SemaDeclCXX.cpp revision 13c7fcceb9fd96f5be03af038ce16b05bb5e9598
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 = dyn_cast<RecordType>(NewBaseType)) 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 ExprResult Init = InitExpr; 1639 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1640 // FIXME: if there is no EqualLoc, this is list-initialization. 1641 Init = PerformCopyInitialization( 1642 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1643 if (Init.isInvalid()) { 1644 FD->setInvalidDecl(); 1645 return; 1646 } 1647 1648 CheckImplicitConversions(Init.get(), EqualLoc); 1649 } 1650 1651 // C++0x [class.base.init]p7: 1652 // The initialization of each base and member constitutes a 1653 // full-expression. 1654 Init = MaybeCreateExprWithCleanups(Init); 1655 if (Init.isInvalid()) { 1656 FD->setInvalidDecl(); 1657 return; 1658 } 1659 1660 InitExpr = Init.release(); 1661 1662 FD->setInClassInitializer(InitExpr); 1663} 1664 1665/// \brief Find the direct and/or virtual base specifiers that 1666/// correspond to the given base type, for use in base initialization 1667/// within a constructor. 1668static bool FindBaseInitializer(Sema &SemaRef, 1669 CXXRecordDecl *ClassDecl, 1670 QualType BaseType, 1671 const CXXBaseSpecifier *&DirectBaseSpec, 1672 const CXXBaseSpecifier *&VirtualBaseSpec) { 1673 // First, check for a direct base class. 1674 DirectBaseSpec = 0; 1675 for (CXXRecordDecl::base_class_const_iterator Base 1676 = ClassDecl->bases_begin(); 1677 Base != ClassDecl->bases_end(); ++Base) { 1678 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1679 // We found a direct base of this type. That's what we're 1680 // initializing. 1681 DirectBaseSpec = &*Base; 1682 break; 1683 } 1684 } 1685 1686 // Check for a virtual base class. 1687 // FIXME: We might be able to short-circuit this if we know in advance that 1688 // there are no virtual bases. 1689 VirtualBaseSpec = 0; 1690 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1691 // We haven't found a base yet; search the class hierarchy for a 1692 // virtual base class. 1693 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1694 /*DetectVirtual=*/false); 1695 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1696 BaseType, Paths)) { 1697 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1698 Path != Paths.end(); ++Path) { 1699 if (Path->back().Base->isVirtual()) { 1700 VirtualBaseSpec = Path->back().Base; 1701 break; 1702 } 1703 } 1704 } 1705 } 1706 1707 return DirectBaseSpec || VirtualBaseSpec; 1708} 1709 1710/// \brief Handle a C++ member initializer using braced-init-list syntax. 1711MemInitResult 1712Sema::ActOnMemInitializer(Decl *ConstructorD, 1713 Scope *S, 1714 CXXScopeSpec &SS, 1715 IdentifierInfo *MemberOrBase, 1716 ParsedType TemplateTypeTy, 1717 SourceLocation IdLoc, 1718 Expr *InitList, 1719 SourceLocation EllipsisLoc) { 1720 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1721 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1722} 1723 1724/// \brief Handle a C++ member initializer using parentheses syntax. 1725MemInitResult 1726Sema::ActOnMemInitializer(Decl *ConstructorD, 1727 Scope *S, 1728 CXXScopeSpec &SS, 1729 IdentifierInfo *MemberOrBase, 1730 ParsedType TemplateTypeTy, 1731 SourceLocation IdLoc, 1732 SourceLocation LParenLoc, 1733 Expr **Args, unsigned NumArgs, 1734 SourceLocation RParenLoc, 1735 SourceLocation EllipsisLoc) { 1736 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1737 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1738 RParenLoc), 1739 EllipsisLoc); 1740} 1741 1742/// \brief Handle a C++ member initializer. 1743MemInitResult 1744Sema::BuildMemInitializer(Decl *ConstructorD, 1745 Scope *S, 1746 CXXScopeSpec &SS, 1747 IdentifierInfo *MemberOrBase, 1748 ParsedType TemplateTypeTy, 1749 SourceLocation IdLoc, 1750 const MultiInitializer &Args, 1751 SourceLocation EllipsisLoc) { 1752 if (!ConstructorD) 1753 return true; 1754 1755 AdjustDeclIfTemplate(ConstructorD); 1756 1757 CXXConstructorDecl *Constructor 1758 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1759 if (!Constructor) { 1760 // The user wrote a constructor initializer on a function that is 1761 // not a C++ constructor. Ignore the error for now, because we may 1762 // have more member initializers coming; we'll diagnose it just 1763 // once in ActOnMemInitializers. 1764 return true; 1765 } 1766 1767 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1768 1769 // C++ [class.base.init]p2: 1770 // Names in a mem-initializer-id are looked up in the scope of the 1771 // constructor's class and, if not found in that scope, are looked 1772 // up in the scope containing the constructor's definition. 1773 // [Note: if the constructor's class contains a member with the 1774 // same name as a direct or virtual base class of the class, a 1775 // mem-initializer-id naming the member or base class and composed 1776 // of a single identifier refers to the class member. A 1777 // mem-initializer-id for the hidden base class may be specified 1778 // using a qualified name. ] 1779 if (!SS.getScopeRep() && !TemplateTypeTy) { 1780 // Look for a member, first. 1781 FieldDecl *Member = 0; 1782 DeclContext::lookup_result Result 1783 = ClassDecl->lookup(MemberOrBase); 1784 if (Result.first != Result.second) { 1785 Member = dyn_cast<FieldDecl>(*Result.first); 1786 1787 if (Member) { 1788 if (EllipsisLoc.isValid()) 1789 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1790 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1791 1792 return BuildMemberInitializer(Member, Args, IdLoc); 1793 } 1794 1795 // Handle anonymous union case. 1796 if (IndirectFieldDecl* IndirectField 1797 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1798 if (EllipsisLoc.isValid()) 1799 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1800 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1801 1802 return BuildMemberInitializer(IndirectField, Args, IdLoc); 1803 } 1804 } 1805 } 1806 // It didn't name a member, so see if it names a class. 1807 QualType BaseType; 1808 TypeSourceInfo *TInfo = 0; 1809 1810 if (TemplateTypeTy) { 1811 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1812 } else { 1813 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1814 LookupParsedName(R, S, &SS); 1815 1816 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1817 if (!TyD) { 1818 if (R.isAmbiguous()) return true; 1819 1820 // We don't want access-control diagnostics here. 1821 R.suppressDiagnostics(); 1822 1823 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1824 bool NotUnknownSpecialization = false; 1825 DeclContext *DC = computeDeclContext(SS, false); 1826 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1827 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1828 1829 if (!NotUnknownSpecialization) { 1830 // When the scope specifier can refer to a member of an unknown 1831 // specialization, we take it as a type name. 1832 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1833 SS.getWithLocInContext(Context), 1834 *MemberOrBase, IdLoc); 1835 if (BaseType.isNull()) 1836 return true; 1837 1838 R.clear(); 1839 R.setLookupName(MemberOrBase); 1840 } 1841 } 1842 1843 // If no results were found, try to correct typos. 1844 TypoCorrection Corr; 1845 if (R.empty() && BaseType.isNull() && 1846 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1847 ClassDecl, false, CTC_NoKeywords))) { 1848 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1849 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1850 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1851 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1852 // We have found a non-static data member with a similar 1853 // name to what was typed; complain and initialize that 1854 // member. 1855 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1856 << MemberOrBase << true << CorrectedQuotedStr 1857 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1858 Diag(Member->getLocation(), diag::note_previous_decl) 1859 << CorrectedQuotedStr; 1860 1861 return BuildMemberInitializer(Member, Args, IdLoc); 1862 } 1863 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1864 const CXXBaseSpecifier *DirectBaseSpec; 1865 const CXXBaseSpecifier *VirtualBaseSpec; 1866 if (FindBaseInitializer(*this, ClassDecl, 1867 Context.getTypeDeclType(Type), 1868 DirectBaseSpec, VirtualBaseSpec)) { 1869 // We have found a direct or virtual base class with a 1870 // similar name to what was typed; complain and initialize 1871 // that base class. 1872 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1873 << MemberOrBase << false << CorrectedQuotedStr 1874 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1875 1876 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1877 : VirtualBaseSpec; 1878 Diag(BaseSpec->getSourceRange().getBegin(), 1879 diag::note_base_class_specified_here) 1880 << BaseSpec->getType() 1881 << BaseSpec->getSourceRange(); 1882 1883 TyD = Type; 1884 } 1885 } 1886 } 1887 1888 if (!TyD && BaseType.isNull()) { 1889 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1890 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1891 return true; 1892 } 1893 } 1894 1895 if (BaseType.isNull()) { 1896 BaseType = Context.getTypeDeclType(TyD); 1897 if (SS.isSet()) { 1898 NestedNameSpecifier *Qualifier = 1899 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1900 1901 // FIXME: preserve source range information 1902 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1903 } 1904 } 1905 } 1906 1907 if (!TInfo) 1908 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1909 1910 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1911} 1912 1913/// Checks a member initializer expression for cases where reference (or 1914/// pointer) members are bound to by-value parameters (or their addresses). 1915static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1916 Expr *Init, 1917 SourceLocation IdLoc) { 1918 QualType MemberTy = Member->getType(); 1919 1920 // We only handle pointers and references currently. 1921 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1922 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1923 return; 1924 1925 const bool IsPointer = MemberTy->isPointerType(); 1926 if (IsPointer) { 1927 if (const UnaryOperator *Op 1928 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1929 // The only case we're worried about with pointers requires taking the 1930 // address. 1931 if (Op->getOpcode() != UO_AddrOf) 1932 return; 1933 1934 Init = Op->getSubExpr(); 1935 } else { 1936 // We only handle address-of expression initializers for pointers. 1937 return; 1938 } 1939 } 1940 1941 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1942 // Taking the address of a temporary will be diagnosed as a hard error. 1943 if (IsPointer) 1944 return; 1945 1946 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1947 << Member << Init->getSourceRange(); 1948 } else if (const DeclRefExpr *DRE 1949 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1950 // We only warn when referring to a non-reference parameter declaration. 1951 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1952 if (!Parameter || Parameter->getType()->isReferenceType()) 1953 return; 1954 1955 S.Diag(Init->getExprLoc(), 1956 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1957 : diag::warn_bind_ref_member_to_parameter) 1958 << Member << Parameter << Init->getSourceRange(); 1959 } else { 1960 // Other initializers are fine. 1961 return; 1962 } 1963 1964 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1965 << (unsigned)IsPointer; 1966} 1967 1968/// Checks an initializer expression for use of uninitialized fields, such as 1969/// containing the field that is being initialized. Returns true if there is an 1970/// uninitialized field was used an updates the SourceLocation parameter; false 1971/// otherwise. 1972static bool InitExprContainsUninitializedFields(const Stmt *S, 1973 const ValueDecl *LhsField, 1974 SourceLocation *L) { 1975 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1976 1977 if (isa<CallExpr>(S)) { 1978 // Do not descend into function calls or constructors, as the use 1979 // of an uninitialized field may be valid. One would have to inspect 1980 // the contents of the function/ctor to determine if it is safe or not. 1981 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1982 // may be safe, depending on what the function/ctor does. 1983 return false; 1984 } 1985 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1986 const NamedDecl *RhsField = ME->getMemberDecl(); 1987 1988 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1989 // The member expression points to a static data member. 1990 assert(VD->isStaticDataMember() && 1991 "Member points to non-static data member!"); 1992 (void)VD; 1993 return false; 1994 } 1995 1996 if (isa<EnumConstantDecl>(RhsField)) { 1997 // The member expression points to an enum. 1998 return false; 1999 } 2000 2001 if (RhsField == LhsField) { 2002 // Initializing a field with itself. Throw a warning. 2003 // But wait; there are exceptions! 2004 // Exception #1: The field may not belong to this record. 2005 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2006 const Expr *base = ME->getBase(); 2007 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2008 // Even though the field matches, it does not belong to this record. 2009 return false; 2010 } 2011 // None of the exceptions triggered; return true to indicate an 2012 // uninitialized field was used. 2013 *L = ME->getMemberLoc(); 2014 return true; 2015 } 2016 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2017 // sizeof/alignof doesn't reference contents, do not warn. 2018 return false; 2019 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2020 // address-of doesn't reference contents (the pointer may be dereferenced 2021 // in the same expression but it would be rare; and weird). 2022 if (UOE->getOpcode() == UO_AddrOf) 2023 return false; 2024 } 2025 for (Stmt::const_child_range it = S->children(); it; ++it) { 2026 if (!*it) { 2027 // An expression such as 'member(arg ?: "")' may trigger this. 2028 continue; 2029 } 2030 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2031 return true; 2032 } 2033 return false; 2034} 2035 2036MemInitResult 2037Sema::BuildMemberInitializer(ValueDecl *Member, 2038 const MultiInitializer &Args, 2039 SourceLocation IdLoc) { 2040 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2041 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2042 assert((DirectMember || IndirectMember) && 2043 "Member must be a FieldDecl or IndirectFieldDecl"); 2044 2045 if (Member->isInvalidDecl()) 2046 return true; 2047 2048 // Diagnose value-uses of fields to initialize themselves, e.g. 2049 // foo(foo) 2050 // where foo is not also a parameter to the constructor. 2051 // TODO: implement -Wuninitialized and fold this into that framework. 2052 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2053 I != E; ++I) { 2054 SourceLocation L; 2055 Expr *Arg = *I; 2056 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2057 Arg = DIE->getInit(); 2058 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2059 // FIXME: Return true in the case when other fields are used before being 2060 // uninitialized. For example, let this field be the i'th field. When 2061 // initializing the i'th field, throw a warning if any of the >= i'th 2062 // fields are used, as they are not yet initialized. 2063 // Right now we are only handling the case where the i'th field uses 2064 // itself in its initializer. 2065 Diag(L, diag::warn_field_is_uninit); 2066 } 2067 } 2068 2069 bool HasDependentArg = Args.isTypeDependent(); 2070 2071 Expr *Init; 2072 if (Member->getType()->isDependentType() || HasDependentArg) { 2073 // Can't check initialization for a member of dependent type or when 2074 // any of the arguments are type-dependent expressions. 2075 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2076 2077 DiscardCleanupsInEvaluationContext(); 2078 } else { 2079 // Initialize the member. 2080 InitializedEntity MemberEntity = 2081 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2082 : InitializedEntity::InitializeMember(IndirectMember, 0); 2083 InitializationKind Kind = 2084 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2085 Args.getEndLoc()); 2086 2087 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2088 if (MemberInit.isInvalid()) 2089 return true; 2090 2091 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2092 2093 // C++0x [class.base.init]p7: 2094 // The initialization of each base and member constitutes a 2095 // full-expression. 2096 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2097 if (MemberInit.isInvalid()) 2098 return true; 2099 2100 // If we are in a dependent context, template instantiation will 2101 // perform this type-checking again. Just save the arguments that we 2102 // received in a ParenListExpr. 2103 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2104 // of the information that we have about the member 2105 // initializer. However, deconstructing the ASTs is a dicey process, 2106 // and this approach is far more likely to get the corner cases right. 2107 if (CurContext->isDependentContext()) { 2108 Init = Args.CreateInitExpr(Context, 2109 Member->getType().getNonReferenceType()); 2110 } else { 2111 Init = MemberInit.get(); 2112 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2113 } 2114 } 2115 2116 if (DirectMember) { 2117 return new (Context) CXXCtorInitializer(Context, DirectMember, 2118 IdLoc, Args.getStartLoc(), 2119 Init, Args.getEndLoc()); 2120 } else { 2121 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2122 IdLoc, Args.getStartLoc(), 2123 Init, Args.getEndLoc()); 2124 } 2125} 2126 2127MemInitResult 2128Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2129 const MultiInitializer &Args, 2130 SourceLocation NameLoc, 2131 CXXRecordDecl *ClassDecl) { 2132 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2133 if (!LangOpts.CPlusPlus0x) 2134 return Diag(Loc, diag::err_delegating_ctor) 2135 << TInfo->getTypeLoc().getLocalSourceRange(); 2136 Diag(Loc, diag::warn_cxx98_compat_delegating_ctor); 2137 2138 // Initialize the object. 2139 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2140 QualType(ClassDecl->getTypeForDecl(), 0)); 2141 InitializationKind Kind = 2142 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2143 Args.getEndLoc()); 2144 2145 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2146 if (DelegationInit.isInvalid()) 2147 return true; 2148 2149 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2150 CXXConstructorDecl *Constructor 2151 = ConExpr->getConstructor(); 2152 assert(Constructor && "Delegating constructor with no target?"); 2153 2154 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2155 2156 // C++0x [class.base.init]p7: 2157 // The initialization of each base and member constitutes a 2158 // full-expression. 2159 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2160 if (DelegationInit.isInvalid()) 2161 return true; 2162 2163 assert(!CurContext->isDependentContext()); 2164 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2165 Constructor, 2166 DelegationInit.takeAs<Expr>(), 2167 Args.getEndLoc()); 2168} 2169 2170MemInitResult 2171Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2172 const MultiInitializer &Args, 2173 CXXRecordDecl *ClassDecl, 2174 SourceLocation EllipsisLoc) { 2175 bool HasDependentArg = Args.isTypeDependent(); 2176 2177 SourceLocation BaseLoc 2178 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2179 2180 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2181 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2182 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2183 2184 // C++ [class.base.init]p2: 2185 // [...] Unless the mem-initializer-id names a nonstatic data 2186 // member of the constructor's class or a direct or virtual base 2187 // of that class, the mem-initializer is ill-formed. A 2188 // mem-initializer-list can initialize a base class using any 2189 // name that denotes that base class type. 2190 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2191 2192 if (EllipsisLoc.isValid()) { 2193 // This is a pack expansion. 2194 if (!BaseType->containsUnexpandedParameterPack()) { 2195 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2196 << SourceRange(BaseLoc, Args.getEndLoc()); 2197 2198 EllipsisLoc = SourceLocation(); 2199 } 2200 } else { 2201 // Check for any unexpanded parameter packs. 2202 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2203 return true; 2204 2205 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2206 return true; 2207 } 2208 2209 // Check for direct and virtual base classes. 2210 const CXXBaseSpecifier *DirectBaseSpec = 0; 2211 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2212 if (!Dependent) { 2213 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2214 BaseType)) 2215 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2216 2217 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2218 VirtualBaseSpec); 2219 2220 // C++ [base.class.init]p2: 2221 // Unless the mem-initializer-id names a nonstatic data member of the 2222 // constructor's class or a direct or virtual base of that class, the 2223 // mem-initializer is ill-formed. 2224 if (!DirectBaseSpec && !VirtualBaseSpec) { 2225 // If the class has any dependent bases, then it's possible that 2226 // one of those types will resolve to the same type as 2227 // BaseType. Therefore, just treat this as a dependent base 2228 // class initialization. FIXME: Should we try to check the 2229 // initialization anyway? It seems odd. 2230 if (ClassDecl->hasAnyDependentBases()) 2231 Dependent = true; 2232 else 2233 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2234 << BaseType << Context.getTypeDeclType(ClassDecl) 2235 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2236 } 2237 } 2238 2239 if (Dependent) { 2240 // Can't check initialization for a base of dependent type or when 2241 // any of the arguments are type-dependent expressions. 2242 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2243 2244 DiscardCleanupsInEvaluationContext(); 2245 2246 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2247 /*IsVirtual=*/false, 2248 Args.getStartLoc(), BaseInit, 2249 Args.getEndLoc(), EllipsisLoc); 2250 } 2251 2252 // C++ [base.class.init]p2: 2253 // If a mem-initializer-id is ambiguous because it designates both 2254 // a direct non-virtual base class and an inherited virtual base 2255 // class, the mem-initializer is ill-formed. 2256 if (DirectBaseSpec && VirtualBaseSpec) 2257 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2258 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2259 2260 CXXBaseSpecifier *BaseSpec 2261 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2262 if (!BaseSpec) 2263 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2264 2265 // Initialize the base. 2266 InitializedEntity BaseEntity = 2267 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2268 InitializationKind Kind = 2269 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2270 Args.getEndLoc()); 2271 2272 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2273 if (BaseInit.isInvalid()) 2274 return true; 2275 2276 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2277 2278 // C++0x [class.base.init]p7: 2279 // The initialization of each base and member constitutes a 2280 // full-expression. 2281 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2282 if (BaseInit.isInvalid()) 2283 return true; 2284 2285 // If we are in a dependent context, template instantiation will 2286 // perform this type-checking again. Just save the arguments that we 2287 // received in a ParenListExpr. 2288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2289 // of the information that we have about the base 2290 // initializer. However, deconstructing the ASTs is a dicey process, 2291 // and this approach is far more likely to get the corner cases right. 2292 if (CurContext->isDependentContext()) 2293 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2294 2295 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2296 BaseSpec->isVirtual(), 2297 Args.getStartLoc(), 2298 BaseInit.takeAs<Expr>(), 2299 Args.getEndLoc(), EllipsisLoc); 2300} 2301 2302// Create a static_cast\<T&&>(expr). 2303static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2304 QualType ExprType = E->getType(); 2305 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2306 SourceLocation ExprLoc = E->getLocStart(); 2307 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2308 TargetType, ExprLoc); 2309 2310 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2311 SourceRange(ExprLoc, ExprLoc), 2312 E->getSourceRange()).take(); 2313} 2314 2315/// ImplicitInitializerKind - How an implicit base or member initializer should 2316/// initialize its base or member. 2317enum ImplicitInitializerKind { 2318 IIK_Default, 2319 IIK_Copy, 2320 IIK_Move 2321}; 2322 2323static bool 2324BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2325 ImplicitInitializerKind ImplicitInitKind, 2326 CXXBaseSpecifier *BaseSpec, 2327 bool IsInheritedVirtualBase, 2328 CXXCtorInitializer *&CXXBaseInit) { 2329 InitializedEntity InitEntity 2330 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2331 IsInheritedVirtualBase); 2332 2333 ExprResult BaseInit; 2334 2335 switch (ImplicitInitKind) { 2336 case IIK_Default: { 2337 InitializationKind InitKind 2338 = InitializationKind::CreateDefault(Constructor->getLocation()); 2339 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2340 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2341 MultiExprArg(SemaRef, 0, 0)); 2342 break; 2343 } 2344 2345 case IIK_Move: 2346 case IIK_Copy: { 2347 bool Moving = ImplicitInitKind == IIK_Move; 2348 ParmVarDecl *Param = Constructor->getParamDecl(0); 2349 QualType ParamType = Param->getType().getNonReferenceType(); 2350 2351 Expr *CopyCtorArg = 2352 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2353 Constructor->getLocation(), ParamType, 2354 VK_LValue, 0); 2355 2356 // Cast to the base class to avoid ambiguities. 2357 QualType ArgTy = 2358 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2359 ParamType.getQualifiers()); 2360 2361 if (Moving) { 2362 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2363 } 2364 2365 CXXCastPath BasePath; 2366 BasePath.push_back(BaseSpec); 2367 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2368 CK_UncheckedDerivedToBase, 2369 Moving ? VK_XValue : VK_LValue, 2370 &BasePath).take(); 2371 2372 InitializationKind InitKind 2373 = InitializationKind::CreateDirect(Constructor->getLocation(), 2374 SourceLocation(), SourceLocation()); 2375 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2376 &CopyCtorArg, 1); 2377 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2378 MultiExprArg(&CopyCtorArg, 1)); 2379 break; 2380 } 2381 } 2382 2383 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2384 if (BaseInit.isInvalid()) 2385 return true; 2386 2387 CXXBaseInit = 2388 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2389 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2390 SourceLocation()), 2391 BaseSpec->isVirtual(), 2392 SourceLocation(), 2393 BaseInit.takeAs<Expr>(), 2394 SourceLocation(), 2395 SourceLocation()); 2396 2397 return false; 2398} 2399 2400static bool RefersToRValueRef(Expr *MemRef) { 2401 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2402 return Referenced->getType()->isRValueReferenceType(); 2403} 2404 2405static bool 2406BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2407 ImplicitInitializerKind ImplicitInitKind, 2408 FieldDecl *Field, IndirectFieldDecl *Indirect, 2409 CXXCtorInitializer *&CXXMemberInit) { 2410 if (Field->isInvalidDecl()) 2411 return true; 2412 2413 SourceLocation Loc = Constructor->getLocation(); 2414 2415 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2416 bool Moving = ImplicitInitKind == IIK_Move; 2417 ParmVarDecl *Param = Constructor->getParamDecl(0); 2418 QualType ParamType = Param->getType().getNonReferenceType(); 2419 2420 // Suppress copying zero-width bitfields. 2421 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2422 return false; 2423 2424 Expr *MemberExprBase = 2425 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2426 Loc, ParamType, VK_LValue, 0); 2427 2428 if (Moving) { 2429 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2430 } 2431 2432 // Build a reference to this field within the parameter. 2433 CXXScopeSpec SS; 2434 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2435 Sema::LookupMemberName); 2436 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2437 : cast<ValueDecl>(Field), AS_public); 2438 MemberLookup.resolveKind(); 2439 ExprResult CtorArg 2440 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2441 ParamType, Loc, 2442 /*IsArrow=*/false, 2443 SS, 2444 /*FirstQualifierInScope=*/0, 2445 MemberLookup, 2446 /*TemplateArgs=*/0); 2447 if (CtorArg.isInvalid()) 2448 return true; 2449 2450 // C++11 [class.copy]p15: 2451 // - if a member m has rvalue reference type T&&, it is direct-initialized 2452 // with static_cast<T&&>(x.m); 2453 if (RefersToRValueRef(CtorArg.get())) { 2454 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2455 } 2456 2457 // When the field we are copying is an array, create index variables for 2458 // each dimension of the array. We use these index variables to subscript 2459 // the source array, and other clients (e.g., CodeGen) will perform the 2460 // necessary iteration with these index variables. 2461 SmallVector<VarDecl *, 4> IndexVariables; 2462 QualType BaseType = Field->getType(); 2463 QualType SizeType = SemaRef.Context.getSizeType(); 2464 bool InitializingArray = false; 2465 while (const ConstantArrayType *Array 2466 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2467 InitializingArray = true; 2468 // Create the iteration variable for this array index. 2469 IdentifierInfo *IterationVarName = 0; 2470 { 2471 llvm::SmallString<8> Str; 2472 llvm::raw_svector_ostream OS(Str); 2473 OS << "__i" << IndexVariables.size(); 2474 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2475 } 2476 VarDecl *IterationVar 2477 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2478 IterationVarName, SizeType, 2479 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2480 SC_None, SC_None); 2481 IndexVariables.push_back(IterationVar); 2482 2483 // Create a reference to the iteration variable. 2484 ExprResult IterationVarRef 2485 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2486 assert(!IterationVarRef.isInvalid() && 2487 "Reference to invented variable cannot fail!"); 2488 2489 // Subscript the array with this iteration variable. 2490 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2491 IterationVarRef.take(), 2492 Loc); 2493 if (CtorArg.isInvalid()) 2494 return true; 2495 2496 BaseType = Array->getElementType(); 2497 } 2498 2499 // The array subscript expression is an lvalue, which is wrong for moving. 2500 if (Moving && InitializingArray) 2501 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2502 2503 // Construct the entity that we will be initializing. For an array, this 2504 // will be first element in the array, which may require several levels 2505 // of array-subscript entities. 2506 SmallVector<InitializedEntity, 4> Entities; 2507 Entities.reserve(1 + IndexVariables.size()); 2508 if (Indirect) 2509 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2510 else 2511 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2512 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2513 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2514 0, 2515 Entities.back())); 2516 2517 // Direct-initialize to use the copy constructor. 2518 InitializationKind InitKind = 2519 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2520 2521 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2522 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2523 &CtorArgE, 1); 2524 2525 ExprResult MemberInit 2526 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2527 MultiExprArg(&CtorArgE, 1)); 2528 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2529 if (MemberInit.isInvalid()) 2530 return true; 2531 2532 if (Indirect) { 2533 assert(IndexVariables.size() == 0 && 2534 "Indirect field improperly initialized"); 2535 CXXMemberInit 2536 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2537 Loc, Loc, 2538 MemberInit.takeAs<Expr>(), 2539 Loc); 2540 } else 2541 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2542 Loc, MemberInit.takeAs<Expr>(), 2543 Loc, 2544 IndexVariables.data(), 2545 IndexVariables.size()); 2546 return false; 2547 } 2548 2549 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2550 2551 QualType FieldBaseElementType = 2552 SemaRef.Context.getBaseElementType(Field->getType()); 2553 2554 if (FieldBaseElementType->isRecordType()) { 2555 InitializedEntity InitEntity 2556 = Indirect? InitializedEntity::InitializeMember(Indirect) 2557 : InitializedEntity::InitializeMember(Field); 2558 InitializationKind InitKind = 2559 InitializationKind::CreateDefault(Loc); 2560 2561 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2562 ExprResult MemberInit = 2563 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2564 2565 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2566 if (MemberInit.isInvalid()) 2567 return true; 2568 2569 if (Indirect) 2570 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2571 Indirect, Loc, 2572 Loc, 2573 MemberInit.get(), 2574 Loc); 2575 else 2576 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2577 Field, Loc, Loc, 2578 MemberInit.get(), 2579 Loc); 2580 return false; 2581 } 2582 2583 if (!Field->getParent()->isUnion()) { 2584 if (FieldBaseElementType->isReferenceType()) { 2585 SemaRef.Diag(Constructor->getLocation(), 2586 diag::err_uninitialized_member_in_ctor) 2587 << (int)Constructor->isImplicit() 2588 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2589 << 0 << Field->getDeclName(); 2590 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2591 return true; 2592 } 2593 2594 if (FieldBaseElementType.isConstQualified()) { 2595 SemaRef.Diag(Constructor->getLocation(), 2596 diag::err_uninitialized_member_in_ctor) 2597 << (int)Constructor->isImplicit() 2598 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2599 << 1 << Field->getDeclName(); 2600 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2601 return true; 2602 } 2603 } 2604 2605 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2606 FieldBaseElementType->isObjCRetainableType() && 2607 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2608 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2609 // Instant objects: 2610 // Default-initialize Objective-C pointers to NULL. 2611 CXXMemberInit 2612 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2613 Loc, Loc, 2614 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2615 Loc); 2616 return false; 2617 } 2618 2619 // Nothing to initialize. 2620 CXXMemberInit = 0; 2621 return false; 2622} 2623 2624namespace { 2625struct BaseAndFieldInfo { 2626 Sema &S; 2627 CXXConstructorDecl *Ctor; 2628 bool AnyErrorsInInits; 2629 ImplicitInitializerKind IIK; 2630 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2631 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2632 2633 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2634 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2635 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2636 if (Generated && Ctor->isCopyConstructor()) 2637 IIK = IIK_Copy; 2638 else if (Generated && Ctor->isMoveConstructor()) 2639 IIK = IIK_Move; 2640 else 2641 IIK = IIK_Default; 2642 } 2643}; 2644} 2645 2646/// \brief Determine whether the given indirect field declaration is somewhere 2647/// within an anonymous union. 2648static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2649 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2650 CEnd = F->chain_end(); 2651 C != CEnd; ++C) 2652 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2653 if (Record->isUnion()) 2654 return true; 2655 2656 return false; 2657} 2658 2659static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2660 FieldDecl *Field, 2661 IndirectFieldDecl *Indirect = 0) { 2662 2663 // Overwhelmingly common case: we have a direct initializer for this field. 2664 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2665 Info.AllToInit.push_back(Init); 2666 return false; 2667 } 2668 2669 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2670 // has a brace-or-equal-initializer, the entity is initialized as specified 2671 // in [dcl.init]. 2672 if (Field->hasInClassInitializer()) { 2673 CXXCtorInitializer *Init; 2674 if (Indirect) 2675 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2676 SourceLocation(), 2677 SourceLocation(), 0, 2678 SourceLocation()); 2679 else 2680 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2681 SourceLocation(), 2682 SourceLocation(), 0, 2683 SourceLocation()); 2684 Info.AllToInit.push_back(Init); 2685 return false; 2686 } 2687 2688 // Don't build an implicit initializer for union members if none was 2689 // explicitly specified. 2690 if (Field->getParent()->isUnion() || 2691 (Indirect && isWithinAnonymousUnion(Indirect))) 2692 return false; 2693 2694 // Don't try to build an implicit initializer if there were semantic 2695 // errors in any of the initializers (and therefore we might be 2696 // missing some that the user actually wrote). 2697 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2698 return false; 2699 2700 CXXCtorInitializer *Init = 0; 2701 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2702 Indirect, Init)) 2703 return true; 2704 2705 if (Init) 2706 Info.AllToInit.push_back(Init); 2707 2708 return false; 2709} 2710 2711bool 2712Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2713 CXXCtorInitializer *Initializer) { 2714 assert(Initializer->isDelegatingInitializer()); 2715 Constructor->setNumCtorInitializers(1); 2716 CXXCtorInitializer **initializer = 2717 new (Context) CXXCtorInitializer*[1]; 2718 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2719 Constructor->setCtorInitializers(initializer); 2720 2721 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2722 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2723 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2724 } 2725 2726 DelegatingCtorDecls.push_back(Constructor); 2727 2728 return false; 2729} 2730 2731bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2732 CXXCtorInitializer **Initializers, 2733 unsigned NumInitializers, 2734 bool AnyErrors) { 2735 if (Constructor->isDependentContext()) { 2736 // Just store the initializers as written, they will be checked during 2737 // instantiation. 2738 if (NumInitializers > 0) { 2739 Constructor->setNumCtorInitializers(NumInitializers); 2740 CXXCtorInitializer **baseOrMemberInitializers = 2741 new (Context) CXXCtorInitializer*[NumInitializers]; 2742 memcpy(baseOrMemberInitializers, Initializers, 2743 NumInitializers * sizeof(CXXCtorInitializer*)); 2744 Constructor->setCtorInitializers(baseOrMemberInitializers); 2745 } 2746 2747 return false; 2748 } 2749 2750 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2751 2752 // We need to build the initializer AST according to order of construction 2753 // and not what user specified in the Initializers list. 2754 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2755 if (!ClassDecl) 2756 return true; 2757 2758 bool HadError = false; 2759 2760 for (unsigned i = 0; i < NumInitializers; i++) { 2761 CXXCtorInitializer *Member = Initializers[i]; 2762 2763 if (Member->isBaseInitializer()) 2764 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2765 else 2766 Info.AllBaseFields[Member->getAnyMember()] = Member; 2767 } 2768 2769 // Keep track of the direct virtual bases. 2770 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2771 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2772 E = ClassDecl->bases_end(); I != E; ++I) { 2773 if (I->isVirtual()) 2774 DirectVBases.insert(I); 2775 } 2776 2777 // Push virtual bases before others. 2778 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2779 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2780 2781 if (CXXCtorInitializer *Value 2782 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2783 Info.AllToInit.push_back(Value); 2784 } else if (!AnyErrors) { 2785 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2786 CXXCtorInitializer *CXXBaseInit; 2787 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2788 VBase, IsInheritedVirtualBase, 2789 CXXBaseInit)) { 2790 HadError = true; 2791 continue; 2792 } 2793 2794 Info.AllToInit.push_back(CXXBaseInit); 2795 } 2796 } 2797 2798 // Non-virtual bases. 2799 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2800 E = ClassDecl->bases_end(); Base != E; ++Base) { 2801 // Virtuals are in the virtual base list and already constructed. 2802 if (Base->isVirtual()) 2803 continue; 2804 2805 if (CXXCtorInitializer *Value 2806 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2807 Info.AllToInit.push_back(Value); 2808 } else if (!AnyErrors) { 2809 CXXCtorInitializer *CXXBaseInit; 2810 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2811 Base, /*IsInheritedVirtualBase=*/false, 2812 CXXBaseInit)) { 2813 HadError = true; 2814 continue; 2815 } 2816 2817 Info.AllToInit.push_back(CXXBaseInit); 2818 } 2819 } 2820 2821 // Fields. 