SemaDeclCXX.cpp revision cb8f951deacd251d9b3a73dc65f341477e039de1
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 } 1155 } 1156 1157 // Attach the remaining base class specifiers to the derived class. 1158 Class->setBases(Bases, NumGoodBases); 1159 1160 // Delete the remaining (good) base class specifiers, since their 1161 // data has been copied into the CXXRecordDecl. 1162 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1163 Context.Deallocate(Bases[idx]); 1164 1165 return Invalid; 1166} 1167 1168/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1169/// class, after checking whether there are any duplicate base 1170/// classes. 1171void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1172 unsigned NumBases) { 1173 if (!ClassDecl || !Bases || !NumBases) 1174 return; 1175 1176 AdjustDeclIfTemplate(ClassDecl); 1177 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1178 (CXXBaseSpecifier**)(Bases), NumBases); 1179} 1180 1181static CXXRecordDecl *GetClassForType(QualType T) { 1182 if (const RecordType *RT = T->getAs<RecordType>()) 1183 return cast<CXXRecordDecl>(RT->getDecl()); 1184 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1185 return ICT->getDecl(); 1186 else 1187 return 0; 1188} 1189 1190/// \brief Determine whether the type \p Derived is a C++ class that is 1191/// derived from the type \p Base. 1192bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1193 if (!getLangOptions().CPlusPlus) 1194 return false; 1195 1196 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1197 if (!DerivedRD) 1198 return false; 1199 1200 CXXRecordDecl *BaseRD = GetClassForType(Base); 1201 if (!BaseRD) 1202 return false; 1203 1204 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1205 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1211 if (!getLangOptions().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1223} 1224 1225void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1226 CXXCastPath &BasePathArray) { 1227 assert(BasePathArray.empty() && "Base path array must be empty!"); 1228 assert(Paths.isRecordingPaths() && "Must record paths!"); 1229 1230 const CXXBasePath &Path = Paths.front(); 1231 1232 // We first go backward and check if we have a virtual base. 1233 // FIXME: It would be better if CXXBasePath had the base specifier for 1234 // the nearest virtual base. 1235 unsigned Start = 0; 1236 for (unsigned I = Path.size(); I != 0; --I) { 1237 if (Path[I - 1].Base->isVirtual()) { 1238 Start = I - 1; 1239 break; 1240 } 1241 } 1242 1243 // Now add all bases. 1244 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1245 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1246} 1247 1248/// \brief Determine whether the given base path includes a virtual 1249/// base class. 1250bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1251 for (CXXCastPath::const_iterator B = BasePath.begin(), 1252 BEnd = BasePath.end(); 1253 B != BEnd; ++B) 1254 if ((*B)->isVirtual()) 1255 return true; 1256 1257 return false; 1258} 1259 1260/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1261/// conversion (where Derived and Base are class types) is 1262/// well-formed, meaning that the conversion is unambiguous (and 1263/// that all of the base classes are accessible). Returns true 1264/// and emits a diagnostic if the code is ill-formed, returns false 1265/// otherwise. Loc is the location where this routine should point to 1266/// if there is an error, and Range is the source range to highlight 1267/// if there is an error. 1268bool 1269Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1270 unsigned InaccessibleBaseID, 1271 unsigned AmbigiousBaseConvID, 1272 SourceLocation Loc, SourceRange Range, 1273 DeclarationName Name, 1274 CXXCastPath *BasePath) { 1275 // First, determine whether the path from Derived to Base is 1276 // ambiguous. This is slightly more expensive than checking whether 1277 // the Derived to Base conversion exists, because here we need to 1278 // explore multiple paths to determine if there is an ambiguity. 1279 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1280 /*DetectVirtual=*/false); 1281 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1282 assert(DerivationOkay && 1283 "Can only be used with a derived-to-base conversion"); 1284 (void)DerivationOkay; 1285 1286 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1287 if (InaccessibleBaseID) { 1288 // Check that the base class can be accessed. 1289 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1290 InaccessibleBaseID)) { 1291 case AR_inaccessible: 1292 return true; 1293 case AR_accessible: 1294 case AR_dependent: 1295 case AR_delayed: 1296 break; 1297 } 1298 } 1299 1300 // Build a base path if necessary. 1301 if (BasePath) 1302 BuildBasePathArray(Paths, *BasePath); 1303 return false; 1304 } 1305 1306 // We know that the derived-to-base conversion is ambiguous, and 1307 // we're going to produce a diagnostic. Perform the derived-to-base 1308 // search just one more time to compute all of the possible paths so 1309 // that we can print them out. This is more expensive than any of 1310 // the previous derived-to-base checks we've done, but at this point 1311 // performance isn't as much of an issue. 1312 Paths.clear(); 1313 Paths.setRecordingPaths(true); 1314 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1315 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1316 (void)StillOkay; 1317 1318 // Build up a textual representation of the ambiguous paths, e.g., 1319 // D -> B -> A, that will be used to illustrate the ambiguous 1320 // conversions in the diagnostic. We only print one of the paths 1321 // to each base class subobject. 1322 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1323 1324 Diag(Loc, AmbigiousBaseConvID) 1325 << Derived << Base << PathDisplayStr << Range << Name; 1326 return true; 1327} 1328 1329bool 1330Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1331 SourceLocation Loc, SourceRange Range, 1332 CXXCastPath *BasePath, 1333 bool IgnoreAccess) { 1334 return CheckDerivedToBaseConversion(Derived, Base, 1335 IgnoreAccess ? 0 1336 : diag::err_upcast_to_inaccessible_base, 1337 diag::err_ambiguous_derived_to_base_conv, 1338 Loc, Range, DeclarationName(), 1339 BasePath); 1340} 1341 1342 1343/// @brief Builds a string representing ambiguous paths from a 1344/// specific derived class to different subobjects of the same base 1345/// class. 1346/// 1347/// This function builds a string that can be used in error messages 1348/// to show the different paths that one can take through the 1349/// inheritance hierarchy to go from the derived class to different 1350/// subobjects of a base class. The result looks something like this: 1351/// @code 1352/// struct D -> struct B -> struct A 1353/// struct D -> struct C -> struct A 1354/// @endcode 1355std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1356 std::string PathDisplayStr; 1357 std::set<unsigned> DisplayedPaths; 1358 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1359 Path != Paths.end(); ++Path) { 1360 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1361 // We haven't displayed a path to this particular base 1362 // class subobject yet. 1363 PathDisplayStr += "\n "; 1364 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1365 for (CXXBasePath::const_iterator Element = Path->begin(); 1366 Element != Path->end(); ++Element) 1367 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1368 } 1369 } 1370 1371 return PathDisplayStr; 1372} 1373 1374//===----------------------------------------------------------------------===// 1375// C++ class member Handling 1376//===----------------------------------------------------------------------===// 1377 1378/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1379bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1380 SourceLocation ASLoc, 1381 SourceLocation ColonLoc, 1382 AttributeList *Attrs) { 1383 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1384 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1385 ASLoc, ColonLoc); 1386 CurContext->addHiddenDecl(ASDecl); 1387 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1388} 1389 1390/// CheckOverrideControl - Check C++0x override control semantics. 1391void Sema::CheckOverrideControl(const Decl *D) { 1392 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1393 if (!MD || !MD->isVirtual()) 1394 return; 1395 1396 if (MD->isDependentContext()) 1397 return; 1398 1399 // C++0x [class.virtual]p3: 1400 // If a virtual function is marked with the virt-specifier override and does 1401 // not override a member function of a base class, 1402 // the program is ill-formed. 1403 bool HasOverriddenMethods = 1404 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1405 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1406 Diag(MD->getLocation(), 1407 diag::err_function_marked_override_not_overriding) 1408 << MD->getDeclName(); 1409 return; 1410 } 1411} 1412 1413/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1414/// function overrides a virtual member function marked 'final', according to 1415/// C++0x [class.virtual]p3. 1416bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1417 const CXXMethodDecl *Old) { 1418 if (!Old->hasAttr<FinalAttr>()) 1419 return false; 1420 1421 Diag(New->getLocation(), diag::err_final_function_overridden) 1422 << New->getDeclName(); 1423 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1424 return true; 1425} 1426 1427/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1428/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1429/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1430/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1431/// present but parsing it has been deferred. 1432Decl * 1433Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1434 MultiTemplateParamsArg TemplateParameterLists, 1435 Expr *BW, const VirtSpecifiers &VS, 1436 bool HasDeferredInit) { 1437 const DeclSpec &DS = D.getDeclSpec(); 1438 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1439 DeclarationName Name = NameInfo.getName(); 1440 SourceLocation Loc = NameInfo.getLoc(); 1441 1442 // For anonymous bitfields, the location should point to the type. 1443 if (Loc.isInvalid()) 1444 Loc = D.getSourceRange().getBegin(); 1445 1446 Expr *BitWidth = static_cast<Expr*>(BW); 1447 1448 assert(isa<CXXRecordDecl>(CurContext)); 1449 assert(!DS.isFriendSpecified()); 1450 1451 bool isFunc = D.isDeclarationOfFunction(); 1452 1453 // C++ 9.2p6: A member shall not be declared to have automatic storage 1454 // duration (auto, register) or with the extern storage-class-specifier. 1455 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1456 // data members and cannot be applied to names declared const or static, 1457 // and cannot be applied to reference members. 1458 switch (DS.getStorageClassSpec()) { 1459 case DeclSpec::SCS_unspecified: 1460 case DeclSpec::SCS_typedef: 1461 case DeclSpec::SCS_static: 1462 // FALL THROUGH. 1463 break; 1464 case DeclSpec::SCS_mutable: 1465 if (isFunc) { 1466 if (DS.getStorageClassSpecLoc().isValid()) 1467 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1468 else 1469 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1470 1471 // FIXME: It would be nicer if the keyword was ignored only for this 1472 // declarator. Otherwise we could get follow-up errors. 1473 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1474 } 1475 break; 1476 default: 1477 if (DS.getStorageClassSpecLoc().isValid()) 1478 Diag(DS.getStorageClassSpecLoc(), 1479 diag::err_storageclass_invalid_for_member); 1480 else 1481 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1482 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1483 } 1484 1485 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1486 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1487 !isFunc); 1488 1489 Decl *Member; 1490 if (isInstField) { 1491 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1492 1493 // Data members must have identifiers for names. 1494 if (Name.getNameKind() != DeclarationName::Identifier) { 1495 Diag(Loc, diag::err_bad_variable_name) 1496 << Name; 1497 return 0; 1498 } 1499 1500 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1501 1502 // Member field could not be with "template" keyword. 1503 // So TemplateParameterLists should be empty in this case. 1504 if (TemplateParameterLists.size()) { 1505 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1506 if (TemplateParams->size()) { 1507 // There is no such thing as a member field template. 1508 Diag(D.getIdentifierLoc(), diag::err_template_member) 1509 << II 1510 << SourceRange(TemplateParams->getTemplateLoc(), 1511 TemplateParams->getRAngleLoc()); 1512 } else { 1513 // There is an extraneous 'template<>' for this member. 1514 Diag(TemplateParams->getTemplateLoc(), 1515 diag::err_template_member_noparams) 1516 << II 1517 << SourceRange(TemplateParams->getTemplateLoc(), 1518 TemplateParams->getRAngleLoc()); 1519 } 1520 return 0; 1521 } 1522 1523 if (SS.isSet() && !SS.isInvalid()) { 1524 // The user provided a superfluous scope specifier inside a class 1525 // definition: 1526 // 1527 // class X { 1528 // int X::member; 1529 // }; 1530 DeclContext *DC = 0; 1531 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1532 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1533 << Name << FixItHint::CreateRemoval(SS.getRange()); 1534 else 1535 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1536 << Name << SS.getRange(); 1537 1538 SS.clear(); 1539 } 1540 1541 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1542 HasDeferredInit, AS); 1543 assert(Member && "HandleField never returns null"); 1544 } else { 1545 assert(!HasDeferredInit); 1546 1547 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1548 if (!Member) { 1549 return 0; 1550 } 1551 1552 // Non-instance-fields can't have a bitfield. 1553 if (BitWidth) { 1554 if (Member->isInvalidDecl()) { 1555 // don't emit another diagnostic. 1556 } else if (isa<VarDecl>(Member)) { 1557 // C++ 9.6p3: A bit-field shall not be a static member. 1558 // "static member 'A' cannot be a bit-field" 1559 Diag(Loc, diag::err_static_not_bitfield) 1560 << Name << BitWidth->getSourceRange(); 1561 } else if (isa<TypedefDecl>(Member)) { 1562 // "typedef member 'x' cannot be a bit-field" 1563 Diag(Loc, diag::err_typedef_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else { 1566 // A function typedef ("typedef int f(); f a;"). 1567 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1568 Diag(Loc, diag::err_not_integral_type_bitfield) 1569 << Name << cast<ValueDecl>(Member)->getType() 1570 << BitWidth->getSourceRange(); 1571 } 1572 1573 BitWidth = 0; 1574 Member->setInvalidDecl(); 1575 } 1576 1577 Member->setAccess(AS); 1578 1579 // If we have declared a member function template, set the access of the 1580 // templated declaration as well. 1581 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1582 FunTmpl->getTemplatedDecl()->setAccess(AS); 1583 } 1584 1585 if (VS.isOverrideSpecified()) { 1586 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1587 if (!MD || !MD->isVirtual()) { 1588 Diag(Member->getLocStart(), 1589 diag::override_keyword_only_allowed_on_virtual_member_functions) 1590 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1591 } else 1592 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1593 } 1594 if (VS.isFinalSpecified()) { 1595 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1596 if (!MD || !MD->isVirtual()) { 1597 Diag(Member->getLocStart(), 1598 diag::override_keyword_only_allowed_on_virtual_member_functions) 1599 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1600 } else 1601 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1602 } 1603 1604 if (VS.getLastLocation().isValid()) { 1605 // Update the end location of a method that has a virt-specifiers. 1606 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1607 MD->setRangeEnd(VS.getLastLocation()); 1608 } 1609 1610 CheckOverrideControl(Member); 1611 1612 assert((Name || isInstField) && "No identifier for non-field ?"); 1613 1614 if (isInstField) 1615 FieldCollector->Add(cast<FieldDecl>(Member)); 1616 return Member; 1617} 1618 1619/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1620/// in-class initializer for a non-static C++ class member, and after 1621/// instantiating an in-class initializer in a class template. Such actions 1622/// are deferred until the class is complete. 1623void 1624Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1625 Expr *InitExpr) { 1626 FieldDecl *FD = cast<FieldDecl>(D); 1627 1628 if (!InitExpr) { 1629 FD->setInvalidDecl(); 1630 FD->removeInClassInitializer(); 1631 return; 1632 } 1633 1634 ExprResult Init = InitExpr; 1635 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1636 // FIXME: if there is no EqualLoc, this is list-initialization. 1637 Init = PerformCopyInitialization( 1638 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1639 if (Init.isInvalid()) { 1640 FD->setInvalidDecl(); 1641 return; 1642 } 1643 1644 CheckImplicitConversions(Init.get(), EqualLoc); 1645 } 1646 1647 // C++0x [class.base.init]p7: 1648 // The initialization of each base and member constitutes a 1649 // full-expression. 1650 Init = MaybeCreateExprWithCleanups(Init); 1651 if (Init.isInvalid()) { 1652 FD->setInvalidDecl(); 1653 return; 1654 } 1655 1656 InitExpr = Init.release(); 1657 1658 FD->setInClassInitializer(InitExpr); 1659} 1660 1661/// \brief Find the direct and/or virtual base specifiers that 1662/// correspond to the given base type, for use in base initialization 1663/// within a constructor. 1664static bool FindBaseInitializer(Sema &SemaRef, 1665 CXXRecordDecl *ClassDecl, 1666 QualType BaseType, 1667 const CXXBaseSpecifier *&DirectBaseSpec, 1668 const CXXBaseSpecifier *&VirtualBaseSpec) { 1669 // First, check for a direct base class. 1670 DirectBaseSpec = 0; 1671 for (CXXRecordDecl::base_class_const_iterator Base 1672 = ClassDecl->bases_begin(); 1673 Base != ClassDecl->bases_end(); ++Base) { 1674 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1675 // We found a direct base of this type. That's what we're 1676 // initializing. 1677 DirectBaseSpec = &*Base; 1678 break; 1679 } 1680 } 1681 1682 // Check for a virtual base class. 1683 // FIXME: We might be able to short-circuit this if we know in advance that 1684 // there are no virtual bases. 1685 VirtualBaseSpec = 0; 1686 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1687 // We haven't found a base yet; search the class hierarchy for a 1688 // virtual base class. 1689 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1690 /*DetectVirtual=*/false); 1691 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1692 BaseType, Paths)) { 1693 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1694 Path != Paths.end(); ++Path) { 1695 if (Path->back().Base->isVirtual()) { 1696 VirtualBaseSpec = Path->back().Base; 1697 break; 1698 } 1699 } 1700 } 1701 } 1702 1703 return DirectBaseSpec || VirtualBaseSpec; 1704} 1705 1706/// \brief Handle a C++ member initializer using braced-init-list syntax. 1707MemInitResult 1708Sema::ActOnMemInitializer(Decl *ConstructorD, 1709 Scope *S, 1710 CXXScopeSpec &SS, 1711 IdentifierInfo *MemberOrBase, 1712 ParsedType TemplateTypeTy, 1713 SourceLocation IdLoc, 1714 Expr *InitList, 1715 SourceLocation EllipsisLoc) { 1716 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1717 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1718} 1719 1720/// \brief Handle a C++ member initializer using parentheses syntax. 1721MemInitResult 1722Sema::ActOnMemInitializer(Decl *ConstructorD, 1723 Scope *S, 1724 CXXScopeSpec &SS, 1725 IdentifierInfo *MemberOrBase, 1726 ParsedType TemplateTypeTy, 1727 SourceLocation IdLoc, 1728 SourceLocation LParenLoc, 1729 Expr **Args, unsigned NumArgs, 1730 SourceLocation RParenLoc, 1731 SourceLocation EllipsisLoc) { 1732 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1733 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1734 RParenLoc), 1735 EllipsisLoc); 1736} 1737 1738/// \brief Handle a C++ member initializer. 1739MemInitResult 1740Sema::BuildMemInitializer(Decl *ConstructorD, 1741 Scope *S, 1742 CXXScopeSpec &SS, 1743 IdentifierInfo *MemberOrBase, 1744 ParsedType TemplateTypeTy, 1745 SourceLocation IdLoc, 1746 const MultiInitializer &Args, 1747 SourceLocation EllipsisLoc) { 1748 if (!ConstructorD) 1749 return true; 1750 1751 AdjustDeclIfTemplate(ConstructorD); 1752 1753 CXXConstructorDecl *Constructor 1754 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1755 if (!Constructor) { 1756 // The user wrote a constructor initializer on a function that is 1757 // not a C++ constructor. Ignore the error for now, because we may 1758 // have more member initializers coming; we'll diagnose it just 1759 // once in ActOnMemInitializers. 1760 return true; 1761 } 1762 1763 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1764 1765 // C++ [class.base.init]p2: 1766 // Names in a mem-initializer-id are looked up in the scope of the 1767 // constructor's class and, if not found in that scope, are looked 1768 // up in the scope containing the constructor's definition. 1769 // [Note: if the constructor's class contains a member with the 1770 // same name as a direct or virtual base class of the class, a 1771 // mem-initializer-id naming the member or base class and composed 1772 // of a single identifier refers to the class member. A 1773 // mem-initializer-id for the hidden base class may be specified 1774 // using a qualified name. ] 1775 if (!SS.getScopeRep() && !TemplateTypeTy) { 1776 // Look for a member, first. 1777 FieldDecl *Member = 0; 1778 DeclContext::lookup_result Result 1779 = ClassDecl->lookup(MemberOrBase); 1780 if (Result.first != Result.second) { 1781 Member = dyn_cast<FieldDecl>(*Result.first); 1782 1783 if (Member) { 1784 if (EllipsisLoc.isValid()) 1785 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1786 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1787 1788 return BuildMemberInitializer(Member, Args, IdLoc); 1789 } 1790 1791 // Handle anonymous union case. 1792 if (IndirectFieldDecl* IndirectField 1793 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1794 if (EllipsisLoc.isValid()) 1795 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1796 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1797 1798 return BuildMemberInitializer(IndirectField, Args, IdLoc); 1799 } 1800 } 1801 } 1802 // It didn't name a member, so see if it names a class. 1803 QualType BaseType; 1804 TypeSourceInfo *TInfo = 0; 1805 1806 if (TemplateTypeTy) { 1807 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1808 } else { 1809 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1810 LookupParsedName(R, S, &SS); 1811 1812 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1813 if (!TyD) { 1814 if (R.isAmbiguous()) return true; 1815 1816 // We don't want access-control diagnostics here. 1817 R.suppressDiagnostics(); 1818 1819 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1820 bool NotUnknownSpecialization = false; 1821 DeclContext *DC = computeDeclContext(SS, false); 1822 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1823 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1824 1825 if (!NotUnknownSpecialization) { 1826 // When the scope specifier can refer to a member of an unknown 1827 // specialization, we take it as a type name. 1828 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1829 SS.getWithLocInContext(Context), 1830 *MemberOrBase, IdLoc); 1831 if (BaseType.isNull()) 1832 return true; 1833 1834 R.clear(); 1835 R.setLookupName(MemberOrBase); 1836 } 1837 } 1838 1839 // If no results were found, try to correct typos. 1840 TypoCorrection Corr; 1841 if (R.empty() && BaseType.isNull() && 1842 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1843 ClassDecl, false, CTC_NoKeywords))) { 1844 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1845 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1846 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1847 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1848 // We have found a non-static data member with a similar 1849 // name to what was typed; complain and initialize that 1850 // member. 1851 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1852 << MemberOrBase << true << CorrectedQuotedStr 1853 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1854 Diag(Member->getLocation(), diag::note_previous_decl) 1855 << CorrectedQuotedStr; 1856 1857 return BuildMemberInitializer(Member, Args, IdLoc); 1858 } 1859 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1860 const CXXBaseSpecifier *DirectBaseSpec; 1861 const CXXBaseSpecifier *VirtualBaseSpec; 1862 if (FindBaseInitializer(*this, ClassDecl, 1863 Context.getTypeDeclType(Type), 1864 DirectBaseSpec, VirtualBaseSpec)) { 1865 // We have found a direct or virtual base class with a 1866 // similar name to what was typed; complain and initialize 1867 // that base class. 1868 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1869 << MemberOrBase << false << CorrectedQuotedStr 1870 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1871 1872 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1873 : VirtualBaseSpec; 1874 Diag(BaseSpec->getSourceRange().getBegin(), 1875 diag::note_base_class_specified_here) 1876 << BaseSpec->getType() 1877 << BaseSpec->getSourceRange(); 1878 1879 TyD = Type; 1880 } 1881 } 1882 } 1883 1884 if (!TyD && BaseType.isNull()) { 1885 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1886 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1887 return true; 1888 } 1889 } 1890 1891 if (BaseType.isNull()) { 1892 BaseType = Context.getTypeDeclType(TyD); 1893 if (SS.isSet()) { 1894 NestedNameSpecifier *Qualifier = 1895 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1896 1897 // FIXME: preserve source range information 1898 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1899 } 1900 } 1901 } 1902 1903 if (!TInfo) 1904 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1905 1906 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1907} 1908 1909/// Checks a member initializer expression for cases where reference (or 1910/// pointer) members are bound to by-value parameters (or their addresses). 1911static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1912 Expr *Init, 1913 SourceLocation IdLoc) { 1914 QualType MemberTy = Member->getType(); 1915 1916 // We only handle pointers and references currently. 1917 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1918 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1919 return; 1920 1921 const bool IsPointer = MemberTy->isPointerType(); 1922 if (IsPointer) { 1923 if (const UnaryOperator *Op 1924 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1925 // The only case we're worried about with pointers requires taking the 1926 // address. 1927 if (Op->getOpcode() != UO_AddrOf) 1928 return; 1929 1930 Init = Op->getSubExpr(); 1931 } else { 1932 // We only handle address-of expression initializers for pointers. 1933 return; 1934 } 1935 } 1936 1937 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1938 // Taking the address of a temporary will be diagnosed as a hard error. 1939 if (IsPointer) 1940 return; 1941 1942 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1943 << Member << Init->getSourceRange(); 1944 } else if (const DeclRefExpr *DRE 1945 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1946 // We only warn when referring to a non-reference parameter declaration. 1947 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1948 if (!Parameter || Parameter->getType()->isReferenceType()) 1949 return; 1950 1951 S.Diag(Init->getExprLoc(), 1952 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1953 : diag::warn_bind_ref_member_to_parameter) 1954 << Member << Parameter << Init->getSourceRange(); 1955 } else { 1956 // Other initializers are fine. 1957 return; 1958 } 1959 1960 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1961 << (unsigned)IsPointer; 1962} 1963 1964/// Checks an initializer expression for use of uninitialized fields, such as 1965/// containing the field that is being initialized. Returns true if there is an 1966/// uninitialized field was used an updates the SourceLocation parameter; false 1967/// otherwise. 1968static bool InitExprContainsUninitializedFields(const Stmt *S, 1969 const ValueDecl *LhsField, 1970 SourceLocation *L) { 1971 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1972 1973 if (isa<CallExpr>(S)) { 1974 // Do not descend into function calls or constructors, as the use 1975 // of an uninitialized field may be valid. One would have to inspect 1976 // the contents of the function/ctor to determine if it is safe or not. 1977 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1978 // may be safe, depending on what the function/ctor does. 1979 return false; 1980 } 1981 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1982 const NamedDecl *RhsField = ME->getMemberDecl(); 1983 1984 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1985 // The member expression points to a static data member. 1986 assert(VD->isStaticDataMember() && 1987 "Member points to non-static data member!"); 1988 (void)VD; 1989 return false; 1990 } 1991 1992 if (isa<EnumConstantDecl>(RhsField)) { 1993 // The member expression points to an enum. 1994 return false; 1995 } 1996 1997 if (RhsField == LhsField) { 1998 // Initializing a field with itself. Throw a warning. 1999 // But wait; there are exceptions! 2000 // Exception #1: The field may not belong to this record. 2001 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2002 const Expr *base = ME->getBase(); 2003 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2004 // Even though the field matches, it does not belong to this record. 2005 return false; 2006 } 2007 // None of the exceptions triggered; return true to indicate an 2008 // uninitialized field was used. 2009 *L = ME->getMemberLoc(); 2010 return true; 2011 } 2012 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2013 // sizeof/alignof doesn't reference contents, do not warn. 2014 return false; 2015 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2016 // address-of doesn't reference contents (the pointer may be dereferenced 2017 // in the same expression but it would be rare; and weird). 2018 if (UOE->getOpcode() == UO_AddrOf) 2019 return false; 2020 } 2021 for (Stmt::const_child_range it = S->children(); it; ++it) { 2022 if (!*it) { 2023 // An expression such as 'member(arg ?: "")' may trigger this. 2024 continue; 2025 } 2026 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2027 return true; 2028 } 2029 return false; 2030} 2031 2032MemInitResult 2033Sema::BuildMemberInitializer(ValueDecl *Member, 2034 const MultiInitializer &Args, 2035 SourceLocation IdLoc) { 2036 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2037 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2038 assert((DirectMember || IndirectMember) && 2039 "Member must be a FieldDecl or IndirectFieldDecl"); 2040 2041 if (Member->isInvalidDecl()) 2042 return true; 2043 2044 // Diagnose value-uses of fields to initialize themselves, e.g. 2045 // foo(foo) 2046 // where foo is not also a parameter to the constructor. 2047 // TODO: implement -Wuninitialized and fold this into that framework. 2048 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2049 I != E; ++I) { 2050 SourceLocation L; 2051 Expr *Arg = *I; 2052 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2053 Arg = DIE->getInit(); 2054 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2055 // FIXME: Return true in the case when other fields are used before being 2056 // uninitialized. For example, let this field be the i'th field. When 2057 // initializing the i'th field, throw a warning if any of the >= i'th 2058 // fields are used, as they are not yet initialized. 2059 // Right now we are only handling the case where the i'th field uses 2060 // itself in its initializer. 2061 Diag(L, diag::warn_field_is_uninit); 2062 } 2063 } 2064 2065 bool HasDependentArg = Args.isTypeDependent(); 2066 2067 Expr *Init; 2068 if (Member->getType()->isDependentType() || HasDependentArg) { 2069 // Can't check initialization for a member of dependent type or when 2070 // any of the arguments are type-dependent expressions. 2071 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2072 2073 DiscardCleanupsInEvaluationContext(); 2074 } else { 2075 // Initialize the member. 2076 InitializedEntity MemberEntity = 2077 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2078 : InitializedEntity::InitializeMember(IndirectMember, 0); 2079 InitializationKind Kind = 2080 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2081 Args.getEndLoc()); 2082 2083 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2084 if (MemberInit.isInvalid()) 2085 return true; 2086 2087 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2088 2089 // C++0x [class.base.init]p7: 2090 // The initialization of each base and member constitutes a 2091 // full-expression. 2092 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2093 if (MemberInit.isInvalid()) 2094 return true; 2095 2096 // If we are in a dependent context, template instantiation will 2097 // perform this type-checking again. Just save the arguments that we 2098 // received in a ParenListExpr. 2099 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2100 // of the information that we have about the member 2101 // initializer. However, deconstructing the ASTs is a dicey process, 2102 // and this approach is far more likely to get the corner cases right. 