SemaDeclCXX.cpp revision 67310745f32be49d85aca83b47a7707f63a82adf
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer. 1749MemInitResult 1750Sema::BuildMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 SourceLocation IdLoc, 1756 const MultiInitializer &Args, 1757 SourceLocation EllipsisLoc) { 1758 if (!ConstructorD) 1759 return true; 1760 1761 AdjustDeclIfTemplate(ConstructorD); 1762 1763 CXXConstructorDecl *Constructor 1764 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1765 if (!Constructor) { 1766 // The user wrote a constructor initializer on a function that is 1767 // not a C++ constructor. Ignore the error for now, because we may 1768 // have more member initializers coming; we'll diagnose it just 1769 // once in ActOnMemInitializers. 1770 return true; 1771 } 1772 1773 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1774 1775 // C++ [class.base.init]p2: 1776 // Names in a mem-initializer-id are looked up in the scope of the 1777 // constructor's class and, if not found in that scope, are looked 1778 // up in the scope containing the constructor's definition. 1779 // [Note: if the constructor's class contains a member with the 1780 // same name as a direct or virtual base class of the class, a 1781 // mem-initializer-id naming the member or base class and composed 1782 // of a single identifier refers to the class member. A 1783 // mem-initializer-id for the hidden base class may be specified 1784 // using a qualified name. ] 1785 if (!SS.getScopeRep() && !TemplateTypeTy) { 1786 // Look for a member, first. 1787 DeclContext::lookup_result Result 1788 = ClassDecl->lookup(MemberOrBase); 1789 if (Result.first != Result.second) { 1790 ValueDecl *Member; 1791 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1792 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1793 if (EllipsisLoc.isValid()) 1794 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1795 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1796 1797 return BuildMemberInitializer(Member, Args, IdLoc); 1798 } 1799 } 1800 } 1801 // It didn't name a member, so see if it names a class. 1802 QualType BaseType; 1803 TypeSourceInfo *TInfo = 0; 1804 1805 if (TemplateTypeTy) { 1806 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1807 } else { 1808 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1809 LookupParsedName(R, S, &SS); 1810 1811 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1812 if (!TyD) { 1813 if (R.isAmbiguous()) return true; 1814 1815 // We don't want access-control diagnostics here. 1816 R.suppressDiagnostics(); 1817 1818 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1819 bool NotUnknownSpecialization = false; 1820 DeclContext *DC = computeDeclContext(SS, false); 1821 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1822 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1823 1824 if (!NotUnknownSpecialization) { 1825 // When the scope specifier can refer to a member of an unknown 1826 // specialization, we take it as a type name. 1827 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1828 SS.getWithLocInContext(Context), 1829 *MemberOrBase, IdLoc); 1830 if (BaseType.isNull()) 1831 return true; 1832 1833 R.clear(); 1834 R.setLookupName(MemberOrBase); 1835 } 1836 } 1837 1838 // If no results were found, try to correct typos. 1839 TypoCorrection Corr; 1840 if (R.empty() && BaseType.isNull() && 1841 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1842 ClassDecl, false, CTC_NoKeywords))) { 1843 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1844 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1845 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1846 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1847 // We have found a non-static data member with a similar 1848 // name to what was typed; complain and initialize that 1849 // member. 1850 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1851 << MemberOrBase << true << CorrectedQuotedStr 1852 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1853 Diag(Member->getLocation(), diag::note_previous_decl) 1854 << CorrectedQuotedStr; 1855 1856 return BuildMemberInitializer(Member, Args, IdLoc); 1857 } 1858 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1859 const CXXBaseSpecifier *DirectBaseSpec; 1860 const CXXBaseSpecifier *VirtualBaseSpec; 1861 if (FindBaseInitializer(*this, ClassDecl, 1862 Context.getTypeDeclType(Type), 1863 DirectBaseSpec, VirtualBaseSpec)) { 1864 // We have found a direct or virtual base class with a 1865 // similar name to what was typed; complain and initialize 1866 // that base class. 1867 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1868 << MemberOrBase << false << CorrectedQuotedStr 1869 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1870 1871 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1872 : VirtualBaseSpec; 1873 Diag(BaseSpec->getSourceRange().getBegin(), 1874 diag::note_base_class_specified_here) 1875 << BaseSpec->getType() 1876 << BaseSpec->getSourceRange(); 1877 1878 TyD = Type; 1879 } 1880 } 1881 } 1882 1883 if (!TyD && BaseType.isNull()) { 1884 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1885 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1886 return true; 1887 } 1888 } 1889 1890 if (BaseType.isNull()) { 1891 BaseType = Context.getTypeDeclType(TyD); 1892 if (SS.isSet()) { 1893 NestedNameSpecifier *Qualifier = 1894 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1895 1896 // FIXME: preserve source range information 1897 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1898 } 1899 } 1900 } 1901 1902 if (!TInfo) 1903 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1904 1905 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1906} 1907 1908/// Checks a member initializer expression for cases where reference (or 1909/// pointer) members are bound to by-value parameters (or their addresses). 1910static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1911 Expr *Init, 1912 SourceLocation IdLoc) { 1913 QualType MemberTy = Member->getType(); 1914 1915 // We only handle pointers and references currently. 1916 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1917 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1918 return; 1919 1920 const bool IsPointer = MemberTy->isPointerType(); 1921 if (IsPointer) { 1922 if (const UnaryOperator *Op 1923 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1924 // The only case we're worried about with pointers requires taking the 1925 // address. 1926 if (Op->getOpcode() != UO_AddrOf) 1927 return; 1928 1929 Init = Op->getSubExpr(); 1930 } else { 1931 // We only handle address-of expression initializers for pointers. 1932 return; 1933 } 1934 } 1935 1936 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1937 // Taking the address of a temporary will be diagnosed as a hard error. 1938 if (IsPointer) 1939 return; 1940 1941 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1942 << Member << Init->getSourceRange(); 1943 } else if (const DeclRefExpr *DRE 1944 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1945 // We only warn when referring to a non-reference parameter declaration. 1946 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1947 if (!Parameter || Parameter->getType()->isReferenceType()) 1948 return; 1949 1950 S.Diag(Init->getExprLoc(), 1951 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1952 : diag::warn_bind_ref_member_to_parameter) 1953 << Member << Parameter << Init->getSourceRange(); 1954 } else { 1955 // Other initializers are fine. 1956 return; 1957 } 1958 1959 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1960 << (unsigned)IsPointer; 1961} 1962 1963/// Checks an initializer expression for use of uninitialized fields, such as 1964/// containing the field that is being initialized. Returns true if there is an 1965/// uninitialized field was used an updates the SourceLocation parameter; false 1966/// otherwise. 1967static bool InitExprContainsUninitializedFields(const Stmt *S, 1968 const ValueDecl *LhsField, 1969 SourceLocation *L) { 1970 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1971 1972 if (isa<CallExpr>(S)) { 1973 // Do not descend into function calls or constructors, as the use 1974 // of an uninitialized field may be valid. One would have to inspect 1975 // the contents of the function/ctor to determine if it is safe or not. 1976 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1977 // may be safe, depending on what the function/ctor does. 1978 return false; 1979 } 1980 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1981 const NamedDecl *RhsField = ME->getMemberDecl(); 1982 1983 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1984 // The member expression points to a static data member. 1985 assert(VD->isStaticDataMember() && 1986 "Member points to non-static data member!"); 1987 (void)VD; 1988 return false; 1989 } 1990 1991 if (isa<EnumConstantDecl>(RhsField)) { 1992 // The member expression points to an enum. 1993 return false; 1994 } 1995 1996 if (RhsField == LhsField) { 1997 // Initializing a field with itself. Throw a warning. 1998 // But wait; there are exceptions! 1999 // Exception #1: The field may not belong to this record. 2000 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2001 const Expr *base = ME->getBase(); 2002 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2003 // Even though the field matches, it does not belong to this record. 2004 return false; 2005 } 2006 // None of the exceptions triggered; return true to indicate an 2007 // uninitialized field was used. 2008 *L = ME->getMemberLoc(); 2009 return true; 2010 } 2011 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2012 // sizeof/alignof doesn't reference contents, do not warn. 2013 return false; 2014 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2015 // address-of doesn't reference contents (the pointer may be dereferenced 2016 // in the same expression but it would be rare; and weird). 2017 if (UOE->getOpcode() == UO_AddrOf) 2018 return false; 2019 } 2020 for (Stmt::const_child_range it = S->children(); it; ++it) { 2021 if (!*it) { 2022 // An expression such as 'member(arg ?: "")' may trigger this. 2023 continue; 2024 } 2025 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2026 return true; 2027 } 2028 return false; 2029} 2030 2031MemInitResult 2032Sema::BuildMemberInitializer(ValueDecl *Member, 2033 const MultiInitializer &Args, 2034 SourceLocation IdLoc) { 2035 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2036 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2037 assert((DirectMember || IndirectMember) && 2038 "Member must be a FieldDecl or IndirectFieldDecl"); 2039 2040 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2041 return true; 2042 2043 if (Member->isInvalidDecl()) 2044 return true; 2045 2046 // Diagnose value-uses of fields to initialize themselves, e.g. 2047 // foo(foo) 2048 // where foo is not also a parameter to the constructor. 2049 // TODO: implement -Wuninitialized and fold this into that framework. 2050 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2051 I != E; ++I) { 2052 SourceLocation L; 2053 Expr *Arg = *I; 2054 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2055 Arg = DIE->getInit(); 2056 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2057 // FIXME: Return true in the case when other fields are used before being 2058 // uninitialized. For example, let this field be the i'th field. When 2059 // initializing the i'th field, throw a warning if any of the >= i'th 2060 // fields are used, as they are not yet initialized. 2061 // Right now we are only handling the case where the i'th field uses 2062 // itself in its initializer. 2063 Diag(L, diag::warn_field_is_uninit); 2064 } 2065 } 2066 2067 bool HasDependentArg = Args.isTypeDependent(); 2068 2069 Expr *Init; 2070 if (Member->getType()->isDependentType() || HasDependentArg) { 2071 // Can't check initialization for a member of dependent type or when 2072 // any of the arguments are type-dependent expressions. 2073 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2074 2075 DiscardCleanupsInEvaluationContext(); 2076 } else { 2077 // Initialize the member. 2078 InitializedEntity MemberEntity = 2079 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2080 : InitializedEntity::InitializeMember(IndirectMember, 0); 2081 InitializationKind Kind = 2082 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2083 Args.getEndLoc()); 2084 2085 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2086 if (MemberInit.isInvalid()) 2087 return true; 2088 2089 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2090 2091 // C++0x [class.base.init]p7: 2092 // The initialization of each base and member constitutes a 2093 // full-expression. 2094 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2095 if (MemberInit.isInvalid()) 2096 return true; 2097 2098 // If we are in a dependent context, template instantiation will 2099 // perform this type-checking again. Just save the arguments that we 2100 // received in a ParenListExpr. 2101 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2102 // of the information that we have about the member 2103 // initializer. However, deconstructing the ASTs is a dicey process, 2104 // and this approach is far more likely to get the corner cases right. 2105 if (CurContext->isDependentContext()) { 2106 Init = Args.CreateInitExpr(Context, 2107 Member->getType().getNonReferenceType()); 2108 } else { 2109 Init = MemberInit.get(); 2110 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2111 } 2112 } 2113 2114 if (DirectMember) { 2115 return new (Context) CXXCtorInitializer(Context, DirectMember, 2116 IdLoc, Args.getStartLoc(), 2117 Init, Args.getEndLoc()); 2118 } else { 2119 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } 2123} 2124 2125MemInitResult 2126Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2127 const MultiInitializer &Args, 2128 CXXRecordDecl *ClassDecl) { 2129 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2130 if (!LangOpts.CPlusPlus0x) 2131 return Diag(NameLoc, diag::err_delegating_ctor) 2132 << TInfo->getTypeLoc().getLocalSourceRange(); 2133 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2134 2135 // Initialize the object. 2136 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2137 QualType(ClassDecl->getTypeForDecl(), 0)); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2143 if (DelegationInit.isInvalid()) 2144 return true; 2145 2146 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2147 "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2159 DelegationInit.takeAs<Expr>(), 2160 Args.getEndLoc()); 2161} 2162 2163MemInitResult 2164Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2165 const MultiInitializer &Args, 2166 CXXRecordDecl *ClassDecl, 2167 SourceLocation EllipsisLoc) { 2168 bool HasDependentArg = Args.isTypeDependent(); 2169 2170 SourceLocation BaseLoc 2171 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2172 2173 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2174 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2175 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2176 2177 // C++ [class.base.init]p2: 2178 // [...] Unless the mem-initializer-id names a nonstatic data 2179 // member of the constructor's class or a direct or virtual base 2180 // of that class, the mem-initializer is ill-formed. A 2181 // mem-initializer-list can initialize a base class using any 2182 // name that denotes that base class type. 2183 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2184 2185 if (EllipsisLoc.isValid()) { 2186 // This is a pack expansion. 2187 if (!BaseType->containsUnexpandedParameterPack()) { 2188 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2189 << SourceRange(BaseLoc, Args.getEndLoc()); 2190 2191 EllipsisLoc = SourceLocation(); 2192 } 2193 } else { 2194 // Check for any unexpanded parameter packs. 2195 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2196 return true; 2197 2198 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2199 return true; 2200 } 2201 2202 // Check for direct and virtual base classes. 2203 const CXXBaseSpecifier *DirectBaseSpec = 0; 2204 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2205 if (!Dependent) { 2206 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2207 BaseType)) 2208 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2209 2210 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2211 VirtualBaseSpec); 2212 2213 // C++ [base.class.init]p2: 2214 // Unless the mem-initializer-id names a nonstatic data member of the 2215 // constructor's class or a direct or virtual base of that class, the 2216 // mem-initializer is ill-formed. 2217 if (!DirectBaseSpec && !VirtualBaseSpec) { 2218 // If the class has any dependent bases, then it's possible that 2219 // one of those types will resolve to the same type as 2220 // BaseType. Therefore, just treat this as a dependent base 2221 // class initialization. FIXME: Should we try to check the 2222 // initialization anyway? It seems odd. 2223 if (ClassDecl->hasAnyDependentBases()) 2224 Dependent = true; 2225 else 2226 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2227 << BaseType << Context.getTypeDeclType(ClassDecl) 2228 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 } 2230 } 2231 2232 if (Dependent) { 2233 // Can't check initialization for a base of dependent type or when 2234 // any of the arguments are type-dependent expressions. 2235 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2236 2237 DiscardCleanupsInEvaluationContext(); 2238 2239 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2240 /*IsVirtual=*/false, 2241 Args.getStartLoc(), BaseInit, 2242 Args.getEndLoc(), EllipsisLoc); 2243 } 2244 2245 // C++ [base.class.init]p2: 2246 // If a mem-initializer-id is ambiguous because it designates both 2247 // a direct non-virtual base class and an inherited virtual base 2248 // class, the mem-initializer is ill-formed. 2249 if (DirectBaseSpec && VirtualBaseSpec) 2250 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 CXXBaseSpecifier *BaseSpec 2254 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2255 if (!BaseSpec) 2256 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2257 2258 // Initialize the base. 2259 InitializedEntity BaseEntity = 2260 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2261 InitializationKind Kind = 2262 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2263 Args.getEndLoc()); 2264 2265 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2266 if (BaseInit.isInvalid()) 2267 return true; 2268 2269 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2270 2271 // C++0x [class.base.init]p7: 2272 // The initialization of each base and member constitutes a 2273 // full-expression. 2274 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2275 if (BaseInit.isInvalid()) 2276 return true; 2277 2278 // If we are in a dependent context, template instantiation will 2279 // perform this type-checking again. Just save the arguments that we 2280 // received in a ParenListExpr. 2281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2282 // of the information that we have about the base 2283 // initializer. However, deconstructing the ASTs is a dicey process, 2284 // and this approach is far more likely to get the corner cases right. 2285 if (CurContext->isDependentContext()) 2286 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2287 2288 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2289 BaseSpec->isVirtual(), 2290 Args.getStartLoc(), 2291 BaseInit.takeAs<Expr>(), 2292 Args.getEndLoc(), EllipsisLoc); 2293} 2294 2295// Create a static_cast\<T&&>(expr). 2296static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2297 QualType ExprType = E->getType(); 2298 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2299 SourceLocation ExprLoc = E->getLocStart(); 2300 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2301 TargetType, ExprLoc); 2302 2303 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2304 SourceRange(ExprLoc, ExprLoc), 2305 E->getSourceRange()).take(); 2306} 2307 2308/// ImplicitInitializerKind - How an implicit base or member initializer should 2309/// initialize its base or member. 2310enum ImplicitInitializerKind { 2311 IIK_Default, 2312 IIK_Copy, 2313 IIK_Move 2314}; 2315 2316static bool 2317BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2318 ImplicitInitializerKind ImplicitInitKind, 2319 CXXBaseSpecifier *BaseSpec, 2320 bool IsInheritedVirtualBase, 2321 CXXCtorInitializer *&CXXBaseInit) { 2322 InitializedEntity InitEntity 2323 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2324 IsInheritedVirtualBase); 2325 2326 ExprResult BaseInit; 2327 2328 switch (ImplicitInitKind) { 2329 case IIK_Default: { 2330 InitializationKind InitKind 2331 = InitializationKind::CreateDefault(Constructor->getLocation()); 2332 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2333 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2334 MultiExprArg(SemaRef, 0, 0)); 2335 break; 2336 } 2337 2338 case IIK_Move: 2339 case IIK_Copy: { 2340 bool Moving = ImplicitInitKind == IIK_Move; 2341 ParmVarDecl *Param = Constructor->getParamDecl(0); 2342 QualType ParamType = Param->getType().getNonReferenceType(); 2343 2344 Expr *CopyCtorArg = 2345 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2346 Constructor->getLocation(), ParamType, 2347 VK_LValue, 0); 2348 2349 // Cast to the base class to avoid ambiguities. 2350 QualType ArgTy = 2351 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2352 ParamType.getQualifiers()); 2353 2354 if (Moving) { 2355 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2356 } 2357 2358 CXXCastPath BasePath; 2359 BasePath.push_back(BaseSpec); 2360 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2361 CK_UncheckedDerivedToBase, 2362 Moving ? VK_XValue : VK_LValue, 2363 &BasePath).take(); 2364 2365 InitializationKind InitKind 2366 = InitializationKind::CreateDirect(Constructor->getLocation(), 2367 SourceLocation(), SourceLocation()); 2368 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2369 &CopyCtorArg, 1); 2370 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2371 MultiExprArg(&CopyCtorArg, 1)); 2372 break; 2373 } 2374 } 2375 2376 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2377 if (BaseInit.isInvalid()) 2378 return true; 2379 2380 CXXBaseInit = 2381 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2382 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2383 SourceLocation()), 2384 BaseSpec->isVirtual(), 2385 SourceLocation(), 2386 BaseInit.takeAs<Expr>(), 2387 SourceLocation(), 2388 SourceLocation()); 2389 2390 return false; 2391} 2392 2393static bool RefersToRValueRef(Expr *MemRef) { 2394 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2395 return Referenced->getType()->isRValueReferenceType(); 2396} 2397 2398static bool 2399BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 FieldDecl *Field, IndirectFieldDecl *Indirect, 2402 CXXCtorInitializer *&CXXMemberInit) { 2403 if (Field->isInvalidDecl()) 2404 return true; 2405 2406 SourceLocation Loc = Constructor->getLocation(); 2407 2408 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2409 bool Moving = ImplicitInitKind == IIK_Move; 2410 ParmVarDecl *Param = Constructor->getParamDecl(0); 2411 QualType ParamType = Param->getType().getNonReferenceType(); 2412 2413 // Suppress copying zero-width bitfields. 2414 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636 2637 bool isImplicitCopyOrMove() const { 2638 switch (IIK) { 2639 case IIK_Copy: 2640 case IIK_Move: 2641 return true; 2642 2643 case IIK_Default: 2644 return false; 2645 } 2646 2647 return false; 2648 } 2649}; 2650} 2651 2652/// \brief Determine whether the given indirect field declaration is somewhere 2653/// within an anonymous union. 2654static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2655 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2656 CEnd = F->chain_end(); 2657 C != CEnd; ++C) 2658 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2659 if (Record->isUnion()) 2660 return true; 2661 2662 return false; 2663} 2664 2665/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2666/// array type. 2667static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2668 if (T->isIncompleteArrayType()) 2669 return true; 2670 2671 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2672 if (!ArrayT->getSize()) 2673 return true; 2674 2675 T = ArrayT->getElementType(); 2676 } 2677 2678 return false; 2679} 2680 2681static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2682 FieldDecl *Field, 2683 IndirectFieldDecl *Indirect = 0) { 2684 2685 // Overwhelmingly common case: we have a direct initializer for this field. 2686 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2687 Info.AllToInit.push_back(Init); 2688 return false; 2689 } 2690 2691 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2692 // has a brace-or-equal-initializer, the entity is initialized as specified 2693 // in [dcl.init]. 2694 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2695 CXXCtorInitializer *Init; 2696 if (Indirect) 2697 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2698 SourceLocation(), 2699 SourceLocation(), 0, 2700 SourceLocation()); 2701 else 2702 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2703 SourceLocation(), 2704 SourceLocation(), 0, 2705 SourceLocation()); 2706 Info.AllToInit.push_back(Init); 2707 return false; 2708 } 2709 2710 // Don't build an implicit initializer for union members if none was 2711 // explicitly specified. 2712 if (Field->getParent()->isUnion() || 2713 (Indirect && isWithinAnonymousUnion(Indirect))) 2714 return false; 2715 2716 // Don't initialize incomplete or zero-length arrays. 2717 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2718 return false; 2719 2720 // Don't try to build an implicit initializer if there were semantic 2721 // errors in any of the initializers (and therefore we might be 2722 // missing some that the user actually wrote). 2723 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2724 return false; 2725 2726 CXXCtorInitializer *Init = 0; 2727 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2728 Indirect, Init)) 2729 return true; 2730 2731 if (Init) 2732 Info.AllToInit.push_back(Init); 2733 2734 return false; 2735} 2736 2737bool 2738Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2739 CXXCtorInitializer *Initializer) { 2740 assert(Initializer->isDelegatingInitializer()); 2741 Constructor->setNumCtorInitializers(1); 2742 CXXCtorInitializer **initializer = 2743 new (Context) CXXCtorInitializer*[1]; 2744 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2745 Constructor->setCtorInitializers(initializer); 2746 2747 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2748 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2749 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2750 } 2751 2752 DelegatingCtorDecls.push_back(Constructor); 2753 2754 return false; 2755} 2756 2757bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2758 CXXCtorInitializer **Initializers, 2759 unsigned NumInitializers, 2760 bool AnyErrors) { 2761 if (Constructor->isDependentContext()) { 2762 // Just store the initializers as written, they will be checked during 2763 // instantiation. 2764 if (NumInitializers > 0) { 2765 Constructor->setNumCtorInitializers(NumInitializers); 2766 CXXCtorInitializer **baseOrMemberInitializers = 2767 new (Context) CXXCtorInitializer*[NumInitializers]; 2768 memcpy(baseOrMemberInitializers, Initializers, 2769 NumInitializers * sizeof(CXXCtorInitializer*)); 2770 Constructor->setCtorInitializers(baseOrMemberInitializers); 2771 } 2772 2773 return false; 2774 } 2775 2776 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2777 2778 // We need to build the initializer AST according to order of construction 2779 // and not what user specified in the Initializers list. 2780 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2781 if (!ClassDecl) 2782 return true; 2783 2784 bool HadError = false; 2785 2786 for (unsigned i = 0; i < NumInitializers; i++) { 2787 CXXCtorInitializer *Member = Initializers[i]; 2788 2789 if (Member->isBaseInitializer()) 2790 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2791 else 2792 Info.AllBaseFields[Member->getAnyMember()] = Member; 2793 } 2794 2795 // Keep track of the direct virtual bases. 2796 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2797 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2798 E = ClassDecl->bases_end(); I != E; ++I) { 2799 if (I->isVirtual()) 2800 DirectVBases.insert(I); 2801 } 2802 2803 // Push virtual bases before others. 2804 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2805 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2806 2807 if (CXXCtorInitializer *Value 2808 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2809 Info.AllToInit.push_back(Value); 2810 } else if (!AnyErrors) { 2811 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2812 CXXCtorInitializer *CXXBaseInit; 2813 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2814 VBase, IsInheritedVirtualBase, 2815 CXXBaseInit)) { 2816 HadError = true; 2817 continue; 2818 } 2819 2820 Info.AllToInit.push_back(CXXBaseInit); 2821 } 2822 } 2823 2824 // Non-virtual bases. 2825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2826 E = ClassDecl->bases_end(); Base != E; ++Base) { 2827 // Virtuals are in the virtual base list and already constructed. 2828 if (Base->isVirtual()) 2829 continue; 2830 2831 if (CXXCtorInitializer *Value 2832 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2833 Info.AllToInit.push_back(Value); 2834 } else if (!AnyErrors) { 2835 CXXCtorInitializer *CXXBaseInit; 2836 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2837 Base, /*IsInheritedVirtualBase=*/false, 2838 CXXBaseInit)) { 2839 HadError = true; 2840 continue; 2841 } 2842 2843 Info.AllToInit.push_back(CXXBaseInit); 2844 } 2845 } 2846 2847 // Fields. 2848 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2849 MemEnd = ClassDecl->decls_end(); 2850 Mem != MemEnd; ++Mem) { 2851 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2852 // C++ [class.bit]p2: 2853 // A declaration for a bit-field that omits the identifier declares an 2854 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2855 // initialized. 2856 if (F->isUnnamedBitfield()) 2857 continue; 2858 2859 // If we're not generating the implicit copy/move constructor, then we'll 2860 // handle anonymous struct/union fields based on their individual 2861 // indirect fields. 2862 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2863 continue; 2864 2865 if (CollectFieldInitializer(*this, Info, F)) 2866 HadError = true; 2867 continue; 2868 } 2869 2870 // Beyond this point, we only consider default initialization. 2871 if (Info.IIK != IIK_Default) 2872 continue; 2873 2874 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2875 if (F->getType()->isIncompleteArrayType()) { 2876 assert(ClassDecl->hasFlexibleArrayMember() && 2877 "Incomplete array type is not valid"); 2878 continue; 2879 } 2880 2881 // Initialize each field of an anonymous struct individually. 2882 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2883 HadError = true; 2884 2885 continue; 2886 } 2887 } 2888 2889 NumInitializers = Info.AllToInit.size(); 2890 if (NumInitializers > 0) { 2891 Constructor->setNumCtorInitializers(NumInitializers); 2892 CXXCtorInitializer **baseOrMemberInitializers = 2893 new (Context) CXXCtorInitializer*[NumInitializers]; 2894 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2895 NumInitializers * sizeof(CXXCtorInitializer*)); 2896 Constructor->setCtorInitializers(baseOrMemberInitializers); 2897 2898 // Constructors implicitly reference the base and member 2899 // destructors. 2900 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2901 Constructor->getParent()); 2902 } 2903 2904 return HadError; 2905} 2906 2907static void *GetKeyForTopLevelField(FieldDecl *Field) { 2908 // For anonymous unions, use the class declaration as the key. 2909 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2910 if (RT->getDecl()->isAnonymousStructOrUnion()) 2911 return static_cast<void *>(RT->getDecl()); 2912 } 2913 return static_cast<void *>(Field); 2914} 2915 2916static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2917 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2918} 2919 2920static void *GetKeyForMember(ASTContext &Context, 2921 CXXCtorInitializer *Member) { 2922 if (!Member->isAnyMemberInitializer()) 2923 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2924 2925 // For fields injected into the class via declaration of an anonymous union, 2926 // use its anonymous union class declaration as the unique key. 2927 FieldDecl *Field = Member->getAnyMember(); 2928 2929 // If the field is a member of an anonymous struct or union, our key 2930 // is the anonymous record decl that's a direct child of the class. 2931 RecordDecl *RD = Field->getParent(); 2932 if (RD->isAnonymousStructOrUnion()) { 2933 while (true) { 2934 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2935 if (Parent->isAnonymousStructOrUnion()) 2936 RD = Parent; 2937 else 2938 break; 2939 } 2940 2941 return static_cast<void *>(RD); 2942 } 2943 2944 return static_cast<void *>(Field); 2945} 2946 2947static void 2948DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2949 const CXXConstructorDecl *Constructor, 2950 CXXCtorInitializer **Inits, 2951 unsigned NumInits) { 2952 if (Constructor->getDeclContext()->isDependentContext()) 2953 return; 2954 2955 // Don't check initializers order unless the warning is enabled at the 2956 // location of at least one initializer. 2957 bool ShouldCheckOrder = false; 2958 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2959 CXXCtorInitializer *Init = Inits[InitIndex]; 2960 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2961 Init->getSourceLocation()) 2962 != DiagnosticsEngine::Ignored) { 2963 ShouldCheckOrder = true; 2964 break; 2965 } 2966 } 2967 if (!ShouldCheckOrder) 2968 return; 2969 2970 // Build the list of bases and members in the order that they'll 2971 // actually be initialized. The explicit initializers should be in 2972 // this same order but may be missing things. 2973 SmallVector<const void*, 32> IdealInitKeys; 2974 2975 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2976 2977 // 1. Virtual bases. 2978 for (CXXRecordDecl::base_class_const_iterator VBase = 2979 ClassDecl->vbases_begin(), 2980 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2981 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2982 2983 // 2. Non-virtual bases. 2984 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2985 E = ClassDecl->bases_end(); Base != E; ++Base) { 2986 if (Base->isVirtual()) 2987 continue; 2988 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2989 } 2990 2991 // 3. Direct fields. 2992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2993 E = ClassDecl->field_end(); Field != E; ++Field) { 2994 if (Field->isUnnamedBitfield()) 2995 continue; 2996 2997 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2998 } 2999 3000 unsigned NumIdealInits = IdealInitKeys.size(); 3001 unsigned IdealIndex = 0; 3002 3003 CXXCtorInitializer *PrevInit = 0; 3004 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3005 CXXCtorInitializer *Init = Inits[InitIndex]; 3006 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3007 3008 // Scan forward to try to find this initializer in the idealized 3009 // initializers list. 3010 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3011 if (InitKey == IdealInitKeys[IdealIndex]) 3012 break; 3013 3014 // If we didn't find this initializer, it must be because we 3015 // scanned past it on a previous iteration. That can only 3016 // happen if we're out of order; emit a warning. 3017 if (IdealIndex == NumIdealInits && PrevInit) { 3018 Sema::SemaDiagnosticBuilder D = 3019 SemaRef.Diag(PrevInit->getSourceLocation(), 3020 diag::warn_initializer_out_of_order); 3021 3022 if (PrevInit->isAnyMemberInitializer()) 3023 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3024 else 3025 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3026 3027 if (Init->isAnyMemberInitializer()) 3028 D << 0 << Init->getAnyMember()->getDeclName(); 3029 else 3030 D << 1 << Init->getTypeSourceInfo()->getType(); 3031 3032 // Move back to the initializer's location in the ideal list. 3033 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3034 if (InitKey == IdealInitKeys[IdealIndex]) 3035 break; 3036 3037 assert(IdealIndex != NumIdealInits && 3038 "initializer not found in initializer list"); 3039 } 3040 3041 PrevInit = Init; 3042 } 3043} 3044 3045namespace { 3046bool CheckRedundantInit(Sema &S, 3047 CXXCtorInitializer *Init, 3048 CXXCtorInitializer *&PrevInit) { 3049 if (!PrevInit) { 3050 PrevInit = Init; 3051 return false; 3052 } 3053 3054 if (FieldDecl *Field = Init->getMember()) 3055 S.Diag(Init->getSourceLocation(), 3056 diag::err_multiple_mem_initialization) 3057 << Field->getDeclName() 3058 << Init->getSourceRange(); 3059 else { 3060 const Type *BaseClass = Init->getBaseClass(); 3061 assert(BaseClass && "neither field nor base"); 3062 S.Diag(Init->getSourceLocation(), 3063 diag::err_multiple_base_initialization) 3064 << QualType(BaseClass, 0) 3065 << Init->getSourceRange(); 3066 } 3067 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3068 << 0 << PrevInit->getSourceRange(); 3069 3070 return true; 3071} 3072 3073typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3074typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3075 3076bool CheckRedundantUnionInit(Sema &S, 3077 CXXCtorInitializer *Init, 3078 RedundantUnionMap &Unions) { 3079 FieldDecl *Field = Init->getAnyMember(); 3080 RecordDecl *Parent = Field->getParent(); 3081 NamedDecl *Child = Field; 3082 3083 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3084 if (Parent->isUnion()) { 3085 UnionEntry &En = Unions[Parent]; 3086 if (En.first && En.first != Child) { 3087 S.Diag(Init->getSourceLocation(), 3088 diag::err_multiple_mem_union_initialization) 3089 << Field->getDeclName() 3090 << Init->getSourceRange(); 3091 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3092 << 0 << En.second->getSourceRange(); 3093 return true; 3094 } 3095 if (!En.first) { 3096 En.first = Child; 3097 En.second = Init; 3098 } 3099 if (!Parent->isAnonymousStructOrUnion()) 3100 return false; 3101 } 3102 3103 Child = Parent; 3104 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3105 } 3106 3107 return false; 3108} 3109} 3110 3111/// ActOnMemInitializers - Handle the member initializers for a constructor. 3112void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3113 SourceLocation ColonLoc, 3114 CXXCtorInitializer **meminits, 3115 unsigned NumMemInits, 3116 bool AnyErrors) { 3117 if (!ConstructorDecl) 3118 return; 3119 3120 AdjustDeclIfTemplate(ConstructorDecl); 3121 3122 CXXConstructorDecl *Constructor 3123 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3124 3125 if (!Constructor) { 3126 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3127 return; 3128 } 3129 3130 CXXCtorInitializer **MemInits = 3131 reinterpret_cast<CXXCtorInitializer **>(meminits); 3132 3133 // Mapping for the duplicate initializers check. 3134 // For member initializers, this is keyed with a FieldDecl*. 3135 // For base initializers, this is keyed with a Type*. 3136 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3137 3138 // Mapping for the inconsistent anonymous-union initializers check. 3139 RedundantUnionMap MemberUnions; 3140 3141 bool HadError = false; 3142 for (unsigned i = 0; i < NumMemInits; i++) { 3143 CXXCtorInitializer *Init = MemInits[i]; 3144 3145 // Set the source order index. 3146 Init->setSourceOrder(i); 3147 3148 if (Init->isAnyMemberInitializer()) { 3149 FieldDecl *Field = Init->getAnyMember(); 3150 if (CheckRedundantInit(*this, Init, Members[Field]) || 3151 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3152 HadError = true; 3153 } else if (Init->isBaseInitializer()) { 3154 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3155 if (CheckRedundantInit(*this, Init, Members[Key])) 3156 HadError = true; 3157 } else { 3158 assert(Init->isDelegatingInitializer()); 3159 // This must be the only initializer 3160 if (i != 0 || NumMemInits > 1) { 3161 Diag(MemInits[0]->getSourceLocation(), 3162 diag::err_delegating_initializer_alone) 3163 << MemInits[0]->getSourceRange(); 3164 HadError = true; 3165 // We will treat this as being the only initializer. 