SemaDeclCXX.cpp revision 6fe2965ce722826ae7c3af85271f900286ef20c3
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 SourceLocation IdLoc, 1724 Expr *InitList, 1725 SourceLocation EllipsisLoc) { 1726 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1727 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1728} 1729 1730/// \brief Handle a C++ member initializer using parentheses syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 SourceLocation IdLoc, 1738 SourceLocation LParenLoc, 1739 Expr **Args, unsigned NumArgs, 1740 SourceLocation RParenLoc, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1744 RParenLoc), 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer. 1749MemInitResult 1750Sema::BuildMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 SourceLocation IdLoc, 1756 const MultiInitializer &Args, 1757 SourceLocation EllipsisLoc) { 1758 if (!ConstructorD) 1759 return true; 1760 1761 AdjustDeclIfTemplate(ConstructorD); 1762 1763 CXXConstructorDecl *Constructor 1764 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1765 if (!Constructor) { 1766 // The user wrote a constructor initializer on a function that is 1767 // not a C++ constructor. Ignore the error for now, because we may 1768 // have more member initializers coming; we'll diagnose it just 1769 // once in ActOnMemInitializers. 1770 return true; 1771 } 1772 1773 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1774 1775 // C++ [class.base.init]p2: 1776 // Names in a mem-initializer-id are looked up in the scope of the 1777 // constructor's class and, if not found in that scope, are looked 1778 // up in the scope containing the constructor's definition. 1779 // [Note: if the constructor's class contains a member with the 1780 // same name as a direct or virtual base class of the class, a 1781 // mem-initializer-id naming the member or base class and composed 1782 // of a single identifier refers to the class member. A 1783 // mem-initializer-id for the hidden base class may be specified 1784 // using a qualified name. ] 1785 if (!SS.getScopeRep() && !TemplateTypeTy) { 1786 // Look for a member, first. 1787 DeclContext::lookup_result Result 1788 = ClassDecl->lookup(MemberOrBase); 1789 if (Result.first != Result.second) { 1790 ValueDecl *Member; 1791 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1792 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1793 if (EllipsisLoc.isValid()) 1794 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1795 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1796 1797 return BuildMemberInitializer(Member, Args, IdLoc); 1798 } 1799 } 1800 } 1801 // It didn't name a member, so see if it names a class. 1802 QualType BaseType; 1803 TypeSourceInfo *TInfo = 0; 1804 1805 if (TemplateTypeTy) { 1806 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1807 } else { 1808 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1809 LookupParsedName(R, S, &SS); 1810 1811 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1812 if (!TyD) { 1813 if (R.isAmbiguous()) return true; 1814 1815 // We don't want access-control diagnostics here. 1816 R.suppressDiagnostics(); 1817 1818 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1819 bool NotUnknownSpecialization = false; 1820 DeclContext *DC = computeDeclContext(SS, false); 1821 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1822 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1823 1824 if (!NotUnknownSpecialization) { 1825 // When the scope specifier can refer to a member of an unknown 1826 // specialization, we take it as a type name. 1827 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1828 SS.getWithLocInContext(Context), 1829 *MemberOrBase, IdLoc); 1830 if (BaseType.isNull()) 1831 return true; 1832 1833 R.clear(); 1834 R.setLookupName(MemberOrBase); 1835 } 1836 } 1837 1838 // If no results were found, try to correct typos. 1839 TypoCorrection Corr; 1840 if (R.empty() && BaseType.isNull() && 1841 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1842 ClassDecl, false, CTC_NoKeywords))) { 1843 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1844 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1845 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1846 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1847 // We have found a non-static data member with a similar 1848 // name to what was typed; complain and initialize that 1849 // member. 1850 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1851 << MemberOrBase << true << CorrectedQuotedStr 1852 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1853 Diag(Member->getLocation(), diag::note_previous_decl) 1854 << CorrectedQuotedStr; 1855 1856 return BuildMemberInitializer(Member, Args, IdLoc); 1857 } 1858 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1859 const CXXBaseSpecifier *DirectBaseSpec; 1860 const CXXBaseSpecifier *VirtualBaseSpec; 1861 if (FindBaseInitializer(*this, ClassDecl, 1862 Context.getTypeDeclType(Type), 1863 DirectBaseSpec, VirtualBaseSpec)) { 1864 // We have found a direct or virtual base class with a 1865 // similar name to what was typed; complain and initialize 1866 // that base class. 1867 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1868 << MemberOrBase << false << CorrectedQuotedStr 1869 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1870 1871 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1872 : VirtualBaseSpec; 1873 Diag(BaseSpec->getSourceRange().getBegin(), 1874 diag::note_base_class_specified_here) 1875 << BaseSpec->getType() 1876 << BaseSpec->getSourceRange(); 1877 1878 TyD = Type; 1879 } 1880 } 1881 } 1882 1883 if (!TyD && BaseType.isNull()) { 1884 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1885 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1886 return true; 1887 } 1888 } 1889 1890 if (BaseType.isNull()) { 1891 BaseType = Context.getTypeDeclType(TyD); 1892 if (SS.isSet()) { 1893 NestedNameSpecifier *Qualifier = 1894 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1895 1896 // FIXME: preserve source range information 1897 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1898 } 1899 } 1900 } 1901 1902 if (!TInfo) 1903 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1904 1905 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1906} 1907 1908/// Checks a member initializer expression for cases where reference (or 1909/// pointer) members are bound to by-value parameters (or their addresses). 1910static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1911 Expr *Init, 1912 SourceLocation IdLoc) { 1913 QualType MemberTy = Member->getType(); 1914 1915 // We only handle pointers and references currently. 1916 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1917 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1918 return; 1919 1920 const bool IsPointer = MemberTy->isPointerType(); 1921 if (IsPointer) { 1922 if (const UnaryOperator *Op 1923 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1924 // The only case we're worried about with pointers requires taking the 1925 // address. 1926 if (Op->getOpcode() != UO_AddrOf) 1927 return; 1928 1929 Init = Op->getSubExpr(); 1930 } else { 1931 // We only handle address-of expression initializers for pointers. 1932 return; 1933 } 1934 } 1935 1936 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1937 // Taking the address of a temporary will be diagnosed as a hard error. 1938 if (IsPointer) 1939 return; 1940 1941 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1942 << Member << Init->getSourceRange(); 1943 } else if (const DeclRefExpr *DRE 1944 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1945 // We only warn when referring to a non-reference parameter declaration. 1946 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1947 if (!Parameter || Parameter->getType()->isReferenceType()) 1948 return; 1949 1950 S.Diag(Init->getExprLoc(), 1951 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1952 : diag::warn_bind_ref_member_to_parameter) 1953 << Member << Parameter << Init->getSourceRange(); 1954 } else { 1955 // Other initializers are fine. 1956 return; 1957 } 1958 1959 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1960 << (unsigned)IsPointer; 1961} 1962 1963/// Checks an initializer expression for use of uninitialized fields, such as 1964/// containing the field that is being initialized. Returns true if there is an 1965/// uninitialized field was used an updates the SourceLocation parameter; false 1966/// otherwise. 1967static bool InitExprContainsUninitializedFields(const Stmt *S, 1968 const ValueDecl *LhsField, 1969 SourceLocation *L) { 1970 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1971 1972 if (isa<CallExpr>(S)) { 1973 // Do not descend into function calls or constructors, as the use 1974 // of an uninitialized field may be valid. One would have to inspect 1975 // the contents of the function/ctor to determine if it is safe or not. 1976 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1977 // may be safe, depending on what the function/ctor does. 1978 return false; 1979 } 1980 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1981 const NamedDecl *RhsField = ME->getMemberDecl(); 1982 1983 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1984 // The member expression points to a static data member. 1985 assert(VD->isStaticDataMember() && 1986 "Member points to non-static data member!"); 1987 (void)VD; 1988 return false; 1989 } 1990 1991 if (isa<EnumConstantDecl>(RhsField)) { 1992 // The member expression points to an enum. 1993 return false; 1994 } 1995 1996 if (RhsField == LhsField) { 1997 // Initializing a field with itself. Throw a warning. 1998 // But wait; there are exceptions! 1999 // Exception #1: The field may not belong to this record. 2000 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2001 const Expr *base = ME->getBase(); 2002 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2003 // Even though the field matches, it does not belong to this record. 2004 return false; 2005 } 2006 // None of the exceptions triggered; return true to indicate an 2007 // uninitialized field was used. 2008 *L = ME->getMemberLoc(); 2009 return true; 2010 } 2011 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2012 // sizeof/alignof doesn't reference contents, do not warn. 2013 return false; 2014 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2015 // address-of doesn't reference contents (the pointer may be dereferenced 2016 // in the same expression but it would be rare; and weird). 2017 if (UOE->getOpcode() == UO_AddrOf) 2018 return false; 2019 } 2020 for (Stmt::const_child_range it = S->children(); it; ++it) { 2021 if (!*it) { 2022 // An expression such as 'member(arg ?: "")' may trigger this. 2023 continue; 2024 } 2025 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2026 return true; 2027 } 2028 return false; 2029} 2030 2031MemInitResult 2032Sema::BuildMemberInitializer(ValueDecl *Member, 2033 const MultiInitializer &Args, 2034 SourceLocation IdLoc) { 2035 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2036 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2037 assert((DirectMember || IndirectMember) && 2038 "Member must be a FieldDecl or IndirectFieldDecl"); 2039 2040 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2041 return true; 2042 2043 if (Member->isInvalidDecl()) 2044 return true; 2045 2046 // Diagnose value-uses of fields to initialize themselves, e.g. 2047 // foo(foo) 2048 // where foo is not also a parameter to the constructor. 2049 // TODO: implement -Wuninitialized and fold this into that framework. 2050 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2051 I != E; ++I) { 2052 SourceLocation L; 2053 Expr *Arg = *I; 2054 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2055 Arg = DIE->getInit(); 2056 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2057 // FIXME: Return true in the case when other fields are used before being 2058 // uninitialized. For example, let this field be the i'th field. When 2059 // initializing the i'th field, throw a warning if any of the >= i'th 2060 // fields are used, as they are not yet initialized. 2061 // Right now we are only handling the case where the i'th field uses 2062 // itself in its initializer. 2063 Diag(L, diag::warn_field_is_uninit); 2064 } 2065 } 2066 2067 bool HasDependentArg = Args.isTypeDependent(); 2068 2069 Expr *Init; 2070 if (Member->getType()->isDependentType() || HasDependentArg) { 2071 // Can't check initialization for a member of dependent type or when 2072 // any of the arguments are type-dependent expressions. 2073 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2074 2075 DiscardCleanupsInEvaluationContext(); 2076 } else { 2077 // Initialize the member. 2078 InitializedEntity MemberEntity = 2079 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2080 : InitializedEntity::InitializeMember(IndirectMember, 0); 2081 InitializationKind Kind = 2082 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2083 Args.getEndLoc()); 2084 2085 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2086 if (MemberInit.isInvalid()) 2087 return true; 2088 2089 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2090 2091 // C++0x [class.base.init]p7: 2092 // The initialization of each base and member constitutes a 2093 // full-expression. 2094 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2095 if (MemberInit.isInvalid()) 2096 return true; 2097 2098 // If we are in a dependent context, template instantiation will 2099 // perform this type-checking again. Just save the arguments that we 2100 // received in a ParenListExpr. 2101 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2102 // of the information that we have about the member 2103 // initializer. However, deconstructing the ASTs is a dicey process, 2104 // and this approach is far more likely to get the corner cases right. 2105 if (CurContext->isDependentContext()) { 2106 Init = Args.CreateInitExpr(Context, 2107 Member->getType().getNonReferenceType()); 2108 } else { 2109 Init = MemberInit.get(); 2110 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2111 } 2112 } 2113 2114 if (DirectMember) { 2115 return new (Context) CXXCtorInitializer(Context, DirectMember, 2116 IdLoc, Args.getStartLoc(), 2117 Init, Args.getEndLoc()); 2118 } else { 2119 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2120 IdLoc, Args.getStartLoc(), 2121 Init, Args.getEndLoc()); 2122 } 2123} 2124 2125MemInitResult 2126Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2127 const MultiInitializer &Args, 2128 CXXRecordDecl *ClassDecl) { 2129 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2130 if (!LangOpts.CPlusPlus0x) 2131 return Diag(NameLoc, diag::err_delegating_ctor) 2132 << TInfo->getTypeLoc().getLocalSourceRange(); 2133 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2134 2135 // Initialize the object. 2136 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2137 QualType(ClassDecl->getTypeForDecl(), 0)); 2138 InitializationKind Kind = 2139 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2140 Args.getEndLoc()); 2141 2142 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2143 if (DelegationInit.isInvalid()) 2144 return true; 2145 2146 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2147 "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2159 DelegationInit.takeAs<Expr>(), 2160 Args.getEndLoc()); 2161} 2162 2163MemInitResult 2164Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2165 const MultiInitializer &Args, 2166 CXXRecordDecl *ClassDecl, 2167 SourceLocation EllipsisLoc) { 2168 bool HasDependentArg = Args.isTypeDependent(); 2169 2170 SourceLocation BaseLoc 2171 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2172 2173 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2174 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2175 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2176 2177 // C++ [class.base.init]p2: 2178 // [...] Unless the mem-initializer-id names a nonstatic data 2179 // member of the constructor's class or a direct or virtual base 2180 // of that class, the mem-initializer is ill-formed. A 2181 // mem-initializer-list can initialize a base class using any 2182 // name that denotes that base class type. 2183 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2184 2185 if (EllipsisLoc.isValid()) { 2186 // This is a pack expansion. 2187 if (!BaseType->containsUnexpandedParameterPack()) { 2188 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2189 << SourceRange(BaseLoc, Args.getEndLoc()); 2190 2191 EllipsisLoc = SourceLocation(); 2192 } 2193 } else { 2194 // Check for any unexpanded parameter packs. 2195 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2196 return true; 2197 2198 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2199 return true; 2200 } 2201 2202 // Check for direct and virtual base classes. 2203 const CXXBaseSpecifier *DirectBaseSpec = 0; 2204 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2205 if (!Dependent) { 2206 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2207 BaseType)) 2208 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2209 2210 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2211 VirtualBaseSpec); 2212 2213 // C++ [base.class.init]p2: 2214 // Unless the mem-initializer-id names a nonstatic data member of the 2215 // constructor's class or a direct or virtual base of that class, the 2216 // mem-initializer is ill-formed. 2217 if (!DirectBaseSpec && !VirtualBaseSpec) { 2218 // If the class has any dependent bases, then it's possible that 2219 // one of those types will resolve to the same type as 2220 // BaseType. Therefore, just treat this as a dependent base 2221 // class initialization. FIXME: Should we try to check the 2222 // initialization anyway? It seems odd. 2223 if (ClassDecl->hasAnyDependentBases()) 2224 Dependent = true; 2225 else 2226 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2227 << BaseType << Context.getTypeDeclType(ClassDecl) 2228 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 } 2230 } 2231 2232 if (Dependent) { 2233 // Can't check initialization for a base of dependent type or when 2234 // any of the arguments are type-dependent expressions. 2235 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2236 2237 DiscardCleanupsInEvaluationContext(); 2238 2239 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2240 /*IsVirtual=*/false, 2241 Args.getStartLoc(), BaseInit, 2242 Args.getEndLoc(), EllipsisLoc); 2243 } 2244 2245 // C++ [base.class.init]p2: 2246 // If a mem-initializer-id is ambiguous because it designates both 2247 // a direct non-virtual base class and an inherited virtual base 2248 // class, the mem-initializer is ill-formed. 2249 if (DirectBaseSpec && VirtualBaseSpec) 2250 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 CXXBaseSpecifier *BaseSpec 2254 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2255 if (!BaseSpec) 2256 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2257 2258 // Initialize the base. 2259 InitializedEntity BaseEntity = 2260 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2261 InitializationKind Kind = 2262 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2263 Args.getEndLoc()); 2264 2265 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2266 if (BaseInit.isInvalid()) 2267 return true; 2268 2269 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2270 2271 // C++0x [class.base.init]p7: 2272 // The initialization of each base and member constitutes a 2273 // full-expression. 2274 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2275 if (BaseInit.isInvalid()) 2276 return true; 2277 2278 // If we are in a dependent context, template instantiation will 2279 // perform this type-checking again. Just save the arguments that we 2280 // received in a ParenListExpr. 2281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2282 // of the information that we have about the base 2283 // initializer. However, deconstructing the ASTs is a dicey process, 2284 // and this approach is far more likely to get the corner cases right. 2285 if (CurContext->isDependentContext()) 2286 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2287 2288 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2289 BaseSpec->isVirtual(), 2290 Args.getStartLoc(), 2291 BaseInit.takeAs<Expr>(), 2292 Args.getEndLoc(), EllipsisLoc); 2293} 2294 2295// Create a static_cast\<T&&>(expr). 2296static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2297 QualType ExprType = E->getType(); 2298 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2299 SourceLocation ExprLoc = E->getLocStart(); 2300 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2301 TargetType, ExprLoc); 2302 2303 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2304 SourceRange(ExprLoc, ExprLoc), 2305 E->getSourceRange()).take(); 2306} 2307 2308/// ImplicitInitializerKind - How an implicit base or member initializer should 2309/// initialize its base or member. 2310enum ImplicitInitializerKind { 2311 IIK_Default, 2312 IIK_Copy, 2313 IIK_Move 2314}; 2315 2316static bool 2317BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2318 ImplicitInitializerKind ImplicitInitKind, 2319 CXXBaseSpecifier *BaseSpec, 2320 bool IsInheritedVirtualBase, 2321 CXXCtorInitializer *&CXXBaseInit) { 2322 InitializedEntity InitEntity 2323 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2324 IsInheritedVirtualBase); 2325 2326 ExprResult BaseInit; 2327 2328 switch (ImplicitInitKind) { 2329 case IIK_Default: { 2330 InitializationKind InitKind 2331 = InitializationKind::CreateDefault(Constructor->getLocation()); 2332 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2333 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2334 MultiExprArg(SemaRef, 0, 0)); 2335 break; 2336 } 2337 2338 case IIK_Move: 2339 case IIK_Copy: { 2340 bool Moving = ImplicitInitKind == IIK_Move; 2341 ParmVarDecl *Param = Constructor->getParamDecl(0); 2342 QualType ParamType = Param->getType().getNonReferenceType(); 2343 2344 Expr *CopyCtorArg = 2345 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2346 Constructor->getLocation(), ParamType, 2347 VK_LValue, 0); 2348 2349 // Cast to the base class to avoid ambiguities. 2350 QualType ArgTy = 2351 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2352 ParamType.getQualifiers()); 2353 2354 if (Moving) { 2355 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2356 } 2357 2358 CXXCastPath BasePath; 2359 BasePath.push_back(BaseSpec); 2360 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2361 CK_UncheckedDerivedToBase, 2362 Moving ? VK_XValue : VK_LValue, 2363 &BasePath).take(); 2364 2365 InitializationKind InitKind 2366 = InitializationKind::CreateDirect(Constructor->getLocation(), 2367 SourceLocation(), SourceLocation()); 2368 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2369 &CopyCtorArg, 1); 2370 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2371 MultiExprArg(&CopyCtorArg, 1)); 2372 break; 2373 } 2374 } 2375 2376 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2377 if (BaseInit.isInvalid()) 2378 return true; 2379 2380 CXXBaseInit = 2381 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2382 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2383 SourceLocation()), 2384 BaseSpec->isVirtual(), 2385 SourceLocation(), 2386 BaseInit.takeAs<Expr>(), 2387 SourceLocation(), 2388 SourceLocation()); 2389 2390 return false; 2391} 2392 2393static bool RefersToRValueRef(Expr *MemRef) { 2394 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2395 return Referenced->getType()->isRValueReferenceType(); 2396} 2397 2398static bool 2399BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 FieldDecl *Field, IndirectFieldDecl *Indirect, 2402 CXXCtorInitializer *&CXXMemberInit) { 2403 if (Field->isInvalidDecl()) 2404 return true; 2405 2406 SourceLocation Loc = Constructor->getLocation(); 2407 2408 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2409 bool Moving = ImplicitInitKind == IIK_Move; 2410 ParmVarDecl *Param = Constructor->getParamDecl(0); 2411 QualType ParamType = Param->getType().getNonReferenceType(); 2412 2413 // Suppress copying zero-width bitfields. 2414 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636}; 2637} 2638 2639/// \brief Determine whether the given indirect field declaration is somewhere 2640/// within an anonymous union. 2641static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2642 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2643 CEnd = F->chain_end(); 2644 C != CEnd; ++C) 2645 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2646 if (Record->isUnion()) 2647 return true; 2648 2649 return false; 2650} 2651 2652/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2653/// array type. 2654static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2655 if (T->isIncompleteArrayType()) 2656 return true; 2657 2658 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2659 if (!ArrayT->getSize()) 2660 return true; 2661 2662 T = ArrayT->getElementType(); 2663 } 2664 2665 return false; 2666} 2667 2668static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2669 FieldDecl *Field, 2670 IndirectFieldDecl *Indirect = 0) { 2671 2672 // Overwhelmingly common case: we have a direct initializer for this field. 2673 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2674 Info.AllToInit.push_back(Init); 2675 return false; 2676 } 2677 2678 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2679 // has a brace-or-equal-initializer, the entity is initialized as specified 2680 // in [dcl.init]. 2681 if (Field->hasInClassInitializer()) { 2682 CXXCtorInitializer *Init; 2683 if (Indirect) 2684 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2685 SourceLocation(), 2686 SourceLocation(), 0, 2687 SourceLocation()); 2688 else 2689 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2690 SourceLocation(), 2691 SourceLocation(), 0, 2692 SourceLocation()); 2693 Info.AllToInit.push_back(Init); 2694 return false; 2695 } 2696 2697 // Don't build an implicit initializer for union members if none was 2698 // explicitly specified. 2699 if (Field->getParent()->isUnion() || 2700 (Indirect && isWithinAnonymousUnion(Indirect))) 2701 return false; 2702 2703 // Don't initialize incomplete or zero-length arrays. 2704 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2705 return false; 2706 2707 // Don't try to build an implicit initializer if there were semantic 2708 // errors in any of the initializers (and therefore we might be 2709 // missing some that the user actually wrote). 2710 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2711 return false; 2712 2713 CXXCtorInitializer *Init = 0; 2714 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2715 Indirect, Init)) 2716 return true; 2717 2718 if (Init) 2719 Info.AllToInit.push_back(Init); 2720 2721 return false; 2722} 2723 2724bool 2725Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2726 CXXCtorInitializer *Initializer) { 2727 assert(Initializer->isDelegatingInitializer()); 2728 Constructor->setNumCtorInitializers(1); 2729 CXXCtorInitializer **initializer = 2730 new (Context) CXXCtorInitializer*[1]; 2731 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2732 Constructor->setCtorInitializers(initializer); 2733 2734 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2735 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2736 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2737 } 2738 2739 DelegatingCtorDecls.push_back(Constructor); 2740 2741 return false; 2742} 2743 2744bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2745 CXXCtorInitializer **Initializers, 2746 unsigned NumInitializers, 2747 bool AnyErrors) { 2748 if (Constructor->isDependentContext()) { 2749 // Just store the initializers as written, they will be checked during 2750 // instantiation. 2751 if (NumInitializers > 0) { 2752 Constructor->setNumCtorInitializers(NumInitializers); 2753 CXXCtorInitializer **baseOrMemberInitializers = 2754 new (Context) CXXCtorInitializer*[NumInitializers]; 2755 memcpy(baseOrMemberInitializers, Initializers, 2756 NumInitializers * sizeof(CXXCtorInitializer*)); 2757 Constructor->setCtorInitializers(baseOrMemberInitializers); 2758 } 2759 2760 return false; 2761 } 2762 2763 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2764 2765 // We need to build the initializer AST according to order of construction 2766 // and not what user specified in the Initializers list. 2767 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2768 if (!ClassDecl) 2769 return true; 2770 2771 bool HadError = false; 2772 2773 for (unsigned i = 0; i < NumInitializers; i++) { 2774 CXXCtorInitializer *Member = Initializers[i]; 2775 2776 if (Member->isBaseInitializer()) 2777 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2778 else 2779 Info.AllBaseFields[Member->getAnyMember()] = Member; 2780 } 2781 2782 // Keep track of the direct virtual bases. 2783 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2784 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2785 E = ClassDecl->bases_end(); I != E; ++I) { 2786 if (I->isVirtual()) 2787 DirectVBases.insert(I); 2788 } 2789 2790 // Push virtual bases before others. 2791 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2792 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2793 2794 if (CXXCtorInitializer *Value 2795 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2796 Info.AllToInit.push_back(Value); 2797 } else if (!AnyErrors) { 2798 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2799 CXXCtorInitializer *CXXBaseInit; 2800 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2801 VBase, IsInheritedVirtualBase, 2802 CXXBaseInit)) { 2803 HadError = true; 2804 continue; 2805 } 2806 2807 Info.AllToInit.push_back(CXXBaseInit); 2808 } 2809 } 2810 2811 // Non-virtual bases. 2812 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2813 E = ClassDecl->bases_end(); Base != E; ++Base) { 2814 // Virtuals are in the virtual base list and already constructed. 2815 if (Base->isVirtual()) 2816 continue; 2817 2818 if (CXXCtorInitializer *Value 2819 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2820 Info.AllToInit.push_back(Value); 2821 } else if (!AnyErrors) { 2822 CXXCtorInitializer *CXXBaseInit; 2823 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2824 Base, /*IsInheritedVirtualBase=*/false, 2825 CXXBaseInit)) { 2826 HadError = true; 2827 continue; 2828 } 2829 2830 Info.AllToInit.push_back(CXXBaseInit); 2831 } 2832 } 2833 2834 // Fields. 2835 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2836 MemEnd = ClassDecl->decls_end(); 2837 Mem != MemEnd; ++Mem) { 2838 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2839 // C++ [class.bit]p2: 2840 // A declaration for a bit-field that omits the identifier declares an 2841 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2842 // initialized. 2843 if (F->isUnnamedBitfield()) 2844 continue; 2845 2846 // If we're not generating the implicit copy/move constructor, then we'll 2847 // handle anonymous struct/union fields based on their individual 2848 // indirect fields. 2849 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2850 continue; 2851 2852 if (CollectFieldInitializer(*this, Info, F)) 2853 HadError = true; 2854 continue; 2855 } 2856 2857 // Beyond this point, we only consider default initialization. 2858 if (Info.IIK != IIK_Default) 2859 continue; 2860 2861 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2862 if (F->getType()->isIncompleteArrayType()) { 2863 assert(ClassDecl->hasFlexibleArrayMember() && 2864 "Incomplete array type is not valid"); 2865 continue; 2866 } 2867 2868 // Initialize each field of an anonymous struct individually. 2869 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2870 HadError = true; 2871 2872 continue; 2873 } 2874 } 2875 2876 NumInitializers = Info.AllToInit.size(); 2877 if (NumInitializers > 0) { 2878 Constructor->setNumCtorInitializers(NumInitializers); 2879 CXXCtorInitializer **baseOrMemberInitializers = 2880 new (Context) CXXCtorInitializer*[NumInitializers]; 2881 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2882 NumInitializers * sizeof(CXXCtorInitializer*)); 2883 Constructor->setCtorInitializers(baseOrMemberInitializers); 2884 2885 // Constructors implicitly reference the base and member 2886 // destructors. 2887 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2888 Constructor->getParent()); 2889 } 2890 2891 return HadError; 2892} 2893 2894static void *GetKeyForTopLevelField(FieldDecl *Field) { 2895 // For anonymous unions, use the class declaration as the key. 2896 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2897 if (RT->getDecl()->isAnonymousStructOrUnion()) 2898 return static_cast<void *>(RT->getDecl()); 2899 } 2900 return static_cast<void *>(Field); 2901} 2902 2903static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2904 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2905} 2906 2907static void *GetKeyForMember(ASTContext &Context, 2908 CXXCtorInitializer *Member) { 2909 if (!Member->isAnyMemberInitializer()) 2910 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2911 2912 // For fields injected into the class via declaration of an anonymous union, 2913 // use its anonymous union class declaration as the unique key. 2914 FieldDecl *Field = Member->getAnyMember(); 2915 2916 // If the field is a member of an anonymous struct or union, our key 2917 // is the anonymous record decl that's a direct child of the class. 2918 RecordDecl *RD = Field->getParent(); 2919 if (RD->isAnonymousStructOrUnion()) { 2920 while (true) { 2921 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2922 if (Parent->isAnonymousStructOrUnion()) 2923 RD = Parent; 2924 else 2925 break; 2926 } 2927 2928 return static_cast<void *>(RD); 2929 } 2930 2931 return static_cast<void *>(Field); 2932} 2933 2934static void 2935DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2936 const CXXConstructorDecl *Constructor, 2937 CXXCtorInitializer **Inits, 2938 unsigned NumInits) { 2939 if (Constructor->getDeclContext()->isDependentContext()) 2940 return; 2941 2942 // Don't check initializers order unless the warning is enabled at the 2943 // location of at least one initializer. 2944 bool ShouldCheckOrder = false; 2945 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2946 CXXCtorInitializer *Init = Inits[InitIndex]; 2947 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2948 Init->getSourceLocation()) 2949 != DiagnosticsEngine::Ignored) { 2950 ShouldCheckOrder = true; 2951 break; 2952 } 2953 } 2954 if (!ShouldCheckOrder) 2955 return; 2956 2957 // Build the list of bases and members in the order that they'll 2958 // actually be initialized. The explicit initializers should be in 2959 // this same order but may be missing things. 2960 SmallVector<const void*, 32> IdealInitKeys; 2961 2962 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2963 2964 // 1. Virtual bases. 2965 for (CXXRecordDecl::base_class_const_iterator VBase = 2966 ClassDecl->vbases_begin(), 2967 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2968 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2969 2970 // 2. Non-virtual bases. 2971 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2972 E = ClassDecl->bases_end(); Base != E; ++Base) { 2973 if (Base->isVirtual()) 2974 continue; 2975 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2976 } 2977 2978 // 3. Direct fields. 2979 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2980 E = ClassDecl->field_end(); Field != E; ++Field) { 2981 if (Field->isUnnamedBitfield()) 2982 continue; 2983 2984 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2985 } 2986 2987 unsigned NumIdealInits = IdealInitKeys.size(); 2988 unsigned IdealIndex = 0; 2989 2990 CXXCtorInitializer *PrevInit = 0; 2991 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2992 CXXCtorInitializer *Init = Inits[InitIndex]; 2993 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2994 2995 // Scan forward to try to find this initializer in the idealized 2996 // initializers list. 2997 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2998 if (InitKey == IdealInitKeys[IdealIndex]) 2999 break; 3000 3001 // If we didn't find this initializer, it must be because we 3002 // scanned past it on a previous iteration. That can only 3003 // happen if we're out of order; emit a warning. 3004 if (IdealIndex == NumIdealInits && PrevInit) { 3005 Sema::SemaDiagnosticBuilder D = 3006 SemaRef.Diag(PrevInit->getSourceLocation(), 3007 diag::warn_initializer_out_of_order); 3008 3009 if (PrevInit->isAnyMemberInitializer()) 3010 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3011 else 3012 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3013 3014 if (Init->isAnyMemberInitializer()) 3015 D << 0 << Init->getAnyMember()->getDeclName(); 3016 else 3017 D << 1 << Init->getTypeSourceInfo()->getType(); 3018 3019 // Move back to the initializer's location in the ideal list. 3020 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3021 if (InitKey == IdealInitKeys[IdealIndex]) 3022 break; 3023 3024 assert(IdealIndex != NumIdealInits && 3025 "initializer not found in initializer list"); 3026 } 3027 3028 PrevInit = Init; 3029 } 3030} 3031 3032namespace { 3033bool CheckRedundantInit(Sema &S, 3034 CXXCtorInitializer *Init, 3035 CXXCtorInitializer *&PrevInit) { 3036 if (!PrevInit) { 3037 PrevInit = Init; 3038 return false; 3039 } 3040 3041 if (FieldDecl *Field = Init->getMember()) 3042 S.Diag(Init->getSourceLocation(), 3043 diag::err_multiple_mem_initialization) 3044 << Field->getDeclName() 3045 << Init->getSourceRange(); 3046 else { 3047 const Type *BaseClass = Init->getBaseClass(); 3048 assert(BaseClass && "neither field nor base"); 3049 S.Diag(Init->getSourceLocation(), 3050 diag::err_multiple_base_initialization) 3051 << QualType(BaseClass, 0) 3052 << Init->getSourceRange(); 3053 } 3054 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3055 << 0 << PrevInit->getSourceRange(); 3056 3057 return true; 3058} 3059 3060typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3061typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3062 3063bool CheckRedundantUnionInit(Sema &S, 3064 CXXCtorInitializer *Init, 3065 RedundantUnionMap &Unions) { 3066 FieldDecl *Field = Init->getAnyMember(); 3067 RecordDecl *Parent = Field->getParent(); 3068 NamedDecl *Child = Field; 3069 3070 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3071 if (Parent->isUnion()) { 3072 UnionEntry &En = Unions[Parent]; 3073 if (En.first && En.first != Child) { 3074 S.Diag(Init->getSourceLocation(), 3075 diag::err_multiple_mem_union_initialization) 3076 << Field->getDeclName() 3077 << Init->getSourceRange(); 3078 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3079 << 0 << En.second->getSourceRange(); 3080 return true; 3081 } 3082 if (!En.first) { 3083 En.first = Child; 3084 En.second = Init; 3085 } 3086 if (!Parent->isAnonymousStructOrUnion()) 3087 return false; 3088 } 3089 3090 Child = Parent; 3091 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3092 } 3093 3094 return false; 3095} 3096} 3097 3098/// ActOnMemInitializers - Handle the member initializers for a constructor. 3099void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3100 SourceLocation ColonLoc, 3101 CXXCtorInitializer **meminits, 3102 unsigned NumMemInits, 3103 bool AnyErrors) { 3104 if (!ConstructorDecl) 3105 return; 3106 3107 AdjustDeclIfTemplate(ConstructorDecl); 3108 3109 CXXConstructorDecl *Constructor 3110 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3111 3112 if (!Constructor) { 3113 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3114 return; 3115 } 3116 3117 CXXCtorInitializer **MemInits = 3118 reinterpret_cast<CXXCtorInitializer **>(meminits); 3119 3120 // Mapping for the duplicate initializers check. 3121 // For member initializers, this is keyed with a FieldDecl*. 3122 // For base initializers, this is keyed with a Type*. 