2103 if (CurContext->isDependentContext()) { 2104 Init = Args.CreateInitExpr(Context, 2105 Member->getType().getNonReferenceType()); 2106 } else { 2107 Init = MemberInit.get(); 2108 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2109 } 2110 } 2111 2112 if (DirectMember) { 2113 return new (Context) CXXCtorInitializer(Context, DirectMember, 2114 IdLoc, Args.getStartLoc(), 2115 Init, Args.getEndLoc()); 2116 } else { 2117 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2118 IdLoc, Args.getStartLoc(), 2119 Init, Args.getEndLoc()); 2120 } 2121} 2122 2123MemInitResult 2124Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2125 const MultiInitializer &Args, 2126 SourceLocation NameLoc, 2127 CXXRecordDecl *ClassDecl) { 2128 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2129 if (!LangOpts.CPlusPlus0x) 2130 return Diag(Loc, diag::err_delegating_ctor) 2131 << TInfo->getTypeLoc().getLocalSourceRange(); 2132 Diag(Loc, diag::warn_cxx98_compat_delegating_ctor); 2133 2134 // Initialize the object. 2135 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2136 QualType(ClassDecl->getTypeForDecl(), 0)); 2137 InitializationKind Kind = 2138 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2139 Args.getEndLoc()); 2140 2141 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2142 if (DelegationInit.isInvalid()) 2143 return true; 2144 2145 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2146 CXXConstructorDecl *Constructor 2147 = ConExpr->getConstructor(); 2148 assert(Constructor && "Delegating constructor with no target?"); 2149 2150 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2151 2152 // C++0x [class.base.init]p7: 2153 // The initialization of each base and member constitutes a 2154 // full-expression. 2155 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2156 if (DelegationInit.isInvalid()) 2157 return true; 2158 2159 assert(!CurContext->isDependentContext()); 2160 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2161 Constructor, 2162 DelegationInit.takeAs<Expr>(), 2163 Args.getEndLoc()); 2164} 2165 2166MemInitResult 2167Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2168 const MultiInitializer &Args, 2169 CXXRecordDecl *ClassDecl, 2170 SourceLocation EllipsisLoc) { 2171 bool HasDependentArg = Args.isTypeDependent(); 2172 2173 SourceLocation BaseLoc 2174 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2175 2176 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2177 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2178 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2179 2180 // C++ [class.base.init]p2: 2181 // [...] Unless the mem-initializer-id names a nonstatic data 2182 // member of the constructor's class or a direct or virtual base 2183 // of that class, the mem-initializer is ill-formed. A 2184 // mem-initializer-list can initialize a base class using any 2185 // name that denotes that base class type. 2186 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2187 2188 if (EllipsisLoc.isValid()) { 2189 // This is a pack expansion. 2190 if (!BaseType->containsUnexpandedParameterPack()) { 2191 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2192 << SourceRange(BaseLoc, Args.getEndLoc()); 2193 2194 EllipsisLoc = SourceLocation(); 2195 } 2196 } else { 2197 // Check for any unexpanded parameter packs. 2198 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2199 return true; 2200 2201 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2202 return true; 2203 } 2204 2205 // Check for direct and virtual base classes. 2206 const CXXBaseSpecifier *DirectBaseSpec = 0; 2207 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2208 if (!Dependent) { 2209 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2210 BaseType)) 2211 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2212 2213 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2214 VirtualBaseSpec); 2215 2216 // C++ [base.class.init]p2: 2217 // Unless the mem-initializer-id names a nonstatic data member of the 2218 // constructor's class or a direct or virtual base of that class, the 2219 // mem-initializer is ill-formed. 2220 if (!DirectBaseSpec && !VirtualBaseSpec) { 2221 // If the class has any dependent bases, then it's possible that 2222 // one of those types will resolve to the same type as 2223 // BaseType. Therefore, just treat this as a dependent base 2224 // class initialization. FIXME: Should we try to check the 2225 // initialization anyway? It seems odd. 2226 if (ClassDecl->hasAnyDependentBases()) 2227 Dependent = true; 2228 else 2229 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2230 << BaseType << Context.getTypeDeclType(ClassDecl) 2231 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2232 } 2233 } 2234 2235 if (Dependent) { 2236 // Can't check initialization for a base of dependent type or when 2237 // any of the arguments are type-dependent expressions. 2238 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2239 2240 DiscardCleanupsInEvaluationContext(); 2241 2242 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2243 /*IsVirtual=*/false, 2244 Args.getStartLoc(), BaseInit, 2245 Args.getEndLoc(), EllipsisLoc); 2246 } 2247 2248 // C++ [base.class.init]p2: 2249 // If a mem-initializer-id is ambiguous because it designates both 2250 // a direct non-virtual base class and an inherited virtual base 2251 // class, the mem-initializer is ill-formed. 2252 if (DirectBaseSpec && VirtualBaseSpec) 2253 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2254 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2255 2256 CXXBaseSpecifier *BaseSpec 2257 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2258 if (!BaseSpec) 2259 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2260 2261 // Initialize the base. 2262 InitializedEntity BaseEntity = 2263 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2264 InitializationKind Kind = 2265 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2266 Args.getEndLoc()); 2267 2268 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2269 if (BaseInit.isInvalid()) 2270 return true; 2271 2272 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2273 2274 // C++0x [class.base.init]p7: 2275 // The initialization of each base and member constitutes a 2276 // full-expression. 2277 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2278 if (BaseInit.isInvalid()) 2279 return true; 2280 2281 // If we are in a dependent context, template instantiation will 2282 // perform this type-checking again. Just save the arguments that we 2283 // received in a ParenListExpr. 2284 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2285 // of the information that we have about the base 2286 // initializer. However, deconstructing the ASTs is a dicey process, 2287 // and this approach is far more likely to get the corner cases right. 2288 if (CurContext->isDependentContext()) 2289 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2290 2291 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2292 BaseSpec->isVirtual(), 2293 Args.getStartLoc(), 2294 BaseInit.takeAs<Expr>(), 2295 Args.getEndLoc(), EllipsisLoc); 2296} 2297 2298// Create a static_cast\<T&&>(expr). 2299static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2300 QualType ExprType = E->getType(); 2301 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2302 SourceLocation ExprLoc = E->getLocStart(); 2303 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2304 TargetType, ExprLoc); 2305 2306 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2307 SourceRange(ExprLoc, ExprLoc), 2308 E->getSourceRange()).take(); 2309} 2310 2311/// ImplicitInitializerKind - How an implicit base or member initializer should 2312/// initialize its base or member. 2313enum ImplicitInitializerKind { 2314 IIK_Default, 2315 IIK_Copy, 2316 IIK_Move 2317}; 2318 2319static bool 2320BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2321 ImplicitInitializerKind ImplicitInitKind, 2322 CXXBaseSpecifier *BaseSpec, 2323 bool IsInheritedVirtualBase, 2324 CXXCtorInitializer *&CXXBaseInit) { 2325 InitializedEntity InitEntity 2326 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2327 IsInheritedVirtualBase); 2328 2329 ExprResult BaseInit; 2330 2331 switch (ImplicitInitKind) { 2332 case IIK_Default: { 2333 InitializationKind InitKind 2334 = InitializationKind::CreateDefault(Constructor->getLocation()); 2335 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2336 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2337 MultiExprArg(SemaRef, 0, 0)); 2338 break; 2339 } 2340 2341 case IIK_Move: 2342 case IIK_Copy: { 2343 bool Moving = ImplicitInitKind == IIK_Move; 2344 ParmVarDecl *Param = Constructor->getParamDecl(0); 2345 QualType ParamType = Param->getType().getNonReferenceType(); 2346 2347 Expr *CopyCtorArg = 2348 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2349 Constructor->getLocation(), ParamType, 2350 VK_LValue, 0); 2351 2352 // Cast to the base class to avoid ambiguities. 2353 QualType ArgTy = 2354 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2355 ParamType.getQualifiers()); 2356 2357 if (Moving) { 2358 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2359 } 2360 2361 CXXCastPath BasePath; 2362 BasePath.push_back(BaseSpec); 2363 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2364 CK_UncheckedDerivedToBase, 2365 Moving ? VK_XValue : VK_LValue, 2366 &BasePath).take(); 2367 2368 InitializationKind InitKind 2369 = InitializationKind::CreateDirect(Constructor->getLocation(), 2370 SourceLocation(), SourceLocation()); 2371 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2372 &CopyCtorArg, 1); 2373 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2374 MultiExprArg(&CopyCtorArg, 1)); 2375 break; 2376 } 2377 } 2378 2379 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2380 if (BaseInit.isInvalid()) 2381 return true; 2382 2383 CXXBaseInit = 2384 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2385 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2386 SourceLocation()), 2387 BaseSpec->isVirtual(), 2388 SourceLocation(), 2389 BaseInit.takeAs<Expr>(), 2390 SourceLocation(), 2391 SourceLocation()); 2392 2393 return false; 2394} 2395 2396static bool RefersToRValueRef(Expr *MemRef) { 2397 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2398 return Referenced->getType()->isRValueReferenceType(); 2399} 2400 2401static bool 2402BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2403 ImplicitInitializerKind ImplicitInitKind, 2404 FieldDecl *Field, IndirectFieldDecl *Indirect, 2405 CXXCtorInitializer *&CXXMemberInit) { 2406 if (Field->isInvalidDecl()) 2407 return true; 2408 2409 SourceLocation Loc = Constructor->getLocation(); 2410 2411 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2412 bool Moving = ImplicitInitKind == IIK_Move; 2413 ParmVarDecl *Param = Constructor->getParamDecl(0); 2414 QualType ParamType = Param->getType().getNonReferenceType(); 2415 2416 // Suppress copying zero-width bitfields. 2417 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2418 return false; 2419 2420 Expr *MemberExprBase = 2421 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2422 Loc, ParamType, VK_LValue, 0); 2423 2424 if (Moving) { 2425 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2426 } 2427 2428 // Build a reference to this field within the parameter. 2429 CXXScopeSpec SS; 2430 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2431 Sema::LookupMemberName); 2432 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2433 : cast<ValueDecl>(Field), AS_public); 2434 MemberLookup.resolveKind(); 2435 ExprResult CtorArg 2436 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2437 ParamType, Loc, 2438 /*IsArrow=*/false, 2439 SS, 2440 /*FirstQualifierInScope=*/0, 2441 MemberLookup, 2442 /*TemplateArgs=*/0); 2443 if (CtorArg.isInvalid()) 2444 return true; 2445 2446 // C++11 [class.copy]p15: 2447 // - if a member m has rvalue reference type T&&, it is direct-initialized 2448 // with static_cast<T&&>(x.m); 2449 if (RefersToRValueRef(CtorArg.get())) { 2450 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2451 } 2452 2453 // When the field we are copying is an array, create index variables for 2454 // each dimension of the array. We use these index variables to subscript 2455 // the source array, and other clients (e.g., CodeGen) will perform the 2456 // necessary iteration with these index variables. 2457 SmallVector<VarDecl *, 4> IndexVariables; 2458 QualType BaseType = Field->getType(); 2459 QualType SizeType = SemaRef.Context.getSizeType(); 2460 bool InitializingArray = false; 2461 while (const ConstantArrayType *Array 2462 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2463 InitializingArray = true; 2464 // Create the iteration variable for this array index. 2465 IdentifierInfo *IterationVarName = 0; 2466 { 2467 llvm::SmallString<8> Str; 2468 llvm::raw_svector_ostream OS(Str); 2469 OS << "__i" << IndexVariables.size(); 2470 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2471 } 2472 VarDecl *IterationVar 2473 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2474 IterationVarName, SizeType, 2475 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2476 SC_None, SC_None); 2477 IndexVariables.push_back(IterationVar); 2478 2479 // Create a reference to the iteration variable. 2480 ExprResult IterationVarRef 2481 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2482 assert(!IterationVarRef.isInvalid() && 2483 "Reference to invented variable cannot fail!"); 2484 2485 // Subscript the array with this iteration variable. 2486 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2487 IterationVarRef.take(), 2488 Loc); 2489 if (CtorArg.isInvalid()) 2490 return true; 2491 2492 BaseType = Array->getElementType(); 2493 } 2494 2495 // The array subscript expression is an lvalue, which is wrong for moving. 2496 if (Moving && InitializingArray) 2497 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2498 2499 // Construct the entity that we will be initializing. For an array, this 2500 // will be first element in the array, which may require several levels 2501 // of array-subscript entities. 2502 SmallVector<InitializedEntity, 4> Entities; 2503 Entities.reserve(1 + IndexVariables.size()); 2504 if (Indirect) 2505 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2506 else 2507 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2508 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2509 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2510 0, 2511 Entities.back())); 2512 2513 // Direct-initialize to use the copy constructor. 2514 InitializationKind InitKind = 2515 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2516 2517 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2518 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2519 &CtorArgE, 1); 2520 2521 ExprResult MemberInit 2522 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2523 MultiExprArg(&CtorArgE, 1)); 2524 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2525 if (MemberInit.isInvalid()) 2526 return true; 2527 2528 if (Indirect) { 2529 assert(IndexVariables.size() == 0 && 2530 "Indirect field improperly initialized"); 2531 CXXMemberInit 2532 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2533 Loc, Loc, 2534 MemberInit.takeAs<Expr>(), 2535 Loc); 2536 } else 2537 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2538 Loc, MemberInit.takeAs<Expr>(), 2539 Loc, 2540 IndexVariables.data(), 2541 IndexVariables.size()); 2542 return false; 2543 } 2544 2545 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2546 2547 QualType FieldBaseElementType = 2548 SemaRef.Context.getBaseElementType(Field->getType()); 2549 2550 if (FieldBaseElementType->isRecordType()) { 2551 InitializedEntity InitEntity 2552 = Indirect? InitializedEntity::InitializeMember(Indirect) 2553 : InitializedEntity::InitializeMember(Field); 2554 InitializationKind InitKind = 2555 InitializationKind::CreateDefault(Loc); 2556 2557 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2558 ExprResult MemberInit = 2559 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2560 2561 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2562 if (MemberInit.isInvalid()) 2563 return true; 2564 2565 if (Indirect) 2566 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2567 Indirect, Loc, 2568 Loc, 2569 MemberInit.get(), 2570 Loc); 2571 else 2572 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2573 Field, Loc, Loc, 2574 MemberInit.get(), 2575 Loc); 2576 return false; 2577 } 2578 2579 if (!Field->getParent()->isUnion()) { 2580 if (FieldBaseElementType->isReferenceType()) { 2581 SemaRef.Diag(Constructor->getLocation(), 2582 diag::err_uninitialized_member_in_ctor) 2583 << (int)Constructor->isImplicit() 2584 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2585 << 0 << Field->getDeclName(); 2586 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2587 return true; 2588 } 2589 2590 if (FieldBaseElementType.isConstQualified()) { 2591 SemaRef.Diag(Constructor->getLocation(), 2592 diag::err_uninitialized_member_in_ctor) 2593 << (int)Constructor->isImplicit() 2594 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2595 << 1 << Field->getDeclName(); 2596 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2597 return true; 2598 } 2599 } 2600 2601 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2602 FieldBaseElementType->isObjCRetainableType() && 2603 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2604 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2605 // Instant objects: 2606 // Default-initialize Objective-C pointers to NULL. 2607 CXXMemberInit 2608 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2609 Loc, Loc, 2610 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2611 Loc); 2612 return false; 2613 } 2614 2615 // Nothing to initialize. 2616 CXXMemberInit = 0; 2617 return false; 2618} 2619 2620namespace { 2621struct BaseAndFieldInfo { 2622 Sema &S; 2623 CXXConstructorDecl *Ctor; 2624 bool AnyErrorsInInits; 2625 ImplicitInitializerKind IIK; 2626 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2627 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2628 2629 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2630 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2631 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2632 if (Generated && Ctor->isCopyConstructor()) 2633 IIK = IIK_Copy; 2634 else if (Generated && Ctor->isMoveConstructor()) 2635 IIK = IIK_Move; 2636 else 2637 IIK = IIK_Default; 2638 } 2639}; 2640} 2641 2642/// \brief Determine whether the given indirect field declaration is somewhere 2643/// within an anonymous union. 2644static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2645 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2646 CEnd = F->chain_end(); 2647 C != CEnd; ++C) 2648 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2649 if (Record->isUnion()) 2650 return true; 2651 2652 return false; 2653} 2654 2655static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2656 FieldDecl *Field, 2657 IndirectFieldDecl *Indirect = 0) { 2658 2659 // Overwhelmingly common case: we have a direct initializer for this field. 2660 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2661 Info.AllToInit.push_back(Init); 2662 return false; 2663 } 2664 2665 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2666 // has a brace-or-equal-initializer, the entity is initialized as specified 2667 // in [dcl.init]. 2668 if (Field->hasInClassInitializer()) { 2669 CXXCtorInitializer *Init; 2670 if (Indirect) 2671 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2672 SourceLocation(), 2673 SourceLocation(), 0, 2674 SourceLocation()); 2675 else 2676 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2677 SourceLocation(), 2678 SourceLocation(), 0, 2679 SourceLocation()); 2680 Info.AllToInit.push_back(Init); 2681 return false; 2682 } 2683 2684 // Don't build an implicit initializer for union members if none was 2685 // explicitly specified. 2686 if (Field->getParent()->isUnion() || 2687 (Indirect && isWithinAnonymousUnion(Indirect))) 2688 return false; 2689 2690 // Don't try to build an implicit initializer if there were semantic 2691 // errors in any of the initializers (and therefore we might be 2692 // missing some that the user actually wrote). 2693 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2694 return false; 2695 2696 CXXCtorInitializer *Init = 0; 2697 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2698 Indirect, Init)) 2699 return true; 2700 2701 if (Init) 2702 Info.AllToInit.push_back(Init); 2703 2704 return false; 2705} 2706 2707bool 2708Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2709 CXXCtorInitializer *Initializer) { 2710 assert(Initializer->isDelegatingInitializer()); 2711 Constructor->setNumCtorInitializers(1); 2712 CXXCtorInitializer **initializer = 2713 new (Context) CXXCtorInitializer*[1]; 2714 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2715 Constructor->setCtorInitializers(initializer); 2716 2717 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2718 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2719 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2720 } 2721 2722 DelegatingCtorDecls.push_back(Constructor); 2723 2724 return false; 2725} 2726 2727bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2728 CXXCtorInitializer **Initializers, 2729 unsigned NumInitializers, 2730 bool AnyErrors) { 2731 if (Constructor->isDependentContext()) { 2732 // Just store the initializers as written, they will be checked during 2733 // instantiation. 2734 if (NumInitializers > 0) { 2735 Constructor->setNumCtorInitializers(NumInitializers); 2736 CXXCtorInitializer **baseOrMemberInitializers = 2737 new (Context) CXXCtorInitializer*[NumInitializers]; 2738 memcpy(baseOrMemberInitializers, Initializers, 2739 NumInitializers * sizeof(CXXCtorInitializer*)); 2740 Constructor->setCtorInitializers(baseOrMemberInitializers); 2741 } 2742 2743 return false; 2744 } 2745 2746 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2747 2748 // We need to build the initializer AST according to order of construction 2749 // and not what user specified in the Initializers list. 2750 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2751 if (!ClassDecl) 2752 return true; 2753 2754 bool HadError = false; 2755 2756 for (unsigned i = 0; i < NumInitializers; i++) { 2757 CXXCtorInitializer *Member = Initializers[i]; 2758 2759 if (Member->isBaseInitializer()) 2760 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2761 else 2762 Info.AllBaseFields[Member->getAnyMember()] = Member; 2763 } 2764 2765 // Keep track of the direct virtual bases. 2766 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2767 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2768 E = ClassDecl->bases_end(); I != E; ++I) { 2769 if (I->isVirtual()) 2770 DirectVBases.insert(I); 2771 } 2772 2773 // Push virtual bases before others. 2774 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2775 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2776 2777 if (CXXCtorInitializer *Value 2778 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2779 Info.AllToInit.push_back(Value); 2780 } else if (!AnyErrors) { 2781 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2782 CXXCtorInitializer *CXXBaseInit; 2783 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2784 VBase, IsInheritedVirtualBase, 2785 CXXBaseInit)) { 2786 HadError = true; 2787 continue; 2788 } 2789 2790 Info.AllToInit.push_back(CXXBaseInit); 2791 } 2792 } 2793 2794 // Non-virtual bases. 2795 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2796 E = ClassDecl->bases_end(); Base != E; ++Base) { 2797 // Virtuals are in the virtual base list and already constructed. 2798 if (Base->isVirtual()) 2799 continue; 2800 2801 if (CXXCtorInitializer *Value 2802 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2803 Info.AllToInit.push_back(Value); 2804 } else if (!AnyErrors) { 2805 CXXCtorInitializer *CXXBaseInit; 2806 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2807 Base, /*IsInheritedVirtualBase=*/false, 2808 CXXBaseInit)) { 2809 HadError = true; 2810 continue; 2811 } 2812 2813 Info.AllToInit.push_back(CXXBaseInit); 2814 } 2815 } 2816 2817 // Fields. 2818 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2819 MemEnd = ClassDecl->decls_end(); 2820 Mem != MemEnd; ++Mem) { 2821 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2822 // C++ [class.bit]p2: 2823 // A declaration for a bit-field that omits the identifier declares an 2824 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2825 // initialized. 2826 if (F->isUnnamedBitfield()) 2827 continue; 2828 2829 if (F->getType()->isIncompleteArrayType()) { 2830 assert(ClassDecl->hasFlexibleArrayMember() && 2831 "Incomplete array type is not valid"); 2832 continue; 2833 } 2834 2835 // If we're not generating the implicit copy/move constructor, then we'll 2836 // handle anonymous struct/union fields based on their individual 2837 // indirect fields. 2838 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2839 continue; 2840 2841 if (CollectFieldInitializer(*this, Info, F)) 2842 HadError = true; 2843 continue; 2844 } 2845 2846 // Beyond this point, we only consider default initialization. 2847 if (Info.IIK != IIK_Default) 2848 continue; 2849 2850 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2851 if (F->getType()->isIncompleteArrayType()) { 2852 assert(ClassDecl->hasFlexibleArrayMember() && 2853 "Incomplete array type is not valid"); 2854 continue; 2855 } 2856 2857 // Initialize each field of an anonymous struct individually. 2858 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2859 HadError = true; 2860 2861 continue; 2862 } 2863 } 2864 2865 NumInitializers = Info.AllToInit.size(); 2866 if (NumInitializers > 0) { 2867 Constructor->setNumCtorInitializers(NumInitializers); 2868 CXXCtorInitializer **baseOrMemberInitializers = 2869 new (Context) CXXCtorInitializer*[NumInitializers]; 2870 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2871 NumInitializers * sizeof(CXXCtorInitializer*)); 2872 Constructor->setCtorInitializers(baseOrMemberInitializers); 2873 2874 // Constructors implicitly reference the base and member 2875 // destructors. 2876 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2877 Constructor->getParent()); 2878 } 2879 2880 return HadError; 2881} 2882 2883static void *GetKeyForTopLevelField(FieldDecl *Field) { 2884 // For anonymous unions, use the class declaration as the key. 2885 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2886 if (RT->getDecl()->isAnonymousStructOrUnion()) 2887 return static_cast<void *>(RT->getDecl()); 2888 } 2889 return static_cast<void *>(Field); 2890} 2891 2892static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2893 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2894} 2895 2896static void *GetKeyForMember(ASTContext &Context, 2897 CXXCtorInitializer *Member) { 2898 if (!Member->isAnyMemberInitializer()) 2899 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2900 2901 // For fields injected into the class via declaration of an anonymous union, 2902 // use its anonymous union class declaration as the unique key. 2903 FieldDecl *Field = Member->getAnyMember(); 2904 2905 // If the field is a member of an anonymous struct or union, our key 2906 // is the anonymous record decl that's a direct child of the class. 2907 RecordDecl *RD = Field->getParent(); 2908 if (RD->isAnonymousStructOrUnion()) { 2909 while (true) { 2910 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2911 if (Parent->isAnonymousStructOrUnion()) 2912 RD = Parent; 2913 else 2914 break; 2915 } 2916 2917 return static_cast<void *>(RD); 2918 } 2919 2920 return static_cast<void *>(Field); 2921} 2922 2923static void 2924DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2925 const CXXConstructorDecl *Constructor, 2926 CXXCtorInitializer **Inits, 2927 unsigned NumInits) { 2928 if (Constructor->getDeclContext()->isDependentContext()) 2929 return; 2930 2931 // Don't check initializers order unless the warning is enabled at the 2932 // location of at least one initializer. 2933 bool ShouldCheckOrder = false; 2934 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2935 CXXCtorInitializer *Init = Inits[InitIndex]; 2936 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2937 Init->getSourceLocation()) 2938 != DiagnosticsEngine::Ignored) { 2939 ShouldCheckOrder = true; 2940 break; 2941 } 2942 } 2943 if (!ShouldCheckOrder) 2944 return; 2945 2946 // Build the list of bases and members in the order that they'll 2947 // actually be initialized. The explicit initializers should be in 2948 // this same order but may be missing things. 2949 SmallVector<const void*, 32> IdealInitKeys; 2950 2951 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2952 2953 // 1. Virtual bases. 2954 for (CXXRecordDecl::base_class_const_iterator VBase = 2955 ClassDecl->vbases_begin(), 2956 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2957 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2958 2959 // 2. Non-virtual bases. 2960 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2961 E = ClassDecl->bases_end(); Base != E; ++Base) { 2962 if (Base->isVirtual()) 2963 continue; 2964 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2965 } 2966 2967 // 3. Direct fields. 2968 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2969 E = ClassDecl->field_end(); Field != E; ++Field) { 2970 if (Field->isUnnamedBitfield()) 2971 continue; 2972 2973 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2974 } 2975 2976 unsigned NumIdealInits = IdealInitKeys.size(); 2977 unsigned IdealIndex = 0; 2978 2979 CXXCtorInitializer *PrevInit = 0; 2980 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2981 CXXCtorInitializer *Init = Inits[InitIndex]; 2982 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2983 2984 // Scan forward to try to find this initializer in the idealized 2985 // initializers list. 2986 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2987 if (InitKey == IdealInitKeys[IdealIndex]) 2988 break; 2989 2990 // If we didn't find this initializer, it must be because we 2991 // scanned past it on a previous iteration. That can only 2992 // happen if we're out of order; emit a warning. 2993 if (IdealIndex == NumIdealInits && PrevInit) { 2994 Sema::SemaDiagnosticBuilder D = 2995 SemaRef.Diag(PrevInit->getSourceLocation(), 2996 diag::warn_initializer_out_of_order); 2997 2998 if (PrevInit->isAnyMemberInitializer()) 2999 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3000 else 3001 D << 1 << PrevInit->getBaseClassInfo()->getType(); 3002 3003 if (Init->isAnyMemberInitializer()) 3004 D << 0 << Init->getAnyMember()->getDeclName(); 3005 else 3006 D << 1 << Init->getBaseClassInfo()->getType(); 3007 3008 // Move back to the initializer's location in the ideal list. 3009 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3010 if (InitKey == IdealInitKeys[IdealIndex]) 3011 break; 3012 3013 assert(IdealIndex != NumIdealInits && 3014 "initializer not found in initializer list"); 3015 } 3016 3017 PrevInit = Init; 3018 } 3019} 3020 3021namespace { 3022bool CheckRedundantInit(Sema &S, 3023 CXXCtorInitializer *Init, 3024 CXXCtorInitializer *&PrevInit) { 3025 if (!PrevInit) { 3026 PrevInit = Init; 3027 return false; 3028 } 3029 3030 if (FieldDecl *Field = Init->getMember()) 3031 S.Diag(Init->getSourceLocation(), 3032 diag::err_multiple_mem_initialization) 3033 << Field->getDeclName() 3034 << Init->getSourceRange(); 3035 else { 3036 const Type *BaseClass = Init->getBaseClass(); 3037 assert(BaseClass && "neither field nor base"); 3038 S.Diag(Init->getSourceLocation(), 3039 diag::err_multiple_base_initialization) 3040 << QualType(BaseClass, 0) 3041 << Init->getSourceRange(); 3042 } 3043 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3044 << 0 << PrevInit->getSourceRange(); 3045 3046 return true; 3047} 3048 3049typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3050typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3051 3052bool CheckRedundantUnionInit(Sema &S, 3053 CXXCtorInitializer *Init, 3054 RedundantUnionMap &Unions) { 3055 FieldDecl *Field = Init->getAnyMember(); 3056 RecordDecl *Parent = Field->getParent(); 3057 if (!Parent->isAnonymousStructOrUnion()) 3058 return false; 3059 3060 NamedDecl *Child = Field; 3061 do { 3062 if (Parent->isUnion()) { 3063 UnionEntry &En = Unions[Parent]; 3064 if (En.first && En.first != Child) { 3065 S.Diag(Init->getSourceLocation(), 3066 diag::err_multiple_mem_union_initialization) 3067 << Field->getDeclName() 3068 << Init->getSourceRange(); 3069 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3070 << 0 << En.second->getSourceRange(); 3071 return true; 3072 } else if (!En.first) { 3073 En.first = Child; 3074 En.second = Init; 3075 } 3076 } 3077 3078 Child = Parent; 3079 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3080 } while (Parent->isAnonymousStructOrUnion()); 3081 3082 return false; 3083} 3084} 3085 3086/// ActOnMemInitializers - Handle the member initializers for a constructor. 3087void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3088 SourceLocation ColonLoc, 3089 CXXCtorInitializer **meminits, 3090 unsigned NumMemInits, 3091 bool AnyErrors) { 3092 if (!ConstructorDecl) 3093 return; 3094 3095 AdjustDeclIfTemplate(ConstructorDecl); 3096 3097 CXXConstructorDecl *Constructor 3098 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3099 3100 if (!Constructor) { 3101 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3102 return; 3103 } 3104 3105 CXXCtorInitializer **MemInits = 3106 reinterpret_cast<CXXCtorInitializer **>(meminits); 3107 3108 // Mapping for the duplicate initializers check. 