3166 } 3167 SetDelegatingInitializer(Constructor, MemInits[i]); 3168 // Return immediately as the initializer is set. 3169 return; 3170 } 3171 } 3172 3173 if (HadError) 3174 return; 3175 3176 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3177 3178 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3179} 3180 3181void 3182Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3183 CXXRecordDecl *ClassDecl) { 3184 // Ignore dependent contexts. Also ignore unions, since their members never 3185 // have destructors implicitly called. 3186 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3187 return; 3188 3189 // FIXME: all the access-control diagnostics are positioned on the 3190 // field/base declaration. That's probably good; that said, the 3191 // user might reasonably want to know why the destructor is being 3192 // emitted, and we currently don't say. 3193 3194 // Non-static data members. 3195 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3196 E = ClassDecl->field_end(); I != E; ++I) { 3197 FieldDecl *Field = *I; 3198 if (Field->isInvalidDecl()) 3199 continue; 3200 3201 // Don't destroy incomplete or zero-length arrays. 3202 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3203 continue; 3204 3205 QualType FieldType = Context.getBaseElementType(Field->getType()); 3206 3207 const RecordType* RT = FieldType->getAs<RecordType>(); 3208 if (!RT) 3209 continue; 3210 3211 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3212 if (FieldClassDecl->isInvalidDecl()) 3213 continue; 3214 if (FieldClassDecl->hasTrivialDestructor()) 3215 continue; 3216 3217 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3218 assert(Dtor && "No dtor found for FieldClassDecl!"); 3219 CheckDestructorAccess(Field->getLocation(), Dtor, 3220 PDiag(diag::err_access_dtor_field) 3221 << Field->getDeclName() 3222 << FieldType); 3223 3224 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3225 } 3226 3227 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3228 3229 // Bases. 3230 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3231 E = ClassDecl->bases_end(); Base != E; ++Base) { 3232 // Bases are always records in a well-formed non-dependent class. 3233 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3234 3235 // Remember direct virtual bases. 3236 if (Base->isVirtual()) 3237 DirectVirtualBases.insert(RT); 3238 3239 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3240 // If our base class is invalid, we probably can't get its dtor anyway. 3241 if (BaseClassDecl->isInvalidDecl()) 3242 continue; 3243 // Ignore trivial destructors. 3244 if (BaseClassDecl->hasTrivialDestructor()) 3245 continue; 3246 3247 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3248 assert(Dtor && "No dtor found for BaseClassDecl!"); 3249 3250 // FIXME: caret should be on the start of the class name 3251 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3252 PDiag(diag::err_access_dtor_base) 3253 << Base->getType() 3254 << Base->getSourceRange()); 3255 3256 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3257 } 3258 3259 // Virtual bases. 3260 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3261 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3262 3263 // Bases are always records in a well-formed non-dependent class. 3264 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3265 3266 // Ignore direct virtual bases. 3267 if (DirectVirtualBases.count(RT)) 3268 continue; 3269 3270 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3271 // If our base class is invalid, we probably can't get its dtor anyway. 3272 if (BaseClassDecl->isInvalidDecl()) 3273 continue; 3274 // Ignore trivial destructors. 3275 if (BaseClassDecl->hasTrivialDestructor()) 3276 continue; 3277 3278 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3279 assert(Dtor && "No dtor found for BaseClassDecl!"); 3280 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3281 PDiag(diag::err_access_dtor_vbase) 3282 << VBase->getType()); 3283 3284 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3285 } 3286} 3287 3288void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3289 if (!CDtorDecl) 3290 return; 3291 3292 if (CXXConstructorDecl *Constructor 3293 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3294 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3295} 3296 3297bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3298 unsigned DiagID, AbstractDiagSelID SelID) { 3299 if (SelID == -1) 3300 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3301 else 3302 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3303} 3304 3305bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3306 const PartialDiagnostic &PD) { 3307 if (!getLangOptions().CPlusPlus) 3308 return false; 3309 3310 if (const ArrayType *AT = Context.getAsArrayType(T)) 3311 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3312 3313 if (const PointerType *PT = T->getAs<PointerType>()) { 3314 // Find the innermost pointer type. 3315 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3316 PT = T; 3317 3318 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3319 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3320 } 3321 3322 const RecordType *RT = T->getAs<RecordType>(); 3323 if (!RT) 3324 return false; 3325 3326 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3327 3328 // We can't answer whether something is abstract until it has a 3329 // definition. If it's currently being defined, we'll walk back 3330 // over all the declarations when we have a full definition. 3331 const CXXRecordDecl *Def = RD->getDefinition(); 3332 if (!Def || Def->isBeingDefined()) 3333 return false; 3334 3335 if (!RD->isAbstract()) 3336 return false; 3337 3338 Diag(Loc, PD) << RD->getDeclName(); 3339 DiagnoseAbstractType(RD); 3340 3341 return true; 3342} 3343 3344void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3345 // Check if we've already emitted the list of pure virtual functions 3346 // for this class. 3347 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3348 return; 3349 3350 CXXFinalOverriderMap FinalOverriders; 3351 RD->getFinalOverriders(FinalOverriders); 3352 3353 // Keep a set of seen pure methods so we won't diagnose the same method 3354 // more than once. 3355 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3356 3357 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3358 MEnd = FinalOverriders.end(); 3359 M != MEnd; 3360 ++M) { 3361 for (OverridingMethods::iterator SO = M->second.begin(), 3362 SOEnd = M->second.end(); 3363 SO != SOEnd; ++SO) { 3364 // C++ [class.abstract]p4: 3365 // A class is abstract if it contains or inherits at least one 3366 // pure virtual function for which the final overrider is pure 3367 // virtual. 3368 3369 // 3370 if (SO->second.size() != 1) 3371 continue; 3372 3373 if (!SO->second.front().Method->isPure()) 3374 continue; 3375 3376 if (!SeenPureMethods.insert(SO->second.front().Method)) 3377 continue; 3378 3379 Diag(SO->second.front().Method->getLocation(), 3380 diag::note_pure_virtual_function) 3381 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3382 } 3383 } 3384 3385 if (!PureVirtualClassDiagSet) 3386 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3387 PureVirtualClassDiagSet->insert(RD); 3388} 3389 3390namespace { 3391struct AbstractUsageInfo { 3392 Sema &S; 3393 CXXRecordDecl *Record; 3394 CanQualType AbstractType; 3395 bool Invalid; 3396 3397 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3398 : S(S), Record(Record), 3399 AbstractType(S.Context.getCanonicalType( 3400 S.Context.getTypeDeclType(Record))), 3401 Invalid(false) {} 3402 3403 void DiagnoseAbstractType() { 3404 if (Invalid) return; 3405 S.DiagnoseAbstractType(Record); 3406 Invalid = true; 3407 } 3408 3409 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3410}; 3411 3412struct CheckAbstractUsage { 3413 AbstractUsageInfo &Info; 3414 const NamedDecl *Ctx; 3415 3416 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3417 : Info(Info), Ctx(Ctx) {} 3418 3419 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3420 switch (TL.getTypeLocClass()) { 3421#define ABSTRACT_TYPELOC(CLASS, PARENT) 3422#define TYPELOC(CLASS, PARENT) \ 3423 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3424#include "clang/AST/TypeLocNodes.def" 3425 } 3426 } 3427 3428 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3429 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3430 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3431 if (!TL.getArg(I)) 3432 continue; 3433 3434 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3435 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3436 } 3437 } 3438 3439 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3440 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3441 } 3442 3443 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3444 // Visit the type parameters from a permissive context. 3445 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3446 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3447 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3448 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3449 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3450 // TODO: other template argument types? 3451 } 3452 } 3453 3454 // Visit pointee types from a permissive context. 3455#define CheckPolymorphic(Type) \ 3456 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3457 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3458 } 3459 CheckPolymorphic(PointerTypeLoc) 3460 CheckPolymorphic(ReferenceTypeLoc) 3461 CheckPolymorphic(MemberPointerTypeLoc) 3462 CheckPolymorphic(BlockPointerTypeLoc) 3463 CheckPolymorphic(AtomicTypeLoc) 3464 3465 /// Handle all the types we haven't given a more specific 3466 /// implementation for above. 3467 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3468 // Every other kind of type that we haven't called out already 3469 // that has an inner type is either (1) sugar or (2) contains that 3470 // inner type in some way as a subobject. 3471 if (TypeLoc Next = TL.getNextTypeLoc()) 3472 return Visit(Next, Sel); 3473 3474 // If there's no inner type and we're in a permissive context, 3475 // don't diagnose. 3476 if (Sel == Sema::AbstractNone) return; 3477 3478 // Check whether the type matches the abstract type. 3479 QualType T = TL.getType(); 3480 if (T->isArrayType()) { 3481 Sel = Sema::AbstractArrayType; 3482 T = Info.S.Context.getBaseElementType(T); 3483 } 3484 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3485 if (CT != Info.AbstractType) return; 3486 3487 // It matched; do some magic. 3488 if (Sel == Sema::AbstractArrayType) { 3489 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3490 << T << TL.getSourceRange(); 3491 } else { 3492 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3493 << Sel << T << TL.getSourceRange(); 3494 } 3495 Info.DiagnoseAbstractType(); 3496 } 3497}; 3498 3499void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3500 Sema::AbstractDiagSelID Sel) { 3501 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3502} 3503 3504} 3505 3506/// Check for invalid uses of an abstract type in a method declaration. 3507static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3508 CXXMethodDecl *MD) { 3509 // No need to do the check on definitions, which require that 3510 // the return/param types be complete. 3511 if (MD->doesThisDeclarationHaveABody()) 3512 return; 3513 3514 // For safety's sake, just ignore it if we don't have type source 3515 // information. This should never happen for non-implicit methods, 3516 // but... 3517 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3518 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3519} 3520 3521/// Check for invalid uses of an abstract type within a class definition. 3522static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3523 CXXRecordDecl *RD) { 3524 for (CXXRecordDecl::decl_iterator 3525 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3526 Decl *D = *I; 3527 if (D->isImplicit()) continue; 3528 3529 // Methods and method templates. 3530 if (isa<CXXMethodDecl>(D)) { 3531 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3532 } else if (isa<FunctionTemplateDecl>(D)) { 3533 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3534 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3535 3536 // Fields and static variables. 3537 } else if (isa<FieldDecl>(D)) { 3538 FieldDecl *FD = cast<FieldDecl>(D); 3539 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3540 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3541 } else if (isa<VarDecl>(D)) { 3542 VarDecl *VD = cast<VarDecl>(D); 3543 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3544 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3545 3546 // Nested classes and class templates. 3547 } else if (isa<CXXRecordDecl>(D)) { 3548 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3549 } else if (isa<ClassTemplateDecl>(D)) { 3550 CheckAbstractClassUsage(Info, 3551 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3552 } 3553 } 3554} 3555 3556/// \brief Perform semantic checks on a class definition that has been 3557/// completing, introducing implicitly-declared members, checking for 3558/// abstract types, etc. 3559void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3560 if (!Record) 3561 return; 3562 3563 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3564 AbstractUsageInfo Info(*this, Record); 3565 CheckAbstractClassUsage(Info, Record); 3566 } 3567 3568 // If this is not an aggregate type and has no user-declared constructor, 3569 // complain about any non-static data members of reference or const scalar 3570 // type, since they will never get initializers. 3571 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3572 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3573 bool Complained = false; 3574 for (RecordDecl::field_iterator F = Record->field_begin(), 3575 FEnd = Record->field_end(); 3576 F != FEnd; ++F) { 3577 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3578 continue; 3579 3580 if (F->getType()->isReferenceType() || 3581 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3582 if (!Complained) { 3583 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3584 << Record->getTagKind() << Record; 3585 Complained = true; 3586 } 3587 3588 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3589 << F->getType()->isReferenceType() 3590 << F->getDeclName(); 3591 } 3592 } 3593 } 3594 3595 if (Record->isDynamicClass() && !Record->isDependentType()) 3596 DynamicClasses.push_back(Record); 3597 3598 if (Record->getIdentifier()) { 3599 // C++ [class.mem]p13: 3600 // If T is the name of a class, then each of the following shall have a 3601 // name different from T: 3602 // - every member of every anonymous union that is a member of class T. 3603 // 3604 // C++ [class.mem]p14: 3605 // In addition, if class T has a user-declared constructor (12.1), every 3606 // non-static data member of class T shall have a name different from T. 3607 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3608 R.first != R.second; ++R.first) { 3609 NamedDecl *D = *R.first; 3610 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3611 isa<IndirectFieldDecl>(D)) { 3612 Diag(D->getLocation(), diag::err_member_name_of_class) 3613 << D->getDeclName(); 3614 break; 3615 } 3616 } 3617 } 3618 3619 // Warn if the class has virtual methods but non-virtual public destructor. 3620 if (Record->isPolymorphic() && !Record->isDependentType()) { 3621 CXXDestructorDecl *dtor = Record->getDestructor(); 3622 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3623 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3624 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3625 } 3626 3627 // See if a method overloads virtual methods in a base 3628 /// class without overriding any. 3629 if (!Record->isDependentType()) { 3630 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3631 MEnd = Record->method_end(); 3632 M != MEnd; ++M) { 3633 if (!(*M)->isStatic()) 3634 DiagnoseHiddenVirtualMethods(Record, *M); 3635 } 3636 } 3637 3638 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3639 // function that is not a constructor declares that member function to be 3640 // const. [...] The class of which that function is a member shall be 3641 // a literal type. 3642 // 3643 // It's fine to diagnose constructors here too: such constructors cannot 3644 // produce a constant expression, so are ill-formed (no diagnostic required). 3645 // 3646 // If the class has virtual bases, any constexpr members will already have 3647 // been diagnosed by the checks performed on the member declaration, so 3648 // suppress this (less useful) diagnostic. 3649 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3650 !Record->isLiteral() && !Record->getNumVBases()) { 3651 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3652 MEnd = Record->method_end(); 3653 M != MEnd; ++M) { 3654 if ((*M)->isConstexpr()) { 3655 switch (Record->getTemplateSpecializationKind()) { 3656 case TSK_ImplicitInstantiation: 3657 case TSK_ExplicitInstantiationDeclaration: 3658 case TSK_ExplicitInstantiationDefinition: 3659 // If a template instantiates to a non-literal type, but its members 3660 // instantiate to constexpr functions, the template is technically 3661 // ill-formed, but we allow it for sanity. Such members are treated as 3662 // non-constexpr. 3663 (*M)->setConstexpr(false); 3664 continue; 3665 3666 case TSK_Undeclared: 3667 case TSK_ExplicitSpecialization: 3668 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3669 PDiag(diag::err_constexpr_method_non_literal)); 3670 break; 3671 } 3672 3673 // Only produce one error per class. 3674 break; 3675 } 3676 } 3677 } 3678 3679 // Declare inherited constructors. We do this eagerly here because: 3680 // - The standard requires an eager diagnostic for conflicting inherited 3681 // constructors from different classes. 3682 // - The lazy declaration of the other implicit constructors is so as to not 3683 // waste space and performance on classes that are not meant to be 3684 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3685 // have inherited constructors. 3686 DeclareInheritedConstructors(Record); 3687 3688 if (!Record->isDependentType()) 3689 CheckExplicitlyDefaultedMethods(Record); 3690} 3691 3692void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3693 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3694 ME = Record->method_end(); 3695 MI != ME; ++MI) { 3696 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3697 switch (getSpecialMember(*MI)) { 3698 case CXXDefaultConstructor: 3699 CheckExplicitlyDefaultedDefaultConstructor( 3700 cast<CXXConstructorDecl>(*MI)); 3701 break; 3702 3703 case CXXDestructor: 3704 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3705 break; 3706 3707 case CXXCopyConstructor: 3708 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3709 break; 3710 3711 case CXXCopyAssignment: 3712 CheckExplicitlyDefaultedCopyAssignment(*MI); 3713 break; 3714 3715 case CXXMoveConstructor: 3716 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3717 break; 3718 3719 case CXXMoveAssignment: 3720 CheckExplicitlyDefaultedMoveAssignment(*MI); 3721 break; 3722 3723 case CXXInvalid: 3724 llvm_unreachable("non-special member explicitly defaulted!"); 3725 } 3726 } 3727 } 3728 3729} 3730 3731void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3732 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3733 3734 // Whether this was the first-declared instance of the constructor. 3735 // This affects whether we implicitly add an exception spec (and, eventually, 3736 // constexpr). It is also ill-formed to explicitly default a constructor such 3737 // that it would be deleted. (C++0x [decl.fct.def.default]) 3738 bool First = CD == CD->getCanonicalDecl(); 3739 3740 bool HadError = false; 3741 if (CD->getNumParams() != 0) { 3742 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3743 << CD->getSourceRange(); 3744 HadError = true; 3745 } 3746 3747 ImplicitExceptionSpecification Spec 3748 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3749 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3750 if (EPI.ExceptionSpecType == EST_Delayed) { 3751 // Exception specification depends on some deferred part of the class. We'll 3752 // try again when the class's definition has been fully processed. 3753 return; 3754 } 3755 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3756 *ExceptionType = Context.getFunctionType( 3757 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3758 3759 // C++11 [dcl.fct.def.default]p2: 3760 // An explicitly-defaulted function may be declared constexpr only if it 3761 // would have been implicitly declared as constexpr, 3762 if (CD->isConstexpr()) { 3763 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3764 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3765 << CXXDefaultConstructor; 3766 HadError = true; 3767 } 3768 } 3769 // and may have an explicit exception-specification only if it is compatible 3770 // with the exception-specification on the implicit declaration. 3771 if (CtorType->hasExceptionSpec()) { 3772 if (CheckEquivalentExceptionSpec( 3773 PDiag(diag::err_incorrect_defaulted_exception_spec) 3774 << CXXDefaultConstructor, 3775 PDiag(), 3776 ExceptionType, SourceLocation(), 3777 CtorType, CD->getLocation())) { 3778 HadError = true; 3779 } 3780 } 3781 3782 // If a function is explicitly defaulted on its first declaration, 3783 if (First) { 3784 // -- it is implicitly considered to be constexpr if the implicit 3785 // definition would be, 3786 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3787 3788 // -- it is implicitly considered to have the same 3789 // exception-specification as if it had been implicitly declared 3790 // 3791 // FIXME: a compatible, but different, explicit exception specification 3792 // will be silently overridden. We should issue a warning if this happens. 3793 EPI.ExtInfo = CtorType->getExtInfo(); 3794 } 3795 3796 if (HadError) { 3797 CD->setInvalidDecl(); 3798 return; 3799 } 3800 3801 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3802 if (First) { 3803 CD->setDeletedAsWritten(); 3804 } else { 3805 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3806 << CXXDefaultConstructor; 3807 CD->setInvalidDecl(); 3808 } 3809 } 3810} 3811 3812void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3813 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3814 3815 // Whether this was the first-declared instance of the constructor. 3816 bool First = CD == CD->getCanonicalDecl(); 3817 3818 bool HadError = false; 3819 if (CD->getNumParams() != 1) { 3820 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3821 << CD->getSourceRange(); 3822 HadError = true; 3823 } 3824 3825 ImplicitExceptionSpecification Spec(Context); 3826 bool Const; 3827 llvm::tie(Spec, Const) = 3828 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3829 3830 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3831 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3832 *ExceptionType = Context.getFunctionType( 3833 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3834 3835 // Check for parameter type matching. 3836 // This is a copy ctor so we know it's a cv-qualified reference to T. 3837 QualType ArgType = CtorType->getArgType(0); 3838 if (ArgType->getPointeeType().isVolatileQualified()) { 3839 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3840 HadError = true; 3841 } 3842 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3843 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3844 HadError = true; 3845 } 3846 3847 // C++11 [dcl.fct.def.default]p2: 3848 // An explicitly-defaulted function may be declared constexpr only if it 3849 // would have been implicitly declared as constexpr, 3850 if (CD->isConstexpr()) { 3851 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3852 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3853 << CXXCopyConstructor; 3854 HadError = true; 3855 } 3856 } 3857 // and may have an explicit exception-specification only if it is compatible 3858 // with the exception-specification on the implicit declaration. 3859 if (CtorType->hasExceptionSpec()) { 3860 if (CheckEquivalentExceptionSpec( 3861 PDiag(diag::err_incorrect_defaulted_exception_spec) 3862 << CXXCopyConstructor, 3863 PDiag(), 3864 ExceptionType, SourceLocation(), 3865 CtorType, CD->getLocation())) { 3866 HadError = true; 3867 } 3868 } 3869 3870 // If a function is explicitly defaulted on its first declaration, 3871 if (First) { 3872 // -- it is implicitly considered to be constexpr if the implicit 3873 // definition would be, 3874 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3875 3876 // -- it is implicitly considered to have the same 3877 // exception-specification as if it had been implicitly declared, and 3878 // 3879 // FIXME: a compatible, but different, explicit exception specification 3880 // will be silently overridden. We should issue a warning if this happens. 3881 EPI.ExtInfo = CtorType->getExtInfo(); 3882 3883 // -- [...] it shall have the same parameter type as if it had been 3884 // implicitly declared. 3885 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3886 } 3887 3888 if (HadError) { 3889 CD->setInvalidDecl(); 3890 return; 3891 } 3892 3893 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3894 if (First) { 3895 CD->setDeletedAsWritten(); 3896 } else { 3897 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3898 << CXXCopyConstructor; 3899 CD->setInvalidDecl(); 3900 } 3901 } 3902} 3903 3904void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3905 assert(MD->isExplicitlyDefaulted()); 3906 3907 // Whether this was the first-declared instance of the operator 3908 bool First = MD == MD->getCanonicalDecl(); 3909 3910 bool HadError = false; 3911 if (MD->getNumParams() != 1) { 3912 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3913 << MD->getSourceRange(); 3914 HadError = true; 3915 } 3916 3917 QualType ReturnType = 3918 MD->getType()->getAs<FunctionType>()->getResultType(); 3919 if (!ReturnType->isLValueReferenceType() || 3920 !Context.hasSameType( 3921 Context.getCanonicalType(ReturnType->getPointeeType()), 3922 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3923 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3924 HadError = true; 3925 } 3926 3927 ImplicitExceptionSpecification Spec(Context); 3928 bool Const; 3929 llvm::tie(Spec, Const) = 3930 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3931 3932 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3933 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3934 *ExceptionType = Context.getFunctionType( 3935 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3936 3937 QualType ArgType = OperType->getArgType(0); 3938 if (!ArgType->isLValueReferenceType()) { 3939 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3940 HadError = true; 3941 } else { 3942 if (ArgType->getPointeeType().isVolatileQualified()) { 3943 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3944 HadError = true; 3945 } 3946 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3947 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3948 HadError = true; 3949 } 3950 } 3951 3952 if (OperType->getTypeQuals()) { 3953 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3954 HadError = true; 3955 } 3956 3957 if (OperType->hasExceptionSpec()) { 3958 if (CheckEquivalentExceptionSpec( 3959 PDiag(diag::err_incorrect_defaulted_exception_spec) 3960 << CXXCopyAssignment, 3961 PDiag(), 3962 ExceptionType, SourceLocation(), 3963 OperType, MD->getLocation())) { 3964 HadError = true; 3965 } 3966 } 3967 if (First) { 3968 // We set the declaration to have the computed exception spec here. 3969 // We duplicate the one parameter type. 3970 EPI.RefQualifier = OperType->getRefQualifier(); 3971 EPI.ExtInfo = OperType->getExtInfo(); 3972 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3973 } 3974 3975 if (HadError) { 3976 MD->setInvalidDecl(); 3977 return; 3978 } 3979 3980 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3981 if (First) { 3982 MD->setDeletedAsWritten(); 3983 } else { 3984 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3985 << CXXCopyAssignment; 3986 MD->setInvalidDecl(); 3987 } 3988 } 3989} 3990 3991void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3992 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3993 3994 // Whether this was the first-declared instance of the constructor. 3995 bool First = CD == CD->getCanonicalDecl(); 3996 3997 bool HadError = false; 3998 if (CD->getNumParams() != 1) { 3999 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4000 << CD->getSourceRange(); 4001 HadError = true; 4002 } 4003 4004 ImplicitExceptionSpecification Spec( 4005 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4006 4007 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4008 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4009 *ExceptionType = Context.getFunctionType( 4010 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4011 4012 // Check for parameter type matching. 4013 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4014 QualType ArgType = CtorType->getArgType(0); 4015 if (ArgType->getPointeeType().isVolatileQualified()) { 4016 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4017 HadError = true; 4018 } 4019 if (ArgType->getPointeeType().isConstQualified()) { 4020 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4021 HadError = true; 4022 } 4023 4024 // C++11 [dcl.fct.def.default]p2: 4025 // An explicitly-defaulted function may be declared constexpr only if it 4026 // would have been implicitly declared as constexpr, 4027 if (CD->isConstexpr()) { 4028 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4029 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4030 << CXXMoveConstructor; 4031 HadError = true; 4032 } 4033 } 4034 // and may have an explicit exception-specification only if it is compatible 4035 // with the exception-specification on the implicit declaration. 4036 if (CtorType->hasExceptionSpec()) { 4037 if (CheckEquivalentExceptionSpec( 4038 PDiag(diag::err_incorrect_defaulted_exception_spec) 4039 << CXXMoveConstructor, 4040 PDiag(), 4041 ExceptionType, SourceLocation(), 4042 CtorType, CD->getLocation())) { 4043 HadError = true; 4044 } 4045 } 4046 4047 // If a function is explicitly defaulted on its first declaration, 4048 if (First) { 4049 // -- it is implicitly considered to be constexpr if the implicit 4050 // definition would be, 4051 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4052 4053 // -- it is implicitly considered to have the same 4054 // exception-specification as if it had been implicitly declared, and 4055 // 4056 // FIXME: a compatible, but different, explicit exception specification 4057 // will be silently overridden. We should issue a warning if this happens. 4058 EPI.ExtInfo = CtorType->getExtInfo(); 4059 4060 // -- [...] it shall have the same parameter type as if it had been 4061 // implicitly declared. 4062 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4063 } 4064 4065 if (HadError) { 4066 CD->setInvalidDecl(); 4067 return; 4068 } 4069 4070 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4071 if (First) { 4072 CD->setDeletedAsWritten(); 4073 } else { 4074 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4075 << CXXMoveConstructor; 4076 CD->setInvalidDecl(); 4077 } 4078 } 4079} 4080 4081void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4082 assert(MD->isExplicitlyDefaulted()); 4083 4084 // Whether this was the first-declared instance of the operator 4085 bool First = MD == MD->getCanonicalDecl(); 4086 4087 bool HadError = false; 4088 if (MD->getNumParams() != 1) { 4089 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4090 << MD->getSourceRange(); 4091 HadError = true; 4092 } 4093 4094 QualType ReturnType = 4095 MD->getType()->getAs<FunctionType>()->getResultType(); 4096 if (!ReturnType->isLValueReferenceType() || 4097 !Context.hasSameType( 4098 Context.getCanonicalType(ReturnType->getPointeeType()), 4099 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4100 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4101 HadError = true; 4102 } 4103 4104 ImplicitExceptionSpecification Spec( 4105 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4106 4107 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4108 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4109 *ExceptionType = Context.getFunctionType( 4110 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4111 4112 QualType ArgType = OperType->getArgType(0); 4113 if (!ArgType->isRValueReferenceType()) { 4114 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4115 HadError = true; 4116 } else { 4117 if (ArgType->getPointeeType().isVolatileQualified()) { 4118 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4119 HadError = true; 4120 } 4121 if (ArgType->getPointeeType().isConstQualified()) { 4122 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4123 HadError = true; 4124 } 4125 } 4126 4127 if (OperType->getTypeQuals()) { 4128 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4129 HadError = true; 4130 } 4131 4132 if (OperType->hasExceptionSpec()) { 4133 if (CheckEquivalentExceptionSpec( 4134 PDiag(diag::err_incorrect_defaulted_exception_spec) 4135 << CXXMoveAssignment, 4136 PDiag(), 4137 ExceptionType, SourceLocation(), 4138 OperType, MD->getLocation())) { 4139 HadError = true; 4140 } 4141 } 4142 if (First) { 4143 // We set the declaration to have the computed exception spec here. 4144 // We duplicate the one parameter type. 4145 EPI.RefQualifier = OperType->getRefQualifier(); 4146 EPI.ExtInfo = OperType->getExtInfo(); 4147 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4148 } 4149 4150 if (HadError) { 4151 MD->setInvalidDecl(); 4152 return; 4153 } 4154 4155 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4156 if (First) { 4157 MD->setDeletedAsWritten(); 4158 } else { 4159 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4160 << CXXMoveAssignment; 4161 MD->setInvalidDecl(); 4162 } 4163 } 4164} 4165 4166void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4167 assert(DD->isExplicitlyDefaulted()); 4168 4169 // Whether this was the first-declared instance of the destructor. 4170 bool First = DD == DD->getCanonicalDecl(); 4171 4172 ImplicitExceptionSpecification Spec 4173 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4174 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4175 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4176 *ExceptionType = Context.getFunctionType( 4177 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4178 4179 if (DtorType->hasExceptionSpec()) { 4180 if (CheckEquivalentExceptionSpec( 4181 PDiag(diag::err_incorrect_defaulted_exception_spec) 4182 << CXXDestructor, 4183 PDiag(), 4184 ExceptionType, SourceLocation(), 4185 DtorType, DD->getLocation())) { 4186 DD->setInvalidDecl(); 4187 return; 4188 } 4189 } 4190 if (First) { 4191 // We set the declaration to have the computed exception spec here. 4192 // There are no parameters. 4193 EPI.ExtInfo = DtorType->getExtInfo(); 4194 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4195 } 4196 4197 if (ShouldDeleteDestructor(DD)) { 4198 if (First) { 4199 DD->setDeletedAsWritten(); 4200 } else { 4201 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4202 << CXXDestructor; 4203 DD->setInvalidDecl(); 4204 } 4205 } 4206} 4207 4208/// This function implements the following C++0x paragraphs: 4209/// - [class.ctor]/5 4210/// - [class.copy]/11 4211bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4212 assert(!MD->isInvalidDecl()); 4213 CXXRecordDecl *RD = MD->getParent(); 4214 assert(!RD->isDependentType() && "do deletion after instantiation"); 4215 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4216 return false; 4217 4218 bool IsUnion = RD->isUnion(); 4219 bool IsConstructor = false; 4220 bool IsAssignment = false; 4221 bool IsMove = false; 4222 4223 bool ConstArg = false; 4224 4225 switch (CSM) { 4226 case CXXDefaultConstructor: 4227 IsConstructor = true; 4228 break; 4229 case CXXCopyConstructor: 4230 IsConstructor = true; 4231 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4232 break; 4233 case CXXMoveConstructor: 4234 IsConstructor = true; 4235 IsMove = true; 4236 break; 4237 default: 4238 llvm_unreachable("function only currently implemented for default ctors"); 4239 } 4240 4241 SourceLocation Loc = MD->getLocation(); 4242 4243 // Do access control from the special member function 4244 ContextRAII MethodContext(*this, MD); 4245 4246 bool AllConst = true; 4247 4248 // We do this because we should never actually use an anonymous 4249 // union's constructor. 4250 if (IsUnion && RD->isAnonymousStructOrUnion()) 4251 return false; 4252 4253 // FIXME: We should put some diagnostic logic right into this function. 4254 4255 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4256 BE = RD->bases_end(); 4257 BI != BE; ++BI) { 4258 // We'll handle this one later 4259 if (BI->isVirtual()) 4260 continue; 4261 4262 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4263 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4264 4265 // Unless we have an assignment operator, the base's destructor must 4266 // be accessible and not deleted. 4267 if (!IsAssignment) { 4268 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4269 if (BaseDtor->isDeleted()) 4270 return true; 4271 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4272 AR_accessible) 4273 return true; 4274 } 4275 4276 // Finding the corresponding member in the base should lead to a 4277 // unique, accessible, non-deleted function. If we are doing 4278 // a destructor, we have already checked this case. 4279 if (CSM != CXXDestructor) { 4280 SpecialMemberOverloadResult *SMOR = 4281 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4282 false); 4283 if (!SMOR->hasSuccess()) 4284 return true; 4285 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4286 if (IsConstructor) { 4287 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4288 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4289 PDiag()) != AR_accessible) 4290 return true; 4291 4292 // For a move operation, the corresponding operation must actually 4293 // be a move operation (and not a copy selected by overload 4294 // resolution) unless we are working on a trivially copyable class. 4295 if (IsMove && !BaseCtor->isMoveConstructor() && 4296 !BaseDecl->isTriviallyCopyable()) 4297 return true; 4298 } 4299 } 4300 } 4301 4302 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4303 BE = RD->vbases_end(); 4304 BI != BE; ++BI) { 4305 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4306 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4307 4308 // Unless we have an assignment operator, the base's destructor must 4309 // be accessible and not deleted. 4310 if (!IsAssignment) { 4311 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4312 if (BaseDtor->isDeleted()) 4313 return true; 4314 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4315 AR_accessible) 4316 return true; 4317 } 4318 4319 // Finding the corresponding member in the base should lead to a 4320 // unique, accessible, non-deleted function. 4321 if (CSM != CXXDestructor) { 4322 SpecialMemberOverloadResult *SMOR = 4323 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4324 false); 4325 if (!SMOR->hasSuccess()) 4326 return true; 4327 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4328 if (IsConstructor) { 4329 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4330 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4331 PDiag()) != AR_accessible) 4332 return true; 4333 4334 // For a move operation, the corresponding operation must actually 4335 // be a move operation (and not a copy selected by overload 4336 // resolution) unless we are working on a trivially copyable class. 