6062 S->RemoveDecl(Shadow); 6063 IdResolver.RemoveDecl(Shadow); 6064 } 6065 6066 // ...and the using decl. 6067 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6068 6069 // TODO: complain somehow if Shadow was used. It shouldn't 6070 // be possible for this to happen, because...? 6071} 6072 6073/// Builds a using declaration. 6074/// 6075/// \param IsInstantiation - Whether this call arises from an 6076/// instantiation of an unresolved using declaration. We treat 6077/// the lookup differently for these declarations. 6078NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6079 SourceLocation UsingLoc, 6080 CXXScopeSpec &SS, 6081 const DeclarationNameInfo &NameInfo, 6082 AttributeList *AttrList, 6083 bool IsInstantiation, 6084 bool IsTypeName, 6085 SourceLocation TypenameLoc) { 6086 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6087 SourceLocation IdentLoc = NameInfo.getLoc(); 6088 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6089 6090 // FIXME: We ignore attributes for now. 6091 6092 if (SS.isEmpty()) { 6093 Diag(IdentLoc, diag::err_using_requires_qualname); 6094 return 0; 6095 } 6096 6097 // Do the redeclaration lookup in the current scope. 6098 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6099 ForRedeclaration); 6100 Previous.setHideTags(false); 6101 if (S) { 6102 LookupName(Previous, S); 6103 6104 // It is really dumb that we have to do this. 6105 LookupResult::Filter F = Previous.makeFilter(); 6106 while (F.hasNext()) { 6107 NamedDecl *D = F.next(); 6108 if (!isDeclInScope(D, CurContext, S)) 6109 F.erase(); 6110 } 6111 F.done(); 6112 } else { 6113 assert(IsInstantiation && "no scope in non-instantiation"); 6114 assert(CurContext->isRecord() && "scope not record in instantiation"); 6115 LookupQualifiedName(Previous, CurContext); 6116 } 6117 6118 // Check for invalid redeclarations. 6119 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6120 return 0; 6121 6122 // Check for bad qualifiers. 6123 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6124 return 0; 6125 6126 DeclContext *LookupContext = computeDeclContext(SS); 6127 NamedDecl *D; 6128 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6129 if (!LookupContext) { 6130 if (IsTypeName) { 6131 // FIXME: not all declaration name kinds are legal here 6132 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6133 UsingLoc, TypenameLoc, 6134 QualifierLoc, 6135 IdentLoc, NameInfo.getName()); 6136 } else { 6137 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6138 QualifierLoc, NameInfo); 6139 } 6140 } else { 6141 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6142 NameInfo, IsTypeName); 6143 } 6144 D->setAccess(AS); 6145 CurContext->addDecl(D); 6146 6147 if (!LookupContext) return D; 6148 UsingDecl *UD = cast<UsingDecl>(D); 6149 6150 if (RequireCompleteDeclContext(SS, LookupContext)) { 6151 UD->setInvalidDecl(); 6152 return UD; 6153 } 6154 6155 // Constructor inheriting using decls get special treatment. 6156 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6157 if (CheckInheritedConstructorUsingDecl(UD)) 6158 UD->setInvalidDecl(); 6159 return UD; 6160 } 6161 6162 // Otherwise, look up the target name. 6163 6164 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6165 6166 // Unlike most lookups, we don't always want to hide tag 6167 // declarations: tag names are visible through the using declaration 6168 // even if hidden by ordinary names, *except* in a dependent context 6169 // where it's important for the sanity of two-phase lookup. 6170 if (!IsInstantiation) 6171 R.setHideTags(false); 6172 6173 LookupQualifiedName(R, LookupContext); 6174 6175 if (R.empty()) { 6176 Diag(IdentLoc, diag::err_no_member) 6177 << NameInfo.getName() << LookupContext << SS.getRange(); 6178 UD->setInvalidDecl(); 6179 return UD; 6180 } 6181 6182 if (R.isAmbiguous()) { 6183 UD->setInvalidDecl(); 6184 return UD; 6185 } 6186 6187 if (IsTypeName) { 6188 // If we asked for a typename and got a non-type decl, error out. 6189 if (!R.getAsSingle<TypeDecl>()) { 6190 Diag(IdentLoc, diag::err_using_typename_non_type); 6191 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6192 Diag((*I)->getUnderlyingDecl()->getLocation(), 6193 diag::note_using_decl_target); 6194 UD->setInvalidDecl(); 6195 return UD; 6196 } 6197 } else { 6198 // If we asked for a non-typename and we got a type, error out, 6199 // but only if this is an instantiation of an unresolved using 6200 // decl. Otherwise just silently find the type name. 6201 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6202 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6203 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6204 UD->setInvalidDecl(); 6205 return UD; 6206 } 6207 } 6208 6209 // C++0x N2914 [namespace.udecl]p6: 6210 // A using-declaration shall not name a namespace. 6211 if (R.getAsSingle<NamespaceDecl>()) { 6212 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6213 << SS.getRange(); 6214 UD->setInvalidDecl(); 6215 return UD; 6216 } 6217 6218 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6219 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6220 BuildUsingShadowDecl(S, UD, *I); 6221 } 6222 6223 return UD; 6224} 6225 6226/// Additional checks for a using declaration referring to a constructor name. 6227bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6228 if (UD->isTypeName()) { 6229 // FIXME: Cannot specify typename when specifying constructor 6230 return true; 6231 } 6232 6233 const Type *SourceType = UD->getQualifier()->getAsType(); 6234 assert(SourceType && 6235 "Using decl naming constructor doesn't have type in scope spec."); 6236 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6237 6238 // Check whether the named type is a direct base class. 6239 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6240 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6241 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6242 BaseIt != BaseE; ++BaseIt) { 6243 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6244 if (CanonicalSourceType == BaseType) 6245 break; 6246 } 6247 6248 if (BaseIt == BaseE) { 6249 // Did not find SourceType in the bases. 6250 Diag(UD->getUsingLocation(), 6251 diag::err_using_decl_constructor_not_in_direct_base) 6252 << UD->getNameInfo().getSourceRange() 6253 << QualType(SourceType, 0) << TargetClass; 6254 return true; 6255 } 6256 6257 BaseIt->setInheritConstructors(); 6258 6259 return false; 6260} 6261 6262/// Checks that the given using declaration is not an invalid 6263/// redeclaration. Note that this is checking only for the using decl 6264/// itself, not for any ill-formedness among the UsingShadowDecls. 6265bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6266 bool isTypeName, 6267 const CXXScopeSpec &SS, 6268 SourceLocation NameLoc, 6269 const LookupResult &Prev) { 6270 // C++03 [namespace.udecl]p8: 6271 // C++0x [namespace.udecl]p10: 6272 // A using-declaration is a declaration and can therefore be used 6273 // repeatedly where (and only where) multiple declarations are 6274 // allowed. 6275 // 6276 // That's in non-member contexts. 6277 if (!CurContext->getRedeclContext()->isRecord()) 6278 return false; 6279 6280 NestedNameSpecifier *Qual 6281 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6282 6283 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6284 NamedDecl *D = *I; 6285 6286 bool DTypename; 6287 NestedNameSpecifier *DQual; 6288 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6289 DTypename = UD->isTypeName(); 6290 DQual = UD->getQualifier(); 6291 } else if (UnresolvedUsingValueDecl *UD 6292 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6293 DTypename = false; 6294 DQual = UD->getQualifier(); 6295 } else if (UnresolvedUsingTypenameDecl *UD 6296 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6297 DTypename = true; 6298 DQual = UD->getQualifier(); 6299 } else continue; 6300 6301 // using decls differ if one says 'typename' and the other doesn't. 6302 // FIXME: non-dependent using decls? 6303 if (isTypeName != DTypename) continue; 6304 6305 // using decls differ if they name different scopes (but note that 6306 // template instantiation can cause this check to trigger when it 6307 // didn't before instantiation). 6308 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6309 Context.getCanonicalNestedNameSpecifier(DQual)) 6310 continue; 6311 6312 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6313 Diag(D->getLocation(), diag::note_using_decl) << 1; 6314 return true; 6315 } 6316 6317 return false; 6318} 6319 6320 6321/// Checks that the given nested-name qualifier used in a using decl 6322/// in the current context is appropriately related to the current 6323/// scope. If an error is found, diagnoses it and returns true. 6324bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6325 const CXXScopeSpec &SS, 6326 SourceLocation NameLoc) { 6327 DeclContext *NamedContext = computeDeclContext(SS); 6328 6329 if (!CurContext->isRecord()) { 6330 // C++03 [namespace.udecl]p3: 6331 // C++0x [namespace.udecl]p8: 6332 // A using-declaration for a class member shall be a member-declaration. 6333 6334 // If we weren't able to compute a valid scope, it must be a 6335 // dependent class scope. 6336 if (!NamedContext || NamedContext->isRecord()) { 6337 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6338 << SS.getRange(); 6339 return true; 6340 } 6341 6342 // Otherwise, everything is known to be fine. 6343 return false; 6344 } 6345 6346 // The current scope is a record. 6347 6348 // If the named context is dependent, we can't decide much. 6349 if (!NamedContext) { 6350 // FIXME: in C++0x, we can diagnose if we can prove that the 6351 // nested-name-specifier does not refer to a base class, which is 6352 // still possible in some cases. 6353 6354 // Otherwise we have to conservatively report that things might be 6355 // okay. 6356 return false; 6357 } 6358 6359 if (!NamedContext->isRecord()) { 6360 // Ideally this would point at the last name in the specifier, 6361 // but we don't have that level of source info. 6362 Diag(SS.getRange().getBegin(), 6363 diag::err_using_decl_nested_name_specifier_is_not_class) 6364 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6365 return true; 6366 } 6367 6368 if (!NamedContext->isDependentContext() && 6369 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6370 return true; 6371 6372 if (getLangOptions().CPlusPlus0x) { 6373 // C++0x [namespace.udecl]p3: 6374 // In a using-declaration used as a member-declaration, the 6375 // nested-name-specifier shall name a base class of the class 6376 // being defined. 6377 6378 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6379 cast<CXXRecordDecl>(NamedContext))) { 6380 if (CurContext == NamedContext) { 6381 Diag(NameLoc, 6382 diag::err_using_decl_nested_name_specifier_is_current_class) 6383 << SS.getRange(); 6384 return true; 6385 } 6386 6387 Diag(SS.getRange().getBegin(), 6388 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6389 << (NestedNameSpecifier*) SS.getScopeRep() 6390 << cast<CXXRecordDecl>(CurContext) 6391 << SS.getRange(); 6392 return true; 6393 } 6394 6395 return false; 6396 } 6397 6398 // C++03 [namespace.udecl]p4: 6399 // A using-declaration used as a member-declaration shall refer 6400 // to a member of a base class of the class being defined [etc.]. 6401 6402 // Salient point: SS doesn't have to name a base class as long as 6403 // lookup only finds members from base classes. Therefore we can 6404 // diagnose here only if we can prove that that can't happen, 6405 // i.e. if the class hierarchies provably don't intersect. 6406 6407 // TODO: it would be nice if "definitely valid" results were cached 6408 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6409 // need to be repeated. 6410 6411 struct UserData { 6412 llvm::DenseSet<const CXXRecordDecl*> Bases; 6413 6414 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6415 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6416 Data->Bases.insert(Base); 6417 return true; 6418 } 6419 6420 bool hasDependentBases(const CXXRecordDecl *Class) { 6421 return !Class->forallBases(collect, this); 6422 } 6423 6424 /// Returns true if the base is dependent or is one of the 6425 /// accumulated base classes. 6426 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6427 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6428 return !Data->Bases.count(Base); 6429 } 6430 6431 bool mightShareBases(const CXXRecordDecl *Class) { 6432 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6433 } 6434 }; 6435 6436 UserData Data; 6437 6438 // Returns false if we find a dependent base. 6439 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6440 return false; 6441 6442 // Returns false if the class has a dependent base or if it or one 6443 // of its bases is present in the base set of the current context. 6444 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6445 return false; 6446 6447 Diag(SS.getRange().getBegin(), 6448 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6449 << (NestedNameSpecifier*) SS.getScopeRep() 6450 << cast<CXXRecordDecl>(CurContext) 6451 << SS.getRange(); 6452 6453 return true; 6454} 6455 6456Decl *Sema::ActOnAliasDeclaration(Scope *S, 6457 AccessSpecifier AS, 6458 MultiTemplateParamsArg TemplateParamLists, 6459 SourceLocation UsingLoc, 6460 UnqualifiedId &Name, 6461 TypeResult Type) { 6462 // Skip up to the relevant declaration scope. 6463 while (S->getFlags() & Scope::TemplateParamScope) 6464 S = S->getParent(); 6465 assert((S->getFlags() & Scope::DeclScope) && 6466 "got alias-declaration outside of declaration scope"); 6467 6468 if (Type.isInvalid()) 6469 return 0; 6470 6471 bool Invalid = false; 6472 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6473 TypeSourceInfo *TInfo = 0; 6474 GetTypeFromParser(Type.get(), &TInfo); 6475 6476 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6477 return 0; 6478 6479 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6480 UPPC_DeclarationType)) { 6481 Invalid = true; 6482 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6483 TInfo->getTypeLoc().getBeginLoc()); 6484 } 6485 6486 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6487 LookupName(Previous, S); 6488 6489 // Warn about shadowing the name of a template parameter. 6490 if (Previous.isSingleResult() && 6491 Previous.getFoundDecl()->isTemplateParameter()) { 6492 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6493 Previous.clear(); 6494 } 6495 6496 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6497 "name in alias declaration must be an identifier"); 6498 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6499 Name.StartLocation, 6500 Name.Identifier, TInfo); 6501 6502 NewTD->setAccess(AS); 6503 6504 if (Invalid) 6505 NewTD->setInvalidDecl(); 6506 6507 CheckTypedefForVariablyModifiedType(S, NewTD); 6508 Invalid |= NewTD->isInvalidDecl(); 6509 6510 bool Redeclaration = false; 6511 6512 NamedDecl *NewND; 6513 if (TemplateParamLists.size()) { 6514 TypeAliasTemplateDecl *OldDecl = 0; 6515 TemplateParameterList *OldTemplateParams = 0; 6516 6517 if (TemplateParamLists.size() != 1) { 6518 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6519 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6520 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6521 } 6522 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6523 6524 // Only consider previous declarations in the same scope. 6525 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6526 /*ExplicitInstantiationOrSpecialization*/false); 6527 if (!Previous.empty()) { 6528 Redeclaration = true; 6529 6530 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6531 if (!OldDecl && !Invalid) { 6532 Diag(UsingLoc, diag::err_redefinition_different_kind) 6533 << Name.Identifier; 6534 6535 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6536 if (OldD->getLocation().isValid()) 6537 Diag(OldD->getLocation(), diag::note_previous_definition); 6538 6539 Invalid = true; 6540 } 6541 6542 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6543 if (TemplateParameterListsAreEqual(TemplateParams, 6544 OldDecl->getTemplateParameters(), 6545 /*Complain=*/true, 6546 TPL_TemplateMatch)) 6547 OldTemplateParams = OldDecl->getTemplateParameters(); 6548 else 6549 Invalid = true; 6550 6551 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6552 if (!Invalid && 6553 !Context.hasSameType(OldTD->getUnderlyingType(), 6554 NewTD->getUnderlyingType())) { 6555 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6556 // but we can't reasonably accept it. 6557 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6558 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6559 if (OldTD->getLocation().isValid()) 6560 Diag(OldTD->getLocation(), diag::note_previous_definition); 6561 Invalid = true; 6562 } 6563 } 6564 } 6565 6566 // Merge any previous default template arguments into our parameters, 6567 // and check the parameter list. 6568 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6569 TPC_TypeAliasTemplate)) 6570 return 0; 6571 6572 TypeAliasTemplateDecl *NewDecl = 6573 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6574 Name.Identifier, TemplateParams, 6575 NewTD); 6576 6577 NewDecl->setAccess(AS); 6578 6579 if (Invalid) 6580 NewDecl->setInvalidDecl(); 6581 else if (OldDecl) 6582 NewDecl->setPreviousDeclaration(OldDecl); 6583 6584 NewND = NewDecl; 6585 } else { 6586 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6587 NewND = NewTD; 6588 } 6589 6590 if (!Redeclaration) 6591 PushOnScopeChains(NewND, S); 6592 6593 return NewND; 6594} 6595 6596Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6597 SourceLocation NamespaceLoc, 6598 SourceLocation AliasLoc, 6599 IdentifierInfo *Alias, 6600 CXXScopeSpec &SS, 6601 SourceLocation IdentLoc, 6602 IdentifierInfo *Ident) { 6603 6604 // Lookup the namespace name. 6605 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6606 LookupParsedName(R, S, &SS); 6607 6608 // Check if we have a previous declaration with the same name. 6609 NamedDecl *PrevDecl 6610 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6611 ForRedeclaration); 6612 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6613 PrevDecl = 0; 6614 6615 if (PrevDecl) { 6616 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6617 // We already have an alias with the same name that points to the same 6618 // namespace, so don't create a new one. 6619 // FIXME: At some point, we'll want to create the (redundant) 6620 // declaration to maintain better source information. 6621 if (!R.isAmbiguous() && !R.empty() && 6622 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6623 return 0; 6624 } 6625 6626 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6627 diag::err_redefinition_different_kind; 6628 Diag(AliasLoc, DiagID) << Alias; 6629 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6630 return 0; 6631 } 6632 6633 if (R.isAmbiguous()) 6634 return 0; 6635 6636 if (R.empty()) { 6637 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6638 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6639 return 0; 6640 } 6641 } 6642 6643 NamespaceAliasDecl *AliasDecl = 6644 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6645 Alias, SS.getWithLocInContext(Context), 6646 IdentLoc, R.getFoundDecl()); 6647 6648 PushOnScopeChains(AliasDecl, S); 6649 return AliasDecl; 6650} 6651 6652namespace { 6653 /// \brief Scoped object used to handle the state changes required in Sema 6654 /// to implicitly define the body of a C++ member function; 6655 class ImplicitlyDefinedFunctionScope { 6656 Sema &S; 6657 Sema::ContextRAII SavedContext; 6658 6659 public: 6660 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6661 : S(S), SavedContext(S, Method) 6662 { 6663 S.PushFunctionScope(); 6664 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6665 } 6666 6667 ~ImplicitlyDefinedFunctionScope() { 6668 S.PopExpressionEvaluationContext(); 6669 S.PopFunctionOrBlockScope(); 6670 } 6671 }; 6672} 6673 6674Sema::ImplicitExceptionSpecification 6675Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6676 // C++ [except.spec]p14: 6677 // An implicitly declared special member function (Clause 12) shall have an 6678 // exception-specification. [...] 6679 ImplicitExceptionSpecification ExceptSpec(Context); 6680 if (ClassDecl->isInvalidDecl()) 6681 return ExceptSpec; 6682 6683 // Direct base-class constructors. 6684 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6685 BEnd = ClassDecl->bases_end(); 6686 B != BEnd; ++B) { 6687 if (B->isVirtual()) // Handled below. 6688 continue; 6689 6690 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6691 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6692 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6693 // If this is a deleted function, add it anyway. This might be conformant 6694 // with the standard. This might not. I'm not sure. It might not matter. 6695 if (Constructor) 6696 ExceptSpec.CalledDecl(Constructor); 6697 } 6698 } 6699 6700 // Virtual base-class constructors. 6701 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6702 BEnd = ClassDecl->vbases_end(); 6703 B != BEnd; ++B) { 6704 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6705 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6706 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6707 // If this is a deleted function, add it anyway. This might be conformant 6708 // with the standard. This might not. I'm not sure. It might not matter. 6709 if (Constructor) 6710 ExceptSpec.CalledDecl(Constructor); 6711 } 6712 } 6713 6714 // Field constructors. 