3109 // For member initializers, this is keyed with a FieldDecl*. 3110 // For base initializers, this is keyed with a Type*. 3111 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3112 3113 // Mapping for the inconsistent anonymous-union initializers check. 3114 RedundantUnionMap MemberUnions; 3115 3116 bool HadError = false; 3117 for (unsigned i = 0; i < NumMemInits; i++) { 3118 CXXCtorInitializer *Init = MemInits[i]; 3119 3120 // Set the source order index. 3121 Init->setSourceOrder(i); 3122 3123 if (Init->isAnyMemberInitializer()) { 3124 FieldDecl *Field = Init->getAnyMember(); 3125 if (CheckRedundantInit(*this, Init, Members[Field]) || 3126 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3127 HadError = true; 3128 } else if (Init->isBaseInitializer()) { 3129 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3130 if (CheckRedundantInit(*this, Init, Members[Key])) 3131 HadError = true; 3132 } else { 3133 assert(Init->isDelegatingInitializer()); 3134 // This must be the only initializer 3135 if (i != 0 || NumMemInits > 1) { 3136 Diag(MemInits[0]->getSourceLocation(), 3137 diag::err_delegating_initializer_alone) 3138 << MemInits[0]->getSourceRange(); 3139 HadError = true; 3140 // We will treat this as being the only initializer. 3141 } 3142 SetDelegatingInitializer(Constructor, MemInits[i]); 3143 // Return immediately as the initializer is set. 3144 return; 3145 } 3146 } 3147 3148 if (HadError) 3149 return; 3150 3151 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3152 3153 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3154} 3155 3156void 3157Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3158 CXXRecordDecl *ClassDecl) { 3159 // Ignore dependent contexts. Also ignore unions, since their members never 3160 // have destructors implicitly called. 3161 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3162 return; 3163 3164 // FIXME: all the access-control diagnostics are positioned on the 3165 // field/base declaration. That's probably good; that said, the 3166 // user might reasonably want to know why the destructor is being 3167 // emitted, and we currently don't say. 3168 3169 // Non-static data members. 3170 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3171 E = ClassDecl->field_end(); I != E; ++I) { 3172 FieldDecl *Field = *I; 3173 if (Field->isInvalidDecl()) 3174 continue; 3175 QualType FieldType = Context.getBaseElementType(Field->getType()); 3176 3177 const RecordType* RT = FieldType->getAs<RecordType>(); 3178 if (!RT) 3179 continue; 3180 3181 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3182 if (FieldClassDecl->isInvalidDecl()) 3183 continue; 3184 if (FieldClassDecl->hasTrivialDestructor()) 3185 continue; 3186 3187 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3188 assert(Dtor && "No dtor found for FieldClassDecl!"); 3189 CheckDestructorAccess(Field->getLocation(), Dtor, 3190 PDiag(diag::err_access_dtor_field) 3191 << Field->getDeclName() 3192 << FieldType); 3193 3194 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3195 } 3196 3197 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3198 3199 // Bases. 3200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3201 E = ClassDecl->bases_end(); Base != E; ++Base) { 3202 // Bases are always records in a well-formed non-dependent class. 3203 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3204 3205 // Remember direct virtual bases. 3206 if (Base->isVirtual()) 3207 DirectVirtualBases.insert(RT); 3208 3209 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3210 // If our base class is invalid, we probably can't get its dtor anyway. 3211 if (BaseClassDecl->isInvalidDecl()) 3212 continue; 3213 // Ignore trivial destructors. 3214 if (BaseClassDecl->hasTrivialDestructor()) 3215 continue; 3216 3217 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3218 assert(Dtor && "No dtor found for BaseClassDecl!"); 3219 3220 // FIXME: caret should be on the start of the class name 3221 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3222 PDiag(diag::err_access_dtor_base) 3223 << Base->getType() 3224 << Base->getSourceRange()); 3225 3226 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3227 } 3228 3229 // Virtual bases. 3230 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3231 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3232 3233 // Bases are always records in a well-formed non-dependent class. 3234 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3235 3236 // Ignore direct virtual bases. 3237 if (DirectVirtualBases.count(RT)) 3238 continue; 3239 3240 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3241 // If our base class is invalid, we probably can't get its dtor anyway. 3242 if (BaseClassDecl->isInvalidDecl()) 3243 continue; 3244 // Ignore trivial destructors. 3245 if (BaseClassDecl->hasTrivialDestructor()) 3246 continue; 3247 3248 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3249 assert(Dtor && "No dtor found for BaseClassDecl!"); 3250 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3251 PDiag(diag::err_access_dtor_vbase) 3252 << VBase->getType()); 3253 3254 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3255 } 3256} 3257 3258void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3259 if (!CDtorDecl) 3260 return; 3261 3262 if (CXXConstructorDecl *Constructor 3263 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3264 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3265} 3266 3267bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3268 unsigned DiagID, AbstractDiagSelID SelID) { 3269 if (SelID == -1) 3270 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3271 else 3272 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3273} 3274 3275bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3276 const PartialDiagnostic &PD) { 3277 if (!getLangOptions().CPlusPlus) 3278 return false; 3279 3280 if (const ArrayType *AT = Context.getAsArrayType(T)) 3281 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3282 3283 if (const PointerType *PT = T->getAs<PointerType>()) { 3284 // Find the innermost pointer type. 3285 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3286 PT = T; 3287 3288 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3289 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3290 } 3291 3292 const RecordType *RT = T->getAs<RecordType>(); 3293 if (!RT) 3294 return false; 3295 3296 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3297 3298 // We can't answer whether something is abstract until it has a 3299 // definition. If it's currently being defined, we'll walk back 3300 // over all the declarations when we have a full definition. 3301 const CXXRecordDecl *Def = RD->getDefinition(); 3302 if (!Def || Def->isBeingDefined()) 3303 return false; 3304 3305 if (!RD->isAbstract()) 3306 return false; 3307 3308 Diag(Loc, PD) << RD->getDeclName(); 3309 DiagnoseAbstractType(RD); 3310 3311 return true; 3312} 3313 3314void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3315 // Check if we've already emitted the list of pure virtual functions 3316 // for this class. 3317 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3318 return; 3319 3320 CXXFinalOverriderMap FinalOverriders; 3321 RD->getFinalOverriders(FinalOverriders); 3322 3323 // Keep a set of seen pure methods so we won't diagnose the same method 3324 // more than once. 3325 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3326 3327 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3328 MEnd = FinalOverriders.end(); 3329 M != MEnd; 3330 ++M) { 3331 for (OverridingMethods::iterator SO = M->second.begin(), 3332 SOEnd = M->second.end(); 3333 SO != SOEnd; ++SO) { 3334 // C++ [class.abstract]p4: 3335 // A class is abstract if it contains or inherits at least one 3336 // pure virtual function for which the final overrider is pure 3337 // virtual. 3338 3339 // 3340 if (SO->second.size() != 1) 3341 continue; 3342 3343 if (!SO->second.front().Method->isPure()) 3344 continue; 3345 3346 if (!SeenPureMethods.insert(SO->second.front().Method)) 3347 continue; 3348 3349 Diag(SO->second.front().Method->getLocation(), 3350 diag::note_pure_virtual_function) 3351 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3352 } 3353 } 3354 3355 if (!PureVirtualClassDiagSet) 3356 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3357 PureVirtualClassDiagSet->insert(RD); 3358} 3359 3360namespace { 3361struct AbstractUsageInfo { 3362 Sema &S; 3363 CXXRecordDecl *Record; 3364 CanQualType AbstractType; 3365 bool Invalid; 3366 3367 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3368 : S(S), Record(Record), 3369 AbstractType(S.Context.getCanonicalType( 3370 S.Context.getTypeDeclType(Record))), 3371 Invalid(false) {} 3372 3373 void DiagnoseAbstractType() { 3374 if (Invalid) return; 3375 S.DiagnoseAbstractType(Record); 3376 Invalid = true; 3377 } 3378 3379 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3380}; 3381 3382struct CheckAbstractUsage { 3383 AbstractUsageInfo &Info; 3384 const NamedDecl *Ctx; 3385 3386 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3387 : Info(Info), Ctx(Ctx) {} 3388 3389 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3390 switch (TL.getTypeLocClass()) { 3391#define ABSTRACT_TYPELOC(CLASS, PARENT) 3392#define TYPELOC(CLASS, PARENT) \ 3393 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3394#include "clang/AST/TypeLocNodes.def" 3395 } 3396 } 3397 3398 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3399 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3400 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3401 if (!TL.getArg(I)) 3402 continue; 3403 3404 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3405 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3406 } 3407 } 3408 3409 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3410 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3411 } 3412 3413 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3414 // Visit the type parameters from a permissive context. 3415 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3416 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3417 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3418 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3419 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3420 // TODO: other template argument types? 3421 } 3422 } 3423 3424 // Visit pointee types from a permissive context. 3425#define CheckPolymorphic(Type) \ 3426 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3427 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3428 } 3429 CheckPolymorphic(PointerTypeLoc) 3430 CheckPolymorphic(ReferenceTypeLoc) 3431 CheckPolymorphic(MemberPointerTypeLoc) 3432 CheckPolymorphic(BlockPointerTypeLoc) 3433 CheckPolymorphic(AtomicTypeLoc) 3434 3435 /// Handle all the types we haven't given a more specific 3436 /// implementation for above. 3437 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3438 // Every other kind of type that we haven't called out already 3439 // that has an inner type is either (1) sugar or (2) contains that 3440 // inner type in some way as a subobject. 3441 if (TypeLoc Next = TL.getNextTypeLoc()) 3442 return Visit(Next, Sel); 3443 3444 // If there's no inner type and we're in a permissive context, 3445 // don't diagnose. 3446 if (Sel == Sema::AbstractNone) return; 3447 3448 // Check whether the type matches the abstract type. 3449 QualType T = TL.getType(); 3450 if (T->isArrayType()) { 3451 Sel = Sema::AbstractArrayType; 3452 T = Info.S.Context.getBaseElementType(T); 3453 } 3454 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3455 if (CT != Info.AbstractType) return; 3456 3457 // It matched; do some magic. 3458 if (Sel == Sema::AbstractArrayType) { 3459 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3460 << T << TL.getSourceRange(); 3461 } else { 3462 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3463 << Sel << T << TL.getSourceRange(); 3464 } 3465 Info.DiagnoseAbstractType(); 3466 } 3467}; 3468 3469void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3470 Sema::AbstractDiagSelID Sel) { 3471 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3472} 3473 3474} 3475 3476/// Check for invalid uses of an abstract type in a method declaration. 3477static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3478 CXXMethodDecl *MD) { 3479 // No need to do the check on definitions, which require that 3480 // the return/param types be complete. 3481 if (MD->doesThisDeclarationHaveABody()) 3482 return; 3483 3484 // For safety's sake, just ignore it if we don't have type source 3485 // information. This should never happen for non-implicit methods, 3486 // but... 3487 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3488 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3489} 3490 3491/// Check for invalid uses of an abstract type within a class definition. 3492static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3493 CXXRecordDecl *RD) { 3494 for (CXXRecordDecl::decl_iterator 3495 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3496 Decl *D = *I; 3497 if (D->isImplicit()) continue; 3498 3499 // Methods and method templates. 3500 if (isa<CXXMethodDecl>(D)) { 3501 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3502 } else if (isa<FunctionTemplateDecl>(D)) { 3503 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3504 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3505 3506 // Fields and static variables. 3507 } else if (isa<FieldDecl>(D)) { 3508 FieldDecl *FD = cast<FieldDecl>(D); 3509 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3510 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3511 } else if (isa<VarDecl>(D)) { 3512 VarDecl *VD = cast<VarDecl>(D); 3513 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3514 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3515 3516 // Nested classes and class templates. 3517 } else if (isa<CXXRecordDecl>(D)) { 3518 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3519 } else if (isa<ClassTemplateDecl>(D)) { 3520 CheckAbstractClassUsage(Info, 3521 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3522 } 3523 } 3524} 3525 3526/// \brief Perform semantic checks on a class definition that has been 3527/// completing, introducing implicitly-declared members, checking for 3528/// abstract types, etc. 3529void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3530 if (!Record) 3531 return; 3532 3533 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3534 AbstractUsageInfo Info(*this, Record); 3535 CheckAbstractClassUsage(Info, Record); 3536 } 3537 3538 // If this is not an aggregate type and has no user-declared constructor, 3539 // complain about any non-static data members of reference or const scalar 3540 // type, since they will never get initializers. 3541 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3542 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3543 bool Complained = false; 3544 for (RecordDecl::field_iterator F = Record->field_begin(), 3545 FEnd = Record->field_end(); 3546 F != FEnd; ++F) { 3547 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3548 continue; 3549 3550 if (F->getType()->isReferenceType() || 3551 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3552 if (!Complained) { 3553 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3554 << Record->getTagKind() << Record; 3555 Complained = true; 3556 } 3557 3558 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3559 << F->getType()->isReferenceType() 3560 << F->getDeclName(); 3561 } 3562 } 3563 } 3564 3565 if (Record->isDynamicClass() && !Record->isDependentType()) 3566 DynamicClasses.push_back(Record); 3567 3568 if (Record->getIdentifier()) { 3569 // C++ [class.mem]p13: 3570 // If T is the name of a class, then each of the following shall have a 3571 // name different from T: 3572 // - every member of every anonymous union that is a member of class T. 3573 // 3574 // C++ [class.mem]p14: 3575 // In addition, if class T has a user-declared constructor (12.1), every 3576 // non-static data member of class T shall have a name different from T. 3577 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3578 R.first != R.second; ++R.first) { 3579 NamedDecl *D = *R.first; 3580 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3581 isa<IndirectFieldDecl>(D)) { 3582 Diag(D->getLocation(), diag::err_member_name_of_class) 3583 << D->getDeclName(); 3584 break; 3585 } 3586 } 3587 } 3588 3589 // Warn if the class has virtual methods but non-virtual public destructor. 3590 if (Record->isPolymorphic() && !Record->isDependentType()) { 3591 CXXDestructorDecl *dtor = Record->getDestructor(); 3592 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3593 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3594 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3595 } 3596 3597 // See if a method overloads virtual methods in a base 3598 /// class without overriding any. 3599 if (!Record->isDependentType()) { 3600 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3601 MEnd = Record->method_end(); 3602 M != MEnd; ++M) { 3603 if (!(*M)->isStatic()) 3604 DiagnoseHiddenVirtualMethods(Record, *M); 3605 } 3606 } 3607 3608 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3609 // function that is not a constructor declares that member function to be 3610 // const. [...] The class of which that function is a member shall be 3611 // a literal type. 3612 // 3613 // It's fine to diagnose constructors here too: such constructors cannot 3614 // produce a constant expression, so are ill-formed (no diagnostic required). 3615 // 3616 // If the class has virtual bases, any constexpr members will already have 3617 // been diagnosed by the checks performed on the member declaration, so 3618 // suppress this (less useful) diagnostic. 3619 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3620 !Record->isLiteral() && !Record->getNumVBases()) { 3621 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3622 MEnd = Record->method_end(); 3623 M != MEnd; ++M) { 3624 if ((*M)->isConstexpr()) { 3625 switch (Record->getTemplateSpecializationKind()) { 3626 case TSK_ImplicitInstantiation: 3627 case TSK_ExplicitInstantiationDeclaration: 3628 case TSK_ExplicitInstantiationDefinition: 3629 // If a template instantiates to a non-literal type, but its members 3630 // instantiate to constexpr functions, the template is technically 3631 // ill-formed, but we allow it for sanity. Such members are treated as 3632 // non-constexpr. 3633 (*M)->setConstexpr(false); 3634 continue; 3635 3636 case TSK_Undeclared: 3637 case TSK_ExplicitSpecialization: 3638 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3639 PDiag(diag::err_constexpr_method_non_literal)); 3640 break; 3641 } 3642 3643 // Only produce one error per class. 3644 break; 3645 } 3646 } 3647 } 3648 3649 // Declare inherited constructors. We do this eagerly here because: 3650 // - The standard requires an eager diagnostic for conflicting inherited 3651 // constructors from different classes. 3652 // - The lazy declaration of the other implicit constructors is so as to not 3653 // waste space and performance on classes that are not meant to be 3654 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3655 // have inherited constructors. 3656 DeclareInheritedConstructors(Record); 3657 3658 if (!Record->isDependentType()) 3659 CheckExplicitlyDefaultedMethods(Record); 3660} 3661 3662void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3663 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3664 ME = Record->method_end(); 3665 MI != ME; ++MI) { 3666 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3667 switch (getSpecialMember(*MI)) { 3668 case CXXDefaultConstructor: 3669 CheckExplicitlyDefaultedDefaultConstructor( 3670 cast<CXXConstructorDecl>(*MI)); 3671 break; 3672 3673 case CXXDestructor: 3674 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3675 break; 3676 3677 case CXXCopyConstructor: 3678 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3679 break; 3680 3681 case CXXCopyAssignment: 3682 CheckExplicitlyDefaultedCopyAssignment(*MI); 3683 break; 3684 3685 case CXXMoveConstructor: 3686 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3687 break; 3688 3689 case CXXMoveAssignment: 3690 CheckExplicitlyDefaultedMoveAssignment(*MI); 3691 break; 3692 3693 case CXXInvalid: 3694 llvm_unreachable("non-special member explicitly defaulted!"); 3695 } 3696 } 3697 } 3698 3699} 3700 3701void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3702 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3703 3704 // Whether this was the first-declared instance of the constructor. 3705 // This affects whether we implicitly add an exception spec (and, eventually, 3706 // constexpr). It is also ill-formed to explicitly default a constructor such 3707 // that it would be deleted. (C++0x [decl.fct.def.default]) 3708 bool First = CD == CD->getCanonicalDecl(); 3709 3710 bool HadError = false; 3711 if (CD->getNumParams() != 0) { 3712 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3713 << CD->getSourceRange(); 3714 HadError = true; 3715 } 3716 3717 ImplicitExceptionSpecification Spec 3718 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3719 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3720 if (EPI.ExceptionSpecType == EST_Delayed) { 3721 // Exception specification depends on some deferred part of the class. We'll 3722 // try again when the class's definition has been fully processed. 3723 return; 3724 } 3725 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3726 *ExceptionType = Context.getFunctionType( 3727 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3728 3729 if (CtorType->hasExceptionSpec()) { 3730 if (CheckEquivalentExceptionSpec( 3731 PDiag(diag::err_incorrect_defaulted_exception_spec) 3732 << CXXDefaultConstructor, 3733 PDiag(), 3734 ExceptionType, SourceLocation(), 3735 CtorType, CD->getLocation())) { 3736 HadError = true; 3737 } 3738 } else if (First) { 3739 // We set the declaration to have the computed exception spec here. 3740 // We know there are no parameters. 3741 EPI.ExtInfo = CtorType->getExtInfo(); 3742 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3743 } 3744 3745 if (HadError) { 3746 CD->setInvalidDecl(); 3747 return; 3748 } 3749 3750 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3751 if (First) { 3752 CD->setDeletedAsWritten(); 3753 } else { 3754 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3755 << CXXDefaultConstructor; 3756 CD->setInvalidDecl(); 3757 } 3758 } 3759} 3760 3761void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3762 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3763 3764 // Whether this was the first-declared instance of the constructor. 3765 bool First = CD == CD->getCanonicalDecl(); 3766 3767 bool HadError = false; 3768 if (CD->getNumParams() != 1) { 3769 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3770 << CD->getSourceRange(); 3771 HadError = true; 3772 } 3773 3774 ImplicitExceptionSpecification Spec(Context); 3775 bool Const; 3776 llvm::tie(Spec, Const) = 3777 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3778 3779 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3780 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3781 *ExceptionType = Context.getFunctionType( 3782 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3783 3784 // Check for parameter type matching. 3785 // This is a copy ctor so we know it's a cv-qualified reference to T. 3786 QualType ArgType = CtorType->getArgType(0); 3787 if (ArgType->getPointeeType().isVolatileQualified()) { 3788 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3789 HadError = true; 3790 } 3791 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3792 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3793 HadError = true; 3794 } 3795 3796 if (CtorType->hasExceptionSpec()) { 3797 if (CheckEquivalentExceptionSpec( 3798 PDiag(diag::err_incorrect_defaulted_exception_spec) 3799 << CXXCopyConstructor, 3800 PDiag(), 3801 ExceptionType, SourceLocation(), 3802 CtorType, CD->getLocation())) { 3803 HadError = true; 3804 } 3805 } else if (First) { 3806 // We set the declaration to have the computed exception spec here. 3807 // We duplicate the one parameter type. 3808 EPI.ExtInfo = CtorType->getExtInfo(); 3809 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3810 } 3811 3812 if (HadError) { 3813 CD->setInvalidDecl(); 3814 return; 3815 } 3816 3817 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3818 if (First) { 3819 CD->setDeletedAsWritten(); 3820 } else { 3821 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3822 << CXXCopyConstructor; 3823 CD->setInvalidDecl(); 3824 } 3825 } 3826} 3827 3828void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3829 assert(MD->isExplicitlyDefaulted()); 3830 3831 // Whether this was the first-declared instance of the operator 3832 bool First = MD == MD->getCanonicalDecl(); 3833 3834 bool HadError = false; 3835 if (MD->getNumParams() != 1) { 3836 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3837 << MD->getSourceRange(); 3838 HadError = true; 3839 } 3840 3841 QualType ReturnType = 3842 MD->getType()->getAs<FunctionType>()->getResultType(); 3843 if (!ReturnType->isLValueReferenceType() || 3844 !Context.hasSameType( 3845 Context.getCanonicalType(ReturnType->getPointeeType()), 3846 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3847 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3848 HadError = true; 3849 } 3850 3851 ImplicitExceptionSpecification Spec(Context); 3852 bool Const; 3853 llvm::tie(Spec, Const) = 3854 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3855 3856 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3857 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3858 *ExceptionType = Context.getFunctionType( 3859 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3860 3861 QualType ArgType = OperType->getArgType(0); 3862 if (!ArgType->isLValueReferenceType()) { 3863 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3864 HadError = true; 3865 } else { 3866 if (ArgType->getPointeeType().isVolatileQualified()) { 3867 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3868 HadError = true; 3869 } 3870 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3871 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3872 HadError = true; 3873 } 3874 } 3875 3876 if (OperType->getTypeQuals()) { 3877 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3878 HadError = true; 3879 } 3880 3881 if (OperType->hasExceptionSpec()) { 3882 if (CheckEquivalentExceptionSpec( 3883 PDiag(diag::err_incorrect_defaulted_exception_spec) 3884 << CXXCopyAssignment, 3885 PDiag(), 3886 ExceptionType, SourceLocation(), 3887 OperType, MD->getLocation())) { 3888 HadError = true; 3889 } 3890 } else if (First) { 3891 // We set the declaration to have the computed exception spec here. 3892 // We duplicate the one parameter type. 3893 EPI.RefQualifier = OperType->getRefQualifier(); 3894 EPI.ExtInfo = OperType->getExtInfo(); 3895 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3896 } 3897 3898 if (HadError) { 3899 MD->setInvalidDecl(); 3900 return; 3901 } 3902 3903 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3904 if (First) { 3905 MD->setDeletedAsWritten(); 3906 } else { 3907 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3908 << CXXCopyAssignment; 3909 MD->setInvalidDecl(); 3910 } 3911 } 3912} 3913 3914void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3915 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3916 3917 // Whether this was the first-declared instance of the constructor. 3918 bool First = CD == CD->getCanonicalDecl(); 3919 3920 bool HadError = false; 3921 if (CD->getNumParams() != 1) { 3922 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3923 << CD->getSourceRange(); 3924 HadError = true; 3925 } 3926 3927 ImplicitExceptionSpecification Spec( 3928 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3929 3930 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3931 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3932 *ExceptionType = Context.getFunctionType( 3933 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3934 3935 // Check for parameter type matching. 3936 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3937 QualType ArgType = CtorType->getArgType(0); 3938 if (ArgType->getPointeeType().isVolatileQualified()) { 3939 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3940 HadError = true; 3941 } 3942 if (ArgType->getPointeeType().isConstQualified()) { 3943 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3944 HadError = true; 3945 } 3946 3947 if (CtorType->hasExceptionSpec()) { 3948 if (CheckEquivalentExceptionSpec( 3949 PDiag(diag::err_incorrect_defaulted_exception_spec) 3950 << CXXMoveConstructor, 3951 PDiag(), 3952 ExceptionType, SourceLocation(), 3953 CtorType, CD->getLocation())) { 3954 HadError = true; 3955 } 3956 } else if (First) { 3957 // We set the declaration to have the computed exception spec here. 3958 // We duplicate the one parameter type. 3959 EPI.ExtInfo = CtorType->getExtInfo(); 3960 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3961 } 3962 3963 if (HadError) { 3964 CD->setInvalidDecl(); 3965 return; 3966 } 3967 3968 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3969 if (First) { 3970 CD->setDeletedAsWritten(); 3971 } else { 3972 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3973 << CXXMoveConstructor; 3974 CD->setInvalidDecl(); 3975 } 3976 } 3977} 3978 3979void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3980 assert(MD->isExplicitlyDefaulted()); 3981 3982 // Whether this was the first-declared instance of the operator 3983 bool First = MD == MD->getCanonicalDecl(); 3984 3985 bool HadError = false; 3986 if (MD->getNumParams() != 1) { 3987 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3988 << MD->getSourceRange(); 3989 HadError = true; 3990 } 3991 3992 QualType ReturnType = 3993 MD->getType()->getAs<FunctionType>()->getResultType(); 3994 if (!ReturnType->isLValueReferenceType() || 3995 !Context.hasSameType( 3996 Context.getCanonicalType(ReturnType->getPointeeType()), 3997 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3998 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3999 HadError = true; 4000 } 4001 4002 ImplicitExceptionSpecification Spec( 4003 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4004 4005 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4006 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4007 *ExceptionType = Context.getFunctionType( 4008 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4009 4010 QualType ArgType = OperType->getArgType(0); 4011 if (!ArgType->isRValueReferenceType()) { 4012 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4013 HadError = true; 4014 } else { 4015 if (ArgType->getPointeeType().isVolatileQualified()) { 4016 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4017 HadError = true; 4018 } 4019 if (ArgType->getPointeeType().isConstQualified()) { 4020 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4021 HadError = true; 4022 } 4023 } 4024 4025 if (OperType->getTypeQuals()) { 4026 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4027 HadError = true; 4028 } 4029 4030 if (OperType->hasExceptionSpec()) { 4031 if (CheckEquivalentExceptionSpec( 4032 PDiag(diag::err_incorrect_defaulted_exception_spec) 4033 << CXXMoveAssignment, 4034 PDiag(), 4035 ExceptionType, SourceLocation(), 4036 OperType, MD->getLocation())) { 4037 HadError = true; 4038 } 4039 } else if (First) { 4040 // We set the declaration to have the computed exception spec here. 4041 // We duplicate the one parameter type. 4042 EPI.RefQualifier = OperType->getRefQualifier(); 4043 EPI.ExtInfo = OperType->getExtInfo(); 4044 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4045 } 4046 4047 if (HadError) { 4048 MD->setInvalidDecl(); 4049 return; 4050 } 4051 4052 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4053 if (First) { 4054 MD->setDeletedAsWritten(); 4055 } else { 4056 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4057 << CXXMoveAssignment; 4058 MD->setInvalidDecl(); 4059 } 4060 } 4061} 4062 4063void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4064 assert(DD->isExplicitlyDefaulted()); 4065 4066 // Whether this was the first-declared instance of the destructor. 4067 bool First = DD == DD->getCanonicalDecl(); 4068 4069 ImplicitExceptionSpecification Spec 4070 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4071 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4072 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4073 *ExceptionType = Context.getFunctionType( 4074 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4075 4076 if (DtorType->hasExceptionSpec()) { 4077 if (CheckEquivalentExceptionSpec( 4078 PDiag(diag::err_incorrect_defaulted_exception_spec) 4079 << CXXDestructor, 4080 PDiag(), 4081 ExceptionType, SourceLocation(), 4082 DtorType, DD->getLocation())) { 4083 DD->setInvalidDecl(); 4084 return; 4085 } 4086 } else if (First) { 4087 // We set the declaration to have the computed exception spec here. 4088 // There are no parameters. 