2822 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2823 MemEnd = ClassDecl->decls_end(); 2824 Mem != MemEnd; ++Mem) { 2825 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2826 // C++ [class.bit]p2: 2827 // A declaration for a bit-field that omits the identifier declares an 2828 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2829 // initialized. 2830 if (F->isUnnamedBitfield()) 2831 continue; 2832 2833 if (F->getType()->isIncompleteArrayType()) { 2834 assert(ClassDecl->hasFlexibleArrayMember() && 2835 "Incomplete array type is not valid"); 2836 continue; 2837 } 2838 2839 // If we're not generating the implicit copy/move constructor, then we'll 2840 // handle anonymous struct/union fields based on their individual 2841 // indirect fields. 2842 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2843 continue; 2844 2845 if (CollectFieldInitializer(*this, Info, F)) 2846 HadError = true; 2847 continue; 2848 } 2849 2850 // Beyond this point, we only consider default initialization. 2851 if (Info.IIK != IIK_Default) 2852 continue; 2853 2854 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2855 if (F->getType()->isIncompleteArrayType()) { 2856 assert(ClassDecl->hasFlexibleArrayMember() && 2857 "Incomplete array type is not valid"); 2858 continue; 2859 } 2860 2861 // Initialize each field of an anonymous struct individually. 2862 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2863 HadError = true; 2864 2865 continue; 2866 } 2867 } 2868 2869 NumInitializers = Info.AllToInit.size(); 2870 if (NumInitializers > 0) { 2871 Constructor->setNumCtorInitializers(NumInitializers); 2872 CXXCtorInitializer **baseOrMemberInitializers = 2873 new (Context) CXXCtorInitializer*[NumInitializers]; 2874 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2875 NumInitializers * sizeof(CXXCtorInitializer*)); 2876 Constructor->setCtorInitializers(baseOrMemberInitializers); 2877 2878 // Constructors implicitly reference the base and member 2879 // destructors. 2880 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2881 Constructor->getParent()); 2882 } 2883 2884 return HadError; 2885} 2886 2887static void *GetKeyForTopLevelField(FieldDecl *Field) { 2888 // For anonymous unions, use the class declaration as the key. 2889 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2890 if (RT->getDecl()->isAnonymousStructOrUnion()) 2891 return static_cast<void *>(RT->getDecl()); 2892 } 2893 return static_cast<void *>(Field); 2894} 2895 2896static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2897 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2898} 2899 2900static void *GetKeyForMember(ASTContext &Context, 2901 CXXCtorInitializer *Member) { 2902 if (!Member->isAnyMemberInitializer()) 2903 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2904 2905 // For fields injected into the class via declaration of an anonymous union, 2906 // use its anonymous union class declaration as the unique key. 2907 FieldDecl *Field = Member->getAnyMember(); 2908 2909 // If the field is a member of an anonymous struct or union, our key 2910 // is the anonymous record decl that's a direct child of the class. 2911 RecordDecl *RD = Field->getParent(); 2912 if (RD->isAnonymousStructOrUnion()) { 2913 while (true) { 2914 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2915 if (Parent->isAnonymousStructOrUnion()) 2916 RD = Parent; 2917 else 2918 break; 2919 } 2920 2921 return static_cast<void *>(RD); 2922 } 2923 2924 return static_cast<void *>(Field); 2925} 2926 2927static void 2928DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2929 const CXXConstructorDecl *Constructor, 2930 CXXCtorInitializer **Inits, 2931 unsigned NumInits) { 2932 if (Constructor->getDeclContext()->isDependentContext()) 2933 return; 2934 2935 // Don't check initializers order unless the warning is enabled at the 2936 // location of at least one initializer. 2937 bool ShouldCheckOrder = false; 2938 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2939 CXXCtorInitializer *Init = Inits[InitIndex]; 2940 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2941 Init->getSourceLocation()) 2942 != DiagnosticsEngine::Ignored) { 2943 ShouldCheckOrder = true; 2944 break; 2945 } 2946 } 2947 if (!ShouldCheckOrder) 2948 return; 2949 2950 // Build the list of bases and members in the order that they'll 2951 // actually be initialized. The explicit initializers should be in 2952 // this same order but may be missing things. 2953 SmallVector<const void*, 32> IdealInitKeys; 2954 2955 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2956 2957 // 1. Virtual bases. 2958 for (CXXRecordDecl::base_class_const_iterator VBase = 2959 ClassDecl->vbases_begin(), 2960 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2961 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2962 2963 // 2. Non-virtual bases. 2964 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2965 E = ClassDecl->bases_end(); Base != E; ++Base) { 2966 if (Base->isVirtual()) 2967 continue; 2968 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2969 } 2970 2971 // 3. Direct fields. 2972 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2973 E = ClassDecl->field_end(); Field != E; ++Field) { 2974 if (Field->isUnnamedBitfield()) 2975 continue; 2976 2977 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2978 } 2979 2980 unsigned NumIdealInits = IdealInitKeys.size(); 2981 unsigned IdealIndex = 0; 2982 2983 CXXCtorInitializer *PrevInit = 0; 2984 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2985 CXXCtorInitializer *Init = Inits[InitIndex]; 2986 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2987 2988 // Scan forward to try to find this initializer in the idealized 2989 // initializers list. 2990 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2991 if (InitKey == IdealInitKeys[IdealIndex]) 2992 break; 2993 2994 // If we didn't find this initializer, it must be because we 2995 // scanned past it on a previous iteration. That can only 2996 // happen if we're out of order; emit a warning. 2997 if (IdealIndex == NumIdealInits && PrevInit) { 2998 Sema::SemaDiagnosticBuilder D = 2999 SemaRef.Diag(PrevInit->getSourceLocation(), 3000 diag::warn_initializer_out_of_order); 3001 3002 if (PrevInit->isAnyMemberInitializer()) 3003 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3004 else 3005 D << 1 << PrevInit->getBaseClassInfo()->getType(); 3006 3007 if (Init->isAnyMemberInitializer()) 3008 D << 0 << Init->getAnyMember()->getDeclName(); 3009 else 3010 D << 1 << Init->getBaseClassInfo()->getType(); 3011 3012 // Move back to the initializer's location in the ideal list. 3013 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3014 if (InitKey == IdealInitKeys[IdealIndex]) 3015 break; 3016 3017 assert(IdealIndex != NumIdealInits && 3018 "initializer not found in initializer list"); 3019 } 3020 3021 PrevInit = Init; 3022 } 3023} 3024 3025namespace { 3026bool CheckRedundantInit(Sema &S, 3027 CXXCtorInitializer *Init, 3028 CXXCtorInitializer *&PrevInit) { 3029 if (!PrevInit) { 3030 PrevInit = Init; 3031 return false; 3032 } 3033 3034 if (FieldDecl *Field = Init->getMember()) 3035 S.Diag(Init->getSourceLocation(), 3036 diag::err_multiple_mem_initialization) 3037 << Field->getDeclName() 3038 << Init->getSourceRange(); 3039 else { 3040 const Type *BaseClass = Init->getBaseClass(); 3041 assert(BaseClass && "neither field nor base"); 3042 S.Diag(Init->getSourceLocation(), 3043 diag::err_multiple_base_initialization) 3044 << QualType(BaseClass, 0) 3045 << Init->getSourceRange(); 3046 } 3047 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3048 << 0 << PrevInit->getSourceRange(); 3049 3050 return true; 3051} 3052 3053typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3054typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3055 3056bool CheckRedundantUnionInit(Sema &S, 3057 CXXCtorInitializer *Init, 3058 RedundantUnionMap &Unions) { 3059 FieldDecl *Field = Init->getAnyMember(); 3060 RecordDecl *Parent = Field->getParent(); 3061 if (!Parent->isAnonymousStructOrUnion()) 3062 return false; 3063 3064 NamedDecl *Child = Field; 3065 do { 3066 if (Parent->isUnion()) { 3067 UnionEntry &En = Unions[Parent]; 3068 if (En.first && En.first != Child) { 3069 S.Diag(Init->getSourceLocation(), 3070 diag::err_multiple_mem_union_initialization) 3071 << Field->getDeclName() 3072 << Init->getSourceRange(); 3073 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3074 << 0 << En.second->getSourceRange(); 3075 return true; 3076 } else if (!En.first) { 3077 En.first = Child; 3078 En.second = Init; 3079 } 3080 } 3081 3082 Child = Parent; 3083 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3084 } while (Parent->isAnonymousStructOrUnion()); 3085 3086 return false; 3087} 3088} 3089 3090/// ActOnMemInitializers - Handle the member initializers for a constructor. 3091void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3092 SourceLocation ColonLoc, 3093 CXXCtorInitializer **meminits, 3094 unsigned NumMemInits, 3095 bool AnyErrors) { 3096 if (!ConstructorDecl) 3097 return; 3098 3099 AdjustDeclIfTemplate(ConstructorDecl); 3100 3101 CXXConstructorDecl *Constructor 3102 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3103 3104 if (!Constructor) { 3105 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3106 return; 3107 } 3108 3109 CXXCtorInitializer **MemInits = 3110 reinterpret_cast<CXXCtorInitializer **>(meminits); 3111 3112 // Mapping for the duplicate initializers check. 3113 // For member initializers, this is keyed with a FieldDecl*. 3114 // For base initializers, this is keyed with a Type*. 3115 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3116 3117 // Mapping for the inconsistent anonymous-union initializers check. 3118 RedundantUnionMap MemberUnions; 3119 3120 bool HadError = false; 3121 for (unsigned i = 0; i < NumMemInits; i++) { 3122 CXXCtorInitializer *Init = MemInits[i]; 3123 3124 // Set the source order index. 3125 Init->setSourceOrder(i); 3126 3127 if (Init->isAnyMemberInitializer()) { 3128 FieldDecl *Field = Init->getAnyMember(); 3129 if (CheckRedundantInit(*this, Init, Members[Field]) || 3130 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3131 HadError = true; 3132 } else if (Init->isBaseInitializer()) { 3133 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3134 if (CheckRedundantInit(*this, Init, Members[Key])) 3135 HadError = true; 3136 } else { 3137 assert(Init->isDelegatingInitializer()); 3138 // This must be the only initializer 3139 if (i != 0 || NumMemInits > 1) { 3140 Diag(MemInits[0]->getSourceLocation(), 3141 diag::err_delegating_initializer_alone) 3142 << MemInits[0]->getSourceRange(); 3143 HadError = true; 3144 // We will treat this as being the only initializer. 3145 } 3146 SetDelegatingInitializer(Constructor, MemInits[i]); 3147 // Return immediately as the initializer is set. 3148 return; 3149 } 3150 } 3151 3152 if (HadError) 3153 return; 3154 3155 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3156 3157 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3158} 3159 3160void 3161Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3162 CXXRecordDecl *ClassDecl) { 3163 // Ignore dependent contexts. Also ignore unions, since their members never 3164 // have destructors implicitly called. 3165 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3166 return; 3167 3168 // FIXME: all the access-control diagnostics are positioned on the 3169 // field/base declaration. That's probably good; that said, the 3170 // user might reasonably want to know why the destructor is being 3171 // emitted, and we currently don't say. 3172 3173 // Non-static data members. 3174 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3175 E = ClassDecl->field_end(); I != E; ++I) { 3176 FieldDecl *Field = *I; 3177 if (Field->isInvalidDecl()) 3178 continue; 3179 QualType FieldType = Context.getBaseElementType(Field->getType()); 3180 3181 const RecordType* RT = FieldType->getAs<RecordType>(); 3182 if (!RT) 3183 continue; 3184 3185 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3186 if (FieldClassDecl->isInvalidDecl()) 3187 continue; 3188 if (FieldClassDecl->hasTrivialDestructor()) 3189 continue; 3190 3191 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3192 assert(Dtor && "No dtor found for FieldClassDecl!"); 3193 CheckDestructorAccess(Field->getLocation(), Dtor, 3194 PDiag(diag::err_access_dtor_field) 3195 << Field->getDeclName() 3196 << FieldType); 3197 3198 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3199 } 3200 3201 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3202 3203 // Bases. 3204 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3205 E = ClassDecl->bases_end(); Base != E; ++Base) { 3206 // Bases are always records in a well-formed non-dependent class. 3207 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3208 3209 // Remember direct virtual bases. 3210 if (Base->isVirtual()) 3211 DirectVirtualBases.insert(RT); 3212 3213 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3214 // If our base class is invalid, we probably can't get its dtor anyway. 3215 if (BaseClassDecl->isInvalidDecl()) 3216 continue; 3217 // Ignore trivial destructors. 3218 if (BaseClassDecl->hasTrivialDestructor()) 3219 continue; 3220 3221 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3222 assert(Dtor && "No dtor found for BaseClassDecl!"); 3223 3224 // FIXME: caret should be on the start of the class name 3225 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3226 PDiag(diag::err_access_dtor_base) 3227 << Base->getType() 3228 << Base->getSourceRange()); 3229 3230 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3231 } 3232 3233 // Virtual bases. 3234 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3235 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3236 3237 // Bases are always records in a well-formed non-dependent class. 3238 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3239 3240 // Ignore direct virtual bases. 3241 if (DirectVirtualBases.count(RT)) 3242 continue; 3243 3244 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3245 // If our base class is invalid, we probably can't get its dtor anyway. 3246 if (BaseClassDecl->isInvalidDecl()) 3247 continue; 3248 // Ignore trivial destructors. 3249 if (BaseClassDecl->hasTrivialDestructor()) 3250 continue; 3251 3252 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3253 assert(Dtor && "No dtor found for BaseClassDecl!"); 3254 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3255 PDiag(diag::err_access_dtor_vbase) 3256 << VBase->getType()); 3257 3258 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3259 } 3260} 3261 3262void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3263 if (!CDtorDecl) 3264 return; 3265 3266 if (CXXConstructorDecl *Constructor 3267 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3268 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3269} 3270 3271bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3272 unsigned DiagID, AbstractDiagSelID SelID) { 3273 if (SelID == -1) 3274 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3275 else 3276 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3277} 3278 3279bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3280 const PartialDiagnostic &PD) { 3281 if (!getLangOptions().CPlusPlus) 3282 return false; 3283 3284 if (const ArrayType *AT = Context.getAsArrayType(T)) 3285 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3286 3287 if (const PointerType *PT = T->getAs<PointerType>()) { 3288 // Find the innermost pointer type. 3289 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3290 PT = T; 3291 3292 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3293 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3294 } 3295 3296 const RecordType *RT = T->getAs<RecordType>(); 3297 if (!RT) 3298 return false; 3299 3300 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3301 3302 // We can't answer whether something is abstract until it has a 3303 // definition. If it's currently being defined, we'll walk back 3304 // over all the declarations when we have a full definition. 3305 const CXXRecordDecl *Def = RD->getDefinition(); 3306 if (!Def || Def->isBeingDefined()) 3307 return false; 3308 3309 if (!RD->isAbstract()) 3310 return false; 3311 3312 Diag(Loc, PD) << RD->getDeclName(); 3313 DiagnoseAbstractType(RD); 3314 3315 return true; 3316} 3317 3318void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3319 // Check if we've already emitted the list of pure virtual functions 3320 // for this class. 3321 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3322 return; 3323 3324 CXXFinalOverriderMap FinalOverriders; 3325 RD->getFinalOverriders(FinalOverriders); 3326 3327 // Keep a set of seen pure methods so we won't diagnose the same method 3328 // more than once. 3329 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3330 3331 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3332 MEnd = FinalOverriders.end(); 3333 M != MEnd; 3334 ++M) { 3335 for (OverridingMethods::iterator SO = M->second.begin(), 3336 SOEnd = M->second.end(); 3337 SO != SOEnd; ++SO) { 3338 // C++ [class.abstract]p4: 3339 // A class is abstract if it contains or inherits at least one 3340 // pure virtual function for which the final overrider is pure 3341 // virtual. 3342 3343 // 3344 if (SO->second.size() != 1) 3345 continue; 3346 3347 if (!SO->second.front().Method->isPure()) 3348 continue; 3349 3350 if (!SeenPureMethods.insert(SO->second.front().Method)) 3351 continue; 3352 3353 Diag(SO->second.front().Method->getLocation(), 3354 diag::note_pure_virtual_function) 3355 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3356 } 3357 } 3358 3359 if (!PureVirtualClassDiagSet) 3360 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3361 PureVirtualClassDiagSet->insert(RD); 3362} 3363 3364namespace { 3365struct AbstractUsageInfo { 3366 Sema &S; 3367 CXXRecordDecl *Record; 3368 CanQualType AbstractType; 3369 bool Invalid; 3370 3371 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3372 : S(S), Record(Record), 3373 AbstractType(S.Context.getCanonicalType( 3374 S.Context.getTypeDeclType(Record))), 3375 Invalid(false) {} 3376 3377 void DiagnoseAbstractType() { 3378 if (Invalid) return; 3379 S.DiagnoseAbstractType(Record); 3380 Invalid = true; 3381 } 3382 3383 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3384}; 3385 3386struct CheckAbstractUsage { 3387 AbstractUsageInfo &Info; 3388 const NamedDecl *Ctx; 3389 3390 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3391 : Info(Info), Ctx(Ctx) {} 3392 3393 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3394 switch (TL.getTypeLocClass()) { 3395#define ABSTRACT_TYPELOC(CLASS, PARENT) 3396#define TYPELOC(CLASS, PARENT) \ 3397 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3398#include "clang/AST/TypeLocNodes.def" 3399 } 3400 } 3401 3402 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3403 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3404 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3405 if (!TL.getArg(I)) 3406 continue; 3407 3408 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3409 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3410 } 3411 } 3412 3413 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3414 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3415 } 3416 3417 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3418 // Visit the type parameters from a permissive context. 3419 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3420 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3421 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3422 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3423 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3424 // TODO: other template argument types? 3425 } 3426 } 3427 3428 // Visit pointee types from a permissive context. 3429#define CheckPolymorphic(Type) \ 3430 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3431 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3432 } 3433 CheckPolymorphic(PointerTypeLoc) 3434 CheckPolymorphic(ReferenceTypeLoc) 3435 CheckPolymorphic(MemberPointerTypeLoc) 3436 CheckPolymorphic(BlockPointerTypeLoc) 3437 CheckPolymorphic(AtomicTypeLoc) 3438 3439 /// Handle all the types we haven't given a more specific 3440 /// implementation for above. 3441 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3442 // Every other kind of type that we haven't called out already 3443 // that has an inner type is either (1) sugar or (2) contains that 3444 // inner type in some way as a subobject. 3445 if (TypeLoc Next = TL.getNextTypeLoc()) 3446 return Visit(Next, Sel); 3447 3448 // If there's no inner type and we're in a permissive context, 3449 // don't diagnose. 3450 if (Sel == Sema::AbstractNone) return; 3451 3452 // Check whether the type matches the abstract type. 3453 QualType T = TL.getType(); 3454 if (T->isArrayType()) { 3455 Sel = Sema::AbstractArrayType; 3456 T = Info.S.Context.getBaseElementType(T); 3457 } 3458 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3459 if (CT != Info.AbstractType) return; 3460 3461 // It matched; do some magic. 3462 if (Sel == Sema::AbstractArrayType) { 3463 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3464 << T << TL.getSourceRange(); 3465 } else { 3466 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3467 << Sel << T << TL.getSourceRange(); 3468 } 3469 Info.DiagnoseAbstractType(); 3470 } 3471}; 3472 3473void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3474 Sema::AbstractDiagSelID Sel) { 3475 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3476} 3477 3478} 3479 3480/// Check for invalid uses of an abstract type in a method declaration. 3481static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3482 CXXMethodDecl *MD) { 3483 // No need to do the check on definitions, which require that 3484 // the return/param types be complete. 3485 if (MD->doesThisDeclarationHaveABody()) 3486 return; 3487 3488 // For safety's sake, just ignore it if we don't have type source 3489 // information. This should never happen for non-implicit methods, 3490 // but... 3491 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3492 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3493} 3494 3495/// Check for invalid uses of an abstract type within a class definition. 3496static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3497 CXXRecordDecl *RD) { 3498 for (CXXRecordDecl::decl_iterator 3499 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3500 Decl *D = *I; 3501 if (D->isImplicit()) continue; 3502 3503 // Methods and method templates. 3504 if (isa<CXXMethodDecl>(D)) { 3505 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3506 } else if (isa<FunctionTemplateDecl>(D)) { 3507 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3508 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3509 3510 // Fields and static variables. 3511 } else if (isa<FieldDecl>(D)) { 3512 FieldDecl *FD = cast<FieldDecl>(D); 3513 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3514 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3515 } else if (isa<VarDecl>(D)) { 3516 VarDecl *VD = cast<VarDecl>(D); 3517 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3518 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3519 3520 // Nested classes and class templates. 3521 } else if (isa<CXXRecordDecl>(D)) { 3522 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3523 } else if (isa<ClassTemplateDecl>(D)) { 3524 CheckAbstractClassUsage(Info, 3525 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3526 } 3527 } 3528} 3529 3530/// \brief Perform semantic checks on a class definition that has been 3531/// completing, introducing implicitly-declared members, checking for 3532/// abstract types, etc. 3533void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3534 if (!Record) 3535 return; 3536 3537 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3538 AbstractUsageInfo Info(*this, Record); 3539 CheckAbstractClassUsage(Info, Record); 3540 } 3541 3542 // If this is not an aggregate type and has no user-declared constructor, 3543 // complain about any non-static data members of reference or const scalar 3544 // type, since they will never get initializers. 3545 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3546 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3547 bool Complained = false; 3548 for (RecordDecl::field_iterator F = Record->field_begin(), 3549 FEnd = Record->field_end(); 3550 F != FEnd; ++F) { 3551 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3552 continue; 3553 3554 if (F->getType()->isReferenceType() || 3555 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3556 if (!Complained) { 3557 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3558 << Record->getTagKind() << Record; 3559 Complained = true; 3560 } 3561 3562 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3563 << F->getType()->isReferenceType() 3564 << F->getDeclName(); 3565 } 3566 } 3567 } 3568 3569 if (Record->isDynamicClass() && !Record->isDependentType()) 3570 DynamicClasses.push_back(Record); 3571 3572 if (Record->getIdentifier()) { 3573 // C++ [class.mem]p13: 3574 // If T is the name of a class, then each of the following shall have a 3575 // name different from T: 3576 // - every member of every anonymous union that is a member of class T. 3577 // 3578 // C++ [class.mem]p14: 3579 // In addition, if class T has a user-declared constructor (12.1), every 3580 // non-static data member of class T shall have a name different from T. 3581 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3582 R.first != R.second; ++R.first) { 3583 NamedDecl *D = *R.first; 3584 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3585 isa<IndirectFieldDecl>(D)) { 3586 Diag(D->getLocation(), diag::err_member_name_of_class) 3587 << D->getDeclName(); 3588 break; 3589 } 3590 } 3591 } 3592 3593 // Warn if the class has virtual methods but non-virtual public destructor. 3594 if (Record->isPolymorphic() && !Record->isDependentType()) { 3595 CXXDestructorDecl *dtor = Record->getDestructor(); 3596 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3597 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3598 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3599 } 3600 3601 // See if a method overloads virtual methods in a base 3602 /// class without overriding any. 3603 if (!Record->isDependentType()) { 3604 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3605 MEnd = Record->method_end(); 3606 M != MEnd; ++M) { 3607 if (!(*M)->isStatic()) 3608 DiagnoseHiddenVirtualMethods(Record, *M); 3609 } 3610 } 3611 3612 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3613 // function that is not a constructor declares that member function to be 3614 // const. [...] The class of which that function is a member shall be 3615 // a literal type. 3616 // 3617 // It's fine to diagnose constructors here too: such constructors cannot 3618 // produce a constant expression, so are ill-formed (no diagnostic required). 3619 // 3620 // If the class has virtual bases, any constexpr members will already have 3621 // been diagnosed by the checks performed on the member declaration, so 3622 // suppress this (less useful) diagnostic. 3623 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3624 !Record->isLiteral() && !Record->getNumVBases()) { 3625 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3626 MEnd = Record->method_end(); 3627 M != MEnd; ++M) { 3628 if ((*M)->isConstexpr()) { 3629 switch (Record->getTemplateSpecializationKind()) { 3630 case TSK_ImplicitInstantiation: 3631 case TSK_ExplicitInstantiationDeclaration: 3632 case TSK_ExplicitInstantiationDefinition: 3633 // If a template instantiates to a non-literal type, but its members 3634 // instantiate to constexpr functions, the template is technically 3635 // ill-formed, but we allow it for sanity. Such members are treated as 3636 // non-constexpr. 3637 (*M)->setConstexpr(false); 3638 continue; 3639 3640 case TSK_Undeclared: 3641 case TSK_ExplicitSpecialization: 3642 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3643 PDiag(diag::err_constexpr_method_non_literal)); 3644 break; 3645 } 3646 3647 // Only produce one error per class. 3648 break; 3649 } 3650 } 3651 } 3652 3653 // Declare inherited constructors. We do this eagerly here because: 3654 // - The standard requires an eager diagnostic for conflicting inherited 3655 // constructors from different classes. 3656 // - The lazy declaration of the other implicit constructors is so as to not 3657 // waste space and performance on classes that are not meant to be 3658 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3659 // have inherited constructors. 3660 DeclareInheritedConstructors(Record); 3661 3662 if (!Record->isDependentType()) 3663 CheckExplicitlyDefaultedMethods(Record); 3664} 3665 3666void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3667 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3668 ME = Record->method_end(); 3669 MI != ME; ++MI) { 3670 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3671 switch (getSpecialMember(*MI)) { 3672 case CXXDefaultConstructor: 3673 CheckExplicitlyDefaultedDefaultConstructor( 3674 cast<CXXConstructorDecl>(*MI)); 3675 break; 3676 3677 case CXXDestructor: 3678 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3679 break; 3680 3681 case CXXCopyConstructor: 3682 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3683 break; 3684 3685 case CXXCopyAssignment: 3686 CheckExplicitlyDefaultedCopyAssignment(*MI); 3687 break; 3688 3689 case CXXMoveConstructor: 3690 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3691 break; 3692 3693 case CXXMoveAssignment: 3694 CheckExplicitlyDefaultedMoveAssignment(*MI); 3695 break; 3696 3697 case CXXInvalid: 3698 llvm_unreachable("non-special member explicitly defaulted!"); 3699 } 3700 } 3701 } 3702 3703} 3704 3705void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3706 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3707 3708 // Whether this was the first-declared instance of the constructor. 3709 // This affects whether we implicitly add an exception spec (and, eventually, 3710 // constexpr). It is also ill-formed to explicitly default a constructor such 3711 // that it would be deleted. (C++0x [decl.fct.def.default]) 3712 bool First = CD == CD->getCanonicalDecl(); 3713 3714 bool HadError = false; 3715 if (CD->getNumParams() != 0) { 3716 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3717 << CD->getSourceRange(); 3718 HadError = true; 3719 } 3720 3721 ImplicitExceptionSpecification Spec 3722 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3723 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3724 if (EPI.ExceptionSpecType == EST_Delayed) { 3725 // Exception specification depends on some deferred part of the class. We'll 3726 // try again when the class's definition has been fully processed. 3727 return; 3728 } 3729 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3730 *ExceptionType = Context.getFunctionType( 3731 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3732 3733 if (CtorType->hasExceptionSpec()) { 3734 if (CheckEquivalentExceptionSpec( 3735 PDiag(diag::err_incorrect_defaulted_exception_spec) 3736 << CXXDefaultConstructor, 3737 PDiag(), 3738 ExceptionType, SourceLocation(), 3739 CtorType, CD->getLocation())) { 3740 HadError = true; 3741 } 3742 } else if (First) { 3743 // We set the declaration to have the computed exception spec here. 3744 // We know there are no parameters. 3745 EPI.ExtInfo = CtorType->getExtInfo(); 3746 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3747 } 3748 3749 if (HadError) { 3750 CD->setInvalidDecl(); 3751 return; 3752 } 3753 3754 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3755 if (First) { 3756 CD->setDeletedAsWritten(); 3757 } else { 3758 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3759 << CXXDefaultConstructor; 3760 CD->setInvalidDecl(); 3761 } 3762 } 3763} 3764 3765void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3766 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3767 3768 // Whether this was the first-declared instance of the constructor. 3769 bool First = CD == CD->getCanonicalDecl(); 3770 3771 bool HadError = false; 3772 if (CD->getNumParams() != 1) { 3773 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3774 << CD->getSourceRange(); 3775 HadError = true; 3776 } 3777 3778 ImplicitExceptionSpecification Spec(Context); 3779 bool Const; 3780 llvm::tie(Spec, Const) = 3781 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3782 3783 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3784 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3785 *ExceptionType = Context.getFunctionType( 3786 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3787 3788 // Check for parameter type matching. 3789 // This is a copy ctor so we know it's a cv-qualified reference to T. 3790 QualType ArgType = CtorType->getArgType(0); 3791 if (ArgType->getPointeeType().isVolatileQualified()) { 3792 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3793 HadError = true; 3794 } 3795 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3796 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3797 HadError = true; 3798 } 3799 3800 if (CtorType->hasExceptionSpec()) { 3801 if (CheckEquivalentExceptionSpec( 3802 PDiag(diag::err_incorrect_defaulted_exception_spec) 3803 << CXXCopyConstructor, 3804 PDiag(), 3805 ExceptionType, SourceLocation(), 3806 CtorType, CD->getLocation())) { 3807 HadError = true; 3808 } 3809 } else if (First) { 3810 // We set the declaration to have the computed exception spec here. 3811 // We duplicate the one parameter type. 3812 EPI.ExtInfo = CtorType->getExtInfo(); 3813 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3814 } 3815 3816 if (HadError) { 3817 CD->setInvalidDecl(); 3818 return; 3819 } 3820 3821 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3822 if (First) { 3823 CD->setDeletedAsWritten(); 3824 } else { 3825 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3826 << CXXCopyConstructor; 3827 CD->setInvalidDecl(); 3828 } 3829 } 3830} 3831 3832void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3833 assert(MD->isExplicitlyDefaulted()); 3834 3835 // Whether this was the first-declared instance of the operator 3836 bool First = MD == MD->getCanonicalDecl(); 3837 3838 bool HadError = false; 3839 if (MD->getNumParams() != 1) { 3840 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3841 << MD->getSourceRange(); 3842 HadError = true; 3843 } 3844 3845 QualType ReturnType = 3846 MD->getType()->getAs<FunctionType>()->getResultType(); 3847 if (!ReturnType->isLValueReferenceType() || 3848 !Context.hasSameType( 3849 Context.getCanonicalType(ReturnType->getPointeeType()), 3850 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3851 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3852 HadError = true; 3853 } 3854 3855 ImplicitExceptionSpecification Spec(Context); 3856 bool Const; 3857 llvm::tie(Spec, Const) = 3858 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3859 3860 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3861 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3862 *ExceptionType = Context.getFunctionType( 3863 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3864 3865 QualType ArgType = OperType->getArgType(0); 3866 if (!ArgType->isLValueReferenceType()) { 3867 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3868 HadError = true; 3869 } else { 3870 if (ArgType->getPointeeType().isVolatileQualified()) { 3871 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3872 HadError = true; 3873 } 3874 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3875 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3876 HadError = true; 3877 } 3878 } 3879 3880 if (OperType->getTypeQuals()) { 3881 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3882 HadError = true; 3883 } 3884 3885 if (OperType->hasExceptionSpec()) { 3886 if (CheckEquivalentExceptionSpec( 3887 PDiag(diag::err_incorrect_defaulted_exception_spec) 3888 << CXXCopyAssignment, 3889 PDiag(), 3890 ExceptionType, SourceLocation(), 3891 OperType, MD->getLocation())) { 3892 HadError = true; 3893 } 3894 } else if (First) { 3895 // We set the declaration to have the computed exception spec here. 3896 // We duplicate the one parameter type. 3897 EPI.RefQualifier = OperType->getRefQualifier(); 3898 EPI.ExtInfo = OperType->getExtInfo(); 3899 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3900 } 3901 3902 if (HadError) { 3903 MD->setInvalidDecl(); 3904 return; 3905 } 3906 3907 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3908 if (First) { 3909 MD->setDeletedAsWritten(); 3910 } else { 3911 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3912 << CXXCopyAssignment; 3913 MD->setInvalidDecl(); 3914 } 3915 } 3916} 3917 3918void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3919 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3920 3921 // Whether this was the first-declared instance of the constructor. 3922 bool First = CD == CD->getCanonicalDecl(); 3923 3924 bool HadError = false; 3925 if (CD->getNumParams() != 1) { 3926 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3927 << CD->getSourceRange(); 3928 HadError = true; 3929 } 3930 3931 ImplicitExceptionSpecification Spec( 3932 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3933 3934 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3935 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3936 *ExceptionType = Context.getFunctionType( 3937 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3938 3939 // Check for parameter type matching. 3940 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3941 QualType ArgType = CtorType->getArgType(0); 3942 if (ArgType->getPointeeType().isVolatileQualified()) { 3943 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3944 HadError = true; 3945 } 3946 if (ArgType->getPointeeType().isConstQualified()) { 3947 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3948 HadError = true; 3949 } 3950 3951 if (CtorType->hasExceptionSpec()) { 3952 if (CheckEquivalentExceptionSpec( 3953 PDiag(diag::err_incorrect_defaulted_exception_spec) 3954 << CXXMoveConstructor, 3955 PDiag(), 3956 ExceptionType, SourceLocation(), 3957 CtorType, CD->getLocation())) { 3958 HadError = true; 3959 } 3960 } else if (First) { 3961 // We set the declaration to have the computed exception spec here. 3962 // We duplicate the one parameter type. 3963 EPI.ExtInfo = CtorType->getExtInfo(); 3964 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3965 } 3966 3967 if (HadError) { 3968 CD->setInvalidDecl(); 3969 return; 3970 } 3971 3972 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3973 if (First) { 3974 CD->setDeletedAsWritten(); 3975 } else { 3976 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3977 << CXXMoveConstructor; 3978 CD->setInvalidDecl(); 3979 } 3980 } 3981} 3982 3983void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3984 assert(MD->isExplicitlyDefaulted()); 3985 3986 // Whether this was the first-declared instance of the operator 3987 bool First = MD == MD->getCanonicalDecl(); 3988 3989 bool HadError = false; 3990 if (MD->getNumParams() != 1) { 3991 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3992 << MD->getSourceRange(); 3993 HadError = true; 3994 } 3995 3996 QualType ReturnType = 3997 MD->getType()->getAs<FunctionType>()->getResultType(); 3998 if (!ReturnType->isLValueReferenceType() || 3999 !Context.hasSameType( 4000 Context.getCanonicalType(ReturnType->getPointeeType()), 4001 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4002 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4003 HadError = true; 4004 } 4005 4006 ImplicitExceptionSpecification Spec( 4007 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4008 4009 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4010 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4011 *ExceptionType = Context.getFunctionType( 4012 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4013 4014 QualType ArgType = OperType->getArgType(0); 4015 if (!ArgType->isRValueReferenceType()) { 4016 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4017 HadError = true; 4018 } else { 4019 if (ArgType->getPointeeType().isVolatileQualified()) { 4020 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4021 HadError = true; 4022 } 4023 if (ArgType->getPointeeType().isConstQualified()) { 4024 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4025 HadError = true; 4026 } 4027 } 4028 4029 if (OperType->getTypeQuals()) { 4030 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4031 HadError = true; 4032 } 4033 4034 if (OperType->hasExceptionSpec()) { 4035 if (CheckEquivalentExceptionSpec( 4036 PDiag(diag::err_incorrect_defaulted_exception_spec) 4037 << CXXMoveAssignment, 4038 PDiag(), 4039 ExceptionType, SourceLocation(), 4040 OperType, MD->getLocation())) { 4041 HadError = true; 4042 } 4043 } else if (First) { 4044 // We set the declaration to have the computed exception spec here. 4045 // We duplicate the one parameter type. 4046 EPI.RefQualifier = OperType->getRefQualifier(); 4047 EPI.ExtInfo = OperType->getExtInfo(); 4048 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4049 } 4050 4051 if (HadError) { 4052 MD->setInvalidDecl(); 4053 return; 4054 } 4055 4056 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4057 if (First) { 4058 MD->setDeletedAsWritten(); 4059 } else { 4060 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4061 << CXXMoveAssignment; 4062 MD->setInvalidDecl(); 4063 } 4064 } 4065} 4066 4067void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4068 assert(DD->isExplicitlyDefaulted()); 4069 4070 // Whether this was the first-declared instance of the destructor. 