6715 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6716 FEnd = ClassDecl->field_end(); 6717 F != FEnd; ++F) { 6718 if (F->hasInClassInitializer()) { 6719 if (Expr *E = F->getInClassInitializer()) 6720 ExceptSpec.CalledExpr(E); 6721 else if (!F->isInvalidDecl()) 6722 ExceptSpec.SetDelayed(); 6723 } else if (const RecordType *RecordTy 6724 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6725 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6726 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6727 // If this is a deleted function, add it anyway. This might be conformant 6728 // with the standard. This might not. I'm not sure. It might not matter. 6729 // In particular, the problem is that this function never gets called. It 6730 // might just be ill-formed because this function attempts to refer to 6731 // a deleted function here. 6732 if (Constructor) 6733 ExceptSpec.CalledDecl(Constructor); 6734 } 6735 } 6736 6737 return ExceptSpec; 6738} 6739 6740CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6741 CXXRecordDecl *ClassDecl) { 6742 // C++ [class.ctor]p5: 6743 // A default constructor for a class X is a constructor of class X 6744 // that can be called without an argument. If there is no 6745 // user-declared constructor for class X, a default constructor is 6746 // implicitly declared. An implicitly-declared default constructor 6747 // is an inline public member of its class. 6748 assert(!ClassDecl->hasUserDeclaredConstructor() && 6749 "Should not build implicit default constructor!"); 6750 6751 ImplicitExceptionSpecification Spec = 6752 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6753 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6754 6755 // Create the actual constructor declaration. 6756 CanQualType ClassType 6757 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6758 SourceLocation ClassLoc = ClassDecl->getLocation(); 6759 DeclarationName Name 6760 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6761 DeclarationNameInfo NameInfo(Name, ClassLoc); 6762 CXXConstructorDecl *DefaultCon 6763 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6764 Context.getFunctionType(Context.VoidTy, 6765 0, 0, EPI), 6766 /*TInfo=*/0, 6767 /*isExplicit=*/false, 6768 /*isInline=*/true, 6769 /*isImplicitlyDeclared=*/true, 6770 // FIXME: apply the rules for definitions here 6771 /*isConstexpr=*/false); 6772 DefaultCon->setAccess(AS_public); 6773 DefaultCon->setDefaulted(); 6774 DefaultCon->setImplicit(); 6775 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6776 6777 // Note that we have declared this constructor. 6778 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6779 6780 if (Scope *S = getScopeForContext(ClassDecl)) 6781 PushOnScopeChains(DefaultCon, S, false); 6782 ClassDecl->addDecl(DefaultCon); 6783 6784 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6785 DefaultCon->setDeletedAsWritten(); 6786 6787 return DefaultCon; 6788} 6789 6790void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6791 CXXConstructorDecl *Constructor) { 6792 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6793 !Constructor->doesThisDeclarationHaveABody() && 6794 !Constructor->isDeleted()) && 6795 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6796 6797 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6798 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6799 6800 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6801 DiagnosticErrorTrap Trap(Diags); 6802 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6803 Trap.hasErrorOccurred()) { 6804 Diag(CurrentLocation, diag::note_member_synthesized_at) 6805 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6806 Constructor->setInvalidDecl(); 6807 return; 6808 } 6809 6810 SourceLocation Loc = Constructor->getLocation(); 6811 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6812 6813 Constructor->setUsed(); 6814 MarkVTableUsed(CurrentLocation, ClassDecl); 6815 6816 if (ASTMutationListener *L = getASTMutationListener()) { 6817 L->CompletedImplicitDefinition(Constructor); 6818 } 6819} 6820 6821/// Get any existing defaulted default constructor for the given class. Do not 6822/// implicitly define one if it does not exist. 6823static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6824 CXXRecordDecl *D) { 6825 ASTContext &Context = Self.Context; 6826 QualType ClassType = Context.getTypeDeclType(D); 6827 DeclarationName ConstructorName 6828 = Context.DeclarationNames.getCXXConstructorName( 6829 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6830 6831 DeclContext::lookup_const_iterator Con, ConEnd; 6832 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6833 Con != ConEnd; ++Con) { 6834 // A function template cannot be defaulted. 6835 if (isa<FunctionTemplateDecl>(*Con)) 6836 continue; 6837 6838 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6839 if (Constructor->isDefaultConstructor()) 6840 return Constructor->isDefaulted() ? Constructor : 0; 6841 } 6842 return 0; 6843} 6844 6845void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6846 if (!D) return; 6847 AdjustDeclIfTemplate(D); 6848 6849 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6850 CXXConstructorDecl *CtorDecl 6851 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6852 6853 if (!CtorDecl) return; 6854 6855 // Compute the exception specification for the default constructor. 6856 const FunctionProtoType *CtorTy = 6857 CtorDecl->getType()->castAs<FunctionProtoType>(); 6858 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6859 ImplicitExceptionSpecification Spec = 6860 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6861 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6862 assert(EPI.ExceptionSpecType != EST_Delayed); 6863 6864 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6865 } 6866 6867 // If the default constructor is explicitly defaulted, checking the exception 6868 // specification is deferred until now. 6869 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6870 !ClassDecl->isDependentType()) 6871 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6872} 6873 6874void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6875 // We start with an initial pass over the base classes to collect those that 6876 // inherit constructors from. If there are none, we can forgo all further 6877 // processing. 6878 typedef SmallVector<const RecordType *, 4> BasesVector; 6879 BasesVector BasesToInheritFrom; 6880 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6881 BaseE = ClassDecl->bases_end(); 6882 BaseIt != BaseE; ++BaseIt) { 6883 if (BaseIt->getInheritConstructors()) { 6884 QualType Base = BaseIt->getType(); 6885 if (Base->isDependentType()) { 6886 // If we inherit constructors from anything that is dependent, just 6887 // abort processing altogether. We'll get another chance for the 6888 // instantiations. 6889 return; 6890 } 6891 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6892 } 6893 } 6894 if (BasesToInheritFrom.empty()) 6895 return; 6896 6897 // Now collect the constructors that we already have in the current class. 6898 // Those take precedence over inherited constructors. 6899 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6900 // unless there is a user-declared constructor with the same signature in 6901 // the class where the using-declaration appears. 6902 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6903 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6904 CtorE = ClassDecl->ctor_end(); 6905 CtorIt != CtorE; ++CtorIt) { 6906 ExistingConstructors.insert( 6907 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6908 } 6909 6910 Scope *S = getScopeForContext(ClassDecl); 6911 DeclarationName CreatedCtorName = 6912 Context.DeclarationNames.getCXXConstructorName( 6913 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6914 6915 // Now comes the true work. 6916 // First, we keep a map from constructor types to the base that introduced 6917 // them. Needed for finding conflicting constructors. We also keep the 6918 // actually inserted declarations in there, for pretty diagnostics. 6919 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6920 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6921 ConstructorToSourceMap InheritedConstructors; 6922 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6923 BaseE = BasesToInheritFrom.end(); 6924 BaseIt != BaseE; ++BaseIt) { 6925 const RecordType *Base = *BaseIt; 6926 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6927 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6928 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6929 CtorE = BaseDecl->ctor_end(); 6930 CtorIt != CtorE; ++CtorIt) { 6931 // Find the using declaration for inheriting this base's constructors. 6932 DeclarationName Name = 6933 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6934 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6935 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6936 SourceLocation UsingLoc = UD ? UD->getLocation() : 6937 ClassDecl->getLocation(); 6938 6939 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6940 // from the class X named in the using-declaration consists of actual 6941 // constructors and notional constructors that result from the 6942 // transformation of defaulted parameters as follows: 6943 // - all non-template default constructors of X, and 6944 // - for each non-template constructor of X that has at least one 6945 // parameter with a default argument, the set of constructors that 6946 // results from omitting any ellipsis parameter specification and 6947 // successively omitting parameters with a default argument from the 6948 // end of the parameter-type-list. 6949 CXXConstructorDecl *BaseCtor = *CtorIt; 6950 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6951 const FunctionProtoType *BaseCtorType = 6952 BaseCtor->getType()->getAs<FunctionProtoType>(); 6953 6954 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6955 maxParams = BaseCtor->getNumParams(); 6956 params <= maxParams; ++params) { 6957 // Skip default constructors. They're never inherited. 6958 if (params == 0) 6959 continue; 6960 // Skip copy and move constructors for the same reason. 6961 if (CanBeCopyOrMove && params == 1) 6962 continue; 6963 6964 // Build up a function type for this particular constructor. 6965 // FIXME: The working paper does not consider that the exception spec 6966 // for the inheriting constructor might be larger than that of the 6967 // source. This code doesn't yet, either. When it does, this code will 6968 // need to be delayed until after exception specifications and in-class 6969 // member initializers are attached. 6970 const Type *NewCtorType; 6971 if (params == maxParams) 6972 NewCtorType = BaseCtorType; 6973 else { 6974 SmallVector<QualType, 16> Args; 6975 for (unsigned i = 0; i < params; ++i) { 6976 Args.push_back(BaseCtorType->getArgType(i)); 6977 } 6978 FunctionProtoType::ExtProtoInfo ExtInfo = 6979 BaseCtorType->getExtProtoInfo(); 6980 ExtInfo.Variadic = false; 6981 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6982 Args.data(), params, ExtInfo) 6983 .getTypePtr(); 6984 } 6985 const Type *CanonicalNewCtorType = 6986 Context.getCanonicalType(NewCtorType); 6987 6988 // Now that we have the type, first check if the class already has a 6989 // constructor with this signature. 6990 if (ExistingConstructors.count(CanonicalNewCtorType)) 6991 continue; 6992 6993 // Then we check if we have already declared an inherited constructor 6994 // with this signature. 6995 std::pair<ConstructorToSourceMap::iterator, bool> result = 6996 InheritedConstructors.insert(std::make_pair( 6997 CanonicalNewCtorType, 6998 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6999 if (!result.second) { 7000 // Already in the map. If it came from a different class, that's an 7001 // error. Not if it's from the same. 7002 CanQualType PreviousBase = result.first->second.first; 7003 if (CanonicalBase != PreviousBase) { 7004 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7005 const CXXConstructorDecl *PrevBaseCtor = 7006 PrevCtor->getInheritedConstructor(); 7007 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7008 7009 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7010 Diag(BaseCtor->getLocation(), 7011 diag::note_using_decl_constructor_conflict_current_ctor); 7012 Diag(PrevBaseCtor->getLocation(), 7013 diag::note_using_decl_constructor_conflict_previous_ctor); 7014 Diag(PrevCtor->getLocation(), 7015 diag::note_using_decl_constructor_conflict_previous_using); 7016 } 7017 continue; 7018 } 7019 7020 // OK, we're there, now add the constructor. 7021 // C++0x [class.inhctor]p8: [...] that would be performed by a 7022 // user-written inline constructor [...] 7023 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7024 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7025 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7026 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7027 /*ImplicitlyDeclared=*/true, 7028 // FIXME: Due to a defect in the standard, we treat inherited 7029 // constructors as constexpr even if that makes them ill-formed. 7030 /*Constexpr=*/BaseCtor->isConstexpr()); 7031 NewCtor->setAccess(BaseCtor->getAccess()); 7032 7033 // Build up the parameter decls and add them. 7034 SmallVector<ParmVarDecl *, 16> ParamDecls; 7035 for (unsigned i = 0; i < params; ++i) { 7036 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7037 UsingLoc, UsingLoc, 7038 /*IdentifierInfo=*/0, 7039 BaseCtorType->getArgType(i), 7040 /*TInfo=*/0, SC_None, 7041 SC_None, /*DefaultArg=*/0)); 7042 } 7043 NewCtor->setParams(ParamDecls); 7044 NewCtor->setInheritedConstructor(BaseCtor); 7045 7046 PushOnScopeChains(NewCtor, S, false); 7047 ClassDecl->addDecl(NewCtor); 7048 result.first->second.second = NewCtor; 7049 } 7050 } 7051 } 7052} 7053 7054Sema::ImplicitExceptionSpecification 7055Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7056 // C++ [except.spec]p14: 7057 // An implicitly declared special member function (Clause 12) shall have 7058 // an exception-specification. 7059 ImplicitExceptionSpecification ExceptSpec(Context); 7060 if (ClassDecl->isInvalidDecl()) 7061 return ExceptSpec; 7062 7063 // Direct base-class destructors. 7064 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7065 BEnd = ClassDecl->bases_end(); 7066 B != BEnd; ++B) { 7067 if (B->isVirtual()) // Handled below. 7068 continue; 7069 7070 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7071 ExceptSpec.CalledDecl( 7072 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7073 } 7074 7075 // Virtual base-class destructors. 7076 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7077 BEnd = ClassDecl->vbases_end(); 7078 B != BEnd; ++B) { 7079 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7080 ExceptSpec.CalledDecl( 7081 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7082 } 7083 7084 // Field destructors. 7085 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7086 FEnd = ClassDecl->field_end(); 7087 F != FEnd; ++F) { 7088 if (const RecordType *RecordTy 7089 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7090 ExceptSpec.CalledDecl( 7091 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7092 } 7093 7094 return ExceptSpec; 7095} 7096 7097CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7098 // C++ [class.dtor]p2: 7099 // If a class has no user-declared destructor, a destructor is 7100 // declared implicitly. An implicitly-declared destructor is an 7101 // inline public member of its class. 7102 7103 ImplicitExceptionSpecification Spec = 7104 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7105 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7106 7107 // Create the actual destructor declaration. 7108 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7109 7110 CanQualType ClassType 7111 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7112 SourceLocation ClassLoc = ClassDecl->getLocation(); 7113 DeclarationName Name 7114 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7115 DeclarationNameInfo NameInfo(Name, ClassLoc); 7116 CXXDestructorDecl *Destructor 7117 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7118 /*isInline=*/true, 7119 /*isImplicitlyDeclared=*/true); 7120 Destructor->setAccess(AS_public); 7121 Destructor->setDefaulted(); 7122 Destructor->setImplicit(); 7123 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7124 7125 // Note that we have declared this destructor. 7126 ++ASTContext::NumImplicitDestructorsDeclared; 7127 7128 // Introduce this destructor into its scope. 7129 if (Scope *S = getScopeForContext(ClassDecl)) 7130 PushOnScopeChains(Destructor, S, false); 7131 ClassDecl->addDecl(Destructor); 7132 7133 // This could be uniqued if it ever proves significant. 7134 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7135 7136 if (ShouldDeleteDestructor(Destructor)) 7137 Destructor->setDeletedAsWritten(); 7138 7139 AddOverriddenMethods(ClassDecl, Destructor); 7140 7141 return Destructor; 7142} 7143 7144void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7145 CXXDestructorDecl *Destructor) { 7146 assert((Destructor->isDefaulted() && 7147 !Destructor->doesThisDeclarationHaveABody()) && 7148 "DefineImplicitDestructor - call it for implicit default dtor"); 7149 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7150 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7151 7152 if (Destructor->isInvalidDecl()) 7153 return; 7154 7155 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7156 7157 DiagnosticErrorTrap Trap(Diags); 7158 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7159 Destructor->getParent()); 7160 7161 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7162 Diag(CurrentLocation, diag::note_member_synthesized_at) 7163 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7164 7165 Destructor->setInvalidDecl(); 7166 return; 7167 } 7168 7169 SourceLocation Loc = Destructor->getLocation(); 7170 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7171 Destructor->setImplicitlyDefined(true); 7172 Destructor->setUsed(); 7173 MarkVTableUsed(CurrentLocation, ClassDecl); 7174 7175 if (ASTMutationListener *L = getASTMutationListener()) { 7176 L->CompletedImplicitDefinition(Destructor); 7177 } 7178} 7179 7180void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7181 CXXDestructorDecl *destructor) { 7182 // C++11 [class.dtor]p3: 7183 // A declaration of a destructor that does not have an exception- 7184 // specification is implicitly considered to have the same exception- 7185 // specification as an implicit declaration. 7186 const FunctionProtoType *dtorType = destructor->getType()-> 7187 getAs<FunctionProtoType>(); 7188 if (dtorType->hasExceptionSpec()) 7189 return; 7190 7191 ImplicitExceptionSpecification exceptSpec = 7192 ComputeDefaultedDtorExceptionSpec(classDecl); 7193 7194 // Replace the destructor's type, building off the existing one. Fortunately, 7195 // the only thing of interest in the destructor type is its extended info. 7196 // The return and arguments are fixed. 7197 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7198 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7199 epi.NumExceptions = exceptSpec.size(); 7200 epi.Exceptions = exceptSpec.data(); 7201 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7202 7203 destructor->setType(ty); 7204 7205 // FIXME: If the destructor has a body that could throw, and the newly created 7206 // spec doesn't allow exceptions, we should emit a warning, because this 7207 // change in behavior can break conforming C++03 programs at runtime. 7208 // However, we don't have a body yet, so it needs to be done somewhere else. 7209} 7210 7211/// \brief Builds a statement that copies/moves the given entity from \p From to 7212/// \c To. 7213/// 7214/// This routine is used to copy/move the members of a class with an 7215/// implicitly-declared copy/move assignment operator. When the entities being 7216/// copied are arrays, this routine builds for loops to copy them. 7217/// 7218/// \param S The Sema object used for type-checking. 7219/// 7220/// \param Loc The location where the implicit copy/move is being generated. 7221/// 7222/// \param T The type of the expressions being copied/moved. Both expressions 7223/// must have this type. 7224/// 7225/// \param To The expression we are copying/moving to. 7226/// 7227/// \param From The expression we are copying/moving from. 7228/// 7229/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7230/// Otherwise, it's a non-static member subobject. 7231/// 7232/// \param Copying Whether we're copying or moving. 7233/// 7234/// \param Depth Internal parameter recording the depth of the recursion. 7235/// 7236/// \returns A statement or a loop that copies the expressions. 7237static StmtResult 7238BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7239 Expr *To, Expr *From, 7240 bool CopyingBaseSubobject, bool Copying, 7241 unsigned Depth = 0) { 7242 // C++0x [class.copy]p28: 7243 // Each subobject is assigned in the manner appropriate to its type: 7244 // 7245 // - if the subobject is of class type, as if by a call to operator= with 7246 // the subobject as the object expression and the corresponding 7247 // subobject of x as a single function argument (as if by explicit 7248 // qualification; that is, ignoring any possible virtual overriding 7249 // functions in more derived classes); 7250 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7251 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7252 7253 // Look for operator=. 7254 DeclarationName Name 7255 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7256 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7257 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7258 7259 // Filter out any result that isn't a copy/move-assignment operator. 