3123 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3124 3125 // Mapping for the inconsistent anonymous-union initializers check. 3126 RedundantUnionMap MemberUnions; 3127 3128 bool HadError = false; 3129 for (unsigned i = 0; i < NumMemInits; i++) { 3130 CXXCtorInitializer *Init = MemInits[i]; 3131 3132 // Set the source order index. 3133 Init->setSourceOrder(i); 3134 3135 if (Init->isAnyMemberInitializer()) { 3136 FieldDecl *Field = Init->getAnyMember(); 3137 if (CheckRedundantInit(*this, Init, Members[Field]) || 3138 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3139 HadError = true; 3140 } else if (Init->isBaseInitializer()) { 3141 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3142 if (CheckRedundantInit(*this, Init, Members[Key])) 3143 HadError = true; 3144 } else { 3145 assert(Init->isDelegatingInitializer()); 3146 // This must be the only initializer 3147 if (i != 0 || NumMemInits > 1) { 3148 Diag(MemInits[0]->getSourceLocation(), 3149 diag::err_delegating_initializer_alone) 3150 << MemInits[0]->getSourceRange(); 3151 HadError = true; 3152 // We will treat this as being the only initializer. 3153 } 3154 SetDelegatingInitializer(Constructor, MemInits[i]); 3155 // Return immediately as the initializer is set. 3156 return; 3157 } 3158 } 3159 3160 if (HadError) 3161 return; 3162 3163 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3164 3165 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3166} 3167 3168void 3169Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3170 CXXRecordDecl *ClassDecl) { 3171 // Ignore dependent contexts. Also ignore unions, since their members never 3172 // have destructors implicitly called. 3173 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3174 return; 3175 3176 // FIXME: all the access-control diagnostics are positioned on the 3177 // field/base declaration. That's probably good; that said, the 3178 // user might reasonably want to know why the destructor is being 3179 // emitted, and we currently don't say. 3180 3181 // Non-static data members. 3182 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3183 E = ClassDecl->field_end(); I != E; ++I) { 3184 FieldDecl *Field = *I; 3185 if (Field->isInvalidDecl()) 3186 continue; 3187 3188 // Don't destroy incomplete or zero-length arrays. 3189 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3190 continue; 3191 3192 QualType FieldType = Context.getBaseElementType(Field->getType()); 3193 3194 const RecordType* RT = FieldType->getAs<RecordType>(); 3195 if (!RT) 3196 continue; 3197 3198 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3199 if (FieldClassDecl->isInvalidDecl()) 3200 continue; 3201 if (FieldClassDecl->hasTrivialDestructor()) 3202 continue; 3203 3204 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3205 assert(Dtor && "No dtor found for FieldClassDecl!"); 3206 CheckDestructorAccess(Field->getLocation(), Dtor, 3207 PDiag(diag::err_access_dtor_field) 3208 << Field->getDeclName() 3209 << FieldType); 3210 3211 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3212 } 3213 3214 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3215 3216 // Bases. 3217 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3218 E = ClassDecl->bases_end(); Base != E; ++Base) { 3219 // Bases are always records in a well-formed non-dependent class. 3220 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3221 3222 // Remember direct virtual bases. 3223 if (Base->isVirtual()) 3224 DirectVirtualBases.insert(RT); 3225 3226 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3227 // If our base class is invalid, we probably can't get its dtor anyway. 3228 if (BaseClassDecl->isInvalidDecl()) 3229 continue; 3230 // Ignore trivial destructors. 3231 if (BaseClassDecl->hasTrivialDestructor()) 3232 continue; 3233 3234 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3235 assert(Dtor && "No dtor found for BaseClassDecl!"); 3236 3237 // FIXME: caret should be on the start of the class name 3238 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3239 PDiag(diag::err_access_dtor_base) 3240 << Base->getType() 3241 << Base->getSourceRange()); 3242 3243 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3244 } 3245 3246 // Virtual bases. 3247 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3248 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3249 3250 // Bases are always records in a well-formed non-dependent class. 3251 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3252 3253 // Ignore direct virtual bases. 3254 if (DirectVirtualBases.count(RT)) 3255 continue; 3256 3257 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3258 // If our base class is invalid, we probably can't get its dtor anyway. 3259 if (BaseClassDecl->isInvalidDecl()) 3260 continue; 3261 // Ignore trivial destructors. 3262 if (BaseClassDecl->hasTrivialDestructor()) 3263 continue; 3264 3265 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3266 assert(Dtor && "No dtor found for BaseClassDecl!"); 3267 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3268 PDiag(diag::err_access_dtor_vbase) 3269 << VBase->getType()); 3270 3271 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3272 } 3273} 3274 3275void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3276 if (!CDtorDecl) 3277 return; 3278 3279 if (CXXConstructorDecl *Constructor 3280 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3281 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3282} 3283 3284bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3285 unsigned DiagID, AbstractDiagSelID SelID) { 3286 if (SelID == -1) 3287 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3288 else 3289 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3290} 3291 3292bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3293 const PartialDiagnostic &PD) { 3294 if (!getLangOptions().CPlusPlus) 3295 return false; 3296 3297 if (const ArrayType *AT = Context.getAsArrayType(T)) 3298 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3299 3300 if (const PointerType *PT = T->getAs<PointerType>()) { 3301 // Find the innermost pointer type. 3302 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3303 PT = T; 3304 3305 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3306 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3307 } 3308 3309 const RecordType *RT = T->getAs<RecordType>(); 3310 if (!RT) 3311 return false; 3312 3313 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3314 3315 // We can't answer whether something is abstract until it has a 3316 // definition. If it's currently being defined, we'll walk back 3317 // over all the declarations when we have a full definition. 3318 const CXXRecordDecl *Def = RD->getDefinition(); 3319 if (!Def || Def->isBeingDefined()) 3320 return false; 3321 3322 if (!RD->isAbstract()) 3323 return false; 3324 3325 Diag(Loc, PD) << RD->getDeclName(); 3326 DiagnoseAbstractType(RD); 3327 3328 return true; 3329} 3330 3331void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3332 // Check if we've already emitted the list of pure virtual functions 3333 // for this class. 3334 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3335 return; 3336 3337 CXXFinalOverriderMap FinalOverriders; 3338 RD->getFinalOverriders(FinalOverriders); 3339 3340 // Keep a set of seen pure methods so we won't diagnose the same method 3341 // more than once. 3342 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3343 3344 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3345 MEnd = FinalOverriders.end(); 3346 M != MEnd; 3347 ++M) { 3348 for (OverridingMethods::iterator SO = M->second.begin(), 3349 SOEnd = M->second.end(); 3350 SO != SOEnd; ++SO) { 3351 // C++ [class.abstract]p4: 3352 // A class is abstract if it contains or inherits at least one 3353 // pure virtual function for which the final overrider is pure 3354 // virtual. 3355 3356 // 3357 if (SO->second.size() != 1) 3358 continue; 3359 3360 if (!SO->second.front().Method->isPure()) 3361 continue; 3362 3363 if (!SeenPureMethods.insert(SO->second.front().Method)) 3364 continue; 3365 3366 Diag(SO->second.front().Method->getLocation(), 3367 diag::note_pure_virtual_function) 3368 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3369 } 3370 } 3371 3372 if (!PureVirtualClassDiagSet) 3373 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3374 PureVirtualClassDiagSet->insert(RD); 3375} 3376 3377namespace { 3378struct AbstractUsageInfo { 3379 Sema &S; 3380 CXXRecordDecl *Record; 3381 CanQualType AbstractType; 3382 bool Invalid; 3383 3384 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3385 : S(S), Record(Record), 3386 AbstractType(S.Context.getCanonicalType( 3387 S.Context.getTypeDeclType(Record))), 3388 Invalid(false) {} 3389 3390 void DiagnoseAbstractType() { 3391 if (Invalid) return; 3392 S.DiagnoseAbstractType(Record); 3393 Invalid = true; 3394 } 3395 3396 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3397}; 3398 3399struct CheckAbstractUsage { 3400 AbstractUsageInfo &Info; 3401 const NamedDecl *Ctx; 3402 3403 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3404 : Info(Info), Ctx(Ctx) {} 3405 3406 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3407 switch (TL.getTypeLocClass()) { 3408#define ABSTRACT_TYPELOC(CLASS, PARENT) 3409#define TYPELOC(CLASS, PARENT) \ 3410 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3411#include "clang/AST/TypeLocNodes.def" 3412 } 3413 } 3414 3415 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3416 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3417 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3418 if (!TL.getArg(I)) 3419 continue; 3420 3421 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3422 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3423 } 3424 } 3425 3426 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3427 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3428 } 3429 3430 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3431 // Visit the type parameters from a permissive context. 3432 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3433 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3434 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3435 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3436 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3437 // TODO: other template argument types? 3438 } 3439 } 3440 3441 // Visit pointee types from a permissive context. 3442#define CheckPolymorphic(Type) \ 3443 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3444 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3445 } 3446 CheckPolymorphic(PointerTypeLoc) 3447 CheckPolymorphic(ReferenceTypeLoc) 3448 CheckPolymorphic(MemberPointerTypeLoc) 3449 CheckPolymorphic(BlockPointerTypeLoc) 3450 CheckPolymorphic(AtomicTypeLoc) 3451 3452 /// Handle all the types we haven't given a more specific 3453 /// implementation for above. 3454 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3455 // Every other kind of type that we haven't called out already 3456 // that has an inner type is either (1) sugar or (2) contains that 3457 // inner type in some way as a subobject. 3458 if (TypeLoc Next = TL.getNextTypeLoc()) 3459 return Visit(Next, Sel); 3460 3461 // If there's no inner type and we're in a permissive context, 3462 // don't diagnose. 3463 if (Sel == Sema::AbstractNone) return; 3464 3465 // Check whether the type matches the abstract type. 3466 QualType T = TL.getType(); 3467 if (T->isArrayType()) { 3468 Sel = Sema::AbstractArrayType; 3469 T = Info.S.Context.getBaseElementType(T); 3470 } 3471 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3472 if (CT != Info.AbstractType) return; 3473 3474 // It matched; do some magic. 3475 if (Sel == Sema::AbstractArrayType) { 3476 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3477 << T << TL.getSourceRange(); 3478 } else { 3479 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3480 << Sel << T << TL.getSourceRange(); 3481 } 3482 Info.DiagnoseAbstractType(); 3483 } 3484}; 3485 3486void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3487 Sema::AbstractDiagSelID Sel) { 3488 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3489} 3490 3491} 3492 3493/// Check for invalid uses of an abstract type in a method declaration. 3494static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3495 CXXMethodDecl *MD) { 3496 // No need to do the check on definitions, which require that 3497 // the return/param types be complete. 3498 if (MD->doesThisDeclarationHaveABody()) 3499 return; 3500 3501 // For safety's sake, just ignore it if we don't have type source 3502 // information. This should never happen for non-implicit methods, 3503 // but... 3504 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3505 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3506} 3507 3508/// Check for invalid uses of an abstract type within a class definition. 3509static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3510 CXXRecordDecl *RD) { 3511 for (CXXRecordDecl::decl_iterator 3512 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3513 Decl *D = *I; 3514 if (D->isImplicit()) continue; 3515 3516 // Methods and method templates. 3517 if (isa<CXXMethodDecl>(D)) { 3518 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3519 } else if (isa<FunctionTemplateDecl>(D)) { 3520 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3521 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3522 3523 // Fields and static variables. 3524 } else if (isa<FieldDecl>(D)) { 3525 FieldDecl *FD = cast<FieldDecl>(D); 3526 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3527 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3528 } else if (isa<VarDecl>(D)) { 3529 VarDecl *VD = cast<VarDecl>(D); 3530 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3531 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3532 3533 // Nested classes and class templates. 3534 } else if (isa<CXXRecordDecl>(D)) { 3535 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3536 } else if (isa<ClassTemplateDecl>(D)) { 3537 CheckAbstractClassUsage(Info, 3538 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3539 } 3540 } 3541} 3542 3543/// \brief Perform semantic checks on a class definition that has been 3544/// completing, introducing implicitly-declared members, checking for 3545/// abstract types, etc. 3546void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3547 if (!Record) 3548 return; 3549 3550 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3551 AbstractUsageInfo Info(*this, Record); 3552 CheckAbstractClassUsage(Info, Record); 3553 } 3554 3555 // If this is not an aggregate type and has no user-declared constructor, 3556 // complain about any non-static data members of reference or const scalar 3557 // type, since they will never get initializers. 3558 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3559 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3560 bool Complained = false; 3561 for (RecordDecl::field_iterator F = Record->field_begin(), 3562 FEnd = Record->field_end(); 3563 F != FEnd; ++F) { 3564 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3565 continue; 3566 3567 if (F->getType()->isReferenceType() || 3568 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3569 if (!Complained) { 3570 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3571 << Record->getTagKind() << Record; 3572 Complained = true; 3573 } 3574 3575 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3576 << F->getType()->isReferenceType() 3577 << F->getDeclName(); 3578 } 3579 } 3580 } 3581 3582 if (Record->isDynamicClass() && !Record->isDependentType()) 3583 DynamicClasses.push_back(Record); 3584 3585 if (Record->getIdentifier()) { 3586 // C++ [class.mem]p13: 3587 // If T is the name of a class, then each of the following shall have a 3588 // name different from T: 3589 // - every member of every anonymous union that is a member of class T. 3590 // 3591 // C++ [class.mem]p14: 3592 // In addition, if class T has a user-declared constructor (12.1), every 3593 // non-static data member of class T shall have a name different from T. 3594 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3595 R.first != R.second; ++R.first) { 3596 NamedDecl *D = *R.first; 3597 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3598 isa<IndirectFieldDecl>(D)) { 3599 Diag(D->getLocation(), diag::err_member_name_of_class) 3600 << D->getDeclName(); 3601 break; 3602 } 3603 } 3604 } 3605 3606 // Warn if the class has virtual methods but non-virtual public destructor. 3607 if (Record->isPolymorphic() && !Record->isDependentType()) { 3608 CXXDestructorDecl *dtor = Record->getDestructor(); 3609 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3610 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3611 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3612 } 3613 3614 // See if a method overloads virtual methods in a base 3615 /// class without overriding any. 3616 if (!Record->isDependentType()) { 3617 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3618 MEnd = Record->method_end(); 3619 M != MEnd; ++M) { 3620 if (!(*M)->isStatic()) 3621 DiagnoseHiddenVirtualMethods(Record, *M); 3622 } 3623 } 3624 3625 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3626 // function that is not a constructor declares that member function to be 3627 // const. [...] The class of which that function is a member shall be 3628 // a literal type. 3629 // 3630 // It's fine to diagnose constructors here too: such constructors cannot 3631 // produce a constant expression, so are ill-formed (no diagnostic required). 3632 // 3633 // If the class has virtual bases, any constexpr members will already have 3634 // been diagnosed by the checks performed on the member declaration, so 3635 // suppress this (less useful) diagnostic. 3636 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3637 !Record->isLiteral() && !Record->getNumVBases()) { 3638 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3639 MEnd = Record->method_end(); 3640 M != MEnd; ++M) { 3641 if ((*M)->isConstexpr()) { 3642 switch (Record->getTemplateSpecializationKind()) { 3643 case TSK_ImplicitInstantiation: 3644 case TSK_ExplicitInstantiationDeclaration: 3645 case TSK_ExplicitInstantiationDefinition: 3646 // If a template instantiates to a non-literal type, but its members 3647 // instantiate to constexpr functions, the template is technically 3648 // ill-formed, but we allow it for sanity. Such members are treated as 3649 // non-constexpr. 3650 (*M)->setConstexpr(false); 3651 continue; 3652 3653 case TSK_Undeclared: 3654 case TSK_ExplicitSpecialization: 3655 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3656 PDiag(diag::err_constexpr_method_non_literal)); 3657 break; 3658 } 3659 3660 // Only produce one error per class. 3661 break; 3662 } 3663 } 3664 } 3665 3666 // Declare inherited constructors. We do this eagerly here because: 3667 // - The standard requires an eager diagnostic for conflicting inherited 3668 // constructors from different classes. 3669 // - The lazy declaration of the other implicit constructors is so as to not 3670 // waste space and performance on classes that are not meant to be 3671 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3672 // have inherited constructors. 3673 DeclareInheritedConstructors(Record); 3674 3675 if (!Record->isDependentType()) 3676 CheckExplicitlyDefaultedMethods(Record); 3677} 3678 3679void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3680 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3681 ME = Record->method_end(); 3682 MI != ME; ++MI) { 3683 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3684 switch (getSpecialMember(*MI)) { 3685 case CXXDefaultConstructor: 3686 CheckExplicitlyDefaultedDefaultConstructor( 3687 cast<CXXConstructorDecl>(*MI)); 3688 break; 3689 3690 case CXXDestructor: 3691 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3692 break; 3693 3694 case CXXCopyConstructor: 3695 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3696 break; 3697 3698 case CXXCopyAssignment: 3699 CheckExplicitlyDefaultedCopyAssignment(*MI); 3700 break; 3701 3702 case CXXMoveConstructor: 3703 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3704 break; 3705 3706 case CXXMoveAssignment: 3707 CheckExplicitlyDefaultedMoveAssignment(*MI); 3708 break; 3709 3710 case CXXInvalid: 3711 llvm_unreachable("non-special member explicitly defaulted!"); 3712 } 3713 } 3714 } 3715 3716} 3717 3718void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3719 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3720 3721 // Whether this was the first-declared instance of the constructor. 3722 // This affects whether we implicitly add an exception spec (and, eventually, 3723 // constexpr). It is also ill-formed to explicitly default a constructor such 3724 // that it would be deleted. (C++0x [decl.fct.def.default]) 3725 bool First = CD == CD->getCanonicalDecl(); 3726 3727 bool HadError = false; 3728 if (CD->getNumParams() != 0) { 3729 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3730 << CD->getSourceRange(); 3731 HadError = true; 3732 } 3733 3734 ImplicitExceptionSpecification Spec 3735 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3736 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3737 if (EPI.ExceptionSpecType == EST_Delayed) { 3738 // Exception specification depends on some deferred part of the class. We'll 3739 // try again when the class's definition has been fully processed. 3740 return; 3741 } 3742 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3743 *ExceptionType = Context.getFunctionType( 3744 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3745 3746 if (CtorType->hasExceptionSpec()) { 3747 if (CheckEquivalentExceptionSpec( 3748 PDiag(diag::err_incorrect_defaulted_exception_spec) 3749 << CXXDefaultConstructor, 3750 PDiag(), 3751 ExceptionType, SourceLocation(), 3752 CtorType, CD->getLocation())) { 3753 HadError = true; 3754 } 3755 } else if (First) { 3756 // We set the declaration to have the computed exception spec here. 3757 // We know there are no parameters. 3758 EPI.ExtInfo = CtorType->getExtInfo(); 3759 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3760 } 3761 3762 if (HadError) { 3763 CD->setInvalidDecl(); 3764 return; 3765 } 3766 3767 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3768 if (First) { 3769 CD->setDeletedAsWritten(); 3770 } else { 3771 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3772 << CXXDefaultConstructor; 3773 CD->setInvalidDecl(); 3774 } 3775 } 3776} 3777 3778void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3779 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3780 3781 // Whether this was the first-declared instance of the constructor. 3782 bool First = CD == CD->getCanonicalDecl(); 3783 3784 bool HadError = false; 3785 if (CD->getNumParams() != 1) { 3786 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3787 << CD->getSourceRange(); 3788 HadError = true; 3789 } 3790 3791 ImplicitExceptionSpecification Spec(Context); 3792 bool Const; 3793 llvm::tie(Spec, Const) = 3794 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3795 3796 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3797 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3798 *ExceptionType = Context.getFunctionType( 3799 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3800 3801 // Check for parameter type matching. 3802 // This is a copy ctor so we know it's a cv-qualified reference to T. 3803 QualType ArgType = CtorType->getArgType(0); 3804 if (ArgType->getPointeeType().isVolatileQualified()) { 3805 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3806 HadError = true; 3807 } 3808 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3809 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3810 HadError = true; 3811 } 3812 3813 if (CtorType->hasExceptionSpec()) { 3814 if (CheckEquivalentExceptionSpec( 3815 PDiag(diag::err_incorrect_defaulted_exception_spec) 3816 << CXXCopyConstructor, 3817 PDiag(), 3818 ExceptionType, SourceLocation(), 3819 CtorType, CD->getLocation())) { 3820 HadError = true; 3821 } 3822 } else if (First) { 3823 // We set the declaration to have the computed exception spec here. 3824 // We duplicate the one parameter type. 3825 EPI.ExtInfo = CtorType->getExtInfo(); 3826 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3827 } 3828 3829 if (HadError) { 3830 CD->setInvalidDecl(); 3831 return; 3832 } 3833 3834 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3835 if (First) { 3836 CD->setDeletedAsWritten(); 3837 } else { 3838 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3839 << CXXCopyConstructor; 3840 CD->setInvalidDecl(); 3841 } 3842 } 3843} 3844 3845void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3846 assert(MD->isExplicitlyDefaulted()); 3847 3848 // Whether this was the first-declared instance of the operator 3849 bool First = MD == MD->getCanonicalDecl(); 3850 3851 bool HadError = false; 3852 if (MD->getNumParams() != 1) { 3853 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3854 << MD->getSourceRange(); 3855 HadError = true; 3856 } 3857 3858 QualType ReturnType = 3859 MD->getType()->getAs<FunctionType>()->getResultType(); 3860 if (!ReturnType->isLValueReferenceType() || 3861 !Context.hasSameType( 3862 Context.getCanonicalType(ReturnType->getPointeeType()), 3863 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3864 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3865 HadError = true; 3866 } 3867 3868 ImplicitExceptionSpecification Spec(Context); 3869 bool Const; 3870 llvm::tie(Spec, Const) = 3871 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3872 3873 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3874 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3875 *ExceptionType = Context.getFunctionType( 3876 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3877 3878 QualType ArgType = OperType->getArgType(0); 3879 if (!ArgType->isLValueReferenceType()) { 3880 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3881 HadError = true; 3882 } else { 3883 if (ArgType->getPointeeType().isVolatileQualified()) { 3884 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3885 HadError = true; 3886 } 3887 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3888 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3889 HadError = true; 3890 } 3891 } 3892 3893 if (OperType->getTypeQuals()) { 3894 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3895 HadError = true; 3896 } 3897 3898 if (OperType->hasExceptionSpec()) { 3899 if (CheckEquivalentExceptionSpec( 3900 PDiag(diag::err_incorrect_defaulted_exception_spec) 3901 << CXXCopyAssignment, 3902 PDiag(), 3903 ExceptionType, SourceLocation(), 3904 OperType, MD->getLocation())) { 3905 HadError = true; 3906 } 3907 } else if (First) { 3908 // We set the declaration to have the computed exception spec here. 3909 // We duplicate the one parameter type. 3910 EPI.RefQualifier = OperType->getRefQualifier(); 3911 EPI.ExtInfo = OperType->getExtInfo(); 3912 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3913 } 3914 3915 if (HadError) { 3916 MD->setInvalidDecl(); 3917 return; 3918 } 3919 3920 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3921 if (First) { 3922 MD->setDeletedAsWritten(); 3923 } else { 3924 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3925 << CXXCopyAssignment; 3926 MD->setInvalidDecl(); 3927 } 3928 } 3929} 3930 3931void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3932 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3933 3934 // Whether this was the first-declared instance of the constructor. 3935 bool First = CD == CD->getCanonicalDecl(); 3936 3937 bool HadError = false; 3938 if (CD->getNumParams() != 1) { 3939 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3940 << CD->getSourceRange(); 3941 HadError = true; 3942 } 3943 3944 ImplicitExceptionSpecification Spec( 3945 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3946 3947 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3948 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3949 *ExceptionType = Context.getFunctionType( 3950 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3951 3952 // Check for parameter type matching. 3953 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3954 QualType ArgType = CtorType->getArgType(0); 3955 if (ArgType->getPointeeType().isVolatileQualified()) { 3956 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3957 HadError = true; 3958 } 3959 if (ArgType->getPointeeType().isConstQualified()) { 3960 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3961 HadError = true; 3962 } 3963 3964 if (CtorType->hasExceptionSpec()) { 3965 if (CheckEquivalentExceptionSpec( 3966 PDiag(diag::err_incorrect_defaulted_exception_spec) 3967 << CXXMoveConstructor, 3968 PDiag(), 3969 ExceptionType, SourceLocation(), 3970 CtorType, CD->getLocation())) { 3971 HadError = true; 3972 } 3973 } else if (First) { 3974 // We set the declaration to have the computed exception spec here. 3975 // We duplicate the one parameter type. 3976 EPI.ExtInfo = CtorType->getExtInfo(); 3977 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3978 } 3979 3980 if (HadError) { 3981 CD->setInvalidDecl(); 3982 return; 3983 } 3984 3985 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3986 if (First) { 3987 CD->setDeletedAsWritten(); 3988 } else { 3989 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3990 << CXXMoveConstructor; 3991 CD->setInvalidDecl(); 3992 } 3993 } 3994} 3995 3996void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3997 assert(MD->isExplicitlyDefaulted()); 3998 3999 // Whether this was the first-declared instance of the operator 4000 bool First = MD == MD->getCanonicalDecl(); 4001 4002 bool HadError = false; 4003 if (MD->getNumParams() != 1) { 4004 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4005 << MD->getSourceRange(); 4006 HadError = true; 4007 } 4008 4009 QualType ReturnType = 4010 MD->getType()->getAs<FunctionType>()->getResultType(); 4011 if (!ReturnType->isLValueReferenceType() || 4012 !Context.hasSameType( 4013 Context.getCanonicalType(ReturnType->getPointeeType()), 4014 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4015 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4016 HadError = true; 4017 } 4018 4019 ImplicitExceptionSpecification Spec( 4020 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4021 4022 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4023 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4024 *ExceptionType = Context.getFunctionType( 4025 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4026 4027 QualType ArgType = OperType->getArgType(0); 4028 if (!ArgType->isRValueReferenceType()) { 4029 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4030 HadError = true; 4031 } else { 4032 if (ArgType->getPointeeType().isVolatileQualified()) { 4033 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4034 HadError = true; 4035 } 4036 if (ArgType->getPointeeType().isConstQualified()) { 4037 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4038 HadError = true; 4039 } 4040 } 4041 4042 if (OperType->getTypeQuals()) { 4043 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4044 HadError = true; 4045 } 4046 4047 if (OperType->hasExceptionSpec()) { 4048 if (CheckEquivalentExceptionSpec( 4049 PDiag(diag::err_incorrect_defaulted_exception_spec) 4050 << CXXMoveAssignment, 4051 PDiag(), 4052 ExceptionType, SourceLocation(), 4053 OperType, MD->getLocation())) { 4054 HadError = true; 4055 } 4056 } else if (First) { 4057 // We set the declaration to have the computed exception spec here. 4058 // We duplicate the one parameter type. 4059 EPI.RefQualifier = OperType->getRefQualifier(); 4060 EPI.ExtInfo = OperType->getExtInfo(); 4061 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4062 } 4063 4064 if (HadError) { 4065 MD->setInvalidDecl(); 4066 return; 4067 } 4068 4069 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4070 if (First) { 4071 MD->setDeletedAsWritten(); 4072 } else { 4073 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4074 << CXXMoveAssignment; 4075 MD->setInvalidDecl(); 4076 } 4077 } 4078} 4079 4080void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4081 assert(DD->isExplicitlyDefaulted()); 4082 4083 // Whether this was the first-declared instance of the destructor. 4084 bool First = DD == DD->getCanonicalDecl(); 4085 4086 ImplicitExceptionSpecification Spec 4087 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4088 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4089 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4090 *ExceptionType = Context.getFunctionType( 4091 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4092 4093 if (DtorType->hasExceptionSpec()) { 4094 if (CheckEquivalentExceptionSpec( 4095 PDiag(diag::err_incorrect_defaulted_exception_spec) 4096 << CXXDestructor, 4097 PDiag(), 4098 ExceptionType, SourceLocation(), 4099 DtorType, DD->getLocation())) { 4100 DD->setInvalidDecl(); 4101 return; 4102 } 4103 } else if (First) { 4104 // We set the declaration to have the computed exception spec here. 4105 // There are no parameters. 4106 EPI.ExtInfo = DtorType->getExtInfo(); 4107 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4108 } 4109 4110 if (ShouldDeleteDestructor(DD)) { 4111 if (First) { 4112 DD->setDeletedAsWritten(); 4113 } else { 4114 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4115 << CXXDestructor; 4116 DD->setInvalidDecl(); 4117 } 4118 } 4119} 4120 4121/// This function implements the following C++0x paragraphs: 4122/// - [class.ctor]/5 4123/// - [class.copy]/11 4124bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4125 assert(!MD->isInvalidDecl()); 4126 CXXRecordDecl *RD = MD->getParent(); 4127 assert(!RD->isDependentType() && "do deletion after instantiation"); 4128 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4129 return false; 4130 4131 bool IsUnion = RD->isUnion(); 4132 bool IsConstructor = false; 4133 bool IsAssignment = false; 4134 bool IsMove = false; 4135 4136 bool ConstArg = false; 4137 4138 switch (CSM) { 4139 case CXXDefaultConstructor: 4140 IsConstructor = true; 4141 break; 4142 case CXXCopyConstructor: 4143 IsConstructor = true; 4144 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4145 break; 4146 case CXXMoveConstructor: 4147 IsConstructor = true; 4148 IsMove = true; 4149 break; 4150 default: 4151 llvm_unreachable("function only currently implemented for default ctors"); 4152 } 4153 4154 SourceLocation Loc = MD->getLocation(); 4155 4156 // Do access control from the special member function 4157 ContextRAII MethodContext(*this, MD); 4158 4159 bool AllConst = true; 4160 4161 // We do this because we should never actually use an anonymous 4162 // union's constructor. 4163 if (IsUnion && RD->isAnonymousStructOrUnion()) 4164 return false; 4165 4166 // FIXME: We should put some diagnostic logic right into this function. 4167 4168 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4169 BE = RD->bases_end(); 4170 BI != BE; ++BI) { 4171 // We'll handle this one later 4172 if (BI->isVirtual()) 4173 continue; 4174 4175 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4176 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4177 4178 // Unless we have an assignment operator, the base's destructor must 4179 // be accessible and not deleted. 4180 if (!IsAssignment) { 4181 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4182 if (BaseDtor->isDeleted()) 4183 return true; 4184 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4185 AR_accessible) 4186 return true; 4187 } 4188 4189 // Finding the corresponding member in the base should lead to a 4190 // unique, accessible, non-deleted function. If we are doing 4191 // a destructor, we have already checked this case. 4192 if (CSM != CXXDestructor) { 4193 SpecialMemberOverloadResult *SMOR = 4194 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4195 false); 4196 if (!SMOR->hasSuccess()) 4197 return true; 4198 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4199 if (IsConstructor) { 4200 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4201 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4202 PDiag()) != AR_accessible) 4203 return true; 4204 4205 // For a move operation, the corresponding operation must actually 4206 // be a move operation (and not a copy selected by overload 4207 // resolution) unless we are working on a trivially copyable class. 4208 if (IsMove && !BaseCtor->isMoveConstructor() && 4209 !BaseDecl->isTriviallyCopyable()) 4210 return true; 4211 } 4212 } 4213 } 4214 4215 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4216 BE = RD->vbases_end(); 4217 BI != BE; ++BI) { 4218 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4219 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4220 4221 // Unless we have an assignment operator, the base's destructor must 4222 // be accessible and not deleted. 4223 if (!IsAssignment) { 4224 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4225 if (BaseDtor->isDeleted()) 4226 return true; 4227 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4228 AR_accessible) 4229 return true; 4230 } 4231 4232 // Finding the corresponding member in the base should lead to a 4233 // unique, accessible, non-deleted function. 4234 if (CSM != CXXDestructor) { 4235 SpecialMemberOverloadResult *SMOR = 4236 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4237 false); 4238 if (!SMOR->hasSuccess()) 4239 return true; 4240 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4241 if (IsConstructor) { 4242 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4243 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4244 PDiag()) != AR_accessible) 4245 return true; 4246 4247 // For a move operation, the corresponding operation must actually 4248 // be a move operation (and not a copy selected by overload 4249 // resolution) unless we are working on a trivially copyable class. 4250 if (IsMove && !BaseCtor->isMoveConstructor() && 4251 !BaseDecl->isTriviallyCopyable()) 4252 return true; 4253 } 4254 } 4255 } 4256 4257 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4258 FE = RD->field_end(); 4259 FI != FE; ++FI) { 4260 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4261 continue; 4262 4263 QualType FieldType = Context.getBaseElementType(FI->getType()); 4264 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4265 4266 // For a default constructor, all references must be initialized in-class 4267 // and, if a union, it must have a non-const member. 4268 if (CSM == CXXDefaultConstructor) { 4269 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4270 return true; 4271 4272 if (IsUnion && !FieldType.isConstQualified()) 4273 AllConst = false; 4274 // For a copy constructor, data members must not be of rvalue reference 4275 // type. 4276 } else if (CSM == CXXCopyConstructor) { 4277 if (FieldType->isRValueReferenceType()) 4278 return true; 4279 } 4280 4281 if (FieldRecord) { 4282 // For a default constructor, a const member must have a user-provided 4283 // default constructor or else be explicitly initialized. 4284 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4285 !FI->hasInClassInitializer() && 4286 !FieldRecord->hasUserProvidedDefaultConstructor()) 4287 return true; 4288 4289 // Some additional restrictions exist on the variant members. 4290 if (!IsUnion && FieldRecord->isUnion() && 4291 FieldRecord->isAnonymousStructOrUnion()) { 4292 // We're okay to reuse AllConst here since we only care about the 4293 // value otherwise if we're in a union. 4294 AllConst = true; 4295 4296 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4297 UE = FieldRecord->field_end(); 4298 UI != UE; ++UI) { 4299 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4300 CXXRecordDecl *UnionFieldRecord = 4301 UnionFieldType->getAsCXXRecordDecl(); 4302 4303 if (!UnionFieldType.isConstQualified()) 4304 AllConst = false; 4305 4306 if (UnionFieldRecord) { 4307 // FIXME: Checking for accessibility and validity of this 4308 // destructor is technically going beyond the 4309 // standard, but this is believed to be a defect. 