4071 bool First = DD == DD->getCanonicalDecl(); 4072 4073 ImplicitExceptionSpecification Spec 4074 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4075 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4076 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4077 *ExceptionType = Context.getFunctionType( 4078 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4079 4080 if (DtorType->hasExceptionSpec()) { 4081 if (CheckEquivalentExceptionSpec( 4082 PDiag(diag::err_incorrect_defaulted_exception_spec) 4083 << CXXDestructor, 4084 PDiag(), 4085 ExceptionType, SourceLocation(), 4086 DtorType, DD->getLocation())) { 4087 DD->setInvalidDecl(); 4088 return; 4089 } 4090 } else if (First) { 4091 // We set the declaration to have the computed exception spec here. 4092 // There are no parameters. 4093 EPI.ExtInfo = DtorType->getExtInfo(); 4094 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4095 } 4096 4097 if (ShouldDeleteDestructor(DD)) { 4098 if (First) { 4099 DD->setDeletedAsWritten(); 4100 } else { 4101 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4102 << CXXDestructor; 4103 DD->setInvalidDecl(); 4104 } 4105 } 4106} 4107 4108/// This function implements the following C++0x paragraphs: 4109/// - [class.ctor]/5 4110/// - [class.copy]/11 4111bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4112 assert(!MD->isInvalidDecl()); 4113 CXXRecordDecl *RD = MD->getParent(); 4114 assert(!RD->isDependentType() && "do deletion after instantiation"); 4115 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4116 return false; 4117 4118 bool IsUnion = RD->isUnion(); 4119 bool IsConstructor = false; 4120 bool IsAssignment = false; 4121 bool IsMove = false; 4122 4123 bool ConstArg = false; 4124 4125 switch (CSM) { 4126 case CXXDefaultConstructor: 4127 IsConstructor = true; 4128 break; 4129 case CXXCopyConstructor: 4130 IsConstructor = true; 4131 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4132 break; 4133 case CXXMoveConstructor: 4134 IsConstructor = true; 4135 IsMove = true; 4136 break; 4137 default: 4138 llvm_unreachable("function only currently implemented for default ctors"); 4139 } 4140 4141 SourceLocation Loc = MD->getLocation(); 4142 4143 // Do access control from the special member function 4144 ContextRAII MethodContext(*this, MD); 4145 4146 bool AllConst = true; 4147 4148 // We do this because we should never actually use an anonymous 4149 // union's constructor. 4150 if (IsUnion && RD->isAnonymousStructOrUnion()) 4151 return false; 4152 4153 // FIXME: We should put some diagnostic logic right into this function. 4154 4155 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4156 BE = RD->bases_end(); 4157 BI != BE; ++BI) { 4158 // We'll handle this one later 4159 if (BI->isVirtual()) 4160 continue; 4161 4162 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4163 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4164 4165 // Unless we have an assignment operator, the base's destructor must 4166 // be accessible and not deleted. 4167 if (!IsAssignment) { 4168 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4169 if (BaseDtor->isDeleted()) 4170 return true; 4171 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4172 AR_accessible) 4173 return true; 4174 } 4175 4176 // Finding the corresponding member in the base should lead to a 4177 // unique, accessible, non-deleted function. If we are doing 4178 // a destructor, we have already checked this case. 4179 if (CSM != CXXDestructor) { 4180 SpecialMemberOverloadResult *SMOR = 4181 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4182 false); 4183 if (!SMOR->hasSuccess()) 4184 return true; 4185 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4186 if (IsConstructor) { 4187 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4188 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4189 PDiag()) != AR_accessible) 4190 return true; 4191 4192 // For a move operation, the corresponding operation must actually 4193 // be a move operation (and not a copy selected by overload 4194 // resolution) unless we are working on a trivially copyable class. 4195 if (IsMove && !BaseCtor->isMoveConstructor() && 4196 !BaseDecl->isTriviallyCopyable()) 4197 return true; 4198 } 4199 } 4200 } 4201 4202 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4203 BE = RD->vbases_end(); 4204 BI != BE; ++BI) { 4205 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4206 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4207 4208 // Unless we have an assignment operator, the base's destructor must 4209 // be accessible and not deleted. 4210 if (!IsAssignment) { 4211 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4212 if (BaseDtor->isDeleted()) 4213 return true; 4214 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4215 AR_accessible) 4216 return true; 4217 } 4218 4219 // Finding the corresponding member in the base should lead to a 4220 // unique, accessible, non-deleted function. 4221 if (CSM != CXXDestructor) { 4222 SpecialMemberOverloadResult *SMOR = 4223 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4224 false); 4225 if (!SMOR->hasSuccess()) 4226 return true; 4227 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4228 if (IsConstructor) { 4229 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4230 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4231 PDiag()) != AR_accessible) 4232 return true; 4233 4234 // For a move operation, the corresponding operation must actually 4235 // be a move operation (and not a copy selected by overload 4236 // resolution) unless we are working on a trivially copyable class. 4237 if (IsMove && !BaseCtor->isMoveConstructor() && 4238 !BaseDecl->isTriviallyCopyable()) 4239 return true; 4240 } 4241 } 4242 } 4243 4244 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4245 FE = RD->field_end(); 4246 FI != FE; ++FI) { 4247 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4248 continue; 4249 4250 QualType FieldType = Context.getBaseElementType(FI->getType()); 4251 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4252 4253 // For a default constructor, all references must be initialized in-class 4254 // and, if a union, it must have a non-const member. 4255 if (CSM == CXXDefaultConstructor) { 4256 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4257 return true; 4258 4259 if (IsUnion && !FieldType.isConstQualified()) 4260 AllConst = false; 4261 // For a copy constructor, data members must not be of rvalue reference 4262 // type. 4263 } else if (CSM == CXXCopyConstructor) { 4264 if (FieldType->isRValueReferenceType()) 4265 return true; 4266 } 4267 4268 if (FieldRecord) { 4269 // For a default constructor, a const member must have a user-provided 4270 // default constructor or else be explicitly initialized. 4271 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4272 !FI->hasInClassInitializer() && 4273 !FieldRecord->hasUserProvidedDefaultConstructor()) 4274 return true; 4275 4276 // Some additional restrictions exist on the variant members. 4277 if (!IsUnion && FieldRecord->isUnion() && 4278 FieldRecord->isAnonymousStructOrUnion()) { 4279 // We're okay to reuse AllConst here since we only care about the 4280 // value otherwise if we're in a union. 4281 AllConst = true; 4282 4283 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4284 UE = FieldRecord->field_end(); 4285 UI != UE; ++UI) { 4286 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4287 CXXRecordDecl *UnionFieldRecord = 4288 UnionFieldType->getAsCXXRecordDecl(); 4289 4290 if (!UnionFieldType.isConstQualified()) 4291 AllConst = false; 4292 4293 if (UnionFieldRecord) { 4294 // FIXME: Checking for accessibility and validity of this 4295 // destructor is technically going beyond the 4296 // standard, but this is believed to be a defect. 4297 if (!IsAssignment) { 4298 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4299 if (FieldDtor->isDeleted()) 4300 return true; 4301 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4302 AR_accessible) 4303 return true; 4304 if (!FieldDtor->isTrivial()) 4305 return true; 4306 } 4307 4308 if (CSM != CXXDestructor) { 4309 SpecialMemberOverloadResult *SMOR = 4310 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4311 false, false, false); 4312 // FIXME: Checking for accessibility and validity of this 4313 // corresponding member is technically going beyond the 4314 // standard, but this is believed to be a defect. 4315 if (!SMOR->hasSuccess()) 4316 return true; 4317 4318 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4319 // A member of a union must have a trivial corresponding 4320 // constructor. 4321 if (!FieldMember->isTrivial()) 4322 return true; 4323 4324 if (IsConstructor) { 4325 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4326 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4327 PDiag()) != AR_accessible) 4328 return true; 4329 } 4330 } 4331 } 4332 } 4333 4334 // At least one member in each anonymous union must be non-const 4335 if (CSM == CXXDefaultConstructor && AllConst) 4336 return true; 4337 4338 // Don't try to initialize the anonymous union 4339 // This is technically non-conformant, but sanity demands it. 4340 continue; 4341 } 4342 4343 // Unless we're doing assignment, the field's destructor must be 4344 // accessible and not deleted. 4345 if (!IsAssignment) { 4346 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4347 if (FieldDtor->isDeleted()) 4348 return true; 4349 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4350 AR_accessible) 4351 return true; 4352 } 4353 4354 // Check that the corresponding member of the field is accessible, 4355 // unique, and non-deleted. We don't do this if it has an explicit 4356 // initialization when default-constructing. 4357 if (CSM != CXXDestructor && 4358 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4359 SpecialMemberOverloadResult *SMOR = 4360 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4361 false); 4362 if (!SMOR->hasSuccess()) 4363 return true; 4364 4365 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4366 if (IsConstructor) { 4367 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4368 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4369 PDiag()) != AR_accessible) 4370 return true; 4371 4372 // For a move operation, the corresponding operation must actually 4373 // be a move operation (and not a copy selected by overload 4374 // resolution) unless we are working on a trivially copyable class. 4375 if (IsMove && !FieldCtor->isMoveConstructor() && 4376 !FieldRecord->isTriviallyCopyable()) 4377 return true; 4378 } 4379 4380 // We need the corresponding member of a union to be trivial so that 4381 // we can safely copy them all simultaneously. 4382 // FIXME: Note that performing the check here (where we rely on the lack 4383 // of an in-class initializer) is technically ill-formed. However, this 4384 // seems most obviously to be a bug in the standard. 4385 if (IsUnion && !FieldMember->isTrivial()) 4386 return true; 4387 } 4388 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4389 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4390 // We can't initialize a const member of non-class type to any value. 4391 return true; 4392 } 4393 } 4394 4395 // We can't have all const members in a union when default-constructing, 4396 // or else they're all nonsensical garbage values that can't be changed. 4397 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4398 return true; 4399 4400 return false; 4401} 4402 4403bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4404 CXXRecordDecl *RD = MD->getParent(); 4405 assert(!RD->isDependentType() && "do deletion after instantiation"); 4406 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4407 return false; 4408 4409 SourceLocation Loc = MD->getLocation(); 4410 4411 // Do access control from the constructor 4412 ContextRAII MethodContext(*this, MD); 4413 4414 bool Union = RD->isUnion(); 4415 4416 unsigned ArgQuals = 4417 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4418 Qualifiers::Const : 0; 4419 4420 // We do this because we should never actually use an anonymous 4421 // union's constructor. 4422 if (Union && RD->isAnonymousStructOrUnion()) 4423 return false; 4424 4425 // FIXME: We should put some diagnostic logic right into this function. 4426 4427 // C++0x [class.copy]/20 4428 // A defaulted [copy] assignment operator for class X is defined as deleted 4429 // if X has: 4430 4431 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4432 BE = RD->bases_end(); 4433 BI != BE; ++BI) { 4434 // We'll handle this one later 4435 if (BI->isVirtual()) 4436 continue; 4437 4438 QualType BaseType = BI->getType(); 4439 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4440 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4441 4442 // -- a [direct base class] B that cannot be [copied] because overload 4443 // resolution, as applied to B's [copy] assignment operator, results in 4444 // an ambiguity or a function that is deleted or inaccessible from the 4445 // assignment operator 4446 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4447 0); 4448 if (!CopyOper || CopyOper->isDeleted()) 4449 return true; 4450 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4451 return true; 4452 } 4453 4454 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4455 BE = RD->vbases_end(); 4456 BI != BE; ++BI) { 4457 QualType BaseType = BI->getType(); 4458 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4459 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4460 4461 // -- a [virtual base class] B that cannot be [copied] because overload 4462 // resolution, as applied to B's [copy] assignment operator, results in 4463 // an ambiguity or a function that is deleted or inaccessible from the 4464 // assignment operator 4465 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4466 0); 4467 if (!CopyOper || CopyOper->isDeleted()) 4468 return true; 4469 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4470 return true; 4471 } 4472 4473 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4474 FE = RD->field_end(); 4475 FI != FE; ++FI) { 4476 if (FI->isUnnamedBitfield()) 4477 continue; 4478 4479 QualType FieldType = Context.getBaseElementType(FI->getType()); 4480 4481 // -- a non-static data member of reference type 4482 if (FieldType->isReferenceType()) 4483 return true; 4484 4485 // -- a non-static data member of const non-class type (or array thereof) 4486 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4487 return true; 4488 4489 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4490 4491 if (FieldRecord) { 4492 // This is an anonymous union 4493 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4494 // Anonymous unions inside unions do not variant members create 4495 if (!Union) { 4496 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4497 UE = FieldRecord->field_end(); 4498 UI != UE; ++UI) { 4499 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4500 CXXRecordDecl *UnionFieldRecord = 4501 UnionFieldType->getAsCXXRecordDecl(); 4502 4503 // -- a variant member with a non-trivial [copy] assignment operator 4504 // and X is a union-like class 4505 if (UnionFieldRecord && 4506 !UnionFieldRecord->hasTrivialCopyAssignment()) 4507 return true; 4508 } 4509 } 4510 4511 // Don't try to initalize an anonymous union 4512 continue; 4513 // -- a variant member with a non-trivial [copy] assignment operator 4514 // and X is a union-like class 4515 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4516 return true; 4517 } 4518 4519 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4520 false, 0); 4521 if (!CopyOper || CopyOper->isDeleted()) 4522 return true; 4523 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4524 return true; 4525 } 4526 } 4527 4528 return false; 4529} 4530 4531bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4532 CXXRecordDecl *RD = MD->getParent(); 4533 assert(!RD->isDependentType() && "do deletion after instantiation"); 4534 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4535 return false; 4536 4537 SourceLocation Loc = MD->getLocation(); 4538 4539 // Do access control from the constructor 4540 ContextRAII MethodContext(*this, MD); 4541 4542 bool Union = RD->isUnion(); 4543 4544 // We do this because we should never actually use an anonymous 4545 // union's constructor. 4546 if (Union && RD->isAnonymousStructOrUnion()) 4547 return false; 4548 4549 // C++0x [class.copy]/20 4550 // A defaulted [move] assignment operator for class X is defined as deleted 4551 // if X has: 4552 4553 // -- for the move constructor, [...] any direct or indirect virtual base 4554 // class. 4555 if (RD->getNumVBases() != 0) 4556 return true; 4557 4558 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4559 BE = RD->bases_end(); 4560 BI != BE; ++BI) { 4561 4562 QualType BaseType = BI->getType(); 4563 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4564 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4565 4566 // -- a [direct base class] B that cannot be [moved] because overload 4567 // resolution, as applied to B's [move] assignment operator, results in 4568 // an ambiguity or a function that is deleted or inaccessible from the 4569 // assignment operator 4570 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4571 if (!MoveOper || MoveOper->isDeleted()) 4572 return true; 4573 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4574 return true; 4575 4576 // -- for the move assignment operator, a [direct base class] with a type 4577 // that does not have a move assignment operator and is not trivially 4578 // copyable. 4579 if (!MoveOper->isMoveAssignmentOperator() && 4580 !BaseDecl->isTriviallyCopyable()) 4581 return true; 4582 } 4583 4584 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4585 FE = RD->field_end(); 4586 FI != FE; ++FI) { 4587 if (FI->isUnnamedBitfield()) 4588 continue; 4589 4590 QualType FieldType = Context.getBaseElementType(FI->getType()); 4591 4592 // -- a non-static data member of reference type 4593 if (FieldType->isReferenceType()) 4594 return true; 4595 4596 // -- a non-static data member of const non-class type (or array thereof) 4597 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4598 return true; 4599 4600 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4601 4602 if (FieldRecord) { 4603 // This is an anonymous union 4604 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4605 // Anonymous unions inside unions do not variant members create 4606 if (!Union) { 4607 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4608 UE = FieldRecord->field_end(); 4609 UI != UE; ++UI) { 4610 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4611 CXXRecordDecl *UnionFieldRecord = 4612 UnionFieldType->getAsCXXRecordDecl(); 4613 4614 // -- a variant member with a non-trivial [move] assignment operator 4615 // and X is a union-like class 4616 if (UnionFieldRecord && 4617 !UnionFieldRecord->hasTrivialMoveAssignment()) 4618 return true; 4619 } 4620 } 4621 4622 // Don't try to initalize an anonymous union 4623 continue; 4624 // -- a variant member with a non-trivial [move] assignment operator 4625 // and X is a union-like class 4626 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4627 return true; 4628 } 4629 4630 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4631 if (!MoveOper || MoveOper->isDeleted()) 4632 return true; 4633 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4634 return true; 4635 4636 // -- for the move assignment operator, a [non-static data member] with a 4637 // type that does not have a move assignment operator and is not 4638 // trivially copyable. 4639 if (!MoveOper->isMoveAssignmentOperator() && 4640 !FieldRecord->isTriviallyCopyable()) 4641 return true; 4642 } 4643 } 4644 4645 return false; 4646} 4647 4648bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4649 CXXRecordDecl *RD = DD->getParent(); 4650 assert(!RD->isDependentType() && "do deletion after instantiation"); 4651 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4652 return false; 4653 4654 SourceLocation Loc = DD->getLocation(); 4655 4656 // Do access control from the destructor 4657 ContextRAII CtorContext(*this, DD); 4658 4659 bool Union = RD->isUnion(); 4660 4661 // We do this because we should never actually use an anonymous 4662 // union's destructor. 4663 if (Union && RD->isAnonymousStructOrUnion()) 4664 return false; 4665 4666 // C++0x [class.dtor]p5 4667 // A defaulted destructor for a class X is defined as deleted if: 4668 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4669 BE = RD->bases_end(); 4670 BI != BE; ++BI) { 4671 // We'll handle this one later 4672 if (BI->isVirtual()) 4673 continue; 4674 4675 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4676 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4677 assert(BaseDtor && "base has no destructor"); 4678 4679 // -- any direct or virtual base class has a deleted destructor or 4680 // a destructor that is inaccessible from the defaulted destructor 4681 if (BaseDtor->isDeleted()) 4682 return true; 4683 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4684 AR_accessible) 4685 return true; 4686 } 4687 4688 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4689 BE = RD->vbases_end(); 4690 BI != BE; ++BI) { 4691 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4692 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4693 assert(BaseDtor && "base has no destructor"); 4694 4695 // -- any direct or virtual base class has a deleted destructor or 4696 // a destructor that is inaccessible from the defaulted destructor 4697 if (BaseDtor->isDeleted()) 4698 return true; 4699 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4700 AR_accessible) 4701 return true; 4702 } 4703 4704 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4705 FE = RD->field_end(); 4706 FI != FE; ++FI) { 4707 QualType FieldType = Context.getBaseElementType(FI->getType()); 4708 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4709 if (FieldRecord) { 4710 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4711 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4712 UE = FieldRecord->field_end(); 4713 UI != UE; ++UI) { 4714 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4715 CXXRecordDecl *UnionFieldRecord = 4716 UnionFieldType->getAsCXXRecordDecl(); 4717 4718 // -- X is a union-like class that has a variant member with a non- 4719 // trivial destructor. 4720 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4721 return true; 4722 } 4723 // Technically we are supposed to do this next check unconditionally. 4724 // But that makes absolutely no sense. 4725 } else { 4726 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4727 4728 // -- any of the non-static data members has class type M (or array 4729 // thereof) and M has a deleted destructor or a destructor that is 4730 // inaccessible from the defaulted destructor 4731 if (FieldDtor->isDeleted()) 4732 return true; 4733 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4734 AR_accessible) 4735 return true; 4736 4737 // -- X is a union-like class that has a variant member with a non- 4738 // trivial destructor. 4739 if (Union && !FieldDtor->isTrivial()) 4740 return true; 4741 } 4742 } 4743 } 4744 4745 if (DD->isVirtual()) { 4746 FunctionDecl *OperatorDelete = 0; 4747 DeclarationName Name = 4748 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4749 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4750 false)) 4751 return true; 4752 } 4753 4754 4755 return false; 4756} 4757 4758/// \brief Data used with FindHiddenVirtualMethod 4759namespace { 4760 struct FindHiddenVirtualMethodData { 4761 Sema *S; 4762 CXXMethodDecl *Method; 4763 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4764 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4765 }; 4766} 4767 4768/// \brief Member lookup function that determines whether a given C++ 4769/// method overloads virtual methods in a base class without overriding any, 4770/// to be used with CXXRecordDecl::lookupInBases(). 4771static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4772 CXXBasePath &Path, 4773 void *UserData) { 4774 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4775 4776 FindHiddenVirtualMethodData &Data 4777 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4778 4779 DeclarationName Name = Data.Method->getDeclName(); 4780 assert(Name.getNameKind() == DeclarationName::Identifier); 4781 4782 bool foundSameNameMethod = false; 4783 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4784 for (Path.Decls = BaseRecord->lookup(Name); 4785 Path.Decls.first != Path.Decls.second; 4786 ++Path.Decls.first) { 4787 NamedDecl *D = *Path.Decls.first; 4788 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4789 MD = MD->getCanonicalDecl(); 4790 foundSameNameMethod = true; 4791 // Interested only in hidden virtual methods. 4792 if (!MD->isVirtual()) 4793 continue; 4794 // If the method we are checking overrides a method from its base 4795 // don't warn about the other overloaded methods. 4796 if (!Data.S->IsOverload(Data.Method, MD, false)) 4797 return true; 4798 // Collect the overload only if its hidden. 4799 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4800 overloadedMethods.push_back(MD); 4801 } 4802 } 4803 4804 if (foundSameNameMethod) 4805 Data.OverloadedMethods.append(overloadedMethods.begin(), 4806 overloadedMethods.end()); 4807 return foundSameNameMethod; 4808} 4809 4810/// \brief See if a method overloads virtual methods in a base class without 4811/// overriding any. 4812void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4813 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4814 MD->getLocation()) == DiagnosticsEngine::Ignored) 4815 return; 4816 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4817 return; 4818 4819 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4820 /*bool RecordPaths=*/false, 4821 /*bool DetectVirtual=*/false); 4822 FindHiddenVirtualMethodData Data; 4823 Data.Method = MD; 4824 Data.S = this; 4825 4826 // Keep the base methods that were overriden or introduced in the subclass 4827 // by 'using' in a set. A base method not in this set is hidden. 4828 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4829 res.first != res.second; ++res.first) { 4830 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4831 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4832 E = MD->end_overridden_methods(); 4833 I != E; ++I) 4834 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4835 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4836 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4837 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4838 } 4839 4840 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4841 !Data.OverloadedMethods.empty()) { 4842 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4843 << MD << (Data.OverloadedMethods.size() > 1); 4844 4845 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4846 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4847 Diag(overloadedMD->getLocation(), 4848 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4849 } 4850 } 4851} 4852 4853void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4854 Decl *TagDecl, 4855 SourceLocation LBrac, 4856 SourceLocation RBrac, 4857 AttributeList *AttrList) { 4858 if (!TagDecl) 4859 return; 4860 4861 AdjustDeclIfTemplate(TagDecl); 4862 4863 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4864 // strict aliasing violation! 4865 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4866 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4867 4868 CheckCompletedCXXClass( 4869 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4870} 4871 4872/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4873/// special functions, such as the default constructor, copy 4874/// constructor, or destructor, to the given C++ class (C++ 4875/// [special]p1). This routine can only be executed just before the 4876/// definition of the class is complete. 4877void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4878 if (!ClassDecl->hasUserDeclaredConstructor()) 4879 ++ASTContext::NumImplicitDefaultConstructors; 4880 4881 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4882 ++ASTContext::NumImplicitCopyConstructors; 4883 4884 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4885 ++ASTContext::NumImplicitCopyAssignmentOperators; 4886 4887 // If we have a dynamic class, then the copy assignment operator may be 4888 // virtual, so we have to declare it immediately. This ensures that, e.g., 4889 // it shows up in the right place in the vtable and that we diagnose 4890 // problems with the implicit exception specification. 4891 if (ClassDecl->isDynamicClass()) 4892 DeclareImplicitCopyAssignment(ClassDecl); 4893 } 4894 4895 if (!ClassDecl->hasUserDeclaredDestructor()) { 4896 ++ASTContext::NumImplicitDestructors; 4897 4898 // If we have a dynamic class, then the destructor may be virtual, so we 4899 // have to declare the destructor immediately. This ensures that, e.g., it 4900 // shows up in the right place in the vtable and that we diagnose problems 4901 // with the implicit exception specification. 4902 if (ClassDecl->isDynamicClass()) 4903 DeclareImplicitDestructor(ClassDecl); 4904 } 4905} 4906 4907void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4908 if (!D) 4909 return; 4910 4911 int NumParamList = D->getNumTemplateParameterLists(); 4912 for (int i = 0; i < NumParamList; i++) { 4913 TemplateParameterList* Params = D->getTemplateParameterList(i); 4914 for (TemplateParameterList::iterator Param = Params->begin(), 4915 ParamEnd = Params->end(); 4916 Param != ParamEnd; ++Param) { 4917 NamedDecl *Named = cast<NamedDecl>(*Param); 4918 if (Named->getDeclName()) { 4919 S->AddDecl(Named); 4920 IdResolver.AddDecl(Named); 4921 } 4922 } 4923 } 4924} 4925 4926void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4927 if (!D) 4928 return; 4929 4930 TemplateParameterList *Params = 0; 4931 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4932 Params = Template->getTemplateParameters(); 4933 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4934 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4935 Params = PartialSpec->getTemplateParameters(); 4936 else 4937 return; 4938 4939 for (TemplateParameterList::iterator Param = Params->begin(), 4940 ParamEnd = Params->end(); 4941 Param != ParamEnd; ++Param) { 4942 NamedDecl *Named = cast<NamedDecl>(*Param); 4943 if (Named->getDeclName()) { 4944 S->AddDecl(Named); 4945 IdResolver.AddDecl(Named); 4946 } 4947 } 4948} 4949 4950void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4951 if (!RecordD) return; 4952 AdjustDeclIfTemplate(RecordD); 4953 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4954 PushDeclContext(S, Record); 4955} 4956 4957void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4958 if (!RecordD) return; 4959 PopDeclContext(); 4960} 4961 4962/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4963/// parsing a top-level (non-nested) C++ class, and we are now 4964/// parsing those parts of the given Method declaration that could 4965/// not be parsed earlier (C++ [class.mem]p2), such as default 4966/// arguments. This action should enter the scope of the given 4967/// Method declaration as if we had just parsed the qualified method 4968/// name. However, it should not bring the parameters into scope; 4969/// that will be performed by ActOnDelayedCXXMethodParameter. 4970void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4971} 4972 4973/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4974/// C++ method declaration. We're (re-)introducing the given 4975/// function parameter into scope for use in parsing later parts of 4976/// the method declaration. For example, we could see an 4977/// ActOnParamDefaultArgument event for this parameter. 4978void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4979 if (!ParamD) 4980 return; 4981 4982 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4983 4984 // If this parameter has an unparsed default argument, clear it out 4985 // to make way for the parsed default argument. 4986 if (Param->hasUnparsedDefaultArg()) 4987 Param->setDefaultArg(0); 4988 4989 S->AddDecl(Param); 4990 if (Param->getDeclName()) 4991 IdResolver.AddDecl(Param); 4992} 4993 4994/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4995/// processing the delayed method declaration for Method. The method 4996/// declaration is now considered finished. There may be a separate 4997/// ActOnStartOfFunctionDef action later (not necessarily 4998/// immediately!) for this method, if it was also defined inside the 4999/// class body. 5000void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5001 if (!MethodD) 5002 return; 5003 5004 AdjustDeclIfTemplate(MethodD); 5005 5006 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5007 5008 // Now that we have our default arguments, check the constructor 5009 // again. It could produce additional diagnostics or affect whether 5010 // the class has implicitly-declared destructors, among other 5011 // things. 5012 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5013 CheckConstructor(Constructor); 5014 5015 // Check the default arguments, which we may have added. 5016 if (!Method->isInvalidDecl()) 5017 CheckCXXDefaultArguments(Method); 5018} 5019 5020/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5021/// the well-formedness of the constructor declarator @p D with type @p 5022/// R. If there are any errors in the declarator, this routine will 5023/// emit diagnostics and set the invalid bit to true. In any case, the type 5024/// will be updated to reflect a well-formed type for the constructor and 5025/// returned. 5026QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5027 StorageClass &SC) { 5028 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5029 5030 // C++ [class.ctor]p3: 5031 // A constructor shall not be virtual (10.3) or static (9.4). A 5032 // constructor can be invoked for a const, volatile or const 5033 // volatile object. A constructor shall not be declared const, 5034 // volatile, or const volatile (9.3.2). 5035 if (isVirtual) { 5036 if (!D.isInvalidType()) 5037 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5038 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5039 << SourceRange(D.getIdentifierLoc()); 5040 D.setInvalidType(); 5041 } 5042 if (SC == SC_Static) { 5043 if (!D.isInvalidType()) 5044 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5045 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5046 << SourceRange(D.getIdentifierLoc()); 5047 D.setInvalidType(); 5048 SC = SC_None; 5049 } 5050 5051 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5052 if (FTI.TypeQuals != 0) { 5053 if (FTI.TypeQuals & Qualifiers::Const) 5054 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5055 << "const" << SourceRange(D.getIdentifierLoc()); 5056 if (FTI.TypeQuals & Qualifiers::Volatile) 5057 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5058 << "volatile" << SourceRange(D.getIdentifierLoc()); 5059 if (FTI.TypeQuals & Qualifiers::Restrict) 5060 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5061 << "restrict" << SourceRange(D.getIdentifierLoc()); 5062 D.setInvalidType(); 5063 } 5064 5065 // C++0x [class.ctor]p4: 5066 // A constructor shall not be declared with a ref-qualifier. 5067 if (FTI.hasRefQualifier()) { 5068 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5069 << FTI.RefQualifierIsLValueRef 5070 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5071 D.setInvalidType(); 5072 } 5073 5074 // Rebuild the function type "R" without any type qualifiers (in 5075 // case any of the errors above fired) and with "void" as the 5076 // return type, since constructors don't have return types. 5077 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5078 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5079 return R; 5080 5081 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5082 EPI.TypeQuals = 0; 5083 EPI.RefQualifier = RQ_None; 5084 5085 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5086 Proto->getNumArgs(), EPI); 5087} 5088 5089/// CheckConstructor - Checks a fully-formed constructor for 5090/// well-formedness, issuing any diagnostics required. Returns true if 5091/// the constructor declarator is invalid. 5092void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5093 CXXRecordDecl *ClassDecl 5094 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5095 if (!ClassDecl) 5096 return Constructor->setInvalidDecl(); 5097 5098 // C++ [class.copy]p3: 5099 // A declaration of a constructor for a class X is ill-formed if 5100 // its first parameter is of type (optionally cv-qualified) X and 5101 // either there are no other parameters or else all other 5102 // parameters have default arguments. 5103 if (!Constructor->isInvalidDecl() && 5104 ((Constructor->getNumParams() == 1) || 5105 (Constructor->getNumParams() > 1 && 5106 Constructor->getParamDecl(1)->hasDefaultArg())) && 5107 Constructor->getTemplateSpecializationKind() 5108 != TSK_ImplicitInstantiation) { 5109 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5110 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5111 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5112 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5113 const char *ConstRef 5114 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5115 : " const &"; 5116 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5117 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5118 5119 // FIXME: Rather that making the constructor invalid, we should endeavor 5120 // to fix the type. 5121 Constructor->setInvalidDecl(); 5122 } 5123 } 5124} 5125 5126/// CheckDestructor - Checks a fully-formed destructor definition for 5127/// well-formedness, issuing any diagnostics required. Returns true 5128/// on error. 5129bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5130 CXXRecordDecl *RD = Destructor->getParent(); 5131 5132 if (Destructor->isVirtual()) { 5133 SourceLocation Loc; 5134 5135 if (!Destructor->isImplicit()) 5136 Loc = Destructor->getLocation(); 5137 else 5138 Loc = RD->getLocation(); 5139 5140 // If we have a virtual destructor, look up the deallocation function 5141 FunctionDecl *OperatorDelete = 0; 5142 DeclarationName Name = 5143 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5144 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5145 return true; 5146 5147 MarkDeclarationReferenced(Loc, OperatorDelete); 5148 5149 Destructor->setOperatorDelete(OperatorDelete); 5150 } 5151 5152 return false; 5153} 5154 5155static inline bool 5156FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5157 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5158 FTI.ArgInfo[0].Param && 5159 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5160} 5161 5162/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5163/// the well-formednes of the destructor declarator @p D with type @p 5164/// R. If there are any errors in the declarator, this routine will 5165/// emit diagnostics and set the declarator to invalid. Even if this happens, 5166/// will be updated to reflect a well-formed type for the destructor and 5167/// returned. 5168QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5169 StorageClass& SC) { 5170 // C++ [class.dtor]p1: 5171 // [...] A typedef-name that names a class is a class-name 5172 // (7.1.3); however, a typedef-name that names a class shall not 5173 // be used as the identifier in the declarator for a destructor 5174 // declaration. 5175 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5176 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5177 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5178 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5179 else if (const TemplateSpecializationType *TST = 5180 DeclaratorType->getAs<TemplateSpecializationType>()) 5181 if (TST->isTypeAlias()) 5182 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5183 << DeclaratorType << 1; 5184 5185 // C++ [class.dtor]p2: 5186 // A destructor is used to destroy objects of its class type. A 5187 // destructor takes no parameters, and no return type can be 5188 // specified for it (not even void). The address of a destructor 5189 // shall not be taken. A destructor shall not be static. A 5190 // destructor can be invoked for a const, volatile or const 5191 // volatile object. A destructor shall not be declared const, 5192 // volatile or const volatile (9.3.2). 5193 if (SC == SC_Static) { 5194 if (!D.isInvalidType()) 5195 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5196 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5197 << SourceRange(D.getIdentifierLoc()) 5198 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5199 5200 SC = SC_None; 5201 } 5202 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5203 // Destructors don't have return types, but the parser will 5204 // happily parse something like: 5205 // 5206 // class X { 5207 // float ~X(); 5208 // }; 5209 // 5210 // The return type will be eliminated later. 