7260 LookupResult::Filter F = OpLookup.makeFilter(); 7261 while (F.hasNext()) { 7262 NamedDecl *D = F.next(); 7263 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7264 if (Copying ? Method->isCopyAssignmentOperator() : 7265 Method->isMoveAssignmentOperator()) 7266 continue; 7267 7268 F.erase(); 7269 } 7270 F.done(); 7271 7272 // Suppress the protected check (C++ [class.protected]) for each of the 7273 // assignment operators we found. This strange dance is required when 7274 // we're assigning via a base classes's copy-assignment operator. To 7275 // ensure that we're getting the right base class subobject (without 7276 // ambiguities), we need to cast "this" to that subobject type; to 7277 // ensure that we don't go through the virtual call mechanism, we need 7278 // to qualify the operator= name with the base class (see below). However, 7279 // this means that if the base class has a protected copy assignment 7280 // operator, the protected member access check will fail. So, we 7281 // rewrite "protected" access to "public" access in this case, since we 7282 // know by construction that we're calling from a derived class. 7283 if (CopyingBaseSubobject) { 7284 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7285 L != LEnd; ++L) { 7286 if (L.getAccess() == AS_protected) 7287 L.setAccess(AS_public); 7288 } 7289 } 7290 7291 // Create the nested-name-specifier that will be used to qualify the 7292 // reference to operator=; this is required to suppress the virtual 7293 // call mechanism. 7294 CXXScopeSpec SS; 7295 SS.MakeTrivial(S.Context, 7296 NestedNameSpecifier::Create(S.Context, 0, false, 7297 T.getTypePtr()), 7298 Loc); 7299 7300 // Create the reference to operator=. 7301 ExprResult OpEqualRef 7302 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7303 /*FirstQualifierInScope=*/0, OpLookup, 7304 /*TemplateArgs=*/0, 7305 /*SuppressQualifierCheck=*/true); 7306 if (OpEqualRef.isInvalid()) 7307 return StmtError(); 7308 7309 // Build the call to the assignment operator. 7310 7311 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7312 OpEqualRef.takeAs<Expr>(), 7313 Loc, &From, 1, Loc); 7314 if (Call.isInvalid()) 7315 return StmtError(); 7316 7317 return S.Owned(Call.takeAs<Stmt>()); 7318 } 7319 7320 // - if the subobject is of scalar type, the built-in assignment 7321 // operator is used. 7322 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7323 if (!ArrayTy) { 7324 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7325 if (Assignment.isInvalid()) 7326 return StmtError(); 7327 7328 return S.Owned(Assignment.takeAs<Stmt>()); 7329 } 7330 7331 // - if the subobject is an array, each element is assigned, in the 7332 // manner appropriate to the element type; 7333 7334 // Construct a loop over the array bounds, e.g., 7335 // 7336 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7337 // 7338 // that will copy each of the array elements. 7339 QualType SizeType = S.Context.getSizeType(); 7340 7341 // Create the iteration variable. 7342 IdentifierInfo *IterationVarName = 0; 7343 { 7344 llvm::SmallString<8> Str; 7345 llvm::raw_svector_ostream OS(Str); 7346 OS << "__i" << Depth; 7347 IterationVarName = &S.Context.Idents.get(OS.str()); 7348 } 7349 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7350 IterationVarName, SizeType, 7351 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7352 SC_None, SC_None); 7353 7354 // Initialize the iteration variable to zero. 7355 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7356 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7357 7358 // Create a reference to the iteration variable; we'll use this several 7359 // times throughout. 7360 Expr *IterationVarRef 7361 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7362 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7363 7364 // Create the DeclStmt that holds the iteration variable. 7365 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7366 7367 // Create the comparison against the array bound. 7368 llvm::APInt Upper 7369 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7370 Expr *Comparison 7371 = new (S.Context) BinaryOperator(IterationVarRef, 7372 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7373 BO_NE, S.Context.BoolTy, 7374 VK_RValue, OK_Ordinary, Loc); 7375 7376 // Create the pre-increment of the iteration variable. 7377 Expr *Increment 7378 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7379 VK_LValue, OK_Ordinary, Loc); 7380 7381 // Subscript the "from" and "to" expressions with the iteration variable. 7382 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7383 IterationVarRef, Loc)); 7384 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7385 IterationVarRef, Loc)); 7386 if (!Copying) // Cast to rvalue 7387 From = CastForMoving(S, From); 7388 7389 // Build the copy/move for an individual element of the array. 7390 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7391 To, From, CopyingBaseSubobject, 7392 Copying, Depth + 1); 7393 if (Copy.isInvalid()) 7394 return StmtError(); 7395 7396 // Construct the loop that copies all elements of this array. 7397 return S.ActOnForStmt(Loc, Loc, InitStmt, 7398 S.MakeFullExpr(Comparison), 7399 0, S.MakeFullExpr(Increment), 7400 Loc, Copy.take()); 7401} 7402 7403std::pair<Sema::ImplicitExceptionSpecification, bool> 7404Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7405 CXXRecordDecl *ClassDecl) { 7406 if (ClassDecl->isInvalidDecl()) 7407 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7408 7409 // C++ [class.copy]p10: 7410 // If the class definition does not explicitly declare a copy 7411 // assignment operator, one is declared implicitly. 7412 // The implicitly-defined copy assignment operator for a class X 7413 // will have the form 7414 // 7415 // X& X::operator=(const X&) 7416 // 7417 // if 7418 bool HasConstCopyAssignment = true; 7419 7420 // -- each direct base class B of X has a copy assignment operator 7421 // whose parameter is of type const B&, const volatile B& or B, 7422 // and 7423 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7424 BaseEnd = ClassDecl->bases_end(); 7425 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7426 // We'll handle this below 7427 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7428 continue; 7429 7430 assert(!Base->getType()->isDependentType() && 7431 "Cannot generate implicit members for class with dependent bases."); 7432 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7433 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7434 &HasConstCopyAssignment); 7435 } 7436 7437 // In C++11, the above citation has "or virtual" added 7438 if (LangOpts.CPlusPlus0x) { 7439 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7440 BaseEnd = ClassDecl->vbases_end(); 7441 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7442 assert(!Base->getType()->isDependentType() && 7443 "Cannot generate implicit members for class with dependent bases."); 7444 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7445 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7446 &HasConstCopyAssignment); 7447 } 7448 } 7449 7450 // -- for all the nonstatic data members of X that are of a class 7451 // type M (or array thereof), each such class type has a copy 7452 // assignment operator whose parameter is of type const M&, 7453 // const volatile M& or M. 7454 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7455 FieldEnd = ClassDecl->field_end(); 7456 HasConstCopyAssignment && Field != FieldEnd; 7457 ++Field) { 7458 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7459 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7460 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7461 &HasConstCopyAssignment); 7462 } 7463 } 7464 7465 // Otherwise, the implicitly declared copy assignment operator will 7466 // have the form 7467 // 7468 // X& X::operator=(X&) 7469 7470 // C++ [except.spec]p14: 7471 // An implicitly declared special member function (Clause 12) shall have an 7472 // exception-specification. [...] 7473 7474 // It is unspecified whether or not an implicit copy assignment operator 7475 // attempts to deduplicate calls to assignment operators of virtual bases are 7476 // made. As such, this exception specification is effectively unspecified. 7477 // Based on a similar decision made for constness in C++0x, we're erring on 7478 // the side of assuming such calls to be made regardless of whether they 7479 // actually happen. 7480 ImplicitExceptionSpecification ExceptSpec(Context); 7481 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7482 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7483 BaseEnd = ClassDecl->bases_end(); 7484 Base != BaseEnd; ++Base) { 7485 if (Base->isVirtual()) 7486 continue; 7487 7488 CXXRecordDecl *BaseClassDecl 7489 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7490 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7491 ArgQuals, false, 0)) 7492 ExceptSpec.CalledDecl(CopyAssign); 7493 } 7494 7495 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7496 BaseEnd = ClassDecl->vbases_end(); 7497 Base != BaseEnd; ++Base) { 7498 CXXRecordDecl *BaseClassDecl 7499 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7500 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7501 ArgQuals, false, 0)) 7502 ExceptSpec.CalledDecl(CopyAssign); 7503 } 7504 7505 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7506 FieldEnd = ClassDecl->field_end(); 7507 Field != FieldEnd; 7508 ++Field) { 7509 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7510 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7511 if (CXXMethodDecl *CopyAssign = 7512 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7513 ExceptSpec.CalledDecl(CopyAssign); 7514 } 7515 } 7516 7517 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7518} 7519 7520CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7521 // Note: The following rules are largely analoguous to the copy 7522 // constructor rules. Note that virtual bases are not taken into account 7523 // for determining the argument type of the operator. Note also that 7524 // operators taking an object instead of a reference are allowed. 7525 7526 ImplicitExceptionSpecification Spec(Context); 7527 bool Const; 7528 llvm::tie(Spec, Const) = 7529 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7530 7531 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7532 QualType RetType = Context.getLValueReferenceType(ArgType); 7533 if (Const) 7534 ArgType = ArgType.withConst(); 7535 ArgType = Context.getLValueReferenceType(ArgType); 7536 7537 // An implicitly-declared copy assignment operator is an inline public 7538 // member of its class. 7539 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7540 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7541 SourceLocation ClassLoc = ClassDecl->getLocation(); 7542 DeclarationNameInfo NameInfo(Name, ClassLoc); 7543 CXXMethodDecl *CopyAssignment 7544 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7545 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7546 /*TInfo=*/0, /*isStatic=*/false, 7547 /*StorageClassAsWritten=*/SC_None, 7548 /*isInline=*/true, /*isConstexpr=*/false, 7549 SourceLocation()); 7550 CopyAssignment->setAccess(AS_public); 7551 CopyAssignment->setDefaulted(); 7552 CopyAssignment->setImplicit(); 7553 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7554 7555 // Add the parameter to the operator. 7556 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7557 ClassLoc, ClassLoc, /*Id=*/0, 7558 ArgType, /*TInfo=*/0, 7559 SC_None, 7560 SC_None, 0); 7561 CopyAssignment->setParams(FromParam); 7562 7563 // Note that we have added this copy-assignment operator. 7564 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7565 7566 if (Scope *S = getScopeForContext(ClassDecl)) 7567 PushOnScopeChains(CopyAssignment, S, false); 7568 ClassDecl->addDecl(CopyAssignment); 7569 7570 // C++0x [class.copy]p18: 7571 // ... If the class definition declares a move constructor or move 7572 // assignment operator, the implicitly declared copy assignment operator is 7573 // defined as deleted; ... 7574 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7575 ClassDecl->hasUserDeclaredMoveAssignment() || 7576 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7577 CopyAssignment->setDeletedAsWritten(); 7578 7579 AddOverriddenMethods(ClassDecl, CopyAssignment); 7580 return CopyAssignment; 7581} 7582 7583void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7584 CXXMethodDecl *CopyAssignOperator) { 7585 assert((CopyAssignOperator->isDefaulted() && 7586 CopyAssignOperator->isOverloadedOperator() && 7587 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7588 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7589 "DefineImplicitCopyAssignment called for wrong function"); 7590 7591 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7592 7593 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7594 CopyAssignOperator->setInvalidDecl(); 7595 return; 7596 } 7597 7598 CopyAssignOperator->setUsed(); 7599 7600 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7601 DiagnosticErrorTrap Trap(Diags); 7602 7603 // C++0x [class.copy]p30: 7604 // The implicitly-defined or explicitly-defaulted copy assignment operator 7605 // for a non-union class X performs memberwise copy assignment of its 7606 // subobjects. The direct base classes of X are assigned first, in the 7607 // order of their declaration in the base-specifier-list, and then the 7608 // immediate non-static data members of X are assigned, in the order in 7609 // which they were declared in the class definition. 7610 7611 // The statements that form the synthesized function body. 7612 ASTOwningVector<Stmt*> Statements(*this); 7613 7614 // The parameter for the "other" object, which we are copying from. 7615 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7616 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7617 QualType OtherRefType = Other->getType(); 7618 if (const LValueReferenceType *OtherRef 7619 = OtherRefType->getAs<LValueReferenceType>()) { 7620 OtherRefType = OtherRef->getPointeeType(); 7621 OtherQuals = OtherRefType.getQualifiers(); 7622 } 7623 7624 // Our location for everything implicitly-generated. 7625 SourceLocation Loc = CopyAssignOperator->getLocation(); 7626 7627 // Construct a reference to the "other" object. We'll be using this 7628 // throughout the generated ASTs. 7629 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7630 assert(OtherRef && "Reference to parameter cannot fail!"); 7631 7632 // Construct the "this" pointer. We'll be using this throughout the generated 7633 // ASTs. 7634 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7635 assert(This && "Reference to this cannot fail!"); 7636 7637 // Assign base classes. 7638 bool Invalid = false; 7639 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7640 E = ClassDecl->bases_end(); Base != E; ++Base) { 7641 // Form the assignment: 7642 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7643 QualType BaseType = Base->getType().getUnqualifiedType(); 7644 if (!BaseType->isRecordType()) { 7645 Invalid = true; 7646 continue; 7647 } 7648 7649 CXXCastPath BasePath; 7650 BasePath.push_back(Base); 7651 7652 // Construct the "from" expression, which is an implicit cast to the 7653 // appropriately-qualified base type. 7654 Expr *From = OtherRef; 7655 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7656 CK_UncheckedDerivedToBase, 7657 VK_LValue, &BasePath).take(); 7658 7659 // Dereference "this". 7660 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7661 7662 // Implicitly cast "this" to the appropriately-qualified base type. 7663 To = ImpCastExprToType(To.take(), 7664 Context.getCVRQualifiedType(BaseType, 7665 CopyAssignOperator->getTypeQualifiers()), 7666 CK_UncheckedDerivedToBase, 7667 VK_LValue, &BasePath); 7668 7669 // Build the copy. 7670 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7671 To.get(), From, 7672 /*CopyingBaseSubobject=*/true, 7673 /*Copying=*/true); 7674 if (Copy.isInvalid()) { 7675 Diag(CurrentLocation, diag::note_member_synthesized_at) 7676 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7677 CopyAssignOperator->setInvalidDecl(); 7678 return; 7679 } 7680 7681 // Success! Record the copy. 7682 Statements.push_back(Copy.takeAs<Expr>()); 7683 } 7684 7685 // \brief Reference to the __builtin_memcpy function. 7686 Expr *BuiltinMemCpyRef = 0; 7687 // \brief Reference to the __builtin_objc_memmove_collectable function. 7688 Expr *CollectableMemCpyRef = 0; 7689 7690 // Assign non-static members. 7691 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7692 FieldEnd = ClassDecl->field_end(); 7693 Field != FieldEnd; ++Field) { 7694 if (Field->isUnnamedBitfield()) 7695 continue; 7696 7697 // Check for members of reference type; we can't copy those. 7698 if (Field->getType()->isReferenceType()) { 7699 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7700 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7701 Diag(Field->getLocation(), diag::note_declared_at); 7702 Diag(CurrentLocation, diag::note_member_synthesized_at) 7703 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7704 Invalid = true; 7705 continue; 7706 } 7707 7708 // Check for members of const-qualified, non-class type. 7709 QualType BaseType = Context.getBaseElementType(Field->getType()); 7710 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7711 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7712 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7713 Diag(Field->getLocation(), diag::note_declared_at); 7714 Diag(CurrentLocation, diag::note_member_synthesized_at) 7715 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7716 Invalid = true; 7717 continue; 7718 } 7719 7720 // Suppress assigning zero-width bitfields. 7721 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7722 continue; 7723 7724 QualType FieldType = Field->getType().getNonReferenceType(); 7725 if (FieldType->isIncompleteArrayType()) { 7726 assert(ClassDecl->hasFlexibleArrayMember() && 7727 "Incomplete array type is not valid"); 7728 continue; 7729 } 7730 7731 // Build references to the field in the object we're copying from and to. 7732 CXXScopeSpec SS; // Intentionally empty 7733 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7734 LookupMemberName); 7735 MemberLookup.addDecl(*Field); 7736 MemberLookup.resolveKind(); 7737 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7738 Loc, /*IsArrow=*/false, 7739 SS, 0, MemberLookup, 0); 7740 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7741 Loc, /*IsArrow=*/true, 7742 SS, 0, MemberLookup, 0); 7743 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7744 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7745 7746 // If the field should be copied with __builtin_memcpy rather than via 7747 // explicit assignments, do so. This optimization only applies for arrays 7748 // of scalars and arrays of class type with trivial copy-assignment 7749 // operators. 7750 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7751 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7752 // Compute the size of the memory buffer to be copied. 7753 QualType SizeType = Context.getSizeType(); 7754 llvm::APInt Size(Context.getTypeSize(SizeType), 7755 Context.getTypeSizeInChars(BaseType).getQuantity()); 7756 for (const ConstantArrayType *Array 7757 = Context.getAsConstantArrayType(FieldType); 7758 Array; 7759 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7760 llvm::APInt ArraySize 7761 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7762 Size *= ArraySize; 7763 } 7764 7765 // Take the address of the field references for "from" and "to". 7766 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7767 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7768 7769 bool NeedsCollectableMemCpy = 7770 (BaseType->isRecordType() && 7771 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7772 7773 if (NeedsCollectableMemCpy) { 7774 if (!CollectableMemCpyRef) { 7775 // Create a reference to the __builtin_objc_memmove_collectable function. 7776 LookupResult R(*this, 7777 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7778 Loc, LookupOrdinaryName); 7779 LookupName(R, TUScope, true); 7780 7781 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7782 if (!CollectableMemCpy) { 7783 // Something went horribly wrong earlier, and we will have 7784 // complained about it. 7785 Invalid = true; 7786 continue; 7787 } 7788 7789 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7790 CollectableMemCpy->getType(), 7791 VK_LValue, Loc, 0).take(); 7792 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7793 } 7794 } 7795 // Create a reference to the __builtin_memcpy builtin function. 7796 else if (!BuiltinMemCpyRef) { 7797 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7798 LookupOrdinaryName); 7799 LookupName(R, TUScope, true); 7800 7801 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7802 if (!BuiltinMemCpy) { 7803 // Something went horribly wrong earlier, and we will have complained 7804 // about it. 7805 Invalid = true; 7806 continue; 7807 } 7808 7809 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7810 BuiltinMemCpy->getType(), 7811 VK_LValue, Loc, 0).take(); 7812 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7813 } 7814 7815 ASTOwningVector<Expr*> CallArgs(*this); 7816 CallArgs.push_back(To.takeAs<Expr>()); 7817 CallArgs.push_back(From.takeAs<Expr>()); 7818 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7819 ExprResult Call = ExprError(); 7820 if (NeedsCollectableMemCpy) 7821 Call = ActOnCallExpr(/*Scope=*/0, 7822 CollectableMemCpyRef, 7823 Loc, move_arg(CallArgs), 7824 Loc); 7825 else 7826 Call = ActOnCallExpr(/*Scope=*/0, 7827 BuiltinMemCpyRef, 7828 Loc, move_arg(CallArgs), 7829 Loc); 7830 7831 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7832 Statements.push_back(Call.takeAs<Expr>()); 7833 continue; 7834 } 7835 7836 // Build the copy of this field. 