4089 EPI.ExtInfo = DtorType->getExtInfo(); 4090 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4091 } 4092 4093 if (ShouldDeleteDestructor(DD)) { 4094 if (First) { 4095 DD->setDeletedAsWritten(); 4096 } else { 4097 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4098 << CXXDestructor; 4099 DD->setInvalidDecl(); 4100 } 4101 } 4102} 4103 4104/// This function implements the following C++0x paragraphs: 4105/// - [class.ctor]/5 4106/// - [class.copy]/11 4107bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4108 assert(!MD->isInvalidDecl()); 4109 CXXRecordDecl *RD = MD->getParent(); 4110 assert(!RD->isDependentType() && "do deletion after instantiation"); 4111 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4112 return false; 4113 4114 bool IsUnion = RD->isUnion(); 4115 bool IsConstructor = false; 4116 bool IsAssignment = false; 4117 bool IsMove = false; 4118 4119 bool ConstArg = false; 4120 4121 switch (CSM) { 4122 case CXXDefaultConstructor: 4123 IsConstructor = true; 4124 break; 4125 case CXXCopyConstructor: 4126 IsConstructor = true; 4127 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4128 break; 4129 case CXXMoveConstructor: 4130 IsConstructor = true; 4131 IsMove = true; 4132 break; 4133 default: 4134 llvm_unreachable("function only currently implemented for default ctors"); 4135 } 4136 4137 SourceLocation Loc = MD->getLocation(); 4138 4139 // Do access control from the special member function 4140 ContextRAII MethodContext(*this, MD); 4141 4142 bool AllConst = true; 4143 4144 // We do this because we should never actually use an anonymous 4145 // union's constructor. 4146 if (IsUnion && RD->isAnonymousStructOrUnion()) 4147 return false; 4148 4149 // FIXME: We should put some diagnostic logic right into this function. 4150 4151 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4152 BE = RD->bases_end(); 4153 BI != BE; ++BI) { 4154 // We'll handle this one later 4155 if (BI->isVirtual()) 4156 continue; 4157 4158 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4159 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4160 4161 // Unless we have an assignment operator, the base's destructor must 4162 // be accessible and not deleted. 4163 if (!IsAssignment) { 4164 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4165 if (BaseDtor->isDeleted()) 4166 return true; 4167 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4168 AR_accessible) 4169 return true; 4170 } 4171 4172 // Finding the corresponding member in the base should lead to a 4173 // unique, accessible, non-deleted function. If we are doing 4174 // a destructor, we have already checked this case. 4175 if (CSM != CXXDestructor) { 4176 SpecialMemberOverloadResult *SMOR = 4177 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4178 false); 4179 if (!SMOR->hasSuccess()) 4180 return true; 4181 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4182 if (IsConstructor) { 4183 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4184 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4185 PDiag()) != AR_accessible) 4186 return true; 4187 4188 // For a move operation, the corresponding operation must actually 4189 // be a move operation (and not a copy selected by overload 4190 // resolution) unless we are working on a trivially copyable class. 4191 if (IsMove && !BaseCtor->isMoveConstructor() && 4192 !BaseDecl->isTriviallyCopyable()) 4193 return true; 4194 } 4195 } 4196 } 4197 4198 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4199 BE = RD->vbases_end(); 4200 BI != BE; ++BI) { 4201 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4202 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4203 4204 // Unless we have an assignment operator, the base's destructor must 4205 // be accessible and not deleted. 4206 if (!IsAssignment) { 4207 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4208 if (BaseDtor->isDeleted()) 4209 return true; 4210 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4211 AR_accessible) 4212 return true; 4213 } 4214 4215 // Finding the corresponding member in the base should lead to a 4216 // unique, accessible, non-deleted function. 4217 if (CSM != CXXDestructor) { 4218 SpecialMemberOverloadResult *SMOR = 4219 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4220 false); 4221 if (!SMOR->hasSuccess()) 4222 return true; 4223 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4224 if (IsConstructor) { 4225 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4226 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4227 PDiag()) != AR_accessible) 4228 return true; 4229 4230 // For a move operation, the corresponding operation must actually 4231 // be a move operation (and not a copy selected by overload 4232 // resolution) unless we are working on a trivially copyable class. 4233 if (IsMove && !BaseCtor->isMoveConstructor() && 4234 !BaseDecl->isTriviallyCopyable()) 4235 return true; 4236 } 4237 } 4238 } 4239 4240 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4241 FE = RD->field_end(); 4242 FI != FE; ++FI) { 4243 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4244 continue; 4245 4246 QualType FieldType = Context.getBaseElementType(FI->getType()); 4247 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4248 4249 // For a default constructor, all references must be initialized in-class 4250 // and, if a union, it must have a non-const member. 4251 if (CSM == CXXDefaultConstructor) { 4252 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4253 return true; 4254 4255 if (IsUnion && !FieldType.isConstQualified()) 4256 AllConst = false; 4257 // For a copy constructor, data members must not be of rvalue reference 4258 // type. 4259 } else if (CSM == CXXCopyConstructor) { 4260 if (FieldType->isRValueReferenceType()) 4261 return true; 4262 } 4263 4264 if (FieldRecord) { 4265 // For a default constructor, a const member must have a user-provided 4266 // default constructor or else be explicitly initialized. 4267 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4268 !FI->hasInClassInitializer() && 4269 !FieldRecord->hasUserProvidedDefaultConstructor()) 4270 return true; 4271 4272 // Some additional restrictions exist on the variant members. 4273 if (!IsUnion && FieldRecord->isUnion() && 4274 FieldRecord->isAnonymousStructOrUnion()) { 4275 // We're okay to reuse AllConst here since we only care about the 4276 // value otherwise if we're in a union. 4277 AllConst = true; 4278 4279 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4280 UE = FieldRecord->field_end(); 4281 UI != UE; ++UI) { 4282 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4283 CXXRecordDecl *UnionFieldRecord = 4284 UnionFieldType->getAsCXXRecordDecl(); 4285 4286 if (!UnionFieldType.isConstQualified()) 4287 AllConst = false; 4288 4289 if (UnionFieldRecord) { 4290 // FIXME: Checking for accessibility and validity of this 4291 // destructor is technically going beyond the 4292 // standard, but this is believed to be a defect. 4293 if (!IsAssignment) { 4294 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4295 if (FieldDtor->isDeleted()) 4296 return true; 4297 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4298 AR_accessible) 4299 return true; 4300 if (!FieldDtor->isTrivial()) 4301 return true; 4302 } 4303 4304 if (CSM != CXXDestructor) { 4305 SpecialMemberOverloadResult *SMOR = 4306 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4307 false, false, false); 4308 // FIXME: Checking for accessibility and validity of this 4309 // corresponding member is technically going beyond the 4310 // standard, but this is believed to be a defect. 4311 if (!SMOR->hasSuccess()) 4312 return true; 4313 4314 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4315 // A member of a union must have a trivial corresponding 4316 // constructor. 4317 if (!FieldMember->isTrivial()) 4318 return true; 4319 4320 if (IsConstructor) { 4321 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4322 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4323 PDiag()) != AR_accessible) 4324 return true; 4325 } 4326 } 4327 } 4328 } 4329 4330 // At least one member in each anonymous union must be non-const 4331 if (CSM == CXXDefaultConstructor && AllConst) 4332 return true; 4333 4334 // Don't try to initialize the anonymous union 4335 // This is technically non-conformant, but sanity demands it. 4336 continue; 4337 } 4338 4339 // Unless we're doing assignment, the field's destructor must be 4340 // accessible and not deleted. 4341 if (!IsAssignment) { 4342 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4343 if (FieldDtor->isDeleted()) 4344 return true; 4345 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4346 AR_accessible) 4347 return true; 4348 } 4349 4350 // Check that the corresponding member of the field is accessible, 4351 // unique, and non-deleted. We don't do this if it has an explicit 4352 // initialization when default-constructing. 4353 if (CSM != CXXDestructor && 4354 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4355 SpecialMemberOverloadResult *SMOR = 4356 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4357 false); 4358 if (!SMOR->hasSuccess()) 4359 return true; 4360 4361 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4362 if (IsConstructor) { 4363 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4364 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4365 PDiag()) != AR_accessible) 4366 return true; 4367 4368 // For a move operation, the corresponding operation must actually 4369 // be a move operation (and not a copy selected by overload 4370 // resolution) unless we are working on a trivially copyable class. 4371 if (IsMove && !FieldCtor->isMoveConstructor() && 4372 !FieldRecord->isTriviallyCopyable()) 4373 return true; 4374 } 4375 4376 // We need the corresponding member of a union to be trivial so that 4377 // we can safely copy them all simultaneously. 4378 // FIXME: Note that performing the check here (where we rely on the lack 4379 // of an in-class initializer) is technically ill-formed. However, this 4380 // seems most obviously to be a bug in the standard. 4381 if (IsUnion && !FieldMember->isTrivial()) 4382 return true; 4383 } 4384 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4385 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4386 // We can't initialize a const member of non-class type to any value. 4387 return true; 4388 } 4389 } 4390 4391 // We can't have all const members in a union when default-constructing, 4392 // or else they're all nonsensical garbage values that can't be changed. 4393 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4394 return true; 4395 4396 return false; 4397} 4398 4399bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4400 CXXRecordDecl *RD = MD->getParent(); 4401 assert(!RD->isDependentType() && "do deletion after instantiation"); 4402 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4403 return false; 4404 4405 SourceLocation Loc = MD->getLocation(); 4406 4407 // Do access control from the constructor 4408 ContextRAII MethodContext(*this, MD); 4409 4410 bool Union = RD->isUnion(); 4411 4412 unsigned ArgQuals = 4413 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4414 Qualifiers::Const : 0; 4415 4416 // We do this because we should never actually use an anonymous 4417 // union's constructor. 4418 if (Union && RD->isAnonymousStructOrUnion()) 4419 return false; 4420 4421 // FIXME: We should put some diagnostic logic right into this function. 4422 4423 // C++0x [class.copy]/20 4424 // A defaulted [copy] assignment operator for class X is defined as deleted 4425 // if X has: 4426 4427 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4428 BE = RD->bases_end(); 4429 BI != BE; ++BI) { 4430 // We'll handle this one later 4431 if (BI->isVirtual()) 4432 continue; 4433 4434 QualType BaseType = BI->getType(); 4435 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4436 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4437 4438 // -- a [direct base class] B that cannot be [copied] because overload 4439 // resolution, as applied to B's [copy] assignment operator, results in 4440 // an ambiguity or a function that is deleted or inaccessible from the 4441 // assignment operator 4442 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4443 0); 4444 if (!CopyOper || CopyOper->isDeleted()) 4445 return true; 4446 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4447 return true; 4448 } 4449 4450 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4451 BE = RD->vbases_end(); 4452 BI != BE; ++BI) { 4453 QualType BaseType = BI->getType(); 4454 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4455 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4456 4457 // -- a [virtual base class] B that cannot be [copied] because overload 4458 // resolution, as applied to B's [copy] assignment operator, results in 4459 // an ambiguity or a function that is deleted or inaccessible from the 4460 // assignment operator 4461 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4462 0); 4463 if (!CopyOper || CopyOper->isDeleted()) 4464 return true; 4465 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4466 return true; 4467 } 4468 4469 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4470 FE = RD->field_end(); 4471 FI != FE; ++FI) { 4472 if (FI->isUnnamedBitfield()) 4473 continue; 4474 4475 QualType FieldType = Context.getBaseElementType(FI->getType()); 4476 4477 // -- a non-static data member of reference type 4478 if (FieldType->isReferenceType()) 4479 return true; 4480 4481 // -- a non-static data member of const non-class type (or array thereof) 4482 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4483 return true; 4484 4485 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4486 4487 if (FieldRecord) { 4488 // This is an anonymous union 4489 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4490 // Anonymous unions inside unions do not variant members create 4491 if (!Union) { 4492 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4493 UE = FieldRecord->field_end(); 4494 UI != UE; ++UI) { 4495 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4496 CXXRecordDecl *UnionFieldRecord = 4497 UnionFieldType->getAsCXXRecordDecl(); 4498 4499 // -- a variant member with a non-trivial [copy] assignment operator 4500 // and X is a union-like class 4501 if (UnionFieldRecord && 4502 !UnionFieldRecord->hasTrivialCopyAssignment()) 4503 return true; 4504 } 4505 } 4506 4507 // Don't try to initalize an anonymous union 4508 continue; 4509 // -- a variant member with a non-trivial [copy] assignment operator 4510 // and X is a union-like class 4511 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4512 return true; 4513 } 4514 4515 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4516 false, 0); 4517 if (!CopyOper || CopyOper->isDeleted()) 4518 return true; 4519 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4520 return true; 4521 } 4522 } 4523 4524 return false; 4525} 4526 4527bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4528 CXXRecordDecl *RD = MD->getParent(); 4529 assert(!RD->isDependentType() && "do deletion after instantiation"); 4530 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4531 return false; 4532 4533 SourceLocation Loc = MD->getLocation(); 4534 4535 // Do access control from the constructor 4536 ContextRAII MethodContext(*this, MD); 4537 4538 bool Union = RD->isUnion(); 4539 4540 // We do this because we should never actually use an anonymous 4541 // union's constructor. 4542 if (Union && RD->isAnonymousStructOrUnion()) 4543 return false; 4544 4545 // C++0x [class.copy]/20 4546 // A defaulted [move] assignment operator for class X is defined as deleted 4547 // if X has: 4548 4549 // -- for the move constructor, [...] any direct or indirect virtual base 4550 // class. 4551 if (RD->getNumVBases() != 0) 4552 return true; 4553 4554 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4555 BE = RD->bases_end(); 4556 BI != BE; ++BI) { 4557 4558 QualType BaseType = BI->getType(); 4559 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4560 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4561 4562 // -- a [direct base class] B that cannot be [moved] because overload 4563 // resolution, as applied to B's [move] assignment operator, results in 4564 // an ambiguity or a function that is deleted or inaccessible from the 4565 // assignment operator 4566 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4567 if (!MoveOper || MoveOper->isDeleted()) 4568 return true; 4569 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4570 return true; 4571 4572 // -- for the move assignment operator, a [direct base class] with a type 4573 // that does not have a move assignment operator and is not trivially 4574 // copyable. 4575 if (!MoveOper->isMoveAssignmentOperator() && 4576 !BaseDecl->isTriviallyCopyable()) 4577 return true; 4578 } 4579 4580 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4581 FE = RD->field_end(); 4582 FI != FE; ++FI) { 4583 if (FI->isUnnamedBitfield()) 4584 continue; 4585 4586 QualType FieldType = Context.getBaseElementType(FI->getType()); 4587 4588 // -- a non-static data member of reference type 4589 if (FieldType->isReferenceType()) 4590 return true; 4591 4592 // -- a non-static data member of const non-class type (or array thereof) 4593 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4594 return true; 4595 4596 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4597 4598 if (FieldRecord) { 4599 // This is an anonymous union 4600 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4601 // Anonymous unions inside unions do not variant members create 4602 if (!Union) { 4603 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4604 UE = FieldRecord->field_end(); 4605 UI != UE; ++UI) { 4606 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4607 CXXRecordDecl *UnionFieldRecord = 4608 UnionFieldType->getAsCXXRecordDecl(); 4609 4610 // -- a variant member with a non-trivial [move] assignment operator 4611 // and X is a union-like class 4612 if (UnionFieldRecord && 4613 !UnionFieldRecord->hasTrivialMoveAssignment()) 4614 return true; 4615 } 4616 } 4617 4618 // Don't try to initalize an anonymous union 4619 continue; 4620 // -- a variant member with a non-trivial [move] assignment operator 4621 // and X is a union-like class 4622 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4623 return true; 4624 } 4625 4626 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4627 if (!MoveOper || MoveOper->isDeleted()) 4628 return true; 4629 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4630 return true; 4631 4632 // -- for the move assignment operator, a [non-static data member] with a 4633 // type that does not have a move assignment operator and is not 4634 // trivially copyable. 4635 if (!MoveOper->isMoveAssignmentOperator() && 4636 !FieldRecord->isTriviallyCopyable()) 4637 return true; 4638 } 4639 } 4640 4641 return false; 4642} 4643 4644bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4645 CXXRecordDecl *RD = DD->getParent(); 4646 assert(!RD->isDependentType() && "do deletion after instantiation"); 4647 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4648 return false; 4649 4650 SourceLocation Loc = DD->getLocation(); 4651 4652 // Do access control from the destructor 4653 ContextRAII CtorContext(*this, DD); 4654 4655 bool Union = RD->isUnion(); 4656 4657 // We do this because we should never actually use an anonymous 4658 // union's destructor. 4659 if (Union && RD->isAnonymousStructOrUnion()) 4660 return false; 4661 4662 // C++0x [class.dtor]p5 4663 // A defaulted destructor for a class X is defined as deleted if: 4664 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4665 BE = RD->bases_end(); 4666 BI != BE; ++BI) { 4667 // We'll handle this one later 4668 if (BI->isVirtual()) 4669 continue; 4670 4671 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4672 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4673 assert(BaseDtor && "base has no destructor"); 4674 4675 // -- any direct or virtual base class has a deleted destructor or 4676 // a destructor that is inaccessible from the defaulted destructor 4677 if (BaseDtor->isDeleted()) 4678 return true; 4679 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4680 AR_accessible) 4681 return true; 4682 } 4683 4684 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4685 BE = RD->vbases_end(); 4686 BI != BE; ++BI) { 4687 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4688 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4689 assert(BaseDtor && "base has no destructor"); 4690 4691 // -- any direct or virtual base class has a deleted destructor or 4692 // a destructor that is inaccessible from the defaulted destructor 4693 if (BaseDtor->isDeleted()) 4694 return true; 4695 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4696 AR_accessible) 4697 return true; 4698 } 4699 4700 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4701 FE = RD->field_end(); 4702 FI != FE; ++FI) { 4703 QualType FieldType = Context.getBaseElementType(FI->getType()); 4704 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4705 if (FieldRecord) { 4706 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4707 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4708 UE = FieldRecord->field_end(); 4709 UI != UE; ++UI) { 4710 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4711 CXXRecordDecl *UnionFieldRecord = 4712 UnionFieldType->getAsCXXRecordDecl(); 4713 4714 // -- X is a union-like class that has a variant member with a non- 4715 // trivial destructor. 4716 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4717 return true; 4718 } 4719 // Technically we are supposed to do this next check unconditionally. 4720 // But that makes absolutely no sense. 4721 } else { 4722 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4723 4724 // -- any of the non-static data members has class type M (or array 4725 // thereof) and M has a deleted destructor or a destructor that is 4726 // inaccessible from the defaulted destructor 4727 if (FieldDtor->isDeleted()) 4728 return true; 4729 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4730 AR_accessible) 4731 return true; 4732 4733 // -- X is a union-like class that has a variant member with a non- 4734 // trivial destructor. 4735 if (Union && !FieldDtor->isTrivial()) 4736 return true; 4737 } 4738 } 4739 } 4740 4741 if (DD->isVirtual()) { 4742 FunctionDecl *OperatorDelete = 0; 4743 DeclarationName Name = 4744 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4745 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4746 false)) 4747 return true; 4748 } 4749 4750 4751 return false; 4752} 4753 4754/// \brief Data used with FindHiddenVirtualMethod 4755namespace { 4756 struct FindHiddenVirtualMethodData { 4757 Sema *S; 4758 CXXMethodDecl *Method; 4759 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4760 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4761 }; 4762} 4763 4764/// \brief Member lookup function that determines whether a given C++ 4765/// method overloads virtual methods in a base class without overriding any, 4766/// to be used with CXXRecordDecl::lookupInBases(). 4767static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4768 CXXBasePath &Path, 4769 void *UserData) { 4770 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4771 4772 FindHiddenVirtualMethodData &Data 4773 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4774 4775 DeclarationName Name = Data.Method->getDeclName(); 4776 assert(Name.getNameKind() == DeclarationName::Identifier); 4777 4778 bool foundSameNameMethod = false; 4779 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4780 for (Path.Decls = BaseRecord->lookup(Name); 4781 Path.Decls.first != Path.Decls.second; 4782 ++Path.Decls.first) { 4783 NamedDecl *D = *Path.Decls.first; 4784 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4785 MD = MD->getCanonicalDecl(); 4786 foundSameNameMethod = true; 4787 // Interested only in hidden virtual methods. 4788 if (!MD->isVirtual()) 4789 continue; 4790 // If the method we are checking overrides a method from its base 4791 // don't warn about the other overloaded methods. 4792 if (!Data.S->IsOverload(Data.Method, MD, false)) 4793 return true; 4794 // Collect the overload only if its hidden. 4795 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4796 overloadedMethods.push_back(MD); 4797 } 4798 } 4799 4800 if (foundSameNameMethod) 4801 Data.OverloadedMethods.append(overloadedMethods.begin(), 4802 overloadedMethods.end()); 4803 return foundSameNameMethod; 4804} 4805 4806/// \brief See if a method overloads virtual methods in a base class without 4807/// overriding any. 4808void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4809 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4810 MD->getLocation()) == DiagnosticsEngine::Ignored) 4811 return; 4812 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4813 return; 4814 4815 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4816 /*bool RecordPaths=*/false, 4817 /*bool DetectVirtual=*/false); 4818 FindHiddenVirtualMethodData Data; 4819 Data.Method = MD; 4820 Data.S = this; 4821 4822 // Keep the base methods that were overriden or introduced in the subclass 4823 // by 'using' in a set. A base method not in this set is hidden. 4824 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4825 res.first != res.second; ++res.first) { 4826 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4827 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4828 E = MD->end_overridden_methods(); 4829 I != E; ++I) 4830 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4831 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4832 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4833 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4834 } 4835 4836 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4837 !Data.OverloadedMethods.empty()) { 4838 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4839 << MD << (Data.OverloadedMethods.size() > 1); 4840 4841 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4842 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4843 Diag(overloadedMD->getLocation(), 4844 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4845 } 4846 } 4847} 4848 4849void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4850 Decl *TagDecl, 4851 SourceLocation LBrac, 4852 SourceLocation RBrac, 4853 AttributeList *AttrList) { 4854 if (!TagDecl) 4855 return; 4856 4857 AdjustDeclIfTemplate(TagDecl); 4858 4859 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4860 // strict aliasing violation! 4861 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4862 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4863 4864 CheckCompletedCXXClass( 4865 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4866} 4867 4868/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4869/// special functions, such as the default constructor, copy 4870/// constructor, or destructor, to the given C++ class (C++ 4871/// [special]p1). This routine can only be executed just before the 4872/// definition of the class is complete. 4873void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4874 if (!ClassDecl->hasUserDeclaredConstructor()) 4875 ++ASTContext::NumImplicitDefaultConstructors; 4876 4877 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4878 ++ASTContext::NumImplicitCopyConstructors; 4879 4880 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4881 ++ASTContext::NumImplicitCopyAssignmentOperators; 4882 4883 // If we have a dynamic class, then the copy assignment operator may be 4884 // virtual, so we have to declare it immediately. This ensures that, e.g., 4885 // it shows up in the right place in the vtable and that we diagnose 4886 // problems with the implicit exception specification. 4887 if (ClassDecl->isDynamicClass()) 4888 DeclareImplicitCopyAssignment(ClassDecl); 4889 } 4890 4891 if (!ClassDecl->hasUserDeclaredDestructor()) { 4892 ++ASTContext::NumImplicitDestructors; 4893 4894 // If we have a dynamic class, then the destructor may be virtual, so we 4895 // have to declare the destructor immediately. This ensures that, e.g., it 4896 // shows up in the right place in the vtable and that we diagnose problems 4897 // with the implicit exception specification. 4898 if (ClassDecl->isDynamicClass()) 4899 DeclareImplicitDestructor(ClassDecl); 4900 } 4901} 4902 4903void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4904 if (!D) 4905 return; 4906 4907 int NumParamList = D->getNumTemplateParameterLists(); 4908 for (int i = 0; i < NumParamList; i++) { 4909 TemplateParameterList* Params = D->getTemplateParameterList(i); 4910 for (TemplateParameterList::iterator Param = Params->begin(), 4911 ParamEnd = Params->end(); 4912 Param != ParamEnd; ++Param) { 4913 NamedDecl *Named = cast<NamedDecl>(*Param); 4914 if (Named->getDeclName()) { 4915 S->AddDecl(Named); 4916 IdResolver.AddDecl(Named); 4917 } 4918 } 4919 } 4920} 4921 4922void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4923 if (!D) 4924 return; 4925 4926 TemplateParameterList *Params = 0; 4927 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4928 Params = Template->getTemplateParameters(); 4929 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4930 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4931 Params = PartialSpec->getTemplateParameters(); 4932 else 4933 return; 4934 4935 for (TemplateParameterList::iterator Param = Params->begin(), 4936 ParamEnd = Params->end(); 4937 Param != ParamEnd; ++Param) { 4938 NamedDecl *Named = cast<NamedDecl>(*Param); 4939 if (Named->getDeclName()) { 4940 S->AddDecl(Named); 4941 IdResolver.AddDecl(Named); 4942 } 4943 } 4944} 4945 4946void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4947 if (!RecordD) return; 4948 AdjustDeclIfTemplate(RecordD); 4949 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4950 PushDeclContext(S, Record); 4951} 4952 4953void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4954 if (!RecordD) return; 4955 PopDeclContext(); 4956} 4957 4958/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4959/// parsing a top-level (non-nested) C++ class, and we are now 4960/// parsing those parts of the given Method declaration that could 4961/// not be parsed earlier (C++ [class.mem]p2), such as default 4962/// arguments. This action should enter the scope of the given 4963/// Method declaration as if we had just parsed the qualified method 4964/// name. However, it should not bring the parameters into scope; 4965/// that will be performed by ActOnDelayedCXXMethodParameter. 4966void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4967} 4968 4969/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4970/// C++ method declaration. We're (re-)introducing the given 4971/// function parameter into scope for use in parsing later parts of 4972/// the method declaration. For example, we could see an 4973/// ActOnParamDefaultArgument event for this parameter. 4974void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4975 if (!ParamD) 4976 return; 4977 4978 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4979 4980 // If this parameter has an unparsed default argument, clear it out 4981 // to make way for the parsed default argument. 4982 if (Param->hasUnparsedDefaultArg()) 4983 Param->setDefaultArg(0); 4984 4985 S->AddDecl(Param); 4986 if (Param->getDeclName()) 4987 IdResolver.AddDecl(Param); 4988} 4989 4990/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4991/// processing the delayed method declaration for Method. The method 4992/// declaration is now considered finished. There may be a separate 4993/// ActOnStartOfFunctionDef action later (not necessarily 4994/// immediately!) for this method, if it was also defined inside the 4995/// class body. 4996void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4997 if (!MethodD) 4998 return; 4999 5000 AdjustDeclIfTemplate(MethodD); 5001 5002 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5003 5004 // Now that we have our default arguments, check the constructor 5005 // again. It could produce additional diagnostics or affect whether 5006 // the class has implicitly-declared destructors, among other 5007 // things. 5008 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5009 CheckConstructor(Constructor); 5010 5011 // Check the default arguments, which we may have added. 5012 if (!Method->isInvalidDecl()) 5013 CheckCXXDefaultArguments(Method); 5014} 5015 5016/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5017/// the well-formedness of the constructor declarator @p D with type @p 5018/// R. If there are any errors in the declarator, this routine will 5019/// emit diagnostics and set the invalid bit to true. In any case, the type 5020/// will be updated to reflect a well-formed type for the constructor and 5021/// returned. 5022QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5023 StorageClass &SC) { 5024 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5025 5026 // C++ [class.ctor]p3: 5027 // A constructor shall not be virtual (10.3) or static (9.4). A 5028 // constructor can be invoked for a const, volatile or const 5029 // volatile object. A constructor shall not be declared const, 5030 // volatile, or const volatile (9.3.2). 5031 if (isVirtual) { 5032 if (!D.isInvalidType()) 5033 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5034 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5035 << SourceRange(D.getIdentifierLoc()); 5036 D.setInvalidType(); 5037 } 5038 if (SC == SC_Static) { 5039 if (!D.isInvalidType()) 5040 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5041 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5042 << SourceRange(D.getIdentifierLoc()); 5043 D.setInvalidType(); 5044 SC = SC_None; 5045 } 5046 5047 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5048 if (FTI.TypeQuals != 0) { 5049 if (FTI.TypeQuals & Qualifiers::Const) 5050 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5051 << "const" << SourceRange(D.getIdentifierLoc()); 5052 if (FTI.TypeQuals & Qualifiers::Volatile) 5053 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5054 << "volatile" << SourceRange(D.getIdentifierLoc()); 5055 if (FTI.TypeQuals & Qualifiers::Restrict) 5056 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5057 << "restrict" << SourceRange(D.getIdentifierLoc()); 5058 D.setInvalidType(); 5059 } 5060 5061 // C++0x [class.ctor]p4: 5062 // A constructor shall not be declared with a ref-qualifier. 