5211 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5212 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5213 << SourceRange(D.getIdentifierLoc()); 5214 } 5215 5216 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5217 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5218 if (FTI.TypeQuals & Qualifiers::Const) 5219 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5220 << "const" << SourceRange(D.getIdentifierLoc()); 5221 if (FTI.TypeQuals & Qualifiers::Volatile) 5222 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5223 << "volatile" << SourceRange(D.getIdentifierLoc()); 5224 if (FTI.TypeQuals & Qualifiers::Restrict) 5225 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5226 << "restrict" << SourceRange(D.getIdentifierLoc()); 5227 D.setInvalidType(); 5228 } 5229 5230 // C++0x [class.dtor]p2: 5231 // A destructor shall not be declared with a ref-qualifier. 5232 if (FTI.hasRefQualifier()) { 5233 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5234 << FTI.RefQualifierIsLValueRef 5235 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5236 D.setInvalidType(); 5237 } 5238 5239 // Make sure we don't have any parameters. 5240 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5241 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5242 5243 // Delete the parameters. 5244 FTI.freeArgs(); 5245 D.setInvalidType(); 5246 } 5247 5248 // Make sure the destructor isn't variadic. 5249 if (FTI.isVariadic) { 5250 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5251 D.setInvalidType(); 5252 } 5253 5254 // Rebuild the function type "R" without any type qualifiers or 5255 // parameters (in case any of the errors above fired) and with 5256 // "void" as the return type, since destructors don't have return 5257 // types. 5258 if (!D.isInvalidType()) 5259 return R; 5260 5261 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5262 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5263 EPI.Variadic = false; 5264 EPI.TypeQuals = 0; 5265 EPI.RefQualifier = RQ_None; 5266 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5267} 5268 5269/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5270/// well-formednes of the conversion function declarator @p D with 5271/// type @p R. If there are any errors in the declarator, this routine 5272/// will emit diagnostics and return true. Otherwise, it will return 5273/// false. Either way, the type @p R will be updated to reflect a 5274/// well-formed type for the conversion operator. 5275void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5276 StorageClass& SC) { 5277 // C++ [class.conv.fct]p1: 5278 // Neither parameter types nor return type can be specified. The 5279 // type of a conversion function (8.3.5) is "function taking no 5280 // parameter returning conversion-type-id." 5281 if (SC == SC_Static) { 5282 if (!D.isInvalidType()) 5283 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5284 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5285 << SourceRange(D.getIdentifierLoc()); 5286 D.setInvalidType(); 5287 SC = SC_None; 5288 } 5289 5290 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5291 5292 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5293 // Conversion functions don't have return types, but the parser will 5294 // happily parse something like: 5295 // 5296 // class X { 5297 // float operator bool(); 5298 // }; 5299 // 5300 // The return type will be changed later anyway. 5301 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5302 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5303 << SourceRange(D.getIdentifierLoc()); 5304 D.setInvalidType(); 5305 } 5306 5307 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5308 5309 // Make sure we don't have any parameters. 5310 if (Proto->getNumArgs() > 0) { 5311 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5312 5313 // Delete the parameters. 5314 D.getFunctionTypeInfo().freeArgs(); 5315 D.setInvalidType(); 5316 } else if (Proto->isVariadic()) { 5317 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5318 D.setInvalidType(); 5319 } 5320 5321 // Diagnose "&operator bool()" and other such nonsense. This 5322 // is actually a gcc extension which we don't support. 5323 if (Proto->getResultType() != ConvType) { 5324 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5325 << Proto->getResultType(); 5326 D.setInvalidType(); 5327 ConvType = Proto->getResultType(); 5328 } 5329 5330 // C++ [class.conv.fct]p4: 5331 // The conversion-type-id shall not represent a function type nor 5332 // an array type. 5333 if (ConvType->isArrayType()) { 5334 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5335 ConvType = Context.getPointerType(ConvType); 5336 D.setInvalidType(); 5337 } else if (ConvType->isFunctionType()) { 5338 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5339 ConvType = Context.getPointerType(ConvType); 5340 D.setInvalidType(); 5341 } 5342 5343 // Rebuild the function type "R" without any parameters (in case any 5344 // of the errors above fired) and with the conversion type as the 5345 // return type. 5346 if (D.isInvalidType()) 5347 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5348 5349 // C++0x explicit conversion operators. 5350 if (D.getDeclSpec().isExplicitSpecified()) 5351 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5352 getLangOptions().CPlusPlus0x ? 5353 diag::warn_cxx98_compat_explicit_conversion_functions : 5354 diag::ext_explicit_conversion_functions) 5355 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5356} 5357 5358/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5359/// the declaration of the given C++ conversion function. This routine 5360/// is responsible for recording the conversion function in the C++ 5361/// class, if possible. 5362Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5363 assert(Conversion && "Expected to receive a conversion function declaration"); 5364 5365 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5366 5367 // Make sure we aren't redeclaring the conversion function. 5368 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5369 5370 // C++ [class.conv.fct]p1: 5371 // [...] A conversion function is never used to convert a 5372 // (possibly cv-qualified) object to the (possibly cv-qualified) 5373 // same object type (or a reference to it), to a (possibly 5374 // cv-qualified) base class of that type (or a reference to it), 5375 // or to (possibly cv-qualified) void. 5376 // FIXME: Suppress this warning if the conversion function ends up being a 5377 // virtual function that overrides a virtual function in a base class. 5378 QualType ClassType 5379 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5380 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5381 ConvType = ConvTypeRef->getPointeeType(); 5382 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5383 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5384 /* Suppress diagnostics for instantiations. */; 5385 else if (ConvType->isRecordType()) { 5386 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5387 if (ConvType == ClassType) 5388 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5389 << ClassType; 5390 else if (IsDerivedFrom(ClassType, ConvType)) 5391 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5392 << ClassType << ConvType; 5393 } else if (ConvType->isVoidType()) { 5394 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5395 << ClassType << ConvType; 5396 } 5397 5398 if (FunctionTemplateDecl *ConversionTemplate 5399 = Conversion->getDescribedFunctionTemplate()) 5400 return ConversionTemplate; 5401 5402 return Conversion; 5403} 5404 5405//===----------------------------------------------------------------------===// 5406// Namespace Handling 5407//===----------------------------------------------------------------------===// 5408 5409 5410 5411/// ActOnStartNamespaceDef - This is called at the start of a namespace 5412/// definition. 5413Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5414 SourceLocation InlineLoc, 5415 SourceLocation NamespaceLoc, 5416 SourceLocation IdentLoc, 5417 IdentifierInfo *II, 5418 SourceLocation LBrace, 5419 AttributeList *AttrList) { 5420 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5421 // For anonymous namespace, take the location of the left brace. 5422 SourceLocation Loc = II ? IdentLoc : LBrace; 5423 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5424 StartLoc, Loc, II); 5425 Namespc->setInline(InlineLoc.isValid()); 5426 5427 Scope *DeclRegionScope = NamespcScope->getParent(); 5428 5429 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5430 5431 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5432 PushNamespaceVisibilityAttr(Attr); 5433 5434 if (II) { 5435 // C++ [namespace.def]p2: 5436 // The identifier in an original-namespace-definition shall not 5437 // have been previously defined in the declarative region in 5438 // which the original-namespace-definition appears. The 5439 // identifier in an original-namespace-definition is the name of 5440 // the namespace. Subsequently in that declarative region, it is 5441 // treated as an original-namespace-name. 5442 // 5443 // Since namespace names are unique in their scope, and we don't 5444 // look through using directives, just look for any ordinary names. 5445 5446 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5447 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5448 Decl::IDNS_Namespace; 5449 NamedDecl *PrevDecl = 0; 5450 for (DeclContext::lookup_result R 5451 = CurContext->getRedeclContext()->lookup(II); 5452 R.first != R.second; ++R.first) { 5453 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5454 PrevDecl = *R.first; 5455 break; 5456 } 5457 } 5458 5459 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5460 // This is an extended namespace definition. 5461 if (Namespc->isInline() != OrigNS->isInline()) { 5462 // inline-ness must match 5463 if (OrigNS->isInline()) { 5464 // The user probably just forgot the 'inline', so suggest that it 5465 // be added back. 5466 Diag(Namespc->getLocation(), 5467 diag::warn_inline_namespace_reopened_noninline) 5468 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5469 } else { 5470 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5471 << Namespc->isInline(); 5472 } 5473 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5474 5475 // Recover by ignoring the new namespace's inline status. 5476 Namespc->setInline(OrigNS->isInline()); 5477 } 5478 5479 // Attach this namespace decl to the chain of extended namespace 5480 // definitions. 5481 OrigNS->setNextNamespace(Namespc); 5482 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5483 5484 // Remove the previous declaration from the scope. 5485 if (DeclRegionScope->isDeclScope(OrigNS)) { 5486 IdResolver.RemoveDecl(OrigNS); 5487 DeclRegionScope->RemoveDecl(OrigNS); 5488 } 5489 } else if (PrevDecl) { 5490 // This is an invalid name redefinition. 5491 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5492 << Namespc->getDeclName(); 5493 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5494 Namespc->setInvalidDecl(); 5495 // Continue on to push Namespc as current DeclContext and return it. 5496 } else if (II->isStr("std") && 5497 CurContext->getRedeclContext()->isTranslationUnit()) { 5498 // This is the first "real" definition of the namespace "std", so update 5499 // our cache of the "std" namespace to point at this definition. 5500 if (NamespaceDecl *StdNS = getStdNamespace()) { 5501 // We had already defined a dummy namespace "std". Link this new 5502 // namespace definition to the dummy namespace "std". 5503 StdNS->setNextNamespace(Namespc); 5504 StdNS->setLocation(IdentLoc); 5505 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5506 } 5507 5508 // Make our StdNamespace cache point at the first real definition of the 5509 // "std" namespace. 5510 StdNamespace = Namespc; 5511 5512 // Add this instance of "std" to the set of known namespaces 5513 KnownNamespaces[Namespc] = false; 5514 } else if (!Namespc->isInline()) { 5515 // Since this is an "original" namespace, add it to the known set of 5516 // namespaces if it is not an inline namespace. 5517 KnownNamespaces[Namespc] = false; 5518 } 5519 5520 PushOnScopeChains(Namespc, DeclRegionScope); 5521 } else { 5522 // Anonymous namespaces. 5523 assert(Namespc->isAnonymousNamespace()); 5524 5525 // Link the anonymous namespace into its parent. 5526 NamespaceDecl *PrevDecl; 5527 DeclContext *Parent = CurContext->getRedeclContext(); 5528 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5529 PrevDecl = TU->getAnonymousNamespace(); 5530 TU->setAnonymousNamespace(Namespc); 5531 } else { 5532 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5533 PrevDecl = ND->getAnonymousNamespace(); 5534 ND->setAnonymousNamespace(Namespc); 5535 } 5536 5537 // Link the anonymous namespace with its previous declaration. 5538 if (PrevDecl) { 5539 assert(PrevDecl->isAnonymousNamespace()); 5540 assert(!PrevDecl->getNextNamespace()); 5541 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5542 PrevDecl->setNextNamespace(Namespc); 5543 5544 if (Namespc->isInline() != PrevDecl->isInline()) { 5545 // inline-ness must match 5546 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5547 << Namespc->isInline(); 5548 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5549 Namespc->setInvalidDecl(); 5550 // Recover by ignoring the new namespace's inline status. 5551 Namespc->setInline(PrevDecl->isInline()); 5552 } 5553 } 5554 5555 CurContext->addDecl(Namespc); 5556 5557 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5558 // behaves as if it were replaced by 5559 // namespace unique { /* empty body */ } 5560 // using namespace unique; 5561 // namespace unique { namespace-body } 5562 // where all occurrences of 'unique' in a translation unit are 5563 // replaced by the same identifier and this identifier differs 5564 // from all other identifiers in the entire program. 5565 5566 // We just create the namespace with an empty name and then add an 5567 // implicit using declaration, just like the standard suggests. 5568 // 5569 // CodeGen enforces the "universally unique" aspect by giving all 5570 // declarations semantically contained within an anonymous 5571 // namespace internal linkage. 5572 5573 if (!PrevDecl) { 5574 UsingDirectiveDecl* UD 5575 = UsingDirectiveDecl::Create(Context, CurContext, 5576 /* 'using' */ LBrace, 5577 /* 'namespace' */ SourceLocation(), 5578 /* qualifier */ NestedNameSpecifierLoc(), 5579 /* identifier */ SourceLocation(), 5580 Namespc, 5581 /* Ancestor */ CurContext); 5582 UD->setImplicit(); 5583 CurContext->addDecl(UD); 5584 } 5585 } 5586 5587 // Although we could have an invalid decl (i.e. the namespace name is a 5588 // redefinition), push it as current DeclContext and try to continue parsing. 5589 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5590 // for the namespace has the declarations that showed up in that particular 5591 // namespace definition. 5592 PushDeclContext(NamespcScope, Namespc); 5593 return Namespc; 5594} 5595 5596/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5597/// is a namespace alias, returns the namespace it points to. 5598static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5599 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5600 return AD->getNamespace(); 5601 return dyn_cast_or_null<NamespaceDecl>(D); 5602} 5603 5604/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5605/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5606void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5607 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5608 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5609 Namespc->setRBraceLoc(RBrace); 5610 PopDeclContext(); 5611 if (Namespc->hasAttr<VisibilityAttr>()) 5612 PopPragmaVisibility(); 5613} 5614 5615CXXRecordDecl *Sema::getStdBadAlloc() const { 5616 return cast_or_null<CXXRecordDecl>( 5617 StdBadAlloc.get(Context.getExternalSource())); 5618} 5619 5620NamespaceDecl *Sema::getStdNamespace() const { 5621 return cast_or_null<NamespaceDecl>( 5622 StdNamespace.get(Context.getExternalSource())); 5623} 5624 5625/// \brief Retrieve the special "std" namespace, which may require us to 5626/// implicitly define the namespace. 5627NamespaceDecl *Sema::getOrCreateStdNamespace() { 5628 if (!StdNamespace) { 5629 // The "std" namespace has not yet been defined, so build one implicitly. 5630 StdNamespace = NamespaceDecl::Create(Context, 5631 Context.getTranslationUnitDecl(), 5632 SourceLocation(), SourceLocation(), 5633 &PP.getIdentifierTable().get("std")); 5634 getStdNamespace()->setImplicit(true); 5635 } 5636 5637 return getStdNamespace(); 5638} 5639 5640/// \brief Determine whether a using statement is in a context where it will be 5641/// apply in all contexts. 5642static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5643 switch (CurContext->getDeclKind()) { 5644 case Decl::TranslationUnit: 5645 return true; 5646 case Decl::LinkageSpec: 5647 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5648 default: 5649 return false; 5650 } 5651} 5652 5653static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5654 CXXScopeSpec &SS, 5655 SourceLocation IdentLoc, 5656 IdentifierInfo *Ident) { 5657 R.clear(); 5658 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5659 R.getLookupKind(), Sc, &SS, NULL, 5660 false, S.CTC_NoKeywords, NULL)) { 5661 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5662 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5663 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5664 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5665 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5666 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5667 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5668 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5669 else 5670 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5671 << Ident << CorrectedQuotedStr 5672 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5673 5674 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5675 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5676 5677 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5678 R.addDecl(Corrected.getCorrectionDecl()); 5679 return true; 5680 } 5681 R.setLookupName(Ident); 5682 } 5683 return false; 5684} 5685 5686Decl *Sema::ActOnUsingDirective(Scope *S, 5687 SourceLocation UsingLoc, 5688 SourceLocation NamespcLoc, 5689 CXXScopeSpec &SS, 5690 SourceLocation IdentLoc, 5691 IdentifierInfo *NamespcName, 5692 AttributeList *AttrList) { 5693 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5694 assert(NamespcName && "Invalid NamespcName."); 5695 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5696 5697 // This can only happen along a recovery path. 5698 while (S->getFlags() & Scope::TemplateParamScope) 5699 S = S->getParent(); 5700 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5701 5702 UsingDirectiveDecl *UDir = 0; 5703 NestedNameSpecifier *Qualifier = 0; 5704 if (SS.isSet()) 5705 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5706 5707 // Lookup namespace name. 5708 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5709 LookupParsedName(R, S, &SS); 5710 if (R.isAmbiguous()) 5711 return 0; 5712 5713 if (R.empty()) { 5714 R.clear(); 5715 // Allow "using namespace std;" or "using namespace ::std;" even if 5716 // "std" hasn't been defined yet, for GCC compatibility. 5717 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5718 NamespcName->isStr("std")) { 5719 Diag(IdentLoc, diag::ext_using_undefined_std); 5720 R.addDecl(getOrCreateStdNamespace()); 5721 R.resolveKind(); 5722 } 5723 // Otherwise, attempt typo correction. 5724 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5725 } 5726 5727 if (!R.empty()) { 5728 NamedDecl *Named = R.getFoundDecl(); 5729 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5730 && "expected namespace decl"); 5731 // C++ [namespace.udir]p1: 5732 // A using-directive specifies that the names in the nominated 5733 // namespace can be used in the scope in which the 5734 // using-directive appears after the using-directive. During 5735 // unqualified name lookup (3.4.1), the names appear as if they 5736 // were declared in the nearest enclosing namespace which 5737 // contains both the using-directive and the nominated 5738 // namespace. [Note: in this context, "contains" means "contains 5739 // directly or indirectly". ] 5740 5741 // Find enclosing context containing both using-directive and 5742 // nominated namespace. 5743 NamespaceDecl *NS = getNamespaceDecl(Named); 5744 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5745 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5746 CommonAncestor = CommonAncestor->getParent(); 5747 5748 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5749 SS.getWithLocInContext(Context), 5750 IdentLoc, Named, CommonAncestor); 5751 5752 if (IsUsingDirectiveInToplevelContext(CurContext) && 5753 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5754 Diag(IdentLoc, diag::warn_using_directive_in_header); 5755 } 5756 5757 PushUsingDirective(S, UDir); 5758 } else { 5759 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5760 } 5761 5762 // FIXME: We ignore attributes for now. 5763 return UDir; 5764} 5765 5766void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5767 // If scope has associated entity, then using directive is at namespace 5768 // or translation unit scope. We add UsingDirectiveDecls, into 5769 // it's lookup structure. 5770 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5771 Ctx->addDecl(UDir); 5772 else 5773 // Otherwise it is block-sope. using-directives will affect lookup 5774 // only to the end of scope. 5775 S->PushUsingDirective(UDir); 5776} 5777 5778 5779Decl *Sema::ActOnUsingDeclaration(Scope *S, 5780 AccessSpecifier AS, 5781 bool HasUsingKeyword, 5782 SourceLocation UsingLoc, 5783 CXXScopeSpec &SS, 5784 UnqualifiedId &Name, 5785 AttributeList *AttrList, 5786 bool IsTypeName, 5787 SourceLocation TypenameLoc) { 5788 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5789 5790 switch (Name.getKind()) { 5791 case UnqualifiedId::IK_ImplicitSelfParam: 5792 case UnqualifiedId::IK_Identifier: 5793 case UnqualifiedId::IK_OperatorFunctionId: 5794 case UnqualifiedId::IK_LiteralOperatorId: 5795 case UnqualifiedId::IK_ConversionFunctionId: 5796 break; 5797 5798 case UnqualifiedId::IK_ConstructorName: 5799 case UnqualifiedId::IK_ConstructorTemplateId: 5800 // C++0x inherited constructors. 5801 Diag(Name.getSourceRange().getBegin(), 5802 getLangOptions().CPlusPlus0x ? 5803 diag::warn_cxx98_compat_using_decl_constructor : 5804 diag::err_using_decl_constructor) 5805 << SS.getRange(); 5806 5807 if (getLangOptions().CPlusPlus0x) break; 5808 5809 return 0; 5810 5811 case UnqualifiedId::IK_DestructorName: 5812 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5813 << SS.getRange(); 5814 return 0; 5815 5816 case UnqualifiedId::IK_TemplateId: 5817 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5818 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5819 return 0; 5820 } 5821 5822 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5823 DeclarationName TargetName = TargetNameInfo.getName(); 5824 if (!TargetName) 5825 return 0; 5826 5827 // Warn about using declarations. 5828 // TODO: store that the declaration was written without 'using' and 5829 // talk about access decls instead of using decls in the 5830 // diagnostics. 5831 if (!HasUsingKeyword) { 5832 UsingLoc = Name.getSourceRange().getBegin(); 5833 5834 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5835 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5836 } 5837 5838 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5839 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5840 return 0; 5841 5842 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5843 TargetNameInfo, AttrList, 5844 /* IsInstantiation */ false, 5845 IsTypeName, TypenameLoc); 5846 if (UD) 5847 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5848 5849 return UD; 5850} 5851 5852/// \brief Determine whether a using declaration considers the given 5853/// declarations as "equivalent", e.g., if they are redeclarations of 5854/// the same entity or are both typedefs of the same type. 5855static bool 5856IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5857 bool &SuppressRedeclaration) { 5858 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5859 SuppressRedeclaration = false; 5860 return true; 5861 } 5862 5863 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5864 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5865 SuppressRedeclaration = true; 5866 return Context.hasSameType(TD1->getUnderlyingType(), 5867 TD2->getUnderlyingType()); 5868 } 5869 5870 return false; 5871} 5872 5873 5874/// Determines whether to create a using shadow decl for a particular 5875/// decl, given the set of decls existing prior to this using lookup. 5876bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5877 const LookupResult &Previous) { 5878 // Diagnose finding a decl which is not from a base class of the 5879 // current class. We do this now because there are cases where this 5880 // function will silently decide not to build a shadow decl, which 5881 // will pre-empt further diagnostics. 5882 // 5883 // We don't need to do this in C++0x because we do the check once on 5884 // the qualifier. 5885 // 5886 // FIXME: diagnose the following if we care enough: 5887 // struct A { int foo; }; 5888 // struct B : A { using A::foo; }; 5889 // template <class T> struct C : A {}; 5890 // template <class T> struct D : C<T> { using B::foo; } // <--- 5891 // This is invalid (during instantiation) in C++03 because B::foo 5892 // resolves to the using decl in B, which is not a base class of D<T>. 5893 // We can't diagnose it immediately because C<T> is an unknown 5894 // specialization. The UsingShadowDecl in D<T> then points directly 5895 // to A::foo, which will look well-formed when we instantiate. 5896 // The right solution is to not collapse the shadow-decl chain. 5897 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5898 DeclContext *OrigDC = Orig->getDeclContext(); 5899 5900 // Handle enums and anonymous structs. 5901 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5902 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5903 while (OrigRec->isAnonymousStructOrUnion()) 5904 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5905 5906 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5907 if (OrigDC == CurContext) { 5908 Diag(Using->getLocation(), 5909 diag::err_using_decl_nested_name_specifier_is_current_class) 5910 << Using->getQualifierLoc().getSourceRange(); 5911 Diag(Orig->getLocation(), diag::note_using_decl_target); 5912 return true; 5913 } 5914 5915 Diag(Using->getQualifierLoc().getBeginLoc(), 5916 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5917 << Using->getQualifier() 5918 << cast<CXXRecordDecl>(CurContext) 5919 << Using->getQualifierLoc().getSourceRange(); 5920 Diag(Orig->getLocation(), diag::note_using_decl_target); 5921 return true; 5922 } 5923 } 5924 5925 if (Previous.empty()) return false; 5926 5927 NamedDecl *Target = Orig; 5928 if (isa<UsingShadowDecl>(Target)) 5929 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5930 5931 // If the target happens to be one of the previous declarations, we 5932 // don't have a conflict. 5933 // 5934 // FIXME: but we might be increasing its access, in which case we 5935 // should redeclare it. 5936 NamedDecl *NonTag = 0, *Tag = 0; 5937 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5938 I != E; ++I) { 5939 NamedDecl *D = (*I)->getUnderlyingDecl(); 5940 bool Result; 5941 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5942 return Result; 5943 5944 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5945 } 5946 5947 if (Target->isFunctionOrFunctionTemplate()) { 5948 FunctionDecl *FD; 5949 if (isa<FunctionTemplateDecl>(Target)) 5950 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5951 else 5952 FD = cast<FunctionDecl>(Target); 5953 5954 NamedDecl *OldDecl = 0; 5955 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5956 case Ovl_Overload: 5957 return false; 5958 5959 case Ovl_NonFunction: 5960 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5961 break; 5962 5963 // We found a decl with the exact signature. 5964 case Ovl_Match: 5965 // If we're in a record, we want to hide the target, so we 5966 // return true (without a diagnostic) to tell the caller not to 5967 // build a shadow decl. 5968 if (CurContext->isRecord()) 5969 return true; 5970 5971 // If we're not in a record, this is an error. 5972 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5973 break; 5974 } 5975 5976 Diag(Target->getLocation(), diag::note_using_decl_target); 5977 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5978 return true; 5979 } 5980 5981 // Target is not a function. 5982 5983 if (isa<TagDecl>(Target)) { 5984 // No conflict between a tag and a non-tag. 5985 if (!Tag) return false; 5986 5987 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5988 Diag(Target->getLocation(), diag::note_using_decl_target); 5989 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5990 return true; 5991 } 5992 5993 // No conflict between a tag and a non-tag. 5994 if (!NonTag) return false; 5995 5996 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5997 Diag(Target->getLocation(), diag::note_using_decl_target); 5998 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5999 return true; 6000} 6001 6002/// Builds a shadow declaration corresponding to a 'using' declaration. 6003UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6004 UsingDecl *UD, 6005 NamedDecl *Orig) { 6006 6007 // If we resolved to another shadow declaration, just coalesce them. 6008 NamedDecl *Target = Orig; 6009 if (isa<UsingShadowDecl>(Target)) { 6010 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6011 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6012 } 6013 6014 UsingShadowDecl *Shadow 6015 = UsingShadowDecl::Create(Context, CurContext, 6016 UD->getLocation(), UD, Target); 6017 UD->addShadowDecl(Shadow); 6018 6019 Shadow->setAccess(UD->getAccess()); 6020 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6021 Shadow->setInvalidDecl(); 6022 6023 if (S) 6024 PushOnScopeChains(Shadow, S); 6025 else 6026 CurContext->addDecl(Shadow); 6027 6028 6029 return Shadow; 6030} 6031 6032/// Hides a using shadow declaration. This is required by the current 6033/// using-decl implementation when a resolvable using declaration in a 6034/// class is followed by a declaration which would hide or override 6035/// one or more of the using decl's targets; for example: 6036/// 6037/// struct Base { void foo(int); }; 6038/// struct Derived : Base { 6039/// using Base::foo; 6040/// void foo(int); 6041/// }; 6042/// 6043/// The governing language is C++03 [namespace.udecl]p12: 6044/// 6045/// When a using-declaration brings names from a base class into a 6046/// derived class scope, member functions in the derived class 6047/// override and/or hide member functions with the same name and 6048/// parameter types in a base class (rather than conflicting). 6049/// 6050/// There are two ways to implement this: 6051/// (1) optimistically create shadow decls when they're not hidden 6052/// by existing declarations, or 6053/// (2) don't create any shadow decls (or at least don't make them 6054/// visible) until we've fully parsed/instantiated the class. 6055/// The problem with (1) is that we might have to retroactively remove 6056/// a shadow decl, which requires several O(n) operations because the 6057/// decl structures are (very reasonably) not designed for removal. 6058/// (2) avoids this but is very fiddly and phase-dependent. 6059void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6060 if (Shadow->getDeclName().getNameKind() == 6061 DeclarationName::CXXConversionFunctionName) 6062 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6063 6064 // Remove it from the DeclContext... 6065 Shadow->getDeclContext()->removeDecl(Shadow); 6066 6067 // ...and the scope, if applicable... 6068 if (S) { 6069 S->RemoveDecl(Shadow); 6070 IdResolver.RemoveDecl(Shadow); 6071 } 6072 6073 // ...and the using decl. 6074 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6075 6076 // TODO: complain somehow if Shadow was used. It shouldn't 6077 // be possible for this to happen, because...? 6078} 6079 6080/// Builds a using declaration. 6081/// 6082/// \param IsInstantiation - Whether this call arises from an 6083/// instantiation of an unresolved using declaration. We treat 6084/// the lookup differently for these declarations. 6085NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6086 SourceLocation UsingLoc, 6087 CXXScopeSpec &SS, 6088 const DeclarationNameInfo &NameInfo, 6089 AttributeList *AttrList, 6090 bool IsInstantiation, 6091 bool IsTypeName, 6092 SourceLocation TypenameLoc) { 6093 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6094 SourceLocation IdentLoc = NameInfo.getLoc(); 6095 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6096 6097 // FIXME: We ignore attributes for now. 6098 6099 if (SS.isEmpty()) { 6100 Diag(IdentLoc, diag::err_using_requires_qualname); 6101 return 0; 6102 } 6103 6104 // Do the redeclaration lookup in the current scope. 6105 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6106 ForRedeclaration); 6107 Previous.setHideTags(false); 6108 if (S) { 6109 LookupName(Previous, S); 6110 6111 // It is really dumb that we have to do this. 6112 LookupResult::Filter F = Previous.makeFilter(); 6113 while (F.hasNext()) { 6114 NamedDecl *D = F.next(); 6115 if (!isDeclInScope(D, CurContext, S)) 6116 F.erase(); 6117 } 6118 F.done(); 6119 } else { 6120 assert(IsInstantiation && "no scope in non-instantiation"); 6121 assert(CurContext->isRecord() && "scope not record in instantiation"); 6122 LookupQualifiedName(Previous, CurContext); 6123 } 6124 6125 // Check for invalid redeclarations. 6126 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6127 return 0; 6128 6129 // Check for bad qualifiers. 6130 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6131 return 0; 6132 6133 DeclContext *LookupContext = computeDeclContext(SS); 6134 NamedDecl *D; 6135 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6136 if (!LookupContext) { 6137 if (IsTypeName) { 6138 // FIXME: not all declaration name kinds are legal here 6139 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6140 UsingLoc, TypenameLoc, 6141 QualifierLoc, 6142 IdentLoc, NameInfo.getName()); 6143 } else { 6144 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6145 QualifierLoc, NameInfo); 6146 } 6147 } else { 6148 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6149 NameInfo, IsTypeName); 6150 } 6151 D->setAccess(AS); 6152 CurContext->addDecl(D); 6153 6154 if (!LookupContext) return D; 6155 UsingDecl *UD = cast<UsingDecl>(D); 6156 6157 if (RequireCompleteDeclContext(SS, LookupContext)) { 6158 UD->setInvalidDecl(); 6159 return UD; 6160 } 6161 6162 // Constructor inheriting using decls get special treatment. 6163 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6164 if (CheckInheritedConstructorUsingDecl(UD)) 6165 UD->setInvalidDecl(); 6166 return UD; 6167 } 6168 6169 // Otherwise, look up the target name. 6170 6171 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6172 6173 // Unlike most lookups, we don't always want to hide tag 6174 // declarations: tag names are visible through the using declaration 6175 // even if hidden by ordinary names, *except* in a dependent context 6176 // where it's important for the sanity of two-phase lookup. 6177 if (!IsInstantiation) 6178 R.setHideTags(false); 6179 6180 LookupQualifiedName(R, LookupContext); 6181 6182 if (R.empty()) { 6183 Diag(IdentLoc, diag::err_no_member) 6184 << NameInfo.getName() << LookupContext << SS.getRange(); 6185 UD->setInvalidDecl(); 6186 return UD; 6187 } 6188 6189 if (R.isAmbiguous()) { 6190 UD->setInvalidDecl(); 6191 return UD; 6192 } 6193 6194 if (IsTypeName) { 6195 // If we asked for a typename and got a non-type decl, error out. 6196 if (!R.getAsSingle<TypeDecl>()) { 6197 Diag(IdentLoc, diag::err_using_typename_non_type); 6198 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6199 Diag((*I)->getUnderlyingDecl()->getLocation(), 6200 diag::note_using_decl_target); 6201 UD->setInvalidDecl(); 6202 return UD; 6203 } 6204 } else { 6205 // If we asked for a non-typename and we got a type, error out, 6206 // but only if this is an instantiation of an unresolved using 6207 // decl. Otherwise just silently find the type name. 6208 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6209 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6210 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6211 UD->setInvalidDecl(); 6212 return UD; 6213 } 6214 } 6215 6216 // C++0x N2914 [namespace.udecl]p6: 6217 // A using-declaration shall not name a namespace. 6218 if (R.getAsSingle<NamespaceDecl>()) { 6219 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6220 << SS.getRange(); 6221 UD->setInvalidDecl(); 6222 return UD; 6223 } 6224 6225 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6226 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6227 BuildUsingShadowDecl(S, UD, *I); 6228 } 6229 6230 return UD; 6231} 6232 6233/// Additional checks for a using declaration referring to a constructor name. 6234bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6235 if (UD->isTypeName()) { 6236 // FIXME: Cannot specify typename when specifying constructor 6237 return true; 6238 } 6239 6240 const Type *SourceType = UD->getQualifier()->getAsType(); 6241 assert(SourceType && 6242 "Using decl naming constructor doesn't have type in scope spec."); 6243 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6244 6245 // Check whether the named type is a direct base class. 6246 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6247 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6248 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6249 BaseIt != BaseE; ++BaseIt) { 6250 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6251 if (CanonicalSourceType == BaseType) 6252 break; 6253 } 6254 6255 if (BaseIt == BaseE) { 6256 // Did not find SourceType in the bases. 6257 Diag(UD->getUsingLocation(), 6258 diag::err_using_decl_constructor_not_in_direct_base) 6259 << UD->getNameInfo().getSourceRange() 6260 << QualType(SourceType, 0) << TargetClass; 6261 return true; 6262 } 6263 6264 BaseIt->setInheritConstructors(); 6265 6266 return false; 6267} 6268 6269/// Checks that the given using declaration is not an invalid 6270/// redeclaration. Note that this is checking only for the using decl 6271/// itself, not for any ill-formedness among the UsingShadowDecls. 6272bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6273 bool isTypeName, 6274 const CXXScopeSpec &SS, 6275 SourceLocation NameLoc, 6276 const LookupResult &Prev) { 6277 // C++03 [namespace.udecl]p8: 6278 // C++0x [namespace.udecl]p10: 6279 // A using-declaration is a declaration and can therefore be used 6280 // repeatedly where (and only where) multiple declarations are 6281 // allowed. 6282 // 6283 // That's in non-member contexts. 6284 if (!CurContext->getRedeclContext()->isRecord()) 6285 return false; 6286 6287 NestedNameSpecifier *Qual 6288 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6289 6290 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6291 NamedDecl *D = *I; 6292 6293 bool DTypename; 6294 NestedNameSpecifier *DQual; 6295 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6296 DTypename = UD->isTypeName(); 6297 DQual = UD->getQualifier(); 6298 } else if (UnresolvedUsingValueDecl *UD 6299 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6300 DTypename = false; 6301 DQual = UD->getQualifier(); 6302 } else if (UnresolvedUsingTypenameDecl *UD 6303 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6304 DTypename = true; 6305 DQual = UD->getQualifier(); 6306 } else continue; 6307 6308 // using decls differ if one says 'typename' and the other doesn't. 6309 // FIXME: non-dependent using decls? 6310 if (isTypeName != DTypename) continue; 6311 6312 // using decls differ if they name different scopes (but note that 6313 // template instantiation can cause this check to trigger when it 6314 // didn't before instantiation). 6315 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6316 Context.getCanonicalNestedNameSpecifier(DQual)) 6317 continue; 6318 6319 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6320 Diag(D->getLocation(), diag::note_using_decl) << 1; 6321 return true; 6322 } 6323 6324 return false; 6325} 6326 6327 6328/// Checks that the given nested-name qualifier used in a using decl 6329/// in the current context is appropriately related to the current 6330/// scope. If an error is found, diagnoses it and returns true. 6331bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6332 const CXXScopeSpec &SS, 6333 SourceLocation NameLoc) { 6334 DeclContext *NamedContext = computeDeclContext(SS); 6335 6336 if (!CurContext->isRecord()) { 6337 // C++03 [namespace.udecl]p3: 6338 // C++0x [namespace.udecl]p8: 6339 // A using-declaration for a class member shall be a member-declaration. 