4337 if (IsMove && !BaseCtor->isMoveConstructor() && 4338 !BaseDecl->isTriviallyCopyable()) 4339 return true; 4340 } 4341 } 4342 } 4343 4344 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4345 FE = RD->field_end(); 4346 FI != FE; ++FI) { 4347 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4348 continue; 4349 4350 QualType FieldType = Context.getBaseElementType(FI->getType()); 4351 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4352 4353 // For a default constructor, all references must be initialized in-class 4354 // and, if a union, it must have a non-const member. 4355 if (CSM == CXXDefaultConstructor) { 4356 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4357 return true; 4358 4359 if (IsUnion && !FieldType.isConstQualified()) 4360 AllConst = false; 4361 // For a copy constructor, data members must not be of rvalue reference 4362 // type. 4363 } else if (CSM == CXXCopyConstructor) { 4364 if (FieldType->isRValueReferenceType()) 4365 return true; 4366 } 4367 4368 if (FieldRecord) { 4369 // For a default constructor, a const member must have a user-provided 4370 // default constructor or else be explicitly initialized. 4371 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4372 !FI->hasInClassInitializer() && 4373 !FieldRecord->hasUserProvidedDefaultConstructor()) 4374 return true; 4375 4376 // Some additional restrictions exist on the variant members. 4377 if (!IsUnion && FieldRecord->isUnion() && 4378 FieldRecord->isAnonymousStructOrUnion()) { 4379 // We're okay to reuse AllConst here since we only care about the 4380 // value otherwise if we're in a union. 4381 AllConst = true; 4382 4383 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4384 UE = FieldRecord->field_end(); 4385 UI != UE; ++UI) { 4386 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4387 CXXRecordDecl *UnionFieldRecord = 4388 UnionFieldType->getAsCXXRecordDecl(); 4389 4390 if (!UnionFieldType.isConstQualified()) 4391 AllConst = false; 4392 4393 if (UnionFieldRecord) { 4394 // FIXME: Checking for accessibility and validity of this 4395 // destructor is technically going beyond the 4396 // standard, but this is believed to be a defect. 4397 if (!IsAssignment) { 4398 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4399 if (FieldDtor->isDeleted()) 4400 return true; 4401 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4402 AR_accessible) 4403 return true; 4404 if (!FieldDtor->isTrivial()) 4405 return true; 4406 } 4407 4408 if (CSM != CXXDestructor) { 4409 SpecialMemberOverloadResult *SMOR = 4410 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4411 false, false, false); 4412 // FIXME: Checking for accessibility and validity of this 4413 // corresponding member is technically going beyond the 4414 // standard, but this is believed to be a defect. 4415 if (!SMOR->hasSuccess()) 4416 return true; 4417 4418 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4419 // A member of a union must have a trivial corresponding 4420 // constructor. 4421 if (!FieldMember->isTrivial()) 4422 return true; 4423 4424 if (IsConstructor) { 4425 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4426 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4427 PDiag()) != AR_accessible) 4428 return true; 4429 } 4430 } 4431 } 4432 } 4433 4434 // At least one member in each anonymous union must be non-const 4435 if (CSM == CXXDefaultConstructor && AllConst) 4436 return true; 4437 4438 // Don't try to initialize the anonymous union 4439 // This is technically non-conformant, but sanity demands it. 4440 continue; 4441 } 4442 4443 // Unless we're doing assignment, the field's destructor must be 4444 // accessible and not deleted. 4445 if (!IsAssignment) { 4446 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4447 if (FieldDtor->isDeleted()) 4448 return true; 4449 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4450 AR_accessible) 4451 return true; 4452 } 4453 4454 // Check that the corresponding member of the field is accessible, 4455 // unique, and non-deleted. We don't do this if it has an explicit 4456 // initialization when default-constructing. 4457 if (CSM != CXXDestructor && 4458 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4459 SpecialMemberOverloadResult *SMOR = 4460 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4461 false); 4462 if (!SMOR->hasSuccess()) 4463 return true; 4464 4465 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4466 if (IsConstructor) { 4467 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4468 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4469 PDiag()) != AR_accessible) 4470 return true; 4471 4472 // For a move operation, the corresponding operation must actually 4473 // be a move operation (and not a copy selected by overload 4474 // resolution) unless we are working on a trivially copyable class. 4475 if (IsMove && !FieldCtor->isMoveConstructor() && 4476 !FieldRecord->isTriviallyCopyable()) 4477 return true; 4478 } 4479 4480 // We need the corresponding member of a union to be trivial so that 4481 // we can safely copy them all simultaneously. 4482 // FIXME: Note that performing the check here (where we rely on the lack 4483 // of an in-class initializer) is technically ill-formed. However, this 4484 // seems most obviously to be a bug in the standard. 4485 if (IsUnion && !FieldMember->isTrivial()) 4486 return true; 4487 } 4488 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4489 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4490 // We can't initialize a const member of non-class type to any value. 4491 return true; 4492 } 4493 } 4494 4495 // We can't have all const members in a union when default-constructing, 4496 // or else they're all nonsensical garbage values that can't be changed. 4497 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4498 return true; 4499 4500 return false; 4501} 4502 4503bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4504 CXXRecordDecl *RD = MD->getParent(); 4505 assert(!RD->isDependentType() && "do deletion after instantiation"); 4506 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4507 return false; 4508 4509 SourceLocation Loc = MD->getLocation(); 4510 4511 // Do access control from the constructor 4512 ContextRAII MethodContext(*this, MD); 4513 4514 bool Union = RD->isUnion(); 4515 4516 unsigned ArgQuals = 4517 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4518 Qualifiers::Const : 0; 4519 4520 // We do this because we should never actually use an anonymous 4521 // union's constructor. 4522 if (Union && RD->isAnonymousStructOrUnion()) 4523 return false; 4524 4525 // FIXME: We should put some diagnostic logic right into this function. 4526 4527 // C++0x [class.copy]/20 4528 // A defaulted [copy] assignment operator for class X is defined as deleted 4529 // if X has: 4530 4531 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4532 BE = RD->bases_end(); 4533 BI != BE; ++BI) { 4534 // We'll handle this one later 4535 if (BI->isVirtual()) 4536 continue; 4537 4538 QualType BaseType = BI->getType(); 4539 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4540 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4541 4542 // -- a [direct base class] B that cannot be [copied] because overload 4543 // resolution, as applied to B's [copy] assignment operator, results in 4544 // an ambiguity or a function that is deleted or inaccessible from the 4545 // assignment operator 4546 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4547 0); 4548 if (!CopyOper || CopyOper->isDeleted()) 4549 return true; 4550 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4551 return true; 4552 } 4553 4554 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4555 BE = RD->vbases_end(); 4556 BI != BE; ++BI) { 4557 QualType BaseType = BI->getType(); 4558 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4559 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4560 4561 // -- a [virtual base class] B that cannot be [copied] because overload 4562 // resolution, as applied to B's [copy] assignment operator, results in 4563 // an ambiguity or a function that is deleted or inaccessible from the 4564 // assignment operator 4565 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4566 0); 4567 if (!CopyOper || CopyOper->isDeleted()) 4568 return true; 4569 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4570 return true; 4571 } 4572 4573 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4574 FE = RD->field_end(); 4575 FI != FE; ++FI) { 4576 if (FI->isUnnamedBitfield()) 4577 continue; 4578 4579 QualType FieldType = Context.getBaseElementType(FI->getType()); 4580 4581 // -- a non-static data member of reference type 4582 if (FieldType->isReferenceType()) 4583 return true; 4584 4585 // -- a non-static data member of const non-class type (or array thereof) 4586 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4587 return true; 4588 4589 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4590 4591 if (FieldRecord) { 4592 // This is an anonymous union 4593 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4594 // Anonymous unions inside unions do not variant members create 4595 if (!Union) { 4596 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4597 UE = FieldRecord->field_end(); 4598 UI != UE; ++UI) { 4599 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4600 CXXRecordDecl *UnionFieldRecord = 4601 UnionFieldType->getAsCXXRecordDecl(); 4602 4603 // -- a variant member with a non-trivial [copy] assignment operator 4604 // and X is a union-like class 4605 if (UnionFieldRecord && 4606 !UnionFieldRecord->hasTrivialCopyAssignment()) 4607 return true; 4608 } 4609 } 4610 4611 // Don't try to initalize an anonymous union 4612 continue; 4613 // -- a variant member with a non-trivial [copy] assignment operator 4614 // and X is a union-like class 4615 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4616 return true; 4617 } 4618 4619 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4620 false, 0); 4621 if (!CopyOper || CopyOper->isDeleted()) 4622 return true; 4623 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4624 return true; 4625 } 4626 } 4627 4628 return false; 4629} 4630 4631bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4632 CXXRecordDecl *RD = MD->getParent(); 4633 assert(!RD->isDependentType() && "do deletion after instantiation"); 4634 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4635 return false; 4636 4637 SourceLocation Loc = MD->getLocation(); 4638 4639 // Do access control from the constructor 4640 ContextRAII MethodContext(*this, MD); 4641 4642 bool Union = RD->isUnion(); 4643 4644 // We do this because we should never actually use an anonymous 4645 // union's constructor. 4646 if (Union && RD->isAnonymousStructOrUnion()) 4647 return false; 4648 4649 // C++0x [class.copy]/20 4650 // A defaulted [move] assignment operator for class X is defined as deleted 4651 // if X has: 4652 4653 // -- for the move constructor, [...] any direct or indirect virtual base 4654 // class. 4655 if (RD->getNumVBases() != 0) 4656 return true; 4657 4658 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4659 BE = RD->bases_end(); 4660 BI != BE; ++BI) { 4661 4662 QualType BaseType = BI->getType(); 4663 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4664 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4665 4666 // -- a [direct base class] B that cannot be [moved] because overload 4667 // resolution, as applied to B's [move] assignment operator, results in 4668 // an ambiguity or a function that is deleted or inaccessible from the 4669 // assignment operator 4670 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4671 if (!MoveOper || MoveOper->isDeleted()) 4672 return true; 4673 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4674 return true; 4675 4676 // -- for the move assignment operator, a [direct base class] with a type 4677 // that does not have a move assignment operator and is not trivially 4678 // copyable. 4679 if (!MoveOper->isMoveAssignmentOperator() && 4680 !BaseDecl->isTriviallyCopyable()) 4681 return true; 4682 } 4683 4684 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4685 FE = RD->field_end(); 4686 FI != FE; ++FI) { 4687 if (FI->isUnnamedBitfield()) 4688 continue; 4689 4690 QualType FieldType = Context.getBaseElementType(FI->getType()); 4691 4692 // -- a non-static data member of reference type 4693 if (FieldType->isReferenceType()) 4694 return true; 4695 4696 // -- a non-static data member of const non-class type (or array thereof) 4697 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4698 return true; 4699 4700 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4701 4702 if (FieldRecord) { 4703 // This is an anonymous union 4704 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4705 // Anonymous unions inside unions do not variant members create 4706 if (!Union) { 4707 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4708 UE = FieldRecord->field_end(); 4709 UI != UE; ++UI) { 4710 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4711 CXXRecordDecl *UnionFieldRecord = 4712 UnionFieldType->getAsCXXRecordDecl(); 4713 4714 // -- a variant member with a non-trivial [move] assignment operator 4715 // and X is a union-like class 4716 if (UnionFieldRecord && 4717 !UnionFieldRecord->hasTrivialMoveAssignment()) 4718 return true; 4719 } 4720 } 4721 4722 // Don't try to initalize an anonymous union 4723 continue; 4724 // -- a variant member with a non-trivial [move] assignment operator 4725 // and X is a union-like class 4726 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4727 return true; 4728 } 4729 4730 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4731 if (!MoveOper || MoveOper->isDeleted()) 4732 return true; 4733 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4734 return true; 4735 4736 // -- for the move assignment operator, a [non-static data member] with a 4737 // type that does not have a move assignment operator and is not 4738 // trivially copyable. 4739 if (!MoveOper->isMoveAssignmentOperator() && 4740 !FieldRecord->isTriviallyCopyable()) 4741 return true; 4742 } 4743 } 4744 4745 return false; 4746} 4747 4748bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4749 CXXRecordDecl *RD = DD->getParent(); 4750 assert(!RD->isDependentType() && "do deletion after instantiation"); 4751 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4752 return false; 4753 4754 SourceLocation Loc = DD->getLocation(); 4755 4756 // Do access control from the destructor 4757 ContextRAII CtorContext(*this, DD); 4758 4759 bool Union = RD->isUnion(); 4760 4761 // We do this because we should never actually use an anonymous 4762 // union's destructor. 4763 if (Union && RD->isAnonymousStructOrUnion()) 4764 return false; 4765 4766 // C++0x [class.dtor]p5 4767 // A defaulted destructor for a class X is defined as deleted if: 4768 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4769 BE = RD->bases_end(); 4770 BI != BE; ++BI) { 4771 // We'll handle this one later 4772 if (BI->isVirtual()) 4773 continue; 4774 4775 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4776 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4777 assert(BaseDtor && "base has no destructor"); 4778 4779 // -- any direct or virtual base class has a deleted destructor or 4780 // a destructor that is inaccessible from the defaulted destructor 4781 if (BaseDtor->isDeleted()) 4782 return true; 4783 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4784 AR_accessible) 4785 return true; 4786 } 4787 4788 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4789 BE = RD->vbases_end(); 4790 BI != BE; ++BI) { 4791 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4792 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4793 assert(BaseDtor && "base has no destructor"); 4794 4795 // -- any direct or virtual base class has a deleted destructor or 4796 // a destructor that is inaccessible from the defaulted destructor 4797 if (BaseDtor->isDeleted()) 4798 return true; 4799 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4800 AR_accessible) 4801 return true; 4802 } 4803 4804 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4805 FE = RD->field_end(); 4806 FI != FE; ++FI) { 4807 QualType FieldType = Context.getBaseElementType(FI->getType()); 4808 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4809 if (FieldRecord) { 4810 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4811 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4812 UE = FieldRecord->field_end(); 4813 UI != UE; ++UI) { 4814 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4815 CXXRecordDecl *UnionFieldRecord = 4816 UnionFieldType->getAsCXXRecordDecl(); 4817 4818 // -- X is a union-like class that has a variant member with a non- 4819 // trivial destructor. 4820 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4821 return true; 4822 } 4823 // Technically we are supposed to do this next check unconditionally. 4824 // But that makes absolutely no sense. 4825 } else { 4826 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4827 4828 // -- any of the non-static data members has class type M (or array 4829 // thereof) and M has a deleted destructor or a destructor that is 4830 // inaccessible from the defaulted destructor 4831 if (FieldDtor->isDeleted()) 4832 return true; 4833 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4834 AR_accessible) 4835 return true; 4836 4837 // -- X is a union-like class that has a variant member with a non- 4838 // trivial destructor. 4839 if (Union && !FieldDtor->isTrivial()) 4840 return true; 4841 } 4842 } 4843 } 4844 4845 if (DD->isVirtual()) { 4846 FunctionDecl *OperatorDelete = 0; 4847 DeclarationName Name = 4848 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4849 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4850 false)) 4851 return true; 4852 } 4853 4854 4855 return false; 4856} 4857 4858/// \brief Data used with FindHiddenVirtualMethod 4859namespace { 4860 struct FindHiddenVirtualMethodData { 4861 Sema *S; 4862 CXXMethodDecl *Method; 4863 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4864 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4865 }; 4866} 4867 4868/// \brief Member lookup function that determines whether a given C++ 4869/// method overloads virtual methods in a base class without overriding any, 4870/// to be used with CXXRecordDecl::lookupInBases(). 4871static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4872 CXXBasePath &Path, 4873 void *UserData) { 4874 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4875 4876 FindHiddenVirtualMethodData &Data 4877 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4878 4879 DeclarationName Name = Data.Method->getDeclName(); 4880 assert(Name.getNameKind() == DeclarationName::Identifier); 4881 4882 bool foundSameNameMethod = false; 4883 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4884 for (Path.Decls = BaseRecord->lookup(Name); 4885 Path.Decls.first != Path.Decls.second; 4886 ++Path.Decls.first) { 4887 NamedDecl *D = *Path.Decls.first; 4888 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4889 MD = MD->getCanonicalDecl(); 4890 foundSameNameMethod = true; 4891 // Interested only in hidden virtual methods. 4892 if (!MD->isVirtual()) 4893 continue; 4894 // If the method we are checking overrides a method from its base 4895 // don't warn about the other overloaded methods. 4896 if (!Data.S->IsOverload(Data.Method, MD, false)) 4897 return true; 4898 // Collect the overload only if its hidden. 4899 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4900 overloadedMethods.push_back(MD); 4901 } 4902 } 4903 4904 if (foundSameNameMethod) 4905 Data.OverloadedMethods.append(overloadedMethods.begin(), 4906 overloadedMethods.end()); 4907 return foundSameNameMethod; 4908} 4909 4910/// \brief See if a method overloads virtual methods in a base class without 4911/// overriding any. 4912void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4913 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4914 MD->getLocation()) == DiagnosticsEngine::Ignored) 4915 return; 4916 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4917 return; 4918 4919 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4920 /*bool RecordPaths=*/false, 4921 /*bool DetectVirtual=*/false); 4922 FindHiddenVirtualMethodData Data; 4923 Data.Method = MD; 4924 Data.S = this; 4925 4926 // Keep the base methods that were overriden or introduced in the subclass 4927 // by 'using' in a set. A base method not in this set is hidden. 4928 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4929 res.first != res.second; ++res.first) { 4930 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4931 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4932 E = MD->end_overridden_methods(); 4933 I != E; ++I) 4934 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4935 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4936 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4937 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4938 } 4939 4940 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4941 !Data.OverloadedMethods.empty()) { 4942 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4943 << MD << (Data.OverloadedMethods.size() > 1); 4944 4945 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4946 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4947 Diag(overloadedMD->getLocation(), 4948 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4949 } 4950 } 4951} 4952 4953void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4954 Decl *TagDecl, 4955 SourceLocation LBrac, 4956 SourceLocation RBrac, 4957 AttributeList *AttrList) { 4958 if (!TagDecl) 4959 return; 4960 4961 AdjustDeclIfTemplate(TagDecl); 4962 4963 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4964 // strict aliasing violation! 4965 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4966 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4967 4968 CheckCompletedCXXClass( 4969 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4970} 4971 4972/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4973/// special functions, such as the default constructor, copy 4974/// constructor, or destructor, to the given C++ class (C++ 4975/// [special]p1). This routine can only be executed just before the 4976/// definition of the class is complete. 4977void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4978 if (!ClassDecl->hasUserDeclaredConstructor()) 4979 ++ASTContext::NumImplicitDefaultConstructors; 4980 4981 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4982 ++ASTContext::NumImplicitCopyConstructors; 4983 4984 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4985 ++ASTContext::NumImplicitMoveConstructors; 4986 4987 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4988 ++ASTContext::NumImplicitCopyAssignmentOperators; 4989 4990 // If we have a dynamic class, then the copy assignment operator may be 4991 // virtual, so we have to declare it immediately. This ensures that, e.g., 4992 // it shows up in the right place in the vtable and that we diagnose 4993 // problems with the implicit exception specification. 4994 if (ClassDecl->isDynamicClass()) 4995 DeclareImplicitCopyAssignment(ClassDecl); 4996 } 4997 4998 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4999 ++ASTContext::NumImplicitMoveAssignmentOperators; 5000 5001 // Likewise for the move assignment operator. 5002 if (ClassDecl->isDynamicClass()) 5003 DeclareImplicitMoveAssignment(ClassDecl); 5004 } 5005 5006 if (!ClassDecl->hasUserDeclaredDestructor()) { 5007 ++ASTContext::NumImplicitDestructors; 5008 5009 // If we have a dynamic class, then the destructor may be virtual, so we 5010 // have to declare the destructor immediately. This ensures that, e.g., it 5011 // shows up in the right place in the vtable and that we diagnose problems 5012 // with the implicit exception specification. 5013 if (ClassDecl->isDynamicClass()) 5014 DeclareImplicitDestructor(ClassDecl); 5015 } 5016} 5017 5018void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5019 if (!D) 5020 return; 5021 5022 int NumParamList = D->getNumTemplateParameterLists(); 5023 for (int i = 0; i < NumParamList; i++) { 5024 TemplateParameterList* Params = D->getTemplateParameterList(i); 5025 for (TemplateParameterList::iterator Param = Params->begin(), 5026 ParamEnd = Params->end(); 5027 Param != ParamEnd; ++Param) { 5028 NamedDecl *Named = cast<NamedDecl>(*Param); 5029 if (Named->getDeclName()) { 5030 S->AddDecl(Named); 5031 IdResolver.AddDecl(Named); 5032 } 5033 } 5034 } 5035} 5036 5037void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5038 if (!D) 5039 return; 5040 5041 TemplateParameterList *Params = 0; 5042 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5043 Params = Template->getTemplateParameters(); 5044 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5045 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5046 Params = PartialSpec->getTemplateParameters(); 5047 else 5048 return; 5049 5050 for (TemplateParameterList::iterator Param = Params->begin(), 5051 ParamEnd = Params->end(); 5052 Param != ParamEnd; ++Param) { 5053 NamedDecl *Named = cast<NamedDecl>(*Param); 5054 if (Named->getDeclName()) { 5055 S->AddDecl(Named); 5056 IdResolver.AddDecl(Named); 5057 } 5058 } 5059} 5060 5061void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5062 if (!RecordD) return; 5063 AdjustDeclIfTemplate(RecordD); 5064 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5065 PushDeclContext(S, Record); 5066} 5067 5068void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5069 if (!RecordD) return; 5070 PopDeclContext(); 5071} 5072 5073/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5074/// parsing a top-level (non-nested) C++ class, and we are now 5075/// parsing those parts of the given Method declaration that could 5076/// not be parsed earlier (C++ [class.mem]p2), such as default 5077/// arguments. This action should enter the scope of the given 5078/// Method declaration as if we had just parsed the qualified method 5079/// name. However, it should not bring the parameters into scope; 5080/// that will be performed by ActOnDelayedCXXMethodParameter. 5081void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5082} 5083 5084/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5085/// C++ method declaration. We're (re-)introducing the given 5086/// function parameter into scope for use in parsing later parts of 5087/// the method declaration. For example, we could see an 5088/// ActOnParamDefaultArgument event for this parameter. 5089void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5090 if (!ParamD) 5091 return; 5092 5093 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5094 5095 // If this parameter has an unparsed default argument, clear it out 5096 // to make way for the parsed default argument. 5097 if (Param->hasUnparsedDefaultArg()) 5098 Param->setDefaultArg(0); 5099 5100 S->AddDecl(Param); 5101 if (Param->getDeclName()) 5102 IdResolver.AddDecl(Param); 5103} 5104 5105/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5106/// processing the delayed method declaration for Method. The method 5107/// declaration is now considered finished. There may be a separate 5108/// ActOnStartOfFunctionDef action later (not necessarily 5109/// immediately!) for this method, if it was also defined inside the 5110/// class body. 5111void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5112 if (!MethodD) 5113 return; 5114 5115 AdjustDeclIfTemplate(MethodD); 5116 5117 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5118 5119 // Now that we have our default arguments, check the constructor 5120 // again. It could produce additional diagnostics or affect whether 5121 // the class has implicitly-declared destructors, among other 5122 // things. 5123 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5124 CheckConstructor(Constructor); 5125 5126 // Check the default arguments, which we may have added. 5127 if (!Method->isInvalidDecl()) 5128 CheckCXXDefaultArguments(Method); 5129} 5130 5131/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5132/// the well-formedness of the constructor declarator @p D with type @p 5133/// R. If there are any errors in the declarator, this routine will 5134/// emit diagnostics and set the invalid bit to true. In any case, the type 5135/// will be updated to reflect a well-formed type for the constructor and 5136/// returned. 5137QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5138 StorageClass &SC) { 5139 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5140 5141 // C++ [class.ctor]p3: 5142 // A constructor shall not be virtual (10.3) or static (9.4). A 5143 // constructor can be invoked for a const, volatile or const 5144 // volatile object. A constructor shall not be declared const, 5145 // volatile, or const volatile (9.3.2). 5146 if (isVirtual) { 5147 if (!D.isInvalidType()) 5148 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5149 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5150 << SourceRange(D.getIdentifierLoc()); 5151 D.setInvalidType(); 5152 } 5153 if (SC == SC_Static) { 5154 if (!D.isInvalidType()) 5155 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5156 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5157 << SourceRange(D.getIdentifierLoc()); 5158 D.setInvalidType(); 5159 SC = SC_None; 5160 } 5161 5162 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5163 if (FTI.TypeQuals != 0) { 5164 if (FTI.TypeQuals & Qualifiers::Const) 5165 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5166 << "const" << SourceRange(D.getIdentifierLoc()); 5167 if (FTI.TypeQuals & Qualifiers::Volatile) 5168 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5169 << "volatile" << SourceRange(D.getIdentifierLoc()); 5170 if (FTI.TypeQuals & Qualifiers::Restrict) 5171 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5172 << "restrict" << SourceRange(D.getIdentifierLoc()); 5173 D.setInvalidType(); 5174 } 5175 5176 // C++0x [class.ctor]p4: 5177 // A constructor shall not be declared with a ref-qualifier. 5178 if (FTI.hasRefQualifier()) { 5179 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5180 << FTI.RefQualifierIsLValueRef 5181 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5182 D.setInvalidType(); 5183 } 5184 5185 // Rebuild the function type "R" without any type qualifiers (in 5186 // case any of the errors above fired) and with "void" as the 5187 // return type, since constructors don't have return types. 5188 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5189 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5190 return R; 5191 5192 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5193 EPI.TypeQuals = 0; 5194 EPI.RefQualifier = RQ_None; 5195 5196 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5197 Proto->getNumArgs(), EPI); 5198} 5199 5200/// CheckConstructor - Checks a fully-formed constructor for 5201/// well-formedness, issuing any diagnostics required. Returns true if 5202/// the constructor declarator is invalid. 5203void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5204 CXXRecordDecl *ClassDecl 5205 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5206 if (!ClassDecl) 5207 return Constructor->setInvalidDecl(); 5208 5209 // C++ [class.copy]p3: 5210 // A declaration of a constructor for a class X is ill-formed if 5211 // its first parameter is of type (optionally cv-qualified) X and 5212 // either there are no other parameters or else all other 5213 // parameters have default arguments. 5214 if (!Constructor->isInvalidDecl() && 5215 ((Constructor->getNumParams() == 1) || 5216 (Constructor->getNumParams() > 1 && 5217 Constructor->getParamDecl(1)->hasDefaultArg())) && 5218 Constructor->getTemplateSpecializationKind() 5219 != TSK_ImplicitInstantiation) { 5220 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5221 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5222 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5223 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5224 const char *ConstRef 5225 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5226 : " const &"; 5227 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5228 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5229 5230 // FIXME: Rather that making the constructor invalid, we should endeavor 5231 // to fix the type. 5232 Constructor->setInvalidDecl(); 5233 } 5234 } 5235} 5236 5237/// CheckDestructor - Checks a fully-formed destructor definition for 5238/// well-formedness, issuing any diagnostics required. Returns true 5239/// on error. 5240bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5241 CXXRecordDecl *RD = Destructor->getParent(); 5242 5243 if (Destructor->isVirtual()) { 5244 SourceLocation Loc; 5245 5246 if (!Destructor->isImplicit()) 5247 Loc = Destructor->getLocation(); 5248 else 5249 Loc = RD->getLocation(); 5250 5251 // If we have a virtual destructor, look up the deallocation function 5252 FunctionDecl *OperatorDelete = 0; 5253 DeclarationName Name = 5254 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5255 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5256 return true; 5257 5258 MarkDeclarationReferenced(Loc, OperatorDelete); 5259 5260 Destructor->setOperatorDelete(OperatorDelete); 5261 } 5262 5263 return false; 5264} 5265 5266static inline bool 5267FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5268 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5269 FTI.ArgInfo[0].Param && 5270 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5271} 5272 5273/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5274/// the well-formednes of the destructor declarator @p D with type @p 5275/// R. If there are any errors in the declarator, this routine will 5276/// emit diagnostics and set the declarator to invalid. Even if this happens, 5277/// will be updated to reflect a well-formed type for the destructor and 5278/// returned. 5279QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5280 StorageClass& SC) { 5281 // C++ [class.dtor]p1: 5282 // [...] A typedef-name that names a class is a class-name 5283 // (7.1.3); however, a typedef-name that names a class shall not 5284 // be used as the identifier in the declarator for a destructor 5285 // declaration. 5286 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5287 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5288 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5289 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5290 else if (const TemplateSpecializationType *TST = 5291 DeclaratorType->getAs<TemplateSpecializationType>()) 5292 if (TST->isTypeAlias()) 5293 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5294 << DeclaratorType << 1; 5295 5296 // C++ [class.dtor]p2: 5297 // A destructor is used to destroy objects of its class type. A 5298 // destructor takes no parameters, and no return type can be 5299 // specified for it (not even void). The address of a destructor 5300 // shall not be taken. A destructor shall not be static. A 5301 // destructor can be invoked for a const, volatile or const 5302 // volatile object. A destructor shall not be declared const, 5303 // volatile or const volatile (9.3.2). 5304 if (SC == SC_Static) { 5305 if (!D.isInvalidType()) 5306 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5307 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5308 << SourceRange(D.getIdentifierLoc()) 5309 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5310 5311 SC = SC_None; 5312 } 5313 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5314 // Destructors don't have return types, but the parser will 5315 // happily parse something like: 5316 // 5317 // class X { 5318 // float ~X(); 5319 // }; 5320 // 5321 // The return type will be eliminated later. 5322 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5323 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5324 << SourceRange(D.getIdentifierLoc()); 5325 } 5326 5327 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5328 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5329 if (FTI.TypeQuals & Qualifiers::Const) 5330 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5331 << "const" << SourceRange(D.getIdentifierLoc()); 5332 if (FTI.TypeQuals & Qualifiers::Volatile) 5333 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5334 << "volatile" << SourceRange(D.getIdentifierLoc()); 5335 if (FTI.TypeQuals & Qualifiers::Restrict) 5336 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5337 << "restrict" << SourceRange(D.getIdentifierLoc()); 5338 D.setInvalidType(); 5339 } 5340 5341 // C++0x [class.dtor]p2: 5342 // A destructor shall not be declared with a ref-qualifier. 5343 if (FTI.hasRefQualifier()) { 5344 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5345 << FTI.RefQualifierIsLValueRef 5346 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5347 D.setInvalidType(); 5348 } 5349 5350 // Make sure we don't have any parameters. 5351 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5352 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5353 5354 // Delete the parameters. 5355 FTI.freeArgs(); 5356 D.setInvalidType(); 5357 } 5358 5359 // Make sure the destructor isn't variadic. 5360 if (FTI.isVariadic) { 5361 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5362 D.setInvalidType(); 5363 } 5364 5365 // Rebuild the function type "R" without any type qualifiers or 5366 // parameters (in case any of the errors above fired) and with 5367 // "void" as the return type, since destructors don't have return 5368 // types. 5369 if (!D.isInvalidType()) 5370 return R; 5371 5372 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5373 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5374 EPI.Variadic = false; 5375 EPI.TypeQuals = 0; 5376 EPI.RefQualifier = RQ_None; 5377 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5378} 5379 5380/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5381/// well-formednes of the conversion function declarator @p D with 5382/// type @p R. If there are any errors in the declarator, this routine 5383/// will emit diagnostics and return true. Otherwise, it will return 5384/// false. Either way, the type @p R will be updated to reflect a 5385/// well-formed type for the conversion operator. 5386void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5387 StorageClass& SC) { 5388 // C++ [class.conv.fct]p1: 5389 // Neither parameter types nor return type can be specified. The 5390 // type of a conversion function (8.3.5) is "function taking no 5391 // parameter returning conversion-type-id." 5392 if (SC == SC_Static) { 5393 if (!D.isInvalidType()) 5394 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5395 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5396 << SourceRange(D.getIdentifierLoc()); 5397 D.setInvalidType(); 5398 SC = SC_None; 5399 } 5400 5401 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5402 5403 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5404 // Conversion functions don't have return types, but the parser will 5405 // happily parse something like: 5406 // 5407 // class X { 5408 // float operator bool(); 5409 // }; 5410 // 5411 // The return type will be changed later anyway. 5412 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5413 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5414 << SourceRange(D.getIdentifierLoc()); 5415 D.setInvalidType(); 5416 } 5417 5418 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5419 5420 // Make sure we don't have any parameters. 5421 if (Proto->getNumArgs() > 0) { 5422 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5423 5424 // Delete the parameters. 5425 D.getFunctionTypeInfo().freeArgs(); 5426 D.setInvalidType(); 5427 } else if (Proto->isVariadic()) { 5428 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5429 D.setInvalidType(); 5430 } 5431 5432 // Diagnose "&operator bool()" and other such nonsense. This 5433 // is actually a gcc extension which we don't support. 