7837 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7838 To.get(), From.get(), 7839 /*CopyingBaseSubobject=*/false, 7840 /*Copying=*/true); 7841 if (Copy.isInvalid()) { 7842 Diag(CurrentLocation, diag::note_member_synthesized_at) 7843 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7844 CopyAssignOperator->setInvalidDecl(); 7845 return; 7846 } 7847 7848 // Success! Record the copy. 7849 Statements.push_back(Copy.takeAs<Stmt>()); 7850 } 7851 7852 if (!Invalid) { 7853 // Add a "return *this;" 7854 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7855 7856 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7857 if (Return.isInvalid()) 7858 Invalid = true; 7859 else { 7860 Statements.push_back(Return.takeAs<Stmt>()); 7861 7862 if (Trap.hasErrorOccurred()) { 7863 Diag(CurrentLocation, diag::note_member_synthesized_at) 7864 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7865 Invalid = true; 7866 } 7867 } 7868 } 7869 7870 if (Invalid) { 7871 CopyAssignOperator->setInvalidDecl(); 7872 return; 7873 } 7874 7875 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7876 /*isStmtExpr=*/false); 7877 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7878 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7879 7880 if (ASTMutationListener *L = getASTMutationListener()) { 7881 L->CompletedImplicitDefinition(CopyAssignOperator); 7882 } 7883} 7884 7885Sema::ImplicitExceptionSpecification 7886Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7887 ImplicitExceptionSpecification ExceptSpec(Context); 7888 7889 if (ClassDecl->isInvalidDecl()) 7890 return ExceptSpec; 7891 7892 // C++0x [except.spec]p14: 7893 // An implicitly declared special member function (Clause 12) shall have an 7894 // exception-specification. [...] 7895 7896 // It is unspecified whether or not an implicit move assignment operator 7897 // attempts to deduplicate calls to assignment operators of virtual bases are 7898 // made. As such, this exception specification is effectively unspecified. 7899 // Based on a similar decision made for constness in C++0x, we're erring on 7900 // the side of assuming such calls to be made regardless of whether they 7901 // actually happen. 7902 // Note that a move constructor is not implicitly declared when there are 7903 // virtual bases, but it can still be user-declared and explicitly defaulted. 7904 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7905 BaseEnd = ClassDecl->bases_end(); 7906 Base != BaseEnd; ++Base) { 7907 if (Base->isVirtual()) 7908 continue; 7909 7910 CXXRecordDecl *BaseClassDecl 7911 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7912 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7913 false, 0)) 7914 ExceptSpec.CalledDecl(MoveAssign); 7915 } 7916 7917 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7918 BaseEnd = ClassDecl->vbases_end(); 7919 Base != BaseEnd; ++Base) { 7920 CXXRecordDecl *BaseClassDecl 7921 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7922 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7923 false, 0)) 7924 ExceptSpec.CalledDecl(MoveAssign); 7925 } 7926 7927 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7928 FieldEnd = ClassDecl->field_end(); 7929 Field != FieldEnd; 7930 ++Field) { 7931 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7932 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7933 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7934 false, 0)) 7935 ExceptSpec.CalledDecl(MoveAssign); 7936 } 7937 } 7938 7939 return ExceptSpec; 7940} 7941 7942CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7943 // Note: The following rules are largely analoguous to the move 7944 // constructor rules. 7945 7946 ImplicitExceptionSpecification Spec( 7947 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7948 7949 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7950 QualType RetType = Context.getLValueReferenceType(ArgType); 7951 ArgType = Context.getRValueReferenceType(ArgType); 7952 7953 // An implicitly-declared move assignment operator is an inline public 7954 // member of its class. 7955 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7956 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7957 SourceLocation ClassLoc = ClassDecl->getLocation(); 7958 DeclarationNameInfo NameInfo(Name, ClassLoc); 7959 CXXMethodDecl *MoveAssignment 7960 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7961 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7962 /*TInfo=*/0, /*isStatic=*/false, 7963 /*StorageClassAsWritten=*/SC_None, 7964 /*isInline=*/true, 7965 /*isConstexpr=*/false, 7966 SourceLocation()); 7967 MoveAssignment->setAccess(AS_public); 7968 MoveAssignment->setDefaulted(); 7969 MoveAssignment->setImplicit(); 7970 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7971 7972 // Add the parameter to the operator. 7973 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7974 ClassLoc, ClassLoc, /*Id=*/0, 7975 ArgType, /*TInfo=*/0, 7976 SC_None, 7977 SC_None, 0); 7978 MoveAssignment->setParams(FromParam); 7979 7980 // Note that we have added this copy-assignment operator. 7981 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7982 7983 // C++0x [class.copy]p9: 7984 // If the definition of a class X does not explicitly declare a move 7985 // assignment operator, one will be implicitly declared as defaulted if and 7986 // only if: 7987 // [...] 7988 // - the move assignment operator would not be implicitly defined as 7989 // deleted. 7990 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7991 // Cache this result so that we don't try to generate this over and over 7992 // on every lookup, leaking memory and wasting time. 7993 ClassDecl->setFailedImplicitMoveAssignment(); 7994 return 0; 7995 } 7996 7997 if (Scope *S = getScopeForContext(ClassDecl)) 7998 PushOnScopeChains(MoveAssignment, S, false); 7999 ClassDecl->addDecl(MoveAssignment); 8000 8001 AddOverriddenMethods(ClassDecl, MoveAssignment); 8002 return MoveAssignment; 8003} 8004 8005void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8006 CXXMethodDecl *MoveAssignOperator) { 8007 assert((MoveAssignOperator->isDefaulted() && 8008 MoveAssignOperator->isOverloadedOperator() && 8009 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8010 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8011 "DefineImplicitMoveAssignment called for wrong function"); 8012 8013 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8014 8015 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8016 MoveAssignOperator->setInvalidDecl(); 8017 return; 8018 } 8019 8020 MoveAssignOperator->setUsed(); 8021 8022 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8023 DiagnosticErrorTrap Trap(Diags); 8024 8025 // C++0x [class.copy]p28: 8026 // The implicitly-defined or move assignment operator for a non-union class 8027 // X performs memberwise move assignment of its subobjects. The direct base 8028 // classes of X are assigned first, in the order of their declaration in the 8029 // base-specifier-list, and then the immediate non-static data members of X 8030 // are assigned, in the order in which they were declared in the class 8031 // definition. 8032 8033 // The statements that form the synthesized function body. 8034 ASTOwningVector<Stmt*> Statements(*this); 8035 8036 // The parameter for the "other" object, which we are move from. 8037 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8038 QualType OtherRefType = Other->getType()-> 8039 getAs<RValueReferenceType>()->getPointeeType(); 8040 assert(OtherRefType.getQualifiers() == 0 && 8041 "Bad argument type of defaulted move assignment"); 8042 8043 // Our location for everything implicitly-generated. 8044 SourceLocation Loc = MoveAssignOperator->getLocation(); 8045 8046 // Construct a reference to the "other" object. We'll be using this 8047 // throughout the generated ASTs. 8048 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8049 assert(OtherRef && "Reference to parameter cannot fail!"); 8050 // Cast to rvalue. 8051 OtherRef = CastForMoving(*this, OtherRef); 8052 8053 // Construct the "this" pointer. We'll be using this throughout the generated 8054 // ASTs. 8055 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8056 assert(This && "Reference to this cannot fail!"); 8057 8058 // Assign base classes. 8059 bool Invalid = false; 8060 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8061 E = ClassDecl->bases_end(); Base != E; ++Base) { 8062 // Form the assignment: 8063 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8064 QualType BaseType = Base->getType().getUnqualifiedType(); 8065 if (!BaseType->isRecordType()) { 8066 Invalid = true; 8067 continue; 8068 } 8069 8070 CXXCastPath BasePath; 8071 BasePath.push_back(Base); 8072 8073 // Construct the "from" expression, which is an implicit cast to the 8074 // appropriately-qualified base type. 8075 Expr *From = OtherRef; 8076 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8077 VK_XValue, &BasePath).take(); 8078 8079 // Dereference "this". 8080 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8081 8082 // Implicitly cast "this" to the appropriately-qualified base type. 8083 To = ImpCastExprToType(To.take(), 8084 Context.getCVRQualifiedType(BaseType, 8085 MoveAssignOperator->getTypeQualifiers()), 8086 CK_UncheckedDerivedToBase, 8087 VK_LValue, &BasePath); 8088 8089 // Build the move. 8090 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8091 To.get(), From, 8092 /*CopyingBaseSubobject=*/true, 8093 /*Copying=*/false); 8094 if (Move.isInvalid()) { 8095 Diag(CurrentLocation, diag::note_member_synthesized_at) 8096 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8097 MoveAssignOperator->setInvalidDecl(); 8098 return; 8099 } 8100 8101 // Success! Record the move. 8102 Statements.push_back(Move.takeAs<Expr>()); 8103 } 8104 8105 // \brief Reference to the __builtin_memcpy function. 8106 Expr *BuiltinMemCpyRef = 0; 8107 // \brief Reference to the __builtin_objc_memmove_collectable function. 8108 Expr *CollectableMemCpyRef = 0; 8109 8110 // Assign non-static members. 8111 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8112 FieldEnd = ClassDecl->field_end(); 8113 Field != FieldEnd; ++Field) { 8114 if (Field->isUnnamedBitfield()) 8115 continue; 8116 8117 // Check for members of reference type; we can't move those. 8118 if (Field->getType()->isReferenceType()) { 8119 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8120 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8121 Diag(Field->getLocation(), diag::note_declared_at); 8122 Diag(CurrentLocation, diag::note_member_synthesized_at) 8123 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8124 Invalid = true; 8125 continue; 8126 } 8127 8128 // Check for members of const-qualified, non-class type. 8129 QualType BaseType = Context.getBaseElementType(Field->getType()); 8130 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8131 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8132 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8133 Diag(Field->getLocation(), diag::note_declared_at); 8134 Diag(CurrentLocation, diag::note_member_synthesized_at) 8135 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8136 Invalid = true; 8137 continue; 8138 } 8139 8140 // Suppress assigning zero-width bitfields. 8141 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8142 continue; 8143 8144 QualType FieldType = Field->getType().getNonReferenceType(); 8145 if (FieldType->isIncompleteArrayType()) { 8146 assert(ClassDecl->hasFlexibleArrayMember() && 8147 "Incomplete array type is not valid"); 8148 continue; 8149 } 8150 8151 // Build references to the field in the object we're copying from and to. 8152 CXXScopeSpec SS; // Intentionally empty 8153 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8154 LookupMemberName); 8155 MemberLookup.addDecl(*Field); 8156 MemberLookup.resolveKind(); 8157 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8158 Loc, /*IsArrow=*/false, 8159 SS, 0, MemberLookup, 0); 8160 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8161 Loc, /*IsArrow=*/true, 8162 SS, 0, MemberLookup, 0); 8163 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8164 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8165 8166 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8167 "Member reference with rvalue base must be rvalue except for reference " 8168 "members, which aren't allowed for move assignment."); 8169 8170 // If the field should be copied with __builtin_memcpy rather than via 8171 // explicit assignments, do so. This optimization only applies for arrays 8172 // of scalars and arrays of class type with trivial move-assignment 8173 // operators. 8174 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8175 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8176 // Compute the size of the memory buffer to be copied. 8177 QualType SizeType = Context.getSizeType(); 8178 llvm::APInt Size(Context.getTypeSize(SizeType), 8179 Context.getTypeSizeInChars(BaseType).getQuantity()); 8180 for (const ConstantArrayType *Array 8181 = Context.getAsConstantArrayType(FieldType); 8182 Array; 8183 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8184 llvm::APInt ArraySize 8185 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8186 Size *= ArraySize; 8187 } 8188 8189 // Take the address of the field references for "from" and "to". We 8190 // directly construct UnaryOperators here because semantic analysis 8191 // does not permit us to take the address of an xvalue. 8192 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8193 Context.getPointerType(From.get()->getType()), 8194 VK_RValue, OK_Ordinary, Loc); 8195 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8196 Context.getPointerType(To.get()->getType()), 8197 VK_RValue, OK_Ordinary, Loc); 8198 8199 bool NeedsCollectableMemCpy = 8200 (BaseType->isRecordType() && 8201 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8202 8203 if (NeedsCollectableMemCpy) { 8204 if (!CollectableMemCpyRef) { 8205 // Create a reference to the __builtin_objc_memmove_collectable function. 8206 LookupResult R(*this, 8207 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8208 Loc, LookupOrdinaryName); 8209 LookupName(R, TUScope, true); 8210 8211 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8212 if (!CollectableMemCpy) { 8213 // Something went horribly wrong earlier, and we will have 8214 // complained about it. 8215 Invalid = true; 8216 continue; 8217 } 8218 8219 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8220 CollectableMemCpy->getType(), 8221 VK_LValue, Loc, 0).take(); 8222 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8223 } 8224 } 8225 // Create a reference to the __builtin_memcpy builtin function. 8226 else if (!BuiltinMemCpyRef) { 8227 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8228 LookupOrdinaryName); 8229 LookupName(R, TUScope, true); 8230 8231 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8232 if (!BuiltinMemCpy) { 8233 // Something went horribly wrong earlier, and we will have complained 8234 // about it. 8235 Invalid = true; 8236 continue; 8237 } 8238 8239 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8240 BuiltinMemCpy->getType(), 8241 VK_LValue, Loc, 0).take(); 8242 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8243 } 8244 8245 ASTOwningVector<Expr*> CallArgs(*this); 8246 CallArgs.push_back(To.takeAs<Expr>()); 8247 CallArgs.push_back(From.takeAs<Expr>()); 8248 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8249 ExprResult Call = ExprError(); 8250 if (NeedsCollectableMemCpy) 8251 Call = ActOnCallExpr(/*Scope=*/0, 8252 CollectableMemCpyRef, 8253 Loc, move_arg(CallArgs), 8254 Loc); 8255 else 8256 Call = ActOnCallExpr(/*Scope=*/0, 8257 BuiltinMemCpyRef, 8258 Loc, move_arg(CallArgs), 8259 Loc); 8260 8261 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8262 Statements.push_back(Call.takeAs<Expr>()); 8263 continue; 8264 } 8265 8266 // Build the move of this field. 8267 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8268 To.get(), From.get(), 8269 /*CopyingBaseSubobject=*/false, 8270 /*Copying=*/false); 8271 if (Move.isInvalid()) { 8272 Diag(CurrentLocation, diag::note_member_synthesized_at) 8273 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8274 MoveAssignOperator->setInvalidDecl(); 8275 return; 8276 } 8277 8278 // Success! Record the copy. 8279 Statements.push_back(Move.takeAs<Stmt>()); 8280 } 8281 8282 if (!Invalid) { 8283 // Add a "return *this;" 8284 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8285 8286 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8287 if (Return.isInvalid()) 8288 Invalid = true; 8289 else { 8290 Statements.push_back(Return.takeAs<Stmt>()); 8291 8292 if (Trap.hasErrorOccurred()) { 8293 Diag(CurrentLocation, diag::note_member_synthesized_at) 8294 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8295 Invalid = true; 8296 } 8297 } 8298 } 8299 8300 if (Invalid) { 8301 MoveAssignOperator->setInvalidDecl(); 8302 return; 8303 } 8304 8305 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8306 /*isStmtExpr=*/false); 8307 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8308 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8309 8310 if (ASTMutationListener *L = getASTMutationListener()) { 8311 L->CompletedImplicitDefinition(MoveAssignOperator); 8312 } 8313} 8314 8315std::pair<Sema::ImplicitExceptionSpecification, bool> 8316Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8317 if (ClassDecl->isInvalidDecl()) 8318 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8319 8320 // C++ [class.copy]p5: 8321 // The implicitly-declared copy constructor for a class X will 8322 // have the form 8323 // 8324 // X::X(const X&) 8325 // 8326 // if 8327 // FIXME: It ought to be possible to store this on the record. 8328 bool HasConstCopyConstructor = true; 8329 8330 // -- each direct or virtual base class B of X has a copy 8331 // constructor whose first parameter is of type const B& or 8332 // const volatile B&, and 8333 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8334 BaseEnd = ClassDecl->bases_end(); 8335 HasConstCopyConstructor && Base != BaseEnd; 8336 ++Base) { 8337 // Virtual bases are handled below. 8338 if (Base->isVirtual()) 8339 continue; 8340 8341 CXXRecordDecl *BaseClassDecl 8342 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8343 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8344 &HasConstCopyConstructor); 8345 } 8346 8347 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8348 BaseEnd = ClassDecl->vbases_end(); 8349 HasConstCopyConstructor && Base != BaseEnd; 8350 ++Base) { 8351 CXXRecordDecl *BaseClassDecl 8352 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8353 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8354 &HasConstCopyConstructor); 8355 } 8356 8357 // -- for all the nonstatic data members of X that are of a 8358 // class type M (or array thereof), each such class type 8359 // has a copy constructor whose first parameter is of type 8360 // const M& or const volatile M&. 8361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8362 FieldEnd = ClassDecl->field_end(); 8363 HasConstCopyConstructor && Field != FieldEnd; 8364 ++Field) { 8365 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8366 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8367 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8368 &HasConstCopyConstructor); 8369 } 8370 } 8371 // Otherwise, the implicitly declared copy constructor will have 8372 // the form 8373 // 8374 // X::X(X&) 8375 8376 // C++ [except.spec]p14: 8377 // An implicitly declared special member function (Clause 12) shall have an 8378 // exception-specification. [...] 8379 ImplicitExceptionSpecification ExceptSpec(Context); 8380 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8381 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8382 BaseEnd = ClassDecl->bases_end(); 8383 Base != BaseEnd; 8384 ++Base) { 8385 // Virtual bases are handled below. 8386 if (Base->isVirtual()) 8387 continue; 8388 8389 CXXRecordDecl *BaseClassDecl 8390 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8391 if (CXXConstructorDecl *CopyConstructor = 8392 LookupCopyingConstructor(BaseClassDecl, Quals)) 8393 ExceptSpec.CalledDecl(CopyConstructor); 8394 } 8395 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8396 BaseEnd = ClassDecl->vbases_end(); 8397 Base != BaseEnd; 8398 ++Base) { 8399 CXXRecordDecl *BaseClassDecl 8400 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8401 if (CXXConstructorDecl *CopyConstructor = 8402 LookupCopyingConstructor(BaseClassDecl, Quals)) 8403 ExceptSpec.CalledDecl(CopyConstructor); 8404 } 8405 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8406 FieldEnd = ClassDecl->field_end(); 8407 Field != FieldEnd; 8408 ++Field) { 8409 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8410 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8411 if (CXXConstructorDecl *CopyConstructor = 8412 LookupCopyingConstructor(FieldClassDecl, Quals)) 8413 ExceptSpec.CalledDecl(CopyConstructor); 8414 } 8415 } 8416 8417 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8418} 8419 8420CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8421 CXXRecordDecl *ClassDecl) { 8422 // C++ [class.copy]p4: 8423 // If the class definition does not explicitly declare a copy 8424 // constructor, one is declared implicitly. 8425 8426 ImplicitExceptionSpecification Spec(Context); 8427 bool Const; 8428 llvm::tie(Spec, Const) = 8429 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8430 8431 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8432 QualType ArgType = ClassType; 8433 if (Const) 8434 ArgType = ArgType.withConst(); 8435 ArgType = Context.getLValueReferenceType(ArgType); 8436 8437 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8438 8439 DeclarationName Name 8440 = Context.DeclarationNames.getCXXConstructorName( 8441 Context.getCanonicalType(ClassType)); 8442 SourceLocation ClassLoc = ClassDecl->getLocation(); 8443 DeclarationNameInfo NameInfo(Name, ClassLoc); 8444 8445 // An implicitly-declared copy constructor is an inline public 8446 // member of its class. 