6340 6341 // If we weren't able to compute a valid scope, it must be a 6342 // dependent class scope. 6343 if (!NamedContext || NamedContext->isRecord()) { 6344 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6345 << SS.getRange(); 6346 return true; 6347 } 6348 6349 // Otherwise, everything is known to be fine. 6350 return false; 6351 } 6352 6353 // The current scope is a record. 6354 6355 // If the named context is dependent, we can't decide much. 6356 if (!NamedContext) { 6357 // FIXME: in C++0x, we can diagnose if we can prove that the 6358 // nested-name-specifier does not refer to a base class, which is 6359 // still possible in some cases. 6360 6361 // Otherwise we have to conservatively report that things might be 6362 // okay. 6363 return false; 6364 } 6365 6366 if (!NamedContext->isRecord()) { 6367 // Ideally this would point at the last name in the specifier, 6368 // but we don't have that level of source info. 6369 Diag(SS.getRange().getBegin(), 6370 diag::err_using_decl_nested_name_specifier_is_not_class) 6371 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6372 return true; 6373 } 6374 6375 if (!NamedContext->isDependentContext() && 6376 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6377 return true; 6378 6379 if (getLangOptions().CPlusPlus0x) { 6380 // C++0x [namespace.udecl]p3: 6381 // In a using-declaration used as a member-declaration, the 6382 // nested-name-specifier shall name a base class of the class 6383 // being defined. 6384 6385 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6386 cast<CXXRecordDecl>(NamedContext))) { 6387 if (CurContext == NamedContext) { 6388 Diag(NameLoc, 6389 diag::err_using_decl_nested_name_specifier_is_current_class) 6390 << SS.getRange(); 6391 return true; 6392 } 6393 6394 Diag(SS.getRange().getBegin(), 6395 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6396 << (NestedNameSpecifier*) SS.getScopeRep() 6397 << cast<CXXRecordDecl>(CurContext) 6398 << SS.getRange(); 6399 return true; 6400 } 6401 6402 return false; 6403 } 6404 6405 // C++03 [namespace.udecl]p4: 6406 // A using-declaration used as a member-declaration shall refer 6407 // to a member of a base class of the class being defined [etc.]. 6408 6409 // Salient point: SS doesn't have to name a base class as long as 6410 // lookup only finds members from base classes. Therefore we can 6411 // diagnose here only if we can prove that that can't happen, 6412 // i.e. if the class hierarchies provably don't intersect. 6413 6414 // TODO: it would be nice if "definitely valid" results were cached 6415 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6416 // need to be repeated. 6417 6418 struct UserData { 6419 llvm::DenseSet<const CXXRecordDecl*> Bases; 6420 6421 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6422 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6423 Data->Bases.insert(Base); 6424 return true; 6425 } 6426 6427 bool hasDependentBases(const CXXRecordDecl *Class) { 6428 return !Class->forallBases(collect, this); 6429 } 6430 6431 /// Returns true if the base is dependent or is one of the 6432 /// accumulated base classes. 6433 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6434 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6435 return !Data->Bases.count(Base); 6436 } 6437 6438 bool mightShareBases(const CXXRecordDecl *Class) { 6439 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6440 } 6441 }; 6442 6443 UserData Data; 6444 6445 // Returns false if we find a dependent base. 6446 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6447 return false; 6448 6449 // Returns false if the class has a dependent base or if it or one 6450 // of its bases is present in the base set of the current context. 6451 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6452 return false; 6453 6454 Diag(SS.getRange().getBegin(), 6455 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6456 << (NestedNameSpecifier*) SS.getScopeRep() 6457 << cast<CXXRecordDecl>(CurContext) 6458 << SS.getRange(); 6459 6460 return true; 6461} 6462 6463Decl *Sema::ActOnAliasDeclaration(Scope *S, 6464 AccessSpecifier AS, 6465 MultiTemplateParamsArg TemplateParamLists, 6466 SourceLocation UsingLoc, 6467 UnqualifiedId &Name, 6468 TypeResult Type) { 6469 // Skip up to the relevant declaration scope. 6470 while (S->getFlags() & Scope::TemplateParamScope) 6471 S = S->getParent(); 6472 assert((S->getFlags() & Scope::DeclScope) && 6473 "got alias-declaration outside of declaration scope"); 6474 6475 if (Type.isInvalid()) 6476 return 0; 6477 6478 bool Invalid = false; 6479 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6480 TypeSourceInfo *TInfo = 0; 6481 GetTypeFromParser(Type.get(), &TInfo); 6482 6483 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6484 return 0; 6485 6486 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6487 UPPC_DeclarationType)) { 6488 Invalid = true; 6489 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6490 TInfo->getTypeLoc().getBeginLoc()); 6491 } 6492 6493 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6494 LookupName(Previous, S); 6495 6496 // Warn about shadowing the name of a template parameter. 6497 if (Previous.isSingleResult() && 6498 Previous.getFoundDecl()->isTemplateParameter()) { 6499 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6500 Previous.clear(); 6501 } 6502 6503 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6504 "name in alias declaration must be an identifier"); 6505 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6506 Name.StartLocation, 6507 Name.Identifier, TInfo); 6508 6509 NewTD->setAccess(AS); 6510 6511 if (Invalid) 6512 NewTD->setInvalidDecl(); 6513 6514 CheckTypedefForVariablyModifiedType(S, NewTD); 6515 Invalid |= NewTD->isInvalidDecl(); 6516 6517 bool Redeclaration = false; 6518 6519 NamedDecl *NewND; 6520 if (TemplateParamLists.size()) { 6521 TypeAliasTemplateDecl *OldDecl = 0; 6522 TemplateParameterList *OldTemplateParams = 0; 6523 6524 if (TemplateParamLists.size() != 1) { 6525 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6526 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6527 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6528 } 6529 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6530 6531 // Only consider previous declarations in the same scope. 6532 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6533 /*ExplicitInstantiationOrSpecialization*/false); 6534 if (!Previous.empty()) { 6535 Redeclaration = true; 6536 6537 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6538 if (!OldDecl && !Invalid) { 6539 Diag(UsingLoc, diag::err_redefinition_different_kind) 6540 << Name.Identifier; 6541 6542 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6543 if (OldD->getLocation().isValid()) 6544 Diag(OldD->getLocation(), diag::note_previous_definition); 6545 6546 Invalid = true; 6547 } 6548 6549 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6550 if (TemplateParameterListsAreEqual(TemplateParams, 6551 OldDecl->getTemplateParameters(), 6552 /*Complain=*/true, 6553 TPL_TemplateMatch)) 6554 OldTemplateParams = OldDecl->getTemplateParameters(); 6555 else 6556 Invalid = true; 6557 6558 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6559 if (!Invalid && 6560 !Context.hasSameType(OldTD->getUnderlyingType(), 6561 NewTD->getUnderlyingType())) { 6562 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6563 // but we can't reasonably accept it. 6564 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6565 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6566 if (OldTD->getLocation().isValid()) 6567 Diag(OldTD->getLocation(), diag::note_previous_definition); 6568 Invalid = true; 6569 } 6570 } 6571 } 6572 6573 // Merge any previous default template arguments into our parameters, 6574 // and check the parameter list. 6575 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6576 TPC_TypeAliasTemplate)) 6577 return 0; 6578 6579 TypeAliasTemplateDecl *NewDecl = 6580 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6581 Name.Identifier, TemplateParams, 6582 NewTD); 6583 6584 NewDecl->setAccess(AS); 6585 6586 if (Invalid) 6587 NewDecl->setInvalidDecl(); 6588 else if (OldDecl) 6589 NewDecl->setPreviousDeclaration(OldDecl); 6590 6591 NewND = NewDecl; 6592 } else { 6593 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6594 NewND = NewTD; 6595 } 6596 6597 if (!Redeclaration) 6598 PushOnScopeChains(NewND, S); 6599 6600 return NewND; 6601} 6602 6603Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6604 SourceLocation NamespaceLoc, 6605 SourceLocation AliasLoc, 6606 IdentifierInfo *Alias, 6607 CXXScopeSpec &SS, 6608 SourceLocation IdentLoc, 6609 IdentifierInfo *Ident) { 6610 6611 // Lookup the namespace name. 6612 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6613 LookupParsedName(R, S, &SS); 6614 6615 // Check if we have a previous declaration with the same name. 6616 NamedDecl *PrevDecl 6617 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6618 ForRedeclaration); 6619 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6620 PrevDecl = 0; 6621 6622 if (PrevDecl) { 6623 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6624 // We already have an alias with the same name that points to the same 6625 // namespace, so don't create a new one. 6626 // FIXME: At some point, we'll want to create the (redundant) 6627 // declaration to maintain better source information. 6628 if (!R.isAmbiguous() && !R.empty() && 6629 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6630 return 0; 6631 } 6632 6633 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6634 diag::err_redefinition_different_kind; 6635 Diag(AliasLoc, DiagID) << Alias; 6636 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6637 return 0; 6638 } 6639 6640 if (R.isAmbiguous()) 6641 return 0; 6642 6643 if (R.empty()) { 6644 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6645 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6646 return 0; 6647 } 6648 } 6649 6650 NamespaceAliasDecl *AliasDecl = 6651 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6652 Alias, SS.getWithLocInContext(Context), 6653 IdentLoc, R.getFoundDecl()); 6654 6655 PushOnScopeChains(AliasDecl, S); 6656 return AliasDecl; 6657} 6658 6659namespace { 6660 /// \brief Scoped object used to handle the state changes required in Sema 6661 /// to implicitly define the body of a C++ member function; 6662 class ImplicitlyDefinedFunctionScope { 6663 Sema &S; 6664 Sema::ContextRAII SavedContext; 6665 6666 public: 6667 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6668 : S(S), SavedContext(S, Method) 6669 { 6670 S.PushFunctionScope(); 6671 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6672 } 6673 6674 ~ImplicitlyDefinedFunctionScope() { 6675 S.PopExpressionEvaluationContext(); 6676 S.PopFunctionOrBlockScope(); 6677 } 6678 }; 6679} 6680 6681Sema::ImplicitExceptionSpecification 6682Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6683 // C++ [except.spec]p14: 6684 // An implicitly declared special member function (Clause 12) shall have an 6685 // exception-specification. [...] 6686 ImplicitExceptionSpecification ExceptSpec(Context); 6687 if (ClassDecl->isInvalidDecl()) 6688 return ExceptSpec; 6689 6690 // Direct base-class constructors. 6691 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6692 BEnd = ClassDecl->bases_end(); 6693 B != BEnd; ++B) { 6694 if (B->isVirtual()) // Handled below. 6695 continue; 6696 6697 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6698 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6699 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6700 // If this is a deleted function, add it anyway. This might be conformant 6701 // with the standard. This might not. I'm not sure. It might not matter. 6702 if (Constructor) 6703 ExceptSpec.CalledDecl(Constructor); 6704 } 6705 } 6706 6707 // Virtual base-class constructors. 6708 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6709 BEnd = ClassDecl->vbases_end(); 6710 B != BEnd; ++B) { 6711 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6712 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6713 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6714 // If this is a deleted function, add it anyway. This might be conformant 6715 // with the standard. This might not. I'm not sure. It might not matter. 6716 if (Constructor) 6717 ExceptSpec.CalledDecl(Constructor); 6718 } 6719 } 6720 6721 // Field constructors. 6722 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6723 FEnd = ClassDecl->field_end(); 6724 F != FEnd; ++F) { 6725 if (F->hasInClassInitializer()) { 6726 if (Expr *E = F->getInClassInitializer()) 6727 ExceptSpec.CalledExpr(E); 6728 else if (!F->isInvalidDecl()) 6729 ExceptSpec.SetDelayed(); 6730 } else if (const RecordType *RecordTy 6731 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6732 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6733 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6734 // If this is a deleted function, add it anyway. This might be conformant 6735 // with the standard. This might not. I'm not sure. It might not matter. 6736 // In particular, the problem is that this function never gets called. It 6737 // might just be ill-formed because this function attempts to refer to 6738 // a deleted function here. 6739 if (Constructor) 6740 ExceptSpec.CalledDecl(Constructor); 6741 } 6742 } 6743 6744 return ExceptSpec; 6745} 6746 6747CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6748 CXXRecordDecl *ClassDecl) { 6749 // C++ [class.ctor]p5: 6750 // A default constructor for a class X is a constructor of class X 6751 // that can be called without an argument. If there is no 6752 // user-declared constructor for class X, a default constructor is 6753 // implicitly declared. An implicitly-declared default constructor 6754 // is an inline public member of its class. 6755 assert(!ClassDecl->hasUserDeclaredConstructor() && 6756 "Should not build implicit default constructor!"); 6757 6758 ImplicitExceptionSpecification Spec = 6759 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6760 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6761 6762 // Create the actual constructor declaration. 6763 CanQualType ClassType 6764 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6765 SourceLocation ClassLoc = ClassDecl->getLocation(); 6766 DeclarationName Name 6767 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6768 DeclarationNameInfo NameInfo(Name, ClassLoc); 6769 CXXConstructorDecl *DefaultCon 6770 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6771 Context.getFunctionType(Context.VoidTy, 6772 0, 0, EPI), 6773 /*TInfo=*/0, 6774 /*isExplicit=*/false, 6775 /*isInline=*/true, 6776 /*isImplicitlyDeclared=*/true, 6777 // FIXME: apply the rules for definitions here 6778 /*isConstexpr=*/false); 6779 DefaultCon->setAccess(AS_public); 6780 DefaultCon->setDefaulted(); 6781 DefaultCon->setImplicit(); 6782 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6783 6784 // Note that we have declared this constructor. 6785 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6786 6787 if (Scope *S = getScopeForContext(ClassDecl)) 6788 PushOnScopeChains(DefaultCon, S, false); 6789 ClassDecl->addDecl(DefaultCon); 6790 6791 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6792 DefaultCon->setDeletedAsWritten(); 6793 6794 return DefaultCon; 6795} 6796 6797void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6798 CXXConstructorDecl *Constructor) { 6799 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6800 !Constructor->doesThisDeclarationHaveABody() && 6801 !Constructor->isDeleted()) && 6802 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6803 6804 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6805 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6806 6807 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6808 DiagnosticErrorTrap Trap(Diags); 6809 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6810 Trap.hasErrorOccurred()) { 6811 Diag(CurrentLocation, diag::note_member_synthesized_at) 6812 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6813 Constructor->setInvalidDecl(); 6814 return; 6815 } 6816 6817 SourceLocation Loc = Constructor->getLocation(); 6818 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6819 6820 Constructor->setUsed(); 6821 MarkVTableUsed(CurrentLocation, ClassDecl); 6822 6823 if (ASTMutationListener *L = getASTMutationListener()) { 6824 L->CompletedImplicitDefinition(Constructor); 6825 } 6826} 6827 6828/// Get any existing defaulted default constructor for the given class. Do not 6829/// implicitly define one if it does not exist. 6830static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6831 CXXRecordDecl *D) { 6832 ASTContext &Context = Self.Context; 6833 QualType ClassType = Context.getTypeDeclType(D); 6834 DeclarationName ConstructorName 6835 = Context.DeclarationNames.getCXXConstructorName( 6836 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6837 6838 DeclContext::lookup_const_iterator Con, ConEnd; 6839 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6840 Con != ConEnd; ++Con) { 6841 // A function template cannot be defaulted. 6842 if (isa<FunctionTemplateDecl>(*Con)) 6843 continue; 6844 6845 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6846 if (Constructor->isDefaultConstructor()) 6847 return Constructor->isDefaulted() ? Constructor : 0; 6848 } 6849 return 0; 6850} 6851 6852void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6853 if (!D) return; 6854 AdjustDeclIfTemplate(D); 6855 6856 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6857 CXXConstructorDecl *CtorDecl 6858 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6859 6860 if (!CtorDecl) return; 6861 6862 // Compute the exception specification for the default constructor. 6863 const FunctionProtoType *CtorTy = 6864 CtorDecl->getType()->castAs<FunctionProtoType>(); 6865 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6866 ImplicitExceptionSpecification Spec = 6867 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6868 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6869 assert(EPI.ExceptionSpecType != EST_Delayed); 6870 6871 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6872 } 6873 6874 // If the default constructor is explicitly defaulted, checking the exception 6875 // specification is deferred until now. 6876 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6877 !ClassDecl->isDependentType()) 6878 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6879} 6880 6881void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6882 // We start with an initial pass over the base classes to collect those that 6883 // inherit constructors from. If there are none, we can forgo all further 6884 // processing. 6885 typedef SmallVector<const RecordType *, 4> BasesVector; 6886 BasesVector BasesToInheritFrom; 6887 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6888 BaseE = ClassDecl->bases_end(); 6889 BaseIt != BaseE; ++BaseIt) { 6890 if (BaseIt->getInheritConstructors()) { 6891 QualType Base = BaseIt->getType(); 6892 if (Base->isDependentType()) { 6893 // If we inherit constructors from anything that is dependent, just 6894 // abort processing altogether. We'll get another chance for the 6895 // instantiations. 6896 return; 6897 } 6898 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6899 } 6900 } 6901 if (BasesToInheritFrom.empty()) 6902 return; 6903 6904 // Now collect the constructors that we already have in the current class. 6905 // Those take precedence over inherited constructors. 6906 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6907 // unless there is a user-declared constructor with the same signature in 6908 // the class where the using-declaration appears. 6909 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6910 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6911 CtorE = ClassDecl->ctor_end(); 6912 CtorIt != CtorE; ++CtorIt) { 6913 ExistingConstructors.insert( 6914 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6915 } 6916 6917 Scope *S = getScopeForContext(ClassDecl); 6918 DeclarationName CreatedCtorName = 6919 Context.DeclarationNames.getCXXConstructorName( 6920 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6921 6922 // Now comes the true work. 6923 // First, we keep a map from constructor types to the base that introduced 6924 // them. Needed for finding conflicting constructors. We also keep the 6925 // actually inserted declarations in there, for pretty diagnostics. 6926 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6927 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6928 ConstructorToSourceMap InheritedConstructors; 6929 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6930 BaseE = BasesToInheritFrom.end(); 6931 BaseIt != BaseE; ++BaseIt) { 6932 const RecordType *Base = *BaseIt; 6933 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6934 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6935 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6936 CtorE = BaseDecl->ctor_end(); 6937 CtorIt != CtorE; ++CtorIt) { 6938 // Find the using declaration for inheriting this base's constructors. 6939 DeclarationName Name = 6940 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6941 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6942 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6943 SourceLocation UsingLoc = UD ? UD->getLocation() : 6944 ClassDecl->getLocation(); 6945 6946 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6947 // from the class X named in the using-declaration consists of actual 6948 // constructors and notional constructors that result from the 6949 // transformation of defaulted parameters as follows: 6950 // - all non-template default constructors of X, and 6951 // - for each non-template constructor of X that has at least one 6952 // parameter with a default argument, the set of constructors that 6953 // results from omitting any ellipsis parameter specification and 6954 // successively omitting parameters with a default argument from the 6955 // end of the parameter-type-list. 6956 CXXConstructorDecl *BaseCtor = *CtorIt; 6957 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6958 const FunctionProtoType *BaseCtorType = 6959 BaseCtor->getType()->getAs<FunctionProtoType>(); 6960 6961 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6962 maxParams = BaseCtor->getNumParams(); 6963 params <= maxParams; ++params) { 6964 // Skip default constructors. They're never inherited. 6965 if (params == 0) 6966 continue; 6967 // Skip copy and move constructors for the same reason. 6968 if (CanBeCopyOrMove && params == 1) 6969 continue; 6970 6971 // Build up a function type for this particular constructor. 6972 // FIXME: The working paper does not consider that the exception spec 6973 // for the inheriting constructor might be larger than that of the 6974 // source. This code doesn't yet, either. When it does, this code will 6975 // need to be delayed until after exception specifications and in-class 6976 // member initializers are attached. 6977 const Type *NewCtorType; 6978 if (params == maxParams) 6979 NewCtorType = BaseCtorType; 6980 else { 6981 SmallVector<QualType, 16> Args; 6982 for (unsigned i = 0; i < params; ++i) { 6983 Args.push_back(BaseCtorType->getArgType(i)); 6984 } 6985 FunctionProtoType::ExtProtoInfo ExtInfo = 6986 BaseCtorType->getExtProtoInfo(); 6987 ExtInfo.Variadic = false; 6988 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6989 Args.data(), params, ExtInfo) 6990 .getTypePtr(); 6991 } 6992 const Type *CanonicalNewCtorType = 6993 Context.getCanonicalType(NewCtorType); 6994 6995 // Now that we have the type, first check if the class already has a 6996 // constructor with this signature. 6997 if (ExistingConstructors.count(CanonicalNewCtorType)) 6998 continue; 6999 7000 // Then we check if we have already declared an inherited constructor 7001 // with this signature. 7002 std::pair<ConstructorToSourceMap::iterator, bool> result = 7003 InheritedConstructors.insert(std::make_pair( 7004 CanonicalNewCtorType, 7005 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7006 if (!result.second) { 7007 // Already in the map. If it came from a different class, that's an 7008 // error. Not if it's from the same. 7009 CanQualType PreviousBase = result.first->second.first; 7010 if (CanonicalBase != PreviousBase) { 7011 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7012 const CXXConstructorDecl *PrevBaseCtor = 7013 PrevCtor->getInheritedConstructor(); 7014 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7015 7016 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7017 Diag(BaseCtor->getLocation(), 7018 diag::note_using_decl_constructor_conflict_current_ctor); 7019 Diag(PrevBaseCtor->getLocation(), 7020 diag::note_using_decl_constructor_conflict_previous_ctor); 7021 Diag(PrevCtor->getLocation(), 7022 diag::note_using_decl_constructor_conflict_previous_using); 7023 } 7024 continue; 7025 } 7026 7027 // OK, we're there, now add the constructor. 7028 // C++0x [class.inhctor]p8: [...] that would be performed by a 7029 // user-written inline constructor [...] 7030 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7031 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7032 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7033 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7034 /*ImplicitlyDeclared=*/true, 7035 // FIXME: Due to a defect in the standard, we treat inherited 7036 // constructors as constexpr even if that makes them ill-formed. 7037 /*Constexpr=*/BaseCtor->isConstexpr()); 7038 NewCtor->setAccess(BaseCtor->getAccess()); 7039 7040 // Build up the parameter decls and add them. 7041 SmallVector<ParmVarDecl *, 16> ParamDecls; 7042 for (unsigned i = 0; i < params; ++i) { 7043 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7044 UsingLoc, UsingLoc, 7045 /*IdentifierInfo=*/0, 7046 BaseCtorType->getArgType(i), 7047 /*TInfo=*/0, SC_None, 7048 SC_None, /*DefaultArg=*/0)); 7049 } 7050 NewCtor->setParams(ParamDecls); 7051 NewCtor->setInheritedConstructor(BaseCtor); 7052 7053 PushOnScopeChains(NewCtor, S, false); 7054 ClassDecl->addDecl(NewCtor); 7055 result.first->second.second = NewCtor; 7056 } 7057 } 7058 } 7059} 7060 7061Sema::ImplicitExceptionSpecification 7062Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7063 // C++ [except.spec]p14: 7064 // An implicitly declared special member function (Clause 12) shall have 7065 // an exception-specification. 7066 ImplicitExceptionSpecification ExceptSpec(Context); 7067 if (ClassDecl->isInvalidDecl()) 7068 return ExceptSpec; 7069 7070 // Direct base-class destructors. 7071 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7072 BEnd = ClassDecl->bases_end(); 7073 B != BEnd; ++B) { 7074 if (B->isVirtual()) // Handled below. 7075 continue; 7076 7077 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7078 ExceptSpec.CalledDecl( 7079 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7080 } 7081 7082 // Virtual base-class destructors. 7083 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7084 BEnd = ClassDecl->vbases_end(); 7085 B != BEnd; ++B) { 7086 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7087 ExceptSpec.CalledDecl( 7088 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7089 } 7090 7091 // Field destructors. 7092 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7093 FEnd = ClassDecl->field_end(); 7094 F != FEnd; ++F) { 7095 if (const RecordType *RecordTy 7096 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7097 ExceptSpec.CalledDecl( 7098 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7099 } 7100 7101 return ExceptSpec; 7102} 7103 7104CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7105 // C++ [class.dtor]p2: 7106 // If a class has no user-declared destructor, a destructor is 7107 // declared implicitly. An implicitly-declared destructor is an 7108 // inline public member of its class. 7109 7110 ImplicitExceptionSpecification Spec = 7111 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7112 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7113 7114 // Create the actual destructor declaration. 7115 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7116 7117 CanQualType ClassType 7118 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7119 SourceLocation ClassLoc = ClassDecl->getLocation(); 7120 DeclarationName Name 7121 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7122 DeclarationNameInfo NameInfo(Name, ClassLoc); 7123 CXXDestructorDecl *Destructor 7124 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7125 /*isInline=*/true, 7126 /*isImplicitlyDeclared=*/true); 7127 Destructor->setAccess(AS_public); 7128 Destructor->setDefaulted(); 7129 Destructor->setImplicit(); 7130 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7131 7132 // Note that we have declared this destructor. 7133 ++ASTContext::NumImplicitDestructorsDeclared; 7134 7135 // Introduce this destructor into its scope. 7136 if (Scope *S = getScopeForContext(ClassDecl)) 7137 PushOnScopeChains(Destructor, S, false); 7138 ClassDecl->addDecl(Destructor); 7139 7140 // This could be uniqued if it ever proves significant. 7141 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7142 7143 if (ShouldDeleteDestructor(Destructor)) 7144 Destructor->setDeletedAsWritten(); 7145 7146 AddOverriddenMethods(ClassDecl, Destructor); 7147 7148 return Destructor; 7149} 7150 7151void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7152 CXXDestructorDecl *Destructor) { 7153 assert((Destructor->isDefaulted() && 7154 !Destructor->doesThisDeclarationHaveABody()) && 7155 "DefineImplicitDestructor - call it for implicit default dtor"); 7156 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7157 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7158 7159 if (Destructor->isInvalidDecl()) 7160 return; 7161 7162 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7163 7164 DiagnosticErrorTrap Trap(Diags); 7165 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7166 Destructor->getParent()); 7167 7168 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7169 Diag(CurrentLocation, diag::note_member_synthesized_at) 7170 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7171 7172 Destructor->setInvalidDecl(); 7173 return; 7174 } 7175 7176 SourceLocation Loc = Destructor->getLocation(); 7177 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7178 Destructor->setImplicitlyDefined(true); 7179 Destructor->setUsed(); 7180 MarkVTableUsed(CurrentLocation, ClassDecl); 7181 7182 if (ASTMutationListener *L = getASTMutationListener()) { 7183 L->CompletedImplicitDefinition(Destructor); 7184 } 7185} 7186 7187void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7188 CXXDestructorDecl *destructor) { 7189 // C++11 [class.dtor]p3: 7190 // A declaration of a destructor that does not have an exception- 7191 // specification is implicitly considered to have the same exception- 7192 // specification as an implicit declaration. 7193 const FunctionProtoType *dtorType = destructor->getType()-> 7194 getAs<FunctionProtoType>(); 7195 if (dtorType->hasExceptionSpec()) 7196 return; 7197 7198 ImplicitExceptionSpecification exceptSpec = 7199 ComputeDefaultedDtorExceptionSpec(classDecl); 7200 7201 // Replace the destructor's type, building off the existing one. Fortunately, 7202 // the only thing of interest in the destructor type is its extended info. 7203 // The return and arguments are fixed. 7204 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7205 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7206 epi.NumExceptions = exceptSpec.size(); 7207 epi.Exceptions = exceptSpec.data(); 7208 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7209 7210 destructor->setType(ty); 7211 7212 // FIXME: If the destructor has a body that could throw, and the newly created 7213 // spec doesn't allow exceptions, we should emit a warning, because this 7214 // change in behavior can break conforming C++03 programs at runtime. 7215 // However, we don't have a body yet, so it needs to be done somewhere else. 7216} 7217 7218/// \brief Builds a statement that copies/moves the given entity from \p From to 7219/// \c To. 7220/// 7221/// This routine is used to copy/move the members of a class with an 7222/// implicitly-declared copy/move assignment operator. When the entities being 7223/// copied are arrays, this routine builds for loops to copy them. 7224/// 7225/// \param S The Sema object used for type-checking. 7226/// 7227/// \param Loc The location where the implicit copy/move is being generated. 7228/// 7229/// \param T The type of the expressions being copied/moved. Both expressions 7230/// must have this type. 7231/// 7232/// \param To The expression we are copying/moving to. 7233/// 7234/// \param From The expression we are copying/moving from. 7235/// 7236/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7237/// Otherwise, it's a non-static member subobject. 7238/// 7239/// \param Copying Whether we're copying or moving. 7240/// 7241/// \param Depth Internal parameter recording the depth of the recursion. 7242/// 7243/// \returns A statement or a loop that copies the expressions. 7244static StmtResult 7245BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7246 Expr *To, Expr *From, 7247 bool CopyingBaseSubobject, bool Copying, 7248 unsigned Depth = 0) { 7249 // C++0x [class.copy]p28: 7250 // Each subobject is assigned in the manner appropriate to its type: 7251 // 7252 // - if the subobject is of class type, as if by a call to operator= with 7253 // the subobject as the object expression and the corresponding 7254 // subobject of x as a single function argument (as if by explicit 7255 // qualification; that is, ignoring any possible virtual overriding 7256 // functions in more derived classes); 7257 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7258 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7259 7260 // Look for operator=. 7261 DeclarationName Name 7262 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7263 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7264 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7265 7266 // Filter out any result that isn't a copy/move-assignment operator. 7267 LookupResult::Filter F = OpLookup.makeFilter(); 7268 while (F.hasNext()) { 7269 NamedDecl *D = F.next(); 7270 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7271 if (Copying ? Method->isCopyAssignmentOperator() : 7272 Method->isMoveAssignmentOperator()) 7273 continue; 7274 7275 F.erase(); 7276 } 7277 F.done(); 7278 7279 // Suppress the protected check (C++ [class.protected]) for each of the 7280 // assignment operators we found. This strange dance is required when 7281 // we're assigning via a base classes's copy-assignment operator. To 7282 // ensure that we're getting the right base class subobject (without 7283 // ambiguities), we need to cast "this" to that subobject type; to 7284 // ensure that we don't go through the virtual call mechanism, we need 7285 // to qualify the operator= name with the base class (see below). However, 7286 // this means that if the base class has a protected copy assignment 7287 // operator, the protected member access check will fail. So, we 7288 // rewrite "protected" access to "public" access in this case, since we 7289 // know by construction that we're calling from a derived class. 7290 if (CopyingBaseSubobject) { 7291 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7292 L != LEnd; ++L) { 7293 if (L.getAccess() == AS_protected) 7294 L.setAccess(AS_public); 7295 } 7296 } 7297 7298 // Create the nested-name-specifier that will be used to qualify the 7299 // reference to operator=; this is required to suppress the virtual 7300 // call mechanism. 7301 CXXScopeSpec SS; 7302 SS.MakeTrivial(S.Context, 7303 NestedNameSpecifier::Create(S.Context, 0, false, 7304 T.getTypePtr()), 7305 Loc); 7306 7307 // Create the reference to operator=. 7308 ExprResult OpEqualRef 7309 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7310 /*FirstQualifierInScope=*/0, OpLookup, 7311 /*TemplateArgs=*/0, 7312 /*SuppressQualifierCheck=*/true); 7313 if (OpEqualRef.isInvalid()) 7314 return StmtError(); 7315 7316 // Build the call to the assignment operator. 7317 7318 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7319 OpEqualRef.takeAs<Expr>(), 7320 Loc, &From, 1, Loc); 7321 if (Call.isInvalid()) 7322 return StmtError(); 7323 7324 return S.Owned(Call.takeAs<Stmt>()); 7325 } 7326 7327 // - if the subobject is of scalar type, the built-in assignment 7328 // operator is used. 7329 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7330 if (!ArrayTy) { 7331 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7332 if (Assignment.isInvalid()) 7333 return StmtError(); 7334 7335 return S.Owned(Assignment.takeAs<Stmt>()); 7336 } 7337 7338 // - if the subobject is an array, each element is assigned, in the 7339 // manner appropriate to the element type; 7340 7341 // Construct a loop over the array bounds, e.g., 7342 // 7343 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7344 // 7345 // that will copy each of the array elements. 7346 QualType SizeType = S.Context.getSizeType(); 7347 7348 // Create the iteration variable. 7349 IdentifierInfo *IterationVarName = 0; 7350 { 7351 llvm::SmallString<8> Str; 7352 llvm::raw_svector_ostream OS(Str); 7353 OS << "__i" << Depth; 7354 IterationVarName = &S.Context.Idents.get(OS.str()); 7355 } 7356 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7357 IterationVarName, SizeType, 7358 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7359 SC_None, SC_None); 7360 7361 // Initialize the iteration variable to zero. 7362 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7363 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7364 7365 // Create a reference to the iteration variable; we'll use this several 7366 // times throughout. 7367 Expr *IterationVarRef 7368 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7369 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7370 7371 // Create the DeclStmt that holds the iteration variable. 7372 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7373 7374 // Create the comparison against the array bound. 7375 llvm::APInt Upper 7376 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7377 Expr *Comparison 7378 = new (S.Context) BinaryOperator(IterationVarRef, 7379 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7380 BO_NE, S.Context.BoolTy, 7381 VK_RValue, OK_Ordinary, Loc); 7382 7383 // Create the pre-increment of the iteration variable. 7384 Expr *Increment 7385 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7386 VK_LValue, OK_Ordinary, Loc); 7387 7388 // Subscript the "from" and "to" expressions with the iteration variable. 7389 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7390 IterationVarRef, Loc)); 7391 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7392 IterationVarRef, Loc)); 7393 if (!Copying) // Cast to rvalue 7394 From = CastForMoving(S, From); 7395 7396 // Build the copy/move for an individual element of the array. 7397 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7398 To, From, CopyingBaseSubobject, 7399 Copying, Depth + 1); 7400 if (Copy.isInvalid()) 7401 return StmtError(); 7402 7403 // Construct the loop that copies all elements of this array. 7404 return S.ActOnForStmt(Loc, Loc, InitStmt, 7405 S.MakeFullExpr(Comparison), 7406 0, S.MakeFullExpr(Increment), 7407 Loc, Copy.take()); 7408} 7409 7410std::pair<Sema::ImplicitExceptionSpecification, bool> 7411Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7412 CXXRecordDecl *ClassDecl) { 7413 if (ClassDecl->isInvalidDecl()) 7414 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7415 7416 // C++ [class.copy]p10: 7417 // If the class definition does not explicitly declare a copy 7418 // assignment operator, one is declared implicitly. 7419 // The implicitly-defined copy assignment operator for a class X 7420 // will have the form 7421 // 7422 // X& X::operator=(const X&) 7423 // 7424 // if 7425 bool HasConstCopyAssignment = true; 7426 7427 // -- each direct base class B of X has a copy assignment operator 7428 // whose parameter is of type const B&, const volatile B& or B, 7429 // and 7430 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7431 BaseEnd = ClassDecl->bases_end(); 7432 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7433 // We'll handle this below 7434 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7435 continue; 7436 7437 assert(!Base->getType()->isDependentType() && 7438 "Cannot generate implicit members for class with dependent bases."); 7439 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7440 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7441 &HasConstCopyAssignment); 7442 } 7443 7444 // In C++11, the above citation has "or virtual" added 7445 if (LangOpts.CPlusPlus0x) { 7446 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7447 BaseEnd = ClassDecl->vbases_end(); 7448 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7449 assert(!Base->getType()->isDependentType() && 7450 "Cannot generate implicit members for class with dependent bases."); 7451 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7452 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7453 &HasConstCopyAssignment); 7454 } 7455 } 7456 7457 // -- for all the nonstatic data members of X that are of a class 7458 // type M (or array thereof), each such class type has a copy 7459 // assignment operator whose parameter is of type const M&, 7460 // const volatile M& or M. 7461 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7462 FieldEnd = ClassDecl->field_end(); 7463 HasConstCopyAssignment && Field != FieldEnd; 7464 ++Field) { 7465 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7466 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7467 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7468 &HasConstCopyAssignment); 7469 } 7470 } 7471 7472 // Otherwise, the implicitly declared copy assignment operator will 7473 // have the form 7474 // 7475 // X& X::operator=(X&) 7476 7477 // C++ [except.spec]p14: 7478 // An implicitly declared special member function (Clause 12) shall have an 7479 // exception-specification. [...] 