4310 if (!IsAssignment) { 4311 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4312 if (FieldDtor->isDeleted()) 4313 return true; 4314 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4315 AR_accessible) 4316 return true; 4317 if (!FieldDtor->isTrivial()) 4318 return true; 4319 } 4320 4321 if (CSM != CXXDestructor) { 4322 SpecialMemberOverloadResult *SMOR = 4323 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4324 false, false, false); 4325 // FIXME: Checking for accessibility and validity of this 4326 // corresponding member is technically going beyond the 4327 // standard, but this is believed to be a defect. 4328 if (!SMOR->hasSuccess()) 4329 return true; 4330 4331 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4332 // A member of a union must have a trivial corresponding 4333 // constructor. 4334 if (!FieldMember->isTrivial()) 4335 return true; 4336 4337 if (IsConstructor) { 4338 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4339 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4340 PDiag()) != AR_accessible) 4341 return true; 4342 } 4343 } 4344 } 4345 } 4346 4347 // At least one member in each anonymous union must be non-const 4348 if (CSM == CXXDefaultConstructor && AllConst) 4349 return true; 4350 4351 // Don't try to initialize the anonymous union 4352 // This is technically non-conformant, but sanity demands it. 4353 continue; 4354 } 4355 4356 // Unless we're doing assignment, the field's destructor must be 4357 // accessible and not deleted. 4358 if (!IsAssignment) { 4359 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4360 if (FieldDtor->isDeleted()) 4361 return true; 4362 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4363 AR_accessible) 4364 return true; 4365 } 4366 4367 // Check that the corresponding member of the field is accessible, 4368 // unique, and non-deleted. We don't do this if it has an explicit 4369 // initialization when default-constructing. 4370 if (CSM != CXXDestructor && 4371 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4372 SpecialMemberOverloadResult *SMOR = 4373 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4374 false); 4375 if (!SMOR->hasSuccess()) 4376 return true; 4377 4378 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4379 if (IsConstructor) { 4380 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4381 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4382 PDiag()) != AR_accessible) 4383 return true; 4384 4385 // For a move operation, the corresponding operation must actually 4386 // be a move operation (and not a copy selected by overload 4387 // resolution) unless we are working on a trivially copyable class. 4388 if (IsMove && !FieldCtor->isMoveConstructor() && 4389 !FieldRecord->isTriviallyCopyable()) 4390 return true; 4391 } 4392 4393 // We need the corresponding member of a union to be trivial so that 4394 // we can safely copy them all simultaneously. 4395 // FIXME: Note that performing the check here (where we rely on the lack 4396 // of an in-class initializer) is technically ill-formed. However, this 4397 // seems most obviously to be a bug in the standard. 4398 if (IsUnion && !FieldMember->isTrivial()) 4399 return true; 4400 } 4401 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4402 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4403 // We can't initialize a const member of non-class type to any value. 4404 return true; 4405 } 4406 } 4407 4408 // We can't have all const members in a union when default-constructing, 4409 // or else they're all nonsensical garbage values that can't be changed. 4410 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4411 return true; 4412 4413 return false; 4414} 4415 4416bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4417 CXXRecordDecl *RD = MD->getParent(); 4418 assert(!RD->isDependentType() && "do deletion after instantiation"); 4419 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4420 return false; 4421 4422 SourceLocation Loc = MD->getLocation(); 4423 4424 // Do access control from the constructor 4425 ContextRAII MethodContext(*this, MD); 4426 4427 bool Union = RD->isUnion(); 4428 4429 unsigned ArgQuals = 4430 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4431 Qualifiers::Const : 0; 4432 4433 // We do this because we should never actually use an anonymous 4434 // union's constructor. 4435 if (Union && RD->isAnonymousStructOrUnion()) 4436 return false; 4437 4438 // FIXME: We should put some diagnostic logic right into this function. 4439 4440 // C++0x [class.copy]/20 4441 // A defaulted [copy] assignment operator for class X is defined as deleted 4442 // if X has: 4443 4444 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4445 BE = RD->bases_end(); 4446 BI != BE; ++BI) { 4447 // We'll handle this one later 4448 if (BI->isVirtual()) 4449 continue; 4450 4451 QualType BaseType = BI->getType(); 4452 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4453 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4454 4455 // -- a [direct base class] B that cannot be [copied] because overload 4456 // resolution, as applied to B's [copy] assignment operator, results in 4457 // an ambiguity or a function that is deleted or inaccessible from the 4458 // assignment operator 4459 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4460 0); 4461 if (!CopyOper || CopyOper->isDeleted()) 4462 return true; 4463 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4464 return true; 4465 } 4466 4467 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4468 BE = RD->vbases_end(); 4469 BI != BE; ++BI) { 4470 QualType BaseType = BI->getType(); 4471 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4472 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4473 4474 // -- a [virtual base class] B that cannot be [copied] because overload 4475 // resolution, as applied to B's [copy] assignment operator, results in 4476 // an ambiguity or a function that is deleted or inaccessible from the 4477 // assignment operator 4478 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4479 0); 4480 if (!CopyOper || CopyOper->isDeleted()) 4481 return true; 4482 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4483 return true; 4484 } 4485 4486 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4487 FE = RD->field_end(); 4488 FI != FE; ++FI) { 4489 if (FI->isUnnamedBitfield()) 4490 continue; 4491 4492 QualType FieldType = Context.getBaseElementType(FI->getType()); 4493 4494 // -- a non-static data member of reference type 4495 if (FieldType->isReferenceType()) 4496 return true; 4497 4498 // -- a non-static data member of const non-class type (or array thereof) 4499 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4500 return true; 4501 4502 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4503 4504 if (FieldRecord) { 4505 // This is an anonymous union 4506 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4507 // Anonymous unions inside unions do not variant members create 4508 if (!Union) { 4509 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4510 UE = FieldRecord->field_end(); 4511 UI != UE; ++UI) { 4512 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4513 CXXRecordDecl *UnionFieldRecord = 4514 UnionFieldType->getAsCXXRecordDecl(); 4515 4516 // -- a variant member with a non-trivial [copy] assignment operator 4517 // and X is a union-like class 4518 if (UnionFieldRecord && 4519 !UnionFieldRecord->hasTrivialCopyAssignment()) 4520 return true; 4521 } 4522 } 4523 4524 // Don't try to initalize an anonymous union 4525 continue; 4526 // -- a variant member with a non-trivial [copy] assignment operator 4527 // and X is a union-like class 4528 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4529 return true; 4530 } 4531 4532 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4533 false, 0); 4534 if (!CopyOper || CopyOper->isDeleted()) 4535 return true; 4536 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4537 return true; 4538 } 4539 } 4540 4541 return false; 4542} 4543 4544bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4545 CXXRecordDecl *RD = MD->getParent(); 4546 assert(!RD->isDependentType() && "do deletion after instantiation"); 4547 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4548 return false; 4549 4550 SourceLocation Loc = MD->getLocation(); 4551 4552 // Do access control from the constructor 4553 ContextRAII MethodContext(*this, MD); 4554 4555 bool Union = RD->isUnion(); 4556 4557 // We do this because we should never actually use an anonymous 4558 // union's constructor. 4559 if (Union && RD->isAnonymousStructOrUnion()) 4560 return false; 4561 4562 // C++0x [class.copy]/20 4563 // A defaulted [move] assignment operator for class X is defined as deleted 4564 // if X has: 4565 4566 // -- for the move constructor, [...] any direct or indirect virtual base 4567 // class. 4568 if (RD->getNumVBases() != 0) 4569 return true; 4570 4571 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4572 BE = RD->bases_end(); 4573 BI != BE; ++BI) { 4574 4575 QualType BaseType = BI->getType(); 4576 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4577 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4578 4579 // -- a [direct base class] B that cannot be [moved] because overload 4580 // resolution, as applied to B's [move] assignment operator, results in 4581 // an ambiguity or a function that is deleted or inaccessible from the 4582 // assignment operator 4583 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4584 if (!MoveOper || MoveOper->isDeleted()) 4585 return true; 4586 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4587 return true; 4588 4589 // -- for the move assignment operator, a [direct base class] with a type 4590 // that does not have a move assignment operator and is not trivially 4591 // copyable. 4592 if (!MoveOper->isMoveAssignmentOperator() && 4593 !BaseDecl->isTriviallyCopyable()) 4594 return true; 4595 } 4596 4597 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4598 FE = RD->field_end(); 4599 FI != FE; ++FI) { 4600 if (FI->isUnnamedBitfield()) 4601 continue; 4602 4603 QualType FieldType = Context.getBaseElementType(FI->getType()); 4604 4605 // -- a non-static data member of reference type 4606 if (FieldType->isReferenceType()) 4607 return true; 4608 4609 // -- a non-static data member of const non-class type (or array thereof) 4610 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4611 return true; 4612 4613 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4614 4615 if (FieldRecord) { 4616 // This is an anonymous union 4617 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4618 // Anonymous unions inside unions do not variant members create 4619 if (!Union) { 4620 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4621 UE = FieldRecord->field_end(); 4622 UI != UE; ++UI) { 4623 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4624 CXXRecordDecl *UnionFieldRecord = 4625 UnionFieldType->getAsCXXRecordDecl(); 4626 4627 // -- a variant member with a non-trivial [move] assignment operator 4628 // and X is a union-like class 4629 if (UnionFieldRecord && 4630 !UnionFieldRecord->hasTrivialMoveAssignment()) 4631 return true; 4632 } 4633 } 4634 4635 // Don't try to initalize an anonymous union 4636 continue; 4637 // -- a variant member with a non-trivial [move] assignment operator 4638 // and X is a union-like class 4639 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4640 return true; 4641 } 4642 4643 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4644 if (!MoveOper || MoveOper->isDeleted()) 4645 return true; 4646 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4647 return true; 4648 4649 // -- for the move assignment operator, a [non-static data member] with a 4650 // type that does not have a move assignment operator and is not 4651 // trivially copyable. 4652 if (!MoveOper->isMoveAssignmentOperator() && 4653 !FieldRecord->isTriviallyCopyable()) 4654 return true; 4655 } 4656 } 4657 4658 return false; 4659} 4660 4661bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4662 CXXRecordDecl *RD = DD->getParent(); 4663 assert(!RD->isDependentType() && "do deletion after instantiation"); 4664 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4665 return false; 4666 4667 SourceLocation Loc = DD->getLocation(); 4668 4669 // Do access control from the destructor 4670 ContextRAII CtorContext(*this, DD); 4671 4672 bool Union = RD->isUnion(); 4673 4674 // We do this because we should never actually use an anonymous 4675 // union's destructor. 4676 if (Union && RD->isAnonymousStructOrUnion()) 4677 return false; 4678 4679 // C++0x [class.dtor]p5 4680 // A defaulted destructor for a class X is defined as deleted if: 4681 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4682 BE = RD->bases_end(); 4683 BI != BE; ++BI) { 4684 // We'll handle this one later 4685 if (BI->isVirtual()) 4686 continue; 4687 4688 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4689 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4690 assert(BaseDtor && "base has no destructor"); 4691 4692 // -- any direct or virtual base class has a deleted destructor or 4693 // a destructor that is inaccessible from the defaulted destructor 4694 if (BaseDtor->isDeleted()) 4695 return true; 4696 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4697 AR_accessible) 4698 return true; 4699 } 4700 4701 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4702 BE = RD->vbases_end(); 4703 BI != BE; ++BI) { 4704 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4705 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4706 assert(BaseDtor && "base has no destructor"); 4707 4708 // -- any direct or virtual base class has a deleted destructor or 4709 // a destructor that is inaccessible from the defaulted destructor 4710 if (BaseDtor->isDeleted()) 4711 return true; 4712 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4713 AR_accessible) 4714 return true; 4715 } 4716 4717 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4718 FE = RD->field_end(); 4719 FI != FE; ++FI) { 4720 QualType FieldType = Context.getBaseElementType(FI->getType()); 4721 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4722 if (FieldRecord) { 4723 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4724 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4725 UE = FieldRecord->field_end(); 4726 UI != UE; ++UI) { 4727 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4728 CXXRecordDecl *UnionFieldRecord = 4729 UnionFieldType->getAsCXXRecordDecl(); 4730 4731 // -- X is a union-like class that has a variant member with a non- 4732 // trivial destructor. 4733 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4734 return true; 4735 } 4736 // Technically we are supposed to do this next check unconditionally. 4737 // But that makes absolutely no sense. 4738 } else { 4739 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4740 4741 // -- any of the non-static data members has class type M (or array 4742 // thereof) and M has a deleted destructor or a destructor that is 4743 // inaccessible from the defaulted destructor 4744 if (FieldDtor->isDeleted()) 4745 return true; 4746 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4747 AR_accessible) 4748 return true; 4749 4750 // -- X is a union-like class that has a variant member with a non- 4751 // trivial destructor. 4752 if (Union && !FieldDtor->isTrivial()) 4753 return true; 4754 } 4755 } 4756 } 4757 4758 if (DD->isVirtual()) { 4759 FunctionDecl *OperatorDelete = 0; 4760 DeclarationName Name = 4761 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4762 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4763 false)) 4764 return true; 4765 } 4766 4767 4768 return false; 4769} 4770 4771/// \brief Data used with FindHiddenVirtualMethod 4772namespace { 4773 struct FindHiddenVirtualMethodData { 4774 Sema *S; 4775 CXXMethodDecl *Method; 4776 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4777 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4778 }; 4779} 4780 4781/// \brief Member lookup function that determines whether a given C++ 4782/// method overloads virtual methods in a base class without overriding any, 4783/// to be used with CXXRecordDecl::lookupInBases(). 4784static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4785 CXXBasePath &Path, 4786 void *UserData) { 4787 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4788 4789 FindHiddenVirtualMethodData &Data 4790 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4791 4792 DeclarationName Name = Data.Method->getDeclName(); 4793 assert(Name.getNameKind() == DeclarationName::Identifier); 4794 4795 bool foundSameNameMethod = false; 4796 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4797 for (Path.Decls = BaseRecord->lookup(Name); 4798 Path.Decls.first != Path.Decls.second; 4799 ++Path.Decls.first) { 4800 NamedDecl *D = *Path.Decls.first; 4801 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4802 MD = MD->getCanonicalDecl(); 4803 foundSameNameMethod = true; 4804 // Interested only in hidden virtual methods. 4805 if (!MD->isVirtual()) 4806 continue; 4807 // If the method we are checking overrides a method from its base 4808 // don't warn about the other overloaded methods. 4809 if (!Data.S->IsOverload(Data.Method, MD, false)) 4810 return true; 4811 // Collect the overload only if its hidden. 4812 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4813 overloadedMethods.push_back(MD); 4814 } 4815 } 4816 4817 if (foundSameNameMethod) 4818 Data.OverloadedMethods.append(overloadedMethods.begin(), 4819 overloadedMethods.end()); 4820 return foundSameNameMethod; 4821} 4822 4823/// \brief See if a method overloads virtual methods in a base class without 4824/// overriding any. 4825void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4826 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4827 MD->getLocation()) == DiagnosticsEngine::Ignored) 4828 return; 4829 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4830 return; 4831 4832 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4833 /*bool RecordPaths=*/false, 4834 /*bool DetectVirtual=*/false); 4835 FindHiddenVirtualMethodData Data; 4836 Data.Method = MD; 4837 Data.S = this; 4838 4839 // Keep the base methods that were overriden or introduced in the subclass 4840 // by 'using' in a set. A base method not in this set is hidden. 4841 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4842 res.first != res.second; ++res.first) { 4843 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4844 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4845 E = MD->end_overridden_methods(); 4846 I != E; ++I) 4847 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4848 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4849 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4850 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4851 } 4852 4853 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4854 !Data.OverloadedMethods.empty()) { 4855 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4856 << MD << (Data.OverloadedMethods.size() > 1); 4857 4858 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4859 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4860 Diag(overloadedMD->getLocation(), 4861 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4862 } 4863 } 4864} 4865 4866void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4867 Decl *TagDecl, 4868 SourceLocation LBrac, 4869 SourceLocation RBrac, 4870 AttributeList *AttrList) { 4871 if (!TagDecl) 4872 return; 4873 4874 AdjustDeclIfTemplate(TagDecl); 4875 4876 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4877 // strict aliasing violation! 4878 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4879 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4880 4881 CheckCompletedCXXClass( 4882 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4883} 4884 4885/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4886/// special functions, such as the default constructor, copy 4887/// constructor, or destructor, to the given C++ class (C++ 4888/// [special]p1). This routine can only be executed just before the 4889/// definition of the class is complete. 4890void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4891 if (!ClassDecl->hasUserDeclaredConstructor()) 4892 ++ASTContext::NumImplicitDefaultConstructors; 4893 4894 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4895 ++ASTContext::NumImplicitCopyConstructors; 4896 4897 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4898 ++ASTContext::NumImplicitCopyAssignmentOperators; 4899 4900 // If we have a dynamic class, then the copy assignment operator may be 4901 // virtual, so we have to declare it immediately. This ensures that, e.g., 4902 // it shows up in the right place in the vtable and that we diagnose 4903 // problems with the implicit exception specification. 4904 if (ClassDecl->isDynamicClass()) 4905 DeclareImplicitCopyAssignment(ClassDecl); 4906 } 4907 4908 if (!ClassDecl->hasUserDeclaredDestructor()) { 4909 ++ASTContext::NumImplicitDestructors; 4910 4911 // If we have a dynamic class, then the destructor may be virtual, so we 4912 // have to declare the destructor immediately. This ensures that, e.g., it 4913 // shows up in the right place in the vtable and that we diagnose problems 4914 // with the implicit exception specification. 4915 if (ClassDecl->isDynamicClass()) 4916 DeclareImplicitDestructor(ClassDecl); 4917 } 4918} 4919 4920void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4921 if (!D) 4922 return; 4923 4924 int NumParamList = D->getNumTemplateParameterLists(); 4925 for (int i = 0; i < NumParamList; i++) { 4926 TemplateParameterList* Params = D->getTemplateParameterList(i); 4927 for (TemplateParameterList::iterator Param = Params->begin(), 4928 ParamEnd = Params->end(); 4929 Param != ParamEnd; ++Param) { 4930 NamedDecl *Named = cast<NamedDecl>(*Param); 4931 if (Named->getDeclName()) { 4932 S->AddDecl(Named); 4933 IdResolver.AddDecl(Named); 4934 } 4935 } 4936 } 4937} 4938 4939void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4940 if (!D) 4941 return; 4942 4943 TemplateParameterList *Params = 0; 4944 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4945 Params = Template->getTemplateParameters(); 4946 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4947 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4948 Params = PartialSpec->getTemplateParameters(); 4949 else 4950 return; 4951 4952 for (TemplateParameterList::iterator Param = Params->begin(), 4953 ParamEnd = Params->end(); 4954 Param != ParamEnd; ++Param) { 4955 NamedDecl *Named = cast<NamedDecl>(*Param); 4956 if (Named->getDeclName()) { 4957 S->AddDecl(Named); 4958 IdResolver.AddDecl(Named); 4959 } 4960 } 4961} 4962 4963void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4964 if (!RecordD) return; 4965 AdjustDeclIfTemplate(RecordD); 4966 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4967 PushDeclContext(S, Record); 4968} 4969 4970void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4971 if (!RecordD) return; 4972 PopDeclContext(); 4973} 4974 4975/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4976/// parsing a top-level (non-nested) C++ class, and we are now 4977/// parsing those parts of the given Method declaration that could 4978/// not be parsed earlier (C++ [class.mem]p2), such as default 4979/// arguments. This action should enter the scope of the given 4980/// Method declaration as if we had just parsed the qualified method 4981/// name. However, it should not bring the parameters into scope; 4982/// that will be performed by ActOnDelayedCXXMethodParameter. 4983void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4984} 4985 4986/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4987/// C++ method declaration. We're (re-)introducing the given 4988/// function parameter into scope for use in parsing later parts of 4989/// the method declaration. For example, we could see an 4990/// ActOnParamDefaultArgument event for this parameter. 4991void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4992 if (!ParamD) 4993 return; 4994 4995 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4996 4997 // If this parameter has an unparsed default argument, clear it out 4998 // to make way for the parsed default argument. 4999 if (Param->hasUnparsedDefaultArg()) 5000 Param->setDefaultArg(0); 5001 5002 S->AddDecl(Param); 5003 if (Param->getDeclName()) 5004 IdResolver.AddDecl(Param); 5005} 5006 5007/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5008/// processing the delayed method declaration for Method. The method 5009/// declaration is now considered finished. There may be a separate 5010/// ActOnStartOfFunctionDef action later (not necessarily 5011/// immediately!) for this method, if it was also defined inside the 5012/// class body. 5013void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5014 if (!MethodD) 5015 return; 5016 5017 AdjustDeclIfTemplate(MethodD); 5018 5019 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5020 5021 // Now that we have our default arguments, check the constructor 5022 // again. It could produce additional diagnostics or affect whether 5023 // the class has implicitly-declared destructors, among other 5024 // things. 5025 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5026 CheckConstructor(Constructor); 5027 5028 // Check the default arguments, which we may have added. 5029 if (!Method->isInvalidDecl()) 5030 CheckCXXDefaultArguments(Method); 5031} 5032 5033/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5034/// the well-formedness of the constructor declarator @p D with type @p 5035/// R. If there are any errors in the declarator, this routine will 5036/// emit diagnostics and set the invalid bit to true. In any case, the type 5037/// will be updated to reflect a well-formed type for the constructor and 5038/// returned. 5039QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5040 StorageClass &SC) { 5041 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5042 5043 // C++ [class.ctor]p3: 5044 // A constructor shall not be virtual (10.3) or static (9.4). A 5045 // constructor can be invoked for a const, volatile or const 5046 // volatile object. A constructor shall not be declared const, 5047 // volatile, or const volatile (9.3.2). 5048 if (isVirtual) { 5049 if (!D.isInvalidType()) 5050 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5051 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5052 << SourceRange(D.getIdentifierLoc()); 5053 D.setInvalidType(); 5054 } 5055 if (SC == SC_Static) { 5056 if (!D.isInvalidType()) 5057 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5058 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5059 << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 SC = SC_None; 5062 } 5063 5064 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5065 if (FTI.TypeQuals != 0) { 5066 if (FTI.TypeQuals & Qualifiers::Const) 5067 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5068 << "const" << SourceRange(D.getIdentifierLoc()); 5069 if (FTI.TypeQuals & Qualifiers::Volatile) 5070 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5071 << "volatile" << SourceRange(D.getIdentifierLoc()); 5072 if (FTI.TypeQuals & Qualifiers::Restrict) 5073 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5074 << "restrict" << SourceRange(D.getIdentifierLoc()); 5075 D.setInvalidType(); 5076 } 5077 5078 // C++0x [class.ctor]p4: 5079 // A constructor shall not be declared with a ref-qualifier. 5080 if (FTI.hasRefQualifier()) { 5081 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5082 << FTI.RefQualifierIsLValueRef 5083 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5084 D.setInvalidType(); 5085 } 5086 5087 // Rebuild the function type "R" without any type qualifiers (in 5088 // case any of the errors above fired) and with "void" as the 5089 // return type, since constructors don't have return types. 5090 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5091 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5092 return R; 5093 5094 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5095 EPI.TypeQuals = 0; 5096 EPI.RefQualifier = RQ_None; 5097 5098 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5099 Proto->getNumArgs(), EPI); 5100} 5101 5102/// CheckConstructor - Checks a fully-formed constructor for 5103/// well-formedness, issuing any diagnostics required. Returns true if 5104/// the constructor declarator is invalid. 5105void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5106 CXXRecordDecl *ClassDecl 5107 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5108 if (!ClassDecl) 5109 return Constructor->setInvalidDecl(); 5110 5111 // C++ [class.copy]p3: 5112 // A declaration of a constructor for a class X is ill-formed if 5113 // its first parameter is of type (optionally cv-qualified) X and 5114 // either there are no other parameters or else all other 5115 // parameters have default arguments. 5116 if (!Constructor->isInvalidDecl() && 5117 ((Constructor->getNumParams() == 1) || 5118 (Constructor->getNumParams() > 1 && 5119 Constructor->getParamDecl(1)->hasDefaultArg())) && 5120 Constructor->getTemplateSpecializationKind() 5121 != TSK_ImplicitInstantiation) { 5122 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5123 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5124 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5125 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5126 const char *ConstRef 5127 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5128 : " const &"; 5129 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5130 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5131 5132 // FIXME: Rather that making the constructor invalid, we should endeavor 5133 // to fix the type. 5134 Constructor->setInvalidDecl(); 5135 } 5136 } 5137} 5138 5139/// CheckDestructor - Checks a fully-formed destructor definition for 5140/// well-formedness, issuing any diagnostics required. Returns true 5141/// on error. 5142bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5143 CXXRecordDecl *RD = Destructor->getParent(); 5144 5145 if (Destructor->isVirtual()) { 5146 SourceLocation Loc; 5147 5148 if (!Destructor->isImplicit()) 5149 Loc = Destructor->getLocation(); 5150 else 5151 Loc = RD->getLocation(); 5152 5153 // If we have a virtual destructor, look up the deallocation function 5154 FunctionDecl *OperatorDelete = 0; 5155 DeclarationName Name = 5156 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5157 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5158 return true; 5159 5160 MarkDeclarationReferenced(Loc, OperatorDelete); 5161 5162 Destructor->setOperatorDelete(OperatorDelete); 5163 } 5164 5165 return false; 5166} 5167 5168static inline bool 5169FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5170 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5171 FTI.ArgInfo[0].Param && 5172 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5173} 5174 5175/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5176/// the well-formednes of the destructor declarator @p D with type @p 5177/// R. If there are any errors in the declarator, this routine will 5178/// emit diagnostics and set the declarator to invalid. Even if this happens, 5179/// will be updated to reflect a well-formed type for the destructor and 5180/// returned. 5181QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5182 StorageClass& SC) { 5183 // C++ [class.dtor]p1: 5184 // [...] A typedef-name that names a class is a class-name 5185 // (7.1.3); however, a typedef-name that names a class shall not 5186 // be used as the identifier in the declarator for a destructor 5187 // declaration. 5188 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5189 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5190 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5191 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5192 else if (const TemplateSpecializationType *TST = 5193 DeclaratorType->getAs<TemplateSpecializationType>()) 5194 if (TST->isTypeAlias()) 5195 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5196 << DeclaratorType << 1; 5197 5198 // C++ [class.dtor]p2: 5199 // A destructor is used to destroy objects of its class type. A 5200 // destructor takes no parameters, and no return type can be 5201 // specified for it (not even void). The address of a destructor 5202 // shall not be taken. A destructor shall not be static. A 5203 // destructor can be invoked for a const, volatile or const 5204 // volatile object. A destructor shall not be declared const, 5205 // volatile or const volatile (9.3.2). 5206 if (SC == SC_Static) { 5207 if (!D.isInvalidType()) 5208 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5209 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5210 << SourceRange(D.getIdentifierLoc()) 5211 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5212 5213 SC = SC_None; 5214 } 5215 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5216 // Destructors don't have return types, but the parser will 5217 // happily parse something like: 5218 // 5219 // class X { 5220 // float ~X(); 5221 // }; 5222 // 5223 // The return type will be eliminated later. 5224 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5225 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5226 << SourceRange(D.getIdentifierLoc()); 5227 } 5228 5229 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5230 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5231 if (FTI.TypeQuals & Qualifiers::Const) 5232 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5233 << "const" << SourceRange(D.getIdentifierLoc()); 5234 if (FTI.TypeQuals & Qualifiers::Volatile) 5235 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5236 << "volatile" << SourceRange(D.getIdentifierLoc()); 5237 if (FTI.TypeQuals & Qualifiers::Restrict) 5238 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5239 << "restrict" << SourceRange(D.getIdentifierLoc()); 5240 D.setInvalidType(); 5241 } 5242 5243 // C++0x [class.dtor]p2: 5244 // A destructor shall not be declared with a ref-qualifier. 5245 if (FTI.hasRefQualifier()) { 5246 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5247 << FTI.RefQualifierIsLValueRef 5248 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5249 D.setInvalidType(); 5250 } 5251 5252 // Make sure we don't have any parameters. 5253 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5254 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5255 5256 // Delete the parameters. 5257 FTI.freeArgs(); 5258 D.setInvalidType(); 5259 } 5260 5261 // Make sure the destructor isn't variadic. 5262 if (FTI.isVariadic) { 5263 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5264 D.setInvalidType(); 5265 } 5266 5267 // Rebuild the function type "R" without any type qualifiers or 5268 // parameters (in case any of the errors above fired) and with 5269 // "void" as the return type, since destructors don't have return 5270 // types. 5271 if (!D.isInvalidType()) 5272 return R; 5273 5274 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5275 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5276 EPI.Variadic = false; 5277 EPI.TypeQuals = 0; 5278 EPI.RefQualifier = RQ_None; 5279 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5280} 5281 5282/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5283/// well-formednes of the conversion function declarator @p D with 5284/// type @p R. If there are any errors in the declarator, this routine 5285/// will emit diagnostics and return true. Otherwise, it will return 5286/// false. Either way, the type @p R will be updated to reflect a 5287/// well-formed type for the conversion operator. 5288void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5289 StorageClass& SC) { 5290 // C++ [class.conv.fct]p1: 5291 // Neither parameter types nor return type can be specified. The 5292 // type of a conversion function (8.3.5) is "function taking no 5293 // parameter returning conversion-type-id." 5294 if (SC == SC_Static) { 5295 if (!D.isInvalidType()) 5296 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5297 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5298 << SourceRange(D.getIdentifierLoc()); 5299 D.setInvalidType(); 5300 SC = SC_None; 5301 } 5302 5303 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5304 5305 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5306 // Conversion functions don't have return types, but the parser will 5307 // happily parse something like: 5308 // 5309 // class X { 5310 // float operator bool(); 5311 // }; 5312 // 5313 // The return type will be changed later anyway. 5314 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5315 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5316 << SourceRange(D.getIdentifierLoc()); 5317 D.setInvalidType(); 5318 } 5319 5320 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5321 5322 // Make sure we don't have any parameters. 5323 if (Proto->getNumArgs() > 0) { 5324 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5325 5326 // Delete the parameters. 5327 D.getFunctionTypeInfo().freeArgs(); 5328 D.setInvalidType(); 5329 } else if (Proto->isVariadic()) { 5330 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5331 D.setInvalidType(); 5332 } 5333 5334 // Diagnose "&operator bool()" and other such nonsense. This 5335 // is actually a gcc extension which we don't support. 5336 if (Proto->getResultType() != ConvType) { 5337 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5338 << Proto->getResultType(); 5339 D.setInvalidType(); 5340 ConvType = Proto->getResultType(); 5341 } 5342 5343 // C++ [class.conv.fct]p4: 5344 // The conversion-type-id shall not represent a function type nor 5345 // an array type. 5346 if (ConvType->isArrayType()) { 5347 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5348 ConvType = Context.getPointerType(ConvType); 5349 D.setInvalidType(); 5350 } else if (ConvType->isFunctionType()) { 5351 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5352 ConvType = Context.getPointerType(ConvType); 5353 D.setInvalidType(); 5354 } 5355 5356 // Rebuild the function type "R" without any parameters (in case any 5357 // of the errors above fired) and with the conversion type as the 5358 // return type. 5359 if (D.isInvalidType()) 5360 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5361 5362 // C++0x explicit conversion operators. 5363 if (D.getDeclSpec().isExplicitSpecified()) 5364 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5365 getLangOptions().CPlusPlus0x ? 5366 diag::warn_cxx98_compat_explicit_conversion_functions : 5367 diag::ext_explicit_conversion_functions) 5368 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5369} 5370 5371/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5372/// the declaration of the given C++ conversion function. This routine 5373/// is responsible for recording the conversion function in the C++ 5374/// class, if possible. 5375Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5376 assert(Conversion && "Expected to receive a conversion function declaration"); 5377 5378 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5379 5380 // Make sure we aren't redeclaring the conversion function. 5381 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5382 5383 // C++ [class.conv.fct]p1: 5384 // [...] A conversion function is never used to convert a 5385 // (possibly cv-qualified) object to the (possibly cv-qualified) 5386 // same object type (or a reference to it), to a (possibly 5387 // cv-qualified) base class of that type (or a reference to it), 5388 // or to (possibly cv-qualified) void. 5389 // FIXME: Suppress this warning if the conversion function ends up being a 5390 // virtual function that overrides a virtual function in a base class. 