8447 CXXConstructorDecl *CopyConstructor 8448 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8449 Context.getFunctionType(Context.VoidTy, 8450 &ArgType, 1, EPI), 8451 /*TInfo=*/0, 8452 /*isExplicit=*/false, 8453 /*isInline=*/true, 8454 /*isImplicitlyDeclared=*/true, 8455 // FIXME: apply the rules for definitions here 8456 /*isConstexpr=*/false); 8457 CopyConstructor->setAccess(AS_public); 8458 CopyConstructor->setDefaulted(); 8459 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8460 8461 // Note that we have declared this constructor. 8462 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8463 8464 // Add the parameter to the constructor. 8465 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8466 ClassLoc, ClassLoc, 8467 /*IdentifierInfo=*/0, 8468 ArgType, /*TInfo=*/0, 8469 SC_None, 8470 SC_None, 0); 8471 CopyConstructor->setParams(FromParam); 8472 8473 if (Scope *S = getScopeForContext(ClassDecl)) 8474 PushOnScopeChains(CopyConstructor, S, false); 8475 ClassDecl->addDecl(CopyConstructor); 8476 8477 // C++0x [class.copy]p7: 8478 // ... If the class definition declares a move constructor or move 8479 // assignment operator, the implicitly declared constructor is defined as 8480 // deleted; ... 8481 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8482 ClassDecl->hasUserDeclaredMoveAssignment() || 8483 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8484 CopyConstructor->setDeletedAsWritten(); 8485 8486 return CopyConstructor; 8487} 8488 8489void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8490 CXXConstructorDecl *CopyConstructor) { 8491 assert((CopyConstructor->isDefaulted() && 8492 CopyConstructor->isCopyConstructor() && 8493 !CopyConstructor->doesThisDeclarationHaveABody()) && 8494 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8495 8496 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8497 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8498 8499 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8500 DiagnosticErrorTrap Trap(Diags); 8501 8502 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8503 Trap.hasErrorOccurred()) { 8504 Diag(CurrentLocation, diag::note_member_synthesized_at) 8505 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8506 CopyConstructor->setInvalidDecl(); 8507 } else { 8508 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8509 CopyConstructor->getLocation(), 8510 MultiStmtArg(*this, 0, 0), 8511 /*isStmtExpr=*/false) 8512 .takeAs<Stmt>()); 8513 CopyConstructor->setImplicitlyDefined(true); 8514 } 8515 8516 CopyConstructor->setUsed(); 8517 if (ASTMutationListener *L = getASTMutationListener()) { 8518 L->CompletedImplicitDefinition(CopyConstructor); 8519 } 8520} 8521 8522Sema::ImplicitExceptionSpecification 8523Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8524 // C++ [except.spec]p14: 8525 // An implicitly declared special member function (Clause 12) shall have an 8526 // exception-specification. [...] 8527 ImplicitExceptionSpecification ExceptSpec(Context); 8528 if (ClassDecl->isInvalidDecl()) 8529 return ExceptSpec; 8530 8531 // Direct base-class constructors. 8532 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8533 BEnd = ClassDecl->bases_end(); 8534 B != BEnd; ++B) { 8535 if (B->isVirtual()) // Handled below. 8536 continue; 8537 8538 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8539 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8540 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8541 // If this is a deleted function, add it anyway. This might be conformant 8542 // with the standard. This might not. I'm not sure. It might not matter. 8543 if (Constructor) 8544 ExceptSpec.CalledDecl(Constructor); 8545 } 8546 } 8547 8548 // Virtual base-class constructors. 8549 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8550 BEnd = ClassDecl->vbases_end(); 8551 B != BEnd; ++B) { 8552 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8553 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8554 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8555 // If this is a deleted function, add it anyway. This might be conformant 8556 // with the standard. This might not. I'm not sure. It might not matter. 8557 if (Constructor) 8558 ExceptSpec.CalledDecl(Constructor); 8559 } 8560 } 8561 8562 // Field constructors. 8563 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8564 FEnd = ClassDecl->field_end(); 8565 F != FEnd; ++F) { 8566 if (F->hasInClassInitializer()) { 8567 if (Expr *E = F->getInClassInitializer()) 8568 ExceptSpec.CalledExpr(E); 8569 else if (!F->isInvalidDecl()) 8570 ExceptSpec.SetDelayed(); 8571 } else if (const RecordType *RecordTy 8572 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8573 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8574 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8575 // If this is a deleted function, add it anyway. This might be conformant 8576 // with the standard. This might not. I'm not sure. It might not matter. 8577 // In particular, the problem is that this function never gets called. It 8578 // might just be ill-formed because this function attempts to refer to 8579 // a deleted function here. 8580 if (Constructor) 8581 ExceptSpec.CalledDecl(Constructor); 8582 } 8583 } 8584 8585 return ExceptSpec; 8586} 8587 8588CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8589 CXXRecordDecl *ClassDecl) { 8590 ImplicitExceptionSpecification Spec( 8591 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8592 8593 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8594 QualType ArgType = Context.getRValueReferenceType(ClassType); 8595 8596 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8597 8598 DeclarationName Name 8599 = Context.DeclarationNames.getCXXConstructorName( 8600 Context.getCanonicalType(ClassType)); 8601 SourceLocation ClassLoc = ClassDecl->getLocation(); 8602 DeclarationNameInfo NameInfo(Name, ClassLoc); 8603 8604 // C++0x [class.copy]p11: 8605 // An implicitly-declared copy/move constructor is an inline public 8606 // member of its class. 8607 CXXConstructorDecl *MoveConstructor 8608 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8609 Context.getFunctionType(Context.VoidTy, 8610 &ArgType, 1, EPI), 8611 /*TInfo=*/0, 8612 /*isExplicit=*/false, 8613 /*isInline=*/true, 8614 /*isImplicitlyDeclared=*/true, 8615 // FIXME: apply the rules for definitions here 8616 /*isConstexpr=*/false); 8617 MoveConstructor->setAccess(AS_public); 8618 MoveConstructor->setDefaulted(); 8619 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8620 8621 // Add the parameter to the constructor. 8622 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8623 ClassLoc, ClassLoc, 8624 /*IdentifierInfo=*/0, 8625 ArgType, /*TInfo=*/0, 8626 SC_None, 8627 SC_None, 0); 8628 MoveConstructor->setParams(FromParam); 8629 8630 // C++0x [class.copy]p9: 8631 // If the definition of a class X does not explicitly declare a move 8632 // constructor, one will be implicitly declared as defaulted if and only if: 8633 // [...] 8634 // - the move constructor would not be implicitly defined as deleted. 8635 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8636 // Cache this result so that we don't try to generate this over and over 8637 // on every lookup, leaking memory and wasting time. 8638 ClassDecl->setFailedImplicitMoveConstructor(); 8639 return 0; 8640 } 8641 8642 // Note that we have declared this constructor. 8643 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8644 8645 if (Scope *S = getScopeForContext(ClassDecl)) 8646 PushOnScopeChains(MoveConstructor, S, false); 8647 ClassDecl->addDecl(MoveConstructor); 8648 8649 return MoveConstructor; 8650} 8651 8652void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8653 CXXConstructorDecl *MoveConstructor) { 8654 assert((MoveConstructor->isDefaulted() && 8655 MoveConstructor->isMoveConstructor() && 8656 !MoveConstructor->doesThisDeclarationHaveABody()) && 8657 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8658 8659 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8660 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8661 8662 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8663 DiagnosticErrorTrap Trap(Diags); 8664 8665 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8666 Trap.hasErrorOccurred()) { 8667 Diag(CurrentLocation, diag::note_member_synthesized_at) 8668 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8669 MoveConstructor->setInvalidDecl(); 8670 } else { 8671 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8672 MoveConstructor->getLocation(), 8673 MultiStmtArg(*this, 0, 0), 8674 /*isStmtExpr=*/false) 8675 .takeAs<Stmt>()); 8676 MoveConstructor->setImplicitlyDefined(true); 8677 } 8678 8679 MoveConstructor->setUsed(); 8680 8681 if (ASTMutationListener *L = getASTMutationListener()) { 8682 L->CompletedImplicitDefinition(MoveConstructor); 8683 } 8684} 8685 8686ExprResult 8687Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8688 CXXConstructorDecl *Constructor, 8689 MultiExprArg ExprArgs, 8690 bool HadMultipleCandidates, 8691 bool RequiresZeroInit, 8692 unsigned ConstructKind, 8693 SourceRange ParenRange) { 8694 bool Elidable = false; 8695 8696 // C++0x [class.copy]p34: 8697 // When certain criteria are met, an implementation is allowed to 8698 // omit the copy/move construction of a class object, even if the 8699 // copy/move constructor and/or destructor for the object have 8700 // side effects. [...] 8701 // - when a temporary class object that has not been bound to a 8702 // reference (12.2) would be copied/moved to a class object 8703 // with the same cv-unqualified type, the copy/move operation 8704 // can be omitted by constructing the temporary object 8705 // directly into the target of the omitted copy/move 8706 if (ConstructKind == CXXConstructExpr::CK_Complete && 8707 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8708 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8709 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8710 } 8711 8712 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8713 Elidable, move(ExprArgs), HadMultipleCandidates, 8714 RequiresZeroInit, ConstructKind, ParenRange); 8715} 8716 8717/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8718/// including handling of its default argument expressions. 8719ExprResult 8720Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8721 CXXConstructorDecl *Constructor, bool Elidable, 8722 MultiExprArg ExprArgs, 8723 bool HadMultipleCandidates, 8724 bool RequiresZeroInit, 8725 unsigned ConstructKind, 8726 SourceRange ParenRange) { 8727 unsigned NumExprs = ExprArgs.size(); 8728 Expr **Exprs = (Expr **)ExprArgs.release(); 8729 8730 for (specific_attr_iterator<NonNullAttr> 8731 i = Constructor->specific_attr_begin<NonNullAttr>(), 8732 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8733 const NonNullAttr *NonNull = *i; 8734 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8735 } 8736 8737 MarkDeclarationReferenced(ConstructLoc, Constructor); 8738 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8739 Constructor, Elidable, Exprs, NumExprs, 8740 HadMultipleCandidates, RequiresZeroInit, 8741 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8742 ParenRange)); 8743} 8744 8745bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8746 CXXConstructorDecl *Constructor, 8747 MultiExprArg Exprs, 8748 bool HadMultipleCandidates) { 8749 // FIXME: Provide the correct paren SourceRange when available. 8750 ExprResult TempResult = 8751 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8752 move(Exprs), HadMultipleCandidates, false, 8753 CXXConstructExpr::CK_Complete, SourceRange()); 8754 if (TempResult.isInvalid()) 8755 return true; 8756 8757 Expr *Temp = TempResult.takeAs<Expr>(); 8758 CheckImplicitConversions(Temp, VD->getLocation()); 8759 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8760 Temp = MaybeCreateExprWithCleanups(Temp); 8761 VD->setInit(Temp); 8762 8763 return false; 8764} 8765 8766void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8767 if (VD->isInvalidDecl()) return; 8768 8769 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8770 if (ClassDecl->isInvalidDecl()) return; 8771 if (ClassDecl->hasTrivialDestructor()) return; 8772 if (ClassDecl->isDependentContext()) return; 8773 8774 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8775 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8776 CheckDestructorAccess(VD->getLocation(), Destructor, 8777 PDiag(diag::err_access_dtor_var) 8778 << VD->getDeclName() 8779 << VD->getType()); 8780 8781 if (!VD->hasGlobalStorage()) return; 8782 8783 // Emit warning for non-trivial dtor in global scope (a real global, 8784 // class-static, function-static). 8785 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8786 8787 // TODO: this should be re-enabled for static locals by !CXAAtExit 8788 if (!VD->isStaticLocal()) 8789 Diag(VD->getLocation(), diag::warn_global_destructor); 8790} 8791 8792/// AddCXXDirectInitializerToDecl - This action is called immediately after 8793/// ActOnDeclarator, when a C++ direct initializer is present. 8794/// e.g: "int x(1);" 8795void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8796 SourceLocation LParenLoc, 8797 MultiExprArg Exprs, 8798 SourceLocation RParenLoc, 8799 bool TypeMayContainAuto) { 8800 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8801 8802 // If there is no declaration, there was an error parsing it. Just ignore 8803 // the initializer. 8804 if (RealDecl == 0) 8805 return; 8806 8807 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8808 if (!VDecl) { 8809 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8810 RealDecl->setInvalidDecl(); 8811 return; 8812 } 8813 8814 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8815 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8816 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8817 if (Exprs.size() > 1) { 8818 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8819 diag::err_auto_var_init_multiple_expressions) 8820 << VDecl->getDeclName() << VDecl->getType() 8821 << VDecl->getSourceRange(); 8822 RealDecl->setInvalidDecl(); 8823 return; 8824 } 8825 8826 Expr *Init = Exprs.get()[0]; 8827 TypeSourceInfo *DeducedType = 0; 8828 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8829 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8830 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8831 << Init->getSourceRange(); 8832 if (!DeducedType) { 8833 RealDecl->setInvalidDecl(); 8834 return; 8835 } 8836 VDecl->setTypeSourceInfo(DeducedType); 8837 VDecl->setType(DeducedType->getType()); 8838 8839 // In ARC, infer lifetime. 8840 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8841 VDecl->setInvalidDecl(); 8842 8843 // If this is a redeclaration, check that the type we just deduced matches 8844 // the previously declared type. 8845 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8846 MergeVarDeclTypes(VDecl, Old); 8847 } 8848 8849 // We will represent direct-initialization similarly to copy-initialization: 8850 // int x(1); -as-> int x = 1; 8851 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8852 // 8853 // Clients that want to distinguish between the two forms, can check for 8854 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8855 // A major benefit is that clients that don't particularly care about which 8856 // exactly form was it (like the CodeGen) can handle both cases without 8857 // special case code. 8858 8859 // C++ 8.5p11: 8860 // The form of initialization (using parentheses or '=') is generally 8861 // insignificant, but does matter when the entity being initialized has a 8862 // class type. 8863 8864 if (!VDecl->getType()->isDependentType() && 8865 !VDecl->getType()->isIncompleteArrayType() && 8866 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8867 diag::err_typecheck_decl_incomplete_type)) { 8868 VDecl->setInvalidDecl(); 8869 return; 8870 } 8871 8872 // The variable can not have an abstract class type. 8873 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8874 diag::err_abstract_type_in_decl, 8875 AbstractVariableType)) 8876 VDecl->setInvalidDecl(); 8877 8878 const VarDecl *Def; 8879 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8880 Diag(VDecl->getLocation(), diag::err_redefinition) 8881 << VDecl->getDeclName(); 8882 Diag(Def->getLocation(), diag::note_previous_definition); 8883 VDecl->setInvalidDecl(); 8884 return; 8885 } 8886 8887 // C++ [class.static.data]p4 8888 // If a static data member is of const integral or const 8889 // enumeration type, its declaration in the class definition can 8890 // specify a constant-initializer which shall be an integral 8891 // constant expression (5.19). In that case, the member can appear 8892 // in integral constant expressions. The member shall still be 8893 // defined in a namespace scope if it is used in the program and the 8894 // namespace scope definition shall not contain an initializer. 8895 // 8896 // We already performed a redefinition check above, but for static 8897 // data members we also need to check whether there was an in-class 8898 // declaration with an initializer. 8899 const VarDecl* PrevInit = 0; 8900 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8901 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8902 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8903 return; 8904 } 8905 8906 bool IsDependent = false; 8907 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8908 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8909 VDecl->setInvalidDecl(); 8910 return; 8911 } 8912 8913 if (Exprs.get()[I]->isTypeDependent()) 8914 IsDependent = true; 8915 } 8916 8917 // If either the declaration has a dependent type or if any of the 8918 // expressions is type-dependent, we represent the initialization 8919 // via a ParenListExpr for later use during template instantiation. 8920 if (VDecl->getType()->isDependentType() || IsDependent) { 8921 // Let clients know that initialization was done with a direct initializer. 8922 VDecl->setCXXDirectInitializer(true); 8923 8924 // Store the initialization expressions as a ParenListExpr. 8925 unsigned NumExprs = Exprs.size(); 8926 VDecl->setInit(new (Context) ParenListExpr( 8927 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8928 VDecl->getType().getNonReferenceType())); 8929 return; 8930 } 8931 8932 // Capture the variable that is being initialized and the style of 8933 // initialization. 8934 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8935 8936 // FIXME: Poor source location information. 8937 InitializationKind Kind 8938 = InitializationKind::CreateDirect(VDecl->getLocation(), 8939 LParenLoc, RParenLoc); 8940 8941 QualType T = VDecl->getType(); 8942 InitializationSequence InitSeq(*this, Entity, Kind, 8943 Exprs.get(), Exprs.size()); 8944 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8945 if (Result.isInvalid()) { 8946 VDecl->setInvalidDecl(); 8947 return; 8948 } else if (T != VDecl->getType()) { 8949 VDecl->setType(T); 8950 Result.get()->setType(T); 8951 } 8952 8953 8954 Expr *Init = Result.get(); 8955 CheckImplicitConversions(Init, LParenLoc); 8956 8957 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 8958 !Init->isValueDependent() && 8959 !Init->isConstantInitializer(Context, 8960 VDecl->getType()->isReferenceType())) { 8961 // FIXME: Improve this diagnostic to explain why the initializer is not 8962 // a constant expression. 8963 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 8964 << VDecl << Init->getSourceRange(); 8965 } 8966 8967 Init = MaybeCreateExprWithCleanups(Init); 8968 VDecl->setInit(Init); 8969 VDecl->setCXXDirectInitializer(true); 8970 8971 CheckCompleteVariableDeclaration(VDecl); 8972} 8973 8974/// \brief Given a constructor and the set of arguments provided for the 8975/// constructor, convert the arguments and add any required default arguments 8976/// to form a proper call to this constructor. 8977/// 8978/// \returns true if an error occurred, false otherwise. 8979bool 8980Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8981 MultiExprArg ArgsPtr, 8982 SourceLocation Loc, 8983 ASTOwningVector<Expr*> &ConvertedArgs) { 8984 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8985 unsigned NumArgs = ArgsPtr.size(); 8986 Expr **Args = (Expr **)ArgsPtr.get(); 8987 8988 const FunctionProtoType *Proto 8989 = Constructor->getType()->getAs<FunctionProtoType>(); 8990 assert(Proto && "Constructor without a prototype?"); 8991 unsigned NumArgsInProto = Proto->getNumArgs(); 8992 8993 // If too few arguments are available, we'll fill in the rest with defaults. 8994 if (NumArgs < NumArgsInProto) 8995 ConvertedArgs.reserve(NumArgsInProto); 8996 else 8997 ConvertedArgs.reserve(NumArgs); 8998 8999 VariadicCallType CallType = 9000 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9001 SmallVector<Expr *, 8> AllArgs; 9002 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9003 Proto, 0, Args, NumArgs, AllArgs, 9004 CallType); 9005 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9006 ConvertedArgs.push_back(AllArgs[i]); 9007 return Invalid; 9008} 9009 9010static inline bool 9011CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9012 const FunctionDecl *FnDecl) { 9013 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9014 if (isa<NamespaceDecl>(DC)) { 9015 return SemaRef.Diag(FnDecl->getLocation(), 9016 diag::err_operator_new_delete_declared_in_namespace) 9017 << FnDecl->getDeclName(); 9018 } 9019 9020 if (isa<TranslationUnitDecl>(DC) && 9021 FnDecl->getStorageClass() == SC_Static) { 9022 return SemaRef.Diag(FnDecl->getLocation(), 9023 diag::err_operator_new_delete_declared_static) 9024 << FnDecl->getDeclName(); 9025 } 9026 9027 return false; 9028} 9029 9030static inline bool 9031CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9032 CanQualType ExpectedResultType, 9033 CanQualType ExpectedFirstParamType, 9034 unsigned DependentParamTypeDiag, 9035 unsigned InvalidParamTypeDiag) { 9036 QualType ResultType = 9037 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9038 9039 // Check that the result type is not dependent. 