7480 7481 // It is unspecified whether or not an implicit copy assignment operator 7482 // attempts to deduplicate calls to assignment operators of virtual bases are 7483 // made. As such, this exception specification is effectively unspecified. 7484 // Based on a similar decision made for constness in C++0x, we're erring on 7485 // the side of assuming such calls to be made regardless of whether they 7486 // actually happen. 7487 ImplicitExceptionSpecification ExceptSpec(Context); 7488 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7489 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7490 BaseEnd = ClassDecl->bases_end(); 7491 Base != BaseEnd; ++Base) { 7492 if (Base->isVirtual()) 7493 continue; 7494 7495 CXXRecordDecl *BaseClassDecl 7496 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7497 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7498 ArgQuals, false, 0)) 7499 ExceptSpec.CalledDecl(CopyAssign); 7500 } 7501 7502 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7503 BaseEnd = ClassDecl->vbases_end(); 7504 Base != BaseEnd; ++Base) { 7505 CXXRecordDecl *BaseClassDecl 7506 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7507 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7508 ArgQuals, false, 0)) 7509 ExceptSpec.CalledDecl(CopyAssign); 7510 } 7511 7512 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7513 FieldEnd = ClassDecl->field_end(); 7514 Field != FieldEnd; 7515 ++Field) { 7516 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7517 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7518 if (CXXMethodDecl *CopyAssign = 7519 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7520 ExceptSpec.CalledDecl(CopyAssign); 7521 } 7522 } 7523 7524 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7525} 7526 7527CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7528 // Note: The following rules are largely analoguous to the copy 7529 // constructor rules. Note that virtual bases are not taken into account 7530 // for determining the argument type of the operator. Note also that 7531 // operators taking an object instead of a reference are allowed. 7532 7533 ImplicitExceptionSpecification Spec(Context); 7534 bool Const; 7535 llvm::tie(Spec, Const) = 7536 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7537 7538 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7539 QualType RetType = Context.getLValueReferenceType(ArgType); 7540 if (Const) 7541 ArgType = ArgType.withConst(); 7542 ArgType = Context.getLValueReferenceType(ArgType); 7543 7544 // An implicitly-declared copy assignment operator is an inline public 7545 // member of its class. 7546 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7547 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7548 SourceLocation ClassLoc = ClassDecl->getLocation(); 7549 DeclarationNameInfo NameInfo(Name, ClassLoc); 7550 CXXMethodDecl *CopyAssignment 7551 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7552 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7553 /*TInfo=*/0, /*isStatic=*/false, 7554 /*StorageClassAsWritten=*/SC_None, 7555 /*isInline=*/true, /*isConstexpr=*/false, 7556 SourceLocation()); 7557 CopyAssignment->setAccess(AS_public); 7558 CopyAssignment->setDefaulted(); 7559 CopyAssignment->setImplicit(); 7560 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7561 7562 // Add the parameter to the operator. 7563 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7564 ClassLoc, ClassLoc, /*Id=*/0, 7565 ArgType, /*TInfo=*/0, 7566 SC_None, 7567 SC_None, 0); 7568 CopyAssignment->setParams(FromParam); 7569 7570 // Note that we have added this copy-assignment operator. 7571 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7572 7573 if (Scope *S = getScopeForContext(ClassDecl)) 7574 PushOnScopeChains(CopyAssignment, S, false); 7575 ClassDecl->addDecl(CopyAssignment); 7576 7577 // C++0x [class.copy]p18: 7578 // ... If the class definition declares a move constructor or move 7579 // assignment operator, the implicitly declared copy assignment operator is 7580 // defined as deleted; ... 7581 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7582 ClassDecl->hasUserDeclaredMoveAssignment() || 7583 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7584 CopyAssignment->setDeletedAsWritten(); 7585 7586 AddOverriddenMethods(ClassDecl, CopyAssignment); 7587 return CopyAssignment; 7588} 7589 7590void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7591 CXXMethodDecl *CopyAssignOperator) { 7592 assert((CopyAssignOperator->isDefaulted() && 7593 CopyAssignOperator->isOverloadedOperator() && 7594 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7595 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7596 "DefineImplicitCopyAssignment called for wrong function"); 7597 7598 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7599 7600 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7601 CopyAssignOperator->setInvalidDecl(); 7602 return; 7603 } 7604 7605 CopyAssignOperator->setUsed(); 7606 7607 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7608 DiagnosticErrorTrap Trap(Diags); 7609 7610 // C++0x [class.copy]p30: 7611 // The implicitly-defined or explicitly-defaulted copy assignment operator 7612 // for a non-union class X performs memberwise copy assignment of its 7613 // subobjects. The direct base classes of X are assigned first, in the 7614 // order of their declaration in the base-specifier-list, and then the 7615 // immediate non-static data members of X are assigned, in the order in 7616 // which they were declared in the class definition. 7617 7618 // The statements that form the synthesized function body. 7619 ASTOwningVector<Stmt*> Statements(*this); 7620 7621 // The parameter for the "other" object, which we are copying from. 7622 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7623 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7624 QualType OtherRefType = Other->getType(); 7625 if (const LValueReferenceType *OtherRef 7626 = OtherRefType->getAs<LValueReferenceType>()) { 7627 OtherRefType = OtherRef->getPointeeType(); 7628 OtherQuals = OtherRefType.getQualifiers(); 7629 } 7630 7631 // Our location for everything implicitly-generated. 7632 SourceLocation Loc = CopyAssignOperator->getLocation(); 7633 7634 // Construct a reference to the "other" object. We'll be using this 7635 // throughout the generated ASTs. 7636 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7637 assert(OtherRef && "Reference to parameter cannot fail!"); 7638 7639 // Construct the "this" pointer. We'll be using this throughout the generated 7640 // ASTs. 7641 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7642 assert(This && "Reference to this cannot fail!"); 7643 7644 // Assign base classes. 7645 bool Invalid = false; 7646 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7647 E = ClassDecl->bases_end(); Base != E; ++Base) { 7648 // Form the assignment: 7649 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7650 QualType BaseType = Base->getType().getUnqualifiedType(); 7651 if (!BaseType->isRecordType()) { 7652 Invalid = true; 7653 continue; 7654 } 7655 7656 CXXCastPath BasePath; 7657 BasePath.push_back(Base); 7658 7659 // Construct the "from" expression, which is an implicit cast to the 7660 // appropriately-qualified base type. 7661 Expr *From = OtherRef; 7662 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7663 CK_UncheckedDerivedToBase, 7664 VK_LValue, &BasePath).take(); 7665 7666 // Dereference "this". 7667 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7668 7669 // Implicitly cast "this" to the appropriately-qualified base type. 7670 To = ImpCastExprToType(To.take(), 7671 Context.getCVRQualifiedType(BaseType, 7672 CopyAssignOperator->getTypeQualifiers()), 7673 CK_UncheckedDerivedToBase, 7674 VK_LValue, &BasePath); 7675 7676 // Build the copy. 7677 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7678 To.get(), From, 7679 /*CopyingBaseSubobject=*/true, 7680 /*Copying=*/true); 7681 if (Copy.isInvalid()) { 7682 Diag(CurrentLocation, diag::note_member_synthesized_at) 7683 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7684 CopyAssignOperator->setInvalidDecl(); 7685 return; 7686 } 7687 7688 // Success! Record the copy. 7689 Statements.push_back(Copy.takeAs<Expr>()); 7690 } 7691 7692 // \brief Reference to the __builtin_memcpy function. 7693 Expr *BuiltinMemCpyRef = 0; 7694 // \brief Reference to the __builtin_objc_memmove_collectable function. 7695 Expr *CollectableMemCpyRef = 0; 7696 7697 // Assign non-static members. 7698 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7699 FieldEnd = ClassDecl->field_end(); 7700 Field != FieldEnd; ++Field) { 7701 if (Field->isUnnamedBitfield()) 7702 continue; 7703 7704 // Check for members of reference type; we can't copy those. 7705 if (Field->getType()->isReferenceType()) { 7706 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7707 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7708 Diag(Field->getLocation(), diag::note_declared_at); 7709 Diag(CurrentLocation, diag::note_member_synthesized_at) 7710 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7711 Invalid = true; 7712 continue; 7713 } 7714 7715 // Check for members of const-qualified, non-class type. 7716 QualType BaseType = Context.getBaseElementType(Field->getType()); 7717 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7718 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7719 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7720 Diag(Field->getLocation(), diag::note_declared_at); 7721 Diag(CurrentLocation, diag::note_member_synthesized_at) 7722 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7723 Invalid = true; 7724 continue; 7725 } 7726 7727 // Suppress assigning zero-width bitfields. 7728 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7729 continue; 7730 7731 QualType FieldType = Field->getType().getNonReferenceType(); 7732 if (FieldType->isIncompleteArrayType()) { 7733 assert(ClassDecl->hasFlexibleArrayMember() && 7734 "Incomplete array type is not valid"); 7735 continue; 7736 } 7737 7738 // Build references to the field in the object we're copying from and to. 7739 CXXScopeSpec SS; // Intentionally empty 7740 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7741 LookupMemberName); 7742 MemberLookup.addDecl(*Field); 7743 MemberLookup.resolveKind(); 7744 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7745 Loc, /*IsArrow=*/false, 7746 SS, 0, MemberLookup, 0); 7747 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7748 Loc, /*IsArrow=*/true, 7749 SS, 0, MemberLookup, 0); 7750 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7751 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7752 7753 // If the field should be copied with __builtin_memcpy rather than via 7754 // explicit assignments, do so. This optimization only applies for arrays 7755 // of scalars and arrays of class type with trivial copy-assignment 7756 // operators. 7757 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7758 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7759 // Compute the size of the memory buffer to be copied. 7760 QualType SizeType = Context.getSizeType(); 7761 llvm::APInt Size(Context.getTypeSize(SizeType), 7762 Context.getTypeSizeInChars(BaseType).getQuantity()); 7763 for (const ConstantArrayType *Array 7764 = Context.getAsConstantArrayType(FieldType); 7765 Array; 7766 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7767 llvm::APInt ArraySize 7768 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7769 Size *= ArraySize; 7770 } 7771 7772 // Take the address of the field references for "from" and "to". 7773 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7774 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7775 7776 bool NeedsCollectableMemCpy = 7777 (BaseType->isRecordType() && 7778 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7779 7780 if (NeedsCollectableMemCpy) { 7781 if (!CollectableMemCpyRef) { 7782 // Create a reference to the __builtin_objc_memmove_collectable function. 7783 LookupResult R(*this, 7784 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7785 Loc, LookupOrdinaryName); 7786 LookupName(R, TUScope, true); 7787 7788 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7789 if (!CollectableMemCpy) { 7790 // Something went horribly wrong earlier, and we will have 7791 // complained about it. 7792 Invalid = true; 7793 continue; 7794 } 7795 7796 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7797 CollectableMemCpy->getType(), 7798 VK_LValue, Loc, 0).take(); 7799 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7800 } 7801 } 7802 // Create a reference to the __builtin_memcpy builtin function. 7803 else if (!BuiltinMemCpyRef) { 7804 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7805 LookupOrdinaryName); 7806 LookupName(R, TUScope, true); 7807 7808 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7809 if (!BuiltinMemCpy) { 7810 // Something went horribly wrong earlier, and we will have complained 7811 // about it. 7812 Invalid = true; 7813 continue; 7814 } 7815 7816 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7817 BuiltinMemCpy->getType(), 7818 VK_LValue, Loc, 0).take(); 7819 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7820 } 7821 7822 ASTOwningVector<Expr*> CallArgs(*this); 7823 CallArgs.push_back(To.takeAs<Expr>()); 7824 CallArgs.push_back(From.takeAs<Expr>()); 7825 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7826 ExprResult Call = ExprError(); 7827 if (NeedsCollectableMemCpy) 7828 Call = ActOnCallExpr(/*Scope=*/0, 7829 CollectableMemCpyRef, 7830 Loc, move_arg(CallArgs), 7831 Loc); 7832 else 7833 Call = ActOnCallExpr(/*Scope=*/0, 7834 BuiltinMemCpyRef, 7835 Loc, move_arg(CallArgs), 7836 Loc); 7837 7838 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7839 Statements.push_back(Call.takeAs<Expr>()); 7840 continue; 7841 } 7842 7843 // Build the copy of this field. 7844 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7845 To.get(), From.get(), 7846 /*CopyingBaseSubobject=*/false, 7847 /*Copying=*/true); 7848 if (Copy.isInvalid()) { 7849 Diag(CurrentLocation, diag::note_member_synthesized_at) 7850 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7851 CopyAssignOperator->setInvalidDecl(); 7852 return; 7853 } 7854 7855 // Success! Record the copy. 7856 Statements.push_back(Copy.takeAs<Stmt>()); 7857 } 7858 7859 if (!Invalid) { 7860 // Add a "return *this;" 7861 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7862 7863 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7864 if (Return.isInvalid()) 7865 Invalid = true; 7866 else { 7867 Statements.push_back(Return.takeAs<Stmt>()); 7868 7869 if (Trap.hasErrorOccurred()) { 7870 Diag(CurrentLocation, diag::note_member_synthesized_at) 7871 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7872 Invalid = true; 7873 } 7874 } 7875 } 7876 7877 if (Invalid) { 7878 CopyAssignOperator->setInvalidDecl(); 7879 return; 7880 } 7881 7882 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7883 /*isStmtExpr=*/false); 7884 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7885 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7886 7887 if (ASTMutationListener *L = getASTMutationListener()) { 7888 L->CompletedImplicitDefinition(CopyAssignOperator); 7889 } 7890} 7891 7892Sema::ImplicitExceptionSpecification 7893Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7894 ImplicitExceptionSpecification ExceptSpec(Context); 7895 7896 if (ClassDecl->isInvalidDecl()) 7897 return ExceptSpec; 7898 7899 // C++0x [except.spec]p14: 7900 // An implicitly declared special member function (Clause 12) shall have an 7901 // exception-specification. [...] 7902 7903 // It is unspecified whether or not an implicit move assignment operator 7904 // attempts to deduplicate calls to assignment operators of virtual bases are 7905 // made. As such, this exception specification is effectively unspecified. 7906 // Based on a similar decision made for constness in C++0x, we're erring on 7907 // the side of assuming such calls to be made regardless of whether they 7908 // actually happen. 7909 // Note that a move constructor is not implicitly declared when there are 7910 // virtual bases, but it can still be user-declared and explicitly defaulted. 7911 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7912 BaseEnd = ClassDecl->bases_end(); 7913 Base != BaseEnd; ++Base) { 7914 if (Base->isVirtual()) 7915 continue; 7916 7917 CXXRecordDecl *BaseClassDecl 7918 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7919 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7920 false, 0)) 7921 ExceptSpec.CalledDecl(MoveAssign); 7922 } 7923 7924 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7925 BaseEnd = ClassDecl->vbases_end(); 7926 Base != BaseEnd; ++Base) { 7927 CXXRecordDecl *BaseClassDecl 7928 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7929 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7930 false, 0)) 7931 ExceptSpec.CalledDecl(MoveAssign); 7932 } 7933 7934 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7935 FieldEnd = ClassDecl->field_end(); 7936 Field != FieldEnd; 7937 ++Field) { 7938 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7939 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7940 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7941 false, 0)) 7942 ExceptSpec.CalledDecl(MoveAssign); 7943 } 7944 } 7945 7946 return ExceptSpec; 7947} 7948 7949CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7950 // Note: The following rules are largely analoguous to the move 7951 // constructor rules. 7952 7953 ImplicitExceptionSpecification Spec( 7954 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7955 7956 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7957 QualType RetType = Context.getLValueReferenceType(ArgType); 7958 ArgType = Context.getRValueReferenceType(ArgType); 7959 7960 // An implicitly-declared move assignment operator is an inline public 7961 // member of its class. 7962 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7963 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7964 SourceLocation ClassLoc = ClassDecl->getLocation(); 7965 DeclarationNameInfo NameInfo(Name, ClassLoc); 7966 CXXMethodDecl *MoveAssignment 7967 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7968 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7969 /*TInfo=*/0, /*isStatic=*/false, 7970 /*StorageClassAsWritten=*/SC_None, 7971 /*isInline=*/true, 7972 /*isConstexpr=*/false, 7973 SourceLocation()); 7974 MoveAssignment->setAccess(AS_public); 7975 MoveAssignment->setDefaulted(); 7976 MoveAssignment->setImplicit(); 7977 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7978 7979 // Add the parameter to the operator. 7980 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7981 ClassLoc, ClassLoc, /*Id=*/0, 7982 ArgType, /*TInfo=*/0, 7983 SC_None, 7984 SC_None, 0); 7985 MoveAssignment->setParams(FromParam); 7986 7987 // Note that we have added this copy-assignment operator. 7988 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7989 7990 // C++0x [class.copy]p9: 7991 // If the definition of a class X does not explicitly declare a move 7992 // assignment operator, one will be implicitly declared as defaulted if and 7993 // only if: 7994 // [...] 7995 // - the move assignment operator would not be implicitly defined as 7996 // deleted. 7997 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7998 // Cache this result so that we don't try to generate this over and over 7999 // on every lookup, leaking memory and wasting time. 8000 ClassDecl->setFailedImplicitMoveAssignment(); 8001 return 0; 8002 } 8003 8004 if (Scope *S = getScopeForContext(ClassDecl)) 8005 PushOnScopeChains(MoveAssignment, S, false); 8006 ClassDecl->addDecl(MoveAssignment); 8007 8008 AddOverriddenMethods(ClassDecl, MoveAssignment); 8009 return MoveAssignment; 8010} 8011 8012void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8013 CXXMethodDecl *MoveAssignOperator) { 8014 assert((MoveAssignOperator->isDefaulted() && 8015 MoveAssignOperator->isOverloadedOperator() && 8016 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8017 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8018 "DefineImplicitMoveAssignment called for wrong function"); 8019 8020 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8021 8022 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8023 MoveAssignOperator->setInvalidDecl(); 8024 return; 8025 } 8026 8027 MoveAssignOperator->setUsed(); 8028 8029 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8030 DiagnosticErrorTrap Trap(Diags); 8031 8032 // C++0x [class.copy]p28: 8033 // The implicitly-defined or move assignment operator for a non-union class 8034 // X performs memberwise move assignment of its subobjects. The direct base 8035 // classes of X are assigned first, in the order of their declaration in the 8036 // base-specifier-list, and then the immediate non-static data members of X 8037 // are assigned, in the order in which they were declared in the class 8038 // definition. 8039 8040 // The statements that form the synthesized function body. 8041 ASTOwningVector<Stmt*> Statements(*this); 8042 8043 // The parameter for the "other" object, which we are move from. 8044 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8045 QualType OtherRefType = Other->getType()-> 8046 getAs<RValueReferenceType>()->getPointeeType(); 8047 assert(OtherRefType.getQualifiers() == 0 && 8048 "Bad argument type of defaulted move assignment"); 8049 8050 // Our location for everything implicitly-generated. 8051 SourceLocation Loc = MoveAssignOperator->getLocation(); 8052 8053 // Construct a reference to the "other" object. We'll be using this 8054 // throughout the generated ASTs. 8055 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8056 assert(OtherRef && "Reference to parameter cannot fail!"); 8057 // Cast to rvalue. 8058 OtherRef = CastForMoving(*this, OtherRef); 8059 8060 // Construct the "this" pointer. We'll be using this throughout the generated 8061 // ASTs. 8062 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8063 assert(This && "Reference to this cannot fail!"); 8064 8065 // Assign base classes. 8066 bool Invalid = false; 8067 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8068 E = ClassDecl->bases_end(); Base != E; ++Base) { 8069 // Form the assignment: 8070 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8071 QualType BaseType = Base->getType().getUnqualifiedType(); 8072 if (!BaseType->isRecordType()) { 8073 Invalid = true; 8074 continue; 8075 } 8076 8077 CXXCastPath BasePath; 8078 BasePath.push_back(Base); 8079 8080 // Construct the "from" expression, which is an implicit cast to the 8081 // appropriately-qualified base type. 8082 Expr *From = OtherRef; 8083 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8084 VK_XValue, &BasePath).take(); 8085 8086 // Dereference "this". 8087 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8088 8089 // Implicitly cast "this" to the appropriately-qualified base type. 8090 To = ImpCastExprToType(To.take(), 8091 Context.getCVRQualifiedType(BaseType, 8092 MoveAssignOperator->getTypeQualifiers()), 8093 CK_UncheckedDerivedToBase, 8094 VK_LValue, &BasePath); 8095 8096 // Build the move. 8097 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8098 To.get(), From, 8099 /*CopyingBaseSubobject=*/true, 8100 /*Copying=*/false); 8101 if (Move.isInvalid()) { 8102 Diag(CurrentLocation, diag::note_member_synthesized_at) 8103 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8104 MoveAssignOperator->setInvalidDecl(); 8105 return; 8106 } 8107 8108 // Success! Record the move. 8109 Statements.push_back(Move.takeAs<Expr>()); 8110 } 8111 8112 // \brief Reference to the __builtin_memcpy function. 8113 Expr *BuiltinMemCpyRef = 0; 8114 // \brief Reference to the __builtin_objc_memmove_collectable function. 8115 Expr *CollectableMemCpyRef = 0; 8116 8117 // Assign non-static members. 8118 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8119 FieldEnd = ClassDecl->field_end(); 8120 Field != FieldEnd; ++Field) { 8121 if (Field->isUnnamedBitfield()) 8122 continue; 8123 8124 // Check for members of reference type; we can't move those. 8125 if (Field->getType()->isReferenceType()) { 8126 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8127 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8128 Diag(Field->getLocation(), diag::note_declared_at); 8129 Diag(CurrentLocation, diag::note_member_synthesized_at) 8130 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8131 Invalid = true; 8132 continue; 8133 } 8134 8135 // Check for members of const-qualified, non-class type. 8136 QualType BaseType = Context.getBaseElementType(Field->getType()); 8137 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8138 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8139 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8140 Diag(Field->getLocation(), diag::note_declared_at); 8141 Diag(CurrentLocation, diag::note_member_synthesized_at) 8142 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8143 Invalid = true; 8144 continue; 8145 } 8146 8147 // Suppress assigning zero-width bitfields. 8148 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8149 continue; 8150 8151 QualType FieldType = Field->getType().getNonReferenceType(); 8152 if (FieldType->isIncompleteArrayType()) { 8153 assert(ClassDecl->hasFlexibleArrayMember() && 8154 "Incomplete array type is not valid"); 8155 continue; 8156 } 8157 8158 // Build references to the field in the object we're copying from and to. 8159 CXXScopeSpec SS; // Intentionally empty 8160 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8161 LookupMemberName); 8162 MemberLookup.addDecl(*Field); 8163 MemberLookup.resolveKind(); 8164 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8165 Loc, /*IsArrow=*/false, 8166 SS, 0, MemberLookup, 0); 8167 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8168 Loc, /*IsArrow=*/true, 8169 SS, 0, MemberLookup, 0); 8170 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8171 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8172 8173 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8174 "Member reference with rvalue base must be rvalue except for reference " 8175 "members, which aren't allowed for move assignment."); 8176 8177 // If the field should be copied with __builtin_memcpy rather than via 8178 // explicit assignments, do so. This optimization only applies for arrays 8179 // of scalars and arrays of class type with trivial move-assignment 8180 // operators. 8181 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8182 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8183 // Compute the size of the memory buffer to be copied. 8184 QualType SizeType = Context.getSizeType(); 8185 llvm::APInt Size(Context.getTypeSize(SizeType), 8186 Context.getTypeSizeInChars(BaseType).getQuantity()); 8187 for (const ConstantArrayType *Array 8188 = Context.getAsConstantArrayType(FieldType); 8189 Array; 8190 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8191 llvm::APInt ArraySize 8192 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8193 Size *= ArraySize; 8194 } 8195 8196 // Take the address of the field references for "from" and "to". We 8197 // directly construct UnaryOperators here because semantic analysis 8198 // does not permit us to take the address of an xvalue. 8199 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8200 Context.getPointerType(From.get()->getType()), 8201 VK_RValue, OK_Ordinary, Loc); 8202 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8203 Context.getPointerType(To.get()->getType()), 8204 VK_RValue, OK_Ordinary, Loc); 8205 8206 bool NeedsCollectableMemCpy = 8207 (BaseType->isRecordType() && 8208 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8209 8210 if (NeedsCollectableMemCpy) { 8211 if (!CollectableMemCpyRef) { 8212 // Create a reference to the __builtin_objc_memmove_collectable function. 8213 LookupResult R(*this, 8214 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8215 Loc, LookupOrdinaryName); 8216 LookupName(R, TUScope, true); 8217 8218 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8219 if (!CollectableMemCpy) { 8220 // Something went horribly wrong earlier, and we will have 8221 // complained about it. 8222 Invalid = true; 8223 continue; 8224 } 8225 8226 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8227 CollectableMemCpy->getType(), 8228 VK_LValue, Loc, 0).take(); 8229 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8230 } 8231 } 8232 // Create a reference to the __builtin_memcpy builtin function. 8233 else if (!BuiltinMemCpyRef) { 8234 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8235 LookupOrdinaryName); 8236 LookupName(R, TUScope, true); 8237 8238 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8239 if (!BuiltinMemCpy) { 8240 // Something went horribly wrong earlier, and we will have complained 8241 // about it. 8242 Invalid = true; 8243 continue; 8244 } 8245 8246 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8247 BuiltinMemCpy->getType(), 8248 VK_LValue, Loc, 0).take(); 8249 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8250 } 8251 8252 ASTOwningVector<Expr*> CallArgs(*this); 8253 CallArgs.push_back(To.takeAs<Expr>()); 8254 CallArgs.push_back(From.takeAs<Expr>()); 8255 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8256 ExprResult Call = ExprError(); 8257 if (NeedsCollectableMemCpy) 8258 Call = ActOnCallExpr(/*Scope=*/0, 8259 CollectableMemCpyRef, 8260 Loc, move_arg(CallArgs), 8261 Loc); 8262 else 8263 Call = ActOnCallExpr(/*Scope=*/0, 8264 BuiltinMemCpyRef, 8265 Loc, move_arg(CallArgs), 8266 Loc); 8267 8268 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8269 Statements.push_back(Call.takeAs<Expr>()); 8270 continue; 8271 } 8272 8273 // Build the move of this field. 8274 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8275 To.get(), From.get(), 8276 /*CopyingBaseSubobject=*/false, 8277 /*Copying=*/false); 8278 if (Move.isInvalid()) { 8279 Diag(CurrentLocation, diag::note_member_synthesized_at) 8280 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8281 MoveAssignOperator->setInvalidDecl(); 8282 return; 8283 } 8284 8285 // Success! Record the copy. 8286 Statements.push_back(Move.takeAs<Stmt>()); 8287 } 8288 8289 if (!Invalid) { 8290 // Add a "return *this;" 8291 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8292 8293 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8294 if (Return.isInvalid()) 8295 Invalid = true; 8296 else { 8297 Statements.push_back(Return.takeAs<Stmt>()); 8298 8299 if (Trap.hasErrorOccurred()) { 8300 Diag(CurrentLocation, diag::note_member_synthesized_at) 8301 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8302 Invalid = true; 8303 } 8304 } 8305 } 8306 8307 if (Invalid) { 8308 MoveAssignOperator->setInvalidDecl(); 8309 return; 8310 } 8311 8312 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8313 /*isStmtExpr=*/false); 8314 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8315 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8316 8317 if (ASTMutationListener *L = getASTMutationListener()) { 8318 L->CompletedImplicitDefinition(MoveAssignOperator); 8319 } 8320} 8321 8322std::pair<Sema::ImplicitExceptionSpecification, bool> 8323Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8324 if (ClassDecl->isInvalidDecl()) 8325 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8326 8327 // C++ [class.copy]p5: 8328 // The implicitly-declared copy constructor for a class X will 8329 // have the form 8330 // 8331 // X::X(const X&) 8332 // 8333 // if 8334 // FIXME: It ought to be possible to store this on the record. 8335 bool HasConstCopyConstructor = true; 8336 8337 // -- each direct or virtual base class B of X has a copy 8338 // constructor whose first parameter is of type const B& or 8339 // const volatile B&, and 8340 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8341 BaseEnd = ClassDecl->bases_end(); 8342 HasConstCopyConstructor && Base != BaseEnd; 8343 ++Base) { 8344 // Virtual bases are handled below. 8345 if (Base->isVirtual()) 8346 continue; 8347 8348 CXXRecordDecl *BaseClassDecl 8349 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8350 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8351 &HasConstCopyConstructor); 8352 } 8353 8354 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8355 BaseEnd = ClassDecl->vbases_end(); 8356 HasConstCopyConstructor && Base != BaseEnd; 8357 ++Base) { 8358 CXXRecordDecl *BaseClassDecl 8359 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8360 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8361 &HasConstCopyConstructor); 8362 } 8363 8364 // -- for all the nonstatic data members of X that are of a 8365 // class type M (or array thereof), each such class type 8366 // has a copy constructor whose first parameter is of type 8367 // const M& or const volatile M&. 8368 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8369 FieldEnd = ClassDecl->field_end(); 8370 HasConstCopyConstructor && Field != FieldEnd; 8371 ++Field) { 8372 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8373 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8374 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8375 &HasConstCopyConstructor); 8376 } 8377 } 8378 // Otherwise, the implicitly declared copy constructor will have 8379 // the form 8380 // 8381 // X::X(X&) 8382 8383 // C++ [except.spec]p14: 8384 // An implicitly declared special member function (Clause 12) shall have an 8385 // exception-specification. [...] 8386 ImplicitExceptionSpecification ExceptSpec(Context); 8387 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8388 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8389 BaseEnd = ClassDecl->bases_end(); 8390 Base != BaseEnd; 8391 ++Base) { 8392 // Virtual bases are handled below. 8393 if (Base->isVirtual()) 8394 continue; 8395 8396 CXXRecordDecl *BaseClassDecl 8397 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8398 if (CXXConstructorDecl *CopyConstructor = 8399 LookupCopyingConstructor(BaseClassDecl, Quals)) 8400 ExceptSpec.CalledDecl(CopyConstructor); 8401 } 8402 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8403 BaseEnd = ClassDecl->vbases_end(); 8404 Base != BaseEnd; 8405 ++Base) { 8406 CXXRecordDecl *BaseClassDecl 8407 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8408 if (CXXConstructorDecl *CopyConstructor = 8409 LookupCopyingConstructor(BaseClassDecl, Quals)) 8410 ExceptSpec.CalledDecl(CopyConstructor); 8411 } 8412 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8413 FieldEnd = ClassDecl->field_end(); 8414 Field != FieldEnd; 8415 ++Field) { 8416 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8417 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8418 if (CXXConstructorDecl *CopyConstructor = 8419 LookupCopyingConstructor(FieldClassDecl, Quals)) 8420 ExceptSpec.CalledDecl(CopyConstructor); 8421 } 8422 } 8423 8424 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8425} 8426 8427CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8428 CXXRecordDecl *ClassDecl) { 8429 // C++ [class.copy]p4: 8430 // If the class definition does not explicitly declare a copy 8431 // constructor, one is declared implicitly. 8432 8433 ImplicitExceptionSpecification Spec(Context); 8434 bool Const; 8435 llvm::tie(Spec, Const) = 8436 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8437 8438 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8439 QualType ArgType = ClassType; 8440 if (Const) 8441 ArgType = ArgType.withConst(); 8442 ArgType = Context.getLValueReferenceType(ArgType); 8443 8444 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8445 8446 DeclarationName Name 8447 = Context.DeclarationNames.getCXXConstructorName( 8448 Context.getCanonicalType(ClassType)); 8449 SourceLocation ClassLoc = ClassDecl->getLocation(); 8450 DeclarationNameInfo NameInfo(Name, ClassLoc); 8451 8452 // An implicitly-declared copy constructor is an inline public 8453 // member of its class. 8454 CXXConstructorDecl *CopyConstructor 8455 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8456 Context.getFunctionType(Context.VoidTy, 8457 &ArgType, 1, EPI), 8458 /*TInfo=*/0, 8459 /*isExplicit=*/false, 8460 /*isInline=*/true, 8461 /*isImplicitlyDeclared=*/true, 8462 // FIXME: apply the rules for definitions here 8463 /*isConstexpr=*/false); 8464 CopyConstructor->setAccess(AS_public); 8465 CopyConstructor->setDefaulted(); 8466 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8467 8468 // Note that we have declared this constructor. 8469 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8470 8471 // Add the parameter to the constructor. 8472 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8473 ClassLoc, ClassLoc, 8474 /*IdentifierInfo=*/0, 8475 ArgType, /*TInfo=*/0, 8476 SC_None, 8477 SC_None, 0); 8478 CopyConstructor->setParams(FromParam); 8479 8480 if (Scope *S = getScopeForContext(ClassDecl)) 8481 PushOnScopeChains(CopyConstructor, S, false); 8482 ClassDecl->addDecl(CopyConstructor); 8483 8484 // C++0x [class.copy]p7: 8485 // ... If the class definition declares a move constructor or move 8486 // assignment operator, the implicitly declared constructor is defined as 8487 // deleted; ... 8488 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8489 ClassDecl->hasUserDeclaredMoveAssignment() || 8490 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8491 CopyConstructor->setDeletedAsWritten(); 8492 8493 return CopyConstructor; 8494} 8495 8496void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8497 CXXConstructorDecl *CopyConstructor) { 8498 assert((CopyConstructor->isDefaulted() && 8499 CopyConstructor->isCopyConstructor() && 8500 !CopyConstructor->doesThisDeclarationHaveABody()) && 8501 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8502 8503 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8504 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8505 8506 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8507 DiagnosticErrorTrap Trap(Diags); 8508 8509 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8510 Trap.hasErrorOccurred()) { 8511 Diag(CurrentLocation, diag::note_member_synthesized_at) 8512 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8513 CopyConstructor->setInvalidDecl(); 8514 } else { 8515 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8516 CopyConstructor->getLocation(), 8517 MultiStmtArg(*this, 0, 0), 8518 /*isStmtExpr=*/false) 8519 .takeAs<Stmt>()); 8520 CopyConstructor->setImplicitlyDefined(true); 8521 } 8522 8523 CopyConstructor->setUsed(); 8524 if (ASTMutationListener *L = getASTMutationListener()) { 8525 L->CompletedImplicitDefinition(CopyConstructor); 8526 } 8527} 8528 8529Sema::ImplicitExceptionSpecification 8530Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8531 // C++ [except.spec]p14: 8532 // An implicitly declared special member function (Clause 12) shall have an 8533 // exception-specification. [...] 8534 ImplicitExceptionSpecification ExceptSpec(Context); 8535 if (ClassDecl->isInvalidDecl()) 8536 return ExceptSpec; 8537 8538 // Direct base-class constructors. 8539 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8540 BEnd = ClassDecl->bases_end(); 8541 B != BEnd; ++B) { 8542 if (B->isVirtual()) // Handled below. 8543 continue; 8544 8545 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8546 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8547 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8548 // If this is a deleted function, add it anyway. This might be conformant 8549 // with the standard. This might not. I'm not sure. It might not matter. 8550 if (Constructor) 8551 ExceptSpec.CalledDecl(Constructor); 8552 } 8553 } 8554 8555 // Virtual base-class constructors. 8556 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8557 BEnd = ClassDecl->vbases_end(); 8558 B != BEnd; ++B) { 8559 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8560 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8561 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8562 // If this is a deleted function, add it anyway. This might be conformant 8563 // with the standard. This might not. I'm not sure. It might not matter. 8564 if (Constructor) 8565 ExceptSpec.CalledDecl(Constructor); 8566 } 8567 } 8568 8569 // Field constructors. 