5391 QualType ClassType 5392 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5393 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5394 ConvType = ConvTypeRef->getPointeeType(); 5395 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5396 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5397 /* Suppress diagnostics for instantiations. */; 5398 else if (ConvType->isRecordType()) { 5399 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5400 if (ConvType == ClassType) 5401 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5402 << ClassType; 5403 else if (IsDerivedFrom(ClassType, ConvType)) 5404 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5405 << ClassType << ConvType; 5406 } else if (ConvType->isVoidType()) { 5407 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5408 << ClassType << ConvType; 5409 } 5410 5411 if (FunctionTemplateDecl *ConversionTemplate 5412 = Conversion->getDescribedFunctionTemplate()) 5413 return ConversionTemplate; 5414 5415 return Conversion; 5416} 5417 5418//===----------------------------------------------------------------------===// 5419// Namespace Handling 5420//===----------------------------------------------------------------------===// 5421 5422 5423 5424/// ActOnStartNamespaceDef - This is called at the start of a namespace 5425/// definition. 5426Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5427 SourceLocation InlineLoc, 5428 SourceLocation NamespaceLoc, 5429 SourceLocation IdentLoc, 5430 IdentifierInfo *II, 5431 SourceLocation LBrace, 5432 AttributeList *AttrList) { 5433 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5434 // For anonymous namespace, take the location of the left brace. 5435 SourceLocation Loc = II ? IdentLoc : LBrace; 5436 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5437 StartLoc, Loc, II); 5438 Namespc->setInline(InlineLoc.isValid()); 5439 5440 Scope *DeclRegionScope = NamespcScope->getParent(); 5441 5442 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5443 5444 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5445 PushNamespaceVisibilityAttr(Attr); 5446 5447 if (II) { 5448 // C++ [namespace.def]p2: 5449 // The identifier in an original-namespace-definition shall not 5450 // have been previously defined in the declarative region in 5451 // which the original-namespace-definition appears. The 5452 // identifier in an original-namespace-definition is the name of 5453 // the namespace. Subsequently in that declarative region, it is 5454 // treated as an original-namespace-name. 5455 // 5456 // Since namespace names are unique in their scope, and we don't 5457 // look through using directives, just look for any ordinary names. 5458 5459 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5460 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5461 Decl::IDNS_Namespace; 5462 NamedDecl *PrevDecl = 0; 5463 for (DeclContext::lookup_result R 5464 = CurContext->getRedeclContext()->lookup(II); 5465 R.first != R.second; ++R.first) { 5466 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5467 PrevDecl = *R.first; 5468 break; 5469 } 5470 } 5471 5472 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5473 // This is an extended namespace definition. 5474 if (Namespc->isInline() != OrigNS->isInline()) { 5475 // inline-ness must match 5476 if (OrigNS->isInline()) { 5477 // The user probably just forgot the 'inline', so suggest that it 5478 // be added back. 5479 Diag(Namespc->getLocation(), 5480 diag::warn_inline_namespace_reopened_noninline) 5481 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5482 } else { 5483 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5484 << Namespc->isInline(); 5485 } 5486 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5487 5488 // Recover by ignoring the new namespace's inline status. 5489 Namespc->setInline(OrigNS->isInline()); 5490 } 5491 5492 // Attach this namespace decl to the chain of extended namespace 5493 // definitions. 5494 OrigNS->setNextNamespace(Namespc); 5495 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5496 5497 // Remove the previous declaration from the scope. 5498 if (DeclRegionScope->isDeclScope(OrigNS)) { 5499 IdResolver.RemoveDecl(OrigNS); 5500 DeclRegionScope->RemoveDecl(OrigNS); 5501 } 5502 } else if (PrevDecl) { 5503 // This is an invalid name redefinition. 5504 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5505 << Namespc->getDeclName(); 5506 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5507 Namespc->setInvalidDecl(); 5508 // Continue on to push Namespc as current DeclContext and return it. 5509 } else if (II->isStr("std") && 5510 CurContext->getRedeclContext()->isTranslationUnit()) { 5511 // This is the first "real" definition of the namespace "std", so update 5512 // our cache of the "std" namespace to point at this definition. 5513 if (NamespaceDecl *StdNS = getStdNamespace()) { 5514 // We had already defined a dummy namespace "std". Link this new 5515 // namespace definition to the dummy namespace "std". 5516 StdNS->setNextNamespace(Namespc); 5517 StdNS->setLocation(IdentLoc); 5518 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5519 } 5520 5521 // Make our StdNamespace cache point at the first real definition of the 5522 // "std" namespace. 5523 StdNamespace = Namespc; 5524 5525 // Add this instance of "std" to the set of known namespaces 5526 KnownNamespaces[Namespc] = false; 5527 } else if (!Namespc->isInline()) { 5528 // Since this is an "original" namespace, add it to the known set of 5529 // namespaces if it is not an inline namespace. 5530 KnownNamespaces[Namespc] = false; 5531 } 5532 5533 PushOnScopeChains(Namespc, DeclRegionScope); 5534 } else { 5535 // Anonymous namespaces. 5536 assert(Namespc->isAnonymousNamespace()); 5537 5538 // Link the anonymous namespace into its parent. 5539 NamespaceDecl *PrevDecl; 5540 DeclContext *Parent = CurContext->getRedeclContext(); 5541 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5542 PrevDecl = TU->getAnonymousNamespace(); 5543 TU->setAnonymousNamespace(Namespc); 5544 } else { 5545 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5546 PrevDecl = ND->getAnonymousNamespace(); 5547 ND->setAnonymousNamespace(Namespc); 5548 } 5549 5550 // Link the anonymous namespace with its previous declaration. 5551 if (PrevDecl) { 5552 assert(PrevDecl->isAnonymousNamespace()); 5553 assert(!PrevDecl->getNextNamespace()); 5554 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5555 PrevDecl->setNextNamespace(Namespc); 5556 5557 if (Namespc->isInline() != PrevDecl->isInline()) { 5558 // inline-ness must match 5559 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5560 << Namespc->isInline(); 5561 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5562 Namespc->setInvalidDecl(); 5563 // Recover by ignoring the new namespace's inline status. 5564 Namespc->setInline(PrevDecl->isInline()); 5565 } 5566 } 5567 5568 CurContext->addDecl(Namespc); 5569 5570 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5571 // behaves as if it were replaced by 5572 // namespace unique { /* empty body */ } 5573 // using namespace unique; 5574 // namespace unique { namespace-body } 5575 // where all occurrences of 'unique' in a translation unit are 5576 // replaced by the same identifier and this identifier differs 5577 // from all other identifiers in the entire program. 5578 5579 // We just create the namespace with an empty name and then add an 5580 // implicit using declaration, just like the standard suggests. 5581 // 5582 // CodeGen enforces the "universally unique" aspect by giving all 5583 // declarations semantically contained within an anonymous 5584 // namespace internal linkage. 5585 5586 if (!PrevDecl) { 5587 UsingDirectiveDecl* UD 5588 = UsingDirectiveDecl::Create(Context, CurContext, 5589 /* 'using' */ LBrace, 5590 /* 'namespace' */ SourceLocation(), 5591 /* qualifier */ NestedNameSpecifierLoc(), 5592 /* identifier */ SourceLocation(), 5593 Namespc, 5594 /* Ancestor */ CurContext); 5595 UD->setImplicit(); 5596 CurContext->addDecl(UD); 5597 } 5598 } 5599 5600 // Although we could have an invalid decl (i.e. the namespace name is a 5601 // redefinition), push it as current DeclContext and try to continue parsing. 5602 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5603 // for the namespace has the declarations that showed up in that particular 5604 // namespace definition. 5605 PushDeclContext(NamespcScope, Namespc); 5606 return Namespc; 5607} 5608 5609/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5610/// is a namespace alias, returns the namespace it points to. 5611static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5612 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5613 return AD->getNamespace(); 5614 return dyn_cast_or_null<NamespaceDecl>(D); 5615} 5616 5617/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5618/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5619void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5620 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5621 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5622 Namespc->setRBraceLoc(RBrace); 5623 PopDeclContext(); 5624 if (Namespc->hasAttr<VisibilityAttr>()) 5625 PopPragmaVisibility(); 5626} 5627 5628CXXRecordDecl *Sema::getStdBadAlloc() const { 5629 return cast_or_null<CXXRecordDecl>( 5630 StdBadAlloc.get(Context.getExternalSource())); 5631} 5632 5633NamespaceDecl *Sema::getStdNamespace() const { 5634 return cast_or_null<NamespaceDecl>( 5635 StdNamespace.get(Context.getExternalSource())); 5636} 5637 5638/// \brief Retrieve the special "std" namespace, which may require us to 5639/// implicitly define the namespace. 5640NamespaceDecl *Sema::getOrCreateStdNamespace() { 5641 if (!StdNamespace) { 5642 // The "std" namespace has not yet been defined, so build one implicitly. 5643 StdNamespace = NamespaceDecl::Create(Context, 5644 Context.getTranslationUnitDecl(), 5645 SourceLocation(), SourceLocation(), 5646 &PP.getIdentifierTable().get("std")); 5647 getStdNamespace()->setImplicit(true); 5648 } 5649 5650 return getStdNamespace(); 5651} 5652 5653/// \brief Determine whether a using statement is in a context where it will be 5654/// apply in all contexts. 5655static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5656 switch (CurContext->getDeclKind()) { 5657 case Decl::TranslationUnit: 5658 return true; 5659 case Decl::LinkageSpec: 5660 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5661 default: 5662 return false; 5663 } 5664} 5665 5666static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5667 CXXScopeSpec &SS, 5668 SourceLocation IdentLoc, 5669 IdentifierInfo *Ident) { 5670 R.clear(); 5671 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5672 R.getLookupKind(), Sc, &SS, NULL, 5673 false, S.CTC_NoKeywords, NULL)) { 5674 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5675 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5676 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5677 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5678 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5679 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5680 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5681 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5682 else 5683 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5684 << Ident << CorrectedQuotedStr 5685 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5686 5687 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5688 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5689 5690 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5691 R.addDecl(Corrected.getCorrectionDecl()); 5692 return true; 5693 } 5694 R.setLookupName(Ident); 5695 } 5696 return false; 5697} 5698 5699Decl *Sema::ActOnUsingDirective(Scope *S, 5700 SourceLocation UsingLoc, 5701 SourceLocation NamespcLoc, 5702 CXXScopeSpec &SS, 5703 SourceLocation IdentLoc, 5704 IdentifierInfo *NamespcName, 5705 AttributeList *AttrList) { 5706 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5707 assert(NamespcName && "Invalid NamespcName."); 5708 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5709 5710 // This can only happen along a recovery path. 5711 while (S->getFlags() & Scope::TemplateParamScope) 5712 S = S->getParent(); 5713 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5714 5715 UsingDirectiveDecl *UDir = 0; 5716 NestedNameSpecifier *Qualifier = 0; 5717 if (SS.isSet()) 5718 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5719 5720 // Lookup namespace name. 5721 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5722 LookupParsedName(R, S, &SS); 5723 if (R.isAmbiguous()) 5724 return 0; 5725 5726 if (R.empty()) { 5727 R.clear(); 5728 // Allow "using namespace std;" or "using namespace ::std;" even if 5729 // "std" hasn't been defined yet, for GCC compatibility. 5730 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5731 NamespcName->isStr("std")) { 5732 Diag(IdentLoc, diag::ext_using_undefined_std); 5733 R.addDecl(getOrCreateStdNamespace()); 5734 R.resolveKind(); 5735 } 5736 // Otherwise, attempt typo correction. 5737 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5738 } 5739 5740 if (!R.empty()) { 5741 NamedDecl *Named = R.getFoundDecl(); 5742 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5743 && "expected namespace decl"); 5744 // C++ [namespace.udir]p1: 5745 // A using-directive specifies that the names in the nominated 5746 // namespace can be used in the scope in which the 5747 // using-directive appears after the using-directive. During 5748 // unqualified name lookup (3.4.1), the names appear as if they 5749 // were declared in the nearest enclosing namespace which 5750 // contains both the using-directive and the nominated 5751 // namespace. [Note: in this context, "contains" means "contains 5752 // directly or indirectly". ] 5753 5754 // Find enclosing context containing both using-directive and 5755 // nominated namespace. 5756 NamespaceDecl *NS = getNamespaceDecl(Named); 5757 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5758 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5759 CommonAncestor = CommonAncestor->getParent(); 5760 5761 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5762 SS.getWithLocInContext(Context), 5763 IdentLoc, Named, CommonAncestor); 5764 5765 if (IsUsingDirectiveInToplevelContext(CurContext) && 5766 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5767 Diag(IdentLoc, diag::warn_using_directive_in_header); 5768 } 5769 5770 PushUsingDirective(S, UDir); 5771 } else { 5772 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5773 } 5774 5775 // FIXME: We ignore attributes for now. 5776 return UDir; 5777} 5778 5779void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5780 // If scope has associated entity, then using directive is at namespace 5781 // or translation unit scope. We add UsingDirectiveDecls, into 5782 // it's lookup structure. 5783 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5784 Ctx->addDecl(UDir); 5785 else 5786 // Otherwise it is block-sope. using-directives will affect lookup 5787 // only to the end of scope. 5788 S->PushUsingDirective(UDir); 5789} 5790 5791 5792Decl *Sema::ActOnUsingDeclaration(Scope *S, 5793 AccessSpecifier AS, 5794 bool HasUsingKeyword, 5795 SourceLocation UsingLoc, 5796 CXXScopeSpec &SS, 5797 UnqualifiedId &Name, 5798 AttributeList *AttrList, 5799 bool IsTypeName, 5800 SourceLocation TypenameLoc) { 5801 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5802 5803 switch (Name.getKind()) { 5804 case UnqualifiedId::IK_ImplicitSelfParam: 5805 case UnqualifiedId::IK_Identifier: 5806 case UnqualifiedId::IK_OperatorFunctionId: 5807 case UnqualifiedId::IK_LiteralOperatorId: 5808 case UnqualifiedId::IK_ConversionFunctionId: 5809 break; 5810 5811 case UnqualifiedId::IK_ConstructorName: 5812 case UnqualifiedId::IK_ConstructorTemplateId: 5813 // C++0x inherited constructors. 5814 Diag(Name.getSourceRange().getBegin(), 5815 getLangOptions().CPlusPlus0x ? 5816 diag::warn_cxx98_compat_using_decl_constructor : 5817 diag::err_using_decl_constructor) 5818 << SS.getRange(); 5819 5820 if (getLangOptions().CPlusPlus0x) break; 5821 5822 return 0; 5823 5824 case UnqualifiedId::IK_DestructorName: 5825 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5826 << SS.getRange(); 5827 return 0; 5828 5829 case UnqualifiedId::IK_TemplateId: 5830 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5831 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5832 return 0; 5833 } 5834 5835 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5836 DeclarationName TargetName = TargetNameInfo.getName(); 5837 if (!TargetName) 5838 return 0; 5839 5840 // Warn about using declarations. 5841 // TODO: store that the declaration was written without 'using' and 5842 // talk about access decls instead of using decls in the 5843 // diagnostics. 5844 if (!HasUsingKeyword) { 5845 UsingLoc = Name.getSourceRange().getBegin(); 5846 5847 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5848 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5849 } 5850 5851 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5852 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5853 return 0; 5854 5855 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5856 TargetNameInfo, AttrList, 5857 /* IsInstantiation */ false, 5858 IsTypeName, TypenameLoc); 5859 if (UD) 5860 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5861 5862 return UD; 5863} 5864 5865/// \brief Determine whether a using declaration considers the given 5866/// declarations as "equivalent", e.g., if they are redeclarations of 5867/// the same entity or are both typedefs of the same type. 5868static bool 5869IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5870 bool &SuppressRedeclaration) { 5871 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5872 SuppressRedeclaration = false; 5873 return true; 5874 } 5875 5876 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5877 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5878 SuppressRedeclaration = true; 5879 return Context.hasSameType(TD1->getUnderlyingType(), 5880 TD2->getUnderlyingType()); 5881 } 5882 5883 return false; 5884} 5885 5886 5887/// Determines whether to create a using shadow decl for a particular 5888/// decl, given the set of decls existing prior to this using lookup. 5889bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5890 const LookupResult &Previous) { 5891 // Diagnose finding a decl which is not from a base class of the 5892 // current class. We do this now because there are cases where this 5893 // function will silently decide not to build a shadow decl, which 5894 // will pre-empt further diagnostics. 5895 // 5896 // We don't need to do this in C++0x because we do the check once on 5897 // the qualifier. 5898 // 5899 // FIXME: diagnose the following if we care enough: 5900 // struct A { int foo; }; 5901 // struct B : A { using A::foo; }; 5902 // template <class T> struct C : A {}; 5903 // template <class T> struct D : C<T> { using B::foo; } // <--- 5904 // This is invalid (during instantiation) in C++03 because B::foo 5905 // resolves to the using decl in B, which is not a base class of D<T>. 5906 // We can't diagnose it immediately because C<T> is an unknown 5907 // specialization. The UsingShadowDecl in D<T> then points directly 5908 // to A::foo, which will look well-formed when we instantiate. 5909 // The right solution is to not collapse the shadow-decl chain. 5910 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5911 DeclContext *OrigDC = Orig->getDeclContext(); 5912 5913 // Handle enums and anonymous structs. 5914 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5915 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5916 while (OrigRec->isAnonymousStructOrUnion()) 5917 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5918 5919 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5920 if (OrigDC == CurContext) { 5921 Diag(Using->getLocation(), 5922 diag::err_using_decl_nested_name_specifier_is_current_class) 5923 << Using->getQualifierLoc().getSourceRange(); 5924 Diag(Orig->getLocation(), diag::note_using_decl_target); 5925 return true; 5926 } 5927 5928 Diag(Using->getQualifierLoc().getBeginLoc(), 5929 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5930 << Using->getQualifier() 5931 << cast<CXXRecordDecl>(CurContext) 5932 << Using->getQualifierLoc().getSourceRange(); 5933 Diag(Orig->getLocation(), diag::note_using_decl_target); 5934 return true; 5935 } 5936 } 5937 5938 if (Previous.empty()) return false; 5939 5940 NamedDecl *Target = Orig; 5941 if (isa<UsingShadowDecl>(Target)) 5942 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5943 5944 // If the target happens to be one of the previous declarations, we 5945 // don't have a conflict. 5946 // 5947 // FIXME: but we might be increasing its access, in which case we 5948 // should redeclare it. 5949 NamedDecl *NonTag = 0, *Tag = 0; 5950 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5951 I != E; ++I) { 5952 NamedDecl *D = (*I)->getUnderlyingDecl(); 5953 bool Result; 5954 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5955 return Result; 5956 5957 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5958 } 5959 5960 if (Target->isFunctionOrFunctionTemplate()) { 5961 FunctionDecl *FD; 5962 if (isa<FunctionTemplateDecl>(Target)) 5963 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5964 else 5965 FD = cast<FunctionDecl>(Target); 5966 5967 NamedDecl *OldDecl = 0; 5968 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5969 case Ovl_Overload: 5970 return false; 5971 5972 case Ovl_NonFunction: 5973 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5974 break; 5975 5976 // We found a decl with the exact signature. 5977 case Ovl_Match: 5978 // If we're in a record, we want to hide the target, so we 5979 // return true (without a diagnostic) to tell the caller not to 5980 // build a shadow decl. 5981 if (CurContext->isRecord()) 5982 return true; 5983 5984 // If we're not in a record, this is an error. 5985 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5986 break; 5987 } 5988 5989 Diag(Target->getLocation(), diag::note_using_decl_target); 5990 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5991 return true; 5992 } 5993 5994 // Target is not a function. 5995 5996 if (isa<TagDecl>(Target)) { 5997 // No conflict between a tag and a non-tag. 5998 if (!Tag) return false; 5999 6000 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6001 Diag(Target->getLocation(), diag::note_using_decl_target); 6002 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6003 return true; 6004 } 6005 6006 // No conflict between a tag and a non-tag. 6007 if (!NonTag) return false; 6008 6009 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6010 Diag(Target->getLocation(), diag::note_using_decl_target); 6011 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6012 return true; 6013} 6014 6015/// Builds a shadow declaration corresponding to a 'using' declaration. 6016UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6017 UsingDecl *UD, 6018 NamedDecl *Orig) { 6019 6020 // If we resolved to another shadow declaration, just coalesce them. 6021 NamedDecl *Target = Orig; 6022 if (isa<UsingShadowDecl>(Target)) { 6023 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6024 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6025 } 6026 6027 UsingShadowDecl *Shadow 6028 = UsingShadowDecl::Create(Context, CurContext, 6029 UD->getLocation(), UD, Target); 6030 UD->addShadowDecl(Shadow); 6031 6032 Shadow->setAccess(UD->getAccess()); 6033 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6034 Shadow->setInvalidDecl(); 6035 6036 if (S) 6037 PushOnScopeChains(Shadow, S); 6038 else 6039 CurContext->addDecl(Shadow); 6040 6041 6042 return Shadow; 6043} 6044 6045/// Hides a using shadow declaration. This is required by the current 6046/// using-decl implementation when a resolvable using declaration in a 6047/// class is followed by a declaration which would hide or override 6048/// one or more of the using decl's targets; for example: 6049/// 6050/// struct Base { void foo(int); }; 6051/// struct Derived : Base { 6052/// using Base::foo; 6053/// void foo(int); 6054/// }; 6055/// 6056/// The governing language is C++03 [namespace.udecl]p12: 6057/// 6058/// When a using-declaration brings names from a base class into a 6059/// derived class scope, member functions in the derived class 6060/// override and/or hide member functions with the same name and 6061/// parameter types in a base class (rather than conflicting). 6062/// 6063/// There are two ways to implement this: 6064/// (1) optimistically create shadow decls when they're not hidden 6065/// by existing declarations, or 6066/// (2) don't create any shadow decls (or at least don't make them 6067/// visible) until we've fully parsed/instantiated the class. 6068/// The problem with (1) is that we might have to retroactively remove 6069/// a shadow decl, which requires several O(n) operations because the 6070/// decl structures are (very reasonably) not designed for removal. 6071/// (2) avoids this but is very fiddly and phase-dependent. 6072void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6073 if (Shadow->getDeclName().getNameKind() == 6074 DeclarationName::CXXConversionFunctionName) 6075 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6076 6077 // Remove it from the DeclContext... 6078 Shadow->getDeclContext()->removeDecl(Shadow); 6079 6080 // ...and the scope, if applicable... 6081 if (S) { 6082 S->RemoveDecl(Shadow); 6083 IdResolver.RemoveDecl(Shadow); 6084 } 6085 6086 // ...and the using decl. 6087 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6088 6089 // TODO: complain somehow if Shadow was used. It shouldn't 6090 // be possible for this to happen, because...? 6091} 6092 6093/// Builds a using declaration. 6094/// 6095/// \param IsInstantiation - Whether this call arises from an 6096/// instantiation of an unresolved using declaration. We treat 6097/// the lookup differently for these declarations. 6098NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6099 SourceLocation UsingLoc, 6100 CXXScopeSpec &SS, 6101 const DeclarationNameInfo &NameInfo, 6102 AttributeList *AttrList, 6103 bool IsInstantiation, 6104 bool IsTypeName, 6105 SourceLocation TypenameLoc) { 6106 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6107 SourceLocation IdentLoc = NameInfo.getLoc(); 6108 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6109 6110 // FIXME: We ignore attributes for now. 6111 6112 if (SS.isEmpty()) { 6113 Diag(IdentLoc, diag::err_using_requires_qualname); 6114 return 0; 6115 } 6116 6117 // Do the redeclaration lookup in the current scope. 6118 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6119 ForRedeclaration); 6120 Previous.setHideTags(false); 6121 if (S) { 6122 LookupName(Previous, S); 6123 6124 // It is really dumb that we have to do this. 6125 LookupResult::Filter F = Previous.makeFilter(); 6126 while (F.hasNext()) { 6127 NamedDecl *D = F.next(); 6128 if (!isDeclInScope(D, CurContext, S)) 6129 F.erase(); 6130 } 6131 F.done(); 6132 } else { 6133 assert(IsInstantiation && "no scope in non-instantiation"); 6134 assert(CurContext->isRecord() && "scope not record in instantiation"); 6135 LookupQualifiedName(Previous, CurContext); 6136 } 6137 6138 // Check for invalid redeclarations. 6139 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6140 return 0; 6141 6142 // Check for bad qualifiers. 6143 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6144 return 0; 6145 6146 DeclContext *LookupContext = computeDeclContext(SS); 6147 NamedDecl *D; 6148 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6149 if (!LookupContext) { 6150 if (IsTypeName) { 6151 // FIXME: not all declaration name kinds are legal here 6152 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6153 UsingLoc, TypenameLoc, 6154 QualifierLoc, 6155 IdentLoc, NameInfo.getName()); 6156 } else { 6157 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6158 QualifierLoc, NameInfo); 6159 } 6160 } else { 6161 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6162 NameInfo, IsTypeName); 6163 } 6164 D->setAccess(AS); 6165 CurContext->addDecl(D); 6166 6167 if (!LookupContext) return D; 6168 UsingDecl *UD = cast<UsingDecl>(D); 6169 6170 if (RequireCompleteDeclContext(SS, LookupContext)) { 6171 UD->setInvalidDecl(); 6172 return UD; 6173 } 6174 6175 // Constructor inheriting using decls get special treatment. 6176 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6177 if (CheckInheritedConstructorUsingDecl(UD)) 6178 UD->setInvalidDecl(); 6179 return UD; 6180 } 6181 6182 // Otherwise, look up the target name. 6183 6184 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6185 6186 // Unlike most lookups, we don't always want to hide tag 6187 // declarations: tag names are visible through the using declaration 6188 // even if hidden by ordinary names, *except* in a dependent context 6189 // where it's important for the sanity of two-phase lookup. 6190 if (!IsInstantiation) 6191 R.setHideTags(false); 6192 6193 LookupQualifiedName(R, LookupContext); 6194 6195 if (R.empty()) { 6196 Diag(IdentLoc, diag::err_no_member) 6197 << NameInfo.getName() << LookupContext << SS.getRange(); 6198 UD->setInvalidDecl(); 6199 return UD; 6200 } 6201 6202 if (R.isAmbiguous()) { 6203 UD->setInvalidDecl(); 6204 return UD; 6205 } 6206 6207 if (IsTypeName) { 6208 // If we asked for a typename and got a non-type decl, error out. 6209 if (!R.getAsSingle<TypeDecl>()) { 6210 Diag(IdentLoc, diag::err_using_typename_non_type); 6211 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6212 Diag((*I)->getUnderlyingDecl()->getLocation(), 6213 diag::note_using_decl_target); 6214 UD->setInvalidDecl(); 6215 return UD; 6216 } 6217 } else { 6218 // If we asked for a non-typename and we got a type, error out, 6219 // but only if this is an instantiation of an unresolved using 6220 // decl. Otherwise just silently find the type name. 6221 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6222 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6223 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6224 UD->setInvalidDecl(); 6225 return UD; 6226 } 6227 } 6228 6229 // C++0x N2914 [namespace.udecl]p6: 6230 // A using-declaration shall not name a namespace. 6231 if (R.getAsSingle<NamespaceDecl>()) { 6232 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6233 << SS.getRange(); 6234 UD->setInvalidDecl(); 6235 return UD; 6236 } 6237 6238 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6239 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6240 BuildUsingShadowDecl(S, UD, *I); 6241 } 6242 6243 return UD; 6244} 6245 6246/// Additional checks for a using declaration referring to a constructor name. 6247bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6248 if (UD->isTypeName()) { 6249 // FIXME: Cannot specify typename when specifying constructor 6250 return true; 6251 } 6252 6253 const Type *SourceType = UD->getQualifier()->getAsType(); 6254 assert(SourceType && 6255 "Using decl naming constructor doesn't have type in scope spec."); 6256 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6257 6258 // Check whether the named type is a direct base class. 6259 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6260 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6261 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6262 BaseIt != BaseE; ++BaseIt) { 6263 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6264 if (CanonicalSourceType == BaseType) 6265 break; 6266 } 6267 6268 if (BaseIt == BaseE) { 6269 // Did not find SourceType in the bases. 6270 Diag(UD->getUsingLocation(), 6271 diag::err_using_decl_constructor_not_in_direct_base) 6272 << UD->getNameInfo().getSourceRange() 6273 << QualType(SourceType, 0) << TargetClass; 6274 return true; 6275 } 6276 6277 BaseIt->setInheritConstructors(); 6278 6279 return false; 6280} 6281 6282/// Checks that the given using declaration is not an invalid 6283/// redeclaration. Note that this is checking only for the using decl 6284/// itself, not for any ill-formedness among the UsingShadowDecls. 6285bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6286 bool isTypeName, 6287 const CXXScopeSpec &SS, 6288 SourceLocation NameLoc, 6289 const LookupResult &Prev) { 6290 // C++03 [namespace.udecl]p8: 6291 // C++0x [namespace.udecl]p10: 6292 // A using-declaration is a declaration and can therefore be used 6293 // repeatedly where (and only where) multiple declarations are 6294 // allowed. 6295 // 6296 // That's in non-member contexts. 6297 if (!CurContext->getRedeclContext()->isRecord()) 6298 return false; 6299 6300 NestedNameSpecifier *Qual 6301 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6302 6303 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6304 NamedDecl *D = *I; 6305 6306 bool DTypename; 6307 NestedNameSpecifier *DQual; 6308 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6309 DTypename = UD->isTypeName(); 6310 DQual = UD->getQualifier(); 6311 } else if (UnresolvedUsingValueDecl *UD 6312 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6313 DTypename = false; 6314 DQual = UD->getQualifier(); 6315 } else if (UnresolvedUsingTypenameDecl *UD 6316 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6317 DTypename = true; 6318 DQual = UD->getQualifier(); 6319 } else continue; 6320 6321 // using decls differ if one says 'typename' and the other doesn't. 6322 // FIXME: non-dependent using decls? 6323 if (isTypeName != DTypename) continue; 6324 6325 // using decls differ if they name different scopes (but note that 6326 // template instantiation can cause this check to trigger when it 6327 // didn't before instantiation). 6328 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6329 Context.getCanonicalNestedNameSpecifier(DQual)) 6330 continue; 6331 6332 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6333 Diag(D->getLocation(), diag::note_using_decl) << 1; 6334 return true; 6335 } 6336 6337 return false; 6338} 6339 6340 6341/// Checks that the given nested-name qualifier used in a using decl 6342/// in the current context is appropriately related to the current 6343/// scope. If an error is found, diagnoses it and returns true. 6344bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6345 const CXXScopeSpec &SS, 6346 SourceLocation NameLoc) { 6347 DeclContext *NamedContext = computeDeclContext(SS); 6348 6349 if (!CurContext->isRecord()) { 6350 // C++03 [namespace.udecl]p3: 6351 // C++0x [namespace.udecl]p8: 6352 // A using-declaration for a class member shall be a member-declaration. 6353 6354 // If we weren't able to compute a valid scope, it must be a 6355 // dependent class scope. 6356 if (!NamedContext || NamedContext->isRecord()) { 6357 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6358 << SS.getRange(); 6359 return true; 6360 } 6361 6362 // Otherwise, everything is known to be fine. 6363 return false; 6364 } 6365 6366 // The current scope is a record. 6367 6368 // If the named context is dependent, we can't decide much. 6369 if (!NamedContext) { 6370 // FIXME: in C++0x, we can diagnose if we can prove that the 6371 // nested-name-specifier does not refer to a base class, which is 6372 // still possible in some cases. 6373 6374 // Otherwise we have to conservatively report that things might be 6375 // okay. 6376 return false; 6377 } 6378 6379 if (!NamedContext->isRecord()) { 6380 // Ideally this would point at the last name in the specifier, 6381 // but we don't have that level of source info. 6382 Diag(SS.getRange().getBegin(), 6383 diag::err_using_decl_nested_name_specifier_is_not_class) 6384 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6385 return true; 6386 } 6387 6388 if (!NamedContext->isDependentContext() && 6389 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6390 return true; 6391 6392 if (getLangOptions().CPlusPlus0x) { 6393 // C++0x [namespace.udecl]p3: 6394 // In a using-declaration used as a member-declaration, the 6395 // nested-name-specifier shall name a base class of the class 6396 // being defined. 6397 6398 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6399 cast<CXXRecordDecl>(NamedContext))) { 6400 if (CurContext == NamedContext) { 6401 Diag(NameLoc, 6402 diag::err_using_decl_nested_name_specifier_is_current_class) 6403 << SS.getRange(); 6404 return true; 6405 } 6406 6407 Diag(SS.getRange().getBegin(), 6408 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6409 << (NestedNameSpecifier*) SS.getScopeRep() 6410 << cast<CXXRecordDecl>(CurContext) 6411 << SS.getRange(); 6412 return true; 6413 } 6414 6415 return false; 6416 } 6417 6418 // C++03 [namespace.udecl]p4: 6419 // A using-declaration used as a member-declaration shall refer 6420 // to a member of a base class of the class being defined [etc.]. 6421 6422 // Salient point: SS doesn't have to name a base class as long as 6423 // lookup only finds members from base classes. Therefore we can 6424 // diagnose here only if we can prove that that can't happen, 6425 // i.e. if the class hierarchies provably don't intersect. 6426 6427 // TODO: it would be nice if "definitely valid" results were cached 6428 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6429 // need to be repeated. 6430 6431 struct UserData { 6432 llvm::DenseSet<const CXXRecordDecl*> Bases; 6433 6434 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6435 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6436 Data->Bases.insert(Base); 6437 return true; 6438 } 6439 6440 bool hasDependentBases(const CXXRecordDecl *Class) { 6441 return !Class->forallBases(collect, this); 6442 } 6443 6444 /// Returns true if the base is dependent or is one of the 6445 /// accumulated base classes. 6446 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6447 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6448 return !Data->Bases.count(Base); 6449 } 6450 6451 bool mightShareBases(const CXXRecordDecl *Class) { 6452 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6453 } 6454 }; 6455 6456 UserData Data; 6457 6458 // Returns false if we find a dependent base. 6459 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6460 return false; 6461 6462 // Returns false if the class has a dependent base or if it or one 6463 // of its bases is present in the base set of the current context. 6464 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6465 return false; 6466 6467 Diag(SS.getRange().getBegin(), 6468 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6469 << (NestedNameSpecifier*) SS.getScopeRep() 6470 << cast<CXXRecordDecl>(CurContext) 6471 << SS.getRange(); 6472 6473 return true; 6474} 6475 6476Decl *Sema::ActOnAliasDeclaration(Scope *S, 6477 AccessSpecifier AS, 6478 MultiTemplateParamsArg TemplateParamLists, 6479 SourceLocation UsingLoc, 6480 UnqualifiedId &Name, 6481 TypeResult Type) { 6482 // Skip up to the relevant declaration scope. 6483 while (S->getFlags() & Scope::TemplateParamScope) 6484 S = S->getParent(); 6485 assert((S->getFlags() & Scope::DeclScope) && 6486 "got alias-declaration outside of declaration scope"); 6487 6488 if (Type.isInvalid()) 6489 return 0; 6490 6491 bool Invalid = false; 6492 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6493 TypeSourceInfo *TInfo = 0; 6494 GetTypeFromParser(Type.get(), &TInfo); 6495 6496 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6497 return 0; 6498 6499 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6500 UPPC_DeclarationType)) { 6501 Invalid = true; 6502 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6503 TInfo->getTypeLoc().getBeginLoc()); 6504 } 6505 6506 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6507 LookupName(Previous, S); 6508 6509 // Warn about shadowing the name of a template parameter. 