9040 if (ResultType->isDependentType()) 9041 return SemaRef.Diag(FnDecl->getLocation(), 9042 diag::err_operator_new_delete_dependent_result_type) 9043 << FnDecl->getDeclName() << ExpectedResultType; 9044 9045 // Check that the result type is what we expect. 9046 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9047 return SemaRef.Diag(FnDecl->getLocation(), 9048 diag::err_operator_new_delete_invalid_result_type) 9049 << FnDecl->getDeclName() << ExpectedResultType; 9050 9051 // A function template must have at least 2 parameters. 9052 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9053 return SemaRef.Diag(FnDecl->getLocation(), 9054 diag::err_operator_new_delete_template_too_few_parameters) 9055 << FnDecl->getDeclName(); 9056 9057 // The function decl must have at least 1 parameter. 9058 if (FnDecl->getNumParams() == 0) 9059 return SemaRef.Diag(FnDecl->getLocation(), 9060 diag::err_operator_new_delete_too_few_parameters) 9061 << FnDecl->getDeclName(); 9062 9063 // Check the the first parameter type is not dependent. 9064 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9065 if (FirstParamType->isDependentType()) 9066 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9067 << FnDecl->getDeclName() << ExpectedFirstParamType; 9068 9069 // Check that the first parameter type is what we expect. 9070 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9071 ExpectedFirstParamType) 9072 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9073 << FnDecl->getDeclName() << ExpectedFirstParamType; 9074 9075 return false; 9076} 9077 9078static bool 9079CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9080 // C++ [basic.stc.dynamic.allocation]p1: 9081 // A program is ill-formed if an allocation function is declared in a 9082 // namespace scope other than global scope or declared static in global 9083 // scope. 9084 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9085 return true; 9086 9087 CanQualType SizeTy = 9088 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9089 9090 // C++ [basic.stc.dynamic.allocation]p1: 9091 // The return type shall be void*. The first parameter shall have type 9092 // std::size_t. 9093 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9094 SizeTy, 9095 diag::err_operator_new_dependent_param_type, 9096 diag::err_operator_new_param_type)) 9097 return true; 9098 9099 // C++ [basic.stc.dynamic.allocation]p1: 9100 // The first parameter shall not have an associated default argument. 9101 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9102 return SemaRef.Diag(FnDecl->getLocation(), 9103 diag::err_operator_new_default_arg) 9104 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9105 9106 return false; 9107} 9108 9109static bool 9110CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9111 // C++ [basic.stc.dynamic.deallocation]p1: 9112 // A program is ill-formed if deallocation functions are declared in a 9113 // namespace scope other than global scope or declared static in global 9114 // scope. 9115 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9116 return true; 9117 9118 // C++ [basic.stc.dynamic.deallocation]p2: 9119 // Each deallocation function shall return void and its first parameter 9120 // shall be void*. 9121 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9122 SemaRef.Context.VoidPtrTy, 9123 diag::err_operator_delete_dependent_param_type, 9124 diag::err_operator_delete_param_type)) 9125 return true; 9126 9127 return false; 9128} 9129 9130/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9131/// of this overloaded operator is well-formed. If so, returns false; 9132/// otherwise, emits appropriate diagnostics and returns true. 9133bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9134 assert(FnDecl && FnDecl->isOverloadedOperator() && 9135 "Expected an overloaded operator declaration"); 9136 9137 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9138 9139 // C++ [over.oper]p5: 9140 // The allocation and deallocation functions, operator new, 9141 // operator new[], operator delete and operator delete[], are 9142 // described completely in 3.7.3. The attributes and restrictions 9143 // found in the rest of this subclause do not apply to them unless 9144 // explicitly stated in 3.7.3. 9145 if (Op == OO_Delete || Op == OO_Array_Delete) 9146 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9147 9148 if (Op == OO_New || Op == OO_Array_New) 9149 return CheckOperatorNewDeclaration(*this, FnDecl); 9150 9151 // C++ [over.oper]p6: 9152 // An operator function shall either be a non-static member 9153 // function or be a non-member function and have at least one 9154 // parameter whose type is a class, a reference to a class, an 9155 // enumeration, or a reference to an enumeration. 9156 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9157 if (MethodDecl->isStatic()) 9158 return Diag(FnDecl->getLocation(), 9159 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9160 } else { 9161 bool ClassOrEnumParam = false; 9162 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9163 ParamEnd = FnDecl->param_end(); 9164 Param != ParamEnd; ++Param) { 9165 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9166 if (ParamType->isDependentType() || ParamType->isRecordType() || 9167 ParamType->isEnumeralType()) { 9168 ClassOrEnumParam = true; 9169 break; 9170 } 9171 } 9172 9173 if (!ClassOrEnumParam) 9174 return Diag(FnDecl->getLocation(), 9175 diag::err_operator_overload_needs_class_or_enum) 9176 << FnDecl->getDeclName(); 9177 } 9178 9179 // C++ [over.oper]p8: 9180 // An operator function cannot have default arguments (8.3.6), 9181 // except where explicitly stated below. 9182 // 9183 // Only the function-call operator allows default arguments 9184 // (C++ [over.call]p1). 9185 if (Op != OO_Call) { 9186 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9187 Param != FnDecl->param_end(); ++Param) { 9188 if ((*Param)->hasDefaultArg()) 9189 return Diag((*Param)->getLocation(), 9190 diag::err_operator_overload_default_arg) 9191 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9192 } 9193 } 9194 9195 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9196 { false, false, false } 9197#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9198 , { Unary, Binary, MemberOnly } 9199#include "clang/Basic/OperatorKinds.def" 9200 }; 9201 9202 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9203 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9204 bool MustBeMemberOperator = OperatorUses[Op][2]; 9205 9206 // C++ [over.oper]p8: 9207 // [...] Operator functions cannot have more or fewer parameters 9208 // than the number required for the corresponding operator, as 9209 // described in the rest of this subclause. 9210 unsigned NumParams = FnDecl->getNumParams() 9211 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9212 if (Op != OO_Call && 9213 ((NumParams == 1 && !CanBeUnaryOperator) || 9214 (NumParams == 2 && !CanBeBinaryOperator) || 9215 (NumParams < 1) || (NumParams > 2))) { 9216 // We have the wrong number of parameters. 9217 unsigned ErrorKind; 9218 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9219 ErrorKind = 2; // 2 -> unary or binary. 9220 } else if (CanBeUnaryOperator) { 9221 ErrorKind = 0; // 0 -> unary 9222 } else { 9223 assert(CanBeBinaryOperator && 9224 "All non-call overloaded operators are unary or binary!"); 9225 ErrorKind = 1; // 1 -> binary 9226 } 9227 9228 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9229 << FnDecl->getDeclName() << NumParams << ErrorKind; 9230 } 9231 9232 // Overloaded operators other than operator() cannot be variadic. 9233 if (Op != OO_Call && 9234 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9235 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9236 << FnDecl->getDeclName(); 9237 } 9238 9239 // Some operators must be non-static member functions. 9240 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9241 return Diag(FnDecl->getLocation(), 9242 diag::err_operator_overload_must_be_member) 9243 << FnDecl->getDeclName(); 9244 } 9245 9246 // C++ [over.inc]p1: 9247 // The user-defined function called operator++ implements the 9248 // prefix and postfix ++ operator. If this function is a member 9249 // function with no parameters, or a non-member function with one 9250 // parameter of class or enumeration type, it defines the prefix 9251 // increment operator ++ for objects of that type. If the function 9252 // is a member function with one parameter (which shall be of type 9253 // int) or a non-member function with two parameters (the second 9254 // of which shall be of type int), it defines the postfix 9255 // increment operator ++ for objects of that type. 9256 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9257 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9258 bool ParamIsInt = false; 9259 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9260 ParamIsInt = BT->getKind() == BuiltinType::Int; 9261 9262 if (!ParamIsInt) 9263 return Diag(LastParam->getLocation(), 9264 diag::err_operator_overload_post_incdec_must_be_int) 9265 << LastParam->getType() << (Op == OO_MinusMinus); 9266 } 9267 9268 return false; 9269} 9270 9271/// CheckLiteralOperatorDeclaration - Check whether the declaration 9272/// of this literal operator function is well-formed. If so, returns 9273/// false; otherwise, emits appropriate diagnostics and returns true. 9274bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9275 DeclContext *DC = FnDecl->getDeclContext(); 9276 Decl::Kind Kind = DC->getDeclKind(); 9277 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9278 Kind != Decl::LinkageSpec) { 9279 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9280 << FnDecl->getDeclName(); 9281 return true; 9282 } 9283 9284 bool Valid = false; 9285 9286 // template <char...> type operator "" name() is the only valid template 9287 // signature, and the only valid signature with no parameters. 9288 if (FnDecl->param_size() == 0) { 9289 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9290 // Must have only one template parameter 9291 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9292 if (Params->size() == 1) { 9293 NonTypeTemplateParmDecl *PmDecl = 9294 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9295 9296 // The template parameter must be a char parameter pack. 9297 if (PmDecl && PmDecl->isTemplateParameterPack() && 9298 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9299 Valid = true; 9300 } 9301 } 9302 } else { 9303 // Check the first parameter 9304 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9305 9306 QualType T = (*Param)->getType(); 9307 9308 // unsigned long long int, long double, and any character type are allowed 9309 // as the only parameters. 9310 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9311 Context.hasSameType(T, Context.LongDoubleTy) || 9312 Context.hasSameType(T, Context.CharTy) || 9313 Context.hasSameType(T, Context.WCharTy) || 9314 Context.hasSameType(T, Context.Char16Ty) || 9315 Context.hasSameType(T, Context.Char32Ty)) { 9316 if (++Param == FnDecl->param_end()) 9317 Valid = true; 9318 goto FinishedParams; 9319 } 9320 9321 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9322 const PointerType *PT = T->getAs<PointerType>(); 9323 if (!PT) 9324 goto FinishedParams; 9325 T = PT->getPointeeType(); 9326 if (!T.isConstQualified()) 9327 goto FinishedParams; 9328 T = T.getUnqualifiedType(); 9329 9330 // Move on to the second parameter; 9331 ++Param; 9332 9333 // If there is no second parameter, the first must be a const char * 9334 if (Param == FnDecl->param_end()) { 9335 if (Context.hasSameType(T, Context.CharTy)) 9336 Valid = true; 9337 goto FinishedParams; 9338 } 9339 9340 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9341 // are allowed as the first parameter to a two-parameter function 9342 if (!(Context.hasSameType(T, Context.CharTy) || 9343 Context.hasSameType(T, Context.WCharTy) || 9344 Context.hasSameType(T, Context.Char16Ty) || 9345 Context.hasSameType(T, Context.Char32Ty))) 9346 goto FinishedParams; 9347 9348 // The second and final parameter must be an std::size_t 9349 T = (*Param)->getType().getUnqualifiedType(); 9350 if (Context.hasSameType(T, Context.getSizeType()) && 9351 ++Param == FnDecl->param_end()) 9352 Valid = true; 9353 } 9354 9355 // FIXME: This diagnostic is absolutely terrible. 9356FinishedParams: 9357 if (!Valid) { 9358 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9359 << FnDecl->getDeclName(); 9360 return true; 9361 } 9362 9363 StringRef LiteralName 9364 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9365 if (LiteralName[0] != '_') { 9366 // C++0x [usrlit.suffix]p1: 9367 // Literal suffix identifiers that do not start with an underscore are 9368 // reserved for future standardization. 9369 bool IsHexFloat = true; 9370 if (LiteralName.size() > 1 && 9371 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9372 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9373 if (!isdigit(LiteralName[I])) { 9374 IsHexFloat = false; 9375 break; 9376 } 9377 } 9378 } 9379 9380 if (IsHexFloat) 9381 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9382 << LiteralName; 9383 else 9384 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9385 } 9386 9387 return false; 9388} 9389 9390/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9391/// linkage specification, including the language and (if present) 9392/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9393/// the location of the language string literal, which is provided 9394/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9395/// the '{' brace. Otherwise, this linkage specification does not 9396/// have any braces. 9397Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9398 SourceLocation LangLoc, 9399 StringRef Lang, 9400 SourceLocation LBraceLoc) { 9401 LinkageSpecDecl::LanguageIDs Language; 9402 if (Lang == "\"C\"") 9403 Language = LinkageSpecDecl::lang_c; 9404 else if (Lang == "\"C++\"") 9405 Language = LinkageSpecDecl::lang_cxx; 9406 else { 9407 Diag(LangLoc, diag::err_bad_language); 9408 return 0; 9409 } 9410 9411 // FIXME: Add all the various semantics of linkage specifications 9412 9413 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9414 ExternLoc, LangLoc, Language); 9415 CurContext->addDecl(D); 9416 PushDeclContext(S, D); 9417 return D; 9418} 9419 9420/// ActOnFinishLinkageSpecification - Complete the definition of 9421/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9422/// valid, it's the position of the closing '}' brace in a linkage 9423/// specification that uses braces. 9424Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9425 Decl *LinkageSpec, 9426 SourceLocation RBraceLoc) { 9427 if (LinkageSpec) { 9428 if (RBraceLoc.isValid()) { 9429 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9430 LSDecl->setRBraceLoc(RBraceLoc); 9431 } 9432 PopDeclContext(); 9433 } 9434 return LinkageSpec; 9435} 9436 9437/// \brief Perform semantic analysis for the variable declaration that 9438/// occurs within a C++ catch clause, returning the newly-created 9439/// variable. 9440VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9441 TypeSourceInfo *TInfo, 9442 SourceLocation StartLoc, 9443 SourceLocation Loc, 9444 IdentifierInfo *Name) { 9445 bool Invalid = false; 9446 QualType ExDeclType = TInfo->getType(); 9447 9448 // Arrays and functions decay. 9449 if (ExDeclType->isArrayType()) 9450 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9451 else if (ExDeclType->isFunctionType()) 9452 ExDeclType = Context.getPointerType(ExDeclType); 9453 9454 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9455 // The exception-declaration shall not denote a pointer or reference to an 9456 // incomplete type, other than [cv] void*. 9457 // N2844 forbids rvalue references. 9458 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9459 Diag(Loc, diag::err_catch_rvalue_ref); 9460 Invalid = true; 9461 } 9462 9463 // GCC allows catching pointers and references to incomplete types 9464 // as an extension; so do we, but we warn by default. 9465 9466 QualType BaseType = ExDeclType; 9467 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9468 unsigned DK = diag::err_catch_incomplete; 9469 bool IncompleteCatchIsInvalid = true; 9470 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9471 BaseType = Ptr->getPointeeType(); 9472 Mode = 1; 9473 DK = diag::ext_catch_incomplete_ptr; 9474 IncompleteCatchIsInvalid = false; 9475 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9476 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9477 BaseType = Ref->getPointeeType(); 9478 Mode = 2; 9479 DK = diag::ext_catch_incomplete_ref; 9480 IncompleteCatchIsInvalid = false; 9481 } 9482 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9483 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9484 IncompleteCatchIsInvalid) 9485 Invalid = true; 9486 9487 if (!Invalid && !ExDeclType->isDependentType() && 9488 RequireNonAbstractType(Loc, ExDeclType, 9489 diag::err_abstract_type_in_decl, 9490 AbstractVariableType)) 9491 Invalid = true; 9492 9493 // Only the non-fragile NeXT runtime currently supports C++ catches 9494 // of ObjC types, and no runtime supports catching ObjC types by value. 9495 if (!Invalid && getLangOptions().ObjC1) { 9496 QualType T = ExDeclType; 9497 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9498 T = RT->getPointeeType(); 9499 9500 if (T->isObjCObjectType()) { 9501 Diag(Loc, diag::err_objc_object_catch); 9502 Invalid = true; 9503 } else if (T->isObjCObjectPointerType()) { 9504 if (!getLangOptions().ObjCNonFragileABI) 9505 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9506 } 9507 } 9508 9509 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9510 ExDeclType, TInfo, SC_None, SC_None); 9511 ExDecl->setExceptionVariable(true); 9512 9513 if (!Invalid && !ExDeclType->isDependentType()) { 9514 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9515 // C++ [except.handle]p16: 9516 // The object declared in an exception-declaration or, if the 9517 // exception-declaration does not specify a name, a temporary (12.2) is 9518 // copy-initialized (8.5) from the exception object. [...] 9519 // The object is destroyed when the handler exits, after the destruction 9520 // of any automatic objects initialized within the handler. 9521 // 9522 // We just pretend to initialize the object with itself, then make sure 9523 // it can be destroyed later. 9524 QualType initType = ExDeclType; 9525 9526 InitializedEntity entity = 9527 InitializedEntity::InitializeVariable(ExDecl); 9528 InitializationKind initKind = 9529 InitializationKind::CreateCopy(Loc, SourceLocation()); 9530 9531 Expr *opaqueValue = 9532 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9533 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9534 ExprResult result = sequence.Perform(*this, entity, initKind, 9535 MultiExprArg(&opaqueValue, 1)); 9536 if (result.isInvalid()) 9537 Invalid = true; 9538 else { 9539 // If the constructor used was non-trivial, set this as the 9540 // "initializer". 9541 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9542 if (!construct->getConstructor()->isTrivial()) { 9543 Expr *init = MaybeCreateExprWithCleanups(construct); 9544 ExDecl->setInit(init); 9545 } 9546 9547 // And make sure it's destructable. 9548 FinalizeVarWithDestructor(ExDecl, recordType); 9549 } 9550 } 9551 } 9552 9553 if (Invalid) 9554 ExDecl->setInvalidDecl(); 9555 9556 return ExDecl; 9557} 9558 9559/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9560/// handler. 9561Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9562 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9563 bool Invalid = D.isInvalidType(); 9564 9565 // Check for unexpanded parameter packs. 9566 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9567 UPPC_ExceptionType)) { 9568 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9569 D.getIdentifierLoc()); 9570 Invalid = true; 9571 } 9572 9573 IdentifierInfo *II = D.getIdentifier(); 9574 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9575 LookupOrdinaryName, 9576 ForRedeclaration)) { 9577 // The scope should be freshly made just for us. There is just no way 9578 // it contains any previous declaration. 9579 assert(!S->isDeclScope(PrevDecl)); 9580 if (PrevDecl->isTemplateParameter()) { 9581 // Maybe we will complain about the shadowed template parameter. 9582 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9583 PrevDecl = 0; 9584 } 9585 } 9586 9587 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9588 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9589 << D.getCXXScopeSpec().getRange(); 9590 Invalid = true; 9591 } 9592 9593 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9594 D.getSourceRange().getBegin(), 9595 D.getIdentifierLoc(), 9596 D.getIdentifier()); 9597 if (Invalid) 9598 ExDecl->setInvalidDecl(); 9599 9600 // Add the exception declaration into this scope. 