5434 if (Proto->getResultType() != ConvType) { 5435 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5436 << Proto->getResultType(); 5437 D.setInvalidType(); 5438 ConvType = Proto->getResultType(); 5439 } 5440 5441 // C++ [class.conv.fct]p4: 5442 // The conversion-type-id shall not represent a function type nor 5443 // an array type. 5444 if (ConvType->isArrayType()) { 5445 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5446 ConvType = Context.getPointerType(ConvType); 5447 D.setInvalidType(); 5448 } else if (ConvType->isFunctionType()) { 5449 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5450 ConvType = Context.getPointerType(ConvType); 5451 D.setInvalidType(); 5452 } 5453 5454 // Rebuild the function type "R" without any parameters (in case any 5455 // of the errors above fired) and with the conversion type as the 5456 // return type. 5457 if (D.isInvalidType()) 5458 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5459 5460 // C++0x explicit conversion operators. 5461 if (D.getDeclSpec().isExplicitSpecified()) 5462 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5463 getLangOptions().CPlusPlus0x ? 5464 diag::warn_cxx98_compat_explicit_conversion_functions : 5465 diag::ext_explicit_conversion_functions) 5466 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5467} 5468 5469/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5470/// the declaration of the given C++ conversion function. This routine 5471/// is responsible for recording the conversion function in the C++ 5472/// class, if possible. 5473Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5474 assert(Conversion && "Expected to receive a conversion function declaration"); 5475 5476 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5477 5478 // Make sure we aren't redeclaring the conversion function. 5479 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5480 5481 // C++ [class.conv.fct]p1: 5482 // [...] A conversion function is never used to convert a 5483 // (possibly cv-qualified) object to the (possibly cv-qualified) 5484 // same object type (or a reference to it), to a (possibly 5485 // cv-qualified) base class of that type (or a reference to it), 5486 // or to (possibly cv-qualified) void. 5487 // FIXME: Suppress this warning if the conversion function ends up being a 5488 // virtual function that overrides a virtual function in a base class. 5489 QualType ClassType 5490 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5491 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5492 ConvType = ConvTypeRef->getPointeeType(); 5493 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5494 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5495 /* Suppress diagnostics for instantiations. */; 5496 else if (ConvType->isRecordType()) { 5497 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5498 if (ConvType == ClassType) 5499 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5500 << ClassType; 5501 else if (IsDerivedFrom(ClassType, ConvType)) 5502 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5503 << ClassType << ConvType; 5504 } else if (ConvType->isVoidType()) { 5505 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5506 << ClassType << ConvType; 5507 } 5508 5509 if (FunctionTemplateDecl *ConversionTemplate 5510 = Conversion->getDescribedFunctionTemplate()) 5511 return ConversionTemplate; 5512 5513 return Conversion; 5514} 5515 5516//===----------------------------------------------------------------------===// 5517// Namespace Handling 5518//===----------------------------------------------------------------------===// 5519 5520 5521 5522/// ActOnStartNamespaceDef - This is called at the start of a namespace 5523/// definition. 5524Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5525 SourceLocation InlineLoc, 5526 SourceLocation NamespaceLoc, 5527 SourceLocation IdentLoc, 5528 IdentifierInfo *II, 5529 SourceLocation LBrace, 5530 AttributeList *AttrList) { 5531 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5532 // For anonymous namespace, take the location of the left brace. 5533 SourceLocation Loc = II ? IdentLoc : LBrace; 5534 bool IsInline = InlineLoc.isValid(); 5535 bool IsInvalid = false; 5536 bool IsStd = false; 5537 bool AddToKnown = false; 5538 Scope *DeclRegionScope = NamespcScope->getParent(); 5539 5540 NamespaceDecl *PrevNS = 0; 5541 if (II) { 5542 // C++ [namespace.def]p2: 5543 // The identifier in an original-namespace-definition shall not 5544 // have been previously defined in the declarative region in 5545 // which the original-namespace-definition appears. The 5546 // identifier in an original-namespace-definition is the name of 5547 // the namespace. Subsequently in that declarative region, it is 5548 // treated as an original-namespace-name. 5549 // 5550 // Since namespace names are unique in their scope, and we don't 5551 // look through using directives, just look for any ordinary names. 5552 5553 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5554 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5555 Decl::IDNS_Namespace; 5556 NamedDecl *PrevDecl = 0; 5557 for (DeclContext::lookup_result R 5558 = CurContext->getRedeclContext()->lookup(II); 5559 R.first != R.second; ++R.first) { 5560 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5561 PrevDecl = *R.first; 5562 break; 5563 } 5564 } 5565 5566 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5567 5568 if (PrevNS) { 5569 // This is an extended namespace definition. 5570 if (IsInline != PrevNS->isInline()) { 5571 // inline-ness must match 5572 if (PrevNS->isInline()) { 5573 // The user probably just forgot the 'inline', so suggest that it 5574 // be added back. 5575 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5576 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5577 } else { 5578 Diag(Loc, diag::err_inline_namespace_mismatch) 5579 << IsInline; 5580 } 5581 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5582 5583 IsInline = PrevNS->isInline(); 5584 } 5585 } else if (PrevDecl) { 5586 // This is an invalid name redefinition. 5587 Diag(Loc, diag::err_redefinition_different_kind) 5588 << II; 5589 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5590 IsInvalid = true; 5591 // Continue on to push Namespc as current DeclContext and return it. 5592 } else if (II->isStr("std") && 5593 CurContext->getRedeclContext()->isTranslationUnit()) { 5594 // This is the first "real" definition of the namespace "std", so update 5595 // our cache of the "std" namespace to point at this definition. 5596 PrevNS = getStdNamespace(); 5597 IsStd = true; 5598 AddToKnown = !IsInline; 5599 } else { 5600 // We've seen this namespace for the first time. 5601 AddToKnown = !IsInline; 5602 } 5603 } else { 5604 // Anonymous namespaces. 5605 5606 // Determine whether the parent already has an anonymous namespace. 5607 DeclContext *Parent = CurContext->getRedeclContext(); 5608 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5609 PrevNS = TU->getAnonymousNamespace(); 5610 } else { 5611 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5612 PrevNS = ND->getAnonymousNamespace(); 5613 } 5614 5615 if (PrevNS && IsInline != PrevNS->isInline()) { 5616 // inline-ness must match 5617 Diag(Loc, diag::err_inline_namespace_mismatch) 5618 << IsInline; 5619 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5620 5621 // Recover by ignoring the new namespace's inline status. 5622 IsInline = PrevNS->isInline(); 5623 } 5624 } 5625 5626 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5627 StartLoc, Loc, II, PrevNS); 5628 if (IsInvalid) 5629 Namespc->setInvalidDecl(); 5630 5631 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5632 5633 // FIXME: Should we be merging attributes? 5634 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5635 PushNamespaceVisibilityAttr(Attr); 5636 5637 if (IsStd) 5638 StdNamespace = Namespc; 5639 if (AddToKnown) 5640 KnownNamespaces[Namespc] = false; 5641 5642 if (II) { 5643 PushOnScopeChains(Namespc, DeclRegionScope); 5644 } else { 5645 // Link the anonymous namespace into its parent. 5646 DeclContext *Parent = CurContext->getRedeclContext(); 5647 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5648 TU->setAnonymousNamespace(Namespc); 5649 } else { 5650 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5651 } 5652 5653 CurContext->addDecl(Namespc); 5654 5655 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5656 // behaves as if it were replaced by 5657 // namespace unique { /* empty body */ } 5658 // using namespace unique; 5659 // namespace unique { namespace-body } 5660 // where all occurrences of 'unique' in a translation unit are 5661 // replaced by the same identifier and this identifier differs 5662 // from all other identifiers in the entire program. 5663 5664 // We just create the namespace with an empty name and then add an 5665 // implicit using declaration, just like the standard suggests. 5666 // 5667 // CodeGen enforces the "universally unique" aspect by giving all 5668 // declarations semantically contained within an anonymous 5669 // namespace internal linkage. 5670 5671 if (!PrevNS) { 5672 UsingDirectiveDecl* UD 5673 = UsingDirectiveDecl::Create(Context, CurContext, 5674 /* 'using' */ LBrace, 5675 /* 'namespace' */ SourceLocation(), 5676 /* qualifier */ NestedNameSpecifierLoc(), 5677 /* identifier */ SourceLocation(), 5678 Namespc, 5679 /* Ancestor */ CurContext); 5680 UD->setImplicit(); 5681 CurContext->addDecl(UD); 5682 } 5683 } 5684 5685 // Although we could have an invalid decl (i.e. the namespace name is a 5686 // redefinition), push it as current DeclContext and try to continue parsing. 5687 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5688 // for the namespace has the declarations that showed up in that particular 5689 // namespace definition. 5690 PushDeclContext(NamespcScope, Namespc); 5691 return Namespc; 5692} 5693 5694/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5695/// is a namespace alias, returns the namespace it points to. 5696static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5697 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5698 return AD->getNamespace(); 5699 return dyn_cast_or_null<NamespaceDecl>(D); 5700} 5701 5702/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5703/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5704void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5705 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5706 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5707 Namespc->setRBraceLoc(RBrace); 5708 PopDeclContext(); 5709 if (Namespc->hasAttr<VisibilityAttr>()) 5710 PopPragmaVisibility(); 5711} 5712 5713CXXRecordDecl *Sema::getStdBadAlloc() const { 5714 return cast_or_null<CXXRecordDecl>( 5715 StdBadAlloc.get(Context.getExternalSource())); 5716} 5717 5718NamespaceDecl *Sema::getStdNamespace() const { 5719 return cast_or_null<NamespaceDecl>( 5720 StdNamespace.get(Context.getExternalSource())); 5721} 5722 5723/// \brief Retrieve the special "std" namespace, which may require us to 5724/// implicitly define the namespace. 5725NamespaceDecl *Sema::getOrCreateStdNamespace() { 5726 if (!StdNamespace) { 5727 // The "std" namespace has not yet been defined, so build one implicitly. 5728 StdNamespace = NamespaceDecl::Create(Context, 5729 Context.getTranslationUnitDecl(), 5730 /*Inline=*/false, 5731 SourceLocation(), SourceLocation(), 5732 &PP.getIdentifierTable().get("std"), 5733 /*PrevDecl=*/0); 5734 getStdNamespace()->setImplicit(true); 5735 } 5736 5737 return getStdNamespace(); 5738} 5739 5740/// \brief Determine whether a using statement is in a context where it will be 5741/// apply in all contexts. 5742static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5743 switch (CurContext->getDeclKind()) { 5744 case Decl::TranslationUnit: 5745 return true; 5746 case Decl::LinkageSpec: 5747 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5748 default: 5749 return false; 5750 } 5751} 5752 5753static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5754 CXXScopeSpec &SS, 5755 SourceLocation IdentLoc, 5756 IdentifierInfo *Ident) { 5757 R.clear(); 5758 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5759 R.getLookupKind(), Sc, &SS, NULL, 5760 false, S.CTC_NoKeywords, NULL)) { 5761 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5762 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5763 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5764 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5765 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5766 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5767 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5768 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5769 else 5770 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5771 << Ident << CorrectedQuotedStr 5772 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5773 5774 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5775 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5776 5777 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5778 R.addDecl(Corrected.getCorrectionDecl()); 5779 return true; 5780 } 5781 R.setLookupName(Ident); 5782 } 5783 return false; 5784} 5785 5786Decl *Sema::ActOnUsingDirective(Scope *S, 5787 SourceLocation UsingLoc, 5788 SourceLocation NamespcLoc, 5789 CXXScopeSpec &SS, 5790 SourceLocation IdentLoc, 5791 IdentifierInfo *NamespcName, 5792 AttributeList *AttrList) { 5793 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5794 assert(NamespcName && "Invalid NamespcName."); 5795 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5796 5797 // This can only happen along a recovery path. 5798 while (S->getFlags() & Scope::TemplateParamScope) 5799 S = S->getParent(); 5800 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5801 5802 UsingDirectiveDecl *UDir = 0; 5803 NestedNameSpecifier *Qualifier = 0; 5804 if (SS.isSet()) 5805 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5806 5807 // Lookup namespace name. 5808 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5809 LookupParsedName(R, S, &SS); 5810 if (R.isAmbiguous()) 5811 return 0; 5812 5813 if (R.empty()) { 5814 R.clear(); 5815 // Allow "using namespace std;" or "using namespace ::std;" even if 5816 // "std" hasn't been defined yet, for GCC compatibility. 5817 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5818 NamespcName->isStr("std")) { 5819 Diag(IdentLoc, diag::ext_using_undefined_std); 5820 R.addDecl(getOrCreateStdNamespace()); 5821 R.resolveKind(); 5822 } 5823 // Otherwise, attempt typo correction. 5824 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5825 } 5826 5827 if (!R.empty()) { 5828 NamedDecl *Named = R.getFoundDecl(); 5829 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5830 && "expected namespace decl"); 5831 // C++ [namespace.udir]p1: 5832 // A using-directive specifies that the names in the nominated 5833 // namespace can be used in the scope in which the 5834 // using-directive appears after the using-directive. During 5835 // unqualified name lookup (3.4.1), the names appear as if they 5836 // were declared in the nearest enclosing namespace which 5837 // contains both the using-directive and the nominated 5838 // namespace. [Note: in this context, "contains" means "contains 5839 // directly or indirectly". ] 5840 5841 // Find enclosing context containing both using-directive and 5842 // nominated namespace. 5843 NamespaceDecl *NS = getNamespaceDecl(Named); 5844 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5845 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5846 CommonAncestor = CommonAncestor->getParent(); 5847 5848 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5849 SS.getWithLocInContext(Context), 5850 IdentLoc, Named, CommonAncestor); 5851 5852 if (IsUsingDirectiveInToplevelContext(CurContext) && 5853 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5854 Diag(IdentLoc, diag::warn_using_directive_in_header); 5855 } 5856 5857 PushUsingDirective(S, UDir); 5858 } else { 5859 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5860 } 5861 5862 // FIXME: We ignore attributes for now. 5863 return UDir; 5864} 5865 5866void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5867 // If scope has associated entity, then using directive is at namespace 5868 // or translation unit scope. We add UsingDirectiveDecls, into 5869 // it's lookup structure. 5870 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5871 Ctx->addDecl(UDir); 5872 else 5873 // Otherwise it is block-sope. using-directives will affect lookup 5874 // only to the end of scope. 5875 S->PushUsingDirective(UDir); 5876} 5877 5878 5879Decl *Sema::ActOnUsingDeclaration(Scope *S, 5880 AccessSpecifier AS, 5881 bool HasUsingKeyword, 5882 SourceLocation UsingLoc, 5883 CXXScopeSpec &SS, 5884 UnqualifiedId &Name, 5885 AttributeList *AttrList, 5886 bool IsTypeName, 5887 SourceLocation TypenameLoc) { 5888 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5889 5890 switch (Name.getKind()) { 5891 case UnqualifiedId::IK_ImplicitSelfParam: 5892 case UnqualifiedId::IK_Identifier: 5893 case UnqualifiedId::IK_OperatorFunctionId: 5894 case UnqualifiedId::IK_LiteralOperatorId: 5895 case UnqualifiedId::IK_ConversionFunctionId: 5896 break; 5897 5898 case UnqualifiedId::IK_ConstructorName: 5899 case UnqualifiedId::IK_ConstructorTemplateId: 5900 // C++0x inherited constructors. 5901 Diag(Name.getSourceRange().getBegin(), 5902 getLangOptions().CPlusPlus0x ? 5903 diag::warn_cxx98_compat_using_decl_constructor : 5904 diag::err_using_decl_constructor) 5905 << SS.getRange(); 5906 5907 if (getLangOptions().CPlusPlus0x) break; 5908 5909 return 0; 5910 5911 case UnqualifiedId::IK_DestructorName: 5912 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5913 << SS.getRange(); 5914 return 0; 5915 5916 case UnqualifiedId::IK_TemplateId: 5917 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5918 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5919 return 0; 5920 } 5921 5922 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5923 DeclarationName TargetName = TargetNameInfo.getName(); 5924 if (!TargetName) 5925 return 0; 5926 5927 // Warn about using declarations. 5928 // TODO: store that the declaration was written without 'using' and 5929 // talk about access decls instead of using decls in the 5930 // diagnostics. 5931 if (!HasUsingKeyword) { 5932 UsingLoc = Name.getSourceRange().getBegin(); 5933 5934 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5935 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5936 } 5937 5938 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5939 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5940 return 0; 5941 5942 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5943 TargetNameInfo, AttrList, 5944 /* IsInstantiation */ false, 5945 IsTypeName, TypenameLoc); 5946 if (UD) 5947 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5948 5949 return UD; 5950} 5951 5952/// \brief Determine whether a using declaration considers the given 5953/// declarations as "equivalent", e.g., if they are redeclarations of 5954/// the same entity or are both typedefs of the same type. 5955static bool 5956IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5957 bool &SuppressRedeclaration) { 5958 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5959 SuppressRedeclaration = false; 5960 return true; 5961 } 5962 5963 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5964 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5965 SuppressRedeclaration = true; 5966 return Context.hasSameType(TD1->getUnderlyingType(), 5967 TD2->getUnderlyingType()); 5968 } 5969 5970 return false; 5971} 5972 5973 5974/// Determines whether to create a using shadow decl for a particular 5975/// decl, given the set of decls existing prior to this using lookup. 5976bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5977 const LookupResult &Previous) { 5978 // Diagnose finding a decl which is not from a base class of the 5979 // current class. We do this now because there are cases where this 5980 // function will silently decide not to build a shadow decl, which 5981 // will pre-empt further diagnostics. 5982 // 5983 // We don't need to do this in C++0x because we do the check once on 5984 // the qualifier. 5985 // 5986 // FIXME: diagnose the following if we care enough: 5987 // struct A { int foo; }; 5988 // struct B : A { using A::foo; }; 5989 // template <class T> struct C : A {}; 5990 // template <class T> struct D : C<T> { using B::foo; } // <--- 5991 // This is invalid (during instantiation) in C++03 because B::foo 5992 // resolves to the using decl in B, which is not a base class of D<T>. 5993 // We can't diagnose it immediately because C<T> is an unknown 5994 // specialization. The UsingShadowDecl in D<T> then points directly 5995 // to A::foo, which will look well-formed when we instantiate. 5996 // The right solution is to not collapse the shadow-decl chain. 5997 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5998 DeclContext *OrigDC = Orig->getDeclContext(); 5999 6000 // Handle enums and anonymous structs. 6001 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6002 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6003 while (OrigRec->isAnonymousStructOrUnion()) 6004 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6005 6006 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6007 if (OrigDC == CurContext) { 6008 Diag(Using->getLocation(), 6009 diag::err_using_decl_nested_name_specifier_is_current_class) 6010 << Using->getQualifierLoc().getSourceRange(); 6011 Diag(Orig->getLocation(), diag::note_using_decl_target); 6012 return true; 6013 } 6014 6015 Diag(Using->getQualifierLoc().getBeginLoc(), 6016 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6017 << Using->getQualifier() 6018 << cast<CXXRecordDecl>(CurContext) 6019 << Using->getQualifierLoc().getSourceRange(); 6020 Diag(Orig->getLocation(), diag::note_using_decl_target); 6021 return true; 6022 } 6023 } 6024 6025 if (Previous.empty()) return false; 6026 6027 NamedDecl *Target = Orig; 6028 if (isa<UsingShadowDecl>(Target)) 6029 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6030 6031 // If the target happens to be one of the previous declarations, we 6032 // don't have a conflict. 6033 // 6034 // FIXME: but we might be increasing its access, in which case we 6035 // should redeclare it. 6036 NamedDecl *NonTag = 0, *Tag = 0; 6037 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6038 I != E; ++I) { 6039 NamedDecl *D = (*I)->getUnderlyingDecl(); 6040 bool Result; 6041 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6042 return Result; 6043 6044 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6045 } 6046 6047 if (Target->isFunctionOrFunctionTemplate()) { 6048 FunctionDecl *FD; 6049 if (isa<FunctionTemplateDecl>(Target)) 6050 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6051 else 6052 FD = cast<FunctionDecl>(Target); 6053 6054 NamedDecl *OldDecl = 0; 6055 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6056 case Ovl_Overload: 6057 return false; 6058 6059 case Ovl_NonFunction: 6060 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6061 break; 6062 6063 // We found a decl with the exact signature. 6064 case Ovl_Match: 6065 // If we're in a record, we want to hide the target, so we 6066 // return true (without a diagnostic) to tell the caller not to 6067 // build a shadow decl. 6068 if (CurContext->isRecord()) 6069 return true; 6070 6071 // If we're not in a record, this is an error. 6072 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6073 break; 6074 } 6075 6076 Diag(Target->getLocation(), diag::note_using_decl_target); 6077 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6078 return true; 6079 } 6080 6081 // Target is not a function. 6082 6083 if (isa<TagDecl>(Target)) { 6084 // No conflict between a tag and a non-tag. 6085 if (!Tag) return false; 6086 6087 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6088 Diag(Target->getLocation(), diag::note_using_decl_target); 6089 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6090 return true; 6091 } 6092 6093 // No conflict between a tag and a non-tag. 6094 if (!NonTag) return false; 6095 6096 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6097 Diag(Target->getLocation(), diag::note_using_decl_target); 6098 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6099 return true; 6100} 6101 6102/// Builds a shadow declaration corresponding to a 'using' declaration. 6103UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6104 UsingDecl *UD, 6105 NamedDecl *Orig) { 6106 6107 // If we resolved to another shadow declaration, just coalesce them. 6108 NamedDecl *Target = Orig; 6109 if (isa<UsingShadowDecl>(Target)) { 6110 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6111 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6112 } 6113 6114 UsingShadowDecl *Shadow 6115 = UsingShadowDecl::Create(Context, CurContext, 6116 UD->getLocation(), UD, Target); 6117 UD->addShadowDecl(Shadow); 6118 6119 Shadow->setAccess(UD->getAccess()); 6120 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6121 Shadow->setInvalidDecl(); 6122 6123 if (S) 6124 PushOnScopeChains(Shadow, S); 6125 else 6126 CurContext->addDecl(Shadow); 6127 6128 6129 return Shadow; 6130} 6131 6132/// Hides a using shadow declaration. This is required by the current 6133/// using-decl implementation when a resolvable using declaration in a 6134/// class is followed by a declaration which would hide or override 6135/// one or more of the using decl's targets; for example: 6136/// 6137/// struct Base { void foo(int); }; 6138/// struct Derived : Base { 6139/// using Base::foo; 6140/// void foo(int); 6141/// }; 6142/// 6143/// The governing language is C++03 [namespace.udecl]p12: 6144/// 6145/// When a using-declaration brings names from a base class into a 6146/// derived class scope, member functions in the derived class 6147/// override and/or hide member functions with the same name and 6148/// parameter types in a base class (rather than conflicting). 6149/// 6150/// There are two ways to implement this: 6151/// (1) optimistically create shadow decls when they're not hidden 6152/// by existing declarations, or 6153/// (2) don't create any shadow decls (or at least don't make them 6154/// visible) until we've fully parsed/instantiated the class. 6155/// The problem with (1) is that we might have to retroactively remove 6156/// a shadow decl, which requires several O(n) operations because the 6157/// decl structures are (very reasonably) not designed for removal. 6158/// (2) avoids this but is very fiddly and phase-dependent. 6159void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6160 if (Shadow->getDeclName().getNameKind() == 6161 DeclarationName::CXXConversionFunctionName) 6162 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6163 6164 // Remove it from the DeclContext... 6165 Shadow->getDeclContext()->removeDecl(Shadow); 6166 6167 // ...and the scope, if applicable... 6168 if (S) { 6169 S->RemoveDecl(Shadow); 6170 IdResolver.RemoveDecl(Shadow); 6171 } 6172 6173 // ...and the using decl. 6174 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6175 6176 // TODO: complain somehow if Shadow was used. It shouldn't 6177 // be possible for this to happen, because...? 6178} 6179 6180/// Builds a using declaration. 6181/// 6182/// \param IsInstantiation - Whether this call arises from an 6183/// instantiation of an unresolved using declaration. We treat 6184/// the lookup differently for these declarations. 6185NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6186 SourceLocation UsingLoc, 6187 CXXScopeSpec &SS, 6188 const DeclarationNameInfo &NameInfo, 6189 AttributeList *AttrList, 6190 bool IsInstantiation, 6191 bool IsTypeName, 6192 SourceLocation TypenameLoc) { 6193 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6194 SourceLocation IdentLoc = NameInfo.getLoc(); 6195 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6196 6197 // FIXME: We ignore attributes for now. 6198 6199 if (SS.isEmpty()) { 6200 Diag(IdentLoc, diag::err_using_requires_qualname); 6201 return 0; 6202 } 6203 6204 // Do the redeclaration lookup in the current scope. 6205 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6206 ForRedeclaration); 6207 Previous.setHideTags(false); 6208 if (S) { 6209 LookupName(Previous, S); 6210 6211 // It is really dumb that we have to do this. 6212 LookupResult::Filter F = Previous.makeFilter(); 6213 while (F.hasNext()) { 6214 NamedDecl *D = F.next(); 6215 if (!isDeclInScope(D, CurContext, S)) 6216 F.erase(); 6217 } 6218 F.done(); 6219 } else { 6220 assert(IsInstantiation && "no scope in non-instantiation"); 6221 assert(CurContext->isRecord() && "scope not record in instantiation"); 6222 LookupQualifiedName(Previous, CurContext); 6223 } 6224 6225 // Check for invalid redeclarations. 6226 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6227 return 0; 6228 6229 // Check for bad qualifiers. 6230 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6231 return 0; 6232 6233 DeclContext *LookupContext = computeDeclContext(SS); 6234 NamedDecl *D; 6235 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6236 if (!LookupContext) { 6237 if (IsTypeName) { 6238 // FIXME: not all declaration name kinds are legal here 6239 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6240 UsingLoc, TypenameLoc, 6241 QualifierLoc, 6242 IdentLoc, NameInfo.getName()); 6243 } else { 6244 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6245 QualifierLoc, NameInfo); 6246 } 6247 } else { 6248 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6249 NameInfo, IsTypeName); 6250 } 6251 D->setAccess(AS); 6252 CurContext->addDecl(D); 6253 6254 if (!LookupContext) return D; 6255 UsingDecl *UD = cast<UsingDecl>(D); 6256 6257 if (RequireCompleteDeclContext(SS, LookupContext)) { 6258 UD->setInvalidDecl(); 6259 return UD; 6260 } 6261 6262 // Constructor inheriting using decls get special treatment. 6263 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6264 if (CheckInheritedConstructorUsingDecl(UD)) 6265 UD->setInvalidDecl(); 6266 return UD; 6267 } 6268 6269 // Otherwise, look up the target name. 6270 6271 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6272 6273 // Unlike most lookups, we don't always want to hide tag 6274 // declarations: tag names are visible through the using declaration 6275 // even if hidden by ordinary names, *except* in a dependent context 6276 // where it's important for the sanity of two-phase lookup. 6277 if (!IsInstantiation) 6278 R.setHideTags(false); 6279 6280 LookupQualifiedName(R, LookupContext); 6281 6282 if (R.empty()) { 6283 Diag(IdentLoc, diag::err_no_member) 6284 << NameInfo.getName() << LookupContext << SS.getRange(); 6285 UD->setInvalidDecl(); 6286 return UD; 6287 } 6288 6289 if (R.isAmbiguous()) { 6290 UD->setInvalidDecl(); 6291 return UD; 6292 } 6293 6294 if (IsTypeName) { 6295 // If we asked for a typename and got a non-type decl, error out. 6296 if (!R.getAsSingle<TypeDecl>()) { 6297 Diag(IdentLoc, diag::err_using_typename_non_type); 6298 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6299 Diag((*I)->getUnderlyingDecl()->getLocation(), 6300 diag::note_using_decl_target); 6301 UD->setInvalidDecl(); 6302 return UD; 6303 } 6304 } else { 6305 // If we asked for a non-typename and we got a type, error out, 6306 // but only if this is an instantiation of an unresolved using 6307 // decl. Otherwise just silently find the type name. 6308 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6309 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6310 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6311 UD->setInvalidDecl(); 6312 return UD; 6313 } 6314 } 6315 6316 // C++0x N2914 [namespace.udecl]p6: 6317 // A using-declaration shall not name a namespace. 6318 if (R.getAsSingle<NamespaceDecl>()) { 6319 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6320 << SS.getRange(); 6321 UD->setInvalidDecl(); 6322 return UD; 6323 } 6324 6325 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6326 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6327 BuildUsingShadowDecl(S, UD, *I); 6328 } 6329 6330 return UD; 6331} 6332 6333/// Additional checks for a using declaration referring to a constructor name. 6334bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6335 if (UD->isTypeName()) { 6336 // FIXME: Cannot specify typename when specifying constructor 6337 return true; 6338 } 6339 6340 const Type *SourceType = UD->getQualifier()->getAsType(); 6341 assert(SourceType && 6342 "Using decl naming constructor doesn't have type in scope spec."); 6343 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6344 6345 // Check whether the named type is a direct base class. 6346 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6347 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6348 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6349 BaseIt != BaseE; ++BaseIt) { 6350 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6351 if (CanonicalSourceType == BaseType) 6352 break; 6353 } 6354 6355 if (BaseIt == BaseE) { 6356 // Did not find SourceType in the bases. 6357 Diag(UD->getUsingLocation(), 6358 diag::err_using_decl_constructor_not_in_direct_base) 6359 << UD->getNameInfo().getSourceRange() 6360 << QualType(SourceType, 0) << TargetClass; 6361 return true; 6362 } 6363 6364 BaseIt->setInheritConstructors(); 6365 6366 return false; 6367} 6368 6369/// Checks that the given using declaration is not an invalid 6370/// redeclaration. Note that this is checking only for the using decl 6371/// itself, not for any ill-formedness among the UsingShadowDecls. 6372bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6373 bool isTypeName, 6374 const CXXScopeSpec &SS, 6375 SourceLocation NameLoc, 6376 const LookupResult &Prev) { 6377 // C++03 [namespace.udecl]p8: 6378 // C++0x [namespace.udecl]p10: 6379 // A using-declaration is a declaration and can therefore be used 6380 // repeatedly where (and only where) multiple declarations are 6381 // allowed. 6382 // 6383 // That's in non-member contexts. 6384 if (!CurContext->getRedeclContext()->isRecord()) 6385 return false; 6386 6387 NestedNameSpecifier *Qual 6388 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6389 6390 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6391 NamedDecl *D = *I; 6392 6393 bool DTypename; 6394 NestedNameSpecifier *DQual; 6395 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6396 DTypename = UD->isTypeName(); 6397 DQual = UD->getQualifier(); 6398 } else if (UnresolvedUsingValueDecl *UD 6399 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6400 DTypename = false; 6401 DQual = UD->getQualifier(); 6402 } else if (UnresolvedUsingTypenameDecl *UD 6403 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6404 DTypename = true; 6405 DQual = UD->getQualifier(); 6406 } else continue; 6407 6408 // using decls differ if one says 'typename' and the other doesn't. 6409 // FIXME: non-dependent using decls? 6410 if (isTypeName != DTypename) continue; 6411 6412 // using decls differ if they name different scopes (but note that 6413 // template instantiation can cause this check to trigger when it 6414 // didn't before instantiation). 6415 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6416 Context.getCanonicalNestedNameSpecifier(DQual)) 6417 continue; 6418 6419 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6420 Diag(D->getLocation(), diag::note_using_decl) << 1; 6421 return true; 6422 } 6423 6424 return false; 6425} 6426 6427 6428/// Checks that the given nested-name qualifier used in a using decl 6429/// in the current context is appropriately related to the current 6430/// scope. If an error is found, diagnoses it and returns true. 6431bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6432 const CXXScopeSpec &SS, 6433 SourceLocation NameLoc) { 6434 DeclContext *NamedContext = computeDeclContext(SS); 6435 6436 if (!CurContext->isRecord()) { 6437 // C++03 [namespace.udecl]p3: 6438 // C++0x [namespace.udecl]p8: 6439 // A using-declaration for a class member shall be a member-declaration. 6440 6441 // If we weren't able to compute a valid scope, it must be a 6442 // dependent class scope. 6443 if (!NamedContext || NamedContext->isRecord()) { 6444 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6445 << SS.getRange(); 6446 return true; 6447 } 6448 6449 // Otherwise, everything is known to be fine. 6450 return false; 6451 } 6452 6453 // The current scope is a record. 6454 6455 // If the named context is dependent, we can't decide much. 6456 if (!NamedContext) { 6457 // FIXME: in C++0x, we can diagnose if we can prove that the 6458 // nested-name-specifier does not refer to a base class, which is 6459 // still possible in some cases. 6460 6461 // Otherwise we have to conservatively report that things might be 6462 // okay. 6463 return false; 6464 } 6465 6466 if (!NamedContext->isRecord()) { 6467 // Ideally this would point at the last name in the specifier, 6468 // but we don't have that level of source info. 6469 Diag(SS.getRange().getBegin(), 6470 diag::err_using_decl_nested_name_specifier_is_not_class) 6471 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6472 return true; 6473 } 6474 6475 if (!NamedContext->isDependentContext() && 6476 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6477 return true; 6478 6479 if (getLangOptions().CPlusPlus0x) { 6480 // C++0x [namespace.udecl]p3: 6481 // In a using-declaration used as a member-declaration, the 6482 // nested-name-specifier shall name a base class of the class 6483 // being defined. 6484 6485 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6486 cast<CXXRecordDecl>(NamedContext))) { 6487 if (CurContext == NamedContext) { 6488 Diag(NameLoc, 6489 diag::err_using_decl_nested_name_specifier_is_current_class) 6490 << SS.getRange(); 6491 return true; 6492 } 6493 6494 Diag(SS.getRange().getBegin(), 6495 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6496 << (NestedNameSpecifier*) SS.getScopeRep() 6497 << cast<CXXRecordDecl>(CurContext) 6498 << SS.getRange(); 6499 return true; 6500 } 6501 6502 return false; 6503 } 6504 6505 // C++03 [namespace.udecl]p4: 6506 // A using-declaration used as a member-declaration shall refer 6507 // to a member of a base class of the class being defined [etc.]. 6508 6509 // Salient point: SS doesn't have to name a base class as long as 6510 // lookup only finds members from base classes. Therefore we can 6511 // diagnose here only if we can prove that that can't happen, 6512 // i.e. if the class hierarchies provably don't intersect. 6513 6514 // TODO: it would be nice if "definitely valid" results were cached 6515 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6516 // need to be repeated. 6517 6518 struct UserData { 6519 llvm::DenseSet<const CXXRecordDecl*> Bases; 6520 6521 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6522 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6523 Data->Bases.insert(Base); 6524 return true; 6525 } 6526 6527 bool hasDependentBases(const CXXRecordDecl *Class) { 6528 return !Class->forallBases(collect, this); 6529 } 6530 6531 /// Returns true if the base is dependent or is one of the 6532 /// accumulated base classes. 6533 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6534 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6535 return !Data->Bases.count(Base); 6536 } 6537 6538 bool mightShareBases(const CXXRecordDecl *Class) { 6539 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6540 } 6541 }; 6542 6543 UserData Data; 6544 6545 // Returns false if we find a dependent base. 6546 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6547 return false; 6548 6549 // Returns false if the class has a dependent base or if it or one 6550 // of its bases is present in the base set of the current context. 6551 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6552 return false; 6553 6554 Diag(SS.getRange().getBegin(), 6555 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6556 << (NestedNameSpecifier*) SS.getScopeRep() 6557 << cast<CXXRecordDecl>(CurContext) 6558 << SS.getRange(); 6559 6560 return true; 6561} 6562 6563Decl *Sema::ActOnAliasDeclaration(Scope *S, 6564 AccessSpecifier AS, 6565 MultiTemplateParamsArg TemplateParamLists, 6566 SourceLocation UsingLoc, 6567 UnqualifiedId &Name, 6568 TypeResult Type) { 6569 // Skip up to the relevant declaration scope. 