6510 if (Previous.isSingleResult() && 6511 Previous.getFoundDecl()->isTemplateParameter()) { 6512 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6513 Previous.clear(); 6514 } 6515 6516 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6517 "name in alias declaration must be an identifier"); 6518 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6519 Name.StartLocation, 6520 Name.Identifier, TInfo); 6521 6522 NewTD->setAccess(AS); 6523 6524 if (Invalid) 6525 NewTD->setInvalidDecl(); 6526 6527 CheckTypedefForVariablyModifiedType(S, NewTD); 6528 Invalid |= NewTD->isInvalidDecl(); 6529 6530 bool Redeclaration = false; 6531 6532 NamedDecl *NewND; 6533 if (TemplateParamLists.size()) { 6534 TypeAliasTemplateDecl *OldDecl = 0; 6535 TemplateParameterList *OldTemplateParams = 0; 6536 6537 if (TemplateParamLists.size() != 1) { 6538 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6539 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6540 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6541 } 6542 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6543 6544 // Only consider previous declarations in the same scope. 6545 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6546 /*ExplicitInstantiationOrSpecialization*/false); 6547 if (!Previous.empty()) { 6548 Redeclaration = true; 6549 6550 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6551 if (!OldDecl && !Invalid) { 6552 Diag(UsingLoc, diag::err_redefinition_different_kind) 6553 << Name.Identifier; 6554 6555 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6556 if (OldD->getLocation().isValid()) 6557 Diag(OldD->getLocation(), diag::note_previous_definition); 6558 6559 Invalid = true; 6560 } 6561 6562 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6563 if (TemplateParameterListsAreEqual(TemplateParams, 6564 OldDecl->getTemplateParameters(), 6565 /*Complain=*/true, 6566 TPL_TemplateMatch)) 6567 OldTemplateParams = OldDecl->getTemplateParameters(); 6568 else 6569 Invalid = true; 6570 6571 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6572 if (!Invalid && 6573 !Context.hasSameType(OldTD->getUnderlyingType(), 6574 NewTD->getUnderlyingType())) { 6575 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6576 // but we can't reasonably accept it. 6577 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6578 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6579 if (OldTD->getLocation().isValid()) 6580 Diag(OldTD->getLocation(), diag::note_previous_definition); 6581 Invalid = true; 6582 } 6583 } 6584 } 6585 6586 // Merge any previous default template arguments into our parameters, 6587 // and check the parameter list. 6588 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6589 TPC_TypeAliasTemplate)) 6590 return 0; 6591 6592 TypeAliasTemplateDecl *NewDecl = 6593 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6594 Name.Identifier, TemplateParams, 6595 NewTD); 6596 6597 NewDecl->setAccess(AS); 6598 6599 if (Invalid) 6600 NewDecl->setInvalidDecl(); 6601 else if (OldDecl) 6602 NewDecl->setPreviousDeclaration(OldDecl); 6603 6604 NewND = NewDecl; 6605 } else { 6606 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6607 NewND = NewTD; 6608 } 6609 6610 if (!Redeclaration) 6611 PushOnScopeChains(NewND, S); 6612 6613 return NewND; 6614} 6615 6616Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6617 SourceLocation NamespaceLoc, 6618 SourceLocation AliasLoc, 6619 IdentifierInfo *Alias, 6620 CXXScopeSpec &SS, 6621 SourceLocation IdentLoc, 6622 IdentifierInfo *Ident) { 6623 6624 // Lookup the namespace name. 6625 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6626 LookupParsedName(R, S, &SS); 6627 6628 // Check if we have a previous declaration with the same name. 6629 NamedDecl *PrevDecl 6630 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6631 ForRedeclaration); 6632 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6633 PrevDecl = 0; 6634 6635 if (PrevDecl) { 6636 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6637 // We already have an alias with the same name that points to the same 6638 // namespace, so don't create a new one. 6639 // FIXME: At some point, we'll want to create the (redundant) 6640 // declaration to maintain better source information. 6641 if (!R.isAmbiguous() && !R.empty() && 6642 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6643 return 0; 6644 } 6645 6646 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6647 diag::err_redefinition_different_kind; 6648 Diag(AliasLoc, DiagID) << Alias; 6649 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6650 return 0; 6651 } 6652 6653 if (R.isAmbiguous()) 6654 return 0; 6655 6656 if (R.empty()) { 6657 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6658 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6659 return 0; 6660 } 6661 } 6662 6663 NamespaceAliasDecl *AliasDecl = 6664 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6665 Alias, SS.getWithLocInContext(Context), 6666 IdentLoc, R.getFoundDecl()); 6667 6668 PushOnScopeChains(AliasDecl, S); 6669 return AliasDecl; 6670} 6671 6672namespace { 6673 /// \brief Scoped object used to handle the state changes required in Sema 6674 /// to implicitly define the body of a C++ member function; 6675 class ImplicitlyDefinedFunctionScope { 6676 Sema &S; 6677 Sema::ContextRAII SavedContext; 6678 6679 public: 6680 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6681 : S(S), SavedContext(S, Method) 6682 { 6683 S.PushFunctionScope(); 6684 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6685 } 6686 6687 ~ImplicitlyDefinedFunctionScope() { 6688 S.PopExpressionEvaluationContext(); 6689 S.PopFunctionOrBlockScope(); 6690 } 6691 }; 6692} 6693 6694Sema::ImplicitExceptionSpecification 6695Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6696 // C++ [except.spec]p14: 6697 // An implicitly declared special member function (Clause 12) shall have an 6698 // exception-specification. [...] 6699 ImplicitExceptionSpecification ExceptSpec(Context); 6700 if (ClassDecl->isInvalidDecl()) 6701 return ExceptSpec; 6702 6703 // Direct base-class constructors. 6704 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6705 BEnd = ClassDecl->bases_end(); 6706 B != BEnd; ++B) { 6707 if (B->isVirtual()) // Handled below. 6708 continue; 6709 6710 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6711 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6712 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6713 // If this is a deleted function, add it anyway. This might be conformant 6714 // with the standard. This might not. I'm not sure. It might not matter. 6715 if (Constructor) 6716 ExceptSpec.CalledDecl(Constructor); 6717 } 6718 } 6719 6720 // Virtual base-class constructors. 6721 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6722 BEnd = ClassDecl->vbases_end(); 6723 B != BEnd; ++B) { 6724 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6725 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6726 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6727 // If this is a deleted function, add it anyway. This might be conformant 6728 // with the standard. This might not. I'm not sure. It might not matter. 6729 if (Constructor) 6730 ExceptSpec.CalledDecl(Constructor); 6731 } 6732 } 6733 6734 // Field constructors. 6735 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6736 FEnd = ClassDecl->field_end(); 6737 F != FEnd; ++F) { 6738 if (F->hasInClassInitializer()) { 6739 if (Expr *E = F->getInClassInitializer()) 6740 ExceptSpec.CalledExpr(E); 6741 else if (!F->isInvalidDecl()) 6742 ExceptSpec.SetDelayed(); 6743 } else if (const RecordType *RecordTy 6744 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6745 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6746 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6747 // If this is a deleted function, add it anyway. This might be conformant 6748 // with the standard. This might not. I'm not sure. It might not matter. 6749 // In particular, the problem is that this function never gets called. It 6750 // might just be ill-formed because this function attempts to refer to 6751 // a deleted function here. 6752 if (Constructor) 6753 ExceptSpec.CalledDecl(Constructor); 6754 } 6755 } 6756 6757 return ExceptSpec; 6758} 6759 6760CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6761 CXXRecordDecl *ClassDecl) { 6762 // C++ [class.ctor]p5: 6763 // A default constructor for a class X is a constructor of class X 6764 // that can be called without an argument. If there is no 6765 // user-declared constructor for class X, a default constructor is 6766 // implicitly declared. An implicitly-declared default constructor 6767 // is an inline public member of its class. 6768 assert(!ClassDecl->hasUserDeclaredConstructor() && 6769 "Should not build implicit default constructor!"); 6770 6771 ImplicitExceptionSpecification Spec = 6772 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6773 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6774 6775 // Create the actual constructor declaration. 6776 CanQualType ClassType 6777 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6778 SourceLocation ClassLoc = ClassDecl->getLocation(); 6779 DeclarationName Name 6780 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6781 DeclarationNameInfo NameInfo(Name, ClassLoc); 6782 CXXConstructorDecl *DefaultCon 6783 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6784 Context.getFunctionType(Context.VoidTy, 6785 0, 0, EPI), 6786 /*TInfo=*/0, 6787 /*isExplicit=*/false, 6788 /*isInline=*/true, 6789 /*isImplicitlyDeclared=*/true, 6790 // FIXME: apply the rules for definitions here 6791 /*isConstexpr=*/false); 6792 DefaultCon->setAccess(AS_public); 6793 DefaultCon->setDefaulted(); 6794 DefaultCon->setImplicit(); 6795 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6796 6797 // Note that we have declared this constructor. 6798 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6799 6800 if (Scope *S = getScopeForContext(ClassDecl)) 6801 PushOnScopeChains(DefaultCon, S, false); 6802 ClassDecl->addDecl(DefaultCon); 6803 6804 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6805 DefaultCon->setDeletedAsWritten(); 6806 6807 return DefaultCon; 6808} 6809 6810void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6811 CXXConstructorDecl *Constructor) { 6812 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6813 !Constructor->doesThisDeclarationHaveABody() && 6814 !Constructor->isDeleted()) && 6815 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6816 6817 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6818 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6819 6820 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6821 DiagnosticErrorTrap Trap(Diags); 6822 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6823 Trap.hasErrorOccurred()) { 6824 Diag(CurrentLocation, diag::note_member_synthesized_at) 6825 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6826 Constructor->setInvalidDecl(); 6827 return; 6828 } 6829 6830 SourceLocation Loc = Constructor->getLocation(); 6831 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6832 6833 Constructor->setUsed(); 6834 MarkVTableUsed(CurrentLocation, ClassDecl); 6835 6836 if (ASTMutationListener *L = getASTMutationListener()) { 6837 L->CompletedImplicitDefinition(Constructor); 6838 } 6839} 6840 6841/// Get any existing defaulted default constructor for the given class. Do not 6842/// implicitly define one if it does not exist. 6843static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6844 CXXRecordDecl *D) { 6845 ASTContext &Context = Self.Context; 6846 QualType ClassType = Context.getTypeDeclType(D); 6847 DeclarationName ConstructorName 6848 = Context.DeclarationNames.getCXXConstructorName( 6849 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6850 6851 DeclContext::lookup_const_iterator Con, ConEnd; 6852 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6853 Con != ConEnd; ++Con) { 6854 // A function template cannot be defaulted. 6855 if (isa<FunctionTemplateDecl>(*Con)) 6856 continue; 6857 6858 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6859 if (Constructor->isDefaultConstructor()) 6860 return Constructor->isDefaulted() ? Constructor : 0; 6861 } 6862 return 0; 6863} 6864 6865void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6866 if (!D) return; 6867 AdjustDeclIfTemplate(D); 6868 6869 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6870 CXXConstructorDecl *CtorDecl 6871 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6872 6873 if (!CtorDecl) return; 6874 6875 // Compute the exception specification for the default constructor. 6876 const FunctionProtoType *CtorTy = 6877 CtorDecl->getType()->castAs<FunctionProtoType>(); 6878 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6879 ImplicitExceptionSpecification Spec = 6880 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6881 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6882 assert(EPI.ExceptionSpecType != EST_Delayed); 6883 6884 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6885 } 6886 6887 // If the default constructor is explicitly defaulted, checking the exception 6888 // specification is deferred until now. 6889 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6890 !ClassDecl->isDependentType()) 6891 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6892} 6893 6894void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6895 // We start with an initial pass over the base classes to collect those that 6896 // inherit constructors from. If there are none, we can forgo all further 6897 // processing. 6898 typedef SmallVector<const RecordType *, 4> BasesVector; 6899 BasesVector BasesToInheritFrom; 6900 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6901 BaseE = ClassDecl->bases_end(); 6902 BaseIt != BaseE; ++BaseIt) { 6903 if (BaseIt->getInheritConstructors()) { 6904 QualType Base = BaseIt->getType(); 6905 if (Base->isDependentType()) { 6906 // If we inherit constructors from anything that is dependent, just 6907 // abort processing altogether. We'll get another chance for the 6908 // instantiations. 6909 return; 6910 } 6911 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6912 } 6913 } 6914 if (BasesToInheritFrom.empty()) 6915 return; 6916 6917 // Now collect the constructors that we already have in the current class. 6918 // Those take precedence over inherited constructors. 6919 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6920 // unless there is a user-declared constructor with the same signature in 6921 // the class where the using-declaration appears. 6922 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6923 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6924 CtorE = ClassDecl->ctor_end(); 6925 CtorIt != CtorE; ++CtorIt) { 6926 ExistingConstructors.insert( 6927 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6928 } 6929 6930 Scope *S = getScopeForContext(ClassDecl); 6931 DeclarationName CreatedCtorName = 6932 Context.DeclarationNames.getCXXConstructorName( 6933 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6934 6935 // Now comes the true work. 6936 // First, we keep a map from constructor types to the base that introduced 6937 // them. Needed for finding conflicting constructors. We also keep the 6938 // actually inserted declarations in there, for pretty diagnostics. 6939 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6940 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6941 ConstructorToSourceMap InheritedConstructors; 6942 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6943 BaseE = BasesToInheritFrom.end(); 6944 BaseIt != BaseE; ++BaseIt) { 6945 const RecordType *Base = *BaseIt; 6946 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6947 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6948 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6949 CtorE = BaseDecl->ctor_end(); 6950 CtorIt != CtorE; ++CtorIt) { 6951 // Find the using declaration for inheriting this base's constructors. 6952 DeclarationName Name = 6953 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6954 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6955 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6956 SourceLocation UsingLoc = UD ? UD->getLocation() : 6957 ClassDecl->getLocation(); 6958 6959 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6960 // from the class X named in the using-declaration consists of actual 6961 // constructors and notional constructors that result from the 6962 // transformation of defaulted parameters as follows: 6963 // - all non-template default constructors of X, and 6964 // - for each non-template constructor of X that has at least one 6965 // parameter with a default argument, the set of constructors that 6966 // results from omitting any ellipsis parameter specification and 6967 // successively omitting parameters with a default argument from the 6968 // end of the parameter-type-list. 6969 CXXConstructorDecl *BaseCtor = *CtorIt; 6970 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6971 const FunctionProtoType *BaseCtorType = 6972 BaseCtor->getType()->getAs<FunctionProtoType>(); 6973 6974 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6975 maxParams = BaseCtor->getNumParams(); 6976 params <= maxParams; ++params) { 6977 // Skip default constructors. They're never inherited. 6978 if (params == 0) 6979 continue; 6980 // Skip copy and move constructors for the same reason. 6981 if (CanBeCopyOrMove && params == 1) 6982 continue; 6983 6984 // Build up a function type for this particular constructor. 6985 // FIXME: The working paper does not consider that the exception spec 6986 // for the inheriting constructor might be larger than that of the 6987 // source. This code doesn't yet, either. When it does, this code will 6988 // need to be delayed until after exception specifications and in-class 6989 // member initializers are attached. 6990 const Type *NewCtorType; 6991 if (params == maxParams) 6992 NewCtorType = BaseCtorType; 6993 else { 6994 SmallVector<QualType, 16> Args; 6995 for (unsigned i = 0; i < params; ++i) { 6996 Args.push_back(BaseCtorType->getArgType(i)); 6997 } 6998 FunctionProtoType::ExtProtoInfo ExtInfo = 6999 BaseCtorType->getExtProtoInfo(); 7000 ExtInfo.Variadic = false; 7001 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7002 Args.data(), params, ExtInfo) 7003 .getTypePtr(); 7004 } 7005 const Type *CanonicalNewCtorType = 7006 Context.getCanonicalType(NewCtorType); 7007 7008 // Now that we have the type, first check if the class already has a 7009 // constructor with this signature. 7010 if (ExistingConstructors.count(CanonicalNewCtorType)) 7011 continue; 7012 7013 // Then we check if we have already declared an inherited constructor 7014 // with this signature. 7015 std::pair<ConstructorToSourceMap::iterator, bool> result = 7016 InheritedConstructors.insert(std::make_pair( 7017 CanonicalNewCtorType, 7018 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7019 if (!result.second) { 7020 // Already in the map. If it came from a different class, that's an 7021 // error. Not if it's from the same. 7022 CanQualType PreviousBase = result.first->second.first; 7023 if (CanonicalBase != PreviousBase) { 7024 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7025 const CXXConstructorDecl *PrevBaseCtor = 7026 PrevCtor->getInheritedConstructor(); 7027 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7028 7029 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7030 Diag(BaseCtor->getLocation(), 7031 diag::note_using_decl_constructor_conflict_current_ctor); 7032 Diag(PrevBaseCtor->getLocation(), 7033 diag::note_using_decl_constructor_conflict_previous_ctor); 7034 Diag(PrevCtor->getLocation(), 7035 diag::note_using_decl_constructor_conflict_previous_using); 7036 } 7037 continue; 7038 } 7039 7040 // OK, we're there, now add the constructor. 7041 // C++0x [class.inhctor]p8: [...] that would be performed by a 7042 // user-written inline constructor [...] 7043 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7044 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7045 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7046 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7047 /*ImplicitlyDeclared=*/true, 7048 // FIXME: Due to a defect in the standard, we treat inherited 7049 // constructors as constexpr even if that makes them ill-formed. 7050 /*Constexpr=*/BaseCtor->isConstexpr()); 7051 NewCtor->setAccess(BaseCtor->getAccess()); 7052 7053 // Build up the parameter decls and add them. 7054 SmallVector<ParmVarDecl *, 16> ParamDecls; 7055 for (unsigned i = 0; i < params; ++i) { 7056 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7057 UsingLoc, UsingLoc, 7058 /*IdentifierInfo=*/0, 7059 BaseCtorType->getArgType(i), 7060 /*TInfo=*/0, SC_None, 7061 SC_None, /*DefaultArg=*/0)); 7062 } 7063 NewCtor->setParams(ParamDecls); 7064 NewCtor->setInheritedConstructor(BaseCtor); 7065 7066 PushOnScopeChains(NewCtor, S, false); 7067 ClassDecl->addDecl(NewCtor); 7068 result.first->second.second = NewCtor; 7069 } 7070 } 7071 } 7072} 7073 7074Sema::ImplicitExceptionSpecification 7075Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7076 // C++ [except.spec]p14: 7077 // An implicitly declared special member function (Clause 12) shall have 7078 // an exception-specification. 7079 ImplicitExceptionSpecification ExceptSpec(Context); 7080 if (ClassDecl->isInvalidDecl()) 7081 return ExceptSpec; 7082 7083 // Direct base-class destructors. 7084 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7085 BEnd = ClassDecl->bases_end(); 7086 B != BEnd; ++B) { 7087 if (B->isVirtual()) // Handled below. 7088 continue; 7089 7090 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7091 ExceptSpec.CalledDecl( 7092 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7093 } 7094 7095 // Virtual base-class destructors. 7096 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7097 BEnd = ClassDecl->vbases_end(); 7098 B != BEnd; ++B) { 7099 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7100 ExceptSpec.CalledDecl( 7101 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7102 } 7103 7104 // Field destructors. 7105 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7106 FEnd = ClassDecl->field_end(); 7107 F != FEnd; ++F) { 7108 if (const RecordType *RecordTy 7109 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7110 ExceptSpec.CalledDecl( 7111 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7112 } 7113 7114 return ExceptSpec; 7115} 7116 7117CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7118 // C++ [class.dtor]p2: 7119 // If a class has no user-declared destructor, a destructor is 7120 // declared implicitly. An implicitly-declared destructor is an 7121 // inline public member of its class. 7122 7123 ImplicitExceptionSpecification Spec = 7124 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7125 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7126 7127 // Create the actual destructor declaration. 7128 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7129 7130 CanQualType ClassType 7131 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7132 SourceLocation ClassLoc = ClassDecl->getLocation(); 7133 DeclarationName Name 7134 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7135 DeclarationNameInfo NameInfo(Name, ClassLoc); 7136 CXXDestructorDecl *Destructor 7137 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7138 /*isInline=*/true, 7139 /*isImplicitlyDeclared=*/true); 7140 Destructor->setAccess(AS_public); 7141 Destructor->setDefaulted(); 7142 Destructor->setImplicit(); 7143 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7144 7145 // Note that we have declared this destructor. 7146 ++ASTContext::NumImplicitDestructorsDeclared; 7147 7148 // Introduce this destructor into its scope. 7149 if (Scope *S = getScopeForContext(ClassDecl)) 7150 PushOnScopeChains(Destructor, S, false); 7151 ClassDecl->addDecl(Destructor); 7152 7153 // This could be uniqued if it ever proves significant. 7154 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7155 7156 if (ShouldDeleteDestructor(Destructor)) 7157 Destructor->setDeletedAsWritten(); 7158 7159 AddOverriddenMethods(ClassDecl, Destructor); 7160 7161 return Destructor; 7162} 7163 7164void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7165 CXXDestructorDecl *Destructor) { 7166 assert((Destructor->isDefaulted() && 7167 !Destructor->doesThisDeclarationHaveABody()) && 7168 "DefineImplicitDestructor - call it for implicit default dtor"); 7169 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7170 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7171 7172 if (Destructor->isInvalidDecl()) 7173 return; 7174 7175 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7176 7177 DiagnosticErrorTrap Trap(Diags); 7178 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7179 Destructor->getParent()); 7180 7181 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7182 Diag(CurrentLocation, diag::note_member_synthesized_at) 7183 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7184 7185 Destructor->setInvalidDecl(); 7186 return; 7187 } 7188 7189 SourceLocation Loc = Destructor->getLocation(); 7190 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7191 Destructor->setImplicitlyDefined(true); 7192 Destructor->setUsed(); 7193 MarkVTableUsed(CurrentLocation, ClassDecl); 7194 7195 if (ASTMutationListener *L = getASTMutationListener()) { 7196 L->CompletedImplicitDefinition(Destructor); 7197 } 7198} 7199 7200void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7201 CXXDestructorDecl *destructor) { 7202 // C++11 [class.dtor]p3: 7203 // A declaration of a destructor that does not have an exception- 7204 // specification is implicitly considered to have the same exception- 7205 // specification as an implicit declaration. 7206 const FunctionProtoType *dtorType = destructor->getType()-> 7207 getAs<FunctionProtoType>(); 7208 if (dtorType->hasExceptionSpec()) 7209 return; 7210 7211 ImplicitExceptionSpecification exceptSpec = 7212 ComputeDefaultedDtorExceptionSpec(classDecl); 7213 7214 // Replace the destructor's type, building off the existing one. Fortunately, 7215 // the only thing of interest in the destructor type is its extended info. 7216 // The return and arguments are fixed. 7217 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7218 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7219 epi.NumExceptions = exceptSpec.size(); 7220 epi.Exceptions = exceptSpec.data(); 7221 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7222 7223 destructor->setType(ty); 7224 7225 // FIXME: If the destructor has a body that could throw, and the newly created 7226 // spec doesn't allow exceptions, we should emit a warning, because this 7227 // change in behavior can break conforming C++03 programs at runtime. 7228 // However, we don't have a body yet, so it needs to be done somewhere else. 7229} 7230 7231/// \brief Builds a statement that copies/moves the given entity from \p From to 7232/// \c To. 7233/// 7234/// This routine is used to copy/move the members of a class with an 7235/// implicitly-declared copy/move assignment operator. When the entities being 7236/// copied are arrays, this routine builds for loops to copy them. 7237/// 7238/// \param S The Sema object used for type-checking. 7239/// 7240/// \param Loc The location where the implicit copy/move is being generated. 7241/// 7242/// \param T The type of the expressions being copied/moved. Both expressions 7243/// must have this type. 7244/// 7245/// \param To The expression we are copying/moving to. 7246/// 7247/// \param From The expression we are copying/moving from. 7248/// 7249/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7250/// Otherwise, it's a non-static member subobject. 7251/// 7252/// \param Copying Whether we're copying or moving. 7253/// 7254/// \param Depth Internal parameter recording the depth of the recursion. 7255/// 7256/// \returns A statement or a loop that copies the expressions. 7257static StmtResult 7258BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7259 Expr *To, Expr *From, 7260 bool CopyingBaseSubobject, bool Copying, 7261 unsigned Depth = 0) { 7262 // C++0x [class.copy]p28: 7263 // Each subobject is assigned in the manner appropriate to its type: 7264 // 7265 // - if the subobject is of class type, as if by a call to operator= with 7266 // the subobject as the object expression and the corresponding 7267 // subobject of x as a single function argument (as if by explicit 7268 // qualification; that is, ignoring any possible virtual overriding 7269 // functions in more derived classes); 7270 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7271 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7272 7273 // Look for operator=. 7274 DeclarationName Name 7275 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7276 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7277 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7278 7279 // Filter out any result that isn't a copy/move-assignment operator. 7280 LookupResult::Filter F = OpLookup.makeFilter(); 7281 while (F.hasNext()) { 7282 NamedDecl *D = F.next(); 7283 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7284 if (Copying ? Method->isCopyAssignmentOperator() : 7285 Method->isMoveAssignmentOperator()) 7286 continue; 7287 7288 F.erase(); 7289 } 7290 F.done(); 7291 7292 // Suppress the protected check (C++ [class.protected]) for each of the 7293 // assignment operators we found. This strange dance is required when 7294 // we're assigning via a base classes's copy-assignment operator. To 7295 // ensure that we're getting the right base class subobject (without 7296 // ambiguities), we need to cast "this" to that subobject type; to 7297 // ensure that we don't go through the virtual call mechanism, we need 7298 // to qualify the operator= name with the base class (see below). However, 7299 // this means that if the base class has a protected copy assignment 7300 // operator, the protected member access check will fail. So, we 7301 // rewrite "protected" access to "public" access in this case, since we 7302 // know by construction that we're calling from a derived class. 7303 if (CopyingBaseSubobject) { 7304 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7305 L != LEnd; ++L) { 7306 if (L.getAccess() == AS_protected) 7307 L.setAccess(AS_public); 7308 } 7309 } 7310 7311 // Create the nested-name-specifier that will be used to qualify the 7312 // reference to operator=; this is required to suppress the virtual 7313 // call mechanism. 7314 CXXScopeSpec SS; 7315 SS.MakeTrivial(S.Context, 7316 NestedNameSpecifier::Create(S.Context, 0, false, 7317 T.getTypePtr()), 7318 Loc); 7319 7320 // Create the reference to operator=. 7321 ExprResult OpEqualRef 7322 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7323 /*FirstQualifierInScope=*/0, OpLookup, 7324 /*TemplateArgs=*/0, 7325 /*SuppressQualifierCheck=*/true); 7326 if (OpEqualRef.isInvalid()) 7327 return StmtError(); 7328 7329 // Build the call to the assignment operator. 7330 7331 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7332 OpEqualRef.takeAs<Expr>(), 7333 Loc, &From, 1, Loc); 7334 if (Call.isInvalid()) 7335 return StmtError(); 7336 7337 return S.Owned(Call.takeAs<Stmt>()); 7338 } 7339 7340 // - if the subobject is of scalar type, the built-in assignment 7341 // operator is used. 7342 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7343 if (!ArrayTy) { 7344 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7345 if (Assignment.isInvalid()) 7346 return StmtError(); 7347 7348 return S.Owned(Assignment.takeAs<Stmt>()); 7349 } 7350 7351 // - if the subobject is an array, each element is assigned, in the 7352 // manner appropriate to the element type; 7353 7354 // Construct a loop over the array bounds, e.g., 7355 // 7356 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7357 // 7358 // that will copy each of the array elements. 7359 QualType SizeType = S.Context.getSizeType(); 7360 7361 // Create the iteration variable. 7362 IdentifierInfo *IterationVarName = 0; 7363 { 7364 llvm::SmallString<8> Str; 7365 llvm::raw_svector_ostream OS(Str); 7366 OS << "__i" << Depth; 7367 IterationVarName = &S.Context.Idents.get(OS.str()); 7368 } 7369 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7370 IterationVarName, SizeType, 7371 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7372 SC_None, SC_None); 7373 7374 // Initialize the iteration variable to zero. 7375 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7376 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7377 7378 // Create a reference to the iteration variable; we'll use this several 7379 // times throughout. 7380 Expr *IterationVarRef 7381 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7382 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7383 7384 // Create the DeclStmt that holds the iteration variable. 7385 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7386 7387 // Create the comparison against the array bound. 7388 llvm::APInt Upper 7389 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7390 Expr *Comparison 7391 = new (S.Context) BinaryOperator(IterationVarRef, 7392 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7393 BO_NE, S.Context.BoolTy, 7394 VK_RValue, OK_Ordinary, Loc); 7395 7396 // Create the pre-increment of the iteration variable. 7397 Expr *Increment 7398 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7399 VK_LValue, OK_Ordinary, Loc); 7400 7401 // Subscript the "from" and "to" expressions with the iteration variable. 7402 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7403 IterationVarRef, Loc)); 7404 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7405 IterationVarRef, Loc)); 7406 if (!Copying) // Cast to rvalue 7407 From = CastForMoving(S, From); 7408 7409 // Build the copy/move for an individual element of the array. 7410 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7411 To, From, CopyingBaseSubobject, 7412 Copying, Depth + 1); 7413 if (Copy.isInvalid()) 7414 return StmtError(); 7415 7416 // Construct the loop that copies all elements of this array. 7417 return S.ActOnForStmt(Loc, Loc, InitStmt, 7418 S.MakeFullExpr(Comparison), 7419 0, S.MakeFullExpr(Increment), 7420 Loc, Copy.take()); 7421} 7422 7423std::pair<Sema::ImplicitExceptionSpecification, bool> 7424Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7425 CXXRecordDecl *ClassDecl) { 7426 if (ClassDecl->isInvalidDecl()) 7427 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7428 7429 // C++ [class.copy]p10: 7430 // If the class definition does not explicitly declare a copy 7431 // assignment operator, one is declared implicitly. 7432 // The implicitly-defined copy assignment operator for a class X 7433 // will have the form 7434 // 7435 // X& X::operator=(const X&) 7436 // 7437 // if 7438 bool HasConstCopyAssignment = true; 7439 7440 // -- each direct base class B of X has a copy assignment operator 7441 // whose parameter is of type const B&, const volatile B& or B, 7442 // and 7443 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7444 BaseEnd = ClassDecl->bases_end(); 7445 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7446 // We'll handle this below 7447 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7448 continue; 7449 7450 assert(!Base->getType()->isDependentType() && 7451 "Cannot generate implicit members for class with dependent bases."); 7452 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7453 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7454 &HasConstCopyAssignment); 7455 } 7456 7457 // In C++11, the above citation has "or virtual" added 7458 if (LangOpts.CPlusPlus0x) { 7459 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7460 BaseEnd = ClassDecl->vbases_end(); 7461 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7462 assert(!Base->getType()->isDependentType() && 7463 "Cannot generate implicit members for class with dependent bases."); 7464 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7465 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7466 &HasConstCopyAssignment); 7467 } 7468 } 7469 7470 // -- for all the nonstatic data members of X that are of a class 7471 // type M (or array thereof), each such class type has a copy 7472 // assignment operator whose parameter is of type const M&, 7473 // const volatile M& or M. 7474 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7475 FieldEnd = ClassDecl->field_end(); 7476 HasConstCopyAssignment && Field != FieldEnd; 7477 ++Field) { 7478 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7479 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7480 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7481 &HasConstCopyAssignment); 7482 } 7483 } 7484 7485 // Otherwise, the implicitly declared copy assignment operator will 7486 // have the form 7487 // 7488 // X& X::operator=(X&) 7489 7490 // C++ [except.spec]p14: 7491 // An implicitly declared special member function (Clause 12) shall have an 7492 // exception-specification. [...] 7493 7494 // It is unspecified whether or not an implicit copy assignment operator 7495 // attempts to deduplicate calls to assignment operators of virtual bases are 7496 // made. As such, this exception specification is effectively unspecified. 7497 // Based on a similar decision made for constness in C++0x, we're erring on 7498 // the side of assuming such calls to be made regardless of whether they 7499 // actually happen. 7500 ImplicitExceptionSpecification ExceptSpec(Context); 7501 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7502 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7503 BaseEnd = ClassDecl->bases_end(); 7504 Base != BaseEnd; ++Base) { 7505 if (Base->isVirtual()) 7506 continue; 7507 7508 CXXRecordDecl *BaseClassDecl 7509 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7510 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7511 ArgQuals, false, 0)) 7512 ExceptSpec.CalledDecl(CopyAssign); 7513 } 7514 7515 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7516 BaseEnd = ClassDecl->vbases_end(); 7517 Base != BaseEnd; ++Base) { 7518 CXXRecordDecl *BaseClassDecl 7519 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7520 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7521 ArgQuals, false, 0)) 7522 ExceptSpec.CalledDecl(CopyAssign); 7523 } 7524 7525 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7526 FieldEnd = ClassDecl->field_end(); 7527 Field != FieldEnd; 7528 ++Field) { 7529 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7530 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7531 if (CXXMethodDecl *CopyAssign = 7532 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7533 ExceptSpec.CalledDecl(CopyAssign); 7534 } 7535 } 7536 7537 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7538} 7539 7540CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7541 // Note: The following rules are largely analoguous to the copy 7542 // constructor rules. Note that virtual bases are not taken into account 7543 // for determining the argument type of the operator. Note also that 7544 // operators taking an object instead of a reference are allowed. 7545 7546 ImplicitExceptionSpecification Spec(Context); 7547 bool Const; 7548 llvm::tie(Spec, Const) = 7549 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7550 7551 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7552 QualType RetType = Context.getLValueReferenceType(ArgType); 7553 if (Const) 7554 ArgType = ArgType.withConst(); 7555 ArgType = Context.getLValueReferenceType(ArgType); 7556 7557 // An implicitly-declared copy assignment operator is an inline public 7558 // member of its class. 7559 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7560 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7561 SourceLocation ClassLoc = ClassDecl->getLocation(); 7562 DeclarationNameInfo NameInfo(Name, ClassLoc); 7563 CXXMethodDecl *CopyAssignment 7564 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7565 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7566 /*TInfo=*/0, /*isStatic=*/false, 7567 /*StorageClassAsWritten=*/SC_None, 7568 /*isInline=*/true, /*isConstexpr=*/false, 7569 SourceLocation()); 7570 CopyAssignment->setAccess(AS_public); 7571 CopyAssignment->setDefaulted(); 7572 CopyAssignment->setImplicit(); 7573 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7574 7575 // Add the parameter to the operator. 