9601 if (II) 9602 PushOnScopeChains(ExDecl, S); 9603 else 9604 CurContext->addDecl(ExDecl); 9605 9606 ProcessDeclAttributes(S, ExDecl, D); 9607 return ExDecl; 9608} 9609 9610Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9611 Expr *AssertExpr, 9612 Expr *AssertMessageExpr_, 9613 SourceLocation RParenLoc) { 9614 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9615 9616 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9617 llvm::APSInt Value(32); 9618 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9619 Diag(StaticAssertLoc, 9620 diag::err_static_assert_expression_is_not_constant) << 9621 AssertExpr->getSourceRange(); 9622 return 0; 9623 } 9624 9625 if (Value == 0) { 9626 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9627 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9628 } 9629 } 9630 9631 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9632 return 0; 9633 9634 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9635 AssertExpr, AssertMessage, RParenLoc); 9636 9637 CurContext->addDecl(Decl); 9638 return Decl; 9639} 9640 9641/// \brief Perform semantic analysis of the given friend type declaration. 9642/// 9643/// \returns A friend declaration that. 9644FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9645 SourceLocation FriendLoc, 9646 TypeSourceInfo *TSInfo) { 9647 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9648 9649 QualType T = TSInfo->getType(); 9650 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9651 9652 // C++03 [class.friend]p2: 9653 // An elaborated-type-specifier shall be used in a friend declaration 9654 // for a class.* 9655 // 9656 // * The class-key of the elaborated-type-specifier is required. 9657 if (!ActiveTemplateInstantiations.empty()) { 9658 // Do not complain about the form of friend template types during 9659 // template instantiation; we will already have complained when the 9660 // template was declared. 9661 } else if (!T->isElaboratedTypeSpecifier()) { 9662 // If we evaluated the type to a record type, suggest putting 9663 // a tag in front. 9664 if (const RecordType *RT = T->getAs<RecordType>()) { 9665 RecordDecl *RD = RT->getDecl(); 9666 9667 std::string InsertionText = std::string(" ") + RD->getKindName(); 9668 9669 Diag(TypeRange.getBegin(), 9670 getLangOptions().CPlusPlus0x ? 9671 diag::warn_cxx98_compat_unelaborated_friend_type : 9672 diag::ext_unelaborated_friend_type) 9673 << (unsigned) RD->getTagKind() 9674 << T 9675 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9676 InsertionText); 9677 } else { 9678 Diag(FriendLoc, 9679 getLangOptions().CPlusPlus0x ? 9680 diag::warn_cxx98_compat_nonclass_type_friend : 9681 diag::ext_nonclass_type_friend) 9682 << T 9683 << SourceRange(FriendLoc, TypeRange.getEnd()); 9684 } 9685 } else if (T->getAs<EnumType>()) { 9686 Diag(FriendLoc, 9687 getLangOptions().CPlusPlus0x ? 9688 diag::warn_cxx98_compat_enum_friend : 9689 diag::ext_enum_friend) 9690 << T 9691 << SourceRange(FriendLoc, TypeRange.getEnd()); 9692 } 9693 9694 // C++0x [class.friend]p3: 9695 // If the type specifier in a friend declaration designates a (possibly 9696 // cv-qualified) class type, that class is declared as a friend; otherwise, 9697 // the friend declaration is ignored. 9698 9699 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9700 // in [class.friend]p3 that we do not implement. 9701 9702 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9703} 9704 9705/// Handle a friend tag declaration where the scope specifier was 9706/// templated. 9707Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9708 unsigned TagSpec, SourceLocation TagLoc, 9709 CXXScopeSpec &SS, 9710 IdentifierInfo *Name, SourceLocation NameLoc, 9711 AttributeList *Attr, 9712 MultiTemplateParamsArg TempParamLists) { 9713 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9714 9715 bool isExplicitSpecialization = false; 9716 bool Invalid = false; 9717 9718 if (TemplateParameterList *TemplateParams 9719 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9720 TempParamLists.get(), 9721 TempParamLists.size(), 9722 /*friend*/ true, 9723 isExplicitSpecialization, 9724 Invalid)) { 9725 if (TemplateParams->size() > 0) { 9726 // This is a declaration of a class template. 9727 if (Invalid) 9728 return 0; 9729 9730 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9731 SS, Name, NameLoc, Attr, 9732 TemplateParams, AS_public, 9733 /*ModulePrivateLoc=*/SourceLocation(), 9734 TempParamLists.size() - 1, 9735 (TemplateParameterList**) TempParamLists.release()).take(); 9736 } else { 9737 // The "template<>" header is extraneous. 9738 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9739 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9740 isExplicitSpecialization = true; 9741 } 9742 } 9743 9744 if (Invalid) return 0; 9745 9746 bool isAllExplicitSpecializations = true; 9747 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9748 if (TempParamLists.get()[I]->size()) { 9749 isAllExplicitSpecializations = false; 9750 break; 9751 } 9752 } 9753 9754 // FIXME: don't ignore attributes. 9755 9756 // If it's explicit specializations all the way down, just forget 9757 // about the template header and build an appropriate non-templated 9758 // friend. TODO: for source fidelity, remember the headers. 9759 if (isAllExplicitSpecializations) { 9760 if (SS.isEmpty()) { 9761 bool Owned = false; 9762 bool IsDependent = false; 9763 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9764 Attr, AS_public, 9765 /*ModulePrivateLoc=*/SourceLocation(), 9766 MultiTemplateParamsArg(), Owned, IsDependent, 9767 /*ScopedEnum=*/false, 9768 /*ScopedEnumUsesClassTag=*/false, 9769 /*UnderlyingType=*/TypeResult()); 9770 } 9771 9772 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9773 ElaboratedTypeKeyword Keyword 9774 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9775 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9776 *Name, NameLoc); 9777 if (T.isNull()) 9778 return 0; 9779 9780 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9781 if (isa<DependentNameType>(T)) { 9782 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9783 TL.setKeywordLoc(TagLoc); 9784 TL.setQualifierLoc(QualifierLoc); 9785 TL.setNameLoc(NameLoc); 9786 } else { 9787 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9788 TL.setKeywordLoc(TagLoc); 9789 TL.setQualifierLoc(QualifierLoc); 9790 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9791 } 9792 9793 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9794 TSI, FriendLoc); 9795 Friend->setAccess(AS_public); 9796 CurContext->addDecl(Friend); 9797 return Friend; 9798 } 9799 9800 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9801 9802 9803 9804 // Handle the case of a templated-scope friend class. e.g. 9805 // template <class T> class A<T>::B; 9806 // FIXME: we don't support these right now. 9807 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9808 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9809 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9810 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9811 TL.setKeywordLoc(TagLoc); 9812 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9813 TL.setNameLoc(NameLoc); 9814 9815 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9816 TSI, FriendLoc); 9817 Friend->setAccess(AS_public); 9818 Friend->setUnsupportedFriend(true); 9819 CurContext->addDecl(Friend); 9820 return Friend; 9821} 9822 9823 9824/// Handle a friend type declaration. This works in tandem with 9825/// ActOnTag. 9826/// 9827/// Notes on friend class templates: 9828/// 9829/// We generally treat friend class declarations as if they were 9830/// declaring a class. So, for example, the elaborated type specifier 9831/// in a friend declaration is required to obey the restrictions of a 9832/// class-head (i.e. no typedefs in the scope chain), template 9833/// parameters are required to match up with simple template-ids, &c. 9834/// However, unlike when declaring a template specialization, it's 9835/// okay to refer to a template specialization without an empty 9836/// template parameter declaration, e.g. 9837/// friend class A<T>::B<unsigned>; 9838/// We permit this as a special case; if there are any template 9839/// parameters present at all, require proper matching, i.e. 9840/// template <> template <class T> friend class A<int>::B; 9841Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9842 MultiTemplateParamsArg TempParams) { 9843 SourceLocation Loc = DS.getSourceRange().getBegin(); 9844 9845 assert(DS.isFriendSpecified()); 9846 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9847 9848 // Try to convert the decl specifier to a type. This works for 9849 // friend templates because ActOnTag never produces a ClassTemplateDecl 9850 // for a TUK_Friend. 9851 Declarator TheDeclarator(DS, Declarator::MemberContext); 9852 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9853 QualType T = TSI->getType(); 9854 if (TheDeclarator.isInvalidType()) 9855 return 0; 9856 9857 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9858 return 0; 9859 9860 // This is definitely an error in C++98. It's probably meant to 9861 // be forbidden in C++0x, too, but the specification is just 9862 // poorly written. 9863 // 9864 // The problem is with declarations like the following: 9865 // template <T> friend A<T>::foo; 9866 // where deciding whether a class C is a friend or not now hinges 9867 // on whether there exists an instantiation of A that causes 9868 // 'foo' to equal C. There are restrictions on class-heads 9869 // (which we declare (by fiat) elaborated friend declarations to 9870 // be) that makes this tractable. 9871 // 9872 // FIXME: handle "template <> friend class A<T>;", which 9873 // is possibly well-formed? Who even knows? 9874 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9875 Diag(Loc, diag::err_tagless_friend_type_template) 9876 << DS.getSourceRange(); 9877 return 0; 9878 } 9879 9880 // C++98 [class.friend]p1: A friend of a class is a function 9881 // or class that is not a member of the class . . . 9882 // This is fixed in DR77, which just barely didn't make the C++03 9883 // deadline. It's also a very silly restriction that seriously 9884 // affects inner classes and which nobody else seems to implement; 9885 // thus we never diagnose it, not even in -pedantic. 9886 // 9887 // But note that we could warn about it: it's always useless to 9888 // friend one of your own members (it's not, however, worthless to 9889 // friend a member of an arbitrary specialization of your template). 9890 9891 Decl *D; 9892 if (unsigned NumTempParamLists = TempParams.size()) 9893 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9894 NumTempParamLists, 9895 TempParams.release(), 9896 TSI, 9897 DS.getFriendSpecLoc()); 9898 else 9899 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9900 9901 if (!D) 9902 return 0; 9903 9904 D->setAccess(AS_public); 9905 CurContext->addDecl(D); 9906 9907 return D; 9908} 9909 9910Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9911 MultiTemplateParamsArg TemplateParams) { 9912 const DeclSpec &DS = D.getDeclSpec(); 9913 9914 assert(DS.isFriendSpecified()); 9915 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9916 9917 SourceLocation Loc = D.getIdentifierLoc(); 9918 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9919 9920 // C++ [class.friend]p1 9921 // A friend of a class is a function or class.... 9922 // Note that this sees through typedefs, which is intended. 9923 // It *doesn't* see through dependent types, which is correct 9924 // according to [temp.arg.type]p3: 9925 // If a declaration acquires a function type through a 9926 // type dependent on a template-parameter and this causes 9927 // a declaration that does not use the syntactic form of a 9928 // function declarator to have a function type, the program 9929 // is ill-formed. 9930 if (!TInfo->getType()->isFunctionType()) { 9931 Diag(Loc, diag::err_unexpected_friend); 9932 9933 // It might be worthwhile to try to recover by creating an 9934 // appropriate declaration. 9935 return 0; 9936 } 9937 9938 // C++ [namespace.memdef]p3 9939 // - If a friend declaration in a non-local class first declares a 9940 // class or function, the friend class or function is a member 9941 // of the innermost enclosing namespace. 9942 // - The name of the friend is not found by simple name lookup 9943 // until a matching declaration is provided in that namespace 9944 // scope (either before or after the class declaration granting 9945 // friendship). 9946 // - If a friend function is called, its name may be found by the 9947 // name lookup that considers functions from namespaces and 9948 // classes associated with the types of the function arguments. 9949 // - When looking for a prior declaration of a class or a function 9950 // declared as a friend, scopes outside the innermost enclosing 9951 // namespace scope are not considered. 9952 9953 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9954 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9955 DeclarationName Name = NameInfo.getName(); 9956 assert(Name); 9957 9958 // Check for unexpanded parameter packs. 9959 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9960 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9961 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9962 return 0; 9963 9964 // The context we found the declaration in, or in which we should 9965 // create the declaration. 9966 DeclContext *DC; 9967 Scope *DCScope = S; 9968 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9969 ForRedeclaration); 9970 9971 // FIXME: there are different rules in local classes 9972 9973 // There are four cases here. 9974 // - There's no scope specifier, in which case we just go to the 9975 // appropriate scope and look for a function or function template 9976 // there as appropriate. 9977 // Recover from invalid scope qualifiers as if they just weren't there. 9978 if (SS.isInvalid() || !SS.isSet()) { 9979 // C++0x [namespace.memdef]p3: 9980 // If the name in a friend declaration is neither qualified nor 9981 // a template-id and the declaration is a function or an 9982 // elaborated-type-specifier, the lookup to determine whether 9983 // the entity has been previously declared shall not consider 9984 // any scopes outside the innermost enclosing namespace. 9985 // C++0x [class.friend]p11: 9986 // If a friend declaration appears in a local class and the name 9987 // specified is an unqualified name, a prior declaration is 9988 // looked up without considering scopes that are outside the 9989 // innermost enclosing non-class scope. For a friend function 9990 // declaration, if there is no prior declaration, the program is 9991 // ill-formed. 9992 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9993 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9994 9995 // Find the appropriate context according to the above. 9996 DC = CurContext; 9997 while (true) { 9998 // Skip class contexts. If someone can cite chapter and verse 9999 // for this behavior, that would be nice --- it's what GCC and 10000 // EDG do, and it seems like a reasonable intent, but the spec 10001 // really only says that checks for unqualified existing 10002 // declarations should stop at the nearest enclosing namespace, 10003 // not that they should only consider the nearest enclosing 10004 // namespace. 10005 while (DC->isRecord()) 10006 DC = DC->getParent(); 10007 10008 LookupQualifiedName(Previous, DC); 10009 10010 // TODO: decide what we think about using declarations. 10011 if (isLocal || !Previous.empty()) 10012 break; 10013 10014 if (isTemplateId) { 10015 if (isa<TranslationUnitDecl>(DC)) break; 10016 } else { 10017 if (DC->isFileContext()) break; 10018 } 10019 DC = DC->getParent(); 10020 } 10021 10022 // C++ [class.friend]p1: A friend of a class is a function or 10023 // class that is not a member of the class . . . 10024 // C++11 changes this for both friend types and functions. 10025 // Most C++ 98 compilers do seem to give an error here, so 10026 // we do, too. 10027 if (!Previous.empty() && DC->Equals(CurContext)) 10028 Diag(DS.getFriendSpecLoc(), 10029 getLangOptions().CPlusPlus0x ? 10030 diag::warn_cxx98_compat_friend_is_member : 10031 diag::err_friend_is_member); 10032 10033 DCScope = getScopeForDeclContext(S, DC); 10034 10035 // C++ [class.friend]p6: 10036 // A function can be defined in a friend declaration of a class if and 10037 // only if the class is a non-local class (9.8), the function name is 10038 // unqualified, and the function has namespace scope. 10039 if (isLocal && D.isFunctionDefinition()) { 10040 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10041 } 10042 10043 // - There's a non-dependent scope specifier, in which case we 10044 // compute it and do a previous lookup there for a function 10045 // or function template. 10046 } else if (!SS.getScopeRep()->isDependent()) { 10047 DC = computeDeclContext(SS); 10048 if (!DC) return 0; 10049 10050 if (RequireCompleteDeclContext(SS, DC)) return 0; 10051 10052 LookupQualifiedName(Previous, DC); 10053 10054 // Ignore things found implicitly in the wrong scope. 10055 // TODO: better diagnostics for this case. Suggesting the right 10056 // qualified scope would be nice... 10057 LookupResult::Filter F = Previous.makeFilter(); 10058 while (F.hasNext()) { 10059 NamedDecl *D = F.next(); 10060 if (!DC->InEnclosingNamespaceSetOf( 10061 D->getDeclContext()->getRedeclContext())) 10062 F.erase(); 10063 } 10064 F.done(); 10065 10066 if (Previous.empty()) { 10067 D.setInvalidType(); 10068 Diag(Loc, diag::err_qualified_friend_not_found) 10069 << Name << TInfo->getType(); 10070 return 0; 10071 } 10072 10073 // C++ [class.friend]p1: A friend of a class is a function or 10074 // class that is not a member of the class . . . 10075 if (DC->Equals(CurContext)) 10076 Diag(DS.getFriendSpecLoc(), 10077 getLangOptions().CPlusPlus0x ? 10078 diag::warn_cxx98_compat_friend_is_member : 10079 diag::err_friend_is_member); 10080 10081 if (D.isFunctionDefinition()) { 10082 // C++ [class.friend]p6: 10083 // A function can be defined in a friend declaration of a class if and 10084 // only if the class is a non-local class (9.8), the function name is 10085 // unqualified, and the function has namespace scope. 10086 SemaDiagnosticBuilder DB 10087 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10088 10089 DB << SS.getScopeRep(); 10090 if (DC->isFileContext()) 10091 DB << FixItHint::CreateRemoval(SS.getRange()); 10092 SS.clear(); 10093 } 10094 10095 // - There's a scope specifier that does not match any template 10096 // parameter lists, in which case we use some arbitrary context, 10097 // create a method or method template, and wait for instantiation. 10098 // - There's a scope specifier that does match some template 10099 // parameter lists, which we don't handle right now. 10100 } else { 10101 if (D.isFunctionDefinition()) { 10102 // C++ [class.friend]p6: 10103 // A function can be defined in a friend declaration of a class if and 10104 // only if the class is a non-local class (9.8), the function name is 10105 // unqualified, and the function has namespace scope. 10106 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10107 << SS.getScopeRep(); 10108 } 10109 10110 DC = CurContext; 10111 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10112 } 10113 10114 if (!DC->isRecord()) { 10115 // This implies that it has to be an operator or function. 10116 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10117 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10118 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10119 Diag(Loc, diag::err_introducing_special_friend) << 10120 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10121 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10122 return 0; 10123 } 10124 } 10125 10126 bool AddToScope = true; 10127 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10128 move(TemplateParams), AddToScope); 10129 if (!ND) return 0; 10130 10131 assert(ND->getDeclContext() == DC); 10132 assert(ND->getLexicalDeclContext() == CurContext); 10133 10134 // Add the function declaration to the appropriate lookup tables, 10135 // adjusting the redeclarations list as necessary. We don't 10136 // want to do this yet if the friending class is dependent. 10137 // 10138 // Also update the scope-based lookup if the target context's 10139 // lookup context is in lexical scope. 10140 if (!CurContext->isDependentContext()) { 10141 DC = DC->getRedeclContext(); 10142 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10143 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10144 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10145 } 10146 10147 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10148 D.getIdentifierLoc(), ND, 10149 DS.getFriendSpecLoc()); 10150 FrD->setAccess(AS_public); 10151 CurContext->addDecl(FrD); 10152 10153 if (ND->isInvalidDecl()) 10154 FrD->setInvalidDecl(); 10155 else { 10156 FunctionDecl *FD; 10157 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10158 FD = FTD->getTemplatedDecl(); 10159 else 10160 FD = cast<FunctionDecl>(ND); 10161 10162 // Mark templated-scope function declarations as unsupported. 10163 if (FD->getNumTemplateParameterLists()) 10164 FrD->setUnsupportedFriend(true); 10165 } 10166 10167 return ND; 10168} 10169 10170void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10171 AdjustDeclIfTemplate(Dcl); 10172 10173 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10174 if (!Fn) { 10175 Diag(DelLoc, diag::err_deleted_non_function); 10176 return; 10177 } 10178 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10179 Diag(DelLoc, diag::err_deleted_decl_not_first); 10180 Diag(Prev->getLocation(), diag::note_previous_declaration); 10181 // If the declaration wasn't the first, we delete the function anyway for 10182 // recovery. 10183 } 10184 Fn->setDeletedAsWritten(); 10185} 10186 10187void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10188 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10189 10190 if (MD) { 10191 if (MD->getParent()->isDependentType()) { 10192 MD->setDefaulted(); 10193 MD->setExplicitlyDefaulted(); 10194 return; 10195 } 10196 10197 CXXSpecialMember Member = getSpecialMember(MD); 10198 if (Member == CXXInvalid) { 10199 Diag(DefaultLoc, diag::err_default_special_members); 10200 return; 10201 } 10202 10203 MD->setDefaulted(); 10204 MD->setExplicitlyDefaulted(); 10205 10206 // If this definition appears within the record, do the checking when 10207 // the record is complete. 