6570 while (S->getFlags() & Scope::TemplateParamScope) 6571 S = S->getParent(); 6572 assert((S->getFlags() & Scope::DeclScope) && 6573 "got alias-declaration outside of declaration scope"); 6574 6575 if (Type.isInvalid()) 6576 return 0; 6577 6578 bool Invalid = false; 6579 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6580 TypeSourceInfo *TInfo = 0; 6581 GetTypeFromParser(Type.get(), &TInfo); 6582 6583 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6584 return 0; 6585 6586 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6587 UPPC_DeclarationType)) { 6588 Invalid = true; 6589 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6590 TInfo->getTypeLoc().getBeginLoc()); 6591 } 6592 6593 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6594 LookupName(Previous, S); 6595 6596 // Warn about shadowing the name of a template parameter. 6597 if (Previous.isSingleResult() && 6598 Previous.getFoundDecl()->isTemplateParameter()) { 6599 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6600 Previous.clear(); 6601 } 6602 6603 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6604 "name in alias declaration must be an identifier"); 6605 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6606 Name.StartLocation, 6607 Name.Identifier, TInfo); 6608 6609 NewTD->setAccess(AS); 6610 6611 if (Invalid) 6612 NewTD->setInvalidDecl(); 6613 6614 CheckTypedefForVariablyModifiedType(S, NewTD); 6615 Invalid |= NewTD->isInvalidDecl(); 6616 6617 bool Redeclaration = false; 6618 6619 NamedDecl *NewND; 6620 if (TemplateParamLists.size()) { 6621 TypeAliasTemplateDecl *OldDecl = 0; 6622 TemplateParameterList *OldTemplateParams = 0; 6623 6624 if (TemplateParamLists.size() != 1) { 6625 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6626 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6627 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6628 } 6629 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6630 6631 // Only consider previous declarations in the same scope. 6632 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6633 /*ExplicitInstantiationOrSpecialization*/false); 6634 if (!Previous.empty()) { 6635 Redeclaration = true; 6636 6637 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6638 if (!OldDecl && !Invalid) { 6639 Diag(UsingLoc, diag::err_redefinition_different_kind) 6640 << Name.Identifier; 6641 6642 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6643 if (OldD->getLocation().isValid()) 6644 Diag(OldD->getLocation(), diag::note_previous_definition); 6645 6646 Invalid = true; 6647 } 6648 6649 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6650 if (TemplateParameterListsAreEqual(TemplateParams, 6651 OldDecl->getTemplateParameters(), 6652 /*Complain=*/true, 6653 TPL_TemplateMatch)) 6654 OldTemplateParams = OldDecl->getTemplateParameters(); 6655 else 6656 Invalid = true; 6657 6658 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6659 if (!Invalid && 6660 !Context.hasSameType(OldTD->getUnderlyingType(), 6661 NewTD->getUnderlyingType())) { 6662 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6663 // but we can't reasonably accept it. 6664 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6665 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6666 if (OldTD->getLocation().isValid()) 6667 Diag(OldTD->getLocation(), diag::note_previous_definition); 6668 Invalid = true; 6669 } 6670 } 6671 } 6672 6673 // Merge any previous default template arguments into our parameters, 6674 // and check the parameter list. 6675 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6676 TPC_TypeAliasTemplate)) 6677 return 0; 6678 6679 TypeAliasTemplateDecl *NewDecl = 6680 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6681 Name.Identifier, TemplateParams, 6682 NewTD); 6683 6684 NewDecl->setAccess(AS); 6685 6686 if (Invalid) 6687 NewDecl->setInvalidDecl(); 6688 else if (OldDecl) 6689 NewDecl->setPreviousDeclaration(OldDecl); 6690 6691 NewND = NewDecl; 6692 } else { 6693 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6694 NewND = NewTD; 6695 } 6696 6697 if (!Redeclaration) 6698 PushOnScopeChains(NewND, S); 6699 6700 return NewND; 6701} 6702 6703Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6704 SourceLocation NamespaceLoc, 6705 SourceLocation AliasLoc, 6706 IdentifierInfo *Alias, 6707 CXXScopeSpec &SS, 6708 SourceLocation IdentLoc, 6709 IdentifierInfo *Ident) { 6710 6711 // Lookup the namespace name. 6712 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6713 LookupParsedName(R, S, &SS); 6714 6715 // Check if we have a previous declaration with the same name. 6716 NamedDecl *PrevDecl 6717 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6718 ForRedeclaration); 6719 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6720 PrevDecl = 0; 6721 6722 if (PrevDecl) { 6723 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6724 // We already have an alias with the same name that points to the same 6725 // namespace, so don't create a new one. 6726 // FIXME: At some point, we'll want to create the (redundant) 6727 // declaration to maintain better source information. 6728 if (!R.isAmbiguous() && !R.empty() && 6729 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6730 return 0; 6731 } 6732 6733 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6734 diag::err_redefinition_different_kind; 6735 Diag(AliasLoc, DiagID) << Alias; 6736 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6737 return 0; 6738 } 6739 6740 if (R.isAmbiguous()) 6741 return 0; 6742 6743 if (R.empty()) { 6744 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6745 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6746 return 0; 6747 } 6748 } 6749 6750 NamespaceAliasDecl *AliasDecl = 6751 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6752 Alias, SS.getWithLocInContext(Context), 6753 IdentLoc, R.getFoundDecl()); 6754 6755 PushOnScopeChains(AliasDecl, S); 6756 return AliasDecl; 6757} 6758 6759namespace { 6760 /// \brief Scoped object used to handle the state changes required in Sema 6761 /// to implicitly define the body of a C++ member function; 6762 class ImplicitlyDefinedFunctionScope { 6763 Sema &S; 6764 Sema::ContextRAII SavedContext; 6765 6766 public: 6767 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6768 : S(S), SavedContext(S, Method) 6769 { 6770 S.PushFunctionScope(); 6771 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6772 } 6773 6774 ~ImplicitlyDefinedFunctionScope() { 6775 S.PopExpressionEvaluationContext(); 6776 S.PopFunctionScopeInfo(); 6777 } 6778 }; 6779} 6780 6781Sema::ImplicitExceptionSpecification 6782Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6783 // C++ [except.spec]p14: 6784 // An implicitly declared special member function (Clause 12) shall have an 6785 // exception-specification. [...] 6786 ImplicitExceptionSpecification ExceptSpec(Context); 6787 if (ClassDecl->isInvalidDecl()) 6788 return ExceptSpec; 6789 6790 // Direct base-class constructors. 6791 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6792 BEnd = ClassDecl->bases_end(); 6793 B != BEnd; ++B) { 6794 if (B->isVirtual()) // Handled below. 6795 continue; 6796 6797 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6798 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6799 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6800 // If this is a deleted function, add it anyway. This might be conformant 6801 // with the standard. This might not. I'm not sure. It might not matter. 6802 if (Constructor) 6803 ExceptSpec.CalledDecl(Constructor); 6804 } 6805 } 6806 6807 // Virtual base-class constructors. 6808 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6809 BEnd = ClassDecl->vbases_end(); 6810 B != BEnd; ++B) { 6811 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6812 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6813 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6814 // If this is a deleted function, add it anyway. This might be conformant 6815 // with the standard. This might not. I'm not sure. It might not matter. 6816 if (Constructor) 6817 ExceptSpec.CalledDecl(Constructor); 6818 } 6819 } 6820 6821 // Field constructors. 6822 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6823 FEnd = ClassDecl->field_end(); 6824 F != FEnd; ++F) { 6825 if (F->hasInClassInitializer()) { 6826 if (Expr *E = F->getInClassInitializer()) 6827 ExceptSpec.CalledExpr(E); 6828 else if (!F->isInvalidDecl()) 6829 ExceptSpec.SetDelayed(); 6830 } else if (const RecordType *RecordTy 6831 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6832 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6833 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6834 // If this is a deleted function, add it anyway. This might be conformant 6835 // with the standard. This might not. I'm not sure. It might not matter. 6836 // In particular, the problem is that this function never gets called. It 6837 // might just be ill-formed because this function attempts to refer to 6838 // a deleted function here. 6839 if (Constructor) 6840 ExceptSpec.CalledDecl(Constructor); 6841 } 6842 } 6843 6844 return ExceptSpec; 6845} 6846 6847CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6848 CXXRecordDecl *ClassDecl) { 6849 // C++ [class.ctor]p5: 6850 // A default constructor for a class X is a constructor of class X 6851 // that can be called without an argument. If there is no 6852 // user-declared constructor for class X, a default constructor is 6853 // implicitly declared. An implicitly-declared default constructor 6854 // is an inline public member of its class. 6855 assert(!ClassDecl->hasUserDeclaredConstructor() && 6856 "Should not build implicit default constructor!"); 6857 6858 ImplicitExceptionSpecification Spec = 6859 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6860 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6861 6862 // Create the actual constructor declaration. 6863 CanQualType ClassType 6864 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6865 SourceLocation ClassLoc = ClassDecl->getLocation(); 6866 DeclarationName Name 6867 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6868 DeclarationNameInfo NameInfo(Name, ClassLoc); 6869 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6870 Context, ClassDecl, ClassLoc, NameInfo, 6871 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6872 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6873 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6874 getLangOptions().CPlusPlus0x); 6875 DefaultCon->setAccess(AS_public); 6876 DefaultCon->setDefaulted(); 6877 DefaultCon->setImplicit(); 6878 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6879 6880 // Note that we have declared this constructor. 6881 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6882 6883 if (Scope *S = getScopeForContext(ClassDecl)) 6884 PushOnScopeChains(DefaultCon, S, false); 6885 ClassDecl->addDecl(DefaultCon); 6886 6887 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6888 DefaultCon->setDeletedAsWritten(); 6889 6890 return DefaultCon; 6891} 6892 6893void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6894 CXXConstructorDecl *Constructor) { 6895 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6896 !Constructor->doesThisDeclarationHaveABody() && 6897 !Constructor->isDeleted()) && 6898 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6899 6900 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6901 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6902 6903 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6904 DiagnosticErrorTrap Trap(Diags); 6905 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6906 Trap.hasErrorOccurred()) { 6907 Diag(CurrentLocation, diag::note_member_synthesized_at) 6908 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6909 Constructor->setInvalidDecl(); 6910 return; 6911 } 6912 6913 SourceLocation Loc = Constructor->getLocation(); 6914 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6915 6916 Constructor->setUsed(); 6917 MarkVTableUsed(CurrentLocation, ClassDecl); 6918 6919 if (ASTMutationListener *L = getASTMutationListener()) { 6920 L->CompletedImplicitDefinition(Constructor); 6921 } 6922} 6923 6924/// Get any existing defaulted default constructor for the given class. Do not 6925/// implicitly define one if it does not exist. 6926static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6927 CXXRecordDecl *D) { 6928 ASTContext &Context = Self.Context; 6929 QualType ClassType = Context.getTypeDeclType(D); 6930 DeclarationName ConstructorName 6931 = Context.DeclarationNames.getCXXConstructorName( 6932 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6933 6934 DeclContext::lookup_const_iterator Con, ConEnd; 6935 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6936 Con != ConEnd; ++Con) { 6937 // A function template cannot be defaulted. 6938 if (isa<FunctionTemplateDecl>(*Con)) 6939 continue; 6940 6941 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6942 if (Constructor->isDefaultConstructor()) 6943 return Constructor->isDefaulted() ? Constructor : 0; 6944 } 6945 return 0; 6946} 6947 6948void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6949 if (!D) return; 6950 AdjustDeclIfTemplate(D); 6951 6952 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6953 CXXConstructorDecl *CtorDecl 6954 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6955 6956 if (!CtorDecl) return; 6957 6958 // Compute the exception specification for the default constructor. 6959 const FunctionProtoType *CtorTy = 6960 CtorDecl->getType()->castAs<FunctionProtoType>(); 6961 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6962 ImplicitExceptionSpecification Spec = 6963 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6964 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6965 assert(EPI.ExceptionSpecType != EST_Delayed); 6966 6967 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6968 } 6969 6970 // If the default constructor is explicitly defaulted, checking the exception 6971 // specification is deferred until now. 6972 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6973 !ClassDecl->isDependentType()) 6974 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6975} 6976 6977void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6978 // We start with an initial pass over the base classes to collect those that 6979 // inherit constructors from. If there are none, we can forgo all further 6980 // processing. 6981 typedef SmallVector<const RecordType *, 4> BasesVector; 6982 BasesVector BasesToInheritFrom; 6983 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6984 BaseE = ClassDecl->bases_end(); 6985 BaseIt != BaseE; ++BaseIt) { 6986 if (BaseIt->getInheritConstructors()) { 6987 QualType Base = BaseIt->getType(); 6988 if (Base->isDependentType()) { 6989 // If we inherit constructors from anything that is dependent, just 6990 // abort processing altogether. We'll get another chance for the 6991 // instantiations. 6992 return; 6993 } 6994 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6995 } 6996 } 6997 if (BasesToInheritFrom.empty()) 6998 return; 6999 7000 // Now collect the constructors that we already have in the current class. 7001 // Those take precedence over inherited constructors. 7002 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7003 // unless there is a user-declared constructor with the same signature in 7004 // the class where the using-declaration appears. 7005 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7006 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7007 CtorE = ClassDecl->ctor_end(); 7008 CtorIt != CtorE; ++CtorIt) { 7009 ExistingConstructors.insert( 7010 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7011 } 7012 7013 Scope *S = getScopeForContext(ClassDecl); 7014 DeclarationName CreatedCtorName = 7015 Context.DeclarationNames.getCXXConstructorName( 7016 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7017 7018 // Now comes the true work. 7019 // First, we keep a map from constructor types to the base that introduced 7020 // them. Needed for finding conflicting constructors. We also keep the 7021 // actually inserted declarations in there, for pretty diagnostics. 7022 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7023 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7024 ConstructorToSourceMap InheritedConstructors; 7025 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7026 BaseE = BasesToInheritFrom.end(); 7027 BaseIt != BaseE; ++BaseIt) { 7028 const RecordType *Base = *BaseIt; 7029 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7030 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7031 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7032 CtorE = BaseDecl->ctor_end(); 7033 CtorIt != CtorE; ++CtorIt) { 7034 // Find the using declaration for inheriting this base's constructors. 7035 DeclarationName Name = 7036 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7037 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7038 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7039 SourceLocation UsingLoc = UD ? UD->getLocation() : 7040 ClassDecl->getLocation(); 7041 7042 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7043 // from the class X named in the using-declaration consists of actual 7044 // constructors and notional constructors that result from the 7045 // transformation of defaulted parameters as follows: 7046 // - all non-template default constructors of X, and 7047 // - for each non-template constructor of X that has at least one 7048 // parameter with a default argument, the set of constructors that 7049 // results from omitting any ellipsis parameter specification and 7050 // successively omitting parameters with a default argument from the 7051 // end of the parameter-type-list. 7052 CXXConstructorDecl *BaseCtor = *CtorIt; 7053 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7054 const FunctionProtoType *BaseCtorType = 7055 BaseCtor->getType()->getAs<FunctionProtoType>(); 7056 7057 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7058 maxParams = BaseCtor->getNumParams(); 7059 params <= maxParams; ++params) { 7060 // Skip default constructors. They're never inherited. 7061 if (params == 0) 7062 continue; 7063 // Skip copy and move constructors for the same reason. 7064 if (CanBeCopyOrMove && params == 1) 7065 continue; 7066 7067 // Build up a function type for this particular constructor. 7068 // FIXME: The working paper does not consider that the exception spec 7069 // for the inheriting constructor might be larger than that of the 7070 // source. This code doesn't yet, either. When it does, this code will 7071 // need to be delayed until after exception specifications and in-class 7072 // member initializers are attached. 7073 const Type *NewCtorType; 7074 if (params == maxParams) 7075 NewCtorType = BaseCtorType; 7076 else { 7077 SmallVector<QualType, 16> Args; 7078 for (unsigned i = 0; i < params; ++i) { 7079 Args.push_back(BaseCtorType->getArgType(i)); 7080 } 7081 FunctionProtoType::ExtProtoInfo ExtInfo = 7082 BaseCtorType->getExtProtoInfo(); 7083 ExtInfo.Variadic = false; 7084 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7085 Args.data(), params, ExtInfo) 7086 .getTypePtr(); 7087 } 7088 const Type *CanonicalNewCtorType = 7089 Context.getCanonicalType(NewCtorType); 7090 7091 // Now that we have the type, first check if the class already has a 7092 // constructor with this signature. 7093 if (ExistingConstructors.count(CanonicalNewCtorType)) 7094 continue; 7095 7096 // Then we check if we have already declared an inherited constructor 7097 // with this signature. 7098 std::pair<ConstructorToSourceMap::iterator, bool> result = 7099 InheritedConstructors.insert(std::make_pair( 7100 CanonicalNewCtorType, 7101 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7102 if (!result.second) { 7103 // Already in the map. If it came from a different class, that's an 7104 // error. Not if it's from the same. 7105 CanQualType PreviousBase = result.first->second.first; 7106 if (CanonicalBase != PreviousBase) { 7107 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7108 const CXXConstructorDecl *PrevBaseCtor = 7109 PrevCtor->getInheritedConstructor(); 7110 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7111 7112 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7113 Diag(BaseCtor->getLocation(), 7114 diag::note_using_decl_constructor_conflict_current_ctor); 7115 Diag(PrevBaseCtor->getLocation(), 7116 diag::note_using_decl_constructor_conflict_previous_ctor); 7117 Diag(PrevCtor->getLocation(), 7118 diag::note_using_decl_constructor_conflict_previous_using); 7119 } 7120 continue; 7121 } 7122 7123 // OK, we're there, now add the constructor. 7124 // C++0x [class.inhctor]p8: [...] that would be performed by a 7125 // user-written inline constructor [...] 7126 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7127 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7128 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7129 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7130 /*ImplicitlyDeclared=*/true, 7131 // FIXME: Due to a defect in the standard, we treat inherited 7132 // constructors as constexpr even if that makes them ill-formed. 7133 /*Constexpr=*/BaseCtor->isConstexpr()); 7134 NewCtor->setAccess(BaseCtor->getAccess()); 7135 7136 // Build up the parameter decls and add them. 7137 SmallVector<ParmVarDecl *, 16> ParamDecls; 7138 for (unsigned i = 0; i < params; ++i) { 7139 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7140 UsingLoc, UsingLoc, 7141 /*IdentifierInfo=*/0, 7142 BaseCtorType->getArgType(i), 7143 /*TInfo=*/0, SC_None, 7144 SC_None, /*DefaultArg=*/0)); 7145 } 7146 NewCtor->setParams(ParamDecls); 7147 NewCtor->setInheritedConstructor(BaseCtor); 7148 7149 PushOnScopeChains(NewCtor, S, false); 7150 ClassDecl->addDecl(NewCtor); 7151 result.first->second.second = NewCtor; 7152 } 7153 } 7154 } 7155} 7156 7157Sema::ImplicitExceptionSpecification 7158Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7159 // C++ [except.spec]p14: 7160 // An implicitly declared special member function (Clause 12) shall have 7161 // an exception-specification. 7162 ImplicitExceptionSpecification ExceptSpec(Context); 7163 if (ClassDecl->isInvalidDecl()) 7164 return ExceptSpec; 7165 7166 // Direct base-class destructors. 7167 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7168 BEnd = ClassDecl->bases_end(); 7169 B != BEnd; ++B) { 7170 if (B->isVirtual()) // Handled below. 7171 continue; 7172 7173 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7174 ExceptSpec.CalledDecl( 7175 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7176 } 7177 7178 // Virtual base-class destructors. 7179 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7180 BEnd = ClassDecl->vbases_end(); 7181 B != BEnd; ++B) { 7182 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7183 ExceptSpec.CalledDecl( 7184 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7185 } 7186 7187 // Field destructors. 7188 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7189 FEnd = ClassDecl->field_end(); 7190 F != FEnd; ++F) { 7191 if (const RecordType *RecordTy 7192 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7193 ExceptSpec.CalledDecl( 7194 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7195 } 7196 7197 return ExceptSpec; 7198} 7199 7200CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7201 // C++ [class.dtor]p2: 7202 // If a class has no user-declared destructor, a destructor is 7203 // declared implicitly. An implicitly-declared destructor is an 7204 // inline public member of its class. 7205 7206 ImplicitExceptionSpecification Spec = 7207 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7208 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7209 7210 // Create the actual destructor declaration. 7211 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7212 7213 CanQualType ClassType 7214 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7215 SourceLocation ClassLoc = ClassDecl->getLocation(); 7216 DeclarationName Name 7217 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7218 DeclarationNameInfo NameInfo(Name, ClassLoc); 7219 CXXDestructorDecl *Destructor 7220 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7221 /*isInline=*/true, 7222 /*isImplicitlyDeclared=*/true); 7223 Destructor->setAccess(AS_public); 7224 Destructor->setDefaulted(); 7225 Destructor->setImplicit(); 7226 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7227 7228 // Note that we have declared this destructor. 7229 ++ASTContext::NumImplicitDestructorsDeclared; 7230 7231 // Introduce this destructor into its scope. 7232 if (Scope *S = getScopeForContext(ClassDecl)) 7233 PushOnScopeChains(Destructor, S, false); 7234 ClassDecl->addDecl(Destructor); 7235 7236 // This could be uniqued if it ever proves significant. 7237 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7238 7239 if (ShouldDeleteDestructor(Destructor)) 7240 Destructor->setDeletedAsWritten(); 7241 7242 AddOverriddenMethods(ClassDecl, Destructor); 7243 7244 return Destructor; 7245} 7246 7247void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7248 CXXDestructorDecl *Destructor) { 7249 assert((Destructor->isDefaulted() && 7250 !Destructor->doesThisDeclarationHaveABody()) && 7251 "DefineImplicitDestructor - call it for implicit default dtor"); 7252 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7253 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7254 7255 if (Destructor->isInvalidDecl()) 7256 return; 7257 7258 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7259 7260 DiagnosticErrorTrap Trap(Diags); 7261 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7262 Destructor->getParent()); 7263 7264 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7265 Diag(CurrentLocation, diag::note_member_synthesized_at) 7266 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7267 7268 Destructor->setInvalidDecl(); 7269 return; 7270 } 7271 7272 SourceLocation Loc = Destructor->getLocation(); 7273 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7274 Destructor->setImplicitlyDefined(true); 7275 Destructor->setUsed(); 7276 MarkVTableUsed(CurrentLocation, ClassDecl); 7277 7278 if (ASTMutationListener *L = getASTMutationListener()) { 7279 L->CompletedImplicitDefinition(Destructor); 7280 } 7281} 7282 7283void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7284 CXXDestructorDecl *destructor) { 7285 // C++11 [class.dtor]p3: 7286 // A declaration of a destructor that does not have an exception- 7287 // specification is implicitly considered to have the same exception- 7288 // specification as an implicit declaration. 7289 const FunctionProtoType *dtorType = destructor->getType()-> 7290 getAs<FunctionProtoType>(); 7291 if (dtorType->hasExceptionSpec()) 7292 return; 7293 7294 ImplicitExceptionSpecification exceptSpec = 7295 ComputeDefaultedDtorExceptionSpec(classDecl); 7296 7297 // Replace the destructor's type, building off the existing one. Fortunately, 7298 // the only thing of interest in the destructor type is its extended info. 7299 // The return and arguments are fixed. 7300 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7301 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7302 epi.NumExceptions = exceptSpec.size(); 7303 epi.Exceptions = exceptSpec.data(); 7304 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7305 7306 destructor->setType(ty); 7307 7308 // FIXME: If the destructor has a body that could throw, and the newly created 7309 // spec doesn't allow exceptions, we should emit a warning, because this 7310 // change in behavior can break conforming C++03 programs at runtime. 7311 // However, we don't have a body yet, so it needs to be done somewhere else. 7312} 7313 7314/// \brief Builds a statement that copies/moves the given entity from \p From to 7315/// \c To. 7316/// 7317/// This routine is used to copy/move the members of a class with an 7318/// implicitly-declared copy/move assignment operator. When the entities being 7319/// copied are arrays, this routine builds for loops to copy them. 7320/// 7321/// \param S The Sema object used for type-checking. 7322/// 7323/// \param Loc The location where the implicit copy/move is being generated. 7324/// 7325/// \param T The type of the expressions being copied/moved. Both expressions 7326/// must have this type. 7327/// 7328/// \param To The expression we are copying/moving to. 7329/// 7330/// \param From The expression we are copying/moving from. 7331/// 7332/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7333/// Otherwise, it's a non-static member subobject. 7334/// 7335/// \param Copying Whether we're copying or moving. 7336/// 7337/// \param Depth Internal parameter recording the depth of the recursion. 7338/// 7339/// \returns A statement or a loop that copies the expressions. 7340static StmtResult 7341BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7342 Expr *To, Expr *From, 7343 bool CopyingBaseSubobject, bool Copying, 7344 unsigned Depth = 0) { 7345 // C++0x [class.copy]p28: 7346 // Each subobject is assigned in the manner appropriate to its type: 7347 // 7348 // - if the subobject is of class type, as if by a call to operator= with 7349 // the subobject as the object expression and the corresponding 7350 // subobject of x as a single function argument (as if by explicit 7351 // qualification; that is, ignoring any possible virtual overriding 7352 // functions in more derived classes); 7353 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7354 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7355 7356 // Look for operator=. 7357 DeclarationName Name 7358 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7359 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7360 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7361 7362 // Filter out any result that isn't a copy/move-assignment operator. 7363 LookupResult::Filter F = OpLookup.makeFilter(); 7364 while (F.hasNext()) { 7365 NamedDecl *D = F.next(); 7366 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7367 if (Copying ? Method->isCopyAssignmentOperator() : 7368 Method->isMoveAssignmentOperator()) 7369 continue; 7370 7371 F.erase(); 7372 } 7373 F.done(); 7374 7375 // Suppress the protected check (C++ [class.protected]) for each of the 7376 // assignment operators we found. This strange dance is required when 7377 // we're assigning via a base classes's copy-assignment operator. To 7378 // ensure that we're getting the right base class subobject (without 7379 // ambiguities), we need to cast "this" to that subobject type; to 7380 // ensure that we don't go through the virtual call mechanism, we need 7381 // to qualify the operator= name with the base class (see below). However, 7382 // this means that if the base class has a protected copy assignment 7383 // operator, the protected member access check will fail. So, we 7384 // rewrite "protected" access to "public" access in this case, since we 7385 // know by construction that we're calling from a derived class. 7386 if (CopyingBaseSubobject) { 7387 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7388 L != LEnd; ++L) { 7389 if (L.getAccess() == AS_protected) 7390 L.setAccess(AS_public); 7391 } 7392 } 7393 7394 // Create the nested-name-specifier that will be used to qualify the 7395 // reference to operator=; this is required to suppress the virtual 7396 // call mechanism. 7397 CXXScopeSpec SS; 7398 SS.MakeTrivial(S.Context, 7399 NestedNameSpecifier::Create(S.Context, 0, false, 7400 T.getTypePtr()), 7401 Loc); 7402 7403 // Create the reference to operator=. 7404 ExprResult OpEqualRef 7405 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7406 /*FirstQualifierInScope=*/0, OpLookup, 7407 /*TemplateArgs=*/0, 7408 /*SuppressQualifierCheck=*/true); 7409 if (OpEqualRef.isInvalid()) 7410 return StmtError(); 7411 7412 // Build the call to the assignment operator. 7413 7414 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7415 OpEqualRef.takeAs<Expr>(), 7416 Loc, &From, 1, Loc); 7417 if (Call.isInvalid()) 7418 return StmtError(); 7419 7420 return S.Owned(Call.takeAs<Stmt>()); 7421 } 7422 7423 // - if the subobject is of scalar type, the built-in assignment 7424 // operator is used. 7425 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7426 if (!ArrayTy) { 7427 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7428 if (Assignment.isInvalid()) 7429 return StmtError(); 7430 7431 return S.Owned(Assignment.takeAs<Stmt>()); 7432 } 7433 7434 // - if the subobject is an array, each element is assigned, in the 7435 // manner appropriate to the element type; 7436 7437 // Construct a loop over the array bounds, e.g., 7438 // 7439 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7440 // 7441 // that will copy each of the array elements. 7442 QualType SizeType = S.Context.getSizeType(); 7443 7444 // Create the iteration variable. 7445 IdentifierInfo *IterationVarName = 0; 7446 { 7447 llvm::SmallString<8> Str; 7448 llvm::raw_svector_ostream OS(Str); 7449 OS << "__i" << Depth; 7450 IterationVarName = &S.Context.Idents.get(OS.str()); 7451 } 7452 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7453 IterationVarName, SizeType, 7454 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7455 SC_None, SC_None); 7456 7457 // Initialize the iteration variable to zero. 7458 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7459 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7460 7461 // Create a reference to the iteration variable; we'll use this several 7462 // times throughout. 7463 Expr *IterationVarRef 7464 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7465 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7466 7467 // Create the DeclStmt that holds the iteration variable. 7468 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7469 7470 // Create the comparison against the array bound. 7471 llvm::APInt Upper 7472 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7473 Expr *Comparison 7474 = new (S.Context) BinaryOperator(IterationVarRef, 7475 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7476 BO_NE, S.Context.BoolTy, 7477 VK_RValue, OK_Ordinary, Loc); 7478 7479 // Create the pre-increment of the iteration variable. 7480 Expr *Increment 7481 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7482 VK_LValue, OK_Ordinary, Loc); 7483 7484 // Subscript the "from" and "to" expressions with the iteration variable. 7485 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7486 IterationVarRef, Loc)); 7487 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7488 IterationVarRef, Loc)); 7489 if (!Copying) // Cast to rvalue 7490 From = CastForMoving(S, From); 7491 7492 // Build the copy/move for an individual element of the array. 7493 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7494 To, From, CopyingBaseSubobject, 7495 Copying, Depth + 1); 7496 if (Copy.isInvalid()) 7497 return StmtError(); 7498 7499 // Construct the loop that copies all elements of this array. 7500 return S.ActOnForStmt(Loc, Loc, InitStmt, 7501 S.MakeFullExpr(Comparison), 7502 0, S.MakeFullExpr(Increment), 7503 Loc, Copy.take()); 7504} 7505 7506std::pair<Sema::ImplicitExceptionSpecification, bool> 7507Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7508 CXXRecordDecl *ClassDecl) { 7509 if (ClassDecl->isInvalidDecl()) 7510 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7511 7512 // C++ [class.copy]p10: 7513 // If the class definition does not explicitly declare a copy 7514 // assignment operator, one is declared implicitly. 7515 // The implicitly-defined copy assignment operator for a class X 7516 // will have the form 7517 // 7518 // X& X::operator=(const X&) 7519 // 7520 // if 7521 bool HasConstCopyAssignment = true; 7522 7523 // -- each direct base class B of X has a copy assignment operator 7524 // whose parameter is of type const B&, const volatile B& or B, 7525 // and 7526 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7527 BaseEnd = ClassDecl->bases_end(); 7528 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7529 // We'll handle this below 7530 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7531 continue; 7532 7533 assert(!Base->getType()->isDependentType() && 7534 "Cannot generate implicit members for class with dependent bases."); 7535 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7536 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7537 &HasConstCopyAssignment); 7538 } 7539 7540 // In C++11, the above citation has "or virtual" added 7541 if (LangOpts.CPlusPlus0x) { 7542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7543 BaseEnd = ClassDecl->vbases_end(); 7544 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7545 assert(!Base->getType()->isDependentType() && 7546 "Cannot generate implicit members for class with dependent bases."); 7547 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7548 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7549 &HasConstCopyAssignment); 7550 } 7551 } 7552 7553 // -- for all the nonstatic data members of X that are of a class 7554 // type M (or array thereof), each such class type has a copy 7555 // assignment operator whose parameter is of type const M&, 7556 // const volatile M& or M. 7557 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7558 FieldEnd = ClassDecl->field_end(); 7559 HasConstCopyAssignment && Field != FieldEnd; 7560 ++Field) { 7561 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7562 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7563 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7564 &HasConstCopyAssignment); 7565 } 7566 } 7567 7568 // Otherwise, the implicitly declared copy assignment operator will 7569 // have the form 7570 // 7571 // X& X::operator=(X&) 7572 7573 // C++ [except.spec]p14: 7574 // An implicitly declared special member function (Clause 12) shall have an 7575 // exception-specification. [...] 7576 7577 // It is unspecified whether or not an implicit copy assignment operator 7578 // attempts to deduplicate calls to assignment operators of virtual bases are 7579 // made. As such, this exception specification is effectively unspecified. 7580 // Based on a similar decision made for constness in C++0x, we're erring on 7581 // the side of assuming such calls to be made regardless of whether they 7582 // actually happen. 7583 ImplicitExceptionSpecification ExceptSpec(Context); 7584 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7585 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7586 BaseEnd = ClassDecl->bases_end(); 7587 Base != BaseEnd; ++Base) { 7588 if (Base->isVirtual()) 7589 continue; 7590 7591 CXXRecordDecl *BaseClassDecl 7592 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7593 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7594 ArgQuals, false, 0)) 7595 ExceptSpec.CalledDecl(CopyAssign); 7596 } 7597 7598 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7599 BaseEnd = ClassDecl->vbases_end(); 7600 Base != BaseEnd; ++Base) { 7601 CXXRecordDecl *BaseClassDecl 7602 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7603 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7604 ArgQuals, false, 0)) 7605 ExceptSpec.CalledDecl(CopyAssign); 7606 } 7607 7608 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7609 FieldEnd = ClassDecl->field_end(); 7610 Field != FieldEnd; 7611 ++Field) { 7612 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7613 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7614 if (CXXMethodDecl *CopyAssign = 7615 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7616 ExceptSpec.CalledDecl(CopyAssign); 7617 } 7618 } 7619 7620 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7621} 7622 7623CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7624 // Note: The following rules are largely analoguous to the copy 7625 // constructor rules. Note that virtual bases are not taken into account 7626 // for determining the argument type of the operator. Note also that 7627 // operators taking an object instead of a reference are allowed. 7628 7629 ImplicitExceptionSpecification Spec(Context); 7630 bool Const; 7631 llvm::tie(Spec, Const) = 7632 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7633 7634 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7635 QualType RetType = Context.getLValueReferenceType(ArgType); 7636 if (Const) 7637 ArgType = ArgType.withConst(); 7638 ArgType = Context.getLValueReferenceType(ArgType); 7639 7640 // An implicitly-declared copy assignment operator is an inline public 7641 // member of its class. 