8570 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8571 FEnd = ClassDecl->field_end(); 8572 F != FEnd; ++F) { 8573 if (F->hasInClassInitializer()) { 8574 if (Expr *E = F->getInClassInitializer()) 8575 ExceptSpec.CalledExpr(E); 8576 else if (!F->isInvalidDecl()) 8577 ExceptSpec.SetDelayed(); 8578 } else if (const RecordType *RecordTy 8579 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8580 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8581 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8582 // If this is a deleted function, add it anyway. This might be conformant 8583 // with the standard. This might not. I'm not sure. It might not matter. 8584 // In particular, the problem is that this function never gets called. It 8585 // might just be ill-formed because this function attempts to refer to 8586 // a deleted function here. 8587 if (Constructor) 8588 ExceptSpec.CalledDecl(Constructor); 8589 } 8590 } 8591 8592 return ExceptSpec; 8593} 8594 8595CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8596 CXXRecordDecl *ClassDecl) { 8597 ImplicitExceptionSpecification Spec( 8598 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8599 8600 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8601 QualType ArgType = Context.getRValueReferenceType(ClassType); 8602 8603 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8604 8605 DeclarationName Name 8606 = Context.DeclarationNames.getCXXConstructorName( 8607 Context.getCanonicalType(ClassType)); 8608 SourceLocation ClassLoc = ClassDecl->getLocation(); 8609 DeclarationNameInfo NameInfo(Name, ClassLoc); 8610 8611 // C++0x [class.copy]p11: 8612 // An implicitly-declared copy/move constructor is an inline public 8613 // member of its class. 8614 CXXConstructorDecl *MoveConstructor 8615 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8616 Context.getFunctionType(Context.VoidTy, 8617 &ArgType, 1, EPI), 8618 /*TInfo=*/0, 8619 /*isExplicit=*/false, 8620 /*isInline=*/true, 8621 /*isImplicitlyDeclared=*/true, 8622 // FIXME: apply the rules for definitions here 8623 /*isConstexpr=*/false); 8624 MoveConstructor->setAccess(AS_public); 8625 MoveConstructor->setDefaulted(); 8626 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8627 8628 // Add the parameter to the constructor. 8629 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8630 ClassLoc, ClassLoc, 8631 /*IdentifierInfo=*/0, 8632 ArgType, /*TInfo=*/0, 8633 SC_None, 8634 SC_None, 0); 8635 MoveConstructor->setParams(FromParam); 8636 8637 // C++0x [class.copy]p9: 8638 // If the definition of a class X does not explicitly declare a move 8639 // constructor, one will be implicitly declared as defaulted if and only if: 8640 // [...] 8641 // - the move constructor would not be implicitly defined as deleted. 8642 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8643 // Cache this result so that we don't try to generate this over and over 8644 // on every lookup, leaking memory and wasting time. 8645 ClassDecl->setFailedImplicitMoveConstructor(); 8646 return 0; 8647 } 8648 8649 // Note that we have declared this constructor. 8650 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8651 8652 if (Scope *S = getScopeForContext(ClassDecl)) 8653 PushOnScopeChains(MoveConstructor, S, false); 8654 ClassDecl->addDecl(MoveConstructor); 8655 8656 return MoveConstructor; 8657} 8658 8659void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8660 CXXConstructorDecl *MoveConstructor) { 8661 assert((MoveConstructor->isDefaulted() && 8662 MoveConstructor->isMoveConstructor() && 8663 !MoveConstructor->doesThisDeclarationHaveABody()) && 8664 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8665 8666 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8667 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8668 8669 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8670 DiagnosticErrorTrap Trap(Diags); 8671 8672 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8673 Trap.hasErrorOccurred()) { 8674 Diag(CurrentLocation, diag::note_member_synthesized_at) 8675 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8676 MoveConstructor->setInvalidDecl(); 8677 } else { 8678 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8679 MoveConstructor->getLocation(), 8680 MultiStmtArg(*this, 0, 0), 8681 /*isStmtExpr=*/false) 8682 .takeAs<Stmt>()); 8683 MoveConstructor->setImplicitlyDefined(true); 8684 } 8685 8686 MoveConstructor->setUsed(); 8687 8688 if (ASTMutationListener *L = getASTMutationListener()) { 8689 L->CompletedImplicitDefinition(MoveConstructor); 8690 } 8691} 8692 8693ExprResult 8694Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8695 CXXConstructorDecl *Constructor, 8696 MultiExprArg ExprArgs, 8697 bool HadMultipleCandidates, 8698 bool RequiresZeroInit, 8699 unsigned ConstructKind, 8700 SourceRange ParenRange) { 8701 bool Elidable = false; 8702 8703 // C++0x [class.copy]p34: 8704 // When certain criteria are met, an implementation is allowed to 8705 // omit the copy/move construction of a class object, even if the 8706 // copy/move constructor and/or destructor for the object have 8707 // side effects. [...] 8708 // - when a temporary class object that has not been bound to a 8709 // reference (12.2) would be copied/moved to a class object 8710 // with the same cv-unqualified type, the copy/move operation 8711 // can be omitted by constructing the temporary object 8712 // directly into the target of the omitted copy/move 8713 if (ConstructKind == CXXConstructExpr::CK_Complete && 8714 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8715 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8716 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8717 } 8718 8719 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8720 Elidable, move(ExprArgs), HadMultipleCandidates, 8721 RequiresZeroInit, ConstructKind, ParenRange); 8722} 8723 8724/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8725/// including handling of its default argument expressions. 8726ExprResult 8727Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8728 CXXConstructorDecl *Constructor, bool Elidable, 8729 MultiExprArg ExprArgs, 8730 bool HadMultipleCandidates, 8731 bool RequiresZeroInit, 8732 unsigned ConstructKind, 8733 SourceRange ParenRange) { 8734 unsigned NumExprs = ExprArgs.size(); 8735 Expr **Exprs = (Expr **)ExprArgs.release(); 8736 8737 for (specific_attr_iterator<NonNullAttr> 8738 i = Constructor->specific_attr_begin<NonNullAttr>(), 8739 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8740 const NonNullAttr *NonNull = *i; 8741 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8742 } 8743 8744 MarkDeclarationReferenced(ConstructLoc, Constructor); 8745 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8746 Constructor, Elidable, Exprs, NumExprs, 8747 HadMultipleCandidates, RequiresZeroInit, 8748 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8749 ParenRange)); 8750} 8751 8752bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8753 CXXConstructorDecl *Constructor, 8754 MultiExprArg Exprs, 8755 bool HadMultipleCandidates) { 8756 // FIXME: Provide the correct paren SourceRange when available. 8757 ExprResult TempResult = 8758 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8759 move(Exprs), HadMultipleCandidates, false, 8760 CXXConstructExpr::CK_Complete, SourceRange()); 8761 if (TempResult.isInvalid()) 8762 return true; 8763 8764 Expr *Temp = TempResult.takeAs<Expr>(); 8765 CheckImplicitConversions(Temp, VD->getLocation()); 8766 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8767 Temp = MaybeCreateExprWithCleanups(Temp); 8768 VD->setInit(Temp); 8769 8770 return false; 8771} 8772 8773void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8774 if (VD->isInvalidDecl()) return; 8775 8776 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8777 if (ClassDecl->isInvalidDecl()) return; 8778 if (ClassDecl->hasTrivialDestructor()) return; 8779 if (ClassDecl->isDependentContext()) return; 8780 8781 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8782 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8783 CheckDestructorAccess(VD->getLocation(), Destructor, 8784 PDiag(diag::err_access_dtor_var) 8785 << VD->getDeclName() 8786 << VD->getType()); 8787 8788 if (!VD->hasGlobalStorage()) return; 8789 8790 // Emit warning for non-trivial dtor in global scope (a real global, 8791 // class-static, function-static). 8792 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8793 8794 // TODO: this should be re-enabled for static locals by !CXAAtExit 8795 if (!VD->isStaticLocal()) 8796 Diag(VD->getLocation(), diag::warn_global_destructor); 8797} 8798 8799/// AddCXXDirectInitializerToDecl - This action is called immediately after 8800/// ActOnDeclarator, when a C++ direct initializer is present. 8801/// e.g: "int x(1);" 8802void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8803 SourceLocation LParenLoc, 8804 MultiExprArg Exprs, 8805 SourceLocation RParenLoc, 8806 bool TypeMayContainAuto) { 8807 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8808 8809 // If there is no declaration, there was an error parsing it. Just ignore 8810 // the initializer. 8811 if (RealDecl == 0) 8812 return; 8813 8814 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8815 if (!VDecl) { 8816 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8817 RealDecl->setInvalidDecl(); 8818 return; 8819 } 8820 8821 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8822 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8823 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8824 if (Exprs.size() > 1) { 8825 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8826 diag::err_auto_var_init_multiple_expressions) 8827 << VDecl->getDeclName() << VDecl->getType() 8828 << VDecl->getSourceRange(); 8829 RealDecl->setInvalidDecl(); 8830 return; 8831 } 8832 8833 Expr *Init = Exprs.get()[0]; 8834 TypeSourceInfo *DeducedType = 0; 8835 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8836 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8837 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8838 << Init->getSourceRange(); 8839 if (!DeducedType) { 8840 RealDecl->setInvalidDecl(); 8841 return; 8842 } 8843 VDecl->setTypeSourceInfo(DeducedType); 8844 VDecl->setType(DeducedType->getType()); 8845 8846 // In ARC, infer lifetime. 8847 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8848 VDecl->setInvalidDecl(); 8849 8850 // If this is a redeclaration, check that the type we just deduced matches 8851 // the previously declared type. 8852 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8853 MergeVarDeclTypes(VDecl, Old); 8854 } 8855 8856 // We will represent direct-initialization similarly to copy-initialization: 8857 // int x(1); -as-> int x = 1; 8858 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8859 // 8860 // Clients that want to distinguish between the two forms, can check for 8861 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8862 // A major benefit is that clients that don't particularly care about which 8863 // exactly form was it (like the CodeGen) can handle both cases without 8864 // special case code. 8865 8866 // C++ 8.5p11: 8867 // The form of initialization (using parentheses or '=') is generally 8868 // insignificant, but does matter when the entity being initialized has a 8869 // class type. 8870 8871 if (!VDecl->getType()->isDependentType() && 8872 !VDecl->getType()->isIncompleteArrayType() && 8873 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8874 diag::err_typecheck_decl_incomplete_type)) { 8875 VDecl->setInvalidDecl(); 8876 return; 8877 } 8878 8879 // The variable can not have an abstract class type. 8880 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8881 diag::err_abstract_type_in_decl, 8882 AbstractVariableType)) 8883 VDecl->setInvalidDecl(); 8884 8885 const VarDecl *Def; 8886 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8887 Diag(VDecl->getLocation(), diag::err_redefinition) 8888 << VDecl->getDeclName(); 8889 Diag(Def->getLocation(), diag::note_previous_definition); 8890 VDecl->setInvalidDecl(); 8891 return; 8892 } 8893 8894 // C++ [class.static.data]p4 8895 // If a static data member is of const integral or const 8896 // enumeration type, its declaration in the class definition can 8897 // specify a constant-initializer which shall be an integral 8898 // constant expression (5.19). In that case, the member can appear 8899 // in integral constant expressions. The member shall still be 8900 // defined in a namespace scope if it is used in the program and the 8901 // namespace scope definition shall not contain an initializer. 8902 // 8903 // We already performed a redefinition check above, but for static 8904 // data members we also need to check whether there was an in-class 8905 // declaration with an initializer. 8906 const VarDecl* PrevInit = 0; 8907 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8908 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8909 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8910 return; 8911 } 8912 8913 bool IsDependent = false; 8914 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8915 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8916 VDecl->setInvalidDecl(); 8917 return; 8918 } 8919 8920 if (Exprs.get()[I]->isTypeDependent()) 8921 IsDependent = true; 8922 } 8923 8924 // If either the declaration has a dependent type or if any of the 8925 // expressions is type-dependent, we represent the initialization 8926 // via a ParenListExpr for later use during template instantiation. 8927 if (VDecl->getType()->isDependentType() || IsDependent) { 8928 // Let clients know that initialization was done with a direct initializer. 8929 VDecl->setCXXDirectInitializer(true); 8930 8931 // Store the initialization expressions as a ParenListExpr. 8932 unsigned NumExprs = Exprs.size(); 8933 VDecl->setInit(new (Context) ParenListExpr( 8934 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8935 VDecl->getType().getNonReferenceType())); 8936 return; 8937 } 8938 8939 // Capture the variable that is being initialized and the style of 8940 // initialization. 8941 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8942 8943 // FIXME: Poor source location information. 8944 InitializationKind Kind 8945 = InitializationKind::CreateDirect(VDecl->getLocation(), 8946 LParenLoc, RParenLoc); 8947 8948 QualType T = VDecl->getType(); 8949 InitializationSequence InitSeq(*this, Entity, Kind, 8950 Exprs.get(), Exprs.size()); 8951 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8952 if (Result.isInvalid()) { 8953 VDecl->setInvalidDecl(); 8954 return; 8955 } else if (T != VDecl->getType()) { 8956 VDecl->setType(T); 8957 Result.get()->setType(T); 8958 } 8959 8960 8961 Expr *Init = Result.get(); 8962 CheckImplicitConversions(Init, LParenLoc); 8963 8964 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 8965 !Init->isValueDependent() && 8966 !Init->isConstantInitializer(Context, 8967 VDecl->getType()->isReferenceType())) { 8968 // FIXME: Improve this diagnostic to explain why the initializer is not 8969 // a constant expression. 8970 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 8971 << VDecl << Init->getSourceRange(); 8972 } 8973 8974 Init = MaybeCreateExprWithCleanups(Init); 8975 VDecl->setInit(Init); 8976 VDecl->setCXXDirectInitializer(true); 8977 8978 CheckCompleteVariableDeclaration(VDecl); 8979} 8980 8981/// \brief Given a constructor and the set of arguments provided for the 8982/// constructor, convert the arguments and add any required default arguments 8983/// to form a proper call to this constructor. 8984/// 8985/// \returns true if an error occurred, false otherwise. 8986bool 8987Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8988 MultiExprArg ArgsPtr, 8989 SourceLocation Loc, 8990 ASTOwningVector<Expr*> &ConvertedArgs) { 8991 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8992 unsigned NumArgs = ArgsPtr.size(); 8993 Expr **Args = (Expr **)ArgsPtr.get(); 8994 8995 const FunctionProtoType *Proto 8996 = Constructor->getType()->getAs<FunctionProtoType>(); 8997 assert(Proto && "Constructor without a prototype?"); 8998 unsigned NumArgsInProto = Proto->getNumArgs(); 8999 9000 // If too few arguments are available, we'll fill in the rest with defaults. 9001 if (NumArgs < NumArgsInProto) 9002 ConvertedArgs.reserve(NumArgsInProto); 9003 else 9004 ConvertedArgs.reserve(NumArgs); 9005 9006 VariadicCallType CallType = 9007 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9008 SmallVector<Expr *, 8> AllArgs; 9009 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9010 Proto, 0, Args, NumArgs, AllArgs, 9011 CallType); 9012 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9013 ConvertedArgs.push_back(AllArgs[i]); 9014 return Invalid; 9015} 9016 9017static inline bool 9018CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9019 const FunctionDecl *FnDecl) { 9020 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9021 if (isa<NamespaceDecl>(DC)) { 9022 return SemaRef.Diag(FnDecl->getLocation(), 9023 diag::err_operator_new_delete_declared_in_namespace) 9024 << FnDecl->getDeclName(); 9025 } 9026 9027 if (isa<TranslationUnitDecl>(DC) && 9028 FnDecl->getStorageClass() == SC_Static) { 9029 return SemaRef.Diag(FnDecl->getLocation(), 9030 diag::err_operator_new_delete_declared_static) 9031 << FnDecl->getDeclName(); 9032 } 9033 9034 return false; 9035} 9036 9037static inline bool 9038CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9039 CanQualType ExpectedResultType, 9040 CanQualType ExpectedFirstParamType, 9041 unsigned DependentParamTypeDiag, 9042 unsigned InvalidParamTypeDiag) { 9043 QualType ResultType = 9044 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9045 9046 // Check that the result type is not dependent. 9047 if (ResultType->isDependentType()) 9048 return SemaRef.Diag(FnDecl->getLocation(), 9049 diag::err_operator_new_delete_dependent_result_type) 9050 << FnDecl->getDeclName() << ExpectedResultType; 9051 9052 // Check that the result type is what we expect. 9053 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9054 return SemaRef.Diag(FnDecl->getLocation(), 9055 diag::err_operator_new_delete_invalid_result_type) 9056 << FnDecl->getDeclName() << ExpectedResultType; 9057 9058 // A function template must have at least 2 parameters. 9059 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9060 return SemaRef.Diag(FnDecl->getLocation(), 9061 diag::err_operator_new_delete_template_too_few_parameters) 9062 << FnDecl->getDeclName(); 9063 9064 // The function decl must have at least 1 parameter. 9065 if (FnDecl->getNumParams() == 0) 9066 return SemaRef.Diag(FnDecl->getLocation(), 9067 diag::err_operator_new_delete_too_few_parameters) 9068 << FnDecl->getDeclName(); 9069 9070 // Check the the first parameter type is not dependent. 9071 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9072 if (FirstParamType->isDependentType()) 9073 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9074 << FnDecl->getDeclName() << ExpectedFirstParamType; 9075 9076 // Check that the first parameter type is what we expect. 9077 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9078 ExpectedFirstParamType) 9079 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9080 << FnDecl->getDeclName() << ExpectedFirstParamType; 9081 9082 return false; 9083} 9084 9085static bool 9086CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9087 // C++ [basic.stc.dynamic.allocation]p1: 9088 // A program is ill-formed if an allocation function is declared in a 9089 // namespace scope other than global scope or declared static in global 9090 // scope. 9091 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9092 return true; 9093 9094 CanQualType SizeTy = 9095 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9096 9097 // C++ [basic.stc.dynamic.allocation]p1: 9098 // The return type shall be void*. The first parameter shall have type 9099 // std::size_t. 9100 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9101 SizeTy, 9102 diag::err_operator_new_dependent_param_type, 9103 diag::err_operator_new_param_type)) 9104 return true; 9105 9106 // C++ [basic.stc.dynamic.allocation]p1: 9107 // The first parameter shall not have an associated default argument. 9108 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9109 return SemaRef.Diag(FnDecl->getLocation(), 9110 diag::err_operator_new_default_arg) 9111 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9112 9113 return false; 9114} 9115 9116static bool 9117CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9118 // C++ [basic.stc.dynamic.deallocation]p1: 9119 // A program is ill-formed if deallocation functions are declared in a 9120 // namespace scope other than global scope or declared static in global 9121 // scope. 9122 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9123 return true; 9124 9125 // C++ [basic.stc.dynamic.deallocation]p2: 9126 // Each deallocation function shall return void and its first parameter 9127 // shall be void*. 9128 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9129 SemaRef.Context.VoidPtrTy, 9130 diag::err_operator_delete_dependent_param_type, 9131 diag::err_operator_delete_param_type)) 9132 return true; 9133 9134 return false; 9135} 9136 9137/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9138/// of this overloaded operator is well-formed. If so, returns false; 9139/// otherwise, emits appropriate diagnostics and returns true. 9140bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9141 assert(FnDecl && FnDecl->isOverloadedOperator() && 9142 "Expected an overloaded operator declaration"); 9143 9144 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9145 9146 // C++ [over.oper]p5: 9147 // The allocation and deallocation functions, operator new, 9148 // operator new[], operator delete and operator delete[], are 9149 // described completely in 3.7.3. The attributes and restrictions 9150 // found in the rest of this subclause do not apply to them unless 9151 // explicitly stated in 3.7.3. 9152 if (Op == OO_Delete || Op == OO_Array_Delete) 9153 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9154 9155 if (Op == OO_New || Op == OO_Array_New) 9156 return CheckOperatorNewDeclaration(*this, FnDecl); 9157 9158 // C++ [over.oper]p6: 9159 // An operator function shall either be a non-static member 9160 // function or be a non-member function and have at least one 9161 // parameter whose type is a class, a reference to a class, an 9162 // enumeration, or a reference to an enumeration. 9163 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9164 if (MethodDecl->isStatic()) 9165 return Diag(FnDecl->getLocation(), 9166 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9167 } else { 9168 bool ClassOrEnumParam = false; 9169 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9170 ParamEnd = FnDecl->param_end(); 9171 Param != ParamEnd; ++Param) { 9172 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9173 if (ParamType->isDependentType() || ParamType->isRecordType() || 9174 ParamType->isEnumeralType()) { 9175 ClassOrEnumParam = true; 9176 break; 9177 } 9178 } 9179 9180 if (!ClassOrEnumParam) 9181 return Diag(FnDecl->getLocation(), 9182 diag::err_operator_overload_needs_class_or_enum) 9183 << FnDecl->getDeclName(); 9184 } 9185 9186 // C++ [over.oper]p8: 9187 // An operator function cannot have default arguments (8.3.6), 9188 // except where explicitly stated below. 9189 // 9190 // Only the function-call operator allows default arguments 9191 // (C++ [over.call]p1). 9192 if (Op != OO_Call) { 9193 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9194 Param != FnDecl->param_end(); ++Param) { 9195 if ((*Param)->hasDefaultArg()) 9196 return Diag((*Param)->getLocation(), 9197 diag::err_operator_overload_default_arg) 9198 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9199 } 9200 } 9201 9202 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9203 { false, false, false } 9204#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9205 , { Unary, Binary, MemberOnly } 9206#include "clang/Basic/OperatorKinds.def" 9207 }; 9208 9209 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9210 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9211 bool MustBeMemberOperator = OperatorUses[Op][2]; 9212 9213 // C++ [over.oper]p8: 9214 // [...] Operator functions cannot have more or fewer parameters 9215 // than the number required for the corresponding operator, as 9216 // described in the rest of this subclause. 9217 unsigned NumParams = FnDecl->getNumParams() 9218 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9219 if (Op != OO_Call && 9220 ((NumParams == 1 && !CanBeUnaryOperator) || 9221 (NumParams == 2 && !CanBeBinaryOperator) || 9222 (NumParams < 1) || (NumParams > 2))) { 9223 // We have the wrong number of parameters. 9224 unsigned ErrorKind; 9225 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9226 ErrorKind = 2; // 2 -> unary or binary. 9227 } else if (CanBeUnaryOperator) { 9228 ErrorKind = 0; // 0 -> unary 9229 } else { 9230 assert(CanBeBinaryOperator && 9231 "All non-call overloaded operators are unary or binary!"); 9232 ErrorKind = 1; // 1 -> binary 9233 } 9234 9235 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9236 << FnDecl->getDeclName() << NumParams << ErrorKind; 9237 } 9238 9239 // Overloaded operators other than operator() cannot be variadic. 9240 if (Op != OO_Call && 9241 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9242 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9243 << FnDecl->getDeclName(); 9244 } 9245 9246 // Some operators must be non-static member functions. 9247 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9248 return Diag(FnDecl->getLocation(), 9249 diag::err_operator_overload_must_be_member) 9250 << FnDecl->getDeclName(); 9251 } 9252 9253 // C++ [over.inc]p1: 9254 // The user-defined function called operator++ implements the 9255 // prefix and postfix ++ operator. If this function is a member 9256 // function with no parameters, or a non-member function with one 9257 // parameter of class or enumeration type, it defines the prefix 9258 // increment operator ++ for objects of that type. If the function 9259 // is a member function with one parameter (which shall be of type 9260 // int) or a non-member function with two parameters (the second 9261 // of which shall be of type int), it defines the postfix 9262 // increment operator ++ for objects of that type. 9263 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9264 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9265 bool ParamIsInt = false; 9266 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9267 ParamIsInt = BT->getKind() == BuiltinType::Int; 9268 9269 if (!ParamIsInt) 9270 return Diag(LastParam->getLocation(), 9271 diag::err_operator_overload_post_incdec_must_be_int) 9272 << LastParam->getType() << (Op == OO_MinusMinus); 9273 } 9274 9275 return false; 9276} 9277 9278/// CheckLiteralOperatorDeclaration - Check whether the declaration 9279/// of this literal operator function is well-formed. If so, returns 9280/// false; otherwise, emits appropriate diagnostics and returns true. 9281bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9282 DeclContext *DC = FnDecl->getDeclContext(); 9283 Decl::Kind Kind = DC->getDeclKind(); 9284 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9285 Kind != Decl::LinkageSpec) { 9286 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9287 << FnDecl->getDeclName(); 9288 return true; 9289 } 9290 9291 bool Valid = false; 9292 9293 // template <char...> type operator "" name() is the only valid template 9294 // signature, and the only valid signature with no parameters. 9295 if (FnDecl->param_size() == 0) { 9296 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9297 // Must have only one template parameter 9298 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9299 if (Params->size() == 1) { 9300 NonTypeTemplateParmDecl *PmDecl = 9301 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9302 9303 // The template parameter must be a char parameter pack. 9304 if (PmDecl && PmDecl->isTemplateParameterPack() && 9305 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9306 Valid = true; 9307 } 9308 } 9309 } else { 9310 // Check the first parameter 9311 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9312 9313 QualType T = (*Param)->getType(); 9314 9315 // unsigned long long int, long double, and any character type are allowed 9316 // as the only parameters. 9317 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9318 Context.hasSameType(T, Context.LongDoubleTy) || 9319 Context.hasSameType(T, Context.CharTy) || 9320 Context.hasSameType(T, Context.WCharTy) || 9321 Context.hasSameType(T, Context.Char16Ty) || 9322 Context.hasSameType(T, Context.Char32Ty)) { 9323 if (++Param == FnDecl->param_end()) 9324 Valid = true; 9325 goto FinishedParams; 9326 } 9327 9328 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9329 const PointerType *PT = T->getAs<PointerType>(); 9330 if (!PT) 9331 goto FinishedParams; 9332 T = PT->getPointeeType(); 9333 if (!T.isConstQualified()) 9334 goto FinishedParams; 9335 T = T.getUnqualifiedType(); 9336 9337 // Move on to the second parameter; 9338 ++Param; 9339 9340 // If there is no second parameter, the first must be a const char * 9341 if (Param == FnDecl->param_end()) { 9342 if (Context.hasSameType(T, Context.CharTy)) 9343 Valid = true; 9344 goto FinishedParams; 9345 } 9346 9347 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9348 // are allowed as the first parameter to a two-parameter function 9349 if (!(Context.hasSameType(T, Context.CharTy) || 9350 Context.hasSameType(T, Context.WCharTy) || 9351 Context.hasSameType(T, Context.Char16Ty) || 9352 Context.hasSameType(T, Context.Char32Ty))) 9353 goto FinishedParams; 9354 9355 // The second and final parameter must be an std::size_t 9356 T = (*Param)->getType().getUnqualifiedType(); 9357 if (Context.hasSameType(T, Context.getSizeType()) && 9358 ++Param == FnDecl->param_end()) 9359 Valid = true; 9360 } 9361 9362 // FIXME: This diagnostic is absolutely terrible. 9363FinishedParams: 9364 if (!Valid) { 9365 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9366 << FnDecl->getDeclName(); 9367 return true; 9368 } 9369 9370 StringRef LiteralName 9371 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9372 if (LiteralName[0] != '_') { 9373 // C++0x [usrlit.suffix]p1: 9374 // Literal suffix identifiers that do not start with an underscore are 9375 // reserved for future standardization. 9376 bool IsHexFloat = true; 9377 if (LiteralName.size() > 1 && 9378 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9379 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9380 if (!isdigit(LiteralName[I])) { 9381 IsHexFloat = false; 9382 break; 9383 } 9384 } 9385 } 9386 9387 if (IsHexFloat) 9388 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9389 << LiteralName; 9390 else 9391 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9392 } 9393 9394 return false; 9395} 9396 9397/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9398/// linkage specification, including the language and (if present) 9399/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9400/// the location of the language string literal, which is provided 9401/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9402/// the '{' brace. Otherwise, this linkage specification does not 9403/// have any braces. 9404Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9405 SourceLocation LangLoc, 9406 StringRef Lang, 9407 SourceLocation LBraceLoc) { 9408 LinkageSpecDecl::LanguageIDs Language; 9409 if (Lang == "\"C\"") 9410 Language = LinkageSpecDecl::lang_c; 9411 else if (Lang == "\"C++\"") 9412 Language = LinkageSpecDecl::lang_cxx; 9413 else { 9414 Diag(LangLoc, diag::err_bad_language); 9415 return 0; 9416 } 9417 9418 // FIXME: Add all the various semantics of linkage specifications 9419 9420 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9421 ExternLoc, LangLoc, Language); 9422 CurContext->addDecl(D); 9423 PushDeclContext(S, D); 9424 return D; 9425} 9426 9427/// ActOnFinishLinkageSpecification - Complete the definition of 9428/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9429/// valid, it's the position of the closing '}' brace in a linkage 9430/// specification that uses braces. 9431Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9432 Decl *LinkageSpec, 9433 SourceLocation RBraceLoc) { 9434 if (LinkageSpec) { 9435 if (RBraceLoc.isValid()) { 9436 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9437 LSDecl->setRBraceLoc(RBraceLoc); 9438 } 9439 PopDeclContext(); 9440 } 9441 return LinkageSpec; 9442} 9443 9444/// \brief Perform semantic analysis for the variable declaration that 9445/// occurs within a C++ catch clause, returning the newly-created 9446/// variable. 9447VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9448 TypeSourceInfo *TInfo, 9449 SourceLocation StartLoc, 9450 SourceLocation Loc, 9451 IdentifierInfo *Name) { 9452 bool Invalid = false; 9453 QualType ExDeclType = TInfo->getType(); 9454 9455 // Arrays and functions decay. 9456 if (ExDeclType->isArrayType()) 9457 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9458 else if (ExDeclType->isFunctionType()) 9459 ExDeclType = Context.getPointerType(ExDeclType); 9460 9461 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9462 // The exception-declaration shall not denote a pointer or reference to an 9463 // incomplete type, other than [cv] void*. 9464 // N2844 forbids rvalue references. 9465 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9466 Diag(Loc, diag::err_catch_rvalue_ref); 9467 Invalid = true; 9468 } 9469 9470 // GCC allows catching pointers and references to incomplete types 9471 // as an extension; so do we, but we warn by default. 9472 9473 QualType BaseType = ExDeclType; 9474 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9475 unsigned DK = diag::err_catch_incomplete; 9476 bool IncompleteCatchIsInvalid = true; 9477 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9478 BaseType = Ptr->getPointeeType(); 9479 Mode = 1; 9480 DK = diag::ext_catch_incomplete_ptr; 9481 IncompleteCatchIsInvalid = false; 9482 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9483 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9484 BaseType = Ref->getPointeeType(); 9485 Mode = 2; 9486 DK = diag::ext_catch_incomplete_ref; 9487 IncompleteCatchIsInvalid = false; 9488 } 9489 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9490 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9491 IncompleteCatchIsInvalid) 9492 Invalid = true; 9493 9494 if (!Invalid && !ExDeclType->isDependentType() && 9495 RequireNonAbstractType(Loc, ExDeclType, 9496 diag::err_abstract_type_in_decl, 9497 AbstractVariableType)) 9498 Invalid = true; 9499 9500 // Only the non-fragile NeXT runtime currently supports C++ catches 9501 // of ObjC types, and no runtime supports catching ObjC types by value. 9502 if (!Invalid && getLangOptions().ObjC1) { 9503 QualType T = ExDeclType; 9504 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9505 T = RT->getPointeeType(); 9506 9507 if (T->isObjCObjectType()) { 9508 Diag(Loc, diag::err_objc_object_catch); 9509 Invalid = true; 9510 } else if (T->isObjCObjectPointerType()) { 9511 if (!getLangOptions().ObjCNonFragileABI) 9512 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9513 } 9514 } 9515 9516 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9517 ExDeclType, TInfo, SC_None, SC_None); 9518 ExDecl->setExceptionVariable(true); 9519 9520 if (!Invalid && !ExDeclType->isDependentType()) { 9521 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9522 // C++ [except.handle]p16: 9523 // The object declared in an exception-declaration or, if the 9524 // exception-declaration does not specify a name, a temporary (12.2) is 9525 // copy-initialized (8.5) from the exception object. [...] 9526 // The object is destroyed when the handler exits, after the destruction 9527 // of any automatic objects initialized within the handler. 9528 // 9529 // We just pretend to initialize the object with itself, then make sure 9530 // it can be destroyed later. 9531 QualType initType = ExDeclType; 9532 9533 InitializedEntity entity = 9534 InitializedEntity::InitializeVariable(ExDecl); 9535 InitializationKind initKind = 9536 InitializationKind::CreateCopy(Loc, SourceLocation()); 9537 9538 Expr *opaqueValue = 9539 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9540 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9541 ExprResult result = sequence.Perform(*this, entity, initKind, 9542 MultiExprArg(&opaqueValue, 1)); 9543 if (result.isInvalid()) 9544 Invalid = true; 9545 else { 9546 // If the constructor used was non-trivial, set this as the 9547 // "initializer". 9548 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9549 if (!construct->getConstructor()->isTrivial()) { 9550 Expr *init = MaybeCreateExprWithCleanups(construct); 9551 ExDecl->setInit(init); 9552 } 9553 9554 // And make sure it's destructable. 9555 FinalizeVarWithDestructor(ExDecl, recordType); 9556 } 9557 } 9558 } 9559 9560 if (Invalid) 9561 ExDecl->setInvalidDecl(); 9562 9563 return ExDecl; 9564} 9565 9566/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9567/// handler. 9568Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9569 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9570 bool Invalid = D.isInvalidType(); 9571 9572 // Check for unexpanded parameter packs. 9573 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9574 UPPC_ExceptionType)) { 9575 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9576 D.getIdentifierLoc()); 9577 Invalid = true; 9578 } 9579 9580 IdentifierInfo *II = D.getIdentifier(); 9581 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9582 LookupOrdinaryName, 9583 ForRedeclaration)) { 9584 // The scope should be freshly made just for us. There is just no way 9585 // it contains any previous declaration. 9586 assert(!S->isDeclScope(PrevDecl)); 9587 if (PrevDecl->isTemplateParameter()) { 9588 // Maybe we will complain about the shadowed template parameter. 9589 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9590 PrevDecl = 0; 9591 } 9592 } 9593 9594 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9595 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9596 << D.getCXXScopeSpec().getRange(); 9597 Invalid = true; 9598 } 9599 9600 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9601 D.getSourceRange().getBegin(), 9602 D.getIdentifierLoc(), 9603 D.getIdentifier()); 9604 if (Invalid) 9605 ExDecl->setInvalidDecl(); 9606 9607 // Add the exception declaration into this scope. 9608 if (II) 9609 PushOnScopeChains(ExDecl, S); 9610 else 9611 CurContext->addDecl(ExDecl); 9612 9613 ProcessDeclAttributes(S, ExDecl, D); 9614 return ExDecl; 9615} 9616 9617Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9618 Expr *AssertExpr, 9619 Expr *AssertMessageExpr_, 9620 SourceLocation RParenLoc) { 9621 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9622 9623 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9624 llvm::APSInt Value(32); 9625 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9626 Diag(StaticAssertLoc, 9627 diag::err_static_assert_expression_is_not_constant) << 9628 AssertExpr->getSourceRange(); 9629 return 0; 9630 } 9631 9632 if (Value == 0) { 9633 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9634 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9635 } 9636 } 9637 9638 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9639 return 0; 9640 9641 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9642 AssertExpr, AssertMessage, RParenLoc); 9643 9644 CurContext->addDecl(Decl); 9645 return Decl; 9646} 9647 9648/// \brief Perform semantic analysis of the given friend type declaration. 9649/// 9650/// \returns A friend declaration that. 9651FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9652 TypeSourceInfo *TSInfo) { 9653 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9654 9655 QualType T = TSInfo->getType(); 9656 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9657 9658 // C++03 [class.friend]p2: 9659 // An elaborated-type-specifier shall be used in a friend declaration 9660 // for a class.* 9661 // 9662 // * The class-key of the elaborated-type-specifier is required. 9663 if (!ActiveTemplateInstantiations.empty()) { 9664 // Do not complain about the form of friend template types during 9665 // template instantiation; we will already have complained when the 9666 // template was declared. 9667 } else if (!T->isElaboratedTypeSpecifier()) { 9668 // If we evaluated the type to a record type, suggest putting 9669 // a tag in front. 9670 if (const RecordType *RT = T->getAs<RecordType>()) { 9671 RecordDecl *RD = RT->getDecl(); 9672 9673 std::string InsertionText = std::string(" ") + RD->getKindName(); 9674 9675 Diag(TypeRange.getBegin(), 9676 getLangOptions().CPlusPlus0x ? 9677 diag::warn_cxx98_compat_unelaborated_friend_type : 9678 diag::ext_unelaborated_friend_type) 9679 << (unsigned) RD->getTagKind() 9680 << T 9681 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9682 InsertionText); 9683 } else { 9684 Diag(FriendLoc, 9685 getLangOptions().CPlusPlus0x ? 9686 diag::warn_cxx98_compat_nonclass_type_friend : 9687 diag::ext_nonclass_type_friend) 9688 << T 9689 << SourceRange(FriendLoc, TypeRange.getEnd()); 9690 } 9691 } else if (T->getAs<EnumType>()) { 9692 Diag(FriendLoc, 9693 getLangOptions().CPlusPlus0x ? 