5063 if (FTI.hasRefQualifier()) { 5064 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5065 << FTI.RefQualifierIsLValueRef 5066 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5067 D.setInvalidType(); 5068 } 5069 5070 // Rebuild the function type "R" without any type qualifiers (in 5071 // case any of the errors above fired) and with "void" as the 5072 // return type, since constructors don't have return types. 5073 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5074 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5075 return R; 5076 5077 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5078 EPI.TypeQuals = 0; 5079 EPI.RefQualifier = RQ_None; 5080 5081 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5082 Proto->getNumArgs(), EPI); 5083} 5084 5085/// CheckConstructor - Checks a fully-formed constructor for 5086/// well-formedness, issuing any diagnostics required. Returns true if 5087/// the constructor declarator is invalid. 5088void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5089 CXXRecordDecl *ClassDecl 5090 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5091 if (!ClassDecl) 5092 return Constructor->setInvalidDecl(); 5093 5094 // C++ [class.copy]p3: 5095 // A declaration of a constructor for a class X is ill-formed if 5096 // its first parameter is of type (optionally cv-qualified) X and 5097 // either there are no other parameters or else all other 5098 // parameters have default arguments. 5099 if (!Constructor->isInvalidDecl() && 5100 ((Constructor->getNumParams() == 1) || 5101 (Constructor->getNumParams() > 1 && 5102 Constructor->getParamDecl(1)->hasDefaultArg())) && 5103 Constructor->getTemplateSpecializationKind() 5104 != TSK_ImplicitInstantiation) { 5105 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5106 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5107 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5108 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5109 const char *ConstRef 5110 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5111 : " const &"; 5112 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5113 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5114 5115 // FIXME: Rather that making the constructor invalid, we should endeavor 5116 // to fix the type. 5117 Constructor->setInvalidDecl(); 5118 } 5119 } 5120} 5121 5122/// CheckDestructor - Checks a fully-formed destructor definition for 5123/// well-formedness, issuing any diagnostics required. Returns true 5124/// on error. 5125bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5126 CXXRecordDecl *RD = Destructor->getParent(); 5127 5128 if (Destructor->isVirtual()) { 5129 SourceLocation Loc; 5130 5131 if (!Destructor->isImplicit()) 5132 Loc = Destructor->getLocation(); 5133 else 5134 Loc = RD->getLocation(); 5135 5136 // If we have a virtual destructor, look up the deallocation function 5137 FunctionDecl *OperatorDelete = 0; 5138 DeclarationName Name = 5139 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5140 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5141 return true; 5142 5143 MarkDeclarationReferenced(Loc, OperatorDelete); 5144 5145 Destructor->setOperatorDelete(OperatorDelete); 5146 } 5147 5148 return false; 5149} 5150 5151static inline bool 5152FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5153 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5154 FTI.ArgInfo[0].Param && 5155 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5156} 5157 5158/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5159/// the well-formednes of the destructor declarator @p D with type @p 5160/// R. If there are any errors in the declarator, this routine will 5161/// emit diagnostics and set the declarator to invalid. Even if this happens, 5162/// will be updated to reflect a well-formed type for the destructor and 5163/// returned. 5164QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5165 StorageClass& SC) { 5166 // C++ [class.dtor]p1: 5167 // [...] A typedef-name that names a class is a class-name 5168 // (7.1.3); however, a typedef-name that names a class shall not 5169 // be used as the identifier in the declarator for a destructor 5170 // declaration. 5171 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5172 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5173 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5174 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5175 else if (const TemplateSpecializationType *TST = 5176 DeclaratorType->getAs<TemplateSpecializationType>()) 5177 if (TST->isTypeAlias()) 5178 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5179 << DeclaratorType << 1; 5180 5181 // C++ [class.dtor]p2: 5182 // A destructor is used to destroy objects of its class type. A 5183 // destructor takes no parameters, and no return type can be 5184 // specified for it (not even void). The address of a destructor 5185 // shall not be taken. A destructor shall not be static. A 5186 // destructor can be invoked for a const, volatile or const 5187 // volatile object. A destructor shall not be declared const, 5188 // volatile or const volatile (9.3.2). 5189 if (SC == SC_Static) { 5190 if (!D.isInvalidType()) 5191 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5192 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5193 << SourceRange(D.getIdentifierLoc()) 5194 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5195 5196 SC = SC_None; 5197 } 5198 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5199 // Destructors don't have return types, but the parser will 5200 // happily parse something like: 5201 // 5202 // class X { 5203 // float ~X(); 5204 // }; 5205 // 5206 // The return type will be eliminated later. 5207 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5208 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5209 << SourceRange(D.getIdentifierLoc()); 5210 } 5211 5212 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5213 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5214 if (FTI.TypeQuals & Qualifiers::Const) 5215 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5216 << "const" << SourceRange(D.getIdentifierLoc()); 5217 if (FTI.TypeQuals & Qualifiers::Volatile) 5218 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5219 << "volatile" << SourceRange(D.getIdentifierLoc()); 5220 if (FTI.TypeQuals & Qualifiers::Restrict) 5221 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5222 << "restrict" << SourceRange(D.getIdentifierLoc()); 5223 D.setInvalidType(); 5224 } 5225 5226 // C++0x [class.dtor]p2: 5227 // A destructor shall not be declared with a ref-qualifier. 5228 if (FTI.hasRefQualifier()) { 5229 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5230 << FTI.RefQualifierIsLValueRef 5231 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5232 D.setInvalidType(); 5233 } 5234 5235 // Make sure we don't have any parameters. 5236 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5237 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5238 5239 // Delete the parameters. 5240 FTI.freeArgs(); 5241 D.setInvalidType(); 5242 } 5243 5244 // Make sure the destructor isn't variadic. 5245 if (FTI.isVariadic) { 5246 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5247 D.setInvalidType(); 5248 } 5249 5250 // Rebuild the function type "R" without any type qualifiers or 5251 // parameters (in case any of the errors above fired) and with 5252 // "void" as the return type, since destructors don't have return 5253 // types. 5254 if (!D.isInvalidType()) 5255 return R; 5256 5257 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5258 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5259 EPI.Variadic = false; 5260 EPI.TypeQuals = 0; 5261 EPI.RefQualifier = RQ_None; 5262 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5263} 5264 5265/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5266/// well-formednes of the conversion function declarator @p D with 5267/// type @p R. If there are any errors in the declarator, this routine 5268/// will emit diagnostics and return true. Otherwise, it will return 5269/// false. Either way, the type @p R will be updated to reflect a 5270/// well-formed type for the conversion operator. 5271void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5272 StorageClass& SC) { 5273 // C++ [class.conv.fct]p1: 5274 // Neither parameter types nor return type can be specified. The 5275 // type of a conversion function (8.3.5) is "function taking no 5276 // parameter returning conversion-type-id." 5277 if (SC == SC_Static) { 5278 if (!D.isInvalidType()) 5279 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5280 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5281 << SourceRange(D.getIdentifierLoc()); 5282 D.setInvalidType(); 5283 SC = SC_None; 5284 } 5285 5286 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5287 5288 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5289 // Conversion functions don't have return types, but the parser will 5290 // happily parse something like: 5291 // 5292 // class X { 5293 // float operator bool(); 5294 // }; 5295 // 5296 // The return type will be changed later anyway. 5297 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5298 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5299 << SourceRange(D.getIdentifierLoc()); 5300 D.setInvalidType(); 5301 } 5302 5303 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5304 5305 // Make sure we don't have any parameters. 5306 if (Proto->getNumArgs() > 0) { 5307 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5308 5309 // Delete the parameters. 5310 D.getFunctionTypeInfo().freeArgs(); 5311 D.setInvalidType(); 5312 } else if (Proto->isVariadic()) { 5313 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5314 D.setInvalidType(); 5315 } 5316 5317 // Diagnose "&operator bool()" and other such nonsense. This 5318 // is actually a gcc extension which we don't support. 5319 if (Proto->getResultType() != ConvType) { 5320 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5321 << Proto->getResultType(); 5322 D.setInvalidType(); 5323 ConvType = Proto->getResultType(); 5324 } 5325 5326 // C++ [class.conv.fct]p4: 5327 // The conversion-type-id shall not represent a function type nor 5328 // an array type. 5329 if (ConvType->isArrayType()) { 5330 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5331 ConvType = Context.getPointerType(ConvType); 5332 D.setInvalidType(); 5333 } else if (ConvType->isFunctionType()) { 5334 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5335 ConvType = Context.getPointerType(ConvType); 5336 D.setInvalidType(); 5337 } 5338 5339 // Rebuild the function type "R" without any parameters (in case any 5340 // of the errors above fired) and with the conversion type as the 5341 // return type. 5342 if (D.isInvalidType()) 5343 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5344 5345 // C++0x explicit conversion operators. 5346 if (D.getDeclSpec().isExplicitSpecified()) 5347 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5348 getLangOptions().CPlusPlus0x ? 5349 diag::warn_cxx98_compat_explicit_conversion_functions : 5350 diag::ext_explicit_conversion_functions) 5351 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5352} 5353 5354/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5355/// the declaration of the given C++ conversion function. This routine 5356/// is responsible for recording the conversion function in the C++ 5357/// class, if possible. 5358Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5359 assert(Conversion && "Expected to receive a conversion function declaration"); 5360 5361 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5362 5363 // Make sure we aren't redeclaring the conversion function. 5364 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5365 5366 // C++ [class.conv.fct]p1: 5367 // [...] A conversion function is never used to convert a 5368 // (possibly cv-qualified) object to the (possibly cv-qualified) 5369 // same object type (or a reference to it), to a (possibly 5370 // cv-qualified) base class of that type (or a reference to it), 5371 // or to (possibly cv-qualified) void. 5372 // FIXME: Suppress this warning if the conversion function ends up being a 5373 // virtual function that overrides a virtual function in a base class. 5374 QualType ClassType 5375 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5376 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5377 ConvType = ConvTypeRef->getPointeeType(); 5378 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5379 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5380 /* Suppress diagnostics for instantiations. */; 5381 else if (ConvType->isRecordType()) { 5382 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5383 if (ConvType == ClassType) 5384 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5385 << ClassType; 5386 else if (IsDerivedFrom(ClassType, ConvType)) 5387 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5388 << ClassType << ConvType; 5389 } else if (ConvType->isVoidType()) { 5390 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5391 << ClassType << ConvType; 5392 } 5393 5394 if (FunctionTemplateDecl *ConversionTemplate 5395 = Conversion->getDescribedFunctionTemplate()) 5396 return ConversionTemplate; 5397 5398 return Conversion; 5399} 5400 5401//===----------------------------------------------------------------------===// 5402// Namespace Handling 5403//===----------------------------------------------------------------------===// 5404 5405 5406 5407/// ActOnStartNamespaceDef - This is called at the start of a namespace 5408/// definition. 5409Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5410 SourceLocation InlineLoc, 5411 SourceLocation NamespaceLoc, 5412 SourceLocation IdentLoc, 5413 IdentifierInfo *II, 5414 SourceLocation LBrace, 5415 AttributeList *AttrList) { 5416 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5417 // For anonymous namespace, take the location of the left brace. 5418 SourceLocation Loc = II ? IdentLoc : LBrace; 5419 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5420 StartLoc, Loc, II); 5421 Namespc->setInline(InlineLoc.isValid()); 5422 5423 Scope *DeclRegionScope = NamespcScope->getParent(); 5424 5425 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5426 5427 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5428 PushNamespaceVisibilityAttr(Attr); 5429 5430 if (II) { 5431 // C++ [namespace.def]p2: 5432 // The identifier in an original-namespace-definition shall not 5433 // have been previously defined in the declarative region in 5434 // which the original-namespace-definition appears. The 5435 // identifier in an original-namespace-definition is the name of 5436 // the namespace. Subsequently in that declarative region, it is 5437 // treated as an original-namespace-name. 5438 // 5439 // Since namespace names are unique in their scope, and we don't 5440 // look through using directives, just look for any ordinary names. 5441 5442 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5443 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5444 Decl::IDNS_Namespace; 5445 NamedDecl *PrevDecl = 0; 5446 for (DeclContext::lookup_result R 5447 = CurContext->getRedeclContext()->lookup(II); 5448 R.first != R.second; ++R.first) { 5449 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5450 PrevDecl = *R.first; 5451 break; 5452 } 5453 } 5454 5455 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5456 // This is an extended namespace definition. 5457 if (Namespc->isInline() != OrigNS->isInline()) { 5458 // inline-ness must match 5459 if (OrigNS->isInline()) { 5460 // The user probably just forgot the 'inline', so suggest that it 5461 // be added back. 5462 Diag(Namespc->getLocation(), 5463 diag::warn_inline_namespace_reopened_noninline) 5464 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5465 } else { 5466 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5467 << Namespc->isInline(); 5468 } 5469 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5470 5471 // Recover by ignoring the new namespace's inline status. 5472 Namespc->setInline(OrigNS->isInline()); 5473 } 5474 5475 // Attach this namespace decl to the chain of extended namespace 5476 // definitions. 5477 OrigNS->setNextNamespace(Namespc); 5478 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5479 5480 // Remove the previous declaration from the scope. 5481 if (DeclRegionScope->isDeclScope(OrigNS)) { 5482 IdResolver.RemoveDecl(OrigNS); 5483 DeclRegionScope->RemoveDecl(OrigNS); 5484 } 5485 } else if (PrevDecl) { 5486 // This is an invalid name redefinition. 5487 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5488 << Namespc->getDeclName(); 5489 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5490 Namespc->setInvalidDecl(); 5491 // Continue on to push Namespc as current DeclContext and return it. 5492 } else if (II->isStr("std") && 5493 CurContext->getRedeclContext()->isTranslationUnit()) { 5494 // This is the first "real" definition of the namespace "std", so update 5495 // our cache of the "std" namespace to point at this definition. 5496 if (NamespaceDecl *StdNS = getStdNamespace()) { 5497 // We had already defined a dummy namespace "std". Link this new 5498 // namespace definition to the dummy namespace "std". 5499 StdNS->setNextNamespace(Namespc); 5500 StdNS->setLocation(IdentLoc); 5501 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5502 } 5503 5504 // Make our StdNamespace cache point at the first real definition of the 5505 // "std" namespace. 5506 StdNamespace = Namespc; 5507 5508 // Add this instance of "std" to the set of known namespaces 5509 KnownNamespaces[Namespc] = false; 5510 } else if (!Namespc->isInline()) { 5511 // Since this is an "original" namespace, add it to the known set of 5512 // namespaces if it is not an inline namespace. 5513 KnownNamespaces[Namespc] = false; 5514 } 5515 5516 PushOnScopeChains(Namespc, DeclRegionScope); 5517 } else { 5518 // Anonymous namespaces. 5519 assert(Namespc->isAnonymousNamespace()); 5520 5521 // Link the anonymous namespace into its parent. 5522 NamespaceDecl *PrevDecl; 5523 DeclContext *Parent = CurContext->getRedeclContext(); 5524 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5525 PrevDecl = TU->getAnonymousNamespace(); 5526 TU->setAnonymousNamespace(Namespc); 5527 } else { 5528 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5529 PrevDecl = ND->getAnonymousNamespace(); 5530 ND->setAnonymousNamespace(Namespc); 5531 } 5532 5533 // Link the anonymous namespace with its previous declaration. 5534 if (PrevDecl) { 5535 assert(PrevDecl->isAnonymousNamespace()); 5536 assert(!PrevDecl->getNextNamespace()); 5537 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5538 PrevDecl->setNextNamespace(Namespc); 5539 5540 if (Namespc->isInline() != PrevDecl->isInline()) { 5541 // inline-ness must match 5542 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5543 << Namespc->isInline(); 5544 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5545 Namespc->setInvalidDecl(); 5546 // Recover by ignoring the new namespace's inline status. 5547 Namespc->setInline(PrevDecl->isInline()); 5548 } 5549 } 5550 5551 CurContext->addDecl(Namespc); 5552 5553 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5554 // behaves as if it were replaced by 5555 // namespace unique { /* empty body */ } 5556 // using namespace unique; 5557 // namespace unique { namespace-body } 5558 // where all occurrences of 'unique' in a translation unit are 5559 // replaced by the same identifier and this identifier differs 5560 // from all other identifiers in the entire program. 5561 5562 // We just create the namespace with an empty name and then add an 5563 // implicit using declaration, just like the standard suggests. 5564 // 5565 // CodeGen enforces the "universally unique" aspect by giving all 5566 // declarations semantically contained within an anonymous 5567 // namespace internal linkage. 5568 5569 if (!PrevDecl) { 5570 UsingDirectiveDecl* UD 5571 = UsingDirectiveDecl::Create(Context, CurContext, 5572 /* 'using' */ LBrace, 5573 /* 'namespace' */ SourceLocation(), 5574 /* qualifier */ NestedNameSpecifierLoc(), 5575 /* identifier */ SourceLocation(), 5576 Namespc, 5577 /* Ancestor */ CurContext); 5578 UD->setImplicit(); 5579 CurContext->addDecl(UD); 5580 } 5581 } 5582 5583 // Although we could have an invalid decl (i.e. the namespace name is a 5584 // redefinition), push it as current DeclContext and try to continue parsing. 5585 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5586 // for the namespace has the declarations that showed up in that particular 5587 // namespace definition. 5588 PushDeclContext(NamespcScope, Namespc); 5589 return Namespc; 5590} 5591 5592/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5593/// is a namespace alias, returns the namespace it points to. 5594static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5595 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5596 return AD->getNamespace(); 5597 return dyn_cast_or_null<NamespaceDecl>(D); 5598} 5599 5600/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5601/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5602void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5603 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5604 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5605 Namespc->setRBraceLoc(RBrace); 5606 PopDeclContext(); 5607 if (Namespc->hasAttr<VisibilityAttr>()) 5608 PopPragmaVisibility(); 5609} 5610 5611CXXRecordDecl *Sema::getStdBadAlloc() const { 5612 return cast_or_null<CXXRecordDecl>( 5613 StdBadAlloc.get(Context.getExternalSource())); 5614} 5615 5616NamespaceDecl *Sema::getStdNamespace() const { 5617 return cast_or_null<NamespaceDecl>( 5618 StdNamespace.get(Context.getExternalSource())); 5619} 5620 5621/// \brief Retrieve the special "std" namespace, which may require us to 5622/// implicitly define the namespace. 5623NamespaceDecl *Sema::getOrCreateStdNamespace() { 5624 if (!StdNamespace) { 5625 // The "std" namespace has not yet been defined, so build one implicitly. 5626 StdNamespace = NamespaceDecl::Create(Context, 5627 Context.getTranslationUnitDecl(), 5628 SourceLocation(), SourceLocation(), 5629 &PP.getIdentifierTable().get("std")); 5630 getStdNamespace()->setImplicit(true); 5631 } 5632 5633 return getStdNamespace(); 5634} 5635 5636/// \brief Determine whether a using statement is in a context where it will be 5637/// apply in all contexts. 5638static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5639 switch (CurContext->getDeclKind()) { 5640 case Decl::TranslationUnit: 5641 return true; 5642 case Decl::LinkageSpec: 5643 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5644 default: 5645 return false; 5646 } 5647} 5648 5649static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5650 CXXScopeSpec &SS, 5651 SourceLocation IdentLoc, 5652 IdentifierInfo *Ident) { 5653 R.clear(); 5654 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5655 R.getLookupKind(), Sc, &SS, NULL, 5656 false, S.CTC_NoKeywords, NULL)) { 5657 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5658 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5659 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5660 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5661 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5662 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5663 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5664 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5665 else 5666 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5667 << Ident << CorrectedQuotedStr 5668 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5669 5670 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5671 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5672 5673 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5674 R.addDecl(Corrected.getCorrectionDecl()); 5675 return true; 5676 } 5677 R.setLookupName(Ident); 5678 } 5679 return false; 5680} 5681 5682Decl *Sema::ActOnUsingDirective(Scope *S, 5683 SourceLocation UsingLoc, 5684 SourceLocation NamespcLoc, 5685 CXXScopeSpec &SS, 5686 SourceLocation IdentLoc, 5687 IdentifierInfo *NamespcName, 5688 AttributeList *AttrList) { 5689 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5690 assert(NamespcName && "Invalid NamespcName."); 5691 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5692 5693 // This can only happen along a recovery path. 5694 while (S->getFlags() & Scope::TemplateParamScope) 5695 S = S->getParent(); 5696 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5697 5698 UsingDirectiveDecl *UDir = 0; 5699 NestedNameSpecifier *Qualifier = 0; 5700 if (SS.isSet()) 5701 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5702 5703 // Lookup namespace name. 5704 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5705 LookupParsedName(R, S, &SS); 5706 if (R.isAmbiguous()) 5707 return 0; 5708 5709 if (R.empty()) { 5710 R.clear(); 5711 // Allow "using namespace std;" or "using namespace ::std;" even if 5712 // "std" hasn't been defined yet, for GCC compatibility. 5713 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5714 NamespcName->isStr("std")) { 5715 Diag(IdentLoc, diag::ext_using_undefined_std); 5716 R.addDecl(getOrCreateStdNamespace()); 5717 R.resolveKind(); 5718 } 5719 // Otherwise, attempt typo correction. 5720 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5721 } 5722 5723 if (!R.empty()) { 5724 NamedDecl *Named = R.getFoundDecl(); 5725 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5726 && "expected namespace decl"); 5727 // C++ [namespace.udir]p1: 5728 // A using-directive specifies that the names in the nominated 5729 // namespace can be used in the scope in which the 5730 // using-directive appears after the using-directive. During 5731 // unqualified name lookup (3.4.1), the names appear as if they 5732 // were declared in the nearest enclosing namespace which 5733 // contains both the using-directive and the nominated 5734 // namespace. [Note: in this context, "contains" means "contains 5735 // directly or indirectly". ] 5736 5737 // Find enclosing context containing both using-directive and 5738 // nominated namespace. 5739 NamespaceDecl *NS = getNamespaceDecl(Named); 5740 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5741 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5742 CommonAncestor = CommonAncestor->getParent(); 5743 5744 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5745 SS.getWithLocInContext(Context), 5746 IdentLoc, Named, CommonAncestor); 5747 5748 if (IsUsingDirectiveInToplevelContext(CurContext) && 5749 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5750 Diag(IdentLoc, diag::warn_using_directive_in_header); 5751 } 5752 5753 PushUsingDirective(S, UDir); 5754 } else { 5755 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5756 } 5757 5758 // FIXME: We ignore attributes for now. 5759 return UDir; 5760} 5761 5762void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5763 // If scope has associated entity, then using directive is at namespace 5764 // or translation unit scope. We add UsingDirectiveDecls, into 5765 // it's lookup structure. 5766 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5767 Ctx->addDecl(UDir); 5768 else 5769 // Otherwise it is block-sope. using-directives will affect lookup 5770 // only to the end of scope. 5771 S->PushUsingDirective(UDir); 5772} 5773 5774 5775Decl *Sema::ActOnUsingDeclaration(Scope *S, 5776 AccessSpecifier AS, 5777 bool HasUsingKeyword, 5778 SourceLocation UsingLoc, 5779 CXXScopeSpec &SS, 5780 UnqualifiedId &Name, 5781 AttributeList *AttrList, 5782 bool IsTypeName, 5783 SourceLocation TypenameLoc) { 5784 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5785 5786 switch (Name.getKind()) { 5787 case UnqualifiedId::IK_ImplicitSelfParam: 5788 case UnqualifiedId::IK_Identifier: 5789 case UnqualifiedId::IK_OperatorFunctionId: 5790 case UnqualifiedId::IK_LiteralOperatorId: 5791 case UnqualifiedId::IK_ConversionFunctionId: 5792 break; 5793 5794 case UnqualifiedId::IK_ConstructorName: 5795 case UnqualifiedId::IK_ConstructorTemplateId: 5796 // C++0x inherited constructors. 5797 Diag(Name.getSourceRange().getBegin(), 5798 getLangOptions().CPlusPlus0x ? 5799 diag::warn_cxx98_compat_using_decl_constructor : 5800 diag::err_using_decl_constructor) 5801 << SS.getRange(); 5802 5803 if (getLangOptions().CPlusPlus0x) break; 5804 5805 return 0; 5806 5807 case UnqualifiedId::IK_DestructorName: 5808 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5809 << SS.getRange(); 5810 return 0; 5811 5812 case UnqualifiedId::IK_TemplateId: 5813 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5814 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5815 return 0; 5816 } 5817 5818 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5819 DeclarationName TargetName = TargetNameInfo.getName(); 5820 if (!TargetName) 5821 return 0; 5822 5823 // Warn about using declarations. 5824 // TODO: store that the declaration was written without 'using' and 5825 // talk about access decls instead of using decls in the 5826 // diagnostics. 5827 if (!HasUsingKeyword) { 5828 UsingLoc = Name.getSourceRange().getBegin(); 5829 5830 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5831 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5832 } 5833 5834 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5835 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5836 return 0; 5837 5838 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5839 TargetNameInfo, AttrList, 5840 /* IsInstantiation */ false, 5841 IsTypeName, TypenameLoc); 5842 if (UD) 5843 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5844 5845 return UD; 5846} 5847 5848/// \brief Determine whether a using declaration considers the given 5849/// declarations as "equivalent", e.g., if they are redeclarations of 5850/// the same entity or are both typedefs of the same type. 5851static bool 5852IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5853 bool &SuppressRedeclaration) { 5854 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5855 SuppressRedeclaration = false; 5856 return true; 5857 } 5858 5859 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5860 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5861 SuppressRedeclaration = true; 5862 return Context.hasSameType(TD1->getUnderlyingType(), 5863 TD2->getUnderlyingType()); 5864 } 5865 5866 return false; 5867} 5868 5869 5870/// Determines whether to create a using shadow decl for a particular 5871/// decl, given the set of decls existing prior to this using lookup. 5872bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5873 const LookupResult &Previous) { 5874 // Diagnose finding a decl which is not from a base class of the 5875 // current class. We do this now because there are cases where this 5876 // function will silently decide not to build a shadow decl, which 5877 // will pre-empt further diagnostics. 5878 // 5879 // We don't need to do this in C++0x because we do the check once on 5880 // the qualifier. 5881 // 5882 // FIXME: diagnose the following if we care enough: 5883 // struct A { int foo; }; 5884 // struct B : A { using A::foo; }; 5885 // template <class T> struct C : A {}; 5886 // template <class T> struct D : C<T> { using B::foo; } // <--- 5887 // This is invalid (during instantiation) in C++03 because B::foo 5888 // resolves to the using decl in B, which is not a base class of D<T>. 5889 // We can't diagnose it immediately because C<T> is an unknown 5890 // specialization. The UsingShadowDecl in D<T> then points directly 5891 // to A::foo, which will look well-formed when we instantiate. 5892 // The right solution is to not collapse the shadow-decl chain. 5893 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5894 DeclContext *OrigDC = Orig->getDeclContext(); 5895 5896 // Handle enums and anonymous structs. 5897 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5898 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5899 while (OrigRec->isAnonymousStructOrUnion()) 5900 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5901 5902 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5903 if (OrigDC == CurContext) { 5904 Diag(Using->getLocation(), 5905 diag::err_using_decl_nested_name_specifier_is_current_class) 5906 << Using->getQualifierLoc().getSourceRange(); 5907 Diag(Orig->getLocation(), diag::note_using_decl_target); 5908 return true; 5909 } 5910 5911 Diag(Using->getQualifierLoc().getBeginLoc(), 5912 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5913 << Using->getQualifier() 5914 << cast<CXXRecordDecl>(CurContext) 5915 << Using->getQualifierLoc().getSourceRange(); 5916 Diag(Orig->getLocation(), diag::note_using_decl_target); 5917 return true; 5918 } 5919 } 5920 5921 if (Previous.empty()) return false; 5922 5923 NamedDecl *Target = Orig; 5924 if (isa<UsingShadowDecl>(Target)) 5925 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5926 5927 // If the target happens to be one of the previous declarations, we 5928 // don't have a conflict. 