7642 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7643 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7644 SourceLocation ClassLoc = ClassDecl->getLocation(); 7645 DeclarationNameInfo NameInfo(Name, ClassLoc); 7646 CXXMethodDecl *CopyAssignment 7647 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7648 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7649 /*TInfo=*/0, /*isStatic=*/false, 7650 /*StorageClassAsWritten=*/SC_None, 7651 /*isInline=*/true, /*isConstexpr=*/false, 7652 SourceLocation()); 7653 CopyAssignment->setAccess(AS_public); 7654 CopyAssignment->setDefaulted(); 7655 CopyAssignment->setImplicit(); 7656 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7657 7658 // Add the parameter to the operator. 7659 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7660 ClassLoc, ClassLoc, /*Id=*/0, 7661 ArgType, /*TInfo=*/0, 7662 SC_None, 7663 SC_None, 0); 7664 CopyAssignment->setParams(FromParam); 7665 7666 // Note that we have added this copy-assignment operator. 7667 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7668 7669 if (Scope *S = getScopeForContext(ClassDecl)) 7670 PushOnScopeChains(CopyAssignment, S, false); 7671 ClassDecl->addDecl(CopyAssignment); 7672 7673 // C++0x [class.copy]p18: 7674 // ... If the class definition declares a move constructor or move 7675 // assignment operator, the implicitly declared copy assignment operator is 7676 // defined as deleted; ... 7677 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7678 ClassDecl->hasUserDeclaredMoveAssignment() || 7679 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7680 CopyAssignment->setDeletedAsWritten(); 7681 7682 AddOverriddenMethods(ClassDecl, CopyAssignment); 7683 return CopyAssignment; 7684} 7685 7686void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7687 CXXMethodDecl *CopyAssignOperator) { 7688 assert((CopyAssignOperator->isDefaulted() && 7689 CopyAssignOperator->isOverloadedOperator() && 7690 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7691 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7692 "DefineImplicitCopyAssignment called for wrong function"); 7693 7694 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7695 7696 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7697 CopyAssignOperator->setInvalidDecl(); 7698 return; 7699 } 7700 7701 CopyAssignOperator->setUsed(); 7702 7703 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7704 DiagnosticErrorTrap Trap(Diags); 7705 7706 // C++0x [class.copy]p30: 7707 // The implicitly-defined or explicitly-defaulted copy assignment operator 7708 // for a non-union class X performs memberwise copy assignment of its 7709 // subobjects. The direct base classes of X are assigned first, in the 7710 // order of their declaration in the base-specifier-list, and then the 7711 // immediate non-static data members of X are assigned, in the order in 7712 // which they were declared in the class definition. 7713 7714 // The statements that form the synthesized function body. 7715 ASTOwningVector<Stmt*> Statements(*this); 7716 7717 // The parameter for the "other" object, which we are copying from. 7718 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7719 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7720 QualType OtherRefType = Other->getType(); 7721 if (const LValueReferenceType *OtherRef 7722 = OtherRefType->getAs<LValueReferenceType>()) { 7723 OtherRefType = OtherRef->getPointeeType(); 7724 OtherQuals = OtherRefType.getQualifiers(); 7725 } 7726 7727 // Our location for everything implicitly-generated. 7728 SourceLocation Loc = CopyAssignOperator->getLocation(); 7729 7730 // Construct a reference to the "other" object. We'll be using this 7731 // throughout the generated ASTs. 7732 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7733 assert(OtherRef && "Reference to parameter cannot fail!"); 7734 7735 // Construct the "this" pointer. We'll be using this throughout the generated 7736 // ASTs. 7737 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7738 assert(This && "Reference to this cannot fail!"); 7739 7740 // Assign base classes. 7741 bool Invalid = false; 7742 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7743 E = ClassDecl->bases_end(); Base != E; ++Base) { 7744 // Form the assignment: 7745 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7746 QualType BaseType = Base->getType().getUnqualifiedType(); 7747 if (!BaseType->isRecordType()) { 7748 Invalid = true; 7749 continue; 7750 } 7751 7752 CXXCastPath BasePath; 7753 BasePath.push_back(Base); 7754 7755 // Construct the "from" expression, which is an implicit cast to the 7756 // appropriately-qualified base type. 7757 Expr *From = OtherRef; 7758 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7759 CK_UncheckedDerivedToBase, 7760 VK_LValue, &BasePath).take(); 7761 7762 // Dereference "this". 7763 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7764 7765 // Implicitly cast "this" to the appropriately-qualified base type. 7766 To = ImpCastExprToType(To.take(), 7767 Context.getCVRQualifiedType(BaseType, 7768 CopyAssignOperator->getTypeQualifiers()), 7769 CK_UncheckedDerivedToBase, 7770 VK_LValue, &BasePath); 7771 7772 // Build the copy. 7773 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7774 To.get(), From, 7775 /*CopyingBaseSubobject=*/true, 7776 /*Copying=*/true); 7777 if (Copy.isInvalid()) { 7778 Diag(CurrentLocation, diag::note_member_synthesized_at) 7779 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7780 CopyAssignOperator->setInvalidDecl(); 7781 return; 7782 } 7783 7784 // Success! Record the copy. 7785 Statements.push_back(Copy.takeAs<Expr>()); 7786 } 7787 7788 // \brief Reference to the __builtin_memcpy function. 7789 Expr *BuiltinMemCpyRef = 0; 7790 // \brief Reference to the __builtin_objc_memmove_collectable function. 7791 Expr *CollectableMemCpyRef = 0; 7792 7793 // Assign non-static members. 7794 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7795 FieldEnd = ClassDecl->field_end(); 7796 Field != FieldEnd; ++Field) { 7797 if (Field->isUnnamedBitfield()) 7798 continue; 7799 7800 // Check for members of reference type; we can't copy those. 7801 if (Field->getType()->isReferenceType()) { 7802 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7803 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7804 Diag(Field->getLocation(), diag::note_declared_at); 7805 Diag(CurrentLocation, diag::note_member_synthesized_at) 7806 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7807 Invalid = true; 7808 continue; 7809 } 7810 7811 // Check for members of const-qualified, non-class type. 7812 QualType BaseType = Context.getBaseElementType(Field->getType()); 7813 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7814 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7815 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7816 Diag(Field->getLocation(), diag::note_declared_at); 7817 Diag(CurrentLocation, diag::note_member_synthesized_at) 7818 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7819 Invalid = true; 7820 continue; 7821 } 7822 7823 // Suppress assigning zero-width bitfields. 7824 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7825 continue; 7826 7827 QualType FieldType = Field->getType().getNonReferenceType(); 7828 if (FieldType->isIncompleteArrayType()) { 7829 assert(ClassDecl->hasFlexibleArrayMember() && 7830 "Incomplete array type is not valid"); 7831 continue; 7832 } 7833 7834 // Build references to the field in the object we're copying from and to. 7835 CXXScopeSpec SS; // Intentionally empty 7836 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7837 LookupMemberName); 7838 MemberLookup.addDecl(*Field); 7839 MemberLookup.resolveKind(); 7840 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7841 Loc, /*IsArrow=*/false, 7842 SS, 0, MemberLookup, 0); 7843 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7844 Loc, /*IsArrow=*/true, 7845 SS, 0, MemberLookup, 0); 7846 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7847 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7848 7849 // If the field should be copied with __builtin_memcpy rather than via 7850 // explicit assignments, do so. This optimization only applies for arrays 7851 // of scalars and arrays of class type with trivial copy-assignment 7852 // operators. 7853 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7854 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7855 // Compute the size of the memory buffer to be copied. 7856 QualType SizeType = Context.getSizeType(); 7857 llvm::APInt Size(Context.getTypeSize(SizeType), 7858 Context.getTypeSizeInChars(BaseType).getQuantity()); 7859 for (const ConstantArrayType *Array 7860 = Context.getAsConstantArrayType(FieldType); 7861 Array; 7862 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7863 llvm::APInt ArraySize 7864 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7865 Size *= ArraySize; 7866 } 7867 7868 // Take the address of the field references for "from" and "to". 7869 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7870 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7871 7872 bool NeedsCollectableMemCpy = 7873 (BaseType->isRecordType() && 7874 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7875 7876 if (NeedsCollectableMemCpy) { 7877 if (!CollectableMemCpyRef) { 7878 // Create a reference to the __builtin_objc_memmove_collectable function. 7879 LookupResult R(*this, 7880 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7881 Loc, LookupOrdinaryName); 7882 LookupName(R, TUScope, true); 7883 7884 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7885 if (!CollectableMemCpy) { 7886 // Something went horribly wrong earlier, and we will have 7887 // complained about it. 7888 Invalid = true; 7889 continue; 7890 } 7891 7892 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7893 CollectableMemCpy->getType(), 7894 VK_LValue, Loc, 0).take(); 7895 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7896 } 7897 } 7898 // Create a reference to the __builtin_memcpy builtin function. 7899 else if (!BuiltinMemCpyRef) { 7900 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7901 LookupOrdinaryName); 7902 LookupName(R, TUScope, true); 7903 7904 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7905 if (!BuiltinMemCpy) { 7906 // Something went horribly wrong earlier, and we will have complained 7907 // about it. 7908 Invalid = true; 7909 continue; 7910 } 7911 7912 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7913 BuiltinMemCpy->getType(), 7914 VK_LValue, Loc, 0).take(); 7915 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7916 } 7917 7918 ASTOwningVector<Expr*> CallArgs(*this); 7919 CallArgs.push_back(To.takeAs<Expr>()); 7920 CallArgs.push_back(From.takeAs<Expr>()); 7921 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7922 ExprResult Call = ExprError(); 7923 if (NeedsCollectableMemCpy) 7924 Call = ActOnCallExpr(/*Scope=*/0, 7925 CollectableMemCpyRef, 7926 Loc, move_arg(CallArgs), 7927 Loc); 7928 else 7929 Call = ActOnCallExpr(/*Scope=*/0, 7930 BuiltinMemCpyRef, 7931 Loc, move_arg(CallArgs), 7932 Loc); 7933 7934 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7935 Statements.push_back(Call.takeAs<Expr>()); 7936 continue; 7937 } 7938 7939 // Build the copy of this field. 7940 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7941 To.get(), From.get(), 7942 /*CopyingBaseSubobject=*/false, 7943 /*Copying=*/true); 7944 if (Copy.isInvalid()) { 7945 Diag(CurrentLocation, diag::note_member_synthesized_at) 7946 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7947 CopyAssignOperator->setInvalidDecl(); 7948 return; 7949 } 7950 7951 // Success! Record the copy. 7952 Statements.push_back(Copy.takeAs<Stmt>()); 7953 } 7954 7955 if (!Invalid) { 7956 // Add a "return *this;" 7957 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7958 7959 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7960 if (Return.isInvalid()) 7961 Invalid = true; 7962 else { 7963 Statements.push_back(Return.takeAs<Stmt>()); 7964 7965 if (Trap.hasErrorOccurred()) { 7966 Diag(CurrentLocation, diag::note_member_synthesized_at) 7967 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7968 Invalid = true; 7969 } 7970 } 7971 } 7972 7973 if (Invalid) { 7974 CopyAssignOperator->setInvalidDecl(); 7975 return; 7976 } 7977 7978 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7979 /*isStmtExpr=*/false); 7980 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7981 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7982 7983 if (ASTMutationListener *L = getASTMutationListener()) { 7984 L->CompletedImplicitDefinition(CopyAssignOperator); 7985 } 7986} 7987 7988Sema::ImplicitExceptionSpecification 7989Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7990 ImplicitExceptionSpecification ExceptSpec(Context); 7991 7992 if (ClassDecl->isInvalidDecl()) 7993 return ExceptSpec; 7994 7995 // C++0x [except.spec]p14: 7996 // An implicitly declared special member function (Clause 12) shall have an 7997 // exception-specification. [...] 7998 7999 // It is unspecified whether or not an implicit move assignment operator 8000 // attempts to deduplicate calls to assignment operators of virtual bases are 8001 // made. As such, this exception specification is effectively unspecified. 8002 // Based on a similar decision made for constness in C++0x, we're erring on 8003 // the side of assuming such calls to be made regardless of whether they 8004 // actually happen. 8005 // Note that a move constructor is not implicitly declared when there are 8006 // virtual bases, but it can still be user-declared and explicitly defaulted. 8007 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8008 BaseEnd = ClassDecl->bases_end(); 8009 Base != BaseEnd; ++Base) { 8010 if (Base->isVirtual()) 8011 continue; 8012 8013 CXXRecordDecl *BaseClassDecl 8014 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8015 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8016 false, 0)) 8017 ExceptSpec.CalledDecl(MoveAssign); 8018 } 8019 8020 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8021 BaseEnd = ClassDecl->vbases_end(); 8022 Base != BaseEnd; ++Base) { 8023 CXXRecordDecl *BaseClassDecl 8024 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8025 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8026 false, 0)) 8027 ExceptSpec.CalledDecl(MoveAssign); 8028 } 8029 8030 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8031 FieldEnd = ClassDecl->field_end(); 8032 Field != FieldEnd; 8033 ++Field) { 8034 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8035 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8036 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8037 false, 0)) 8038 ExceptSpec.CalledDecl(MoveAssign); 8039 } 8040 } 8041 8042 return ExceptSpec; 8043} 8044 8045CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8046 // Note: The following rules are largely analoguous to the move 8047 // constructor rules. 8048 8049 ImplicitExceptionSpecification Spec( 8050 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8051 8052 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8053 QualType RetType = Context.getLValueReferenceType(ArgType); 8054 ArgType = Context.getRValueReferenceType(ArgType); 8055 8056 // An implicitly-declared move assignment operator is an inline public 8057 // member of its class. 8058 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8059 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8060 SourceLocation ClassLoc = ClassDecl->getLocation(); 8061 DeclarationNameInfo NameInfo(Name, ClassLoc); 8062 CXXMethodDecl *MoveAssignment 8063 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8064 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8065 /*TInfo=*/0, /*isStatic=*/false, 8066 /*StorageClassAsWritten=*/SC_None, 8067 /*isInline=*/true, 8068 /*isConstexpr=*/false, 8069 SourceLocation()); 8070 MoveAssignment->setAccess(AS_public); 8071 MoveAssignment->setDefaulted(); 8072 MoveAssignment->setImplicit(); 8073 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8074 8075 // Add the parameter to the operator. 8076 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8077 ClassLoc, ClassLoc, /*Id=*/0, 8078 ArgType, /*TInfo=*/0, 8079 SC_None, 8080 SC_None, 0); 8081 MoveAssignment->setParams(FromParam); 8082 8083 // Note that we have added this copy-assignment operator. 8084 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8085 8086 // C++0x [class.copy]p9: 8087 // If the definition of a class X does not explicitly declare a move 8088 // assignment operator, one will be implicitly declared as defaulted if and 8089 // only if: 8090 // [...] 8091 // - the move assignment operator would not be implicitly defined as 8092 // deleted. 8093 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8094 // Cache this result so that we don't try to generate this over and over 8095 // on every lookup, leaking memory and wasting time. 8096 ClassDecl->setFailedImplicitMoveAssignment(); 8097 return 0; 8098 } 8099 8100 if (Scope *S = getScopeForContext(ClassDecl)) 8101 PushOnScopeChains(MoveAssignment, S, false); 8102 ClassDecl->addDecl(MoveAssignment); 8103 8104 AddOverriddenMethods(ClassDecl, MoveAssignment); 8105 return MoveAssignment; 8106} 8107 8108void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8109 CXXMethodDecl *MoveAssignOperator) { 8110 assert((MoveAssignOperator->isDefaulted() && 8111 MoveAssignOperator->isOverloadedOperator() && 8112 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8113 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8114 "DefineImplicitMoveAssignment called for wrong function"); 8115 8116 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8117 8118 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8119 MoveAssignOperator->setInvalidDecl(); 8120 return; 8121 } 8122 8123 MoveAssignOperator->setUsed(); 8124 8125 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8126 DiagnosticErrorTrap Trap(Diags); 8127 8128 // C++0x [class.copy]p28: 8129 // The implicitly-defined or move assignment operator for a non-union class 8130 // X performs memberwise move assignment of its subobjects. The direct base 8131 // classes of X are assigned first, in the order of their declaration in the 8132 // base-specifier-list, and then the immediate non-static data members of X 8133 // are assigned, in the order in which they were declared in the class 8134 // definition. 8135 8136 // The statements that form the synthesized function body. 8137 ASTOwningVector<Stmt*> Statements(*this); 8138 8139 // The parameter for the "other" object, which we are move from. 8140 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8141 QualType OtherRefType = Other->getType()-> 8142 getAs<RValueReferenceType>()->getPointeeType(); 8143 assert(OtherRefType.getQualifiers() == 0 && 8144 "Bad argument type of defaulted move assignment"); 8145 8146 // Our location for everything implicitly-generated. 8147 SourceLocation Loc = MoveAssignOperator->getLocation(); 8148 8149 // Construct a reference to the "other" object. We'll be using this 8150 // throughout the generated ASTs. 8151 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8152 assert(OtherRef && "Reference to parameter cannot fail!"); 8153 // Cast to rvalue. 8154 OtherRef = CastForMoving(*this, OtherRef); 8155 8156 // Construct the "this" pointer. We'll be using this throughout the generated 8157 // ASTs. 8158 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8159 assert(This && "Reference to this cannot fail!"); 8160 8161 // Assign base classes. 8162 bool Invalid = false; 8163 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8164 E = ClassDecl->bases_end(); Base != E; ++Base) { 8165 // Form the assignment: 8166 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8167 QualType BaseType = Base->getType().getUnqualifiedType(); 8168 if (!BaseType->isRecordType()) { 8169 Invalid = true; 8170 continue; 8171 } 8172 8173 CXXCastPath BasePath; 8174 BasePath.push_back(Base); 8175 8176 // Construct the "from" expression, which is an implicit cast to the 8177 // appropriately-qualified base type. 8178 Expr *From = OtherRef; 8179 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8180 VK_XValue, &BasePath).take(); 8181 8182 // Dereference "this". 8183 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8184 8185 // Implicitly cast "this" to the appropriately-qualified base type. 8186 To = ImpCastExprToType(To.take(), 8187 Context.getCVRQualifiedType(BaseType, 8188 MoveAssignOperator->getTypeQualifiers()), 8189 CK_UncheckedDerivedToBase, 8190 VK_LValue, &BasePath); 8191 8192 // Build the move. 8193 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8194 To.get(), From, 8195 /*CopyingBaseSubobject=*/true, 8196 /*Copying=*/false); 8197 if (Move.isInvalid()) { 8198 Diag(CurrentLocation, diag::note_member_synthesized_at) 8199 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8200 MoveAssignOperator->setInvalidDecl(); 8201 return; 8202 } 8203 8204 // Success! Record the move. 8205 Statements.push_back(Move.takeAs<Expr>()); 8206 } 8207 8208 // \brief Reference to the __builtin_memcpy function. 8209 Expr *BuiltinMemCpyRef = 0; 8210 // \brief Reference to the __builtin_objc_memmove_collectable function. 8211 Expr *CollectableMemCpyRef = 0; 8212 8213 // Assign non-static members. 8214 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8215 FieldEnd = ClassDecl->field_end(); 8216 Field != FieldEnd; ++Field) { 8217 if (Field->isUnnamedBitfield()) 8218 continue; 8219 8220 // Check for members of reference type; we can't move those. 8221 if (Field->getType()->isReferenceType()) { 8222 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8223 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8224 Diag(Field->getLocation(), diag::note_declared_at); 8225 Diag(CurrentLocation, diag::note_member_synthesized_at) 8226 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8227 Invalid = true; 8228 continue; 8229 } 8230 8231 // Check for members of const-qualified, non-class type. 8232 QualType BaseType = Context.getBaseElementType(Field->getType()); 8233 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8234 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8235 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8236 Diag(Field->getLocation(), diag::note_declared_at); 8237 Diag(CurrentLocation, diag::note_member_synthesized_at) 8238 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8239 Invalid = true; 8240 continue; 8241 } 8242 8243 // Suppress assigning zero-width bitfields. 8244 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8245 continue; 8246 8247 QualType FieldType = Field->getType().getNonReferenceType(); 8248 if (FieldType->isIncompleteArrayType()) { 8249 assert(ClassDecl->hasFlexibleArrayMember() && 8250 "Incomplete array type is not valid"); 8251 continue; 8252 } 8253 8254 // Build references to the field in the object we're copying from and to. 8255 CXXScopeSpec SS; // Intentionally empty 8256 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8257 LookupMemberName); 8258 MemberLookup.addDecl(*Field); 8259 MemberLookup.resolveKind(); 8260 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8261 Loc, /*IsArrow=*/false, 8262 SS, 0, MemberLookup, 0); 8263 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8264 Loc, /*IsArrow=*/true, 8265 SS, 0, MemberLookup, 0); 8266 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8267 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8268 8269 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8270 "Member reference with rvalue base must be rvalue except for reference " 8271 "members, which aren't allowed for move assignment."); 8272 8273 // If the field should be copied with __builtin_memcpy rather than via 8274 // explicit assignments, do so. This optimization only applies for arrays 8275 // of scalars and arrays of class type with trivial move-assignment 8276 // operators. 8277 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8278 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8279 // Compute the size of the memory buffer to be copied. 8280 QualType SizeType = Context.getSizeType(); 8281 llvm::APInt Size(Context.getTypeSize(SizeType), 8282 Context.getTypeSizeInChars(BaseType).getQuantity()); 8283 for (const ConstantArrayType *Array 8284 = Context.getAsConstantArrayType(FieldType); 8285 Array; 8286 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8287 llvm::APInt ArraySize 8288 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8289 Size *= ArraySize; 8290 } 8291 8292 // Take the address of the field references for "from" and "to". We 8293 // directly construct UnaryOperators here because semantic analysis 8294 // does not permit us to take the address of an xvalue. 8295 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8296 Context.getPointerType(From.get()->getType()), 8297 VK_RValue, OK_Ordinary, Loc); 8298 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8299 Context.getPointerType(To.get()->getType()), 8300 VK_RValue, OK_Ordinary, Loc); 8301 8302 bool NeedsCollectableMemCpy = 8303 (BaseType->isRecordType() && 8304 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8305 8306 if (NeedsCollectableMemCpy) { 8307 if (!CollectableMemCpyRef) { 8308 // Create a reference to the __builtin_objc_memmove_collectable function. 8309 LookupResult R(*this, 8310 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8311 Loc, LookupOrdinaryName); 8312 LookupName(R, TUScope, true); 8313 8314 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8315 if (!CollectableMemCpy) { 8316 // Something went horribly wrong earlier, and we will have 8317 // complained about it. 8318 Invalid = true; 8319 continue; 8320 } 8321 8322 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8323 CollectableMemCpy->getType(), 8324 VK_LValue, Loc, 0).take(); 8325 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8326 } 8327 } 8328 // Create a reference to the __builtin_memcpy builtin function. 8329 else if (!BuiltinMemCpyRef) { 8330 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8331 LookupOrdinaryName); 8332 LookupName(R, TUScope, true); 8333 8334 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8335 if (!BuiltinMemCpy) { 8336 // Something went horribly wrong earlier, and we will have complained 8337 // about it. 8338 Invalid = true; 8339 continue; 8340 } 8341 8342 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8343 BuiltinMemCpy->getType(), 8344 VK_LValue, Loc, 0).take(); 8345 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8346 } 8347 8348 ASTOwningVector<Expr*> CallArgs(*this); 8349 CallArgs.push_back(To.takeAs<Expr>()); 8350 CallArgs.push_back(From.takeAs<Expr>()); 8351 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8352 ExprResult Call = ExprError(); 8353 if (NeedsCollectableMemCpy) 8354 Call = ActOnCallExpr(/*Scope=*/0, 8355 CollectableMemCpyRef, 8356 Loc, move_arg(CallArgs), 8357 Loc); 8358 else 8359 Call = ActOnCallExpr(/*Scope=*/0, 8360 BuiltinMemCpyRef, 8361 Loc, move_arg(CallArgs), 8362 Loc); 8363 8364 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8365 Statements.push_back(Call.takeAs<Expr>()); 8366 continue; 8367 } 8368 8369 // Build the move of this field. 8370 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8371 To.get(), From.get(), 8372 /*CopyingBaseSubobject=*/false, 8373 /*Copying=*/false); 8374 if (Move.isInvalid()) { 8375 Diag(CurrentLocation, diag::note_member_synthesized_at) 8376 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8377 MoveAssignOperator->setInvalidDecl(); 8378 return; 8379 } 8380 8381 // Success! Record the copy. 8382 Statements.push_back(Move.takeAs<Stmt>()); 8383 } 8384 8385 if (!Invalid) { 8386 // Add a "return *this;" 8387 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8388 8389 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8390 if (Return.isInvalid()) 8391 Invalid = true; 8392 else { 8393 Statements.push_back(Return.takeAs<Stmt>()); 8394 8395 if (Trap.hasErrorOccurred()) { 8396 Diag(CurrentLocation, diag::note_member_synthesized_at) 8397 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8398 Invalid = true; 8399 } 8400 } 8401 } 8402 8403 if (Invalid) { 8404 MoveAssignOperator->setInvalidDecl(); 8405 return; 8406 } 8407 8408 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8409 /*isStmtExpr=*/false); 8410 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8411 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8412 8413 if (ASTMutationListener *L = getASTMutationListener()) { 8414 L->CompletedImplicitDefinition(MoveAssignOperator); 8415 } 8416} 8417 8418std::pair<Sema::ImplicitExceptionSpecification, bool> 8419Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8420 if (ClassDecl->isInvalidDecl()) 8421 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8422 8423 // C++ [class.copy]p5: 8424 // The implicitly-declared copy constructor for a class X will 8425 // have the form 8426 // 8427 // X::X(const X&) 8428 // 8429 // if 8430 // FIXME: It ought to be possible to store this on the record. 8431 bool HasConstCopyConstructor = true; 8432 8433 // -- each direct or virtual base class B of X has a copy 8434 // constructor whose first parameter is of type const B& or 8435 // const volatile B&, and 8436 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8437 BaseEnd = ClassDecl->bases_end(); 8438 HasConstCopyConstructor && Base != BaseEnd; 8439 ++Base) { 8440 // Virtual bases are handled below. 8441 if (Base->isVirtual()) 8442 continue; 8443 8444 CXXRecordDecl *BaseClassDecl 8445 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8446 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8447 &HasConstCopyConstructor); 8448 } 8449 8450 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8451 BaseEnd = ClassDecl->vbases_end(); 8452 HasConstCopyConstructor && Base != BaseEnd; 8453 ++Base) { 8454 CXXRecordDecl *BaseClassDecl 8455 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8456 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8457 &HasConstCopyConstructor); 8458 } 8459 8460 // -- for all the nonstatic data members of X that are of a 8461 // class type M (or array thereof), each such class type 8462 // has a copy constructor whose first parameter is of type 8463 // const M& or const volatile M&. 8464 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8465 FieldEnd = ClassDecl->field_end(); 8466 HasConstCopyConstructor && Field != FieldEnd; 8467 ++Field) { 8468 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8469 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8470 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8471 &HasConstCopyConstructor); 8472 } 8473 } 8474 // Otherwise, the implicitly declared copy constructor will have 8475 // the form 8476 // 8477 // X::X(X&) 8478 8479 // C++ [except.spec]p14: 8480 // An implicitly declared special member function (Clause 12) shall have an 8481 // exception-specification. [...] 8482 ImplicitExceptionSpecification ExceptSpec(Context); 8483 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8484 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8485 BaseEnd = ClassDecl->bases_end(); 8486 Base != BaseEnd; 8487 ++Base) { 8488 // Virtual bases are handled below. 8489 if (Base->isVirtual()) 8490 continue; 8491 8492 CXXRecordDecl *BaseClassDecl 8493 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8494 if (CXXConstructorDecl *CopyConstructor = 8495 LookupCopyingConstructor(BaseClassDecl, Quals)) 8496 ExceptSpec.CalledDecl(CopyConstructor); 8497 } 8498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8499 BaseEnd = ClassDecl->vbases_end(); 8500 Base != BaseEnd; 8501 ++Base) { 8502 CXXRecordDecl *BaseClassDecl 8503 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8504 if (CXXConstructorDecl *CopyConstructor = 8505 LookupCopyingConstructor(BaseClassDecl, Quals)) 8506 ExceptSpec.CalledDecl(CopyConstructor); 8507 } 8508 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8509 FieldEnd = ClassDecl->field_end(); 8510 Field != FieldEnd; 8511 ++Field) { 8512 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8513 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8514 if (CXXConstructorDecl *CopyConstructor = 8515 LookupCopyingConstructor(FieldClassDecl, Quals)) 8516 ExceptSpec.CalledDecl(CopyConstructor); 8517 } 8518 } 8519 8520 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8521} 8522 8523CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8524 CXXRecordDecl *ClassDecl) { 8525 // C++ [class.copy]p4: 8526 // If the class definition does not explicitly declare a copy 8527 // constructor, one is declared implicitly. 8528 8529 ImplicitExceptionSpecification Spec(Context); 8530 bool Const; 8531 llvm::tie(Spec, Const) = 8532 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8533 8534 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8535 QualType ArgType = ClassType; 8536 if (Const) 8537 ArgType = ArgType.withConst(); 8538 ArgType = Context.getLValueReferenceType(ArgType); 8539 8540 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8541 8542 DeclarationName Name 8543 = Context.DeclarationNames.getCXXConstructorName( 8544 Context.getCanonicalType(ClassType)); 8545 SourceLocation ClassLoc = ClassDecl->getLocation(); 8546 DeclarationNameInfo NameInfo(Name, ClassLoc); 8547 8548 // An implicitly-declared copy constructor is an inline public 8549 // member of its class. 8550 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8551 Context, ClassDecl, ClassLoc, NameInfo, 8552 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8553 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8554 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8555 getLangOptions().CPlusPlus0x); 8556 CopyConstructor->setAccess(AS_public); 8557 CopyConstructor->setDefaulted(); 8558 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8559 8560 // Note that we have declared this constructor. 8561 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8562 8563 // Add the parameter to the constructor. 8564 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8565 ClassLoc, ClassLoc, 8566 /*IdentifierInfo=*/0, 8567 ArgType, /*TInfo=*/0, 8568 SC_None, 8569 SC_None, 0); 8570 CopyConstructor->setParams(FromParam); 8571 8572 if (Scope *S = getScopeForContext(ClassDecl)) 8573 PushOnScopeChains(CopyConstructor, S, false); 8574 ClassDecl->addDecl(CopyConstructor); 8575 8576 // C++0x [class.copy]p7: 8577 // ... If the class definition declares a move constructor or move 8578 // assignment operator, the implicitly declared constructor is defined as 8579 // deleted; ... 8580 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8581 ClassDecl->hasUserDeclaredMoveAssignment() || 8582 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8583 CopyConstructor->setDeletedAsWritten(); 8584 8585 return CopyConstructor; 8586} 8587 8588void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8589 CXXConstructorDecl *CopyConstructor) { 8590 assert((CopyConstructor->isDefaulted() && 8591 CopyConstructor->isCopyConstructor() && 8592 !CopyConstructor->doesThisDeclarationHaveABody()) && 8593 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8594 8595 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8596 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8597 8598 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8599 DiagnosticErrorTrap Trap(Diags); 8600 8601 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8602 Trap.hasErrorOccurred()) { 8603 Diag(CurrentLocation, diag::note_member_synthesized_at) 8604 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8605 CopyConstructor->setInvalidDecl(); 8606 } else { 8607 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8608 CopyConstructor->getLocation(), 8609 MultiStmtArg(*this, 0, 0), 8610 /*isStmtExpr=*/false) 8611 .takeAs<Stmt>()); 8612 CopyConstructor->setImplicitlyDefined(true); 8613 } 8614 8615 CopyConstructor->setUsed(); 8616 if (ASTMutationListener *L = getASTMutationListener()) { 8617 L->CompletedImplicitDefinition(CopyConstructor); 8618 } 8619} 8620 8621Sema::ImplicitExceptionSpecification 8622Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8623 // C++ [except.spec]p14: 8624 // An implicitly declared special member function (Clause 12) shall have an 8625 // exception-specification. [...] 8626 ImplicitExceptionSpecification ExceptSpec(Context); 8627 if (ClassDecl->isInvalidDecl()) 8628 return ExceptSpec; 8629 8630 // Direct base-class constructors. 8631 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8632 BEnd = ClassDecl->bases_end(); 8633 B != BEnd; ++B) { 8634 if (B->isVirtual()) // Handled below. 8635 continue; 8636 8637 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8638 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8639 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8640 // If this is a deleted function, add it anyway. This might be conformant 8641 // with the standard. This might not. I'm not sure. It might not matter. 8642 if (Constructor) 8643 ExceptSpec.CalledDecl(Constructor); 8644 } 8645 } 8646 8647 // Virtual base-class constructors. 8648 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8649 BEnd = ClassDecl->vbases_end(); 8650 B != BEnd; ++B) { 8651 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8652 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8653 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8654 // If this is a deleted function, add it anyway. This might be conformant 8655 // with the standard. This might not. I'm not sure. It might not matter. 8656 if (Constructor) 8657 ExceptSpec.CalledDecl(Constructor); 8658 } 8659 } 8660 8661 // Field constructors. 8662 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8663 FEnd = ClassDecl->field_end(); 8664 F != FEnd; ++F) { 8665 if (const RecordType *RecordTy 8666 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8667 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8668 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8669 // If this is a deleted function, add it anyway. This might be conformant 8670 // with the standard. This might not. I'm not sure. It might not matter. 8671 // In particular, the problem is that this function never gets called. It 8672 // might just be ill-formed because this function attempts to refer to 8673 // a deleted function here. 8674 if (Constructor) 8675 ExceptSpec.CalledDecl(Constructor); 8676 } 8677 } 8678 8679 return ExceptSpec; 8680} 8681 8682CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8683 CXXRecordDecl *ClassDecl) { 8684 ImplicitExceptionSpecification Spec( 8685 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8686 8687 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8688 QualType ArgType = Context.getRValueReferenceType(ClassType); 8689 8690 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8691 8692 DeclarationName Name 8693 = Context.DeclarationNames.getCXXConstructorName( 8694 Context.getCanonicalType(ClassType)); 8695 SourceLocation ClassLoc = ClassDecl->getLocation(); 8696 DeclarationNameInfo NameInfo(Name, ClassLoc); 8697 8698 // C++0x [class.copy]p11: 8699 // An implicitly-declared copy/move constructor is an inline public 8700 // member of its class. 8701 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8702 Context, ClassDecl, ClassLoc, NameInfo, 8703 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8704 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8705 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8706 getLangOptions().CPlusPlus0x); 8707 MoveConstructor->setAccess(AS_public); 8708 MoveConstructor->setDefaulted(); 8709 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8710 8711 // Add the parameter to the constructor. 8712 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8713 ClassLoc, ClassLoc, 8714 /*IdentifierInfo=*/0, 8715 ArgType, /*TInfo=*/0, 8716 SC_None, 8717 SC_None, 0); 8718 MoveConstructor->setParams(FromParam); 8719 8720 // C++0x [class.copy]p9: 8721 // If the definition of a class X does not explicitly declare a move 8722 // constructor, one will be implicitly declared as defaulted if and only if: 8723 // [...] 8724 // - the move constructor would not be implicitly defined as deleted. 