10208 const FunctionDecl *Primary = MD; 10209 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10210 // Find the uninstantiated declaration that actually had the '= default' 10211 // on it. 10212 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10213 10214 if (Primary == Primary->getCanonicalDecl()) 10215 return; 10216 10217 switch (Member) { 10218 case CXXDefaultConstructor: { 10219 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10220 CheckExplicitlyDefaultedDefaultConstructor(CD); 10221 if (!CD->isInvalidDecl()) 10222 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10223 break; 10224 } 10225 10226 case CXXCopyConstructor: { 10227 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10228 CheckExplicitlyDefaultedCopyConstructor(CD); 10229 if (!CD->isInvalidDecl()) 10230 DefineImplicitCopyConstructor(DefaultLoc, CD); 10231 break; 10232 } 10233 10234 case CXXCopyAssignment: { 10235 CheckExplicitlyDefaultedCopyAssignment(MD); 10236 if (!MD->isInvalidDecl()) 10237 DefineImplicitCopyAssignment(DefaultLoc, MD); 10238 break; 10239 } 10240 10241 case CXXDestructor: { 10242 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10243 CheckExplicitlyDefaultedDestructor(DD); 10244 if (!DD->isInvalidDecl()) 10245 DefineImplicitDestructor(DefaultLoc, DD); 10246 break; 10247 } 10248 10249 case CXXMoveConstructor: { 10250 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10251 CheckExplicitlyDefaultedMoveConstructor(CD); 10252 if (!CD->isInvalidDecl()) 10253 DefineImplicitMoveConstructor(DefaultLoc, CD); 10254 break; 10255 } 10256 10257 case CXXMoveAssignment: { 10258 CheckExplicitlyDefaultedMoveAssignment(MD); 10259 if (!MD->isInvalidDecl()) 10260 DefineImplicitMoveAssignment(DefaultLoc, MD); 10261 break; 10262 } 10263 10264 case CXXInvalid: 10265 llvm_unreachable("Invalid special member."); 10266 } 10267 } else { 10268 Diag(DefaultLoc, diag::err_default_special_members); 10269 } 10270} 10271 10272static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10273 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10274 Stmt *SubStmt = *CI; 10275 if (!SubStmt) 10276 continue; 10277 if (isa<ReturnStmt>(SubStmt)) 10278 Self.Diag(SubStmt->getSourceRange().getBegin(), 10279 diag::err_return_in_constructor_handler); 10280 if (!isa<Expr>(SubStmt)) 10281 SearchForReturnInStmt(Self, SubStmt); 10282 } 10283} 10284 10285void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10286 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10287 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10288 SearchForReturnInStmt(*this, Handler); 10289 } 10290} 10291 10292bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10293 const CXXMethodDecl *Old) { 10294 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10295 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10296 10297 if (Context.hasSameType(NewTy, OldTy) || 10298 NewTy->isDependentType() || OldTy->isDependentType()) 10299 return false; 10300 10301 // Check if the return types are covariant 10302 QualType NewClassTy, OldClassTy; 10303 10304 /// Both types must be pointers or references to classes. 10305 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10306 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10307 NewClassTy = NewPT->getPointeeType(); 10308 OldClassTy = OldPT->getPointeeType(); 10309 } 10310 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10311 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10312 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10313 NewClassTy = NewRT->getPointeeType(); 10314 OldClassTy = OldRT->getPointeeType(); 10315 } 10316 } 10317 } 10318 10319 // The return types aren't either both pointers or references to a class type. 10320 if (NewClassTy.isNull()) { 10321 Diag(New->getLocation(), 10322 diag::err_different_return_type_for_overriding_virtual_function) 10323 << New->getDeclName() << NewTy << OldTy; 10324 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10325 10326 return true; 10327 } 10328 10329 // C++ [class.virtual]p6: 10330 // If the return type of D::f differs from the return type of B::f, the 10331 // class type in the return type of D::f shall be complete at the point of 10332 // declaration of D::f or shall be the class type D. 10333 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10334 if (!RT->isBeingDefined() && 10335 RequireCompleteType(New->getLocation(), NewClassTy, 10336 PDiag(diag::err_covariant_return_incomplete) 10337 << New->getDeclName())) 10338 return true; 10339 } 10340 10341 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10342 // Check if the new class derives from the old class. 10343 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10344 Diag(New->getLocation(), 10345 diag::err_covariant_return_not_derived) 10346 << New->getDeclName() << NewTy << OldTy; 10347 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10348 return true; 10349 } 10350 10351 // Check if we the conversion from derived to base is valid. 10352 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10353 diag::err_covariant_return_inaccessible_base, 10354 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10355 // FIXME: Should this point to the return type? 10356 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10357 // FIXME: this note won't trigger for delayed access control 10358 // diagnostics, and it's impossible to get an undelayed error 10359 // here from access control during the original parse because 10360 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10361 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10362 return true; 10363 } 10364 } 10365 10366 // The qualifiers of the return types must be the same. 10367 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10368 Diag(New->getLocation(), 10369 diag::err_covariant_return_type_different_qualifications) 10370 << New->getDeclName() << NewTy << OldTy; 10371 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10372 return true; 10373 }; 10374 10375 10376 // The new class type must have the same or less qualifiers as the old type. 10377 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10378 Diag(New->getLocation(), 10379 diag::err_covariant_return_type_class_type_more_qualified) 10380 << New->getDeclName() << NewTy << OldTy; 10381 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10382 return true; 10383 }; 10384 10385 return false; 10386} 10387 10388/// \brief Mark the given method pure. 10389/// 10390/// \param Method the method to be marked pure. 10391/// 10392/// \param InitRange the source range that covers the "0" initializer. 10393bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10394 SourceLocation EndLoc = InitRange.getEnd(); 10395 if (EndLoc.isValid()) 10396 Method->setRangeEnd(EndLoc); 10397 10398 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10399 Method->setPure(); 10400 return false; 10401 } 10402 10403 if (!Method->isInvalidDecl()) 10404 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10405 << Method->getDeclName() << InitRange; 10406 return true; 10407} 10408 10409/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10410/// an initializer for the out-of-line declaration 'Dcl'. The scope 10411/// is a fresh scope pushed for just this purpose. 10412/// 10413/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10414/// static data member of class X, names should be looked up in the scope of 10415/// class X. 10416void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10417 // If there is no declaration, there was an error parsing it. 10418 if (D == 0 || D->isInvalidDecl()) return; 10419 10420 // We should only get called for declarations with scope specifiers, like: 10421 // int foo::bar; 10422 assert(D->isOutOfLine()); 10423 EnterDeclaratorContext(S, D->getDeclContext()); 10424} 10425 10426/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10427/// initializer for the out-of-line declaration 'D'. 10428void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10429 // If there is no declaration, there was an error parsing it. 10430 if (D == 0 || D->isInvalidDecl()) return; 10431 10432 assert(D->isOutOfLine()); 10433 ExitDeclaratorContext(S); 10434} 10435 10436/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10437/// C++ if/switch/while/for statement. 10438/// e.g: "if (int x = f()) {...}" 10439DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10440 // C++ 6.4p2: 10441 // The declarator shall not specify a function or an array. 10442 // The type-specifier-seq shall not contain typedef and shall not declare a 10443 // new class or enumeration. 10444 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10445 "Parser allowed 'typedef' as storage class of condition decl."); 10446 10447 Decl *Dcl = ActOnDeclarator(S, D); 10448 if (!Dcl) 10449 return true; 10450 10451 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10452 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10453 << D.getSourceRange(); 10454 return true; 10455 } 10456 10457 return Dcl; 10458} 10459 10460void Sema::LoadExternalVTableUses() { 10461 if (!ExternalSource) 10462 return; 10463 10464 SmallVector<ExternalVTableUse, 4> VTables; 10465 ExternalSource->ReadUsedVTables(VTables); 10466 SmallVector<VTableUse, 4> NewUses; 10467 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10468 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10469 = VTablesUsed.find(VTables[I].Record); 10470 // Even if a definition wasn't required before, it may be required now. 10471 if (Pos != VTablesUsed.end()) { 10472 if (!Pos->second && VTables[I].DefinitionRequired) 10473 Pos->second = true; 10474 continue; 10475 } 10476 10477 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10478 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10479 } 10480 10481 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10482} 10483 10484void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10485 bool DefinitionRequired) { 10486 // Ignore any vtable uses in unevaluated operands or for classes that do 10487 // not have a vtable. 10488 if (!Class->isDynamicClass() || Class->isDependentContext() || 10489 CurContext->isDependentContext() || 10490 ExprEvalContexts.back().Context == Unevaluated) 10491 return; 10492 10493 // Try to insert this class into the map. 10494 LoadExternalVTableUses(); 10495 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10496 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10497 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10498 if (!Pos.second) { 10499 // If we already had an entry, check to see if we are promoting this vtable 10500 // to required a definition. If so, we need to reappend to the VTableUses 10501 // list, since we may have already processed the first entry. 10502 if (DefinitionRequired && !Pos.first->second) { 10503 Pos.first->second = true; 10504 } else { 10505 // Otherwise, we can early exit. 10506 return; 10507 } 10508 } 10509 10510 // Local classes need to have their virtual members marked 10511 // immediately. For all other classes, we mark their virtual members 10512 // at the end of the translation unit. 10513 if (Class->isLocalClass()) 10514 MarkVirtualMembersReferenced(Loc, Class); 10515 else 10516 VTableUses.push_back(std::make_pair(Class, Loc)); 10517} 10518 10519bool Sema::DefineUsedVTables() { 10520 LoadExternalVTableUses(); 10521 if (VTableUses.empty()) 10522 return false; 10523 10524 // Note: The VTableUses vector could grow as a result of marking 10525 // the members of a class as "used", so we check the size each 10526 // time through the loop and prefer indices (with are stable) to 10527 // iterators (which are not). 10528 bool DefinedAnything = false; 10529 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10530 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10531 if (!Class) 10532 continue; 10533 10534 SourceLocation Loc = VTableUses[I].second; 10535 10536 // If this class has a key function, but that key function is 10537 // defined in another translation unit, we don't need to emit the 10538 // vtable even though we're using it. 10539 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10540 if (KeyFunction && !KeyFunction->hasBody()) { 10541 switch (KeyFunction->getTemplateSpecializationKind()) { 10542 case TSK_Undeclared: 10543 case TSK_ExplicitSpecialization: 10544 case TSK_ExplicitInstantiationDeclaration: 10545 // The key function is in another translation unit. 10546 continue; 10547 10548 case TSK_ExplicitInstantiationDefinition: 10549 case TSK_ImplicitInstantiation: 10550 // We will be instantiating the key function. 10551 break; 10552 } 10553 } else if (!KeyFunction) { 10554 // If we have a class with no key function that is the subject 10555 // of an explicit instantiation declaration, suppress the 10556 // vtable; it will live with the explicit instantiation 10557 // definition. 10558 bool IsExplicitInstantiationDeclaration 10559 = Class->getTemplateSpecializationKind() 10560 == TSK_ExplicitInstantiationDeclaration; 10561 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10562 REnd = Class->redecls_end(); 10563 R != REnd; ++R) { 10564 TemplateSpecializationKind TSK 10565 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10566 if (TSK == TSK_ExplicitInstantiationDeclaration) 10567 IsExplicitInstantiationDeclaration = true; 10568 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10569 IsExplicitInstantiationDeclaration = false; 10570 break; 10571 } 10572 } 10573 10574 if (IsExplicitInstantiationDeclaration) 10575 continue; 10576 } 10577 10578 // Mark all of the virtual members of this class as referenced, so 10579 // that we can build a vtable. Then, tell the AST consumer that a 10580 // vtable for this class is required. 10581 DefinedAnything = true; 10582 MarkVirtualMembersReferenced(Loc, Class); 10583 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10584 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10585 10586 // Optionally warn if we're emitting a weak vtable. 10587 if (Class->getLinkage() == ExternalLinkage && 10588 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10589 const FunctionDecl *KeyFunctionDef = 0; 10590 if (!KeyFunction || 10591 (KeyFunction->hasBody(KeyFunctionDef) && 10592 KeyFunctionDef->isInlined())) 10593 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10594 } 10595 } 10596 VTableUses.clear(); 10597 10598 return DefinedAnything; 10599} 10600 10601void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10602 const CXXRecordDecl *RD) { 10603 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10604 e = RD->method_end(); i != e; ++i) { 10605 CXXMethodDecl *MD = *i; 10606 10607 // C++ [basic.def.odr]p2: 10608 // [...] A virtual member function is used if it is not pure. [...] 10609 if (MD->isVirtual() && !MD->isPure()) 10610 MarkDeclarationReferenced(Loc, MD); 10611 } 10612 10613 // Only classes that have virtual bases need a VTT. 10614 if (RD->getNumVBases() == 0) 10615 return; 10616 10617 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10618 e = RD->bases_end(); i != e; ++i) { 10619 const CXXRecordDecl *Base = 10620 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10621 if (Base->getNumVBases() == 0) 10622 continue; 10623 MarkVirtualMembersReferenced(Loc, Base); 10624 } 10625} 10626 10627/// SetIvarInitializers - This routine builds initialization ASTs for the 10628/// Objective-C implementation whose ivars need be initialized. 10629void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10630 if (!getLangOptions().CPlusPlus) 10631 return; 10632 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10633 SmallVector<ObjCIvarDecl*, 8> ivars; 10634 CollectIvarsToConstructOrDestruct(OID, ivars); 10635 if (ivars.empty()) 10636 return; 10637 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10638 for (unsigned i = 0; i < ivars.size(); i++) { 10639 FieldDecl *Field = ivars[i]; 10640 if (Field->isInvalidDecl()) 10641 continue; 10642 10643 CXXCtorInitializer *Member; 10644 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10645 InitializationKind InitKind = 10646 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10647 10648 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10649 ExprResult MemberInit = 10650 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10651 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10652 // Note, MemberInit could actually come back empty if no initialization 10653 // is required (e.g., because it would call a trivial default constructor) 10654 if (!MemberInit.get() || MemberInit.isInvalid()) 10655 continue; 10656 10657 Member = 10658 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10659 SourceLocation(), 10660 MemberInit.takeAs<Expr>(), 10661 SourceLocation()); 10662 AllToInit.push_back(Member); 10663 10664 // Be sure that the destructor is accessible and is marked as referenced. 10665 if (const RecordType *RecordTy 10666 = Context.getBaseElementType(Field->getType()) 10667 ->getAs<RecordType>()) { 10668 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10669 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10670 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10671 CheckDestructorAccess(Field->getLocation(), Destructor, 10672 PDiag(diag::err_access_dtor_ivar) 10673 << Context.getBaseElementType(Field->getType())); 10674 } 10675 } 10676 } 10677 ObjCImplementation->setIvarInitializers(Context, 10678 AllToInit.data(), AllToInit.size()); 10679 } 10680} 10681 10682static 10683void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10684 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10685 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10686 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10687 Sema &S) { 10688 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10689 CE = Current.end(); 10690 if (Ctor->isInvalidDecl()) 10691 return; 10692 10693 const FunctionDecl *FNTarget = 0; 10694 CXXConstructorDecl *Target; 10695 10696 // We ignore the result here since if we don't have a body, Target will be 10697 // null below. 10698 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10699 Target 10700= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10701 10702 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10703 // Avoid dereferencing a null pointer here. 10704 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10705 10706 if (!Current.insert(Canonical)) 10707 return; 10708 10709 // We know that beyond here, we aren't chaining into a cycle. 10710 if (!Target || !Target->isDelegatingConstructor() || 10711 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10712 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10713 Valid.insert(*CI); 10714 Current.clear(); 10715 // We've hit a cycle. 10716 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10717 Current.count(TCanonical)) { 10718 // If we haven't diagnosed this cycle yet, do so now. 10719 if (!Invalid.count(TCanonical)) { 10720 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10721 diag::warn_delegating_ctor_cycle) 10722 << Ctor; 10723 10724 // Don't add a note for a function delegating directo to itself. 10725 if (TCanonical != Canonical) 10726 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10727 10728 CXXConstructorDecl *C = Target; 10729 while (C->getCanonicalDecl() != Canonical) { 10730 (void)C->getTargetConstructor()->hasBody(FNTarget); 10731 assert(FNTarget && "Ctor cycle through bodiless function"); 10732 10733 C 10734 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10735 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10736 } 10737 } 10738 10739 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10740 Invalid.insert(*CI); 10741 Current.clear(); 10742 } else { 10743 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10744 } 10745} 10746 10747 10748void Sema::CheckDelegatingCtorCycles() { 10749 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10750 10751 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10752 CE = Current.end(); 10753 10754 for (DelegatingCtorDeclsType::iterator 10755 I = DelegatingCtorDecls.begin(ExternalSource), 10756 E = DelegatingCtorDecls.end(); 10757 I != E; ++I) { 10758 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10759 } 10760 10761 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10762 (*CI)->setInvalidDecl(); 10763} 10764 10765/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10766Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10767 // Implicitly declared functions (e.g. copy constructors) are 10768 // __host__ __device__ 10769 if (D->isImplicit()) 10770 return CFT_HostDevice; 10771 10772 if (D->hasAttr<CUDAGlobalAttr>()) 10773 return CFT_Global; 10774 10775 if (D->hasAttr<CUDADeviceAttr>()) { 10776 if (D->hasAttr<CUDAHostAttr>()) 10777 return CFT_HostDevice; 10778 else 10779 return CFT_Device; 10780 } 10781 10782 return CFT_Host; 10783} 10784 10785bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10786 CUDAFunctionTarget CalleeTarget) { 10787 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10788 // Callable from the device only." 10789 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10790 return true; 10791 10792 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10793 // Callable from the host only." 10794 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10795 // Callable from the host only." 10796 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10797 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10798 return true; 10799 10800 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10801 return true; 10802 10803 return false; 10804} 10805