5929 // 5930 // FIXME: but we might be increasing its access, in which case we 5931 // should redeclare it. 5932 NamedDecl *NonTag = 0, *Tag = 0; 5933 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5934 I != E; ++I) { 5935 NamedDecl *D = (*I)->getUnderlyingDecl(); 5936 bool Result; 5937 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5938 return Result; 5939 5940 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5941 } 5942 5943 if (Target->isFunctionOrFunctionTemplate()) { 5944 FunctionDecl *FD; 5945 if (isa<FunctionTemplateDecl>(Target)) 5946 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5947 else 5948 FD = cast<FunctionDecl>(Target); 5949 5950 NamedDecl *OldDecl = 0; 5951 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5952 case Ovl_Overload: 5953 return false; 5954 5955 case Ovl_NonFunction: 5956 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5957 break; 5958 5959 // We found a decl with the exact signature. 5960 case Ovl_Match: 5961 // If we're in a record, we want to hide the target, so we 5962 // return true (without a diagnostic) to tell the caller not to 5963 // build a shadow decl. 5964 if (CurContext->isRecord()) 5965 return true; 5966 5967 // If we're not in a record, this is an error. 5968 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5969 break; 5970 } 5971 5972 Diag(Target->getLocation(), diag::note_using_decl_target); 5973 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5974 return true; 5975 } 5976 5977 // Target is not a function. 5978 5979 if (isa<TagDecl>(Target)) { 5980 // No conflict between a tag and a non-tag. 5981 if (!Tag) return false; 5982 5983 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5984 Diag(Target->getLocation(), diag::note_using_decl_target); 5985 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5986 return true; 5987 } 5988 5989 // No conflict between a tag and a non-tag. 5990 if (!NonTag) return false; 5991 5992 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5993 Diag(Target->getLocation(), diag::note_using_decl_target); 5994 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5995 return true; 5996} 5997 5998/// Builds a shadow declaration corresponding to a 'using' declaration. 5999UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6000 UsingDecl *UD, 6001 NamedDecl *Orig) { 6002 6003 // If we resolved to another shadow declaration, just coalesce them. 6004 NamedDecl *Target = Orig; 6005 if (isa<UsingShadowDecl>(Target)) { 6006 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6007 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6008 } 6009 6010 UsingShadowDecl *Shadow 6011 = UsingShadowDecl::Create(Context, CurContext, 6012 UD->getLocation(), UD, Target); 6013 UD->addShadowDecl(Shadow); 6014 6015 Shadow->setAccess(UD->getAccess()); 6016 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6017 Shadow->setInvalidDecl(); 6018 6019 if (S) 6020 PushOnScopeChains(Shadow, S); 6021 else 6022 CurContext->addDecl(Shadow); 6023 6024 6025 return Shadow; 6026} 6027 6028/// Hides a using shadow declaration. This is required by the current 6029/// using-decl implementation when a resolvable using declaration in a 6030/// class is followed by a declaration which would hide or override 6031/// one or more of the using decl's targets; for example: 6032/// 6033/// struct Base { void foo(int); }; 6034/// struct Derived : Base { 6035/// using Base::foo; 6036/// void foo(int); 6037/// }; 6038/// 6039/// The governing language is C++03 [namespace.udecl]p12: 6040/// 6041/// When a using-declaration brings names from a base class into a 6042/// derived class scope, member functions in the derived class 6043/// override and/or hide member functions with the same name and 6044/// parameter types in a base class (rather than conflicting). 6045/// 6046/// There are two ways to implement this: 6047/// (1) optimistically create shadow decls when they're not hidden 6048/// by existing declarations, or 6049/// (2) don't create any shadow decls (or at least don't make them 6050/// visible) until we've fully parsed/instantiated the class. 6051/// The problem with (1) is that we might have to retroactively remove 6052/// a shadow decl, which requires several O(n) operations because the 6053/// decl structures are (very reasonably) not designed for removal. 6054/// (2) avoids this but is very fiddly and phase-dependent. 6055void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6056 if (Shadow->getDeclName().getNameKind() == 6057 DeclarationName::CXXConversionFunctionName) 6058 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6059 6060 // Remove it from the DeclContext... 6061 Shadow->getDeclContext()->removeDecl(Shadow); 6062 6063 // ...and the scope, if applicable... 6064 if (S) { 6065 S->RemoveDecl(Shadow); 6066 IdResolver.RemoveDecl(Shadow); 6067 } 6068 6069 // ...and the using decl. 6070 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6071 6072 // TODO: complain somehow if Shadow was used. It shouldn't 6073 // be possible for this to happen, because...? 6074} 6075 6076/// Builds a using declaration. 6077/// 6078/// \param IsInstantiation - Whether this call arises from an 6079/// instantiation of an unresolved using declaration. We treat 6080/// the lookup differently for these declarations. 6081NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6082 SourceLocation UsingLoc, 6083 CXXScopeSpec &SS, 6084 const DeclarationNameInfo &NameInfo, 6085 AttributeList *AttrList, 6086 bool IsInstantiation, 6087 bool IsTypeName, 6088 SourceLocation TypenameLoc) { 6089 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6090 SourceLocation IdentLoc = NameInfo.getLoc(); 6091 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6092 6093 // FIXME: We ignore attributes for now. 6094 6095 if (SS.isEmpty()) { 6096 Diag(IdentLoc, diag::err_using_requires_qualname); 6097 return 0; 6098 } 6099 6100 // Do the redeclaration lookup in the current scope. 6101 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6102 ForRedeclaration); 6103 Previous.setHideTags(false); 6104 if (S) { 6105 LookupName(Previous, S); 6106 6107 // It is really dumb that we have to do this. 6108 LookupResult::Filter F = Previous.makeFilter(); 6109 while (F.hasNext()) { 6110 NamedDecl *D = F.next(); 6111 if (!isDeclInScope(D, CurContext, S)) 6112 F.erase(); 6113 } 6114 F.done(); 6115 } else { 6116 assert(IsInstantiation && "no scope in non-instantiation"); 6117 assert(CurContext->isRecord() && "scope not record in instantiation"); 6118 LookupQualifiedName(Previous, CurContext); 6119 } 6120 6121 // Check for invalid redeclarations. 6122 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6123 return 0; 6124 6125 // Check for bad qualifiers. 6126 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6127 return 0; 6128 6129 DeclContext *LookupContext = computeDeclContext(SS); 6130 NamedDecl *D; 6131 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6132 if (!LookupContext) { 6133 if (IsTypeName) { 6134 // FIXME: not all declaration name kinds are legal here 6135 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6136 UsingLoc, TypenameLoc, 6137 QualifierLoc, 6138 IdentLoc, NameInfo.getName()); 6139 } else { 6140 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6141 QualifierLoc, NameInfo); 6142 } 6143 } else { 6144 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6145 NameInfo, IsTypeName); 6146 } 6147 D->setAccess(AS); 6148 CurContext->addDecl(D); 6149 6150 if (!LookupContext) return D; 6151 UsingDecl *UD = cast<UsingDecl>(D); 6152 6153 if (RequireCompleteDeclContext(SS, LookupContext)) { 6154 UD->setInvalidDecl(); 6155 return UD; 6156 } 6157 6158 // Constructor inheriting using decls get special treatment. 6159 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6160 if (CheckInheritedConstructorUsingDecl(UD)) 6161 UD->setInvalidDecl(); 6162 return UD; 6163 } 6164 6165 // Otherwise, look up the target name. 6166 6167 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6168 6169 // Unlike most lookups, we don't always want to hide tag 6170 // declarations: tag names are visible through the using declaration 6171 // even if hidden by ordinary names, *except* in a dependent context 6172 // where it's important for the sanity of two-phase lookup. 6173 if (!IsInstantiation) 6174 R.setHideTags(false); 6175 6176 LookupQualifiedName(R, LookupContext); 6177 6178 if (R.empty()) { 6179 Diag(IdentLoc, diag::err_no_member) 6180 << NameInfo.getName() << LookupContext << SS.getRange(); 6181 UD->setInvalidDecl(); 6182 return UD; 6183 } 6184 6185 if (R.isAmbiguous()) { 6186 UD->setInvalidDecl(); 6187 return UD; 6188 } 6189 6190 if (IsTypeName) { 6191 // If we asked for a typename and got a non-type decl, error out. 6192 if (!R.getAsSingle<TypeDecl>()) { 6193 Diag(IdentLoc, diag::err_using_typename_non_type); 6194 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6195 Diag((*I)->getUnderlyingDecl()->getLocation(), 6196 diag::note_using_decl_target); 6197 UD->setInvalidDecl(); 6198 return UD; 6199 } 6200 } else { 6201 // If we asked for a non-typename and we got a type, error out, 6202 // but only if this is an instantiation of an unresolved using 6203 // decl. Otherwise just silently find the type name. 6204 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6205 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6206 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6207 UD->setInvalidDecl(); 6208 return UD; 6209 } 6210 } 6211 6212 // C++0x N2914 [namespace.udecl]p6: 6213 // A using-declaration shall not name a namespace. 6214 if (R.getAsSingle<NamespaceDecl>()) { 6215 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6216 << SS.getRange(); 6217 UD->setInvalidDecl(); 6218 return UD; 6219 } 6220 6221 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6222 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6223 BuildUsingShadowDecl(S, UD, *I); 6224 } 6225 6226 return UD; 6227} 6228 6229/// Additional checks for a using declaration referring to a constructor name. 6230bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6231 if (UD->isTypeName()) { 6232 // FIXME: Cannot specify typename when specifying constructor 6233 return true; 6234 } 6235 6236 const Type *SourceType = UD->getQualifier()->getAsType(); 6237 assert(SourceType && 6238 "Using decl naming constructor doesn't have type in scope spec."); 6239 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6240 6241 // Check whether the named type is a direct base class. 6242 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6243 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6244 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6245 BaseIt != BaseE; ++BaseIt) { 6246 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6247 if (CanonicalSourceType == BaseType) 6248 break; 6249 } 6250 6251 if (BaseIt == BaseE) { 6252 // Did not find SourceType in the bases. 6253 Diag(UD->getUsingLocation(), 6254 diag::err_using_decl_constructor_not_in_direct_base) 6255 << UD->getNameInfo().getSourceRange() 6256 << QualType(SourceType, 0) << TargetClass; 6257 return true; 6258 } 6259 6260 BaseIt->setInheritConstructors(); 6261 6262 return false; 6263} 6264 6265/// Checks that the given using declaration is not an invalid 6266/// redeclaration. Note that this is checking only for the using decl 6267/// itself, not for any ill-formedness among the UsingShadowDecls. 6268bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6269 bool isTypeName, 6270 const CXXScopeSpec &SS, 6271 SourceLocation NameLoc, 6272 const LookupResult &Prev) { 6273 // C++03 [namespace.udecl]p8: 6274 // C++0x [namespace.udecl]p10: 6275 // A using-declaration is a declaration and can therefore be used 6276 // repeatedly where (and only where) multiple declarations are 6277 // allowed. 6278 // 6279 // That's in non-member contexts. 6280 if (!CurContext->getRedeclContext()->isRecord()) 6281 return false; 6282 6283 NestedNameSpecifier *Qual 6284 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6285 6286 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6287 NamedDecl *D = *I; 6288 6289 bool DTypename; 6290 NestedNameSpecifier *DQual; 6291 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6292 DTypename = UD->isTypeName(); 6293 DQual = UD->getQualifier(); 6294 } else if (UnresolvedUsingValueDecl *UD 6295 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6296 DTypename = false; 6297 DQual = UD->getQualifier(); 6298 } else if (UnresolvedUsingTypenameDecl *UD 6299 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6300 DTypename = true; 6301 DQual = UD->getQualifier(); 6302 } else continue; 6303 6304 // using decls differ if one says 'typename' and the other doesn't. 6305 // FIXME: non-dependent using decls? 6306 if (isTypeName != DTypename) continue; 6307 6308 // using decls differ if they name different scopes (but note that 6309 // template instantiation can cause this check to trigger when it 6310 // didn't before instantiation). 6311 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6312 Context.getCanonicalNestedNameSpecifier(DQual)) 6313 continue; 6314 6315 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6316 Diag(D->getLocation(), diag::note_using_decl) << 1; 6317 return true; 6318 } 6319 6320 return false; 6321} 6322 6323 6324/// Checks that the given nested-name qualifier used in a using decl 6325/// in the current context is appropriately related to the current 6326/// scope. If an error is found, diagnoses it and returns true. 6327bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6328 const CXXScopeSpec &SS, 6329 SourceLocation NameLoc) { 6330 DeclContext *NamedContext = computeDeclContext(SS); 6331 6332 if (!CurContext->isRecord()) { 6333 // C++03 [namespace.udecl]p3: 6334 // C++0x [namespace.udecl]p8: 6335 // A using-declaration for a class member shall be a member-declaration. 6336 6337 // If we weren't able to compute a valid scope, it must be a 6338 // dependent class scope. 6339 if (!NamedContext || NamedContext->isRecord()) { 6340 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6341 << SS.getRange(); 6342 return true; 6343 } 6344 6345 // Otherwise, everything is known to be fine. 6346 return false; 6347 } 6348 6349 // The current scope is a record. 6350 6351 // If the named context is dependent, we can't decide much. 6352 if (!NamedContext) { 6353 // FIXME: in C++0x, we can diagnose if we can prove that the 6354 // nested-name-specifier does not refer to a base class, which is 6355 // still possible in some cases. 6356 6357 // Otherwise we have to conservatively report that things might be 6358 // okay. 6359 return false; 6360 } 6361 6362 if (!NamedContext->isRecord()) { 6363 // Ideally this would point at the last name in the specifier, 6364 // but we don't have that level of source info. 6365 Diag(SS.getRange().getBegin(), 6366 diag::err_using_decl_nested_name_specifier_is_not_class) 6367 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6368 return true; 6369 } 6370 6371 if (!NamedContext->isDependentContext() && 6372 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6373 return true; 6374 6375 if (getLangOptions().CPlusPlus0x) { 6376 // C++0x [namespace.udecl]p3: 6377 // In a using-declaration used as a member-declaration, the 6378 // nested-name-specifier shall name a base class of the class 6379 // being defined. 6380 6381 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6382 cast<CXXRecordDecl>(NamedContext))) { 6383 if (CurContext == NamedContext) { 6384 Diag(NameLoc, 6385 diag::err_using_decl_nested_name_specifier_is_current_class) 6386 << SS.getRange(); 6387 return true; 6388 } 6389 6390 Diag(SS.getRange().getBegin(), 6391 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6392 << (NestedNameSpecifier*) SS.getScopeRep() 6393 << cast<CXXRecordDecl>(CurContext) 6394 << SS.getRange(); 6395 return true; 6396 } 6397 6398 return false; 6399 } 6400 6401 // C++03 [namespace.udecl]p4: 6402 // A using-declaration used as a member-declaration shall refer 6403 // to a member of a base class of the class being defined [etc.]. 6404 6405 // Salient point: SS doesn't have to name a base class as long as 6406 // lookup only finds members from base classes. Therefore we can 6407 // diagnose here only if we can prove that that can't happen, 6408 // i.e. if the class hierarchies provably don't intersect. 6409 6410 // TODO: it would be nice if "definitely valid" results were cached 6411 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6412 // need to be repeated. 6413 6414 struct UserData { 6415 llvm::DenseSet<const CXXRecordDecl*> Bases; 6416 6417 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6418 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6419 Data->Bases.insert(Base); 6420 return true; 6421 } 6422 6423 bool hasDependentBases(const CXXRecordDecl *Class) { 6424 return !Class->forallBases(collect, this); 6425 } 6426 6427 /// Returns true if the base is dependent or is one of the 6428 /// accumulated base classes. 6429 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6430 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6431 return !Data->Bases.count(Base); 6432 } 6433 6434 bool mightShareBases(const CXXRecordDecl *Class) { 6435 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6436 } 6437 }; 6438 6439 UserData Data; 6440 6441 // Returns false if we find a dependent base. 6442 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6443 return false; 6444 6445 // Returns false if the class has a dependent base or if it or one 6446 // of its bases is present in the base set of the current context. 6447 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6448 return false; 6449 6450 Diag(SS.getRange().getBegin(), 6451 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6452 << (NestedNameSpecifier*) SS.getScopeRep() 6453 << cast<CXXRecordDecl>(CurContext) 6454 << SS.getRange(); 6455 6456 return true; 6457} 6458 6459Decl *Sema::ActOnAliasDeclaration(Scope *S, 6460 AccessSpecifier AS, 6461 MultiTemplateParamsArg TemplateParamLists, 6462 SourceLocation UsingLoc, 6463 UnqualifiedId &Name, 6464 TypeResult Type) { 6465 // Skip up to the relevant declaration scope. 6466 while (S->getFlags() & Scope::TemplateParamScope) 6467 S = S->getParent(); 6468 assert((S->getFlags() & Scope::DeclScope) && 6469 "got alias-declaration outside of declaration scope"); 6470 6471 if (Type.isInvalid()) 6472 return 0; 6473 6474 bool Invalid = false; 6475 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6476 TypeSourceInfo *TInfo = 0; 6477 GetTypeFromParser(Type.get(), &TInfo); 6478 6479 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6480 return 0; 6481 6482 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6483 UPPC_DeclarationType)) { 6484 Invalid = true; 6485 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6486 TInfo->getTypeLoc().getBeginLoc()); 6487 } 6488 6489 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6490 LookupName(Previous, S); 6491 6492 // Warn about shadowing the name of a template parameter. 6493 if (Previous.isSingleResult() && 6494 Previous.getFoundDecl()->isTemplateParameter()) { 6495 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6496 Previous.clear(); 6497 } 6498 6499 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6500 "name in alias declaration must be an identifier"); 6501 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6502 Name.StartLocation, 6503 Name.Identifier, TInfo); 6504 6505 NewTD->setAccess(AS); 6506 6507 if (Invalid) 6508 NewTD->setInvalidDecl(); 6509 6510 CheckTypedefForVariablyModifiedType(S, NewTD); 6511 Invalid |= NewTD->isInvalidDecl(); 6512 6513 bool Redeclaration = false; 6514 6515 NamedDecl *NewND; 6516 if (TemplateParamLists.size()) { 6517 TypeAliasTemplateDecl *OldDecl = 0; 6518 TemplateParameterList *OldTemplateParams = 0; 6519 6520 if (TemplateParamLists.size() != 1) { 6521 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6522 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6523 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6524 } 6525 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6526 6527 // Only consider previous declarations in the same scope. 6528 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6529 /*ExplicitInstantiationOrSpecialization*/false); 6530 if (!Previous.empty()) { 6531 Redeclaration = true; 6532 6533 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6534 if (!OldDecl && !Invalid) { 6535 Diag(UsingLoc, diag::err_redefinition_different_kind) 6536 << Name.Identifier; 6537 6538 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6539 if (OldD->getLocation().isValid()) 6540 Diag(OldD->getLocation(), diag::note_previous_definition); 6541 6542 Invalid = true; 6543 } 6544 6545 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6546 if (TemplateParameterListsAreEqual(TemplateParams, 6547 OldDecl->getTemplateParameters(), 6548 /*Complain=*/true, 6549 TPL_TemplateMatch)) 6550 OldTemplateParams = OldDecl->getTemplateParameters(); 6551 else 6552 Invalid = true; 6553 6554 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6555 if (!Invalid && 6556 !Context.hasSameType(OldTD->getUnderlyingType(), 6557 NewTD->getUnderlyingType())) { 6558 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6559 // but we can't reasonably accept it. 6560 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6561 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6562 if (OldTD->getLocation().isValid()) 6563 Diag(OldTD->getLocation(), diag::note_previous_definition); 6564 Invalid = true; 6565 } 6566 } 6567 } 6568 6569 // Merge any previous default template arguments into our parameters, 6570 // and check the parameter list. 6571 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6572 TPC_TypeAliasTemplate)) 6573 return 0; 6574 6575 TypeAliasTemplateDecl *NewDecl = 6576 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6577 Name.Identifier, TemplateParams, 6578 NewTD); 6579 6580 NewDecl->setAccess(AS); 6581 6582 if (Invalid) 6583 NewDecl->setInvalidDecl(); 6584 else if (OldDecl) 6585 NewDecl->setPreviousDeclaration(OldDecl); 6586 6587 NewND = NewDecl; 6588 } else { 6589 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6590 NewND = NewTD; 6591 } 6592 6593 if (!Redeclaration) 6594 PushOnScopeChains(NewND, S); 6595 6596 return NewND; 6597} 6598 6599Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6600 SourceLocation NamespaceLoc, 6601 SourceLocation AliasLoc, 6602 IdentifierInfo *Alias, 6603 CXXScopeSpec &SS, 6604 SourceLocation IdentLoc, 6605 IdentifierInfo *Ident) { 6606 6607 // Lookup the namespace name. 6608 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6609 LookupParsedName(R, S, &SS); 6610 6611 // Check if we have a previous declaration with the same name. 6612 NamedDecl *PrevDecl 6613 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6614 ForRedeclaration); 6615 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6616 PrevDecl = 0; 6617 6618 if (PrevDecl) { 6619 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6620 // We already have an alias with the same name that points to the same 6621 // namespace, so don't create a new one. 6622 // FIXME: At some point, we'll want to create the (redundant) 6623 // declaration to maintain better source information. 6624 if (!R.isAmbiguous() && !R.empty() && 6625 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6626 return 0; 6627 } 6628 6629 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6630 diag::err_redefinition_different_kind; 6631 Diag(AliasLoc, DiagID) << Alias; 6632 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6633 return 0; 6634 } 6635 6636 if (R.isAmbiguous()) 6637 return 0; 6638 6639 if (R.empty()) { 6640 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6641 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6642 return 0; 6643 } 6644 } 6645 6646 NamespaceAliasDecl *AliasDecl = 6647 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6648 Alias, SS.getWithLocInContext(Context), 6649 IdentLoc, R.getFoundDecl()); 6650 6651 PushOnScopeChains(AliasDecl, S); 6652 return AliasDecl; 6653} 6654 6655namespace { 6656 /// \brief Scoped object used to handle the state changes required in Sema 6657 /// to implicitly define the body of a C++ member function; 6658 class ImplicitlyDefinedFunctionScope { 6659 Sema &S; 6660 Sema::ContextRAII SavedContext; 6661 6662 public: 6663 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6664 : S(S), SavedContext(S, Method) 6665 { 6666 S.PushFunctionScope(); 6667 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6668 } 6669 6670 ~ImplicitlyDefinedFunctionScope() { 6671 S.PopExpressionEvaluationContext(); 6672 S.PopFunctionOrBlockScope(); 6673 } 6674 }; 6675} 6676 6677Sema::ImplicitExceptionSpecification 6678Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6679 // C++ [except.spec]p14: 6680 // An implicitly declared special member function (Clause 12) shall have an 6681 // exception-specification. [...] 6682 ImplicitExceptionSpecification ExceptSpec(Context); 6683 if (ClassDecl->isInvalidDecl()) 6684 return ExceptSpec; 6685 6686 // Direct base-class constructors. 6687 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6688 BEnd = ClassDecl->bases_end(); 6689 B != BEnd; ++B) { 6690 if (B->isVirtual()) // Handled below. 6691 continue; 6692 6693 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6694 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6695 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6696 // If this is a deleted function, add it anyway. This might be conformant 6697 // with the standard. This might not. I'm not sure. It might not matter. 6698 if (Constructor) 6699 ExceptSpec.CalledDecl(Constructor); 6700 } 6701 } 6702 6703 // Virtual base-class constructors. 6704 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6705 BEnd = ClassDecl->vbases_end(); 6706 B != BEnd; ++B) { 6707 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6708 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6709 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6710 // If this is a deleted function, add it anyway. This might be conformant 6711 // with the standard. This might not. I'm not sure. It might not matter. 6712 if (Constructor) 6713 ExceptSpec.CalledDecl(Constructor); 6714 } 6715 } 6716 6717 // Field constructors. 6718 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6719 FEnd = ClassDecl->field_end(); 6720 F != FEnd; ++F) { 6721 if (F->hasInClassInitializer()) { 6722 if (Expr *E = F->getInClassInitializer()) 6723 ExceptSpec.CalledExpr(E); 6724 else if (!F->isInvalidDecl()) 6725 ExceptSpec.SetDelayed(); 6726 } else if (const RecordType *RecordTy 6727 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6728 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6729 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6730 // If this is a deleted function, add it anyway. This might be conformant 6731 // with the standard. This might not. I'm not sure. It might not matter. 6732 // In particular, the problem is that this function never gets called. It 6733 // might just be ill-formed because this function attempts to refer to 6734 // a deleted function here. 6735 if (Constructor) 6736 ExceptSpec.CalledDecl(Constructor); 6737 } 6738 } 6739 6740 return ExceptSpec; 6741} 6742 6743CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6744 CXXRecordDecl *ClassDecl) { 6745 // C++ [class.ctor]p5: 6746 // A default constructor for a class X is a constructor of class X 6747 // that can be called without an argument. If there is no 6748 // user-declared constructor for class X, a default constructor is 6749 // implicitly declared. An implicitly-declared default constructor 6750 // is an inline public member of its class. 6751 assert(!ClassDecl->hasUserDeclaredConstructor() && 6752 "Should not build implicit default constructor!"); 6753 6754 ImplicitExceptionSpecification Spec = 6755 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6756 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6757 6758 // Create the actual constructor declaration. 6759 CanQualType ClassType 6760 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6761 SourceLocation ClassLoc = ClassDecl->getLocation(); 6762 DeclarationName Name 6763 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6764 DeclarationNameInfo NameInfo(Name, ClassLoc); 6765 CXXConstructorDecl *DefaultCon 6766 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6767 Context.getFunctionType(Context.VoidTy, 6768 0, 0, EPI), 6769 /*TInfo=*/0, 6770 /*isExplicit=*/false, 6771 /*isInline=*/true, 6772 /*isImplicitlyDeclared=*/true, 6773 // FIXME: apply the rules for definitions here 6774 /*isConstexpr=*/false); 6775 DefaultCon->setAccess(AS_public); 6776 DefaultCon->setDefaulted(); 6777 DefaultCon->setImplicit(); 6778 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6779 6780 // Note that we have declared this constructor. 6781 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6782 6783 if (Scope *S = getScopeForContext(ClassDecl)) 6784 PushOnScopeChains(DefaultCon, S, false); 6785 ClassDecl->addDecl(DefaultCon); 6786 6787 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6788 DefaultCon->setDeletedAsWritten(); 6789 6790 return DefaultCon; 6791} 6792 6793void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6794 CXXConstructorDecl *Constructor) { 6795 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6796 !Constructor->doesThisDeclarationHaveABody() && 6797 !Constructor->isDeleted()) && 6798 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6799 6800 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6801 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6802 6803 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6804 DiagnosticErrorTrap Trap(Diags); 6805 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6806 Trap.hasErrorOccurred()) { 6807 Diag(CurrentLocation, diag::note_member_synthesized_at) 6808 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6809 Constructor->setInvalidDecl(); 6810 return; 6811 } 6812 6813 SourceLocation Loc = Constructor->getLocation(); 6814 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6815 6816 Constructor->setUsed(); 6817 MarkVTableUsed(CurrentLocation, ClassDecl); 6818 6819 if (ASTMutationListener *L = getASTMutationListener()) { 6820 L->CompletedImplicitDefinition(Constructor); 6821 } 6822} 6823 6824/// Get any existing defaulted default constructor for the given class. Do not 6825/// implicitly define one if it does not exist. 6826static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6827 CXXRecordDecl *D) { 6828 ASTContext &Context = Self.Context; 6829 QualType ClassType = Context.getTypeDeclType(D); 6830 DeclarationName ConstructorName 6831 = Context.DeclarationNames.getCXXConstructorName( 6832 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6833 6834 DeclContext::lookup_const_iterator Con, ConEnd; 6835 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6836 Con != ConEnd; ++Con) { 6837 // A function template cannot be defaulted. 6838 if (isa<FunctionTemplateDecl>(*Con)) 6839 continue; 6840 6841 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6842 if (Constructor->isDefaultConstructor()) 6843 return Constructor->isDefaulted() ? Constructor : 0; 6844 } 6845 return 0; 6846} 6847 6848void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6849 if (!D) return; 6850 AdjustDeclIfTemplate(D); 6851 6852 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6853 CXXConstructorDecl *CtorDecl 6854 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6855 6856 if (!CtorDecl) return; 6857 6858 // Compute the exception specification for the default constructor. 6859 const FunctionProtoType *CtorTy = 6860 CtorDecl->getType()->castAs<FunctionProtoType>(); 6861 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6862 ImplicitExceptionSpecification Spec = 6863 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6864 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6865 assert(EPI.ExceptionSpecType != EST_Delayed); 6866 6867 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6868 } 6869 6870 // If the default constructor is explicitly defaulted, checking the exception 6871 // specification is deferred until now. 6872 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6873 !ClassDecl->isDependentType()) 6874 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6875} 6876 6877void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6878 // We start with an initial pass over the base classes to collect those that 6879 // inherit constructors from. If there are none, we can forgo all further 6880 // processing. 6881 typedef SmallVector<const RecordType *, 4> BasesVector; 6882 BasesVector BasesToInheritFrom; 6883 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6884 BaseE = ClassDecl->bases_end(); 6885 BaseIt != BaseE; ++BaseIt) { 6886 if (BaseIt->getInheritConstructors()) { 6887 QualType Base = BaseIt->getType(); 6888 if (Base->isDependentType()) { 6889 // If we inherit constructors from anything that is dependent, just 6890 // abort processing altogether. We'll get another chance for the 6891 // instantiations. 6892 return; 6893 } 6894 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6895 } 6896 } 6897 if (BasesToInheritFrom.empty()) 6898 return; 6899 6900 // Now collect the constructors that we already have in the current class. 6901 // Those take precedence over inherited constructors. 6902 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6903 // unless there is a user-declared constructor with the same signature in 6904 // the class where the using-declaration appears. 