7576 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7577 ClassLoc, ClassLoc, /*Id=*/0, 7578 ArgType, /*TInfo=*/0, 7579 SC_None, 7580 SC_None, 0); 7581 CopyAssignment->setParams(FromParam); 7582 7583 // Note that we have added this copy-assignment operator. 7584 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7585 7586 if (Scope *S = getScopeForContext(ClassDecl)) 7587 PushOnScopeChains(CopyAssignment, S, false); 7588 ClassDecl->addDecl(CopyAssignment); 7589 7590 // C++0x [class.copy]p18: 7591 // ... If the class definition declares a move constructor or move 7592 // assignment operator, the implicitly declared copy assignment operator is 7593 // defined as deleted; ... 7594 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7595 ClassDecl->hasUserDeclaredMoveAssignment() || 7596 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7597 CopyAssignment->setDeletedAsWritten(); 7598 7599 AddOverriddenMethods(ClassDecl, CopyAssignment); 7600 return CopyAssignment; 7601} 7602 7603void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7604 CXXMethodDecl *CopyAssignOperator) { 7605 assert((CopyAssignOperator->isDefaulted() && 7606 CopyAssignOperator->isOverloadedOperator() && 7607 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7608 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7609 "DefineImplicitCopyAssignment called for wrong function"); 7610 7611 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7612 7613 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7614 CopyAssignOperator->setInvalidDecl(); 7615 return; 7616 } 7617 7618 CopyAssignOperator->setUsed(); 7619 7620 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7621 DiagnosticErrorTrap Trap(Diags); 7622 7623 // C++0x [class.copy]p30: 7624 // The implicitly-defined or explicitly-defaulted copy assignment operator 7625 // for a non-union class X performs memberwise copy assignment of its 7626 // subobjects. The direct base classes of X are assigned first, in the 7627 // order of their declaration in the base-specifier-list, and then the 7628 // immediate non-static data members of X are assigned, in the order in 7629 // which they were declared in the class definition. 7630 7631 // The statements that form the synthesized function body. 7632 ASTOwningVector<Stmt*> Statements(*this); 7633 7634 // The parameter for the "other" object, which we are copying from. 7635 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7636 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7637 QualType OtherRefType = Other->getType(); 7638 if (const LValueReferenceType *OtherRef 7639 = OtherRefType->getAs<LValueReferenceType>()) { 7640 OtherRefType = OtherRef->getPointeeType(); 7641 OtherQuals = OtherRefType.getQualifiers(); 7642 } 7643 7644 // Our location for everything implicitly-generated. 7645 SourceLocation Loc = CopyAssignOperator->getLocation(); 7646 7647 // Construct a reference to the "other" object. We'll be using this 7648 // throughout the generated ASTs. 7649 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7650 assert(OtherRef && "Reference to parameter cannot fail!"); 7651 7652 // Construct the "this" pointer. We'll be using this throughout the generated 7653 // ASTs. 7654 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7655 assert(This && "Reference to this cannot fail!"); 7656 7657 // Assign base classes. 7658 bool Invalid = false; 7659 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7660 E = ClassDecl->bases_end(); Base != E; ++Base) { 7661 // Form the assignment: 7662 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7663 QualType BaseType = Base->getType().getUnqualifiedType(); 7664 if (!BaseType->isRecordType()) { 7665 Invalid = true; 7666 continue; 7667 } 7668 7669 CXXCastPath BasePath; 7670 BasePath.push_back(Base); 7671 7672 // Construct the "from" expression, which is an implicit cast to the 7673 // appropriately-qualified base type. 7674 Expr *From = OtherRef; 7675 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7676 CK_UncheckedDerivedToBase, 7677 VK_LValue, &BasePath).take(); 7678 7679 // Dereference "this". 7680 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7681 7682 // Implicitly cast "this" to the appropriately-qualified base type. 7683 To = ImpCastExprToType(To.take(), 7684 Context.getCVRQualifiedType(BaseType, 7685 CopyAssignOperator->getTypeQualifiers()), 7686 CK_UncheckedDerivedToBase, 7687 VK_LValue, &BasePath); 7688 7689 // Build the copy. 7690 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7691 To.get(), From, 7692 /*CopyingBaseSubobject=*/true, 7693 /*Copying=*/true); 7694 if (Copy.isInvalid()) { 7695 Diag(CurrentLocation, diag::note_member_synthesized_at) 7696 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7697 CopyAssignOperator->setInvalidDecl(); 7698 return; 7699 } 7700 7701 // Success! Record the copy. 7702 Statements.push_back(Copy.takeAs<Expr>()); 7703 } 7704 7705 // \brief Reference to the __builtin_memcpy function. 7706 Expr *BuiltinMemCpyRef = 0; 7707 // \brief Reference to the __builtin_objc_memmove_collectable function. 7708 Expr *CollectableMemCpyRef = 0; 7709 7710 // Assign non-static members. 7711 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7712 FieldEnd = ClassDecl->field_end(); 7713 Field != FieldEnd; ++Field) { 7714 if (Field->isUnnamedBitfield()) 7715 continue; 7716 7717 // Check for members of reference type; we can't copy those. 7718 if (Field->getType()->isReferenceType()) { 7719 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7720 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7721 Diag(Field->getLocation(), diag::note_declared_at); 7722 Diag(CurrentLocation, diag::note_member_synthesized_at) 7723 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7724 Invalid = true; 7725 continue; 7726 } 7727 7728 // Check for members of const-qualified, non-class type. 7729 QualType BaseType = Context.getBaseElementType(Field->getType()); 7730 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7731 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7732 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7733 Diag(Field->getLocation(), diag::note_declared_at); 7734 Diag(CurrentLocation, diag::note_member_synthesized_at) 7735 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7736 Invalid = true; 7737 continue; 7738 } 7739 7740 // Suppress assigning zero-width bitfields. 7741 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7742 continue; 7743 7744 QualType FieldType = Field->getType().getNonReferenceType(); 7745 if (FieldType->isIncompleteArrayType()) { 7746 assert(ClassDecl->hasFlexibleArrayMember() && 7747 "Incomplete array type is not valid"); 7748 continue; 7749 } 7750 7751 // Build references to the field in the object we're copying from and to. 7752 CXXScopeSpec SS; // Intentionally empty 7753 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7754 LookupMemberName); 7755 MemberLookup.addDecl(*Field); 7756 MemberLookup.resolveKind(); 7757 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7758 Loc, /*IsArrow=*/false, 7759 SS, 0, MemberLookup, 0); 7760 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7761 Loc, /*IsArrow=*/true, 7762 SS, 0, MemberLookup, 0); 7763 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7764 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7765 7766 // If the field should be copied with __builtin_memcpy rather than via 7767 // explicit assignments, do so. This optimization only applies for arrays 7768 // of scalars and arrays of class type with trivial copy-assignment 7769 // operators. 7770 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7771 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7772 // Compute the size of the memory buffer to be copied. 7773 QualType SizeType = Context.getSizeType(); 7774 llvm::APInt Size(Context.getTypeSize(SizeType), 7775 Context.getTypeSizeInChars(BaseType).getQuantity()); 7776 for (const ConstantArrayType *Array 7777 = Context.getAsConstantArrayType(FieldType); 7778 Array; 7779 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7780 llvm::APInt ArraySize 7781 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7782 Size *= ArraySize; 7783 } 7784 7785 // Take the address of the field references for "from" and "to". 7786 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7787 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7788 7789 bool NeedsCollectableMemCpy = 7790 (BaseType->isRecordType() && 7791 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7792 7793 if (NeedsCollectableMemCpy) { 7794 if (!CollectableMemCpyRef) { 7795 // Create a reference to the __builtin_objc_memmove_collectable function. 7796 LookupResult R(*this, 7797 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7798 Loc, LookupOrdinaryName); 7799 LookupName(R, TUScope, true); 7800 7801 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7802 if (!CollectableMemCpy) { 7803 // Something went horribly wrong earlier, and we will have 7804 // complained about it. 7805 Invalid = true; 7806 continue; 7807 } 7808 7809 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7810 CollectableMemCpy->getType(), 7811 VK_LValue, Loc, 0).take(); 7812 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7813 } 7814 } 7815 // Create a reference to the __builtin_memcpy builtin function. 7816 else if (!BuiltinMemCpyRef) { 7817 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7818 LookupOrdinaryName); 7819 LookupName(R, TUScope, true); 7820 7821 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7822 if (!BuiltinMemCpy) { 7823 // Something went horribly wrong earlier, and we will have complained 7824 // about it. 7825 Invalid = true; 7826 continue; 7827 } 7828 7829 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7830 BuiltinMemCpy->getType(), 7831 VK_LValue, Loc, 0).take(); 7832 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7833 } 7834 7835 ASTOwningVector<Expr*> CallArgs(*this); 7836 CallArgs.push_back(To.takeAs<Expr>()); 7837 CallArgs.push_back(From.takeAs<Expr>()); 7838 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7839 ExprResult Call = ExprError(); 7840 if (NeedsCollectableMemCpy) 7841 Call = ActOnCallExpr(/*Scope=*/0, 7842 CollectableMemCpyRef, 7843 Loc, move_arg(CallArgs), 7844 Loc); 7845 else 7846 Call = ActOnCallExpr(/*Scope=*/0, 7847 BuiltinMemCpyRef, 7848 Loc, move_arg(CallArgs), 7849 Loc); 7850 7851 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7852 Statements.push_back(Call.takeAs<Expr>()); 7853 continue; 7854 } 7855 7856 // Build the copy of this field. 7857 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7858 To.get(), From.get(), 7859 /*CopyingBaseSubobject=*/false, 7860 /*Copying=*/true); 7861 if (Copy.isInvalid()) { 7862 Diag(CurrentLocation, diag::note_member_synthesized_at) 7863 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7864 CopyAssignOperator->setInvalidDecl(); 7865 return; 7866 } 7867 7868 // Success! Record the copy. 7869 Statements.push_back(Copy.takeAs<Stmt>()); 7870 } 7871 7872 if (!Invalid) { 7873 // Add a "return *this;" 7874 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7875 7876 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7877 if (Return.isInvalid()) 7878 Invalid = true; 7879 else { 7880 Statements.push_back(Return.takeAs<Stmt>()); 7881 7882 if (Trap.hasErrorOccurred()) { 7883 Diag(CurrentLocation, diag::note_member_synthesized_at) 7884 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7885 Invalid = true; 7886 } 7887 } 7888 } 7889 7890 if (Invalid) { 7891 CopyAssignOperator->setInvalidDecl(); 7892 return; 7893 } 7894 7895 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7896 /*isStmtExpr=*/false); 7897 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7898 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7899 7900 if (ASTMutationListener *L = getASTMutationListener()) { 7901 L->CompletedImplicitDefinition(CopyAssignOperator); 7902 } 7903} 7904 7905Sema::ImplicitExceptionSpecification 7906Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7907 ImplicitExceptionSpecification ExceptSpec(Context); 7908 7909 if (ClassDecl->isInvalidDecl()) 7910 return ExceptSpec; 7911 7912 // C++0x [except.spec]p14: 7913 // An implicitly declared special member function (Clause 12) shall have an 7914 // exception-specification. [...] 7915 7916 // It is unspecified whether or not an implicit move assignment operator 7917 // attempts to deduplicate calls to assignment operators of virtual bases are 7918 // made. As such, this exception specification is effectively unspecified. 7919 // Based on a similar decision made for constness in C++0x, we're erring on 7920 // the side of assuming such calls to be made regardless of whether they 7921 // actually happen. 7922 // Note that a move constructor is not implicitly declared when there are 7923 // virtual bases, but it can still be user-declared and explicitly defaulted. 7924 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7925 BaseEnd = ClassDecl->bases_end(); 7926 Base != BaseEnd; ++Base) { 7927 if (Base->isVirtual()) 7928 continue; 7929 7930 CXXRecordDecl *BaseClassDecl 7931 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7932 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7933 false, 0)) 7934 ExceptSpec.CalledDecl(MoveAssign); 7935 } 7936 7937 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7938 BaseEnd = ClassDecl->vbases_end(); 7939 Base != BaseEnd; ++Base) { 7940 CXXRecordDecl *BaseClassDecl 7941 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7942 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7943 false, 0)) 7944 ExceptSpec.CalledDecl(MoveAssign); 7945 } 7946 7947 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7948 FieldEnd = ClassDecl->field_end(); 7949 Field != FieldEnd; 7950 ++Field) { 7951 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7952 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7953 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7954 false, 0)) 7955 ExceptSpec.CalledDecl(MoveAssign); 7956 } 7957 } 7958 7959 return ExceptSpec; 7960} 7961 7962CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7963 // Note: The following rules are largely analoguous to the move 7964 // constructor rules. 7965 7966 ImplicitExceptionSpecification Spec( 7967 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7968 7969 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7970 QualType RetType = Context.getLValueReferenceType(ArgType); 7971 ArgType = Context.getRValueReferenceType(ArgType); 7972 7973 // An implicitly-declared move assignment operator is an inline public 7974 // member of its class. 7975 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7976 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7977 SourceLocation ClassLoc = ClassDecl->getLocation(); 7978 DeclarationNameInfo NameInfo(Name, ClassLoc); 7979 CXXMethodDecl *MoveAssignment 7980 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7981 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7982 /*TInfo=*/0, /*isStatic=*/false, 7983 /*StorageClassAsWritten=*/SC_None, 7984 /*isInline=*/true, 7985 /*isConstexpr=*/false, 7986 SourceLocation()); 7987 MoveAssignment->setAccess(AS_public); 7988 MoveAssignment->setDefaulted(); 7989 MoveAssignment->setImplicit(); 7990 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7991 7992 // Add the parameter to the operator. 7993 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7994 ClassLoc, ClassLoc, /*Id=*/0, 7995 ArgType, /*TInfo=*/0, 7996 SC_None, 7997 SC_None, 0); 7998 MoveAssignment->setParams(FromParam); 7999 8000 // Note that we have added this copy-assignment operator. 8001 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8002 8003 // C++0x [class.copy]p9: 8004 // If the definition of a class X does not explicitly declare a move 8005 // assignment operator, one will be implicitly declared as defaulted if and 8006 // only if: 8007 // [...] 8008 // - the move assignment operator would not be implicitly defined as 8009 // deleted. 8010 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8011 // Cache this result so that we don't try to generate this over and over 8012 // on every lookup, leaking memory and wasting time. 8013 ClassDecl->setFailedImplicitMoveAssignment(); 8014 return 0; 8015 } 8016 8017 if (Scope *S = getScopeForContext(ClassDecl)) 8018 PushOnScopeChains(MoveAssignment, S, false); 8019 ClassDecl->addDecl(MoveAssignment); 8020 8021 AddOverriddenMethods(ClassDecl, MoveAssignment); 8022 return MoveAssignment; 8023} 8024 8025void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8026 CXXMethodDecl *MoveAssignOperator) { 8027 assert((MoveAssignOperator->isDefaulted() && 8028 MoveAssignOperator->isOverloadedOperator() && 8029 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8030 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8031 "DefineImplicitMoveAssignment called for wrong function"); 8032 8033 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8034 8035 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8036 MoveAssignOperator->setInvalidDecl(); 8037 return; 8038 } 8039 8040 MoveAssignOperator->setUsed(); 8041 8042 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8043 DiagnosticErrorTrap Trap(Diags); 8044 8045 // C++0x [class.copy]p28: 8046 // The implicitly-defined or move assignment operator for a non-union class 8047 // X performs memberwise move assignment of its subobjects. The direct base 8048 // classes of X are assigned first, in the order of their declaration in the 8049 // base-specifier-list, and then the immediate non-static data members of X 8050 // are assigned, in the order in which they were declared in the class 8051 // definition. 8052 8053 // The statements that form the synthesized function body. 8054 ASTOwningVector<Stmt*> Statements(*this); 8055 8056 // The parameter for the "other" object, which we are move from. 8057 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8058 QualType OtherRefType = Other->getType()-> 8059 getAs<RValueReferenceType>()->getPointeeType(); 8060 assert(OtherRefType.getQualifiers() == 0 && 8061 "Bad argument type of defaulted move assignment"); 8062 8063 // Our location for everything implicitly-generated. 8064 SourceLocation Loc = MoveAssignOperator->getLocation(); 8065 8066 // Construct a reference to the "other" object. We'll be using this 8067 // throughout the generated ASTs. 8068 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8069 assert(OtherRef && "Reference to parameter cannot fail!"); 8070 // Cast to rvalue. 8071 OtherRef = CastForMoving(*this, OtherRef); 8072 8073 // Construct the "this" pointer. We'll be using this throughout the generated 8074 // ASTs. 8075 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8076 assert(This && "Reference to this cannot fail!"); 8077 8078 // Assign base classes. 8079 bool Invalid = false; 8080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8081 E = ClassDecl->bases_end(); Base != E; ++Base) { 8082 // Form the assignment: 8083 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8084 QualType BaseType = Base->getType().getUnqualifiedType(); 8085 if (!BaseType->isRecordType()) { 8086 Invalid = true; 8087 continue; 8088 } 8089 8090 CXXCastPath BasePath; 8091 BasePath.push_back(Base); 8092 8093 // Construct the "from" expression, which is an implicit cast to the 8094 // appropriately-qualified base type. 8095 Expr *From = OtherRef; 8096 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8097 VK_XValue, &BasePath).take(); 8098 8099 // Dereference "this". 8100 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8101 8102 // Implicitly cast "this" to the appropriately-qualified base type. 8103 To = ImpCastExprToType(To.take(), 8104 Context.getCVRQualifiedType(BaseType, 8105 MoveAssignOperator->getTypeQualifiers()), 8106 CK_UncheckedDerivedToBase, 8107 VK_LValue, &BasePath); 8108 8109 // Build the move. 8110 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8111 To.get(), From, 8112 /*CopyingBaseSubobject=*/true, 8113 /*Copying=*/false); 8114 if (Move.isInvalid()) { 8115 Diag(CurrentLocation, diag::note_member_synthesized_at) 8116 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8117 MoveAssignOperator->setInvalidDecl(); 8118 return; 8119 } 8120 8121 // Success! Record the move. 8122 Statements.push_back(Move.takeAs<Expr>()); 8123 } 8124 8125 // \brief Reference to the __builtin_memcpy function. 8126 Expr *BuiltinMemCpyRef = 0; 8127 // \brief Reference to the __builtin_objc_memmove_collectable function. 8128 Expr *CollectableMemCpyRef = 0; 8129 8130 // Assign non-static members. 8131 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8132 FieldEnd = ClassDecl->field_end(); 8133 Field != FieldEnd; ++Field) { 8134 if (Field->isUnnamedBitfield()) 8135 continue; 8136 8137 // Check for members of reference type; we can't move those. 8138 if (Field->getType()->isReferenceType()) { 8139 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8140 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8141 Diag(Field->getLocation(), diag::note_declared_at); 8142 Diag(CurrentLocation, diag::note_member_synthesized_at) 8143 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8144 Invalid = true; 8145 continue; 8146 } 8147 8148 // Check for members of const-qualified, non-class type. 8149 QualType BaseType = Context.getBaseElementType(Field->getType()); 8150 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8151 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8152 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8153 Diag(Field->getLocation(), diag::note_declared_at); 8154 Diag(CurrentLocation, diag::note_member_synthesized_at) 8155 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8156 Invalid = true; 8157 continue; 8158 } 8159 8160 // Suppress assigning zero-width bitfields. 8161 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8162 continue; 8163 8164 QualType FieldType = Field->getType().getNonReferenceType(); 8165 if (FieldType->isIncompleteArrayType()) { 8166 assert(ClassDecl->hasFlexibleArrayMember() && 8167 "Incomplete array type is not valid"); 8168 continue; 8169 } 8170 8171 // Build references to the field in the object we're copying from and to. 8172 CXXScopeSpec SS; // Intentionally empty 8173 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8174 LookupMemberName); 8175 MemberLookup.addDecl(*Field); 8176 MemberLookup.resolveKind(); 8177 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8178 Loc, /*IsArrow=*/false, 8179 SS, 0, MemberLookup, 0); 8180 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8181 Loc, /*IsArrow=*/true, 8182 SS, 0, MemberLookup, 0); 8183 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8184 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8185 8186 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8187 "Member reference with rvalue base must be rvalue except for reference " 8188 "members, which aren't allowed for move assignment."); 8189 8190 // If the field should be copied with __builtin_memcpy rather than via 8191 // explicit assignments, do so. This optimization only applies for arrays 8192 // of scalars and arrays of class type with trivial move-assignment 8193 // operators. 8194 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8195 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8196 // Compute the size of the memory buffer to be copied. 8197 QualType SizeType = Context.getSizeType(); 8198 llvm::APInt Size(Context.getTypeSize(SizeType), 8199 Context.getTypeSizeInChars(BaseType).getQuantity()); 8200 for (const ConstantArrayType *Array 8201 = Context.getAsConstantArrayType(FieldType); 8202 Array; 8203 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8204 llvm::APInt ArraySize 8205 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8206 Size *= ArraySize; 8207 } 8208 8209 // Take the address of the field references for "from" and "to". We 8210 // directly construct UnaryOperators here because semantic analysis 8211 // does not permit us to take the address of an xvalue. 8212 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8213 Context.getPointerType(From.get()->getType()), 8214 VK_RValue, OK_Ordinary, Loc); 8215 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8216 Context.getPointerType(To.get()->getType()), 8217 VK_RValue, OK_Ordinary, Loc); 8218 8219 bool NeedsCollectableMemCpy = 8220 (BaseType->isRecordType() && 8221 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8222 8223 if (NeedsCollectableMemCpy) { 8224 if (!CollectableMemCpyRef) { 8225 // Create a reference to the __builtin_objc_memmove_collectable function. 8226 LookupResult R(*this, 8227 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8228 Loc, LookupOrdinaryName); 8229 LookupName(R, TUScope, true); 8230 8231 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8232 if (!CollectableMemCpy) { 8233 // Something went horribly wrong earlier, and we will have 8234 // complained about it. 8235 Invalid = true; 8236 continue; 8237 } 8238 8239 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8240 CollectableMemCpy->getType(), 8241 VK_LValue, Loc, 0).take(); 8242 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8243 } 8244 } 8245 // Create a reference to the __builtin_memcpy builtin function. 8246 else if (!BuiltinMemCpyRef) { 8247 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8248 LookupOrdinaryName); 8249 LookupName(R, TUScope, true); 8250 8251 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8252 if (!BuiltinMemCpy) { 8253 // Something went horribly wrong earlier, and we will have complained 8254 // about it. 8255 Invalid = true; 8256 continue; 8257 } 8258 8259 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8260 BuiltinMemCpy->getType(), 8261 VK_LValue, Loc, 0).take(); 8262 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8263 } 8264 8265 ASTOwningVector<Expr*> CallArgs(*this); 8266 CallArgs.push_back(To.takeAs<Expr>()); 8267 CallArgs.push_back(From.takeAs<Expr>()); 8268 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8269 ExprResult Call = ExprError(); 8270 if (NeedsCollectableMemCpy) 8271 Call = ActOnCallExpr(/*Scope=*/0, 8272 CollectableMemCpyRef, 8273 Loc, move_arg(CallArgs), 8274 Loc); 8275 else 8276 Call = ActOnCallExpr(/*Scope=*/0, 8277 BuiltinMemCpyRef, 8278 Loc, move_arg(CallArgs), 8279 Loc); 8280 8281 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8282 Statements.push_back(Call.takeAs<Expr>()); 8283 continue; 8284 } 8285 8286 // Build the move of this field. 8287 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8288 To.get(), From.get(), 8289 /*CopyingBaseSubobject=*/false, 8290 /*Copying=*/false); 8291 if (Move.isInvalid()) { 8292 Diag(CurrentLocation, diag::note_member_synthesized_at) 8293 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8294 MoveAssignOperator->setInvalidDecl(); 8295 return; 8296 } 8297 8298 // Success! Record the copy. 8299 Statements.push_back(Move.takeAs<Stmt>()); 8300 } 8301 8302 if (!Invalid) { 8303 // Add a "return *this;" 8304 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8305 8306 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8307 if (Return.isInvalid()) 8308 Invalid = true; 8309 else { 8310 Statements.push_back(Return.takeAs<Stmt>()); 8311 8312 if (Trap.hasErrorOccurred()) { 8313 Diag(CurrentLocation, diag::note_member_synthesized_at) 8314 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8315 Invalid = true; 8316 } 8317 } 8318 } 8319 8320 if (Invalid) { 8321 MoveAssignOperator->setInvalidDecl(); 8322 return; 8323 } 8324 8325 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8326 /*isStmtExpr=*/false); 8327 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8328 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8329 8330 if (ASTMutationListener *L = getASTMutationListener()) { 8331 L->CompletedImplicitDefinition(MoveAssignOperator); 8332 } 8333} 8334 8335std::pair<Sema::ImplicitExceptionSpecification, bool> 8336Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8337 if (ClassDecl->isInvalidDecl()) 8338 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8339 8340 // C++ [class.copy]p5: 8341 // The implicitly-declared copy constructor for a class X will 8342 // have the form 8343 // 8344 // X::X(const X&) 8345 // 8346 // if 8347 // FIXME: It ought to be possible to store this on the record. 8348 bool HasConstCopyConstructor = true; 8349 8350 // -- each direct or virtual base class B of X has a copy 8351 // constructor whose first parameter is of type const B& or 8352 // const volatile B&, and 8353 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8354 BaseEnd = ClassDecl->bases_end(); 8355 HasConstCopyConstructor && Base != BaseEnd; 8356 ++Base) { 8357 // Virtual bases are handled below. 8358 if (Base->isVirtual()) 8359 continue; 8360 8361 CXXRecordDecl *BaseClassDecl 8362 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8363 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8364 &HasConstCopyConstructor); 8365 } 8366 8367 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8368 BaseEnd = ClassDecl->vbases_end(); 8369 HasConstCopyConstructor && Base != BaseEnd; 8370 ++Base) { 8371 CXXRecordDecl *BaseClassDecl 8372 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8373 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8374 &HasConstCopyConstructor); 8375 } 8376 8377 // -- for all the nonstatic data members of X that are of a 8378 // class type M (or array thereof), each such class type 8379 // has a copy constructor whose first parameter is of type 8380 // const M& or const volatile M&. 8381 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8382 FieldEnd = ClassDecl->field_end(); 8383 HasConstCopyConstructor && Field != FieldEnd; 8384 ++Field) { 8385 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8386 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8387 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8388 &HasConstCopyConstructor); 8389 } 8390 } 8391 // Otherwise, the implicitly declared copy constructor will have 8392 // the form 8393 // 8394 // X::X(X&) 8395 8396 // C++ [except.spec]p14: 8397 // An implicitly declared special member function (Clause 12) shall have an 8398 // exception-specification. [...] 8399 ImplicitExceptionSpecification ExceptSpec(Context); 8400 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8401 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8402 BaseEnd = ClassDecl->bases_end(); 8403 Base != BaseEnd; 8404 ++Base) { 8405 // Virtual bases are handled below. 8406 if (Base->isVirtual()) 8407 continue; 8408 8409 CXXRecordDecl *BaseClassDecl 8410 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8411 if (CXXConstructorDecl *CopyConstructor = 8412 LookupCopyingConstructor(BaseClassDecl, Quals)) 8413 ExceptSpec.CalledDecl(CopyConstructor); 8414 } 8415 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8416 BaseEnd = ClassDecl->vbases_end(); 8417 Base != BaseEnd; 8418 ++Base) { 8419 CXXRecordDecl *BaseClassDecl 8420 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8421 if (CXXConstructorDecl *CopyConstructor = 8422 LookupCopyingConstructor(BaseClassDecl, Quals)) 8423 ExceptSpec.CalledDecl(CopyConstructor); 8424 } 8425 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8426 FieldEnd = ClassDecl->field_end(); 8427 Field != FieldEnd; 8428 ++Field) { 8429 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8430 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8431 if (CXXConstructorDecl *CopyConstructor = 8432 LookupCopyingConstructor(FieldClassDecl, Quals)) 8433 ExceptSpec.CalledDecl(CopyConstructor); 8434 } 8435 } 8436 8437 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8438} 8439 8440CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8441 CXXRecordDecl *ClassDecl) { 8442 // C++ [class.copy]p4: 8443 // If the class definition does not explicitly declare a copy 8444 // constructor, one is declared implicitly. 8445 8446 ImplicitExceptionSpecification Spec(Context); 8447 bool Const; 8448 llvm::tie(Spec, Const) = 8449 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8450 8451 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8452 QualType ArgType = ClassType; 8453 if (Const) 8454 ArgType = ArgType.withConst(); 8455 ArgType = Context.getLValueReferenceType(ArgType); 8456 8457 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8458 8459 DeclarationName Name 8460 = Context.DeclarationNames.getCXXConstructorName( 8461 Context.getCanonicalType(ClassType)); 8462 SourceLocation ClassLoc = ClassDecl->getLocation(); 8463 DeclarationNameInfo NameInfo(Name, ClassLoc); 8464 8465 // An implicitly-declared copy constructor is an inline public 8466 // member of its class. 8467 CXXConstructorDecl *CopyConstructor 8468 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8469 Context.getFunctionType(Context.VoidTy, 8470 &ArgType, 1, EPI), 8471 /*TInfo=*/0, 8472 /*isExplicit=*/false, 8473 /*isInline=*/true, 8474 /*isImplicitlyDeclared=*/true, 8475 // FIXME: apply the rules for definitions here 8476 /*isConstexpr=*/false); 8477 CopyConstructor->setAccess(AS_public); 8478 CopyConstructor->setDefaulted(); 8479 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8480 8481 // Note that we have declared this constructor. 8482 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8483 8484 // Add the parameter to the constructor. 8485 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8486 ClassLoc, ClassLoc, 8487 /*IdentifierInfo=*/0, 8488 ArgType, /*TInfo=*/0, 8489 SC_None, 8490 SC_None, 0); 8491 CopyConstructor->setParams(FromParam); 8492 8493 if (Scope *S = getScopeForContext(ClassDecl)) 8494 PushOnScopeChains(CopyConstructor, S, false); 8495 ClassDecl->addDecl(CopyConstructor); 8496 8497 // C++0x [class.copy]p7: 8498 // ... If the class definition declares a move constructor or move 8499 // assignment operator, the implicitly declared constructor is defined as 8500 // deleted; ... 8501 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8502 ClassDecl->hasUserDeclaredMoveAssignment() || 8503 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8504 CopyConstructor->setDeletedAsWritten(); 8505 8506 return CopyConstructor; 8507} 8508 8509void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8510 CXXConstructorDecl *CopyConstructor) { 8511 assert((CopyConstructor->isDefaulted() && 8512 CopyConstructor->isCopyConstructor() && 8513 !CopyConstructor->doesThisDeclarationHaveABody()) && 8514 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8515 8516 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8517 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8518 8519 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8520 DiagnosticErrorTrap Trap(Diags); 8521 8522 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8523 Trap.hasErrorOccurred()) { 8524 Diag(CurrentLocation, diag::note_member_synthesized_at) 8525 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8526 CopyConstructor->setInvalidDecl(); 8527 } else { 8528 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8529 CopyConstructor->getLocation(), 8530 MultiStmtArg(*this, 0, 0), 8531 /*isStmtExpr=*/false) 8532 .takeAs<Stmt>()); 8533 CopyConstructor->setImplicitlyDefined(true); 8534 } 8535 8536 CopyConstructor->setUsed(); 8537 if (ASTMutationListener *L = getASTMutationListener()) { 8538 L->CompletedImplicitDefinition(CopyConstructor); 8539 } 8540} 8541 8542Sema::ImplicitExceptionSpecification 8543Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8544 // C++ [except.spec]p14: 8545 // An implicitly declared special member function (Clause 12) shall have an 8546 // exception-specification. [...] 8547 ImplicitExceptionSpecification ExceptSpec(Context); 8548 if (ClassDecl->isInvalidDecl()) 8549 return ExceptSpec; 8550 8551 // Direct base-class constructors. 8552 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8553 BEnd = ClassDecl->bases_end(); 8554 B != BEnd; ++B) { 8555 if (B->isVirtual()) // Handled below. 8556 continue; 8557 8558 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8559 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8560 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8561 // If this is a deleted function, add it anyway. This might be conformant 8562 // with the standard. This might not. I'm not sure. It might not matter. 8563 if (Constructor) 8564 ExceptSpec.CalledDecl(Constructor); 8565 } 8566 } 8567 8568 // Virtual base-class constructors. 8569 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8570 BEnd = ClassDecl->vbases_end(); 8571 B != BEnd; ++B) { 8572 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8573 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8574 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8575 // If this is a deleted function, add it anyway. This might be conformant 8576 // with the standard. This might not. I'm not sure. It might not matter. 8577 if (Constructor) 8578 ExceptSpec.CalledDecl(Constructor); 8579 } 8580 } 8581 8582 // Field constructors. 8583 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8584 FEnd = ClassDecl->field_end(); 8585 F != FEnd; ++F) { 8586 if (F->hasInClassInitializer()) { 8587 if (Expr *E = F->getInClassInitializer()) 8588 ExceptSpec.CalledExpr(E); 8589 else if (!F->isInvalidDecl()) 8590 ExceptSpec.SetDelayed(); 8591 } else if (const RecordType *RecordTy 8592 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8593 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8594 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8595 // If this is a deleted function, add it anyway. This might be conformant 8596 // with the standard. This might not. I'm not sure. It might not matter. 8597 // In particular, the problem is that this function never gets called. It 8598 // might just be ill-formed because this function attempts to refer to 8599 // a deleted function here. 8600 if (Constructor) 8601 ExceptSpec.CalledDecl(Constructor); 8602 } 8603 } 8604 8605 return ExceptSpec; 8606} 8607 8608CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8609 CXXRecordDecl *ClassDecl) { 8610 ImplicitExceptionSpecification Spec( 8611 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8612 8613 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8614 QualType ArgType = Context.getRValueReferenceType(ClassType); 8615 8616 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8617 8618 DeclarationName Name 8619 = Context.DeclarationNames.getCXXConstructorName( 8620 Context.getCanonicalType(ClassType)); 8621 SourceLocation ClassLoc = ClassDecl->getLocation(); 8622 DeclarationNameInfo NameInfo(Name, ClassLoc); 8623 8624 // C++0x [class.copy]p11: 8625 // An implicitly-declared copy/move constructor is an inline public 8626 // member of its class. 8627 CXXConstructorDecl *MoveConstructor 8628 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8629 Context.getFunctionType(Context.VoidTy, 8630 &ArgType, 1, EPI), 8631 /*TInfo=*/0, 8632 /*isExplicit=*/false, 8633 /*isInline=*/true, 8634 /*isImplicitlyDeclared=*/true, 8635 // FIXME: apply the rules for definitions here 8636 /*isConstexpr=*/false); 8637 MoveConstructor->setAccess(AS_public); 8638 MoveConstructor->setDefaulted(); 8639 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8640 8641 // Add the parameter to the constructor. 8642 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8643 ClassLoc, ClassLoc, 8644 /*IdentifierInfo=*/0, 8645 ArgType, /*TInfo=*/0, 8646 SC_None, 8647 SC_None, 0); 8648 MoveConstructor->setParams(FromParam); 8649 8650 // C++0x [class.copy]p9: 8651 // If the definition of a class X does not explicitly declare a move 8652 // constructor, one will be implicitly declared as defaulted if and only if: 8653 // [...] 