8725 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8726 // Cache this result so that we don't try to generate this over and over 8727 // on every lookup, leaking memory and wasting time. 8728 ClassDecl->setFailedImplicitMoveConstructor(); 8729 return 0; 8730 } 8731 8732 // Note that we have declared this constructor. 8733 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8734 8735 if (Scope *S = getScopeForContext(ClassDecl)) 8736 PushOnScopeChains(MoveConstructor, S, false); 8737 ClassDecl->addDecl(MoveConstructor); 8738 8739 return MoveConstructor; 8740} 8741 8742void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8743 CXXConstructorDecl *MoveConstructor) { 8744 assert((MoveConstructor->isDefaulted() && 8745 MoveConstructor->isMoveConstructor() && 8746 !MoveConstructor->doesThisDeclarationHaveABody()) && 8747 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8748 8749 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8750 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8751 8752 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8753 DiagnosticErrorTrap Trap(Diags); 8754 8755 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8756 Trap.hasErrorOccurred()) { 8757 Diag(CurrentLocation, diag::note_member_synthesized_at) 8758 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8759 MoveConstructor->setInvalidDecl(); 8760 } else { 8761 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8762 MoveConstructor->getLocation(), 8763 MultiStmtArg(*this, 0, 0), 8764 /*isStmtExpr=*/false) 8765 .takeAs<Stmt>()); 8766 MoveConstructor->setImplicitlyDefined(true); 8767 } 8768 8769 MoveConstructor->setUsed(); 8770 8771 if (ASTMutationListener *L = getASTMutationListener()) { 8772 L->CompletedImplicitDefinition(MoveConstructor); 8773 } 8774} 8775 8776ExprResult 8777Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8778 CXXConstructorDecl *Constructor, 8779 MultiExprArg ExprArgs, 8780 bool HadMultipleCandidates, 8781 bool RequiresZeroInit, 8782 unsigned ConstructKind, 8783 SourceRange ParenRange) { 8784 bool Elidable = false; 8785 8786 // C++0x [class.copy]p34: 8787 // When certain criteria are met, an implementation is allowed to 8788 // omit the copy/move construction of a class object, even if the 8789 // copy/move constructor and/or destructor for the object have 8790 // side effects. [...] 8791 // - when a temporary class object that has not been bound to a 8792 // reference (12.2) would be copied/moved to a class object 8793 // with the same cv-unqualified type, the copy/move operation 8794 // can be omitted by constructing the temporary object 8795 // directly into the target of the omitted copy/move 8796 if (ConstructKind == CXXConstructExpr::CK_Complete && 8797 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8798 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8799 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8800 } 8801 8802 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8803 Elidable, move(ExprArgs), HadMultipleCandidates, 8804 RequiresZeroInit, ConstructKind, ParenRange); 8805} 8806 8807/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8808/// including handling of its default argument expressions. 8809ExprResult 8810Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8811 CXXConstructorDecl *Constructor, bool Elidable, 8812 MultiExprArg ExprArgs, 8813 bool HadMultipleCandidates, 8814 bool RequiresZeroInit, 8815 unsigned ConstructKind, 8816 SourceRange ParenRange) { 8817 unsigned NumExprs = ExprArgs.size(); 8818 Expr **Exprs = (Expr **)ExprArgs.release(); 8819 8820 for (specific_attr_iterator<NonNullAttr> 8821 i = Constructor->specific_attr_begin<NonNullAttr>(), 8822 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8823 const NonNullAttr *NonNull = *i; 8824 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8825 } 8826 8827 MarkDeclarationReferenced(ConstructLoc, Constructor); 8828 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8829 Constructor, Elidable, Exprs, NumExprs, 8830 HadMultipleCandidates, RequiresZeroInit, 8831 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8832 ParenRange)); 8833} 8834 8835bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8836 CXXConstructorDecl *Constructor, 8837 MultiExprArg Exprs, 8838 bool HadMultipleCandidates) { 8839 // FIXME: Provide the correct paren SourceRange when available. 8840 ExprResult TempResult = 8841 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8842 move(Exprs), HadMultipleCandidates, false, 8843 CXXConstructExpr::CK_Complete, SourceRange()); 8844 if (TempResult.isInvalid()) 8845 return true; 8846 8847 Expr *Temp = TempResult.takeAs<Expr>(); 8848 CheckImplicitConversions(Temp, VD->getLocation()); 8849 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8850 Temp = MaybeCreateExprWithCleanups(Temp); 8851 VD->setInit(Temp); 8852 8853 return false; 8854} 8855 8856void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8857 if (VD->isInvalidDecl()) return; 8858 8859 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8860 if (ClassDecl->isInvalidDecl()) return; 8861 if (ClassDecl->hasTrivialDestructor()) return; 8862 if (ClassDecl->isDependentContext()) return; 8863 8864 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8865 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8866 CheckDestructorAccess(VD->getLocation(), Destructor, 8867 PDiag(diag::err_access_dtor_var) 8868 << VD->getDeclName() 8869 << VD->getType()); 8870 8871 if (!VD->hasGlobalStorage()) return; 8872 8873 // Emit warning for non-trivial dtor in global scope (a real global, 8874 // class-static, function-static). 8875 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8876 8877 // TODO: this should be re-enabled for static locals by !CXAAtExit 8878 if (!VD->isStaticLocal()) 8879 Diag(VD->getLocation(), diag::warn_global_destructor); 8880} 8881 8882/// AddCXXDirectInitializerToDecl - This action is called immediately after 8883/// ActOnDeclarator, when a C++ direct initializer is present. 8884/// e.g: "int x(1);" 8885void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8886 SourceLocation LParenLoc, 8887 MultiExprArg Exprs, 8888 SourceLocation RParenLoc, 8889 bool TypeMayContainAuto) { 8890 // If there is no declaration, there was an error parsing it. Just ignore 8891 // the initializer. 8892 if (RealDecl == 0) 8893 return; 8894 8895 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8896 if (!VDecl) { 8897 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8898 RealDecl->setInvalidDecl(); 8899 return; 8900 } 8901 8902 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8903 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8904 if (Exprs.size() == 0) { 8905 // It isn't possible to write this directly, but it is possible to 8906 // end up in this situation with "auto x(some_pack...);" 8907 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 8908 << VDecl->getDeclName() << VDecl->getType() 8909 << VDecl->getSourceRange(); 8910 RealDecl->setInvalidDecl(); 8911 return; 8912 } 8913 8914 if (Exprs.size() > 1) { 8915 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8916 diag::err_auto_var_init_multiple_expressions) 8917 << VDecl->getDeclName() << VDecl->getType() 8918 << VDecl->getSourceRange(); 8919 RealDecl->setInvalidDecl(); 8920 return; 8921 } 8922 8923 Expr *Init = Exprs.get()[0]; 8924 TypeSourceInfo *DeducedType = 0; 8925 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8926 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8927 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8928 << Init->getSourceRange(); 8929 if (!DeducedType) { 8930 RealDecl->setInvalidDecl(); 8931 return; 8932 } 8933 VDecl->setTypeSourceInfo(DeducedType); 8934 VDecl->setType(DeducedType->getType()); 8935 8936 // In ARC, infer lifetime. 8937 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8938 VDecl->setInvalidDecl(); 8939 8940 // If this is a redeclaration, check that the type we just deduced matches 8941 // the previously declared type. 8942 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8943 MergeVarDeclTypes(VDecl, Old); 8944 } 8945 8946 // We will represent direct-initialization similarly to copy-initialization: 8947 // int x(1); -as-> int x = 1; 8948 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8949 // 8950 // Clients that want to distinguish between the two forms, can check for 8951 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8952 // A major benefit is that clients that don't particularly care about which 8953 // exactly form was it (like the CodeGen) can handle both cases without 8954 // special case code. 8955 8956 // C++ 8.5p11: 8957 // The form of initialization (using parentheses or '=') is generally 8958 // insignificant, but does matter when the entity being initialized has a 8959 // class type. 8960 8961 if (!VDecl->getType()->isDependentType() && 8962 !VDecl->getType()->isIncompleteArrayType() && 8963 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8964 diag::err_typecheck_decl_incomplete_type)) { 8965 VDecl->setInvalidDecl(); 8966 return; 8967 } 8968 8969 // The variable can not have an abstract class type. 8970 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8971 diag::err_abstract_type_in_decl, 8972 AbstractVariableType)) 8973 VDecl->setInvalidDecl(); 8974 8975 const VarDecl *Def; 8976 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8977 Diag(VDecl->getLocation(), diag::err_redefinition) 8978 << VDecl->getDeclName(); 8979 Diag(Def->getLocation(), diag::note_previous_definition); 8980 VDecl->setInvalidDecl(); 8981 return; 8982 } 8983 8984 // C++ [class.static.data]p4 8985 // If a static data member is of const integral or const 8986 // enumeration type, its declaration in the class definition can 8987 // specify a constant-initializer which shall be an integral 8988 // constant expression (5.19). In that case, the member can appear 8989 // in integral constant expressions. The member shall still be 8990 // defined in a namespace scope if it is used in the program and the 8991 // namespace scope definition shall not contain an initializer. 8992 // 8993 // We already performed a redefinition check above, but for static 8994 // data members we also need to check whether there was an in-class 8995 // declaration with an initializer. 8996 const VarDecl* PrevInit = 0; 8997 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8998 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8999 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9000 return; 9001 } 9002 9003 bool IsDependent = false; 9004 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9005 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9006 VDecl->setInvalidDecl(); 9007 return; 9008 } 9009 9010 if (Exprs.get()[I]->isTypeDependent()) 9011 IsDependent = true; 9012 } 9013 9014 // If either the declaration has a dependent type or if any of the 9015 // expressions is type-dependent, we represent the initialization 9016 // via a ParenListExpr for later use during template instantiation. 9017 if (VDecl->getType()->isDependentType() || IsDependent) { 9018 // Let clients know that initialization was done with a direct initializer. 9019 VDecl->setCXXDirectInitializer(true); 9020 9021 // Store the initialization expressions as a ParenListExpr. 9022 unsigned NumExprs = Exprs.size(); 9023 VDecl->setInit(new (Context) ParenListExpr( 9024 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9025 VDecl->getType().getNonReferenceType())); 9026 return; 9027 } 9028 9029 // Capture the variable that is being initialized and the style of 9030 // initialization. 9031 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9032 9033 // FIXME: Poor source location information. 9034 InitializationKind Kind 9035 = InitializationKind::CreateDirect(VDecl->getLocation(), 9036 LParenLoc, RParenLoc); 9037 9038 QualType T = VDecl->getType(); 9039 InitializationSequence InitSeq(*this, Entity, Kind, 9040 Exprs.get(), Exprs.size()); 9041 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9042 if (Result.isInvalid()) { 9043 VDecl->setInvalidDecl(); 9044 return; 9045 } else if (T != VDecl->getType()) { 9046 VDecl->setType(T); 9047 Result.get()->setType(T); 9048 } 9049 9050 9051 Expr *Init = Result.get(); 9052 CheckImplicitConversions(Init, LParenLoc); 9053 9054 Init = MaybeCreateExprWithCleanups(Init); 9055 VDecl->setInit(Init); 9056 VDecl->setCXXDirectInitializer(true); 9057 9058 CheckCompleteVariableDeclaration(VDecl); 9059} 9060 9061/// \brief Given a constructor and the set of arguments provided for the 9062/// constructor, convert the arguments and add any required default arguments 9063/// to form a proper call to this constructor. 9064/// 9065/// \returns true if an error occurred, false otherwise. 9066bool 9067Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9068 MultiExprArg ArgsPtr, 9069 SourceLocation Loc, 9070 ASTOwningVector<Expr*> &ConvertedArgs) { 9071 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9072 unsigned NumArgs = ArgsPtr.size(); 9073 Expr **Args = (Expr **)ArgsPtr.get(); 9074 9075 const FunctionProtoType *Proto 9076 = Constructor->getType()->getAs<FunctionProtoType>(); 9077 assert(Proto && "Constructor without a prototype?"); 9078 unsigned NumArgsInProto = Proto->getNumArgs(); 9079 9080 // If too few arguments are available, we'll fill in the rest with defaults. 9081 if (NumArgs < NumArgsInProto) 9082 ConvertedArgs.reserve(NumArgsInProto); 9083 else 9084 ConvertedArgs.reserve(NumArgs); 9085 9086 VariadicCallType CallType = 9087 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9088 SmallVector<Expr *, 8> AllArgs; 9089 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9090 Proto, 0, Args, NumArgs, AllArgs, 9091 CallType); 9092 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9093 ConvertedArgs.push_back(AllArgs[i]); 9094 return Invalid; 9095} 9096 9097static inline bool 9098CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9099 const FunctionDecl *FnDecl) { 9100 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9101 if (isa<NamespaceDecl>(DC)) { 9102 return SemaRef.Diag(FnDecl->getLocation(), 9103 diag::err_operator_new_delete_declared_in_namespace) 9104 << FnDecl->getDeclName(); 9105 } 9106 9107 if (isa<TranslationUnitDecl>(DC) && 9108 FnDecl->getStorageClass() == SC_Static) { 9109 return SemaRef.Diag(FnDecl->getLocation(), 9110 diag::err_operator_new_delete_declared_static) 9111 << FnDecl->getDeclName(); 9112 } 9113 9114 return false; 9115} 9116 9117static inline bool 9118CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9119 CanQualType ExpectedResultType, 9120 CanQualType ExpectedFirstParamType, 9121 unsigned DependentParamTypeDiag, 9122 unsigned InvalidParamTypeDiag) { 9123 QualType ResultType = 9124 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9125 9126 // Check that the result type is not dependent. 9127 if (ResultType->isDependentType()) 9128 return SemaRef.Diag(FnDecl->getLocation(), 9129 diag::err_operator_new_delete_dependent_result_type) 9130 << FnDecl->getDeclName() << ExpectedResultType; 9131 9132 // Check that the result type is what we expect. 9133 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9134 return SemaRef.Diag(FnDecl->getLocation(), 9135 diag::err_operator_new_delete_invalid_result_type) 9136 << FnDecl->getDeclName() << ExpectedResultType; 9137 9138 // A function template must have at least 2 parameters. 9139 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9140 return SemaRef.Diag(FnDecl->getLocation(), 9141 diag::err_operator_new_delete_template_too_few_parameters) 9142 << FnDecl->getDeclName(); 9143 9144 // The function decl must have at least 1 parameter. 9145 if (FnDecl->getNumParams() == 0) 9146 return SemaRef.Diag(FnDecl->getLocation(), 9147 diag::err_operator_new_delete_too_few_parameters) 9148 << FnDecl->getDeclName(); 9149 9150 // Check the the first parameter type is not dependent. 9151 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9152 if (FirstParamType->isDependentType()) 9153 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9154 << FnDecl->getDeclName() << ExpectedFirstParamType; 9155 9156 // Check that the first parameter type is what we expect. 9157 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9158 ExpectedFirstParamType) 9159 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9160 << FnDecl->getDeclName() << ExpectedFirstParamType; 9161 9162 return false; 9163} 9164 9165static bool 9166CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9167 // C++ [basic.stc.dynamic.allocation]p1: 9168 // A program is ill-formed if an allocation function is declared in a 9169 // namespace scope other than global scope or declared static in global 9170 // scope. 9171 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9172 return true; 9173 9174 CanQualType SizeTy = 9175 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9176 9177 // C++ [basic.stc.dynamic.allocation]p1: 9178 // The return type shall be void*. The first parameter shall have type 9179 // std::size_t. 9180 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9181 SizeTy, 9182 diag::err_operator_new_dependent_param_type, 9183 diag::err_operator_new_param_type)) 9184 return true; 9185 9186 // C++ [basic.stc.dynamic.allocation]p1: 9187 // The first parameter shall not have an associated default argument. 9188 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9189 return SemaRef.Diag(FnDecl->getLocation(), 9190 diag::err_operator_new_default_arg) 9191 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9192 9193 return false; 9194} 9195 9196static bool 9197CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9198 // C++ [basic.stc.dynamic.deallocation]p1: 9199 // A program is ill-formed if deallocation functions are declared in a 9200 // namespace scope other than global scope or declared static in global 9201 // scope. 9202 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9203 return true; 9204 9205 // C++ [basic.stc.dynamic.deallocation]p2: 9206 // Each deallocation function shall return void and its first parameter 9207 // shall be void*. 9208 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9209 SemaRef.Context.VoidPtrTy, 9210 diag::err_operator_delete_dependent_param_type, 9211 diag::err_operator_delete_param_type)) 9212 return true; 9213 9214 return false; 9215} 9216 9217/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9218/// of this overloaded operator is well-formed. If so, returns false; 9219/// otherwise, emits appropriate diagnostics and returns true. 9220bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9221 assert(FnDecl && FnDecl->isOverloadedOperator() && 9222 "Expected an overloaded operator declaration"); 9223 9224 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9225 9226 // C++ [over.oper]p5: 9227 // The allocation and deallocation functions, operator new, 9228 // operator new[], operator delete and operator delete[], are 9229 // described completely in 3.7.3. The attributes and restrictions 9230 // found in the rest of this subclause do not apply to them unless 9231 // explicitly stated in 3.7.3. 9232 if (Op == OO_Delete || Op == OO_Array_Delete) 9233 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9234 9235 if (Op == OO_New || Op == OO_Array_New) 9236 return CheckOperatorNewDeclaration(*this, FnDecl); 9237 9238 // C++ [over.oper]p6: 9239 // An operator function shall either be a non-static member 9240 // function or be a non-member function and have at least one 9241 // parameter whose type is a class, a reference to a class, an 9242 // enumeration, or a reference to an enumeration. 9243 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9244 if (MethodDecl->isStatic()) 9245 return Diag(FnDecl->getLocation(), 9246 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9247 } else { 9248 bool ClassOrEnumParam = false; 9249 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9250 ParamEnd = FnDecl->param_end(); 9251 Param != ParamEnd; ++Param) { 9252 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9253 if (ParamType->isDependentType() || ParamType->isRecordType() || 9254 ParamType->isEnumeralType()) { 9255 ClassOrEnumParam = true; 9256 break; 9257 } 9258 } 9259 9260 if (!ClassOrEnumParam) 9261 return Diag(FnDecl->getLocation(), 9262 diag::err_operator_overload_needs_class_or_enum) 9263 << FnDecl->getDeclName(); 9264 } 9265 9266 // C++ [over.oper]p8: 9267 // An operator function cannot have default arguments (8.3.6), 9268 // except where explicitly stated below. 9269 // 9270 // Only the function-call operator allows default arguments 9271 // (C++ [over.call]p1). 9272 if (Op != OO_Call) { 9273 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9274 Param != FnDecl->param_end(); ++Param) { 9275 if ((*Param)->hasDefaultArg()) 9276 return Diag((*Param)->getLocation(), 9277 diag::err_operator_overload_default_arg) 9278 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9279 } 9280 } 9281 9282 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9283 { false, false, false } 9284#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9285 , { Unary, Binary, MemberOnly } 9286#include "clang/Basic/OperatorKinds.def" 9287 }; 9288 9289 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9290 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9291 bool MustBeMemberOperator = OperatorUses[Op][2]; 9292 9293 // C++ [over.oper]p8: 9294 // [...] Operator functions cannot have more or fewer parameters 9295 // than the number required for the corresponding operator, as 9296 // described in the rest of this subclause. 9297 unsigned NumParams = FnDecl->getNumParams() 9298 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9299 if (Op != OO_Call && 9300 ((NumParams == 1 && !CanBeUnaryOperator) || 9301 (NumParams == 2 && !CanBeBinaryOperator) || 9302 (NumParams < 1) || (NumParams > 2))) { 9303 // We have the wrong number of parameters. 9304 unsigned ErrorKind; 9305 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9306 ErrorKind = 2; // 2 -> unary or binary. 9307 } else if (CanBeUnaryOperator) { 9308 ErrorKind = 0; // 0 -> unary 9309 } else { 9310 assert(CanBeBinaryOperator && 9311 "All non-call overloaded operators are unary or binary!"); 9312 ErrorKind = 1; // 1 -> binary 9313 } 9314 9315 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9316 << FnDecl->getDeclName() << NumParams << ErrorKind; 9317 } 9318 9319 // Overloaded operators other than operator() cannot be variadic. 9320 if (Op != OO_Call && 9321 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9322 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9323 << FnDecl->getDeclName(); 9324 } 9325 9326 // Some operators must be non-static member functions. 9327 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9328 return Diag(FnDecl->getLocation(), 9329 diag::err_operator_overload_must_be_member) 9330 << FnDecl->getDeclName(); 9331 } 9332 9333 // C++ [over.inc]p1: 9334 // The user-defined function called operator++ implements the 9335 // prefix and postfix ++ operator. If this function is a member 9336 // function with no parameters, or a non-member function with one 9337 // parameter of class or enumeration type, it defines the prefix 9338 // increment operator ++ for objects of that type. If the function 9339 // is a member function with one parameter (which shall be of type 9340 // int) or a non-member function with two parameters (the second 9341 // of which shall be of type int), it defines the postfix 9342 // increment operator ++ for objects of that type. 9343 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9344 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9345 bool ParamIsInt = false; 9346 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9347 ParamIsInt = BT->getKind() == BuiltinType::Int; 9348 9349 if (!ParamIsInt) 9350 return Diag(LastParam->getLocation(), 9351 diag::err_operator_overload_post_incdec_must_be_int) 9352 << LastParam->getType() << (Op == OO_MinusMinus); 9353 } 9354 9355 return false; 9356} 9357 9358/// CheckLiteralOperatorDeclaration - Check whether the declaration 9359/// of this literal operator function is well-formed. If so, returns 9360/// false; otherwise, emits appropriate diagnostics and returns true. 9361bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9362 DeclContext *DC = FnDecl->getDeclContext(); 9363 Decl::Kind Kind = DC->getDeclKind(); 9364 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9365 Kind != Decl::LinkageSpec) { 9366 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9367 << FnDecl->getDeclName(); 9368 return true; 9369 } 9370 9371 bool Valid = false; 9372 9373 // template <char...> type operator "" name() is the only valid template 9374 // signature, and the only valid signature with no parameters. 9375 if (FnDecl->param_size() == 0) { 9376 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9377 // Must have only one template parameter 9378 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9379 if (Params->size() == 1) { 9380 NonTypeTemplateParmDecl *PmDecl = 9381 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9382 9383 // The template parameter must be a char parameter pack. 9384 if (PmDecl && PmDecl->isTemplateParameterPack() && 9385 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9386 Valid = true; 9387 } 9388 } 9389 } else { 9390 // Check the first parameter 9391 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9392 9393 QualType T = (*Param)->getType(); 9394 9395 // unsigned long long int, long double, and any character type are allowed 9396 // as the only parameters. 9397 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9398 Context.hasSameType(T, Context.LongDoubleTy) || 9399 Context.hasSameType(T, Context.CharTy) || 9400 Context.hasSameType(T, Context.WCharTy) || 9401 Context.hasSameType(T, Context.Char16Ty) || 9402 Context.hasSameType(T, Context.Char32Ty)) { 9403 if (++Param == FnDecl->param_end()) 9404 Valid = true; 9405 goto FinishedParams; 9406 } 9407 9408 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9409 const PointerType *PT = T->getAs<PointerType>(); 9410 if (!PT) 9411 goto FinishedParams; 9412 T = PT->getPointeeType(); 9413 if (!T.isConstQualified()) 9414 goto FinishedParams; 9415 T = T.getUnqualifiedType(); 9416 9417 // Move on to the second parameter; 9418 ++Param; 9419 9420 // If there is no second parameter, the first must be a const char * 9421 if (Param == FnDecl->param_end()) { 9422 if (Context.hasSameType(T, Context.CharTy)) 9423 Valid = true; 9424 goto FinishedParams; 9425 } 9426 9427 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9428 // are allowed as the first parameter to a two-parameter function 9429 if (!(Context.hasSameType(T, Context.CharTy) || 9430 Context.hasSameType(T, Context.WCharTy) || 9431 Context.hasSameType(T, Context.Char16Ty) || 9432 Context.hasSameType(T, Context.Char32Ty))) 9433 goto FinishedParams; 9434 9435 // The second and final parameter must be an std::size_t 9436 T = (*Param)->getType().getUnqualifiedType(); 9437 if (Context.hasSameType(T, Context.getSizeType()) && 9438 ++Param == FnDecl->param_end()) 9439 Valid = true; 9440 } 9441 9442 // FIXME: This diagnostic is absolutely terrible. 9443FinishedParams: 9444 if (!Valid) { 9445 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9446 << FnDecl->getDeclName(); 9447 return true; 9448 } 9449 9450 StringRef LiteralName 9451 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9452 if (LiteralName[0] != '_') { 9453 // C++0x [usrlit.suffix]p1: 9454 // Literal suffix identifiers that do not start with an underscore are 9455 // reserved for future standardization. 9456 bool IsHexFloat = true; 9457 if (LiteralName.size() > 1 && 9458 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9459 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9460 if (!isdigit(LiteralName[I])) { 9461 IsHexFloat = false; 9462 break; 9463 } 9464 } 9465 } 9466 9467 if (IsHexFloat) 9468 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9469 << LiteralName; 9470 else 9471 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9472 } 9473 9474 return false; 9475} 9476 9477/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9478/// linkage specification, including the language and (if present) 9479/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9480/// the location of the language string literal, which is provided 9481/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9482/// the '{' brace. Otherwise, this linkage specification does not 9483/// have any braces. 9484Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9485 SourceLocation LangLoc, 9486 StringRef Lang, 9487 SourceLocation LBraceLoc) { 9488 LinkageSpecDecl::LanguageIDs Language; 9489 if (Lang == "\"C\"") 9490 Language = LinkageSpecDecl::lang_c; 9491 else if (Lang == "\"C++\"") 9492 Language = LinkageSpecDecl::lang_cxx; 9493 else { 9494 Diag(LangLoc, diag::err_bad_language); 9495 return 0; 9496 } 9497 9498 // FIXME: Add all the various semantics of linkage specifications 9499 9500 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9501 ExternLoc, LangLoc, Language); 9502 CurContext->addDecl(D); 9503 PushDeclContext(S, D); 9504 return D; 9505} 9506 9507/// ActOnFinishLinkageSpecification - Complete the definition of 9508/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9509/// valid, it's the position of the closing '}' brace in a linkage 9510/// specification that uses braces. 9511Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9512 Decl *LinkageSpec, 9513 SourceLocation RBraceLoc) { 9514 if (LinkageSpec) { 9515 if (RBraceLoc.isValid()) { 9516 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9517 LSDecl->setRBraceLoc(RBraceLoc); 9518 } 9519 PopDeclContext(); 9520 } 9521 return LinkageSpec; 9522} 9523 9524/// \brief Perform semantic analysis for the variable declaration that 9525/// occurs within a C++ catch clause, returning the newly-created 9526/// variable. 9527VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9528 TypeSourceInfo *TInfo, 9529 SourceLocation StartLoc, 9530 SourceLocation Loc, 9531 IdentifierInfo *Name) { 9532 bool Invalid = false; 9533 QualType ExDeclType = TInfo->getType(); 9534 9535 // Arrays and functions decay. 9536 if (ExDeclType->isArrayType()) 9537 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9538 else if (ExDeclType->isFunctionType()) 9539 ExDeclType = Context.getPointerType(ExDeclType); 9540 9541 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9542 // The exception-declaration shall not denote a pointer or reference to an 9543 // incomplete type, other than [cv] void*. 9544 // N2844 forbids rvalue references. 9545 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9546 Diag(Loc, diag::err_catch_rvalue_ref); 9547 Invalid = true; 9548 } 9549 9550 // GCC allows catching pointers and references to incomplete types 9551 // as an extension; so do we, but we warn by default. 9552 9553 QualType BaseType = ExDeclType; 9554 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9555 unsigned DK = diag::err_catch_incomplete; 9556 bool IncompleteCatchIsInvalid = true; 9557 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9558 BaseType = Ptr->getPointeeType(); 9559 Mode = 1; 9560 DK = diag::ext_catch_incomplete_ptr; 9561 IncompleteCatchIsInvalid = false; 9562 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9563 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9564 BaseType = Ref->getPointeeType(); 9565 Mode = 2; 9566 DK = diag::ext_catch_incomplete_ref; 9567 IncompleteCatchIsInvalid = false; 9568 } 9569 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9570 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9571 IncompleteCatchIsInvalid) 9572 Invalid = true; 9573 9574 if (!Invalid && !ExDeclType->isDependentType() && 9575 RequireNonAbstractType(Loc, ExDeclType, 9576 diag::err_abstract_type_in_decl, 9577 AbstractVariableType)) 9578 Invalid = true; 9579 9580 // Only the non-fragile NeXT runtime currently supports C++ catches 9581 // of ObjC types, and no runtime supports catching ObjC types by value. 9582 if (!Invalid && getLangOptions().ObjC1) { 9583 QualType T = ExDeclType; 9584 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9585 T = RT->getPointeeType(); 9586 9587 if (T->isObjCObjectType()) { 9588 Diag(Loc, diag::err_objc_object_catch); 9589 Invalid = true; 9590 } else if (T->isObjCObjectPointerType()) { 9591 if (!getLangOptions().ObjCNonFragileABI) 9592 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9593 } 9594 } 9595 9596 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9597 ExDeclType, TInfo, SC_None, SC_None); 9598 ExDecl->setExceptionVariable(true); 9599 9600 // In ARC, infer 'retaining' for variables of retainable type. 9601 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9602 Invalid = true; 9603 9604 if (!Invalid && !ExDeclType->isDependentType()) { 9605 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9606 // C++ [except.handle]p16: 9607 // The object declared in an exception-declaration or, if the 9608 // exception-declaration does not specify a name, a temporary (12.2) is 9609 // copy-initialized (8.5) from the exception object. [...] 9610 // The object is destroyed when the handler exits, after the destruction 9611 // of any automatic objects initialized within the handler. 9612 // 9613 // We just pretend to initialize the object with itself, then make sure 9614 // it can be destroyed later. 9615 QualType initType = ExDeclType; 9616 9617 InitializedEntity entity = 9618 InitializedEntity::InitializeVariable(ExDecl); 9619 InitializationKind initKind = 9620 InitializationKind::CreateCopy(Loc, SourceLocation()); 9621 9622 Expr *opaqueValue = 9623 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9624 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9625 ExprResult result = sequence.Perform(*this, entity, initKind, 9626 MultiExprArg(&opaqueValue, 1)); 9627 if (result.isInvalid()) 9628 Invalid = true; 9629 else { 9630 // If the constructor used was non-trivial, set this as the 9631 // "initializer". 9632 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9633 if (!construct->getConstructor()->isTrivial()) { 9634 Expr *init = MaybeCreateExprWithCleanups(construct); 9635 ExDecl->setInit(init); 9636 } 9637 9638 // And make sure it's destructable. 9639 FinalizeVarWithDestructor(ExDecl, recordType); 9640 } 9641 } 9642 } 9643 9644 if (Invalid) 9645 ExDecl->setInvalidDecl(); 9646 9647 return ExDecl; 9648} 9649 9650/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9651/// handler. 9652Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9653 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9654 bool Invalid = D.isInvalidType(); 9655 9656 // Check for unexpanded parameter packs. 9657 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9658 UPPC_ExceptionType)) { 9659 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9660 D.getIdentifierLoc()); 9661 Invalid = true; 9662 } 9663 9664 IdentifierInfo *II = D.getIdentifier(); 9665 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9666 LookupOrdinaryName, 9667 ForRedeclaration)) { 9668 // The scope should be freshly made just for us. There is just no way 9669 // it contains any previous declaration. 9670 assert(!S->isDeclScope(PrevDecl)); 9671 if (PrevDecl->isTemplateParameter()) { 9672 // Maybe we will complain about the shadowed template parameter. 9673 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9674 PrevDecl = 0; 9675 } 9676 } 9677 9678 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9679 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9680 << D.getCXXScopeSpec().getRange(); 9681 Invalid = true; 9682 } 9683 9684 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9685 D.getSourceRange().getBegin(), 9686 D.getIdentifierLoc(), 9687 D.getIdentifier()); 9688 if (Invalid) 9689 ExDecl->setInvalidDecl(); 9690 9691 // Add the exception declaration into this scope. 9692 if (II) 9693 PushOnScopeChains(ExDecl, S); 9694 else 9695 CurContext->addDecl(ExDecl); 9696 9697 ProcessDeclAttributes(S, ExDecl, D); 9698 return ExDecl; 9699} 9700 9701Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9702 Expr *AssertExpr, 9703 Expr *AssertMessageExpr_, 9704 SourceLocation RParenLoc) { 9705 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9706 9707 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9708 llvm::APSInt Cond; 9709 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9710 diag::err_static_assert_expression_is_not_constant, 9711 /*AllowFold=*/false)) 9712 return 0; 9713 9714 if (!Cond) 9715 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9716 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9717 } 9718 9719 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9720 return 0; 9721 9722 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9723 AssertExpr, AssertMessage, RParenLoc); 9724 9725 CurContext->addDecl(Decl); 9726 return Decl; 9727} 9728 9729/// \brief Perform semantic analysis of the given friend type declaration. 9730/// 9731/// \returns A friend declaration that. 9732FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9733 SourceLocation FriendLoc, 9734 TypeSourceInfo *TSInfo) { 9735 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9736 9737 QualType T = TSInfo->getType(); 9738 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9739 9740 // C++03 [class.friend]p2: 9741 // An elaborated-type-specifier shall be used in a friend declaration 9742 // for a class.* 9743 // 9744 // * The class-key of the elaborated-type-specifier is required. 9745 if (!ActiveTemplateInstantiations.empty()) { 9746 // Do not complain about the form of friend template types during 9747 // template instantiation; we will already have complained when the 9748 // template was declared. 9749 } else if (!T->isElaboratedTypeSpecifier()) { 9750 // If we evaluated the type to a record type, suggest putting 9751 // a tag in front. 9752 if (const RecordType *RT = T->getAs<RecordType>()) { 9753 RecordDecl *RD = RT->getDecl(); 9754 9755 std::string InsertionText = std::string(" ") + RD->getKindName(); 9756 9757 Diag(TypeRange.getBegin(), 9758 getLangOptions().CPlusPlus0x ? 9759 diag::warn_cxx98_compat_unelaborated_friend_type : 9760 diag::ext_unelaborated_friend_type) 9761 << (unsigned) RD->getTagKind() 9762 << T 9763 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9764 InsertionText); 9765 } else { 9766 Diag(FriendLoc, 9767 getLangOptions().CPlusPlus0x ? 9768 diag::warn_cxx98_compat_nonclass_type_friend : 9769 diag::ext_nonclass_type_friend) 9770 << T 9771 << SourceRange(FriendLoc, TypeRange.getEnd()); 9772 } 9773 } else if (T->getAs<EnumType>()) { 9774 Diag(FriendLoc, 9775 getLangOptions().CPlusPlus0x ? 9776 diag::warn_cxx98_compat_enum_friend : 9777 diag::ext_enum_friend) 9778 << T 9779 << SourceRange(FriendLoc, TypeRange.getEnd()); 9780 } 9781 9782 // C++0x [class.friend]p3: 9783 // If the type specifier in a friend declaration designates a (possibly 9784 // cv-qualified) class type, that class is declared as a friend; otherwise, 9785 // the friend declaration is ignored. 9786 9787 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9788 // in [class.friend]p3 that we do not implement. 9789 9790 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9791} 9792 9793/// Handle a friend tag declaration where the scope specifier was 9794/// templated. 9795Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9796 unsigned TagSpec, SourceLocation TagLoc, 9797 CXXScopeSpec &SS, 9798 IdentifierInfo *Name, SourceLocation NameLoc, 9799 AttributeList *Attr, 9800 MultiTemplateParamsArg TempParamLists) { 9801 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9802 9803 bool isExplicitSpecialization = false; 9804 bool Invalid = false; 9805 9806 if (TemplateParameterList *TemplateParams 9807 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9808 TempParamLists.get(), 9809 TempParamLists.size(), 9810 /*friend*/ true, 9811 isExplicitSpecialization, 9812 Invalid)) { 9813 if (TemplateParams->size() > 0) { 9814 // This is a declaration of a class template. 9815 if (Invalid) 9816 return 0; 9817 9818 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9819 SS, Name, NameLoc, Attr, 9820 TemplateParams, AS_public, 9821 /*ModulePrivateLoc=*/SourceLocation(), 9822 TempParamLists.size() - 1, 9823 (TemplateParameterList**) TempParamLists.release()).take(); 9824 } else { 9825 // The "template<>" header is extraneous. 