6905 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6906 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6907 CtorE = ClassDecl->ctor_end(); 6908 CtorIt != CtorE; ++CtorIt) { 6909 ExistingConstructors.insert( 6910 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6911 } 6912 6913 Scope *S = getScopeForContext(ClassDecl); 6914 DeclarationName CreatedCtorName = 6915 Context.DeclarationNames.getCXXConstructorName( 6916 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6917 6918 // Now comes the true work. 6919 // First, we keep a map from constructor types to the base that introduced 6920 // them. Needed for finding conflicting constructors. We also keep the 6921 // actually inserted declarations in there, for pretty diagnostics. 6922 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6923 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6924 ConstructorToSourceMap InheritedConstructors; 6925 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6926 BaseE = BasesToInheritFrom.end(); 6927 BaseIt != BaseE; ++BaseIt) { 6928 const RecordType *Base = *BaseIt; 6929 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6930 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6931 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6932 CtorE = BaseDecl->ctor_end(); 6933 CtorIt != CtorE; ++CtorIt) { 6934 // Find the using declaration for inheriting this base's constructors. 6935 DeclarationName Name = 6936 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6937 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6938 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6939 SourceLocation UsingLoc = UD ? UD->getLocation() : 6940 ClassDecl->getLocation(); 6941 6942 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6943 // from the class X named in the using-declaration consists of actual 6944 // constructors and notional constructors that result from the 6945 // transformation of defaulted parameters as follows: 6946 // - all non-template default constructors of X, and 6947 // - for each non-template constructor of X that has at least one 6948 // parameter with a default argument, the set of constructors that 6949 // results from omitting any ellipsis parameter specification and 6950 // successively omitting parameters with a default argument from the 6951 // end of the parameter-type-list. 6952 CXXConstructorDecl *BaseCtor = *CtorIt; 6953 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6954 const FunctionProtoType *BaseCtorType = 6955 BaseCtor->getType()->getAs<FunctionProtoType>(); 6956 6957 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6958 maxParams = BaseCtor->getNumParams(); 6959 params <= maxParams; ++params) { 6960 // Skip default constructors. They're never inherited. 6961 if (params == 0) 6962 continue; 6963 // Skip copy and move constructors for the same reason. 6964 if (CanBeCopyOrMove && params == 1) 6965 continue; 6966 6967 // Build up a function type for this particular constructor. 6968 // FIXME: The working paper does not consider that the exception spec 6969 // for the inheriting constructor might be larger than that of the 6970 // source. This code doesn't yet, either. When it does, this code will 6971 // need to be delayed until after exception specifications and in-class 6972 // member initializers are attached. 6973 const Type *NewCtorType; 6974 if (params == maxParams) 6975 NewCtorType = BaseCtorType; 6976 else { 6977 SmallVector<QualType, 16> Args; 6978 for (unsigned i = 0; i < params; ++i) { 6979 Args.push_back(BaseCtorType->getArgType(i)); 6980 } 6981 FunctionProtoType::ExtProtoInfo ExtInfo = 6982 BaseCtorType->getExtProtoInfo(); 6983 ExtInfo.Variadic = false; 6984 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6985 Args.data(), params, ExtInfo) 6986 .getTypePtr(); 6987 } 6988 const Type *CanonicalNewCtorType = 6989 Context.getCanonicalType(NewCtorType); 6990 6991 // Now that we have the type, first check if the class already has a 6992 // constructor with this signature. 6993 if (ExistingConstructors.count(CanonicalNewCtorType)) 6994 continue; 6995 6996 // Then we check if we have already declared an inherited constructor 6997 // with this signature. 6998 std::pair<ConstructorToSourceMap::iterator, bool> result = 6999 InheritedConstructors.insert(std::make_pair( 7000 CanonicalNewCtorType, 7001 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7002 if (!result.second) { 7003 // Already in the map. If it came from a different class, that's an 7004 // error. Not if it's from the same. 7005 CanQualType PreviousBase = result.first->second.first; 7006 if (CanonicalBase != PreviousBase) { 7007 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7008 const CXXConstructorDecl *PrevBaseCtor = 7009 PrevCtor->getInheritedConstructor(); 7010 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7011 7012 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7013 Diag(BaseCtor->getLocation(), 7014 diag::note_using_decl_constructor_conflict_current_ctor); 7015 Diag(PrevBaseCtor->getLocation(), 7016 diag::note_using_decl_constructor_conflict_previous_ctor); 7017 Diag(PrevCtor->getLocation(), 7018 diag::note_using_decl_constructor_conflict_previous_using); 7019 } 7020 continue; 7021 } 7022 7023 // OK, we're there, now add the constructor. 7024 // C++0x [class.inhctor]p8: [...] that would be performed by a 7025 // user-written inline constructor [...] 7026 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7027 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7028 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7029 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7030 /*ImplicitlyDeclared=*/true, 7031 // FIXME: Due to a defect in the standard, we treat inherited 7032 // constructors as constexpr even if that makes them ill-formed. 7033 /*Constexpr=*/BaseCtor->isConstexpr()); 7034 NewCtor->setAccess(BaseCtor->getAccess()); 7035 7036 // Build up the parameter decls and add them. 7037 SmallVector<ParmVarDecl *, 16> ParamDecls; 7038 for (unsigned i = 0; i < params; ++i) { 7039 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7040 UsingLoc, UsingLoc, 7041 /*IdentifierInfo=*/0, 7042 BaseCtorType->getArgType(i), 7043 /*TInfo=*/0, SC_None, 7044 SC_None, /*DefaultArg=*/0)); 7045 } 7046 NewCtor->setParams(ParamDecls); 7047 NewCtor->setInheritedConstructor(BaseCtor); 7048 7049 PushOnScopeChains(NewCtor, S, false); 7050 ClassDecl->addDecl(NewCtor); 7051 result.first->second.second = NewCtor; 7052 } 7053 } 7054 } 7055} 7056 7057Sema::ImplicitExceptionSpecification 7058Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7059 // C++ [except.spec]p14: 7060 // An implicitly declared special member function (Clause 12) shall have 7061 // an exception-specification. 7062 ImplicitExceptionSpecification ExceptSpec(Context); 7063 if (ClassDecl->isInvalidDecl()) 7064 return ExceptSpec; 7065 7066 // Direct base-class destructors. 7067 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7068 BEnd = ClassDecl->bases_end(); 7069 B != BEnd; ++B) { 7070 if (B->isVirtual()) // Handled below. 7071 continue; 7072 7073 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7074 ExceptSpec.CalledDecl( 7075 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7076 } 7077 7078 // Virtual base-class destructors. 7079 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7080 BEnd = ClassDecl->vbases_end(); 7081 B != BEnd; ++B) { 7082 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7083 ExceptSpec.CalledDecl( 7084 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7085 } 7086 7087 // Field destructors. 7088 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7089 FEnd = ClassDecl->field_end(); 7090 F != FEnd; ++F) { 7091 if (const RecordType *RecordTy 7092 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7093 ExceptSpec.CalledDecl( 7094 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7095 } 7096 7097 return ExceptSpec; 7098} 7099 7100CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7101 // C++ [class.dtor]p2: 7102 // If a class has no user-declared destructor, a destructor is 7103 // declared implicitly. An implicitly-declared destructor is an 7104 // inline public member of its class. 7105 7106 ImplicitExceptionSpecification Spec = 7107 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7108 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7109 7110 // Create the actual destructor declaration. 7111 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7112 7113 CanQualType ClassType 7114 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7115 SourceLocation ClassLoc = ClassDecl->getLocation(); 7116 DeclarationName Name 7117 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7118 DeclarationNameInfo NameInfo(Name, ClassLoc); 7119 CXXDestructorDecl *Destructor 7120 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7121 /*isInline=*/true, 7122 /*isImplicitlyDeclared=*/true); 7123 Destructor->setAccess(AS_public); 7124 Destructor->setDefaulted(); 7125 Destructor->setImplicit(); 7126 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7127 7128 // Note that we have declared this destructor. 7129 ++ASTContext::NumImplicitDestructorsDeclared; 7130 7131 // Introduce this destructor into its scope. 7132 if (Scope *S = getScopeForContext(ClassDecl)) 7133 PushOnScopeChains(Destructor, S, false); 7134 ClassDecl->addDecl(Destructor); 7135 7136 // This could be uniqued if it ever proves significant. 7137 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7138 7139 if (ShouldDeleteDestructor(Destructor)) 7140 Destructor->setDeletedAsWritten(); 7141 7142 AddOverriddenMethods(ClassDecl, Destructor); 7143 7144 return Destructor; 7145} 7146 7147void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7148 CXXDestructorDecl *Destructor) { 7149 assert((Destructor->isDefaulted() && 7150 !Destructor->doesThisDeclarationHaveABody()) && 7151 "DefineImplicitDestructor - call it for implicit default dtor"); 7152 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7153 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7154 7155 if (Destructor->isInvalidDecl()) 7156 return; 7157 7158 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7159 7160 DiagnosticErrorTrap Trap(Diags); 7161 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7162 Destructor->getParent()); 7163 7164 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7165 Diag(CurrentLocation, diag::note_member_synthesized_at) 7166 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7167 7168 Destructor->setInvalidDecl(); 7169 return; 7170 } 7171 7172 SourceLocation Loc = Destructor->getLocation(); 7173 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7174 Destructor->setImplicitlyDefined(true); 7175 Destructor->setUsed(); 7176 MarkVTableUsed(CurrentLocation, ClassDecl); 7177 7178 if (ASTMutationListener *L = getASTMutationListener()) { 7179 L->CompletedImplicitDefinition(Destructor); 7180 } 7181} 7182 7183void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7184 CXXDestructorDecl *destructor) { 7185 // C++11 [class.dtor]p3: 7186 // A declaration of a destructor that does not have an exception- 7187 // specification is implicitly considered to have the same exception- 7188 // specification as an implicit declaration. 7189 const FunctionProtoType *dtorType = destructor->getType()-> 7190 getAs<FunctionProtoType>(); 7191 if (dtorType->hasExceptionSpec()) 7192 return; 7193 7194 ImplicitExceptionSpecification exceptSpec = 7195 ComputeDefaultedDtorExceptionSpec(classDecl); 7196 7197 // Replace the destructor's type, building off the existing one. Fortunately, 7198 // the only thing of interest in the destructor type is its extended info. 7199 // The return and arguments are fixed. 7200 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7201 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7202 epi.NumExceptions = exceptSpec.size(); 7203 epi.Exceptions = exceptSpec.data(); 7204 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7205 7206 destructor->setType(ty); 7207 7208 // FIXME: If the destructor has a body that could throw, and the newly created 7209 // spec doesn't allow exceptions, we should emit a warning, because this 7210 // change in behavior can break conforming C++03 programs at runtime. 7211 // However, we don't have a body yet, so it needs to be done somewhere else. 7212} 7213 7214/// \brief Builds a statement that copies/moves the given entity from \p From to 7215/// \c To. 7216/// 7217/// This routine is used to copy/move the members of a class with an 7218/// implicitly-declared copy/move assignment operator. When the entities being 7219/// copied are arrays, this routine builds for loops to copy them. 7220/// 7221/// \param S The Sema object used for type-checking. 7222/// 7223/// \param Loc The location where the implicit copy/move is being generated. 7224/// 7225/// \param T The type of the expressions being copied/moved. Both expressions 7226/// must have this type. 7227/// 7228/// \param To The expression we are copying/moving to. 7229/// 7230/// \param From The expression we are copying/moving from. 7231/// 7232/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7233/// Otherwise, it's a non-static member subobject. 7234/// 7235/// \param Copying Whether we're copying or moving. 7236/// 7237/// \param Depth Internal parameter recording the depth of the recursion. 7238/// 7239/// \returns A statement or a loop that copies the expressions. 7240static StmtResult 7241BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7242 Expr *To, Expr *From, 7243 bool CopyingBaseSubobject, bool Copying, 7244 unsigned Depth = 0) { 7245 // C++0x [class.copy]p28: 7246 // Each subobject is assigned in the manner appropriate to its type: 7247 // 7248 // - if the subobject is of class type, as if by a call to operator= with 7249 // the subobject as the object expression and the corresponding 7250 // subobject of x as a single function argument (as if by explicit 7251 // qualification; that is, ignoring any possible virtual overriding 7252 // functions in more derived classes); 7253 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7254 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7255 7256 // Look for operator=. 7257 DeclarationName Name 7258 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7259 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7260 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7261 7262 // Filter out any result that isn't a copy/move-assignment operator. 7263 LookupResult::Filter F = OpLookup.makeFilter(); 7264 while (F.hasNext()) { 7265 NamedDecl *D = F.next(); 7266 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7267 if (Copying ? Method->isCopyAssignmentOperator() : 7268 Method->isMoveAssignmentOperator()) 7269 continue; 7270 7271 F.erase(); 7272 } 7273 F.done(); 7274 7275 // Suppress the protected check (C++ [class.protected]) for each of the 7276 // assignment operators we found. This strange dance is required when 7277 // we're assigning via a base classes's copy-assignment operator. To 7278 // ensure that we're getting the right base class subobject (without 7279 // ambiguities), we need to cast "this" to that subobject type; to 7280 // ensure that we don't go through the virtual call mechanism, we need 7281 // to qualify the operator= name with the base class (see below). However, 7282 // this means that if the base class has a protected copy assignment 7283 // operator, the protected member access check will fail. So, we 7284 // rewrite "protected" access to "public" access in this case, since we 7285 // know by construction that we're calling from a derived class. 7286 if (CopyingBaseSubobject) { 7287 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7288 L != LEnd; ++L) { 7289 if (L.getAccess() == AS_protected) 7290 L.setAccess(AS_public); 7291 } 7292 } 7293 7294 // Create the nested-name-specifier that will be used to qualify the 7295 // reference to operator=; this is required to suppress the virtual 7296 // call mechanism. 7297 CXXScopeSpec SS; 7298 SS.MakeTrivial(S.Context, 7299 NestedNameSpecifier::Create(S.Context, 0, false, 7300 T.getTypePtr()), 7301 Loc); 7302 7303 // Create the reference to operator=. 7304 ExprResult OpEqualRef 7305 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7306 /*FirstQualifierInScope=*/0, OpLookup, 7307 /*TemplateArgs=*/0, 7308 /*SuppressQualifierCheck=*/true); 7309 if (OpEqualRef.isInvalid()) 7310 return StmtError(); 7311 7312 // Build the call to the assignment operator. 7313 7314 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7315 OpEqualRef.takeAs<Expr>(), 7316 Loc, &From, 1, Loc); 7317 if (Call.isInvalid()) 7318 return StmtError(); 7319 7320 return S.Owned(Call.takeAs<Stmt>()); 7321 } 7322 7323 // - if the subobject is of scalar type, the built-in assignment 7324 // operator is used. 7325 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7326 if (!ArrayTy) { 7327 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7328 if (Assignment.isInvalid()) 7329 return StmtError(); 7330 7331 return S.Owned(Assignment.takeAs<Stmt>()); 7332 } 7333 7334 // - if the subobject is an array, each element is assigned, in the 7335 // manner appropriate to the element type; 7336 7337 // Construct a loop over the array bounds, e.g., 7338 // 7339 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7340 // 7341 // that will copy each of the array elements. 7342 QualType SizeType = S.Context.getSizeType(); 7343 7344 // Create the iteration variable. 7345 IdentifierInfo *IterationVarName = 0; 7346 { 7347 llvm::SmallString<8> Str; 7348 llvm::raw_svector_ostream OS(Str); 7349 OS << "__i" << Depth; 7350 IterationVarName = &S.Context.Idents.get(OS.str()); 7351 } 7352 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7353 IterationVarName, SizeType, 7354 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7355 SC_None, SC_None); 7356 7357 // Initialize the iteration variable to zero. 7358 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7359 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7360 7361 // Create a reference to the iteration variable; we'll use this several 7362 // times throughout. 7363 Expr *IterationVarRef 7364 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7365 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7366 7367 // Create the DeclStmt that holds the iteration variable. 7368 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7369 7370 // Create the comparison against the array bound. 7371 llvm::APInt Upper 7372 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7373 Expr *Comparison 7374 = new (S.Context) BinaryOperator(IterationVarRef, 7375 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7376 BO_NE, S.Context.BoolTy, 7377 VK_RValue, OK_Ordinary, Loc); 7378 7379 // Create the pre-increment of the iteration variable. 7380 Expr *Increment 7381 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7382 VK_LValue, OK_Ordinary, Loc); 7383 7384 // Subscript the "from" and "to" expressions with the iteration variable. 7385 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7386 IterationVarRef, Loc)); 7387 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7388 IterationVarRef, Loc)); 7389 if (!Copying) // Cast to rvalue 7390 From = CastForMoving(S, From); 7391 7392 // Build the copy/move for an individual element of the array. 7393 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7394 To, From, CopyingBaseSubobject, 7395 Copying, Depth + 1); 7396 if (Copy.isInvalid()) 7397 return StmtError(); 7398 7399 // Construct the loop that copies all elements of this array. 7400 return S.ActOnForStmt(Loc, Loc, InitStmt, 7401 S.MakeFullExpr(Comparison), 7402 0, S.MakeFullExpr(Increment), 7403 Loc, Copy.take()); 7404} 7405 7406std::pair<Sema::ImplicitExceptionSpecification, bool> 7407Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7408 CXXRecordDecl *ClassDecl) { 7409 if (ClassDecl->isInvalidDecl()) 7410 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7411 7412 // C++ [class.copy]p10: 7413 // If the class definition does not explicitly declare a copy 7414 // assignment operator, one is declared implicitly. 7415 // The implicitly-defined copy assignment operator for a class X 7416 // will have the form 7417 // 7418 // X& X::operator=(const X&) 7419 // 7420 // if 7421 bool HasConstCopyAssignment = true; 7422 7423 // -- each direct base class B of X has a copy assignment operator 7424 // whose parameter is of type const B&, const volatile B& or B, 7425 // and 7426 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7427 BaseEnd = ClassDecl->bases_end(); 7428 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7429 // We'll handle this below 7430 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7431 continue; 7432 7433 assert(!Base->getType()->isDependentType() && 7434 "Cannot generate implicit members for class with dependent bases."); 7435 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7436 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7437 &HasConstCopyAssignment); 7438 } 7439 7440 // In C++11, the above citation has "or virtual" added 7441 if (LangOpts.CPlusPlus0x) { 7442 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7443 BaseEnd = ClassDecl->vbases_end(); 7444 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7445 assert(!Base->getType()->isDependentType() && 7446 "Cannot generate implicit members for class with dependent bases."); 7447 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7448 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7449 &HasConstCopyAssignment); 7450 } 7451 } 7452 7453 // -- for all the nonstatic data members of X that are of a class 7454 // type M (or array thereof), each such class type has a copy 7455 // assignment operator whose parameter is of type const M&, 7456 // const volatile M& or M. 7457 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7458 FieldEnd = ClassDecl->field_end(); 7459 HasConstCopyAssignment && Field != FieldEnd; 7460 ++Field) { 7461 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7462 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7463 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7464 &HasConstCopyAssignment); 7465 } 7466 } 7467 7468 // Otherwise, the implicitly declared copy assignment operator will 7469 // have the form 7470 // 7471 // X& X::operator=(X&) 7472 7473 // C++ [except.spec]p14: 7474 // An implicitly declared special member function (Clause 12) shall have an 7475 // exception-specification. [...] 7476 7477 // It is unspecified whether or not an implicit copy assignment operator 7478 // attempts to deduplicate calls to assignment operators of virtual bases are 7479 // made. As such, this exception specification is effectively unspecified. 7480 // Based on a similar decision made for constness in C++0x, we're erring on 7481 // the side of assuming such calls to be made regardless of whether they 7482 // actually happen. 7483 ImplicitExceptionSpecification ExceptSpec(Context); 7484 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7485 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7486 BaseEnd = ClassDecl->bases_end(); 7487 Base != BaseEnd; ++Base) { 7488 if (Base->isVirtual()) 7489 continue; 7490 7491 CXXRecordDecl *BaseClassDecl 7492 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7493 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7494 ArgQuals, false, 0)) 7495 ExceptSpec.CalledDecl(CopyAssign); 7496 } 7497 7498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7499 BaseEnd = ClassDecl->vbases_end(); 7500 Base != BaseEnd; ++Base) { 7501 CXXRecordDecl *BaseClassDecl 7502 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7503 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7504 ArgQuals, false, 0)) 7505 ExceptSpec.CalledDecl(CopyAssign); 7506 } 7507 7508 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7509 FieldEnd = ClassDecl->field_end(); 7510 Field != FieldEnd; 7511 ++Field) { 7512 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7513 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7514 if (CXXMethodDecl *CopyAssign = 7515 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7516 ExceptSpec.CalledDecl(CopyAssign); 7517 } 7518 } 7519 7520 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7521} 7522 7523CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7524 // Note: The following rules are largely analoguous to the copy 7525 // constructor rules. Note that virtual bases are not taken into account 7526 // for determining the argument type of the operator. Note also that 7527 // operators taking an object instead of a reference are allowed. 7528 7529 ImplicitExceptionSpecification Spec(Context); 7530 bool Const; 7531 llvm::tie(Spec, Const) = 7532 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7533 7534 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7535 QualType RetType = Context.getLValueReferenceType(ArgType); 7536 if (Const) 7537 ArgType = ArgType.withConst(); 7538 ArgType = Context.getLValueReferenceType(ArgType); 7539 7540 // An implicitly-declared copy assignment operator is an inline public 7541 // member of its class. 7542 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7543 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7544 SourceLocation ClassLoc = ClassDecl->getLocation(); 7545 DeclarationNameInfo NameInfo(Name, ClassLoc); 7546 CXXMethodDecl *CopyAssignment 7547 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7548 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7549 /*TInfo=*/0, /*isStatic=*/false, 7550 /*StorageClassAsWritten=*/SC_None, 7551 /*isInline=*/true, /*isConstexpr=*/false, 7552 SourceLocation()); 7553 CopyAssignment->setAccess(AS_public); 7554 CopyAssignment->setDefaulted(); 7555 CopyAssignment->setImplicit(); 7556 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7557 7558 // Add the parameter to the operator. 7559 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7560 ClassLoc, ClassLoc, /*Id=*/0, 7561 ArgType, /*TInfo=*/0, 7562 SC_None, 7563 SC_None, 0); 7564 CopyAssignment->setParams(FromParam); 7565 7566 // Note that we have added this copy-assignment operator. 7567 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7568 7569 if (Scope *S = getScopeForContext(ClassDecl)) 7570 PushOnScopeChains(CopyAssignment, S, false); 7571 ClassDecl->addDecl(CopyAssignment); 7572 7573 // C++0x [class.copy]p18: 7574 // ... If the class definition declares a move constructor or move 7575 // assignment operator, the implicitly declared copy assignment operator is 7576 // defined as deleted; ... 7577 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7578 ClassDecl->hasUserDeclaredMoveAssignment() || 7579 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7580 CopyAssignment->setDeletedAsWritten(); 7581 7582 AddOverriddenMethods(ClassDecl, CopyAssignment); 7583 return CopyAssignment; 7584} 7585 7586void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7587 CXXMethodDecl *CopyAssignOperator) { 7588 assert((CopyAssignOperator->isDefaulted() && 7589 CopyAssignOperator->isOverloadedOperator() && 7590 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7591 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7592 "DefineImplicitCopyAssignment called for wrong function"); 7593 7594 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7595 7596 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7597 CopyAssignOperator->setInvalidDecl(); 7598 return; 7599 } 7600 7601 CopyAssignOperator->setUsed(); 7602 7603 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7604 DiagnosticErrorTrap Trap(Diags); 7605 7606 // C++0x [class.copy]p30: 7607 // The implicitly-defined or explicitly-defaulted copy assignment operator 7608 // for a non-union class X performs memberwise copy assignment of its 7609 // subobjects. The direct base classes of X are assigned first, in the 7610 // order of their declaration in the base-specifier-list, and then the 7611 // immediate non-static data members of X are assigned, in the order in 7612 // which they were declared in the class definition. 7613 7614 // The statements that form the synthesized function body. 7615 ASTOwningVector<Stmt*> Statements(*this); 7616 7617 // The parameter for the "other" object, which we are copying from. 7618 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7619 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7620 QualType OtherRefType = Other->getType(); 7621 if (const LValueReferenceType *OtherRef 7622 = OtherRefType->getAs<LValueReferenceType>()) { 7623 OtherRefType = OtherRef->getPointeeType(); 7624 OtherQuals = OtherRefType.getQualifiers(); 7625 } 7626 7627 // Our location for everything implicitly-generated. 7628 SourceLocation Loc = CopyAssignOperator->getLocation(); 7629 7630 // Construct a reference to the "other" object. We'll be using this 7631 // throughout the generated ASTs. 7632 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7633 assert(OtherRef && "Reference to parameter cannot fail!"); 7634 7635 // Construct the "this" pointer. We'll be using this throughout the generated 7636 // ASTs. 7637 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7638 assert(This && "Reference to this cannot fail!"); 7639 7640 // Assign base classes. 7641 bool Invalid = false; 7642 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7643 E = ClassDecl->bases_end(); Base != E; ++Base) { 7644 // Form the assignment: 7645 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7646 QualType BaseType = Base->getType().getUnqualifiedType(); 7647 if (!BaseType->isRecordType()) { 7648 Invalid = true; 7649 continue; 7650 } 7651 7652 CXXCastPath BasePath; 7653 BasePath.push_back(Base); 7654 7655 // Construct the "from" expression, which is an implicit cast to the 7656 // appropriately-qualified base type. 7657 Expr *From = OtherRef; 7658 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7659 CK_UncheckedDerivedToBase, 7660 VK_LValue, &BasePath).take(); 7661 7662 // Dereference "this". 7663 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7664 7665 // Implicitly cast "this" to the appropriately-qualified base type. 7666 To = ImpCastExprToType(To.take(), 7667 Context.getCVRQualifiedType(BaseType, 7668 CopyAssignOperator->getTypeQualifiers()), 7669 CK_UncheckedDerivedToBase, 7670 VK_LValue, &BasePath); 7671 7672 // Build the copy. 7673 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7674 To.get(), From, 7675 /*CopyingBaseSubobject=*/true, 7676 /*Copying=*/true); 7677 if (Copy.isInvalid()) { 7678 Diag(CurrentLocation, diag::note_member_synthesized_at) 7679 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7680 CopyAssignOperator->setInvalidDecl(); 7681 return; 7682 } 7683 7684 // Success! Record the copy. 7685 Statements.push_back(Copy.takeAs<Expr>()); 7686 } 7687 7688 // \brief Reference to the __builtin_memcpy function. 7689 Expr *BuiltinMemCpyRef = 0; 7690 // \brief Reference to the __builtin_objc_memmove_collectable function. 7691 Expr *CollectableMemCpyRef = 0; 7692 7693 // Assign non-static members. 7694 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7695 FieldEnd = ClassDecl->field_end(); 7696 Field != FieldEnd; ++Field) { 7697 if (Field->isUnnamedBitfield()) 7698 continue; 7699 7700 // Check for members of reference type; we can't copy those. 7701 if (Field->getType()->isReferenceType()) { 7702 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7703 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7704 Diag(Field->getLocation(), diag::note_declared_at); 7705 Diag(CurrentLocation, diag::note_member_synthesized_at) 7706 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7707 Invalid = true; 7708 continue; 7709 } 7710 7711 // Check for members of const-qualified, non-class type. 7712 QualType BaseType = Context.getBaseElementType(Field->getType()); 7713 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7714 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7715 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7716 Diag(Field->getLocation(), diag::note_declared_at); 7717 Diag(CurrentLocation, diag::note_member_synthesized_at) 7718 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7719 Invalid = true; 7720 continue; 7721 } 7722 7723 // Suppress assigning zero-width bitfields. 7724 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7725 continue; 7726 7727 QualType FieldType = Field->getType().getNonReferenceType(); 7728 if (FieldType->isIncompleteArrayType()) { 7729 assert(ClassDecl->hasFlexibleArrayMember() && 7730 "Incomplete array type is not valid"); 7731 continue; 7732 } 7733 7734 // Build references to the field in the object we're copying from and to. 7735 CXXScopeSpec SS; // Intentionally empty 7736 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7737 LookupMemberName); 7738 MemberLookup.addDecl(*Field); 7739 MemberLookup.resolveKind(); 7740 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7741 Loc, /*IsArrow=*/false, 7742 SS, 0, MemberLookup, 0); 7743 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7744 Loc, /*IsArrow=*/true, 7745 SS, 0, MemberLookup, 0); 7746 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7747 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7748 7749 // If the field should be copied with __builtin_memcpy rather than via 7750 // explicit assignments, do so. This optimization only applies for arrays 7751 // of scalars and arrays of class type with trivial copy-assignment 7752 // operators. 7753 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7754 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7755 // Compute the size of the memory buffer to be copied. 