8654 // - the move constructor would not be implicitly defined as deleted. 8655 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8656 // Cache this result so that we don't try to generate this over and over 8657 // on every lookup, leaking memory and wasting time. 8658 ClassDecl->setFailedImplicitMoveConstructor(); 8659 return 0; 8660 } 8661 8662 // Note that we have declared this constructor. 8663 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8664 8665 if (Scope *S = getScopeForContext(ClassDecl)) 8666 PushOnScopeChains(MoveConstructor, S, false); 8667 ClassDecl->addDecl(MoveConstructor); 8668 8669 return MoveConstructor; 8670} 8671 8672void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8673 CXXConstructorDecl *MoveConstructor) { 8674 assert((MoveConstructor->isDefaulted() && 8675 MoveConstructor->isMoveConstructor() && 8676 !MoveConstructor->doesThisDeclarationHaveABody()) && 8677 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8678 8679 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8680 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8681 8682 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8683 DiagnosticErrorTrap Trap(Diags); 8684 8685 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8686 Trap.hasErrorOccurred()) { 8687 Diag(CurrentLocation, diag::note_member_synthesized_at) 8688 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8689 MoveConstructor->setInvalidDecl(); 8690 } else { 8691 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8692 MoveConstructor->getLocation(), 8693 MultiStmtArg(*this, 0, 0), 8694 /*isStmtExpr=*/false) 8695 .takeAs<Stmt>()); 8696 MoveConstructor->setImplicitlyDefined(true); 8697 } 8698 8699 MoveConstructor->setUsed(); 8700 8701 if (ASTMutationListener *L = getASTMutationListener()) { 8702 L->CompletedImplicitDefinition(MoveConstructor); 8703 } 8704} 8705 8706ExprResult 8707Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8708 CXXConstructorDecl *Constructor, 8709 MultiExprArg ExprArgs, 8710 bool HadMultipleCandidates, 8711 bool RequiresZeroInit, 8712 unsigned ConstructKind, 8713 SourceRange ParenRange) { 8714 bool Elidable = false; 8715 8716 // C++0x [class.copy]p34: 8717 // When certain criteria are met, an implementation is allowed to 8718 // omit the copy/move construction of a class object, even if the 8719 // copy/move constructor and/or destructor for the object have 8720 // side effects. [...] 8721 // - when a temporary class object that has not been bound to a 8722 // reference (12.2) would be copied/moved to a class object 8723 // with the same cv-unqualified type, the copy/move operation 8724 // can be omitted by constructing the temporary object 8725 // directly into the target of the omitted copy/move 8726 if (ConstructKind == CXXConstructExpr::CK_Complete && 8727 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8728 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8729 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8730 } 8731 8732 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8733 Elidable, move(ExprArgs), HadMultipleCandidates, 8734 RequiresZeroInit, ConstructKind, ParenRange); 8735} 8736 8737/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8738/// including handling of its default argument expressions. 8739ExprResult 8740Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8741 CXXConstructorDecl *Constructor, bool Elidable, 8742 MultiExprArg ExprArgs, 8743 bool HadMultipleCandidates, 8744 bool RequiresZeroInit, 8745 unsigned ConstructKind, 8746 SourceRange ParenRange) { 8747 unsigned NumExprs = ExprArgs.size(); 8748 Expr **Exprs = (Expr **)ExprArgs.release(); 8749 8750 for (specific_attr_iterator<NonNullAttr> 8751 i = Constructor->specific_attr_begin<NonNullAttr>(), 8752 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8753 const NonNullAttr *NonNull = *i; 8754 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8755 } 8756 8757 MarkDeclarationReferenced(ConstructLoc, Constructor); 8758 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8759 Constructor, Elidable, Exprs, NumExprs, 8760 HadMultipleCandidates, RequiresZeroInit, 8761 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8762 ParenRange)); 8763} 8764 8765bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8766 CXXConstructorDecl *Constructor, 8767 MultiExprArg Exprs, 8768 bool HadMultipleCandidates) { 8769 // FIXME: Provide the correct paren SourceRange when available. 8770 ExprResult TempResult = 8771 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8772 move(Exprs), HadMultipleCandidates, false, 8773 CXXConstructExpr::CK_Complete, SourceRange()); 8774 if (TempResult.isInvalid()) 8775 return true; 8776 8777 Expr *Temp = TempResult.takeAs<Expr>(); 8778 CheckImplicitConversions(Temp, VD->getLocation()); 8779 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8780 Temp = MaybeCreateExprWithCleanups(Temp); 8781 VD->setInit(Temp); 8782 8783 return false; 8784} 8785 8786void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8787 if (VD->isInvalidDecl()) return; 8788 8789 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8790 if (ClassDecl->isInvalidDecl()) return; 8791 if (ClassDecl->hasTrivialDestructor()) return; 8792 if (ClassDecl->isDependentContext()) return; 8793 8794 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8795 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8796 CheckDestructorAccess(VD->getLocation(), Destructor, 8797 PDiag(diag::err_access_dtor_var) 8798 << VD->getDeclName() 8799 << VD->getType()); 8800 8801 if (!VD->hasGlobalStorage()) return; 8802 8803 // Emit warning for non-trivial dtor in global scope (a real global, 8804 // class-static, function-static). 8805 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8806 8807 // TODO: this should be re-enabled for static locals by !CXAAtExit 8808 if (!VD->isStaticLocal()) 8809 Diag(VD->getLocation(), diag::warn_global_destructor); 8810} 8811 8812/// AddCXXDirectInitializerToDecl - This action is called immediately after 8813/// ActOnDeclarator, when a C++ direct initializer is present. 8814/// e.g: "int x(1);" 8815void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8816 SourceLocation LParenLoc, 8817 MultiExprArg Exprs, 8818 SourceLocation RParenLoc, 8819 bool TypeMayContainAuto) { 8820 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8821 8822 // If there is no declaration, there was an error parsing it. Just ignore 8823 // the initializer. 8824 if (RealDecl == 0) 8825 return; 8826 8827 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8828 if (!VDecl) { 8829 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8830 RealDecl->setInvalidDecl(); 8831 return; 8832 } 8833 8834 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8835 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8836 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8837 if (Exprs.size() > 1) { 8838 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8839 diag::err_auto_var_init_multiple_expressions) 8840 << VDecl->getDeclName() << VDecl->getType() 8841 << VDecl->getSourceRange(); 8842 RealDecl->setInvalidDecl(); 8843 return; 8844 } 8845 8846 Expr *Init = Exprs.get()[0]; 8847 TypeSourceInfo *DeducedType = 0; 8848 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8849 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8850 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8851 << Init->getSourceRange(); 8852 if (!DeducedType) { 8853 RealDecl->setInvalidDecl(); 8854 return; 8855 } 8856 VDecl->setTypeSourceInfo(DeducedType); 8857 VDecl->setType(DeducedType->getType()); 8858 8859 // In ARC, infer lifetime. 8860 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8861 VDecl->setInvalidDecl(); 8862 8863 // If this is a redeclaration, check that the type we just deduced matches 8864 // the previously declared type. 8865 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8866 MergeVarDeclTypes(VDecl, Old); 8867 } 8868 8869 // We will represent direct-initialization similarly to copy-initialization: 8870 // int x(1); -as-> int x = 1; 8871 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8872 // 8873 // Clients that want to distinguish between the two forms, can check for 8874 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8875 // A major benefit is that clients that don't particularly care about which 8876 // exactly form was it (like the CodeGen) can handle both cases without 8877 // special case code. 8878 8879 // C++ 8.5p11: 8880 // The form of initialization (using parentheses or '=') is generally 8881 // insignificant, but does matter when the entity being initialized has a 8882 // class type. 8883 8884 if (!VDecl->getType()->isDependentType() && 8885 !VDecl->getType()->isIncompleteArrayType() && 8886 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8887 diag::err_typecheck_decl_incomplete_type)) { 8888 VDecl->setInvalidDecl(); 8889 return; 8890 } 8891 8892 // The variable can not have an abstract class type. 8893 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8894 diag::err_abstract_type_in_decl, 8895 AbstractVariableType)) 8896 VDecl->setInvalidDecl(); 8897 8898 const VarDecl *Def; 8899 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8900 Diag(VDecl->getLocation(), diag::err_redefinition) 8901 << VDecl->getDeclName(); 8902 Diag(Def->getLocation(), diag::note_previous_definition); 8903 VDecl->setInvalidDecl(); 8904 return; 8905 } 8906 8907 // C++ [class.static.data]p4 8908 // If a static data member is of const integral or const 8909 // enumeration type, its declaration in the class definition can 8910 // specify a constant-initializer which shall be an integral 8911 // constant expression (5.19). In that case, the member can appear 8912 // in integral constant expressions. The member shall still be 8913 // defined in a namespace scope if it is used in the program and the 8914 // namespace scope definition shall not contain an initializer. 8915 // 8916 // We already performed a redefinition check above, but for static 8917 // data members we also need to check whether there was an in-class 8918 // declaration with an initializer. 8919 const VarDecl* PrevInit = 0; 8920 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8921 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8922 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8923 return; 8924 } 8925 8926 bool IsDependent = false; 8927 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8928 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8929 VDecl->setInvalidDecl(); 8930 return; 8931 } 8932 8933 if (Exprs.get()[I]->isTypeDependent()) 8934 IsDependent = true; 8935 } 8936 8937 // If either the declaration has a dependent type or if any of the 8938 // expressions is type-dependent, we represent the initialization 8939 // via a ParenListExpr for later use during template instantiation. 8940 if (VDecl->getType()->isDependentType() || IsDependent) { 8941 // Let clients know that initialization was done with a direct initializer. 8942 VDecl->setCXXDirectInitializer(true); 8943 8944 // Store the initialization expressions as a ParenListExpr. 8945 unsigned NumExprs = Exprs.size(); 8946 VDecl->setInit(new (Context) ParenListExpr( 8947 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8948 VDecl->getType().getNonReferenceType())); 8949 return; 8950 } 8951 8952 // Capture the variable that is being initialized and the style of 8953 // initialization. 8954 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8955 8956 // FIXME: Poor source location information. 8957 InitializationKind Kind 8958 = InitializationKind::CreateDirect(VDecl->getLocation(), 8959 LParenLoc, RParenLoc); 8960 8961 QualType T = VDecl->getType(); 8962 InitializationSequence InitSeq(*this, Entity, Kind, 8963 Exprs.get(), Exprs.size()); 8964 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8965 if (Result.isInvalid()) { 8966 VDecl->setInvalidDecl(); 8967 return; 8968 } else if (T != VDecl->getType()) { 8969 VDecl->setType(T); 8970 Result.get()->setType(T); 8971 } 8972 8973 8974 Expr *Init = Result.get(); 8975 CheckImplicitConversions(Init, LParenLoc); 8976 8977 Init = MaybeCreateExprWithCleanups(Init); 8978 VDecl->setInit(Init); 8979 VDecl->setCXXDirectInitializer(true); 8980 8981 CheckCompleteVariableDeclaration(VDecl); 8982} 8983 8984/// \brief Given a constructor and the set of arguments provided for the 8985/// constructor, convert the arguments and add any required default arguments 8986/// to form a proper call to this constructor. 8987/// 8988/// \returns true if an error occurred, false otherwise. 8989bool 8990Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8991 MultiExprArg ArgsPtr, 8992 SourceLocation Loc, 8993 ASTOwningVector<Expr*> &ConvertedArgs) { 8994 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8995 unsigned NumArgs = ArgsPtr.size(); 8996 Expr **Args = (Expr **)ArgsPtr.get(); 8997 8998 const FunctionProtoType *Proto 8999 = Constructor->getType()->getAs<FunctionProtoType>(); 9000 assert(Proto && "Constructor without a prototype?"); 9001 unsigned NumArgsInProto = Proto->getNumArgs(); 9002 9003 // If too few arguments are available, we'll fill in the rest with defaults. 9004 if (NumArgs < NumArgsInProto) 9005 ConvertedArgs.reserve(NumArgsInProto); 9006 else 9007 ConvertedArgs.reserve(NumArgs); 9008 9009 VariadicCallType CallType = 9010 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9011 SmallVector<Expr *, 8> AllArgs; 9012 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9013 Proto, 0, Args, NumArgs, AllArgs, 9014 CallType); 9015 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9016 ConvertedArgs.push_back(AllArgs[i]); 9017 return Invalid; 9018} 9019 9020static inline bool 9021CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9022 const FunctionDecl *FnDecl) { 9023 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9024 if (isa<NamespaceDecl>(DC)) { 9025 return SemaRef.Diag(FnDecl->getLocation(), 9026 diag::err_operator_new_delete_declared_in_namespace) 9027 << FnDecl->getDeclName(); 9028 } 9029 9030 if (isa<TranslationUnitDecl>(DC) && 9031 FnDecl->getStorageClass() == SC_Static) { 9032 return SemaRef.Diag(FnDecl->getLocation(), 9033 diag::err_operator_new_delete_declared_static) 9034 << FnDecl->getDeclName(); 9035 } 9036 9037 return false; 9038} 9039 9040static inline bool 9041CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9042 CanQualType ExpectedResultType, 9043 CanQualType ExpectedFirstParamType, 9044 unsigned DependentParamTypeDiag, 9045 unsigned InvalidParamTypeDiag) { 9046 QualType ResultType = 9047 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9048 9049 // Check that the result type is not dependent. 9050 if (ResultType->isDependentType()) 9051 return SemaRef.Diag(FnDecl->getLocation(), 9052 diag::err_operator_new_delete_dependent_result_type) 9053 << FnDecl->getDeclName() << ExpectedResultType; 9054 9055 // Check that the result type is what we expect. 9056 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9057 return SemaRef.Diag(FnDecl->getLocation(), 9058 diag::err_operator_new_delete_invalid_result_type) 9059 << FnDecl->getDeclName() << ExpectedResultType; 9060 9061 // A function template must have at least 2 parameters. 9062 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9063 return SemaRef.Diag(FnDecl->getLocation(), 9064 diag::err_operator_new_delete_template_too_few_parameters) 9065 << FnDecl->getDeclName(); 9066 9067 // The function decl must have at least 1 parameter. 9068 if (FnDecl->getNumParams() == 0) 9069 return SemaRef.Diag(FnDecl->getLocation(), 9070 diag::err_operator_new_delete_too_few_parameters) 9071 << FnDecl->getDeclName(); 9072 9073 // Check the the first parameter type is not dependent. 9074 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9075 if (FirstParamType->isDependentType()) 9076 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9077 << FnDecl->getDeclName() << ExpectedFirstParamType; 9078 9079 // Check that the first parameter type is what we expect. 9080 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9081 ExpectedFirstParamType) 9082 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9083 << FnDecl->getDeclName() << ExpectedFirstParamType; 9084 9085 return false; 9086} 9087 9088static bool 9089CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9090 // C++ [basic.stc.dynamic.allocation]p1: 9091 // A program is ill-formed if an allocation function is declared in a 9092 // namespace scope other than global scope or declared static in global 9093 // scope. 9094 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9095 return true; 9096 9097 CanQualType SizeTy = 9098 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9099 9100 // C++ [basic.stc.dynamic.allocation]p1: 9101 // The return type shall be void*. The first parameter shall have type 9102 // std::size_t. 9103 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9104 SizeTy, 9105 diag::err_operator_new_dependent_param_type, 9106 diag::err_operator_new_param_type)) 9107 return true; 9108 9109 // C++ [basic.stc.dynamic.allocation]p1: 9110 // The first parameter shall not have an associated default argument. 9111 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9112 return SemaRef.Diag(FnDecl->getLocation(), 9113 diag::err_operator_new_default_arg) 9114 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9115 9116 return false; 9117} 9118 9119static bool 9120CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9121 // C++ [basic.stc.dynamic.deallocation]p1: 9122 // A program is ill-formed if deallocation functions are declared in a 9123 // namespace scope other than global scope or declared static in global 9124 // scope. 9125 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9126 return true; 9127 9128 // C++ [basic.stc.dynamic.deallocation]p2: 9129 // Each deallocation function shall return void and its first parameter 9130 // shall be void*. 9131 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9132 SemaRef.Context.VoidPtrTy, 9133 diag::err_operator_delete_dependent_param_type, 9134 diag::err_operator_delete_param_type)) 9135 return true; 9136 9137 return false; 9138} 9139 9140/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9141/// of this overloaded operator is well-formed. If so, returns false; 9142/// otherwise, emits appropriate diagnostics and returns true. 9143bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9144 assert(FnDecl && FnDecl->isOverloadedOperator() && 9145 "Expected an overloaded operator declaration"); 9146 9147 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9148 9149 // C++ [over.oper]p5: 9150 // The allocation and deallocation functions, operator new, 9151 // operator new[], operator delete and operator delete[], are 9152 // described completely in 3.7.3. The attributes and restrictions 9153 // found in the rest of this subclause do not apply to them unless 9154 // explicitly stated in 3.7.3. 9155 if (Op == OO_Delete || Op == OO_Array_Delete) 9156 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9157 9158 if (Op == OO_New || Op == OO_Array_New) 9159 return CheckOperatorNewDeclaration(*this, FnDecl); 9160 9161 // C++ [over.oper]p6: 9162 // An operator function shall either be a non-static member 9163 // function or be a non-member function and have at least one 9164 // parameter whose type is a class, a reference to a class, an 9165 // enumeration, or a reference to an enumeration. 9166 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9167 if (MethodDecl->isStatic()) 9168 return Diag(FnDecl->getLocation(), 9169 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9170 } else { 9171 bool ClassOrEnumParam = false; 9172 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9173 ParamEnd = FnDecl->param_end(); 9174 Param != ParamEnd; ++Param) { 9175 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9176 if (ParamType->isDependentType() || ParamType->isRecordType() || 9177 ParamType->isEnumeralType()) { 9178 ClassOrEnumParam = true; 9179 break; 9180 } 9181 } 9182 9183 if (!ClassOrEnumParam) 9184 return Diag(FnDecl->getLocation(), 9185 diag::err_operator_overload_needs_class_or_enum) 9186 << FnDecl->getDeclName(); 9187 } 9188 9189 // C++ [over.oper]p8: 9190 // An operator function cannot have default arguments (8.3.6), 9191 // except where explicitly stated below. 9192 // 9193 // Only the function-call operator allows default arguments 9194 // (C++ [over.call]p1). 9195 if (Op != OO_Call) { 9196 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9197 Param != FnDecl->param_end(); ++Param) { 9198 if ((*Param)->hasDefaultArg()) 9199 return Diag((*Param)->getLocation(), 9200 diag::err_operator_overload_default_arg) 9201 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9202 } 9203 } 9204 9205 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9206 { false, false, false } 9207#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9208 , { Unary, Binary, MemberOnly } 9209#include "clang/Basic/OperatorKinds.def" 9210 }; 9211 9212 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9213 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9214 bool MustBeMemberOperator = OperatorUses[Op][2]; 9215 9216 // C++ [over.oper]p8: 9217 // [...] Operator functions cannot have more or fewer parameters 9218 // than the number required for the corresponding operator, as 9219 // described in the rest of this subclause. 9220 unsigned NumParams = FnDecl->getNumParams() 9221 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9222 if (Op != OO_Call && 9223 ((NumParams == 1 && !CanBeUnaryOperator) || 9224 (NumParams == 2 && !CanBeBinaryOperator) || 9225 (NumParams < 1) || (NumParams > 2))) { 9226 // We have the wrong number of parameters. 9227 unsigned ErrorKind; 9228 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9229 ErrorKind = 2; // 2 -> unary or binary. 9230 } else if (CanBeUnaryOperator) { 9231 ErrorKind = 0; // 0 -> unary 9232 } else { 9233 assert(CanBeBinaryOperator && 9234 "All non-call overloaded operators are unary or binary!"); 9235 ErrorKind = 1; // 1 -> binary 9236 } 9237 9238 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9239 << FnDecl->getDeclName() << NumParams << ErrorKind; 9240 } 9241 9242 // Overloaded operators other than operator() cannot be variadic. 9243 if (Op != OO_Call && 9244 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9245 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9246 << FnDecl->getDeclName(); 9247 } 9248 9249 // Some operators must be non-static member functions. 9250 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9251 return Diag(FnDecl->getLocation(), 9252 diag::err_operator_overload_must_be_member) 9253 << FnDecl->getDeclName(); 9254 } 9255 9256 // C++ [over.inc]p1: 9257 // The user-defined function called operator++ implements the 9258 // prefix and postfix ++ operator. If this function is a member 9259 // function with no parameters, or a non-member function with one 9260 // parameter of class or enumeration type, it defines the prefix 9261 // increment operator ++ for objects of that type. If the function 9262 // is a member function with one parameter (which shall be of type 9263 // int) or a non-member function with two parameters (the second 9264 // of which shall be of type int), it defines the postfix 9265 // increment operator ++ for objects of that type. 9266 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9267 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9268 bool ParamIsInt = false; 9269 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9270 ParamIsInt = BT->getKind() == BuiltinType::Int; 9271 9272 if (!ParamIsInt) 9273 return Diag(LastParam->getLocation(), 9274 diag::err_operator_overload_post_incdec_must_be_int) 9275 << LastParam->getType() << (Op == OO_MinusMinus); 9276 } 9277 9278 return false; 9279} 9280 9281/// CheckLiteralOperatorDeclaration - Check whether the declaration 9282/// of this literal operator function is well-formed. If so, returns 9283/// false; otherwise, emits appropriate diagnostics and returns true. 9284bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9285 DeclContext *DC = FnDecl->getDeclContext(); 9286 Decl::Kind Kind = DC->getDeclKind(); 9287 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9288 Kind != Decl::LinkageSpec) { 9289 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9290 << FnDecl->getDeclName(); 9291 return true; 9292 } 9293 9294 bool Valid = false; 9295 9296 // template <char...> type operator "" name() is the only valid template 9297 // signature, and the only valid signature with no parameters. 9298 if (FnDecl->param_size() == 0) { 9299 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9300 // Must have only one template parameter 9301 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9302 if (Params->size() == 1) { 9303 NonTypeTemplateParmDecl *PmDecl = 9304 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9305 9306 // The template parameter must be a char parameter pack. 9307 if (PmDecl && PmDecl->isTemplateParameterPack() && 9308 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9309 Valid = true; 9310 } 9311 } 9312 } else { 9313 // Check the first parameter 9314 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9315 9316 QualType T = (*Param)->getType(); 9317 9318 // unsigned long long int, long double, and any character type are allowed 9319 // as the only parameters. 9320 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9321 Context.hasSameType(T, Context.LongDoubleTy) || 9322 Context.hasSameType(T, Context.CharTy) || 9323 Context.hasSameType(T, Context.WCharTy) || 9324 Context.hasSameType(T, Context.Char16Ty) || 9325 Context.hasSameType(T, Context.Char32Ty)) { 9326 if (++Param == FnDecl->param_end()) 9327 Valid = true; 9328 goto FinishedParams; 9329 } 9330 9331 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9332 const PointerType *PT = T->getAs<PointerType>(); 9333 if (!PT) 9334 goto FinishedParams; 9335 T = PT->getPointeeType(); 9336 if (!T.isConstQualified()) 9337 goto FinishedParams; 9338 T = T.getUnqualifiedType(); 9339 9340 // Move on to the second parameter; 9341 ++Param; 9342 9343 // If there is no second parameter, the first must be a const char * 9344 if (Param == FnDecl->param_end()) { 9345 if (Context.hasSameType(T, Context.CharTy)) 9346 Valid = true; 9347 goto FinishedParams; 9348 } 9349 9350 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9351 // are allowed as the first parameter to a two-parameter function 9352 if (!(Context.hasSameType(T, Context.CharTy) || 9353 Context.hasSameType(T, Context.WCharTy) || 9354 Context.hasSameType(T, Context.Char16Ty) || 9355 Context.hasSameType(T, Context.Char32Ty))) 9356 goto FinishedParams; 9357 9358 // The second and final parameter must be an std::size_t 9359 T = (*Param)->getType().getUnqualifiedType(); 9360 if (Context.hasSameType(T, Context.getSizeType()) && 9361 ++Param == FnDecl->param_end()) 9362 Valid = true; 9363 } 9364 9365 // FIXME: This diagnostic is absolutely terrible. 9366FinishedParams: 9367 if (!Valid) { 9368 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9369 << FnDecl->getDeclName(); 9370 return true; 9371 } 9372 9373 StringRef LiteralName 9374 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9375 if (LiteralName[0] != '_') { 9376 // C++0x [usrlit.suffix]p1: 9377 // Literal suffix identifiers that do not start with an underscore are 9378 // reserved for future standardization. 9379 bool IsHexFloat = true; 9380 if (LiteralName.size() > 1 && 9381 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9382 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9383 if (!isdigit(LiteralName[I])) { 9384 IsHexFloat = false; 9385 break; 9386 } 9387 } 9388 } 9389 9390 if (IsHexFloat) 9391 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9392 << LiteralName; 9393 else 9394 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9395 } 9396 9397 return false; 9398} 9399 9400/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9401/// linkage specification, including the language and (if present) 9402/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9403/// the location of the language string literal, which is provided 9404/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9405/// the '{' brace. Otherwise, this linkage specification does not 9406/// have any braces. 9407Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9408 SourceLocation LangLoc, 9409 StringRef Lang, 9410 SourceLocation LBraceLoc) { 9411 LinkageSpecDecl::LanguageIDs Language; 9412 if (Lang == "\"C\"") 9413 Language = LinkageSpecDecl::lang_c; 9414 else if (Lang == "\"C++\"") 9415 Language = LinkageSpecDecl::lang_cxx; 9416 else { 9417 Diag(LangLoc, diag::err_bad_language); 9418 return 0; 9419 } 9420 9421 // FIXME: Add all the various semantics of linkage specifications 9422 9423 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9424 ExternLoc, LangLoc, Language); 9425 CurContext->addDecl(D); 9426 PushDeclContext(S, D); 9427 return D; 9428} 9429 9430/// ActOnFinishLinkageSpecification - Complete the definition of 9431/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9432/// valid, it's the position of the closing '}' brace in a linkage 9433/// specification that uses braces. 9434Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9435 Decl *LinkageSpec, 9436 SourceLocation RBraceLoc) { 9437 if (LinkageSpec) { 9438 if (RBraceLoc.isValid()) { 9439 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9440 LSDecl->setRBraceLoc(RBraceLoc); 9441 } 9442 PopDeclContext(); 9443 } 9444 return LinkageSpec; 9445} 9446 9447/// \brief Perform semantic analysis for the variable declaration that 9448/// occurs within a C++ catch clause, returning the newly-created 9449/// variable. 9450VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9451 TypeSourceInfo *TInfo, 9452 SourceLocation StartLoc, 9453 SourceLocation Loc, 9454 IdentifierInfo *Name) { 9455 bool Invalid = false; 9456 QualType ExDeclType = TInfo->getType(); 9457 9458 // Arrays and functions decay. 9459 if (ExDeclType->isArrayType()) 9460 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9461 else if (ExDeclType->isFunctionType()) 9462 ExDeclType = Context.getPointerType(ExDeclType); 9463 9464 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9465 // The exception-declaration shall not denote a pointer or reference to an 9466 // incomplete type, other than [cv] void*. 9467 // N2844 forbids rvalue references. 9468 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9469 Diag(Loc, diag::err_catch_rvalue_ref); 9470 Invalid = true; 9471 } 9472 9473 // GCC allows catching pointers and references to incomplete types 9474 // as an extension; so do we, but we warn by default. 9475 9476 QualType BaseType = ExDeclType; 9477 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9478 unsigned DK = diag::err_catch_incomplete; 9479 bool IncompleteCatchIsInvalid = true; 9480 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9481 BaseType = Ptr->getPointeeType(); 9482 Mode = 1; 9483 DK = diag::ext_catch_incomplete_ptr; 9484 IncompleteCatchIsInvalid = false; 9485 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9486 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9487 BaseType = Ref->getPointeeType(); 9488 Mode = 2; 9489 DK = diag::ext_catch_incomplete_ref; 9490 IncompleteCatchIsInvalid = false; 9491 } 9492 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9493 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9494 IncompleteCatchIsInvalid) 9495 Invalid = true; 9496 9497 if (!Invalid && !ExDeclType->isDependentType() && 9498 RequireNonAbstractType(Loc, ExDeclType, 9499 diag::err_abstract_type_in_decl, 9500 AbstractVariableType)) 9501 Invalid = true; 9502 9503 // Only the non-fragile NeXT runtime currently supports C++ catches 9504 // of ObjC types, and no runtime supports catching ObjC types by value. 9505 if (!Invalid && getLangOptions().ObjC1) { 9506 QualType T = ExDeclType; 9507 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9508 T = RT->getPointeeType(); 9509 9510 if (T->isObjCObjectType()) { 9511 Diag(Loc, diag::err_objc_object_catch); 9512 Invalid = true; 9513 } else if (T->isObjCObjectPointerType()) { 9514 if (!getLangOptions().ObjCNonFragileABI) 9515 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9516 } 9517 } 9518 9519 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9520 ExDeclType, TInfo, SC_None, SC_None); 9521 ExDecl->setExceptionVariable(true); 9522 9523 if (!Invalid && !ExDeclType->isDependentType()) { 9524 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9525 // C++ [except.handle]p16: 9526 // The object declared in an exception-declaration or, if the 9527 // exception-declaration does not specify a name, a temporary (12.2) is 9528 // copy-initialized (8.5) from the exception object. [...] 9529 // The object is destroyed when the handler exits, after the destruction 9530 // of any automatic objects initialized within the handler. 9531 // 9532 // We just pretend to initialize the object with itself, then make sure 9533 // it can be destroyed later. 9534 QualType initType = ExDeclType; 9535 9536 InitializedEntity entity = 9537 InitializedEntity::InitializeVariable(ExDecl); 9538 InitializationKind initKind = 9539 InitializationKind::CreateCopy(Loc, SourceLocation()); 9540 9541 Expr *opaqueValue = 9542 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9543 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9544 ExprResult result = sequence.Perform(*this, entity, initKind, 9545 MultiExprArg(&opaqueValue, 1)); 9546 if (result.isInvalid()) 9547 Invalid = true; 9548 else { 9549 // If the constructor used was non-trivial, set this as the 9550 // "initializer". 9551 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9552 if (!construct->getConstructor()->isTrivial()) { 9553 Expr *init = MaybeCreateExprWithCleanups(construct); 9554 ExDecl->setInit(init); 9555 } 9556 9557 // And make sure it's destructable. 9558 FinalizeVarWithDestructor(ExDecl, recordType); 9559 } 9560 } 9561 } 9562 9563 if (Invalid) 9564 ExDecl->setInvalidDecl(); 9565 9566 return ExDecl; 9567} 9568 9569/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9570/// handler. 9571Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9572 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9573 bool Invalid = D.isInvalidType(); 9574 9575 // Check for unexpanded parameter packs. 9576 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9577 UPPC_ExceptionType)) { 9578 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9579 D.getIdentifierLoc()); 9580 Invalid = true; 9581 } 9582 9583 IdentifierInfo *II = D.getIdentifier(); 9584 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9585 LookupOrdinaryName, 9586 ForRedeclaration)) { 9587 // The scope should be freshly made just for us. There is just no way 9588 // it contains any previous declaration. 9589 assert(!S->isDeclScope(PrevDecl)); 9590 if (PrevDecl->isTemplateParameter()) { 9591 // Maybe we will complain about the shadowed template parameter. 9592 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9593 PrevDecl = 0; 9594 } 9595 } 9596 9597 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9598 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9599 << D.getCXXScopeSpec().getRange(); 9600 Invalid = true; 9601 } 9602 9603 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9604 D.getSourceRange().getBegin(), 9605 D.getIdentifierLoc(), 9606 D.getIdentifier()); 9607 if (Invalid) 9608 ExDecl->setInvalidDecl(); 9609 9610 // Add the exception declaration into this scope. 9611 if (II) 9612 PushOnScopeChains(ExDecl, S); 9613 else 9614 CurContext->addDecl(ExDecl); 9615 9616 ProcessDeclAttributes(S, ExDecl, D); 9617 return ExDecl; 9618} 9619 9620Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9621 Expr *AssertExpr, 9622 Expr *AssertMessageExpr_, 9623 SourceLocation RParenLoc) { 9624 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9625 9626 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9627 llvm::APSInt Value(32); 9628 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9629 Diag(StaticAssertLoc, 9630 diag::err_static_assert_expression_is_not_constant) << 9631 AssertExpr->getSourceRange(); 9632 return 0; 9633 } 9634 9635 if (Value == 0) { 9636 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9637 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9638 } 9639 } 9640 9641 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9642 return 0; 9643 9644 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9645 AssertExpr, AssertMessage, RParenLoc); 9646 9647 CurContext->addDecl(Decl); 9648 return Decl; 9649} 9650 9651/// \brief Perform semantic analysis of the given friend type declaration. 9652/// 9653/// \returns A friend declaration that. 9654FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9655 SourceLocation FriendLoc, 9656 TypeSourceInfo *TSInfo) { 9657 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9658 9659 QualType T = TSInfo->getType(); 9660 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9661 9662 // C++03 [class.friend]p2: 9663 // An elaborated-type-specifier shall be used in a friend declaration 9664 // for a class.* 9665 // 9666 // * The class-key of the elaborated-type-specifier is required. 9667 if (!ActiveTemplateInstantiations.empty()) { 9668 // Do not complain about the form of friend template types during 9669 // template instantiation; we will already have complained when the 9670 // template was declared. 9671 } else if (!T->isElaboratedTypeSpecifier()) { 9672 // If we evaluated the type to a record type, suggest putting 9673 // a tag in front. 9674 if (const RecordType *RT = T->getAs<RecordType>()) { 9675 RecordDecl *RD = RT->getDecl(); 9676 9677 std::string InsertionText = std::string(" ") + RD->getKindName(); 9678 9679 Diag(TypeRange.getBegin(), 9680 getLangOptions().CPlusPlus0x ? 9681 diag::warn_cxx98_compat_unelaborated_friend_type : 9682 diag::ext_unelaborated_friend_type) 9683 << (unsigned) RD->getTagKind() 9684 << T 9685 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9686 InsertionText); 9687 } else { 9688 Diag(FriendLoc, 9689 getLangOptions().CPlusPlus0x ? 9690 diag::warn_cxx98_compat_nonclass_type_friend : 9691 diag::ext_nonclass_type_friend) 9692 << T 9693 << SourceRange(FriendLoc, TypeRange.getEnd()); 9694 } 9695 } else if (T->getAs<EnumType>()) { 9696 Diag(FriendLoc, 9697 getLangOptions().CPlusPlus0x ? 9698 diag::warn_cxx98_compat_enum_friend : 9699 diag::ext_enum_friend) 9700 << T 9701 << SourceRange(FriendLoc, TypeRange.getEnd()); 9702 } 9703 9704 // C++0x [class.friend]p3: 9705 // If the type specifier in a friend declaration designates a (possibly 9706 // cv-qualified) class type, that class is declared as a friend; otherwise, 9707 // the friend declaration is ignored. 9708 9709 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9710 // in [class.friend]p3 that we do not implement. 9711 9712 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9713} 9714 9715/// Handle a friend tag declaration where the scope specifier was 9716/// templated. 9717Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9718 unsigned TagSpec, SourceLocation TagLoc, 9719 CXXScopeSpec &SS, 9720 IdentifierInfo *Name, SourceLocation NameLoc, 9721 AttributeList *Attr, 9722 MultiTemplateParamsArg TempParamLists) { 9723 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9724 9725 bool isExplicitSpecialization = false; 9726 bool Invalid = false; 9727 9728 if (TemplateParameterList *TemplateParams 9729 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9730 TempParamLists.get(), 9731 TempParamLists.size(), 9732 /*friend*/ true, 9733 isExplicitSpecialization, 9734 Invalid)) { 9735 if (TemplateParams->size() > 0) { 9736 // This is a declaration of a class template. 9737 if (Invalid) 9738 return 0; 9739 9740 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9741 SS, Name, NameLoc, Attr, 9742 TemplateParams, AS_public, 9743 /*ModulePrivateLoc=*/SourceLocation(), 9744 TempParamLists.size() - 1, 9745 (TemplateParameterList**) TempParamLists.release()).take(); 9746 } else { 9747 // The "template<>" header is extraneous. 