9826 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9827 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9828 isExplicitSpecialization = true; 9829 } 9830 } 9831 9832 if (Invalid) return 0; 9833 9834 bool isAllExplicitSpecializations = true; 9835 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9836 if (TempParamLists.get()[I]->size()) { 9837 isAllExplicitSpecializations = false; 9838 break; 9839 } 9840 } 9841 9842 // FIXME: don't ignore attributes. 9843 9844 // If it's explicit specializations all the way down, just forget 9845 // about the template header and build an appropriate non-templated 9846 // friend. TODO: for source fidelity, remember the headers. 9847 if (isAllExplicitSpecializations) { 9848 if (SS.isEmpty()) { 9849 bool Owned = false; 9850 bool IsDependent = false; 9851 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9852 Attr, AS_public, 9853 /*ModulePrivateLoc=*/SourceLocation(), 9854 MultiTemplateParamsArg(), Owned, IsDependent, 9855 /*ScopedEnumKWLoc=*/SourceLocation(), 9856 /*ScopedEnumUsesClassTag=*/false, 9857 /*UnderlyingType=*/TypeResult()); 9858 } 9859 9860 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9861 ElaboratedTypeKeyword Keyword 9862 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9863 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9864 *Name, NameLoc); 9865 if (T.isNull()) 9866 return 0; 9867 9868 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9869 if (isa<DependentNameType>(T)) { 9870 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9871 TL.setKeywordLoc(TagLoc); 9872 TL.setQualifierLoc(QualifierLoc); 9873 TL.setNameLoc(NameLoc); 9874 } else { 9875 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9876 TL.setKeywordLoc(TagLoc); 9877 TL.setQualifierLoc(QualifierLoc); 9878 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9879 } 9880 9881 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9882 TSI, FriendLoc); 9883 Friend->setAccess(AS_public); 9884 CurContext->addDecl(Friend); 9885 return Friend; 9886 } 9887 9888 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9889 9890 9891 9892 // Handle the case of a templated-scope friend class. e.g. 9893 // template <class T> class A<T>::B; 9894 // FIXME: we don't support these right now. 9895 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9896 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9897 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9898 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9899 TL.setKeywordLoc(TagLoc); 9900 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9901 TL.setNameLoc(NameLoc); 9902 9903 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9904 TSI, FriendLoc); 9905 Friend->setAccess(AS_public); 9906 Friend->setUnsupportedFriend(true); 9907 CurContext->addDecl(Friend); 9908 return Friend; 9909} 9910 9911 9912/// Handle a friend type declaration. This works in tandem with 9913/// ActOnTag. 9914/// 9915/// Notes on friend class templates: 9916/// 9917/// We generally treat friend class declarations as if they were 9918/// declaring a class. So, for example, the elaborated type specifier 9919/// in a friend declaration is required to obey the restrictions of a 9920/// class-head (i.e. no typedefs in the scope chain), template 9921/// parameters are required to match up with simple template-ids, &c. 9922/// However, unlike when declaring a template specialization, it's 9923/// okay to refer to a template specialization without an empty 9924/// template parameter declaration, e.g. 9925/// friend class A<T>::B<unsigned>; 9926/// We permit this as a special case; if there are any template 9927/// parameters present at all, require proper matching, i.e. 9928/// template <> template <class T> friend class A<int>::B; 9929Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9930 MultiTemplateParamsArg TempParams) { 9931 SourceLocation Loc = DS.getSourceRange().getBegin(); 9932 9933 assert(DS.isFriendSpecified()); 9934 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9935 9936 // Try to convert the decl specifier to a type. This works for 9937 // friend templates because ActOnTag never produces a ClassTemplateDecl 9938 // for a TUK_Friend. 9939 Declarator TheDeclarator(DS, Declarator::MemberContext); 9940 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9941 QualType T = TSI->getType(); 9942 if (TheDeclarator.isInvalidType()) 9943 return 0; 9944 9945 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9946 return 0; 9947 9948 // This is definitely an error in C++98. It's probably meant to 9949 // be forbidden in C++0x, too, but the specification is just 9950 // poorly written. 9951 // 9952 // The problem is with declarations like the following: 9953 // template <T> friend A<T>::foo; 9954 // where deciding whether a class C is a friend or not now hinges 9955 // on whether there exists an instantiation of A that causes 9956 // 'foo' to equal C. There are restrictions on class-heads 9957 // (which we declare (by fiat) elaborated friend declarations to 9958 // be) that makes this tractable. 9959 // 9960 // FIXME: handle "template <> friend class A<T>;", which 9961 // is possibly well-formed? Who even knows? 9962 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9963 Diag(Loc, diag::err_tagless_friend_type_template) 9964 << DS.getSourceRange(); 9965 return 0; 9966 } 9967 9968 // C++98 [class.friend]p1: A friend of a class is a function 9969 // or class that is not a member of the class . . . 9970 // This is fixed in DR77, which just barely didn't make the C++03 9971 // deadline. It's also a very silly restriction that seriously 9972 // affects inner classes and which nobody else seems to implement; 9973 // thus we never diagnose it, not even in -pedantic. 9974 // 9975 // But note that we could warn about it: it's always useless to 9976 // friend one of your own members (it's not, however, worthless to 9977 // friend a member of an arbitrary specialization of your template). 9978 9979 Decl *D; 9980 if (unsigned NumTempParamLists = TempParams.size()) 9981 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9982 NumTempParamLists, 9983 TempParams.release(), 9984 TSI, 9985 DS.getFriendSpecLoc()); 9986 else 9987 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9988 9989 if (!D) 9990 return 0; 9991 9992 D->setAccess(AS_public); 9993 CurContext->addDecl(D); 9994 9995 return D; 9996} 9997 9998Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9999 MultiTemplateParamsArg TemplateParams) { 10000 const DeclSpec &DS = D.getDeclSpec(); 10001 10002 assert(DS.isFriendSpecified()); 10003 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10004 10005 SourceLocation Loc = D.getIdentifierLoc(); 10006 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10007 10008 // C++ [class.friend]p1 10009 // A friend of a class is a function or class.... 10010 // Note that this sees through typedefs, which is intended. 10011 // It *doesn't* see through dependent types, which is correct 10012 // according to [temp.arg.type]p3: 10013 // If a declaration acquires a function type through a 10014 // type dependent on a template-parameter and this causes 10015 // a declaration that does not use the syntactic form of a 10016 // function declarator to have a function type, the program 10017 // is ill-formed. 10018 if (!TInfo->getType()->isFunctionType()) { 10019 Diag(Loc, diag::err_unexpected_friend); 10020 10021 // It might be worthwhile to try to recover by creating an 10022 // appropriate declaration. 10023 return 0; 10024 } 10025 10026 // C++ [namespace.memdef]p3 10027 // - If a friend declaration in a non-local class first declares a 10028 // class or function, the friend class or function is a member 10029 // of the innermost enclosing namespace. 10030 // - The name of the friend is not found by simple name lookup 10031 // until a matching declaration is provided in that namespace 10032 // scope (either before or after the class declaration granting 10033 // friendship). 10034 // - If a friend function is called, its name may be found by the 10035 // name lookup that considers functions from namespaces and 10036 // classes associated with the types of the function arguments. 10037 // - When looking for a prior declaration of a class or a function 10038 // declared as a friend, scopes outside the innermost enclosing 10039 // namespace scope are not considered. 10040 10041 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10042 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10043 DeclarationName Name = NameInfo.getName(); 10044 assert(Name); 10045 10046 // Check for unexpanded parameter packs. 10047 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10048 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10049 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10050 return 0; 10051 10052 // The context we found the declaration in, or in which we should 10053 // create the declaration. 10054 DeclContext *DC; 10055 Scope *DCScope = S; 10056 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10057 ForRedeclaration); 10058 10059 // FIXME: there are different rules in local classes 10060 10061 // There are four cases here. 10062 // - There's no scope specifier, in which case we just go to the 10063 // appropriate scope and look for a function or function template 10064 // there as appropriate. 10065 // Recover from invalid scope qualifiers as if they just weren't there. 10066 if (SS.isInvalid() || !SS.isSet()) { 10067 // C++0x [namespace.memdef]p3: 10068 // If the name in a friend declaration is neither qualified nor 10069 // a template-id and the declaration is a function or an 10070 // elaborated-type-specifier, the lookup to determine whether 10071 // the entity has been previously declared shall not consider 10072 // any scopes outside the innermost enclosing namespace. 10073 // C++0x [class.friend]p11: 10074 // If a friend declaration appears in a local class and the name 10075 // specified is an unqualified name, a prior declaration is 10076 // looked up without considering scopes that are outside the 10077 // innermost enclosing non-class scope. For a friend function 10078 // declaration, if there is no prior declaration, the program is 10079 // ill-formed. 10080 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10081 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10082 10083 // Find the appropriate context according to the above. 10084 DC = CurContext; 10085 while (true) { 10086 // Skip class contexts. If someone can cite chapter and verse 10087 // for this behavior, that would be nice --- it's what GCC and 10088 // EDG do, and it seems like a reasonable intent, but the spec 10089 // really only says that checks for unqualified existing 10090 // declarations should stop at the nearest enclosing namespace, 10091 // not that they should only consider the nearest enclosing 10092 // namespace. 10093 while (DC->isRecord()) 10094 DC = DC->getParent(); 10095 10096 LookupQualifiedName(Previous, DC); 10097 10098 // TODO: decide what we think about using declarations. 10099 if (isLocal || !Previous.empty()) 10100 break; 10101 10102 if (isTemplateId) { 10103 if (isa<TranslationUnitDecl>(DC)) break; 10104 } else { 10105 if (DC->isFileContext()) break; 10106 } 10107 DC = DC->getParent(); 10108 } 10109 10110 // C++ [class.friend]p1: A friend of a class is a function or 10111 // class that is not a member of the class . . . 10112 // C++11 changes this for both friend types and functions. 10113 // Most C++ 98 compilers do seem to give an error here, so 10114 // we do, too. 10115 if (!Previous.empty() && DC->Equals(CurContext)) 10116 Diag(DS.getFriendSpecLoc(), 10117 getLangOptions().CPlusPlus0x ? 10118 diag::warn_cxx98_compat_friend_is_member : 10119 diag::err_friend_is_member); 10120 10121 DCScope = getScopeForDeclContext(S, DC); 10122 10123 // C++ [class.friend]p6: 10124 // A function can be defined in a friend declaration of a class if and 10125 // only if the class is a non-local class (9.8), the function name is 10126 // unqualified, and the function has namespace scope. 10127 if (isLocal && D.isFunctionDefinition()) { 10128 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10129 } 10130 10131 // - There's a non-dependent scope specifier, in which case we 10132 // compute it and do a previous lookup there for a function 10133 // or function template. 10134 } else if (!SS.getScopeRep()->isDependent()) { 10135 DC = computeDeclContext(SS); 10136 if (!DC) return 0; 10137 10138 if (RequireCompleteDeclContext(SS, DC)) return 0; 10139 10140 LookupQualifiedName(Previous, DC); 10141 10142 // Ignore things found implicitly in the wrong scope. 10143 // TODO: better diagnostics for this case. Suggesting the right 10144 // qualified scope would be nice... 10145 LookupResult::Filter F = Previous.makeFilter(); 10146 while (F.hasNext()) { 10147 NamedDecl *D = F.next(); 10148 if (!DC->InEnclosingNamespaceSetOf( 10149 D->getDeclContext()->getRedeclContext())) 10150 F.erase(); 10151 } 10152 F.done(); 10153 10154 if (Previous.empty()) { 10155 D.setInvalidType(); 10156 Diag(Loc, diag::err_qualified_friend_not_found) 10157 << Name << TInfo->getType(); 10158 return 0; 10159 } 10160 10161 // C++ [class.friend]p1: A friend of a class is a function or 10162 // class that is not a member of the class . . . 10163 if (DC->Equals(CurContext)) 10164 Diag(DS.getFriendSpecLoc(), 10165 getLangOptions().CPlusPlus0x ? 10166 diag::warn_cxx98_compat_friend_is_member : 10167 diag::err_friend_is_member); 10168 10169 if (D.isFunctionDefinition()) { 10170 // C++ [class.friend]p6: 10171 // A function can be defined in a friend declaration of a class if and 10172 // only if the class is a non-local class (9.8), the function name is 10173 // unqualified, and the function has namespace scope. 10174 SemaDiagnosticBuilder DB 10175 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10176 10177 DB << SS.getScopeRep(); 10178 if (DC->isFileContext()) 10179 DB << FixItHint::CreateRemoval(SS.getRange()); 10180 SS.clear(); 10181 } 10182 10183 // - There's a scope specifier that does not match any template 10184 // parameter lists, in which case we use some arbitrary context, 10185 // create a method or method template, and wait for instantiation. 10186 // - There's a scope specifier that does match some template 10187 // parameter lists, which we don't handle right now. 10188 } else { 10189 if (D.isFunctionDefinition()) { 10190 // C++ [class.friend]p6: 10191 // A function can be defined in a friend declaration of a class if and 10192 // only if the class is a non-local class (9.8), the function name is 10193 // unqualified, and the function has namespace scope. 10194 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10195 << SS.getScopeRep(); 10196 } 10197 10198 DC = CurContext; 10199 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10200 } 10201 10202 if (!DC->isRecord()) { 10203 // This implies that it has to be an operator or function. 10204 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10205 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10206 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10207 Diag(Loc, diag::err_introducing_special_friend) << 10208 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10209 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10210 return 0; 10211 } 10212 } 10213 10214 // FIXME: This is an egregious hack to cope with cases where the scope stack 10215 // does not contain the declaration context, i.e., in an out-of-line 10216 // definition of a class. 10217 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10218 if (!DCScope) { 10219 FakeDCScope.setEntity(DC); 10220 DCScope = &FakeDCScope; 10221 } 10222 10223 bool AddToScope = true; 10224 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10225 move(TemplateParams), AddToScope); 10226 if (!ND) return 0; 10227 10228 assert(ND->getDeclContext() == DC); 10229 assert(ND->getLexicalDeclContext() == CurContext); 10230 10231 // Add the function declaration to the appropriate lookup tables, 10232 // adjusting the redeclarations list as necessary. We don't 10233 // want to do this yet if the friending class is dependent. 10234 // 10235 // Also update the scope-based lookup if the target context's 10236 // lookup context is in lexical scope. 10237 if (!CurContext->isDependentContext()) { 10238 DC = DC->getRedeclContext(); 10239 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10240 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10241 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10242 } 10243 10244 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10245 D.getIdentifierLoc(), ND, 10246 DS.getFriendSpecLoc()); 10247 FrD->setAccess(AS_public); 10248 CurContext->addDecl(FrD); 10249 10250 if (ND->isInvalidDecl()) 10251 FrD->setInvalidDecl(); 10252 else { 10253 FunctionDecl *FD; 10254 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10255 FD = FTD->getTemplatedDecl(); 10256 else 10257 FD = cast<FunctionDecl>(ND); 10258 10259 // Mark templated-scope function declarations as unsupported. 10260 if (FD->getNumTemplateParameterLists()) 10261 FrD->setUnsupportedFriend(true); 10262 } 10263 10264 return ND; 10265} 10266 10267void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10268 AdjustDeclIfTemplate(Dcl); 10269 10270 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10271 if (!Fn) { 10272 Diag(DelLoc, diag::err_deleted_non_function); 10273 return; 10274 } 10275 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10276 Diag(DelLoc, diag::err_deleted_decl_not_first); 10277 Diag(Prev->getLocation(), diag::note_previous_declaration); 10278 // If the declaration wasn't the first, we delete the function anyway for 10279 // recovery. 10280 } 10281 Fn->setDeletedAsWritten(); 10282} 10283 10284void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10285 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10286 10287 if (MD) { 10288 if (MD->getParent()->isDependentType()) { 10289 MD->setDefaulted(); 10290 MD->setExplicitlyDefaulted(); 10291 return; 10292 } 10293 10294 CXXSpecialMember Member = getSpecialMember(MD); 10295 if (Member == CXXInvalid) { 10296 Diag(DefaultLoc, diag::err_default_special_members); 10297 return; 10298 } 10299 10300 MD->setDefaulted(); 10301 MD->setExplicitlyDefaulted(); 10302 10303 // If this definition appears within the record, do the checking when 10304 // the record is complete. 10305 const FunctionDecl *Primary = MD; 10306 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10307 // Find the uninstantiated declaration that actually had the '= default' 10308 // on it. 10309 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10310 10311 if (Primary == Primary->getCanonicalDecl()) 10312 return; 10313 10314 switch (Member) { 10315 case CXXDefaultConstructor: { 10316 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10317 CheckExplicitlyDefaultedDefaultConstructor(CD); 10318 if (!CD->isInvalidDecl()) 10319 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10320 break; 10321 } 10322 10323 case CXXCopyConstructor: { 10324 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10325 CheckExplicitlyDefaultedCopyConstructor(CD); 10326 if (!CD->isInvalidDecl()) 10327 DefineImplicitCopyConstructor(DefaultLoc, CD); 10328 break; 10329 } 10330 10331 case CXXCopyAssignment: { 10332 CheckExplicitlyDefaultedCopyAssignment(MD); 10333 if (!MD->isInvalidDecl()) 10334 DefineImplicitCopyAssignment(DefaultLoc, MD); 10335 break; 10336 } 10337 10338 case CXXDestructor: { 10339 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10340 CheckExplicitlyDefaultedDestructor(DD); 10341 if (!DD->isInvalidDecl()) 10342 DefineImplicitDestructor(DefaultLoc, DD); 10343 break; 10344 } 10345 10346 case CXXMoveConstructor: { 10347 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10348 CheckExplicitlyDefaultedMoveConstructor(CD); 10349 if (!CD->isInvalidDecl()) 10350 DefineImplicitMoveConstructor(DefaultLoc, CD); 10351 break; 10352 } 10353 10354 case CXXMoveAssignment: { 10355 CheckExplicitlyDefaultedMoveAssignment(MD); 10356 if (!MD->isInvalidDecl()) 10357 DefineImplicitMoveAssignment(DefaultLoc, MD); 10358 break; 10359 } 10360 10361 case CXXInvalid: 10362 llvm_unreachable("Invalid special member."); 10363 } 10364 } else { 10365 Diag(DefaultLoc, diag::err_default_special_members); 10366 } 10367} 10368 10369static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10370 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10371 Stmt *SubStmt = *CI; 10372 if (!SubStmt) 10373 continue; 10374 if (isa<ReturnStmt>(SubStmt)) 10375 Self.Diag(SubStmt->getSourceRange().getBegin(), 10376 diag::err_return_in_constructor_handler); 10377 if (!isa<Expr>(SubStmt)) 10378 SearchForReturnInStmt(Self, SubStmt); 10379 } 10380} 10381 10382void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10383 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10384 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10385 SearchForReturnInStmt(*this, Handler); 10386 } 10387} 10388 10389bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10390 const CXXMethodDecl *Old) { 10391 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10392 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10393 10394 if (Context.hasSameType(NewTy, OldTy) || 10395 NewTy->isDependentType() || OldTy->isDependentType()) 10396 return false; 10397 10398 // Check if the return types are covariant 10399 QualType NewClassTy, OldClassTy; 10400 10401 /// Both types must be pointers or references to classes. 10402 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10403 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10404 NewClassTy = NewPT->getPointeeType(); 10405 OldClassTy = OldPT->getPointeeType(); 10406 } 10407 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10408 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10409 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10410 NewClassTy = NewRT->getPointeeType(); 10411 OldClassTy = OldRT->getPointeeType(); 10412 } 10413 } 10414 } 10415 10416 // The return types aren't either both pointers or references to a class type. 10417 if (NewClassTy.isNull()) { 10418 Diag(New->getLocation(), 10419 diag::err_different_return_type_for_overriding_virtual_function) 10420 << New->getDeclName() << NewTy << OldTy; 10421 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10422 10423 return true; 10424 } 10425 10426 // C++ [class.virtual]p6: 10427 // If the return type of D::f differs from the return type of B::f, the 10428 // class type in the return type of D::f shall be complete at the point of 10429 // declaration of D::f or shall be the class type D. 10430 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10431 if (!RT->isBeingDefined() && 10432 RequireCompleteType(New->getLocation(), NewClassTy, 10433 PDiag(diag::err_covariant_return_incomplete) 10434 << New->getDeclName())) 10435 return true; 10436 } 10437 10438 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10439 // Check if the new class derives from the old class. 10440 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10441 Diag(New->getLocation(), 10442 diag::err_covariant_return_not_derived) 10443 << New->getDeclName() << NewTy << OldTy; 10444 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10445 return true; 10446 } 10447 10448 // Check if we the conversion from derived to base is valid. 10449 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10450 diag::err_covariant_return_inaccessible_base, 10451 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10452 // FIXME: Should this point to the return type? 10453 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10454 // FIXME: this note won't trigger for delayed access control 10455 // diagnostics, and it's impossible to get an undelayed error 10456 // here from access control during the original parse because 10457 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10458 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10459 return true; 10460 } 10461 } 10462 10463 // The qualifiers of the return types must be the same. 10464 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10465 Diag(New->getLocation(), 10466 diag::err_covariant_return_type_different_qualifications) 10467 << New->getDeclName() << NewTy << OldTy; 10468 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10469 return true; 10470 }; 10471 10472 10473 // The new class type must have the same or less qualifiers as the old type. 10474 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10475 Diag(New->getLocation(), 10476 diag::err_covariant_return_type_class_type_more_qualified) 10477 << New->getDeclName() << NewTy << OldTy; 10478 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10479 return true; 10480 }; 10481 10482 return false; 10483} 10484 10485/// \brief Mark the given method pure. 10486/// 10487/// \param Method the method to be marked pure. 10488/// 10489/// \param InitRange the source range that covers the "0" initializer. 10490bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10491 SourceLocation EndLoc = InitRange.getEnd(); 10492 if (EndLoc.isValid()) 10493 Method->setRangeEnd(EndLoc); 10494 10495 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10496 Method->setPure(); 10497 return false; 10498 } 10499 10500 if (!Method->isInvalidDecl()) 10501 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10502 << Method->getDeclName() << InitRange; 10503 return true; 10504} 10505 10506/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10507/// an initializer for the out-of-line declaration 'Dcl'. The scope 10508/// is a fresh scope pushed for just this purpose. 10509/// 10510/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10511/// static data member of class X, names should be looked up in the scope of 10512/// class X. 10513void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10514 // If there is no declaration, there was an error parsing it. 10515 if (D == 0 || D->isInvalidDecl()) return; 10516 10517 // We should only get called for declarations with scope specifiers, like: 10518 // int foo::bar; 10519 assert(D->isOutOfLine()); 10520 EnterDeclaratorContext(S, D->getDeclContext()); 10521} 10522 10523/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10524/// initializer for the out-of-line declaration 'D'. 10525void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10526 // If there is no declaration, there was an error parsing it. 10527 if (D == 0 || D->isInvalidDecl()) return; 10528 10529 assert(D->isOutOfLine()); 10530 ExitDeclaratorContext(S); 10531} 10532 10533/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10534/// C++ if/switch/while/for statement. 10535/// e.g: "if (int x = f()) {...}" 10536DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10537 // C++ 6.4p2: 10538 // The declarator shall not specify a function or an array. 10539 // The type-specifier-seq shall not contain typedef and shall not declare a 10540 // new class or enumeration. 10541 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10542 "Parser allowed 'typedef' as storage class of condition decl."); 10543 10544 Decl *Dcl = ActOnDeclarator(S, D); 10545 if (!Dcl) 10546 return true; 10547 10548 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10549 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10550 << D.getSourceRange(); 10551 return true; 10552 } 10553 10554 return Dcl; 10555} 10556 10557void Sema::LoadExternalVTableUses() { 10558 if (!ExternalSource) 10559 return; 10560 10561 SmallVector<ExternalVTableUse, 4> VTables; 10562 ExternalSource->ReadUsedVTables(VTables); 10563 SmallVector<VTableUse, 4> NewUses; 10564 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10565 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10566 = VTablesUsed.find(VTables[I].Record); 10567 // Even if a definition wasn't required before, it may be required now. 10568 if (Pos != VTablesUsed.end()) { 10569 if (!Pos->second && VTables[I].DefinitionRequired) 10570 Pos->second = true; 10571 continue; 10572 } 10573 10574 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10575 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10576 } 10577 10578 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10579} 10580 10581void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10582 bool DefinitionRequired) { 10583 // Ignore any vtable uses in unevaluated operands or for classes that do 10584 // not have a vtable. 10585 if (!Class->isDynamicClass() || Class->isDependentContext() || 10586 CurContext->isDependentContext() || 10587 ExprEvalContexts.back().Context == Unevaluated || 10588 ExprEvalContexts.back().Context == ConstantEvaluated) 10589 return; 10590 10591 // Try to insert this class into the map. 10592 LoadExternalVTableUses(); 10593 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10594 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10595 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10596 if (!Pos.second) { 10597 // If we already had an entry, check to see if we are promoting this vtable 10598 // to required a definition. If so, we need to reappend to the VTableUses 10599 // list, since we may have already processed the first entry. 10600 if (DefinitionRequired && !Pos.first->second) { 10601 Pos.first->second = true; 10602 } else { 10603 // Otherwise, we can early exit. 10604 return; 10605 } 10606 } 10607 10608 // Local classes need to have their virtual members marked 10609 // immediately. For all other classes, we mark their virtual members 10610 // at the end of the translation unit. 10611 if (Class->isLocalClass()) 10612 MarkVirtualMembersReferenced(Loc, Class); 10613 else 10614 VTableUses.push_back(std::make_pair(Class, Loc)); 10615} 10616 10617bool Sema::DefineUsedVTables() { 10618 LoadExternalVTableUses(); 10619 if (VTableUses.empty()) 10620 return false; 10621 10622 // Note: The VTableUses vector could grow as a result of marking 10623 // the members of a class as "used", so we check the size each 10624 // time through the loop and prefer indices (with are stable) to 10625 // iterators (which are not). 10626 bool DefinedAnything = false; 10627 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10628 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10629 if (!Class) 10630 continue; 10631 10632 SourceLocation Loc = VTableUses[I].second; 10633 10634 // If this class has a key function, but that key function is 10635 // defined in another translation unit, we don't need to emit the 10636 // vtable even though we're using it. 10637 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10638 if (KeyFunction && !KeyFunction->hasBody()) { 10639 switch (KeyFunction->getTemplateSpecializationKind()) { 10640 case TSK_Undeclared: 10641 case TSK_ExplicitSpecialization: 10642 case TSK_ExplicitInstantiationDeclaration: 10643 // The key function is in another translation unit. 10644 continue; 10645 10646 case TSK_ExplicitInstantiationDefinition: 10647 case TSK_ImplicitInstantiation: 10648 // We will be instantiating the key function. 10649 break; 10650 } 10651 } else if (!KeyFunction) { 10652 // If we have a class with no key function that is the subject 10653 // of an explicit instantiation declaration, suppress the 10654 // vtable; it will live with the explicit instantiation 10655 // definition. 10656 bool IsExplicitInstantiationDeclaration 10657 = Class->getTemplateSpecializationKind() 10658 == TSK_ExplicitInstantiationDeclaration; 10659 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10660 REnd = Class->redecls_end(); 10661 R != REnd; ++R) { 10662 TemplateSpecializationKind TSK 10663 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10664 if (TSK == TSK_ExplicitInstantiationDeclaration) 10665 IsExplicitInstantiationDeclaration = true; 10666 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10667 IsExplicitInstantiationDeclaration = false; 10668 break; 10669 } 10670 } 10671 10672 if (IsExplicitInstantiationDeclaration) 10673 continue; 10674 } 10675 10676 // Mark all of the virtual members of this class as referenced, so 10677 // that we can build a vtable. Then, tell the AST consumer that a 10678 // vtable for this class is required. 10679 DefinedAnything = true; 10680 MarkVirtualMembersReferenced(Loc, Class); 10681 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10682 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10683 10684 // Optionally warn if we're emitting a weak vtable. 10685 if (Class->getLinkage() == ExternalLinkage && 10686 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10687 const FunctionDecl *KeyFunctionDef = 0; 10688 if (!KeyFunction || 10689 (KeyFunction->hasBody(KeyFunctionDef) && 10690 KeyFunctionDef->isInlined())) 10691 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10692 TSK_ExplicitInstantiationDefinition 10693 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10694 << Class; 10695 } 10696 } 10697 VTableUses.clear(); 10698 10699 return DefinedAnything; 10700} 10701 10702void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10703 const CXXRecordDecl *RD) { 10704 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10705 e = RD->method_end(); i != e; ++i) { 10706 CXXMethodDecl *MD = *i; 10707 10708 // C++ [basic.def.odr]p2: 10709 // [...] A virtual member function is used if it is not pure. [...] 10710 if (MD->isVirtual() && !MD->isPure()) 10711 MarkDeclarationReferenced(Loc, MD); 10712 } 10713 10714 // Only classes that have virtual bases need a VTT. 10715 if (RD->getNumVBases() == 0) 10716 return; 10717 10718 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10719 e = RD->bases_end(); i != e; ++i) { 10720 const CXXRecordDecl *Base = 10721 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10722 if (Base->getNumVBases() == 0) 10723 continue; 10724 MarkVirtualMembersReferenced(Loc, Base); 10725 } 10726} 10727 10728/// SetIvarInitializers - This routine builds initialization ASTs for the 10729/// Objective-C implementation whose ivars need be initialized. 10730void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10731 if (!getLangOptions().CPlusPlus) 10732 return; 10733 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10734 SmallVector<ObjCIvarDecl*, 8> ivars; 10735 CollectIvarsToConstructOrDestruct(OID, ivars); 10736 if (ivars.empty()) 10737 return; 10738 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10739 for (unsigned i = 0; i < ivars.size(); i++) { 10740 FieldDecl *Field = ivars[i]; 10741 if (Field->isInvalidDecl()) 10742 continue; 10743 10744 CXXCtorInitializer *Member; 10745 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10746 InitializationKind InitKind = 10747 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10748 10749 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10750 ExprResult MemberInit = 10751 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10752 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10753 // Note, MemberInit could actually come back empty if no initialization 10754 // is required (e.g., because it would call a trivial default constructor) 10755 if (!MemberInit.get() || MemberInit.isInvalid()) 10756 continue; 10757 10758 Member = 10759 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10760 SourceLocation(), 10761 MemberInit.takeAs<Expr>(), 10762 SourceLocation()); 10763 AllToInit.push_back(Member); 10764 10765 // Be sure that the destructor is accessible and is marked as referenced. 10766 if (const RecordType *RecordTy 10767 = Context.getBaseElementType(Field->getType()) 10768 ->getAs<RecordType>()) { 10769 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10770 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10771 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10772 CheckDestructorAccess(Field->getLocation(), Destructor, 10773 PDiag(diag::err_access_dtor_ivar) 10774 << Context.getBaseElementType(Field->getType())); 10775 } 10776 } 10777 } 10778 ObjCImplementation->setIvarInitializers(Context, 10779 AllToInit.data(), AllToInit.size()); 10780 } 10781} 10782 10783static 10784void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10785 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10786 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10787 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10788 Sema &S) { 10789 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10790 CE = Current.end(); 10791 if (Ctor->isInvalidDecl()) 10792 return; 10793 10794 const FunctionDecl *FNTarget = 0; 10795 CXXConstructorDecl *Target; 10796 10797 // We ignore the result here since if we don't have a body, Target will be 10798 // null below. 10799 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10800 Target 10801= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10802 10803 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10804 // Avoid dereferencing a null pointer here. 10805 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10806 10807 if (!Current.insert(Canonical)) 10808 return; 10809 10810 // We know that beyond here, we aren't chaining into a cycle. 10811 if (!Target || !Target->isDelegatingConstructor() || 10812 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10813 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10814 Valid.insert(*CI); 10815 Current.clear(); 10816 // We've hit a cycle. 10817 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10818 Current.count(TCanonical)) { 10819 // If we haven't diagnosed this cycle yet, do so now. 10820 if (!Invalid.count(TCanonical)) { 10821 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10822 diag::warn_delegating_ctor_cycle) 10823 << Ctor; 10824 10825 // Don't add a note for a function delegating directo to itself. 10826 if (TCanonical != Canonical) 10827 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10828 10829 CXXConstructorDecl *C = Target; 10830 while (C->getCanonicalDecl() != Canonical) { 10831 (void)C->getTargetConstructor()->hasBody(FNTarget); 10832 assert(FNTarget && "Ctor cycle through bodiless function"); 10833 10834 C 10835 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10836 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10837 } 10838 } 10839 10840 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10841 Invalid.insert(*CI); 10842 Current.clear(); 10843 } else { 10844 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10845 } 10846} 10847 10848 10849void Sema::CheckDelegatingCtorCycles() { 10850 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10851 10852 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10853 CE = Current.end(); 10854 10855 for (DelegatingCtorDeclsType::iterator 10856 I = DelegatingCtorDecls.begin(ExternalSource), 10857 E = DelegatingCtorDecls.end(); 10858 I != E; ++I) { 10859 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10860 } 10861 10862 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10863 (*CI)->setInvalidDecl(); 10864} 10865 10866/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10867Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10868 // Implicitly declared functions (e.g. copy constructors) are 10869 // __host__ __device__ 10870 if (D->isImplicit()) 10871 return CFT_HostDevice; 10872 10873 if (D->hasAttr<CUDAGlobalAttr>()) 10874 return CFT_Global; 10875 10876 if (D->hasAttr<CUDADeviceAttr>()) { 10877 if (D->hasAttr<CUDAHostAttr>()) 10878 return CFT_HostDevice; 10879 else 10880 return CFT_Device; 10881 } 10882 10883 return CFT_Host; 10884} 10885 10886bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10887 CUDAFunctionTarget CalleeTarget) { 10888 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10889 // Callable from the device only." 10890 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10891 return true; 10892 10893 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10894 // Callable from the host only." 10895 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10896 // Callable from the host only." 10897 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10898 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10899 return true; 10900 10901 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10902 return true; 10903 10904 return false; 10905} 10906