9694 diag::warn_cxx98_compat_enum_friend : 9695 diag::ext_enum_friend) 9696 << T 9697 << SourceRange(FriendLoc, TypeRange.getEnd()); 9698 } 9699 9700 // C++0x [class.friend]p3: 9701 // If the type specifier in a friend declaration designates a (possibly 9702 // cv-qualified) class type, that class is declared as a friend; otherwise, 9703 // the friend declaration is ignored. 9704 9705 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9706 // in [class.friend]p3 that we do not implement. 9707 9708 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9709} 9710 9711/// Handle a friend tag declaration where the scope specifier was 9712/// templated. 9713Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9714 unsigned TagSpec, SourceLocation TagLoc, 9715 CXXScopeSpec &SS, 9716 IdentifierInfo *Name, SourceLocation NameLoc, 9717 AttributeList *Attr, 9718 MultiTemplateParamsArg TempParamLists) { 9719 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9720 9721 bool isExplicitSpecialization = false; 9722 bool Invalid = false; 9723 9724 if (TemplateParameterList *TemplateParams 9725 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9726 TempParamLists.get(), 9727 TempParamLists.size(), 9728 /*friend*/ true, 9729 isExplicitSpecialization, 9730 Invalid)) { 9731 if (TemplateParams->size() > 0) { 9732 // This is a declaration of a class template. 9733 if (Invalid) 9734 return 0; 9735 9736 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9737 SS, Name, NameLoc, Attr, 9738 TemplateParams, AS_public, 9739 /*ModulePrivateLoc=*/SourceLocation(), 9740 TempParamLists.size() - 1, 9741 (TemplateParameterList**) TempParamLists.release()).take(); 9742 } else { 9743 // The "template<>" header is extraneous. 9744 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9745 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9746 isExplicitSpecialization = true; 9747 } 9748 } 9749 9750 if (Invalid) return 0; 9751 9752 bool isAllExplicitSpecializations = true; 9753 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9754 if (TempParamLists.get()[I]->size()) { 9755 isAllExplicitSpecializations = false; 9756 break; 9757 } 9758 } 9759 9760 // FIXME: don't ignore attributes. 9761 9762 // If it's explicit specializations all the way down, just forget 9763 // about the template header and build an appropriate non-templated 9764 // friend. TODO: for source fidelity, remember the headers. 9765 if (isAllExplicitSpecializations) { 9766 if (SS.isEmpty()) { 9767 bool Owned = false; 9768 bool IsDependent = false; 9769 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9770 Attr, AS_public, 9771 /*ModulePrivateLoc=*/SourceLocation(), 9772 MultiTemplateParamsArg(), Owned, IsDependent, 9773 /*ScopedEnum=*/false, 9774 /*ScopedEnumUsesClassTag=*/false, 9775 /*UnderlyingType=*/TypeResult()); 9776 } 9777 9778 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9779 ElaboratedTypeKeyword Keyword 9780 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9781 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9782 *Name, NameLoc); 9783 if (T.isNull()) 9784 return 0; 9785 9786 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9787 if (isa<DependentNameType>(T)) { 9788 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9789 TL.setKeywordLoc(TagLoc); 9790 TL.setQualifierLoc(QualifierLoc); 9791 TL.setNameLoc(NameLoc); 9792 } else { 9793 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9794 TL.setKeywordLoc(TagLoc); 9795 TL.setQualifierLoc(QualifierLoc); 9796 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9797 } 9798 9799 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9800 TSI, FriendLoc); 9801 Friend->setAccess(AS_public); 9802 CurContext->addDecl(Friend); 9803 return Friend; 9804 } 9805 9806 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9807 9808 9809 9810 // Handle the case of a templated-scope friend class. e.g. 9811 // template <class T> class A<T>::B; 9812 // FIXME: we don't support these right now. 9813 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9814 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9815 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9816 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9817 TL.setKeywordLoc(TagLoc); 9818 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9819 TL.setNameLoc(NameLoc); 9820 9821 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9822 TSI, FriendLoc); 9823 Friend->setAccess(AS_public); 9824 Friend->setUnsupportedFriend(true); 9825 CurContext->addDecl(Friend); 9826 return Friend; 9827} 9828 9829 9830/// Handle a friend type declaration. This works in tandem with 9831/// ActOnTag. 9832/// 9833/// Notes on friend class templates: 9834/// 9835/// We generally treat friend class declarations as if they were 9836/// declaring a class. So, for example, the elaborated type specifier 9837/// in a friend declaration is required to obey the restrictions of a 9838/// class-head (i.e. no typedefs in the scope chain), template 9839/// parameters are required to match up with simple template-ids, &c. 9840/// However, unlike when declaring a template specialization, it's 9841/// okay to refer to a template specialization without an empty 9842/// template parameter declaration, e.g. 9843/// friend class A<T>::B<unsigned>; 9844/// We permit this as a special case; if there are any template 9845/// parameters present at all, require proper matching, i.e. 9846/// template <> template <class T> friend class A<int>::B; 9847Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9848 MultiTemplateParamsArg TempParams) { 9849 SourceLocation Loc = DS.getSourceRange().getBegin(); 9850 9851 assert(DS.isFriendSpecified()); 9852 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9853 9854 // Try to convert the decl specifier to a type. This works for 9855 // friend templates because ActOnTag never produces a ClassTemplateDecl 9856 // for a TUK_Friend. 9857 Declarator TheDeclarator(DS, Declarator::MemberContext); 9858 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9859 QualType T = TSI->getType(); 9860 if (TheDeclarator.isInvalidType()) 9861 return 0; 9862 9863 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9864 return 0; 9865 9866 // This is definitely an error in C++98. It's probably meant to 9867 // be forbidden in C++0x, too, but the specification is just 9868 // poorly written. 9869 // 9870 // The problem is with declarations like the following: 9871 // template <T> friend A<T>::foo; 9872 // where deciding whether a class C is a friend or not now hinges 9873 // on whether there exists an instantiation of A that causes 9874 // 'foo' to equal C. There are restrictions on class-heads 9875 // (which we declare (by fiat) elaborated friend declarations to 9876 // be) that makes this tractable. 9877 // 9878 // FIXME: handle "template <> friend class A<T>;", which 9879 // is possibly well-formed? Who even knows? 9880 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9881 Diag(Loc, diag::err_tagless_friend_type_template) 9882 << DS.getSourceRange(); 9883 return 0; 9884 } 9885 9886 // C++98 [class.friend]p1: A friend of a class is a function 9887 // or class that is not a member of the class . . . 9888 // This is fixed in DR77, which just barely didn't make the C++03 9889 // deadline. It's also a very silly restriction that seriously 9890 // affects inner classes and which nobody else seems to implement; 9891 // thus we never diagnose it, not even in -pedantic. 9892 // 9893 // But note that we could warn about it: it's always useless to 9894 // friend one of your own members (it's not, however, worthless to 9895 // friend a member of an arbitrary specialization of your template). 9896 9897 Decl *D; 9898 if (unsigned NumTempParamLists = TempParams.size()) 9899 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9900 NumTempParamLists, 9901 TempParams.release(), 9902 TSI, 9903 DS.getFriendSpecLoc()); 9904 else 9905 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9906 9907 if (!D) 9908 return 0; 9909 9910 D->setAccess(AS_public); 9911 CurContext->addDecl(D); 9912 9913 return D; 9914} 9915 9916Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9917 MultiTemplateParamsArg TemplateParams) { 9918 const DeclSpec &DS = D.getDeclSpec(); 9919 9920 assert(DS.isFriendSpecified()); 9921 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9922 9923 SourceLocation Loc = D.getIdentifierLoc(); 9924 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9925 9926 // C++ [class.friend]p1 9927 // A friend of a class is a function or class.... 9928 // Note that this sees through typedefs, which is intended. 9929 // It *doesn't* see through dependent types, which is correct 9930 // according to [temp.arg.type]p3: 9931 // If a declaration acquires a function type through a 9932 // type dependent on a template-parameter and this causes 9933 // a declaration that does not use the syntactic form of a 9934 // function declarator to have a function type, the program 9935 // is ill-formed. 9936 if (!TInfo->getType()->isFunctionType()) { 9937 Diag(Loc, diag::err_unexpected_friend); 9938 9939 // It might be worthwhile to try to recover by creating an 9940 // appropriate declaration. 9941 return 0; 9942 } 9943 9944 // C++ [namespace.memdef]p3 9945 // - If a friend declaration in a non-local class first declares a 9946 // class or function, the friend class or function is a member 9947 // of the innermost enclosing namespace. 9948 // - The name of the friend is not found by simple name lookup 9949 // until a matching declaration is provided in that namespace 9950 // scope (either before or after the class declaration granting 9951 // friendship). 9952 // - If a friend function is called, its name may be found by the 9953 // name lookup that considers functions from namespaces and 9954 // classes associated with the types of the function arguments. 9955 // - When looking for a prior declaration of a class or a function 9956 // declared as a friend, scopes outside the innermost enclosing 9957 // namespace scope are not considered. 9958 9959 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9960 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9961 DeclarationName Name = NameInfo.getName(); 9962 assert(Name); 9963 9964 // Check for unexpanded parameter packs. 9965 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9966 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9967 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9968 return 0; 9969 9970 // The context we found the declaration in, or in which we should 9971 // create the declaration. 9972 DeclContext *DC; 9973 Scope *DCScope = S; 9974 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9975 ForRedeclaration); 9976 9977 // FIXME: there are different rules in local classes 9978 9979 // There are four cases here. 9980 // - There's no scope specifier, in which case we just go to the 9981 // appropriate scope and look for a function or function template 9982 // there as appropriate. 9983 // Recover from invalid scope qualifiers as if they just weren't there. 9984 if (SS.isInvalid() || !SS.isSet()) { 9985 // C++0x [namespace.memdef]p3: 9986 // If the name in a friend declaration is neither qualified nor 9987 // a template-id and the declaration is a function or an 9988 // elaborated-type-specifier, the lookup to determine whether 9989 // the entity has been previously declared shall not consider 9990 // any scopes outside the innermost enclosing namespace. 9991 // C++0x [class.friend]p11: 9992 // If a friend declaration appears in a local class and the name 9993 // specified is an unqualified name, a prior declaration is 9994 // looked up without considering scopes that are outside the 9995 // innermost enclosing non-class scope. For a friend function 9996 // declaration, if there is no prior declaration, the program is 9997 // ill-formed. 9998 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9999 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10000 10001 // Find the appropriate context according to the above. 10002 DC = CurContext; 10003 while (true) { 10004 // Skip class contexts. If someone can cite chapter and verse 10005 // for this behavior, that would be nice --- it's what GCC and 10006 // EDG do, and it seems like a reasonable intent, but the spec 10007 // really only says that checks for unqualified existing 10008 // declarations should stop at the nearest enclosing namespace, 10009 // not that they should only consider the nearest enclosing 10010 // namespace. 10011 while (DC->isRecord()) 10012 DC = DC->getParent(); 10013 10014 LookupQualifiedName(Previous, DC); 10015 10016 // TODO: decide what we think about using declarations. 10017 if (isLocal || !Previous.empty()) 10018 break; 10019 10020 if (isTemplateId) { 10021 if (isa<TranslationUnitDecl>(DC)) break; 10022 } else { 10023 if (DC->isFileContext()) break; 10024 } 10025 DC = DC->getParent(); 10026 } 10027 10028 // C++ [class.friend]p1: A friend of a class is a function or 10029 // class that is not a member of the class . . . 10030 // C++11 changes this for both friend types and functions. 10031 // Most C++ 98 compilers do seem to give an error here, so 10032 // we do, too. 10033 if (!Previous.empty() && DC->Equals(CurContext)) 10034 Diag(DS.getFriendSpecLoc(), 10035 getLangOptions().CPlusPlus0x ? 10036 diag::warn_cxx98_compat_friend_is_member : 10037 diag::err_friend_is_member); 10038 10039 DCScope = getScopeForDeclContext(S, DC); 10040 10041 // C++ [class.friend]p6: 10042 // A function can be defined in a friend declaration of a class if and 10043 // only if the class is a non-local class (9.8), the function name is 10044 // unqualified, and the function has namespace scope. 10045 if (isLocal && D.isFunctionDefinition()) { 10046 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10047 } 10048 10049 // - There's a non-dependent scope specifier, in which case we 10050 // compute it and do a previous lookup there for a function 10051 // or function template. 10052 } else if (!SS.getScopeRep()->isDependent()) { 10053 DC = computeDeclContext(SS); 10054 if (!DC) return 0; 10055 10056 if (RequireCompleteDeclContext(SS, DC)) return 0; 10057 10058 LookupQualifiedName(Previous, DC); 10059 10060 // Ignore things found implicitly in the wrong scope. 10061 // TODO: better diagnostics for this case. Suggesting the right 10062 // qualified scope would be nice... 10063 LookupResult::Filter F = Previous.makeFilter(); 10064 while (F.hasNext()) { 10065 NamedDecl *D = F.next(); 10066 if (!DC->InEnclosingNamespaceSetOf( 10067 D->getDeclContext()->getRedeclContext())) 10068 F.erase(); 10069 } 10070 F.done(); 10071 10072 if (Previous.empty()) { 10073 D.setInvalidType(); 10074 Diag(Loc, diag::err_qualified_friend_not_found) 10075 << Name << TInfo->getType(); 10076 return 0; 10077 } 10078 10079 // C++ [class.friend]p1: A friend of a class is a function or 10080 // class that is not a member of the class . . . 10081 if (DC->Equals(CurContext)) 10082 Diag(DS.getFriendSpecLoc(), 10083 getLangOptions().CPlusPlus0x ? 10084 diag::warn_cxx98_compat_friend_is_member : 10085 diag::err_friend_is_member); 10086 10087 if (D.isFunctionDefinition()) { 10088 // C++ [class.friend]p6: 10089 // A function can be defined in a friend declaration of a class if and 10090 // only if the class is a non-local class (9.8), the function name is 10091 // unqualified, and the function has namespace scope. 10092 SemaDiagnosticBuilder DB 10093 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10094 10095 DB << SS.getScopeRep(); 10096 if (DC->isFileContext()) 10097 DB << FixItHint::CreateRemoval(SS.getRange()); 10098 SS.clear(); 10099 } 10100 10101 // - There's a scope specifier that does not match any template 10102 // parameter lists, in which case we use some arbitrary context, 10103 // create a method or method template, and wait for instantiation. 10104 // - There's a scope specifier that does match some template 10105 // parameter lists, which we don't handle right now. 10106 } else { 10107 if (D.isFunctionDefinition()) { 10108 // C++ [class.friend]p6: 10109 // A function can be defined in a friend declaration of a class if and 10110 // only if the class is a non-local class (9.8), the function name is 10111 // unqualified, and the function has namespace scope. 10112 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10113 << SS.getScopeRep(); 10114 } 10115 10116 DC = CurContext; 10117 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10118 } 10119 10120 if (!DC->isRecord()) { 10121 // This implies that it has to be an operator or function. 10122 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10123 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10124 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10125 Diag(Loc, diag::err_introducing_special_friend) << 10126 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10127 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10128 return 0; 10129 } 10130 } 10131 10132 bool AddToScope = true; 10133 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10134 move(TemplateParams), AddToScope); 10135 if (!ND) return 0; 10136 10137 assert(ND->getDeclContext() == DC); 10138 assert(ND->getLexicalDeclContext() == CurContext); 10139 10140 // Add the function declaration to the appropriate lookup tables, 10141 // adjusting the redeclarations list as necessary. We don't 10142 // want to do this yet if the friending class is dependent. 10143 // 10144 // Also update the scope-based lookup if the target context's 10145 // lookup context is in lexical scope. 10146 if (!CurContext->isDependentContext()) { 10147 DC = DC->getRedeclContext(); 10148 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10149 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10150 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10151 } 10152 10153 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10154 D.getIdentifierLoc(), ND, 10155 DS.getFriendSpecLoc()); 10156 FrD->setAccess(AS_public); 10157 CurContext->addDecl(FrD); 10158 10159 if (ND->isInvalidDecl()) 10160 FrD->setInvalidDecl(); 10161 else { 10162 FunctionDecl *FD; 10163 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10164 FD = FTD->getTemplatedDecl(); 10165 else 10166 FD = cast<FunctionDecl>(ND); 10167 10168 // Mark templated-scope function declarations as unsupported. 10169 if (FD->getNumTemplateParameterLists()) 10170 FrD->setUnsupportedFriend(true); 10171 } 10172 10173 return ND; 10174} 10175 10176void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10177 AdjustDeclIfTemplate(Dcl); 10178 10179 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10180 if (!Fn) { 10181 Diag(DelLoc, diag::err_deleted_non_function); 10182 return; 10183 } 10184 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10185 Diag(DelLoc, diag::err_deleted_decl_not_first); 10186 Diag(Prev->getLocation(), diag::note_previous_declaration); 10187 // If the declaration wasn't the first, we delete the function anyway for 10188 // recovery. 10189 } 10190 Fn->setDeletedAsWritten(); 10191} 10192 10193void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10194 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10195 10196 if (MD) { 10197 if (MD->getParent()->isDependentType()) { 10198 MD->setDefaulted(); 10199 MD->setExplicitlyDefaulted(); 10200 return; 10201 } 10202 10203 CXXSpecialMember Member = getSpecialMember(MD); 10204 if (Member == CXXInvalid) { 10205 Diag(DefaultLoc, diag::err_default_special_members); 10206 return; 10207 } 10208 10209 MD->setDefaulted(); 10210 MD->setExplicitlyDefaulted(); 10211 10212 // If this definition appears within the record, do the checking when 10213 // the record is complete. 10214 const FunctionDecl *Primary = MD; 10215 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10216 // Find the uninstantiated declaration that actually had the '= default' 10217 // on it. 10218 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10219 10220 if (Primary == Primary->getCanonicalDecl()) 10221 return; 10222 10223 switch (Member) { 10224 case CXXDefaultConstructor: { 10225 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10226 CheckExplicitlyDefaultedDefaultConstructor(CD); 10227 if (!CD->isInvalidDecl()) 10228 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10229 break; 10230 } 10231 10232 case CXXCopyConstructor: { 10233 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10234 CheckExplicitlyDefaultedCopyConstructor(CD); 10235 if (!CD->isInvalidDecl()) 10236 DefineImplicitCopyConstructor(DefaultLoc, CD); 10237 break; 10238 } 10239 10240 case CXXCopyAssignment: { 10241 CheckExplicitlyDefaultedCopyAssignment(MD); 10242 if (!MD->isInvalidDecl()) 10243 DefineImplicitCopyAssignment(DefaultLoc, MD); 10244 break; 10245 } 10246 10247 case CXXDestructor: { 10248 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10249 CheckExplicitlyDefaultedDestructor(DD); 10250 if (!DD->isInvalidDecl()) 10251 DefineImplicitDestructor(DefaultLoc, DD); 10252 break; 10253 } 10254 10255 case CXXMoveConstructor: { 10256 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10257 CheckExplicitlyDefaultedMoveConstructor(CD); 10258 if (!CD->isInvalidDecl()) 10259 DefineImplicitMoveConstructor(DefaultLoc, CD); 10260 break; 10261 } 10262 10263 case CXXMoveAssignment: { 10264 CheckExplicitlyDefaultedMoveAssignment(MD); 10265 if (!MD->isInvalidDecl()) 10266 DefineImplicitMoveAssignment(DefaultLoc, MD); 10267 break; 10268 } 10269 10270 case CXXInvalid: 10271 llvm_unreachable("Invalid special member."); 10272 } 10273 } else { 10274 Diag(DefaultLoc, diag::err_default_special_members); 10275 } 10276} 10277 10278static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10279 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10280 Stmt *SubStmt = *CI; 10281 if (!SubStmt) 10282 continue; 10283 if (isa<ReturnStmt>(SubStmt)) 10284 Self.Diag(SubStmt->getSourceRange().getBegin(), 10285 diag::err_return_in_constructor_handler); 10286 if (!isa<Expr>(SubStmt)) 10287 SearchForReturnInStmt(Self, SubStmt); 10288 } 10289} 10290 10291void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10292 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10293 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10294 SearchForReturnInStmt(*this, Handler); 10295 } 10296} 10297 10298bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10299 const CXXMethodDecl *Old) { 10300 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10301 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10302 10303 if (Context.hasSameType(NewTy, OldTy) || 10304 NewTy->isDependentType() || OldTy->isDependentType()) 10305 return false; 10306 10307 // Check if the return types are covariant 10308 QualType NewClassTy, OldClassTy; 10309 10310 /// Both types must be pointers or references to classes. 10311 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10312 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10313 NewClassTy = NewPT->getPointeeType(); 10314 OldClassTy = OldPT->getPointeeType(); 10315 } 10316 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10317 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10318 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10319 NewClassTy = NewRT->getPointeeType(); 10320 OldClassTy = OldRT->getPointeeType(); 10321 } 10322 } 10323 } 10324 10325 // The return types aren't either both pointers or references to a class type. 10326 if (NewClassTy.isNull()) { 10327 Diag(New->getLocation(), 10328 diag::err_different_return_type_for_overriding_virtual_function) 10329 << New->getDeclName() << NewTy << OldTy; 10330 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10331 10332 return true; 10333 } 10334 10335 // C++ [class.virtual]p6: 10336 // If the return type of D::f differs from the return type of B::f, the 10337 // class type in the return type of D::f shall be complete at the point of 10338 // declaration of D::f or shall be the class type D. 10339 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10340 if (!RT->isBeingDefined() && 10341 RequireCompleteType(New->getLocation(), NewClassTy, 10342 PDiag(diag::err_covariant_return_incomplete) 10343 << New->getDeclName())) 10344 return true; 10345 } 10346 10347 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10348 // Check if the new class derives from the old class. 10349 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10350 Diag(New->getLocation(), 10351 diag::err_covariant_return_not_derived) 10352 << New->getDeclName() << NewTy << OldTy; 10353 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10354 return true; 10355 } 10356 10357 // Check if we the conversion from derived to base is valid. 10358 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10359 diag::err_covariant_return_inaccessible_base, 10360 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10361 // FIXME: Should this point to the return type? 10362 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10363 // FIXME: this note won't trigger for delayed access control 10364 // diagnostics, and it's impossible to get an undelayed error 10365 // here from access control during the original parse because 10366 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10367 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10368 return true; 10369 } 10370 } 10371 10372 // The qualifiers of the return types must be the same. 10373 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10374 Diag(New->getLocation(), 10375 diag::err_covariant_return_type_different_qualifications) 10376 << New->getDeclName() << NewTy << OldTy; 10377 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10378 return true; 10379 }; 10380 10381 10382 // The new class type must have the same or less qualifiers as the old type. 10383 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10384 Diag(New->getLocation(), 10385 diag::err_covariant_return_type_class_type_more_qualified) 10386 << New->getDeclName() << NewTy << OldTy; 10387 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10388 return true; 10389 }; 10390 10391 return false; 10392} 10393 10394/// \brief Mark the given method pure. 10395/// 10396/// \param Method the method to be marked pure. 10397/// 10398/// \param InitRange the source range that covers the "0" initializer. 10399bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10400 SourceLocation EndLoc = InitRange.getEnd(); 10401 if (EndLoc.isValid()) 10402 Method->setRangeEnd(EndLoc); 10403 10404 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10405 Method->setPure(); 10406 return false; 10407 } 10408 10409 if (!Method->isInvalidDecl()) 10410 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10411 << Method->getDeclName() << InitRange; 10412 return true; 10413} 10414 10415/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10416/// an initializer for the out-of-line declaration 'Dcl'. The scope 10417/// is a fresh scope pushed for just this purpose. 10418/// 10419/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10420/// static data member of class X, names should be looked up in the scope of 10421/// class X. 10422void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10423 // If there is no declaration, there was an error parsing it. 10424 if (D == 0 || D->isInvalidDecl()) return; 10425 10426 // We should only get called for declarations with scope specifiers, like: 10427 // int foo::bar; 10428 assert(D->isOutOfLine()); 10429 EnterDeclaratorContext(S, D->getDeclContext()); 10430} 10431 10432/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10433/// initializer for the out-of-line declaration 'D'. 10434void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10435 // If there is no declaration, there was an error parsing it. 10436 if (D == 0 || D->isInvalidDecl()) return; 10437 10438 assert(D->isOutOfLine()); 10439 ExitDeclaratorContext(S); 10440} 10441 10442/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10443/// C++ if/switch/while/for statement. 10444/// e.g: "if (int x = f()) {...}" 10445DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10446 // C++ 6.4p2: 10447 // The declarator shall not specify a function or an array. 10448 // The type-specifier-seq shall not contain typedef and shall not declare a 10449 // new class or enumeration. 10450 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10451 "Parser allowed 'typedef' as storage class of condition decl."); 10452 10453 Decl *Dcl = ActOnDeclarator(S, D); 10454 if (!Dcl) 10455 return true; 10456 10457 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10458 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10459 << D.getSourceRange(); 10460 return true; 10461 } 10462 10463 return Dcl; 10464} 10465 10466void Sema::LoadExternalVTableUses() { 10467 if (!ExternalSource) 10468 return; 10469 10470 SmallVector<ExternalVTableUse, 4> VTables; 10471 ExternalSource->ReadUsedVTables(VTables); 10472 SmallVector<VTableUse, 4> NewUses; 10473 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10474 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10475 = VTablesUsed.find(VTables[I].Record); 10476 // Even if a definition wasn't required before, it may be required now. 10477 if (Pos != VTablesUsed.end()) { 10478 if (!Pos->second && VTables[I].DefinitionRequired) 10479 Pos->second = true; 10480 continue; 10481 } 10482 10483 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10484 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10485 } 10486 10487 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10488} 10489 10490void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10491 bool DefinitionRequired) { 10492 // Ignore any vtable uses in unevaluated operands or for classes that do 10493 // not have a vtable. 10494 if (!Class->isDynamicClass() || Class->isDependentContext() || 10495 CurContext->isDependentContext() || 10496 ExprEvalContexts.back().Context == Unevaluated) 10497 return; 10498 10499 // Try to insert this class into the map. 10500 LoadExternalVTableUses(); 10501 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10502 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10503 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10504 if (!Pos.second) { 10505 // If we already had an entry, check to see if we are promoting this vtable 10506 // to required a definition. If so, we need to reappend to the VTableUses 10507 // list, since we may have already processed the first entry. 10508 if (DefinitionRequired && !Pos.first->second) { 10509 Pos.first->second = true; 10510 } else { 10511 // Otherwise, we can early exit. 10512 return; 10513 } 10514 } 10515 10516 // Local classes need to have their virtual members marked 10517 // immediately. For all other classes, we mark their virtual members 10518 // at the end of the translation unit. 10519 if (Class->isLocalClass()) 10520 MarkVirtualMembersReferenced(Loc, Class); 10521 else 10522 VTableUses.push_back(std::make_pair(Class, Loc)); 10523} 10524 10525bool Sema::DefineUsedVTables() { 10526 LoadExternalVTableUses(); 10527 if (VTableUses.empty()) 10528 return false; 10529 10530 // Note: The VTableUses vector could grow as a result of marking 10531 // the members of a class as "used", so we check the size each 10532 // time through the loop and prefer indices (with are stable) to 10533 // iterators (which are not). 10534 bool DefinedAnything = false; 10535 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10536 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10537 if (!Class) 10538 continue; 10539 10540 SourceLocation Loc = VTableUses[I].second; 10541 10542 // If this class has a key function, but that key function is 10543 // defined in another translation unit, we don't need to emit the 10544 // vtable even though we're using it. 10545 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10546 if (KeyFunction && !KeyFunction->hasBody()) { 10547 switch (KeyFunction->getTemplateSpecializationKind()) { 10548 case TSK_Undeclared: 10549 case TSK_ExplicitSpecialization: 10550 case TSK_ExplicitInstantiationDeclaration: 10551 // The key function is in another translation unit. 10552 continue; 10553 10554 case TSK_ExplicitInstantiationDefinition: 10555 case TSK_ImplicitInstantiation: 10556 // We will be instantiating the key function. 10557 break; 10558 } 10559 } else if (!KeyFunction) { 10560 // If we have a class with no key function that is the subject 10561 // of an explicit instantiation declaration, suppress the 10562 // vtable; it will live with the explicit instantiation 10563 // definition. 10564 bool IsExplicitInstantiationDeclaration 10565 = Class->getTemplateSpecializationKind() 10566 == TSK_ExplicitInstantiationDeclaration; 10567 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10568 REnd = Class->redecls_end(); 10569 R != REnd; ++R) { 10570 TemplateSpecializationKind TSK 10571 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10572 if (TSK == TSK_ExplicitInstantiationDeclaration) 10573 IsExplicitInstantiationDeclaration = true; 10574 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10575 IsExplicitInstantiationDeclaration = false; 10576 break; 10577 } 10578 } 10579 10580 if (IsExplicitInstantiationDeclaration) 10581 continue; 10582 } 10583 10584 // Mark all of the virtual members of this class as referenced, so 10585 // that we can build a vtable. Then, tell the AST consumer that a 10586 // vtable for this class is required. 10587 DefinedAnything = true; 10588 MarkVirtualMembersReferenced(Loc, Class); 10589 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10590 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10591 10592 // Optionally warn if we're emitting a weak vtable. 10593 if (Class->getLinkage() == ExternalLinkage && 10594 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10595 const FunctionDecl *KeyFunctionDef = 0; 10596 if (!KeyFunction || 10597 (KeyFunction->hasBody(KeyFunctionDef) && 10598 KeyFunctionDef->isInlined())) 10599 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10600 } 10601 } 10602 VTableUses.clear(); 10603 10604 return DefinedAnything; 10605} 10606 10607void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10608 const CXXRecordDecl *RD) { 10609 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10610 e = RD->method_end(); i != e; ++i) { 10611 CXXMethodDecl *MD = *i; 10612 10613 // C++ [basic.def.odr]p2: 10614 // [...] A virtual member function is used if it is not pure. [...] 10615 if (MD->isVirtual() && !MD->isPure()) 10616 MarkDeclarationReferenced(Loc, MD); 10617 } 10618 10619 // Only classes that have virtual bases need a VTT. 10620 if (RD->getNumVBases() == 0) 10621 return; 10622 10623 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10624 e = RD->bases_end(); i != e; ++i) { 10625 const CXXRecordDecl *Base = 10626 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10627 if (Base->getNumVBases() == 0) 10628 continue; 10629 MarkVirtualMembersReferenced(Loc, Base); 10630 } 10631} 10632 10633/// SetIvarInitializers - This routine builds initialization ASTs for the 10634/// Objective-C implementation whose ivars need be initialized. 10635void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10636 if (!getLangOptions().CPlusPlus) 10637 return; 10638 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10639 SmallVector<ObjCIvarDecl*, 8> ivars; 10640 CollectIvarsToConstructOrDestruct(OID, ivars); 10641 if (ivars.empty()) 10642 return; 10643 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10644 for (unsigned i = 0; i < ivars.size(); i++) { 10645 FieldDecl *Field = ivars[i]; 10646 if (Field->isInvalidDecl()) 10647 continue; 10648 10649 CXXCtorInitializer *Member; 10650 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10651 InitializationKind InitKind = 10652 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10653 10654 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10655 ExprResult MemberInit = 10656 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10657 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10658 // Note, MemberInit could actually come back empty if no initialization 10659 // is required (e.g., because it would call a trivial default constructor) 10660 if (!MemberInit.get() || MemberInit.isInvalid()) 10661 continue; 10662 10663 Member = 10664 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10665 SourceLocation(), 10666 MemberInit.takeAs<Expr>(), 10667 SourceLocation()); 10668 AllToInit.push_back(Member); 10669 10670 // Be sure that the destructor is accessible and is marked as referenced. 10671 if (const RecordType *RecordTy 10672 = Context.getBaseElementType(Field->getType()) 10673 ->getAs<RecordType>()) { 10674 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10675 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10676 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10677 CheckDestructorAccess(Field->getLocation(), Destructor, 10678 PDiag(diag::err_access_dtor_ivar) 10679 << Context.getBaseElementType(Field->getType())); 10680 } 10681 } 10682 } 10683 ObjCImplementation->setIvarInitializers(Context, 10684 AllToInit.data(), AllToInit.size()); 10685 } 10686} 10687 10688static 10689void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10690 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10691 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10692 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10693 Sema &S) { 10694 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10695 CE = Current.end(); 10696 if (Ctor->isInvalidDecl()) 10697 return; 10698 10699 const FunctionDecl *FNTarget = 0; 10700 CXXConstructorDecl *Target; 10701 10702 // We ignore the result here since if we don't have a body, Target will be 10703 // null below. 10704 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10705 Target 10706= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10707 10708 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10709 // Avoid dereferencing a null pointer here. 10710 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10711 10712 if (!Current.insert(Canonical)) 10713 return; 10714 10715 // We know that beyond here, we aren't chaining into a cycle. 10716 if (!Target || !Target->isDelegatingConstructor() || 10717 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10718 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10719 Valid.insert(*CI); 10720 Current.clear(); 10721 // We've hit a cycle. 10722 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10723 Current.count(TCanonical)) { 10724 // If we haven't diagnosed this cycle yet, do so now. 10725 if (!Invalid.count(TCanonical)) { 10726 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10727 diag::warn_delegating_ctor_cycle) 10728 << Ctor; 10729 10730 // Don't add a note for a function delegating directo to itself. 10731 if (TCanonical != Canonical) 10732 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10733 10734 CXXConstructorDecl *C = Target; 10735 while (C->getCanonicalDecl() != Canonical) { 10736 (void)C->getTargetConstructor()->hasBody(FNTarget); 10737 assert(FNTarget && "Ctor cycle through bodiless function"); 10738 10739 C 10740 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10741 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10742 } 10743 } 10744 10745 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10746 Invalid.insert(*CI); 10747 Current.clear(); 10748 } else { 10749 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10750 } 10751} 10752 10753 10754void Sema::CheckDelegatingCtorCycles() { 10755 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10756 10757 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10758 CE = Current.end(); 10759 10760 for (DelegatingCtorDeclsType::iterator 10761 I = DelegatingCtorDecls.begin(ExternalSource), 10762 E = DelegatingCtorDecls.end(); 10763 I != E; ++I) { 10764 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10765 } 10766 10767 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10768 (*CI)->setInvalidDecl(); 10769} 10770 10771/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10772Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10773 // Implicitly declared functions (e.g. copy constructors) are 10774 // __host__ __device__ 10775 if (D->isImplicit()) 10776 return CFT_HostDevice; 10777 10778 if (D->hasAttr<CUDAGlobalAttr>()) 10779 return CFT_Global; 10780 10781 if (D->hasAttr<CUDADeviceAttr>()) { 10782 if (D->hasAttr<CUDAHostAttr>()) 10783 return CFT_HostDevice; 10784 else 10785 return CFT_Device; 10786 } 10787 10788 return CFT_Host; 10789} 10790 10791bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10792 CUDAFunctionTarget CalleeTarget) { 10793 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10794 // Callable from the device only." 10795 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10796 return true; 10797 10798 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10799 // Callable from the host only." 10800 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10801 // Callable from the host only." 10802 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10803 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10804 return true; 10805 10806 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10807 return true; 10808 10809 return false; 10810} 10811