9748 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9749 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9750 isExplicitSpecialization = true; 9751 } 9752 } 9753 9754 if (Invalid) return 0; 9755 9756 bool isAllExplicitSpecializations = true; 9757 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9758 if (TempParamLists.get()[I]->size()) { 9759 isAllExplicitSpecializations = false; 9760 break; 9761 } 9762 } 9763 9764 // FIXME: don't ignore attributes. 9765 9766 // If it's explicit specializations all the way down, just forget 9767 // about the template header and build an appropriate non-templated 9768 // friend. TODO: for source fidelity, remember the headers. 9769 if (isAllExplicitSpecializations) { 9770 if (SS.isEmpty()) { 9771 bool Owned = false; 9772 bool IsDependent = false; 9773 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9774 Attr, AS_public, 9775 /*ModulePrivateLoc=*/SourceLocation(), 9776 MultiTemplateParamsArg(), Owned, IsDependent, 9777 /*ScopedEnum=*/false, 9778 /*ScopedEnumUsesClassTag=*/false, 9779 /*UnderlyingType=*/TypeResult()); 9780 } 9781 9782 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9783 ElaboratedTypeKeyword Keyword 9784 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9785 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9786 *Name, NameLoc); 9787 if (T.isNull()) 9788 return 0; 9789 9790 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9791 if (isa<DependentNameType>(T)) { 9792 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9793 TL.setKeywordLoc(TagLoc); 9794 TL.setQualifierLoc(QualifierLoc); 9795 TL.setNameLoc(NameLoc); 9796 } else { 9797 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9798 TL.setKeywordLoc(TagLoc); 9799 TL.setQualifierLoc(QualifierLoc); 9800 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9801 } 9802 9803 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9804 TSI, FriendLoc); 9805 Friend->setAccess(AS_public); 9806 CurContext->addDecl(Friend); 9807 return Friend; 9808 } 9809 9810 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9811 9812 9813 9814 // Handle the case of a templated-scope friend class. e.g. 9815 // template <class T> class A<T>::B; 9816 // FIXME: we don't support these right now. 9817 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9818 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9819 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9820 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9821 TL.setKeywordLoc(TagLoc); 9822 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9823 TL.setNameLoc(NameLoc); 9824 9825 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9826 TSI, FriendLoc); 9827 Friend->setAccess(AS_public); 9828 Friend->setUnsupportedFriend(true); 9829 CurContext->addDecl(Friend); 9830 return Friend; 9831} 9832 9833 9834/// Handle a friend type declaration. This works in tandem with 9835/// ActOnTag. 9836/// 9837/// Notes on friend class templates: 9838/// 9839/// We generally treat friend class declarations as if they were 9840/// declaring a class. So, for example, the elaborated type specifier 9841/// in a friend declaration is required to obey the restrictions of a 9842/// class-head (i.e. no typedefs in the scope chain), template 9843/// parameters are required to match up with simple template-ids, &c. 9844/// However, unlike when declaring a template specialization, it's 9845/// okay to refer to a template specialization without an empty 9846/// template parameter declaration, e.g. 9847/// friend class A<T>::B<unsigned>; 9848/// We permit this as a special case; if there are any template 9849/// parameters present at all, require proper matching, i.e. 9850/// template <> template <class T> friend class A<int>::B; 9851Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9852 MultiTemplateParamsArg TempParams) { 9853 SourceLocation Loc = DS.getSourceRange().getBegin(); 9854 9855 assert(DS.isFriendSpecified()); 9856 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9857 9858 // Try to convert the decl specifier to a type. This works for 9859 // friend templates because ActOnTag never produces a ClassTemplateDecl 9860 // for a TUK_Friend. 9861 Declarator TheDeclarator(DS, Declarator::MemberContext); 9862 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9863 QualType T = TSI->getType(); 9864 if (TheDeclarator.isInvalidType()) 9865 return 0; 9866 9867 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9868 return 0; 9869 9870 // This is definitely an error in C++98. It's probably meant to 9871 // be forbidden in C++0x, too, but the specification is just 9872 // poorly written. 9873 // 9874 // The problem is with declarations like the following: 9875 // template <T> friend A<T>::foo; 9876 // where deciding whether a class C is a friend or not now hinges 9877 // on whether there exists an instantiation of A that causes 9878 // 'foo' to equal C. There are restrictions on class-heads 9879 // (which we declare (by fiat) elaborated friend declarations to 9880 // be) that makes this tractable. 9881 // 9882 // FIXME: handle "template <> friend class A<T>;", which 9883 // is possibly well-formed? Who even knows? 9884 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9885 Diag(Loc, diag::err_tagless_friend_type_template) 9886 << DS.getSourceRange(); 9887 return 0; 9888 } 9889 9890 // C++98 [class.friend]p1: A friend of a class is a function 9891 // or class that is not a member of the class . . . 9892 // This is fixed in DR77, which just barely didn't make the C++03 9893 // deadline. It's also a very silly restriction that seriously 9894 // affects inner classes and which nobody else seems to implement; 9895 // thus we never diagnose it, not even in -pedantic. 9896 // 9897 // But note that we could warn about it: it's always useless to 9898 // friend one of your own members (it's not, however, worthless to 9899 // friend a member of an arbitrary specialization of your template). 9900 9901 Decl *D; 9902 if (unsigned NumTempParamLists = TempParams.size()) 9903 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9904 NumTempParamLists, 9905 TempParams.release(), 9906 TSI, 9907 DS.getFriendSpecLoc()); 9908 else 9909 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9910 9911 if (!D) 9912 return 0; 9913 9914 D->setAccess(AS_public); 9915 CurContext->addDecl(D); 9916 9917 return D; 9918} 9919 9920Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9921 MultiTemplateParamsArg TemplateParams) { 9922 const DeclSpec &DS = D.getDeclSpec(); 9923 9924 assert(DS.isFriendSpecified()); 9925 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9926 9927 SourceLocation Loc = D.getIdentifierLoc(); 9928 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9929 9930 // C++ [class.friend]p1 9931 // A friend of a class is a function or class.... 9932 // Note that this sees through typedefs, which is intended. 9933 // It *doesn't* see through dependent types, which is correct 9934 // according to [temp.arg.type]p3: 9935 // If a declaration acquires a function type through a 9936 // type dependent on a template-parameter and this causes 9937 // a declaration that does not use the syntactic form of a 9938 // function declarator to have a function type, the program 9939 // is ill-formed. 9940 if (!TInfo->getType()->isFunctionType()) { 9941 Diag(Loc, diag::err_unexpected_friend); 9942 9943 // It might be worthwhile to try to recover by creating an 9944 // appropriate declaration. 9945 return 0; 9946 } 9947 9948 // C++ [namespace.memdef]p3 9949 // - If a friend declaration in a non-local class first declares a 9950 // class or function, the friend class or function is a member 9951 // of the innermost enclosing namespace. 9952 // - The name of the friend is not found by simple name lookup 9953 // until a matching declaration is provided in that namespace 9954 // scope (either before or after the class declaration granting 9955 // friendship). 9956 // - If a friend function is called, its name may be found by the 9957 // name lookup that considers functions from namespaces and 9958 // classes associated with the types of the function arguments. 9959 // - When looking for a prior declaration of a class or a function 9960 // declared as a friend, scopes outside the innermost enclosing 9961 // namespace scope are not considered. 9962 9963 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9964 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9965 DeclarationName Name = NameInfo.getName(); 9966 assert(Name); 9967 9968 // Check for unexpanded parameter packs. 9969 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9970 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9971 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9972 return 0; 9973 9974 // The context we found the declaration in, or in which we should 9975 // create the declaration. 9976 DeclContext *DC; 9977 Scope *DCScope = S; 9978 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9979 ForRedeclaration); 9980 9981 // FIXME: there are different rules in local classes 9982 9983 // There are four cases here. 9984 // - There's no scope specifier, in which case we just go to the 9985 // appropriate scope and look for a function or function template 9986 // there as appropriate. 9987 // Recover from invalid scope qualifiers as if they just weren't there. 9988 if (SS.isInvalid() || !SS.isSet()) { 9989 // C++0x [namespace.memdef]p3: 9990 // If the name in a friend declaration is neither qualified nor 9991 // a template-id and the declaration is a function or an 9992 // elaborated-type-specifier, the lookup to determine whether 9993 // the entity has been previously declared shall not consider 9994 // any scopes outside the innermost enclosing namespace. 9995 // C++0x [class.friend]p11: 9996 // If a friend declaration appears in a local class and the name 9997 // specified is an unqualified name, a prior declaration is 9998 // looked up without considering scopes that are outside the 9999 // innermost enclosing non-class scope. For a friend function 10000 // declaration, if there is no prior declaration, the program is 10001 // ill-formed. 10002 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10003 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10004 10005 // Find the appropriate context according to the above. 10006 DC = CurContext; 10007 while (true) { 10008 // Skip class contexts. If someone can cite chapter and verse 10009 // for this behavior, that would be nice --- it's what GCC and 10010 // EDG do, and it seems like a reasonable intent, but the spec 10011 // really only says that checks for unqualified existing 10012 // declarations should stop at the nearest enclosing namespace, 10013 // not that they should only consider the nearest enclosing 10014 // namespace. 10015 while (DC->isRecord()) 10016 DC = DC->getParent(); 10017 10018 LookupQualifiedName(Previous, DC); 10019 10020 // TODO: decide what we think about using declarations. 10021 if (isLocal || !Previous.empty()) 10022 break; 10023 10024 if (isTemplateId) { 10025 if (isa<TranslationUnitDecl>(DC)) break; 10026 } else { 10027 if (DC->isFileContext()) break; 10028 } 10029 DC = DC->getParent(); 10030 } 10031 10032 // C++ [class.friend]p1: A friend of a class is a function or 10033 // class that is not a member of the class . . . 10034 // C++11 changes this for both friend types and functions. 10035 // Most C++ 98 compilers do seem to give an error here, so 10036 // we do, too. 10037 if (!Previous.empty() && DC->Equals(CurContext)) 10038 Diag(DS.getFriendSpecLoc(), 10039 getLangOptions().CPlusPlus0x ? 10040 diag::warn_cxx98_compat_friend_is_member : 10041 diag::err_friend_is_member); 10042 10043 DCScope = getScopeForDeclContext(S, DC); 10044 10045 // C++ [class.friend]p6: 10046 // A function can be defined in a friend declaration of a class if and 10047 // only if the class is a non-local class (9.8), the function name is 10048 // unqualified, and the function has namespace scope. 10049 if (isLocal && D.isFunctionDefinition()) { 10050 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10051 } 10052 10053 // - There's a non-dependent scope specifier, in which case we 10054 // compute it and do a previous lookup there for a function 10055 // or function template. 10056 } else if (!SS.getScopeRep()->isDependent()) { 10057 DC = computeDeclContext(SS); 10058 if (!DC) return 0; 10059 10060 if (RequireCompleteDeclContext(SS, DC)) return 0; 10061 10062 LookupQualifiedName(Previous, DC); 10063 10064 // Ignore things found implicitly in the wrong scope. 10065 // TODO: better diagnostics for this case. Suggesting the right 10066 // qualified scope would be nice... 10067 LookupResult::Filter F = Previous.makeFilter(); 10068 while (F.hasNext()) { 10069 NamedDecl *D = F.next(); 10070 if (!DC->InEnclosingNamespaceSetOf( 10071 D->getDeclContext()->getRedeclContext())) 10072 F.erase(); 10073 } 10074 F.done(); 10075 10076 if (Previous.empty()) { 10077 D.setInvalidType(); 10078 Diag(Loc, diag::err_qualified_friend_not_found) 10079 << Name << TInfo->getType(); 10080 return 0; 10081 } 10082 10083 // C++ [class.friend]p1: A friend of a class is a function or 10084 // class that is not a member of the class . . . 10085 if (DC->Equals(CurContext)) 10086 Diag(DS.getFriendSpecLoc(), 10087 getLangOptions().CPlusPlus0x ? 10088 diag::warn_cxx98_compat_friend_is_member : 10089 diag::err_friend_is_member); 10090 10091 if (D.isFunctionDefinition()) { 10092 // C++ [class.friend]p6: 10093 // A function can be defined in a friend declaration of a class if and 10094 // only if the class is a non-local class (9.8), the function name is 10095 // unqualified, and the function has namespace scope. 10096 SemaDiagnosticBuilder DB 10097 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10098 10099 DB << SS.getScopeRep(); 10100 if (DC->isFileContext()) 10101 DB << FixItHint::CreateRemoval(SS.getRange()); 10102 SS.clear(); 10103 } 10104 10105 // - There's a scope specifier that does not match any template 10106 // parameter lists, in which case we use some arbitrary context, 10107 // create a method or method template, and wait for instantiation. 10108 // - There's a scope specifier that does match some template 10109 // parameter lists, which we don't handle right now. 10110 } else { 10111 if (D.isFunctionDefinition()) { 10112 // C++ [class.friend]p6: 10113 // A function can be defined in a friend declaration of a class if and 10114 // only if the class is a non-local class (9.8), the function name is 10115 // unqualified, and the function has namespace scope. 10116 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10117 << SS.getScopeRep(); 10118 } 10119 10120 DC = CurContext; 10121 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10122 } 10123 10124 if (!DC->isRecord()) { 10125 // This implies that it has to be an operator or function. 10126 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10127 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10128 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10129 Diag(Loc, diag::err_introducing_special_friend) << 10130 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10131 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10132 return 0; 10133 } 10134 } 10135 10136 // FIXME: This is an egregious hack to cope with cases where the scope stack 10137 // does not contain the declaration context, i.e., in an out-of-line 10138 // definition of a class. 10139 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10140 if (!DCScope) { 10141 FakeDCScope.setEntity(DC); 10142 DCScope = &FakeDCScope; 10143 } 10144 10145 bool AddToScope = true; 10146 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10147 move(TemplateParams), AddToScope); 10148 if (!ND) return 0; 10149 10150 assert(ND->getDeclContext() == DC); 10151 assert(ND->getLexicalDeclContext() == CurContext); 10152 10153 // Add the function declaration to the appropriate lookup tables, 10154 // adjusting the redeclarations list as necessary. We don't 10155 // want to do this yet if the friending class is dependent. 10156 // 10157 // Also update the scope-based lookup if the target context's 10158 // lookup context is in lexical scope. 10159 if (!CurContext->isDependentContext()) { 10160 DC = DC->getRedeclContext(); 10161 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10162 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10163 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10164 } 10165 10166 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10167 D.getIdentifierLoc(), ND, 10168 DS.getFriendSpecLoc()); 10169 FrD->setAccess(AS_public); 10170 CurContext->addDecl(FrD); 10171 10172 if (ND->isInvalidDecl()) 10173 FrD->setInvalidDecl(); 10174 else { 10175 FunctionDecl *FD; 10176 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10177 FD = FTD->getTemplatedDecl(); 10178 else 10179 FD = cast<FunctionDecl>(ND); 10180 10181 // Mark templated-scope function declarations as unsupported. 10182 if (FD->getNumTemplateParameterLists()) 10183 FrD->setUnsupportedFriend(true); 10184 } 10185 10186 return ND; 10187} 10188 10189void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10190 AdjustDeclIfTemplate(Dcl); 10191 10192 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10193 if (!Fn) { 10194 Diag(DelLoc, diag::err_deleted_non_function); 10195 return; 10196 } 10197 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10198 Diag(DelLoc, diag::err_deleted_decl_not_first); 10199 Diag(Prev->getLocation(), diag::note_previous_declaration); 10200 // If the declaration wasn't the first, we delete the function anyway for 10201 // recovery. 10202 } 10203 Fn->setDeletedAsWritten(); 10204} 10205 10206void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10207 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10208 10209 if (MD) { 10210 if (MD->getParent()->isDependentType()) { 10211 MD->setDefaulted(); 10212 MD->setExplicitlyDefaulted(); 10213 return; 10214 } 10215 10216 CXXSpecialMember Member = getSpecialMember(MD); 10217 if (Member == CXXInvalid) { 10218 Diag(DefaultLoc, diag::err_default_special_members); 10219 return; 10220 } 10221 10222 MD->setDefaulted(); 10223 MD->setExplicitlyDefaulted(); 10224 10225 // If this definition appears within the record, do the checking when 10226 // the record is complete. 10227 const FunctionDecl *Primary = MD; 10228 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10229 // Find the uninstantiated declaration that actually had the '= default' 10230 // on it. 10231 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10232 10233 if (Primary == Primary->getCanonicalDecl()) 10234 return; 10235 10236 switch (Member) { 10237 case CXXDefaultConstructor: { 10238 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10239 CheckExplicitlyDefaultedDefaultConstructor(CD); 10240 if (!CD->isInvalidDecl()) 10241 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10242 break; 10243 } 10244 10245 case CXXCopyConstructor: { 10246 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10247 CheckExplicitlyDefaultedCopyConstructor(CD); 10248 if (!CD->isInvalidDecl()) 10249 DefineImplicitCopyConstructor(DefaultLoc, CD); 10250 break; 10251 } 10252 10253 case CXXCopyAssignment: { 10254 CheckExplicitlyDefaultedCopyAssignment(MD); 10255 if (!MD->isInvalidDecl()) 10256 DefineImplicitCopyAssignment(DefaultLoc, MD); 10257 break; 10258 } 10259 10260 case CXXDestructor: { 10261 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10262 CheckExplicitlyDefaultedDestructor(DD); 10263 if (!DD->isInvalidDecl()) 10264 DefineImplicitDestructor(DefaultLoc, DD); 10265 break; 10266 } 10267 10268 case CXXMoveConstructor: { 10269 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10270 CheckExplicitlyDefaultedMoveConstructor(CD); 10271 if (!CD->isInvalidDecl()) 10272 DefineImplicitMoveConstructor(DefaultLoc, CD); 10273 break; 10274 } 10275 10276 case CXXMoveAssignment: { 10277 CheckExplicitlyDefaultedMoveAssignment(MD); 10278 if (!MD->isInvalidDecl()) 10279 DefineImplicitMoveAssignment(DefaultLoc, MD); 10280 break; 10281 } 10282 10283 case CXXInvalid: 10284 llvm_unreachable("Invalid special member."); 10285 } 10286 } else { 10287 Diag(DefaultLoc, diag::err_default_special_members); 10288 } 10289} 10290 10291static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10292 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10293 Stmt *SubStmt = *CI; 10294 if (!SubStmt) 10295 continue; 10296 if (isa<ReturnStmt>(SubStmt)) 10297 Self.Diag(SubStmt->getSourceRange().getBegin(), 10298 diag::err_return_in_constructor_handler); 10299 if (!isa<Expr>(SubStmt)) 10300 SearchForReturnInStmt(Self, SubStmt); 10301 } 10302} 10303 10304void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10305 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10306 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10307 SearchForReturnInStmt(*this, Handler); 10308 } 10309} 10310 10311bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10312 const CXXMethodDecl *Old) { 10313 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10314 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10315 10316 if (Context.hasSameType(NewTy, OldTy) || 10317 NewTy->isDependentType() || OldTy->isDependentType()) 10318 return false; 10319 10320 // Check if the return types are covariant 10321 QualType NewClassTy, OldClassTy; 10322 10323 /// Both types must be pointers or references to classes. 10324 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10325 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10326 NewClassTy = NewPT->getPointeeType(); 10327 OldClassTy = OldPT->getPointeeType(); 10328 } 10329 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10330 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10331 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10332 NewClassTy = NewRT->getPointeeType(); 10333 OldClassTy = OldRT->getPointeeType(); 10334 } 10335 } 10336 } 10337 10338 // The return types aren't either both pointers or references to a class type. 10339 if (NewClassTy.isNull()) { 10340 Diag(New->getLocation(), 10341 diag::err_different_return_type_for_overriding_virtual_function) 10342 << New->getDeclName() << NewTy << OldTy; 10343 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10344 10345 return true; 10346 } 10347 10348 // C++ [class.virtual]p6: 10349 // If the return type of D::f differs from the return type of B::f, the 10350 // class type in the return type of D::f shall be complete at the point of 10351 // declaration of D::f or shall be the class type D. 10352 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10353 if (!RT->isBeingDefined() && 10354 RequireCompleteType(New->getLocation(), NewClassTy, 10355 PDiag(diag::err_covariant_return_incomplete) 10356 << New->getDeclName())) 10357 return true; 10358 } 10359 10360 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10361 // Check if the new class derives from the old class. 10362 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10363 Diag(New->getLocation(), 10364 diag::err_covariant_return_not_derived) 10365 << New->getDeclName() << NewTy << OldTy; 10366 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10367 return true; 10368 } 10369 10370 // Check if we the conversion from derived to base is valid. 10371 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10372 diag::err_covariant_return_inaccessible_base, 10373 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10374 // FIXME: Should this point to the return type? 10375 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10376 // FIXME: this note won't trigger for delayed access control 10377 // diagnostics, and it's impossible to get an undelayed error 10378 // here from access control during the original parse because 10379 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10380 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10381 return true; 10382 } 10383 } 10384 10385 // The qualifiers of the return types must be the same. 10386 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10387 Diag(New->getLocation(), 10388 diag::err_covariant_return_type_different_qualifications) 10389 << New->getDeclName() << NewTy << OldTy; 10390 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10391 return true; 10392 }; 10393 10394 10395 // The new class type must have the same or less qualifiers as the old type. 10396 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10397 Diag(New->getLocation(), 10398 diag::err_covariant_return_type_class_type_more_qualified) 10399 << New->getDeclName() << NewTy << OldTy; 10400 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10401 return true; 10402 }; 10403 10404 return false; 10405} 10406 10407/// \brief Mark the given method pure. 10408/// 10409/// \param Method the method to be marked pure. 10410/// 10411/// \param InitRange the source range that covers the "0" initializer. 10412bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10413 SourceLocation EndLoc = InitRange.getEnd(); 10414 if (EndLoc.isValid()) 10415 Method->setRangeEnd(EndLoc); 10416 10417 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10418 Method->setPure(); 10419 return false; 10420 } 10421 10422 if (!Method->isInvalidDecl()) 10423 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10424 << Method->getDeclName() << InitRange; 10425 return true; 10426} 10427 10428/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10429/// an initializer for the out-of-line declaration 'Dcl'. The scope 10430/// is a fresh scope pushed for just this purpose. 10431/// 10432/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10433/// static data member of class X, names should be looked up in the scope of 10434/// class X. 10435void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10436 // If there is no declaration, there was an error parsing it. 10437 if (D == 0 || D->isInvalidDecl()) return; 10438 10439 // We should only get called for declarations with scope specifiers, like: 10440 // int foo::bar; 10441 assert(D->isOutOfLine()); 10442 EnterDeclaratorContext(S, D->getDeclContext()); 10443} 10444 10445/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10446/// initializer for the out-of-line declaration 'D'. 10447void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10448 // If there is no declaration, there was an error parsing it. 10449 if (D == 0 || D->isInvalidDecl()) return; 10450 10451 assert(D->isOutOfLine()); 10452 ExitDeclaratorContext(S); 10453} 10454 10455/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10456/// C++ if/switch/while/for statement. 10457/// e.g: "if (int x = f()) {...}" 10458DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10459 // C++ 6.4p2: 10460 // The declarator shall not specify a function or an array. 10461 // The type-specifier-seq shall not contain typedef and shall not declare a 10462 // new class or enumeration. 10463 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10464 "Parser allowed 'typedef' as storage class of condition decl."); 10465 10466 Decl *Dcl = ActOnDeclarator(S, D); 10467 if (!Dcl) 10468 return true; 10469 10470 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10471 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10472 << D.getSourceRange(); 10473 return true; 10474 } 10475 10476 return Dcl; 10477} 10478 10479void Sema::LoadExternalVTableUses() { 10480 if (!ExternalSource) 10481 return; 10482 10483 SmallVector<ExternalVTableUse, 4> VTables; 10484 ExternalSource->ReadUsedVTables(VTables); 10485 SmallVector<VTableUse, 4> NewUses; 10486 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10487 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10488 = VTablesUsed.find(VTables[I].Record); 10489 // Even if a definition wasn't required before, it may be required now. 10490 if (Pos != VTablesUsed.end()) { 10491 if (!Pos->second && VTables[I].DefinitionRequired) 10492 Pos->second = true; 10493 continue; 10494 } 10495 10496 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10497 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10498 } 10499 10500 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10501} 10502 10503void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10504 bool DefinitionRequired) { 10505 // Ignore any vtable uses in unevaluated operands or for classes that do 10506 // not have a vtable. 10507 if (!Class->isDynamicClass() || Class->isDependentContext() || 10508 CurContext->isDependentContext() || 10509 ExprEvalContexts.back().Context == Unevaluated) 10510 return; 10511 10512 // Try to insert this class into the map. 10513 LoadExternalVTableUses(); 10514 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10515 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10516 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10517 if (!Pos.second) { 10518 // If we already had an entry, check to see if we are promoting this vtable 10519 // to required a definition. If so, we need to reappend to the VTableUses 10520 // list, since we may have already processed the first entry. 10521 if (DefinitionRequired && !Pos.first->second) { 10522 Pos.first->second = true; 10523 } else { 10524 // Otherwise, we can early exit. 10525 return; 10526 } 10527 } 10528 10529 // Local classes need to have their virtual members marked 10530 // immediately. For all other classes, we mark their virtual members 10531 // at the end of the translation unit. 10532 if (Class->isLocalClass()) 10533 MarkVirtualMembersReferenced(Loc, Class); 10534 else 10535 VTableUses.push_back(std::make_pair(Class, Loc)); 10536} 10537 10538bool Sema::DefineUsedVTables() { 10539 LoadExternalVTableUses(); 10540 if (VTableUses.empty()) 10541 return false; 10542 10543 // Note: The VTableUses vector could grow as a result of marking 10544 // the members of a class as "used", so we check the size each 10545 // time through the loop and prefer indices (with are stable) to 10546 // iterators (which are not). 10547 bool DefinedAnything = false; 10548 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10549 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10550 if (!Class) 10551 continue; 10552 10553 SourceLocation Loc = VTableUses[I].second; 10554 10555 // If this class has a key function, but that key function is 10556 // defined in another translation unit, we don't need to emit the 10557 // vtable even though we're using it. 10558 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10559 if (KeyFunction && !KeyFunction->hasBody()) { 10560 switch (KeyFunction->getTemplateSpecializationKind()) { 10561 case TSK_Undeclared: 10562 case TSK_ExplicitSpecialization: 10563 case TSK_ExplicitInstantiationDeclaration: 10564 // The key function is in another translation unit. 10565 continue; 10566 10567 case TSK_ExplicitInstantiationDefinition: 10568 case TSK_ImplicitInstantiation: 10569 // We will be instantiating the key function. 10570 break; 10571 } 10572 } else if (!KeyFunction) { 10573 // If we have a class with no key function that is the subject 10574 // of an explicit instantiation declaration, suppress the 10575 // vtable; it will live with the explicit instantiation 10576 // definition. 10577 bool IsExplicitInstantiationDeclaration 10578 = Class->getTemplateSpecializationKind() 10579 == TSK_ExplicitInstantiationDeclaration; 10580 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10581 REnd = Class->redecls_end(); 10582 R != REnd; ++R) { 10583 TemplateSpecializationKind TSK 10584 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10585 if (TSK == TSK_ExplicitInstantiationDeclaration) 10586 IsExplicitInstantiationDeclaration = true; 10587 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10588 IsExplicitInstantiationDeclaration = false; 10589 break; 10590 } 10591 } 10592 10593 if (IsExplicitInstantiationDeclaration) 10594 continue; 10595 } 10596 10597 // Mark all of the virtual members of this class as referenced, so 10598 // that we can build a vtable. Then, tell the AST consumer that a 10599 // vtable for this class is required. 10600 DefinedAnything = true; 10601 MarkVirtualMembersReferenced(Loc, Class); 10602 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10603 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10604 10605 // Optionally warn if we're emitting a weak vtable. 10606 if (Class->getLinkage() == ExternalLinkage && 10607 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10608 const FunctionDecl *KeyFunctionDef = 0; 10609 if (!KeyFunction || 10610 (KeyFunction->hasBody(KeyFunctionDef) && 10611 KeyFunctionDef->isInlined())) 10612 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10613 } 10614 } 10615 VTableUses.clear(); 10616 10617 return DefinedAnything; 10618} 10619 10620void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10621 const CXXRecordDecl *RD) { 10622 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10623 e = RD->method_end(); i != e; ++i) { 10624 CXXMethodDecl *MD = *i; 10625 10626 // C++ [basic.def.odr]p2: 10627 // [...] A virtual member function is used if it is not pure. [...] 10628 if (MD->isVirtual() && !MD->isPure()) 10629 MarkDeclarationReferenced(Loc, MD); 10630 } 10631 10632 // Only classes that have virtual bases need a VTT. 10633 if (RD->getNumVBases() == 0) 10634 return; 10635 10636 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10637 e = RD->bases_end(); i != e; ++i) { 10638 const CXXRecordDecl *Base = 10639 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10640 if (Base->getNumVBases() == 0) 10641 continue; 10642 MarkVirtualMembersReferenced(Loc, Base); 10643 } 10644} 10645 10646/// SetIvarInitializers - This routine builds initialization ASTs for the 10647/// Objective-C implementation whose ivars need be initialized. 10648void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10649 if (!getLangOptions().CPlusPlus) 10650 return; 10651 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10652 SmallVector<ObjCIvarDecl*, 8> ivars; 10653 CollectIvarsToConstructOrDestruct(OID, ivars); 10654 if (ivars.empty()) 10655 return; 10656 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10657 for (unsigned i = 0; i < ivars.size(); i++) { 10658 FieldDecl *Field = ivars[i]; 10659 if (Field->isInvalidDecl()) 10660 continue; 10661 10662 CXXCtorInitializer *Member; 10663 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10664 InitializationKind InitKind = 10665 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10666 10667 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10668 ExprResult MemberInit = 10669 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10670 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10671 // Note, MemberInit could actually come back empty if no initialization 10672 // is required (e.g., because it would call a trivial default constructor) 10673 if (!MemberInit.get() || MemberInit.isInvalid()) 10674 continue; 10675 10676 Member = 10677 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10678 SourceLocation(), 10679 MemberInit.takeAs<Expr>(), 10680 SourceLocation()); 10681 AllToInit.push_back(Member); 10682 10683 // Be sure that the destructor is accessible and is marked as referenced. 10684 if (const RecordType *RecordTy 10685 = Context.getBaseElementType(Field->getType()) 10686 ->getAs<RecordType>()) { 10687 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10688 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10689 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10690 CheckDestructorAccess(Field->getLocation(), Destructor, 10691 PDiag(diag::err_access_dtor_ivar) 10692 << Context.getBaseElementType(Field->getType())); 10693 } 10694 } 10695 } 10696 ObjCImplementation->setIvarInitializers(Context, 10697 AllToInit.data(), AllToInit.size()); 10698 } 10699} 10700 10701static 10702void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10703 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10704 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10705 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10706 Sema &S) { 10707 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10708 CE = Current.end(); 10709 if (Ctor->isInvalidDecl()) 10710 return; 10711 10712 const FunctionDecl *FNTarget = 0; 10713 CXXConstructorDecl *Target; 10714 10715 // We ignore the result here since if we don't have a body, Target will be 10716 // null below. 10717 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10718 Target 10719= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10720 10721 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10722 // Avoid dereferencing a null pointer here. 10723 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10724 10725 if (!Current.insert(Canonical)) 10726 return; 10727 10728 // We know that beyond here, we aren't chaining into a cycle. 10729 if (!Target || !Target->isDelegatingConstructor() || 10730 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10731 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10732 Valid.insert(*CI); 10733 Current.clear(); 10734 // We've hit a cycle. 10735 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10736 Current.count(TCanonical)) { 10737 // If we haven't diagnosed this cycle yet, do so now. 10738 if (!Invalid.count(TCanonical)) { 10739 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10740 diag::warn_delegating_ctor_cycle) 10741 << Ctor; 10742 10743 // Don't add a note for a function delegating directo to itself. 10744 if (TCanonical != Canonical) 10745 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10746 10747 CXXConstructorDecl *C = Target; 10748 while (C->getCanonicalDecl() != Canonical) { 10749 (void)C->getTargetConstructor()->hasBody(FNTarget); 10750 assert(FNTarget && "Ctor cycle through bodiless function"); 10751 10752 C 10753 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10754 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10755 } 10756 } 10757 10758 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10759 Invalid.insert(*CI); 10760 Current.clear(); 10761 } else { 10762 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10763 } 10764} 10765 10766 10767void Sema::CheckDelegatingCtorCycles() { 10768 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10769 10770 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10771 CE = Current.end(); 10772 10773 for (DelegatingCtorDeclsType::iterator 10774 I = DelegatingCtorDecls.begin(ExternalSource), 10775 E = DelegatingCtorDecls.end(); 10776 I != E; ++I) { 10777 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10778 } 10779 10780 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10781 (*CI)->setInvalidDecl(); 10782} 10783 10784/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10785Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10786 // Implicitly declared functions (e.g. copy constructors) are 10787 // __host__ __device__ 10788 if (D->isImplicit()) 10789 return CFT_HostDevice; 10790 10791 if (D->hasAttr<CUDAGlobalAttr>()) 10792 return CFT_Global; 10793 10794 if (D->hasAttr<CUDADeviceAttr>()) { 10795 if (D->hasAttr<CUDAHostAttr>()) 10796 return CFT_HostDevice; 10797 else 10798 return CFT_Device; 10799 } 10800 10801 return CFT_Host; 10802} 10803 10804bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10805 CUDAFunctionTarget CalleeTarget) { 10806 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10807 // Callable from the device only." 10808 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10809 return true; 10810 10811 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10812 // Callable from the host only." 10813 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10814 // Callable from the host only." 10815 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10816 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10817 return true; 10818 10819 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10820 return true; 10821 10822 return false; 10823} 10824