7756 QualType SizeType = Context.getSizeType(); 7757 llvm::APInt Size(Context.getTypeSize(SizeType), 7758 Context.getTypeSizeInChars(BaseType).getQuantity()); 7759 for (const ConstantArrayType *Array 7760 = Context.getAsConstantArrayType(FieldType); 7761 Array; 7762 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7763 llvm::APInt ArraySize 7764 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7765 Size *= ArraySize; 7766 } 7767 7768 // Take the address of the field references for "from" and "to". 7769 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7770 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7771 7772 bool NeedsCollectableMemCpy = 7773 (BaseType->isRecordType() && 7774 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7775 7776 if (NeedsCollectableMemCpy) { 7777 if (!CollectableMemCpyRef) { 7778 // Create a reference to the __builtin_objc_memmove_collectable function. 7779 LookupResult R(*this, 7780 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7781 Loc, LookupOrdinaryName); 7782 LookupName(R, TUScope, true); 7783 7784 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7785 if (!CollectableMemCpy) { 7786 // Something went horribly wrong earlier, and we will have 7787 // complained about it. 7788 Invalid = true; 7789 continue; 7790 } 7791 7792 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7793 CollectableMemCpy->getType(), 7794 VK_LValue, Loc, 0).take(); 7795 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7796 } 7797 } 7798 // Create a reference to the __builtin_memcpy builtin function. 7799 else if (!BuiltinMemCpyRef) { 7800 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7801 LookupOrdinaryName); 7802 LookupName(R, TUScope, true); 7803 7804 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7805 if (!BuiltinMemCpy) { 7806 // Something went horribly wrong earlier, and we will have complained 7807 // about it. 7808 Invalid = true; 7809 continue; 7810 } 7811 7812 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7813 BuiltinMemCpy->getType(), 7814 VK_LValue, Loc, 0).take(); 7815 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7816 } 7817 7818 ASTOwningVector<Expr*> CallArgs(*this); 7819 CallArgs.push_back(To.takeAs<Expr>()); 7820 CallArgs.push_back(From.takeAs<Expr>()); 7821 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7822 ExprResult Call = ExprError(); 7823 if (NeedsCollectableMemCpy) 7824 Call = ActOnCallExpr(/*Scope=*/0, 7825 CollectableMemCpyRef, 7826 Loc, move_arg(CallArgs), 7827 Loc); 7828 else 7829 Call = ActOnCallExpr(/*Scope=*/0, 7830 BuiltinMemCpyRef, 7831 Loc, move_arg(CallArgs), 7832 Loc); 7833 7834 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7835 Statements.push_back(Call.takeAs<Expr>()); 7836 continue; 7837 } 7838 7839 // Build the copy of this field. 7840 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7841 To.get(), From.get(), 7842 /*CopyingBaseSubobject=*/false, 7843 /*Copying=*/true); 7844 if (Copy.isInvalid()) { 7845 Diag(CurrentLocation, diag::note_member_synthesized_at) 7846 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7847 CopyAssignOperator->setInvalidDecl(); 7848 return; 7849 } 7850 7851 // Success! Record the copy. 7852 Statements.push_back(Copy.takeAs<Stmt>()); 7853 } 7854 7855 if (!Invalid) { 7856 // Add a "return *this;" 7857 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7858 7859 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7860 if (Return.isInvalid()) 7861 Invalid = true; 7862 else { 7863 Statements.push_back(Return.takeAs<Stmt>()); 7864 7865 if (Trap.hasErrorOccurred()) { 7866 Diag(CurrentLocation, diag::note_member_synthesized_at) 7867 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7868 Invalid = true; 7869 } 7870 } 7871 } 7872 7873 if (Invalid) { 7874 CopyAssignOperator->setInvalidDecl(); 7875 return; 7876 } 7877 7878 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7879 /*isStmtExpr=*/false); 7880 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7881 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7882 7883 if (ASTMutationListener *L = getASTMutationListener()) { 7884 L->CompletedImplicitDefinition(CopyAssignOperator); 7885 } 7886} 7887 7888Sema::ImplicitExceptionSpecification 7889Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7890 ImplicitExceptionSpecification ExceptSpec(Context); 7891 7892 if (ClassDecl->isInvalidDecl()) 7893 return ExceptSpec; 7894 7895 // C++0x [except.spec]p14: 7896 // An implicitly declared special member function (Clause 12) shall have an 7897 // exception-specification. [...] 7898 7899 // It is unspecified whether or not an implicit move assignment operator 7900 // attempts to deduplicate calls to assignment operators of virtual bases are 7901 // made. As such, this exception specification is effectively unspecified. 7902 // Based on a similar decision made for constness in C++0x, we're erring on 7903 // the side of assuming such calls to be made regardless of whether they 7904 // actually happen. 7905 // Note that a move constructor is not implicitly declared when there are 7906 // virtual bases, but it can still be user-declared and explicitly defaulted. 7907 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7908 BaseEnd = ClassDecl->bases_end(); 7909 Base != BaseEnd; ++Base) { 7910 if (Base->isVirtual()) 7911 continue; 7912 7913 CXXRecordDecl *BaseClassDecl 7914 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7915 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7916 false, 0)) 7917 ExceptSpec.CalledDecl(MoveAssign); 7918 } 7919 7920 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7921 BaseEnd = ClassDecl->vbases_end(); 7922 Base != BaseEnd; ++Base) { 7923 CXXRecordDecl *BaseClassDecl 7924 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7925 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7926 false, 0)) 7927 ExceptSpec.CalledDecl(MoveAssign); 7928 } 7929 7930 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7931 FieldEnd = ClassDecl->field_end(); 7932 Field != FieldEnd; 7933 ++Field) { 7934 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7935 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7936 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7937 false, 0)) 7938 ExceptSpec.CalledDecl(MoveAssign); 7939 } 7940 } 7941 7942 return ExceptSpec; 7943} 7944 7945CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7946 // Note: The following rules are largely analoguous to the move 7947 // constructor rules. 7948 7949 ImplicitExceptionSpecification Spec( 7950 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7951 7952 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7953 QualType RetType = Context.getLValueReferenceType(ArgType); 7954 ArgType = Context.getRValueReferenceType(ArgType); 7955 7956 // An implicitly-declared move assignment operator is an inline public 7957 // member of its class. 7958 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7959 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7960 SourceLocation ClassLoc = ClassDecl->getLocation(); 7961 DeclarationNameInfo NameInfo(Name, ClassLoc); 7962 CXXMethodDecl *MoveAssignment 7963 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7964 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7965 /*TInfo=*/0, /*isStatic=*/false, 7966 /*StorageClassAsWritten=*/SC_None, 7967 /*isInline=*/true, 7968 /*isConstexpr=*/false, 7969 SourceLocation()); 7970 MoveAssignment->setAccess(AS_public); 7971 MoveAssignment->setDefaulted(); 7972 MoveAssignment->setImplicit(); 7973 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7974 7975 // Add the parameter to the operator. 7976 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7977 ClassLoc, ClassLoc, /*Id=*/0, 7978 ArgType, /*TInfo=*/0, 7979 SC_None, 7980 SC_None, 0); 7981 MoveAssignment->setParams(FromParam); 7982 7983 // Note that we have added this copy-assignment operator. 7984 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7985 7986 // C++0x [class.copy]p9: 7987 // If the definition of a class X does not explicitly declare a move 7988 // assignment operator, one will be implicitly declared as defaulted if and 7989 // only if: 7990 // [...] 7991 // - the move assignment operator would not be implicitly defined as 7992 // deleted. 7993 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7994 // Cache this result so that we don't try to generate this over and over 7995 // on every lookup, leaking memory and wasting time. 7996 ClassDecl->setFailedImplicitMoveAssignment(); 7997 return 0; 7998 } 7999 8000 if (Scope *S = getScopeForContext(ClassDecl)) 8001 PushOnScopeChains(MoveAssignment, S, false); 8002 ClassDecl->addDecl(MoveAssignment); 8003 8004 AddOverriddenMethods(ClassDecl, MoveAssignment); 8005 return MoveAssignment; 8006} 8007 8008void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8009 CXXMethodDecl *MoveAssignOperator) { 8010 assert((MoveAssignOperator->isDefaulted() && 8011 MoveAssignOperator->isOverloadedOperator() && 8012 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8013 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8014 "DefineImplicitMoveAssignment called for wrong function"); 8015 8016 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8017 8018 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8019 MoveAssignOperator->setInvalidDecl(); 8020 return; 8021 } 8022 8023 MoveAssignOperator->setUsed(); 8024 8025 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8026 DiagnosticErrorTrap Trap(Diags); 8027 8028 // C++0x [class.copy]p28: 8029 // The implicitly-defined or move assignment operator for a non-union class 8030 // X performs memberwise move assignment of its subobjects. The direct base 8031 // classes of X are assigned first, in the order of their declaration in the 8032 // base-specifier-list, and then the immediate non-static data members of X 8033 // are assigned, in the order in which they were declared in the class 8034 // definition. 8035 8036 // The statements that form the synthesized function body. 8037 ASTOwningVector<Stmt*> Statements(*this); 8038 8039 // The parameter for the "other" object, which we are move from. 8040 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8041 QualType OtherRefType = Other->getType()-> 8042 getAs<RValueReferenceType>()->getPointeeType(); 8043 assert(OtherRefType.getQualifiers() == 0 && 8044 "Bad argument type of defaulted move assignment"); 8045 8046 // Our location for everything implicitly-generated. 8047 SourceLocation Loc = MoveAssignOperator->getLocation(); 8048 8049 // Construct a reference to the "other" object. We'll be using this 8050 // throughout the generated ASTs. 8051 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8052 assert(OtherRef && "Reference to parameter cannot fail!"); 8053 // Cast to rvalue. 8054 OtherRef = CastForMoving(*this, OtherRef); 8055 8056 // Construct the "this" pointer. We'll be using this throughout the generated 8057 // ASTs. 8058 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8059 assert(This && "Reference to this cannot fail!"); 8060 8061 // Assign base classes. 8062 bool Invalid = false; 8063 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8064 E = ClassDecl->bases_end(); Base != E; ++Base) { 8065 // Form the assignment: 8066 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8067 QualType BaseType = Base->getType().getUnqualifiedType(); 8068 if (!BaseType->isRecordType()) { 8069 Invalid = true; 8070 continue; 8071 } 8072 8073 CXXCastPath BasePath; 8074 BasePath.push_back(Base); 8075 8076 // Construct the "from" expression, which is an implicit cast to the 8077 // appropriately-qualified base type. 8078 Expr *From = OtherRef; 8079 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8080 VK_XValue, &BasePath).take(); 8081 8082 // Dereference "this". 8083 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8084 8085 // Implicitly cast "this" to the appropriately-qualified base type. 8086 To = ImpCastExprToType(To.take(), 8087 Context.getCVRQualifiedType(BaseType, 8088 MoveAssignOperator->getTypeQualifiers()), 8089 CK_UncheckedDerivedToBase, 8090 VK_LValue, &BasePath); 8091 8092 // Build the move. 8093 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8094 To.get(), From, 8095 /*CopyingBaseSubobject=*/true, 8096 /*Copying=*/false); 8097 if (Move.isInvalid()) { 8098 Diag(CurrentLocation, diag::note_member_synthesized_at) 8099 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8100 MoveAssignOperator->setInvalidDecl(); 8101 return; 8102 } 8103 8104 // Success! Record the move. 8105 Statements.push_back(Move.takeAs<Expr>()); 8106 } 8107 8108 // \brief Reference to the __builtin_memcpy function. 8109 Expr *BuiltinMemCpyRef = 0; 8110 // \brief Reference to the __builtin_objc_memmove_collectable function. 8111 Expr *CollectableMemCpyRef = 0; 8112 8113 // Assign non-static members. 8114 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8115 FieldEnd = ClassDecl->field_end(); 8116 Field != FieldEnd; ++Field) { 8117 if (Field->isUnnamedBitfield()) 8118 continue; 8119 8120 // Check for members of reference type; we can't move those. 8121 if (Field->getType()->isReferenceType()) { 8122 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8123 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8124 Diag(Field->getLocation(), diag::note_declared_at); 8125 Diag(CurrentLocation, diag::note_member_synthesized_at) 8126 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8127 Invalid = true; 8128 continue; 8129 } 8130 8131 // Check for members of const-qualified, non-class type. 8132 QualType BaseType = Context.getBaseElementType(Field->getType()); 8133 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8134 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8135 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8136 Diag(Field->getLocation(), diag::note_declared_at); 8137 Diag(CurrentLocation, diag::note_member_synthesized_at) 8138 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8139 Invalid = true; 8140 continue; 8141 } 8142 8143 // Suppress assigning zero-width bitfields. 8144 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8145 continue; 8146 8147 QualType FieldType = Field->getType().getNonReferenceType(); 8148 if (FieldType->isIncompleteArrayType()) { 8149 assert(ClassDecl->hasFlexibleArrayMember() && 8150 "Incomplete array type is not valid"); 8151 continue; 8152 } 8153 8154 // Build references to the field in the object we're copying from and to. 8155 CXXScopeSpec SS; // Intentionally empty 8156 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8157 LookupMemberName); 8158 MemberLookup.addDecl(*Field); 8159 MemberLookup.resolveKind(); 8160 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8161 Loc, /*IsArrow=*/false, 8162 SS, 0, MemberLookup, 0); 8163 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8164 Loc, /*IsArrow=*/true, 8165 SS, 0, MemberLookup, 0); 8166 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8167 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8168 8169 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8170 "Member reference with rvalue base must be rvalue except for reference " 8171 "members, which aren't allowed for move assignment."); 8172 8173 // If the field should be copied with __builtin_memcpy rather than via 8174 // explicit assignments, do so. This optimization only applies for arrays 8175 // of scalars and arrays of class type with trivial move-assignment 8176 // operators. 8177 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8178 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8179 // Compute the size of the memory buffer to be copied. 8180 QualType SizeType = Context.getSizeType(); 8181 llvm::APInt Size(Context.getTypeSize(SizeType), 8182 Context.getTypeSizeInChars(BaseType).getQuantity()); 8183 for (const ConstantArrayType *Array 8184 = Context.getAsConstantArrayType(FieldType); 8185 Array; 8186 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8187 llvm::APInt ArraySize 8188 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8189 Size *= ArraySize; 8190 } 8191 8192 // Take the address of the field references for "from" and "to". We 8193 // directly construct UnaryOperators here because semantic analysis 8194 // does not permit us to take the address of an xvalue. 8195 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8196 Context.getPointerType(From.get()->getType()), 8197 VK_RValue, OK_Ordinary, Loc); 8198 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8199 Context.getPointerType(To.get()->getType()), 8200 VK_RValue, OK_Ordinary, Loc); 8201 8202 bool NeedsCollectableMemCpy = 8203 (BaseType->isRecordType() && 8204 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8205 8206 if (NeedsCollectableMemCpy) { 8207 if (!CollectableMemCpyRef) { 8208 // Create a reference to the __builtin_objc_memmove_collectable function. 8209 LookupResult R(*this, 8210 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8211 Loc, LookupOrdinaryName); 8212 LookupName(R, TUScope, true); 8213 8214 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8215 if (!CollectableMemCpy) { 8216 // Something went horribly wrong earlier, and we will have 8217 // complained about it. 8218 Invalid = true; 8219 continue; 8220 } 8221 8222 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8223 CollectableMemCpy->getType(), 8224 VK_LValue, Loc, 0).take(); 8225 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8226 } 8227 } 8228 // Create a reference to the __builtin_memcpy builtin function. 8229 else if (!BuiltinMemCpyRef) { 8230 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8231 LookupOrdinaryName); 8232 LookupName(R, TUScope, true); 8233 8234 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8235 if (!BuiltinMemCpy) { 8236 // Something went horribly wrong earlier, and we will have complained 8237 // about it. 8238 Invalid = true; 8239 continue; 8240 } 8241 8242 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8243 BuiltinMemCpy->getType(), 8244 VK_LValue, Loc, 0).take(); 8245 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8246 } 8247 8248 ASTOwningVector<Expr*> CallArgs(*this); 8249 CallArgs.push_back(To.takeAs<Expr>()); 8250 CallArgs.push_back(From.takeAs<Expr>()); 8251 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8252 ExprResult Call = ExprError(); 8253 if (NeedsCollectableMemCpy) 8254 Call = ActOnCallExpr(/*Scope=*/0, 8255 CollectableMemCpyRef, 8256 Loc, move_arg(CallArgs), 8257 Loc); 8258 else 8259 Call = ActOnCallExpr(/*Scope=*/0, 8260 BuiltinMemCpyRef, 8261 Loc, move_arg(CallArgs), 8262 Loc); 8263 8264 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8265 Statements.push_back(Call.takeAs<Expr>()); 8266 continue; 8267 } 8268 8269 // Build the move of this field. 8270 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8271 To.get(), From.get(), 8272 /*CopyingBaseSubobject=*/false, 8273 /*Copying=*/false); 8274 if (Move.isInvalid()) { 8275 Diag(CurrentLocation, diag::note_member_synthesized_at) 8276 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8277 MoveAssignOperator->setInvalidDecl(); 8278 return; 8279 } 8280 8281 // Success! Record the copy. 8282 Statements.push_back(Move.takeAs<Stmt>()); 8283 } 8284 8285 if (!Invalid) { 8286 // Add a "return *this;" 8287 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8288 8289 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8290 if (Return.isInvalid()) 8291 Invalid = true; 8292 else { 8293 Statements.push_back(Return.takeAs<Stmt>()); 8294 8295 if (Trap.hasErrorOccurred()) { 8296 Diag(CurrentLocation, diag::note_member_synthesized_at) 8297 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8298 Invalid = true; 8299 } 8300 } 8301 } 8302 8303 if (Invalid) { 8304 MoveAssignOperator->setInvalidDecl(); 8305 return; 8306 } 8307 8308 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8309 /*isStmtExpr=*/false); 8310 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8311 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8312 8313 if (ASTMutationListener *L = getASTMutationListener()) { 8314 L->CompletedImplicitDefinition(MoveAssignOperator); 8315 } 8316} 8317 8318std::pair<Sema::ImplicitExceptionSpecification, bool> 8319Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8320 if (ClassDecl->isInvalidDecl()) 8321 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8322 8323 // C++ [class.copy]p5: 8324 // The implicitly-declared copy constructor for a class X will 8325 // have the form 8326 // 8327 // X::X(const X&) 8328 // 8329 // if 8330 // FIXME: It ought to be possible to store this on the record. 8331 bool HasConstCopyConstructor = true; 8332 8333 // -- each direct or virtual base class B of X has a copy 8334 // constructor whose first parameter is of type const B& or 8335 // const volatile B&, and 8336 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8337 BaseEnd = ClassDecl->bases_end(); 8338 HasConstCopyConstructor && Base != BaseEnd; 8339 ++Base) { 8340 // Virtual bases are handled below. 8341 if (Base->isVirtual()) 8342 continue; 8343 8344 CXXRecordDecl *BaseClassDecl 8345 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8346 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8347 &HasConstCopyConstructor); 8348 } 8349 8350 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8351 BaseEnd = ClassDecl->vbases_end(); 8352 HasConstCopyConstructor && Base != BaseEnd; 8353 ++Base) { 8354 CXXRecordDecl *BaseClassDecl 8355 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8356 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8357 &HasConstCopyConstructor); 8358 } 8359 8360 // -- for all the nonstatic data members of X that are of a 8361 // class type M (or array thereof), each such class type 8362 // has a copy constructor whose first parameter is of type 8363 // const M& or const volatile M&. 8364 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8365 FieldEnd = ClassDecl->field_end(); 8366 HasConstCopyConstructor && Field != FieldEnd; 8367 ++Field) { 8368 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8369 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8370 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8371 &HasConstCopyConstructor); 8372 } 8373 } 8374 // Otherwise, the implicitly declared copy constructor will have 8375 // the form 8376 // 8377 // X::X(X&) 8378 8379 // C++ [except.spec]p14: 8380 // An implicitly declared special member function (Clause 12) shall have an 8381 // exception-specification. [...] 8382 ImplicitExceptionSpecification ExceptSpec(Context); 8383 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8384 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8385 BaseEnd = ClassDecl->bases_end(); 8386 Base != BaseEnd; 8387 ++Base) { 8388 // Virtual bases are handled below. 8389 if (Base->isVirtual()) 8390 continue; 8391 8392 CXXRecordDecl *BaseClassDecl 8393 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8394 if (CXXConstructorDecl *CopyConstructor = 8395 LookupCopyingConstructor(BaseClassDecl, Quals)) 8396 ExceptSpec.CalledDecl(CopyConstructor); 8397 } 8398 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8399 BaseEnd = ClassDecl->vbases_end(); 8400 Base != BaseEnd; 8401 ++Base) { 8402 CXXRecordDecl *BaseClassDecl 8403 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8404 if (CXXConstructorDecl *CopyConstructor = 8405 LookupCopyingConstructor(BaseClassDecl, Quals)) 8406 ExceptSpec.CalledDecl(CopyConstructor); 8407 } 8408 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8409 FieldEnd = ClassDecl->field_end(); 8410 Field != FieldEnd; 8411 ++Field) { 8412 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8413 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8414 if (CXXConstructorDecl *CopyConstructor = 8415 LookupCopyingConstructor(FieldClassDecl, Quals)) 8416 ExceptSpec.CalledDecl(CopyConstructor); 8417 } 8418 } 8419 8420 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8421} 8422 8423CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8424 CXXRecordDecl *ClassDecl) { 8425 // C++ [class.copy]p4: 8426 // If the class definition does not explicitly declare a copy 8427 // constructor, one is declared implicitly. 8428 8429 ImplicitExceptionSpecification Spec(Context); 8430 bool Const; 8431 llvm::tie(Spec, Const) = 8432 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8433 8434 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8435 QualType ArgType = ClassType; 8436 if (Const) 8437 ArgType = ArgType.withConst(); 8438 ArgType = Context.getLValueReferenceType(ArgType); 8439 8440 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8441 8442 DeclarationName Name 8443 = Context.DeclarationNames.getCXXConstructorName( 8444 Context.getCanonicalType(ClassType)); 8445 SourceLocation ClassLoc = ClassDecl->getLocation(); 8446 DeclarationNameInfo NameInfo(Name, ClassLoc); 8447 8448 // An implicitly-declared copy constructor is an inline public 8449 // member of its class. 8450 CXXConstructorDecl *CopyConstructor 8451 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8452 Context.getFunctionType(Context.VoidTy, 8453 &ArgType, 1, EPI), 8454 /*TInfo=*/0, 8455 /*isExplicit=*/false, 8456 /*isInline=*/true, 8457 /*isImplicitlyDeclared=*/true, 8458 // FIXME: apply the rules for definitions here 8459 /*isConstexpr=*/false); 8460 CopyConstructor->setAccess(AS_public); 8461 CopyConstructor->setDefaulted(); 8462 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8463 8464 // Note that we have declared this constructor. 8465 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8466 8467 // Add the parameter to the constructor. 8468 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8469 ClassLoc, ClassLoc, 8470 /*IdentifierInfo=*/0, 8471 ArgType, /*TInfo=*/0, 8472 SC_None, 8473 SC_None, 0); 8474 CopyConstructor->setParams(FromParam); 8475 8476 if (Scope *S = getScopeForContext(ClassDecl)) 8477 PushOnScopeChains(CopyConstructor, S, false); 8478 ClassDecl->addDecl(CopyConstructor); 8479 8480 // C++0x [class.copy]p7: 8481 // ... If the class definition declares a move constructor or move 8482 // assignment operator, the implicitly declared constructor is defined as 8483 // deleted; ... 8484 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8485 ClassDecl->hasUserDeclaredMoveAssignment() || 8486 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8487 CopyConstructor->setDeletedAsWritten(); 8488 8489 return CopyConstructor; 8490} 8491 8492void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8493 CXXConstructorDecl *CopyConstructor) { 8494 assert((CopyConstructor->isDefaulted() && 8495 CopyConstructor->isCopyConstructor() && 8496 !CopyConstructor->doesThisDeclarationHaveABody()) && 8497 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8498 8499 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8500 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8501 8502 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8503 DiagnosticErrorTrap Trap(Diags); 8504 8505 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8506 Trap.hasErrorOccurred()) { 8507 Diag(CurrentLocation, diag::note_member_synthesized_at) 8508 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8509 CopyConstructor->setInvalidDecl(); 8510 } else { 8511 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8512 CopyConstructor->getLocation(), 8513 MultiStmtArg(*this, 0, 0), 8514 /*isStmtExpr=*/false) 8515 .takeAs<Stmt>()); 8516 CopyConstructor->setImplicitlyDefined(true); 8517 } 8518 8519 CopyConstructor->setUsed(); 8520 if (ASTMutationListener *L = getASTMutationListener()) { 8521 L->CompletedImplicitDefinition(CopyConstructor); 8522 } 8523} 8524 8525Sema::ImplicitExceptionSpecification 8526Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8527 // C++ [except.spec]p14: 8528 // An implicitly declared special member function (Clause 12) shall have an 8529 // exception-specification. [...] 8530 ImplicitExceptionSpecification ExceptSpec(Context); 8531 if (ClassDecl->isInvalidDecl()) 8532 return ExceptSpec; 8533 8534 // Direct base-class constructors. 8535 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8536 BEnd = ClassDecl->bases_end(); 8537 B != BEnd; ++B) { 8538 if (B->isVirtual()) // Handled below. 8539 continue; 8540 8541 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8542 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8543 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8544 // If this is a deleted function, add it anyway. This might be conformant 8545 // with the standard. This might not. I'm not sure. It might not matter. 8546 if (Constructor) 8547 ExceptSpec.CalledDecl(Constructor); 8548 } 8549 } 8550 8551 // Virtual base-class constructors. 8552 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8553 BEnd = ClassDecl->vbases_end(); 8554 B != BEnd; ++B) { 8555 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8556 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8557 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8558 // If this is a deleted function, add it anyway. This might be conformant 8559 // with the standard. This might not. I'm not sure. It might not matter. 8560 if (Constructor) 8561 ExceptSpec.CalledDecl(Constructor); 8562 } 8563 } 8564 8565 // Field constructors. 8566 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8567 FEnd = ClassDecl->field_end(); 8568 F != FEnd; ++F) { 8569 if (F->hasInClassInitializer()) { 8570 if (Expr *E = F->getInClassInitializer()) 8571 ExceptSpec.CalledExpr(E); 8572 else if (!F->isInvalidDecl()) 8573 ExceptSpec.SetDelayed(); 8574 } else if (const RecordType *RecordTy 8575 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8576 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8577 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8578 // If this is a deleted function, add it anyway. This might be conformant 8579 // with the standard. This might not. I'm not sure. It might not matter. 8580 // In particular, the problem is that this function never gets called. It 8581 // might just be ill-formed because this function attempts to refer to 8582 // a deleted function here. 8583 if (Constructor) 8584 ExceptSpec.CalledDecl(Constructor); 8585 } 8586 } 8587 8588 return ExceptSpec; 8589} 8590 8591CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8592 CXXRecordDecl *ClassDecl) { 8593 ImplicitExceptionSpecification Spec( 8594 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8595 8596 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8597 QualType ArgType = Context.getRValueReferenceType(ClassType); 8598 8599 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8600 8601 DeclarationName Name 8602 = Context.DeclarationNames.getCXXConstructorName( 8603 Context.getCanonicalType(ClassType)); 8604 SourceLocation ClassLoc = ClassDecl->getLocation(); 8605 DeclarationNameInfo NameInfo(Name, ClassLoc); 8606 8607 // C++0x [class.copy]p11: 8608 // An implicitly-declared copy/move constructor is an inline public 8609 // member of its class. 8610 CXXConstructorDecl *MoveConstructor 8611 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8612 Context.getFunctionType(Context.VoidTy, 8613 &ArgType, 1, EPI), 8614 /*TInfo=*/0, 8615 /*isExplicit=*/false, 8616 /*isInline=*/true, 8617 /*isImplicitlyDeclared=*/true, 8618 // FIXME: apply the rules for definitions here 8619 /*isConstexpr=*/false); 8620 MoveConstructor->setAccess(AS_public); 8621 MoveConstructor->setDefaulted(); 8622 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8623 8624 // Add the parameter to the constructor. 8625 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8626 ClassLoc, ClassLoc, 8627 /*IdentifierInfo=*/0, 8628 ArgType, /*TInfo=*/0, 8629 SC_None, 8630 SC_None, 0); 8631 MoveConstructor->setParams(FromParam); 8632 8633 // C++0x [class.copy]p9: 8634 // If the definition of a class X does not explicitly declare a move 8635 // constructor, one will be implicitly declared as defaulted if and only if: 8636 // [...] 8637 // - the move constructor would not be implicitly defined as deleted. 8638 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8639 // Cache this result so that we don't try to generate this over and over 8640 // on every lookup, leaking memory and wasting time. 8641 ClassDecl->setFailedImplicitMoveConstructor(); 8642 return 0; 8643 } 8644 8645 // Note that we have declared this constructor. 8646 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8647 8648 if (Scope *S = getScopeForContext(ClassDecl)) 8649 PushOnScopeChains(MoveConstructor, S, false); 8650 ClassDecl->addDecl(MoveConstructor); 8651 8652 return MoveConstructor; 8653} 8654 8655void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8656 CXXConstructorDecl *MoveConstructor) { 8657 assert((MoveConstructor->isDefaulted() && 8658 MoveConstructor->isMoveConstructor() && 8659 !MoveConstructor->doesThisDeclarationHaveABody()) && 8660 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8661 8662 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8663 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8664 8665 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8666 DiagnosticErrorTrap Trap(Diags); 8667 8668 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8669 Trap.hasErrorOccurred()) { 8670 Diag(CurrentLocation, diag::note_member_synthesized_at) 8671 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8672 MoveConstructor->setInvalidDecl(); 8673 } else { 8674 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8675 MoveConstructor->getLocation(), 8676 MultiStmtArg(*this, 0, 0), 8677 /*isStmtExpr=*/false) 8678 .takeAs<Stmt>()); 8679 MoveConstructor->setImplicitlyDefined(true); 8680 } 8681 8682 MoveConstructor->setUsed(); 8683 8684 if (ASTMutationListener *L = getASTMutationListener()) { 8685 L->CompletedImplicitDefinition(MoveConstructor); 8686 } 8687} 8688 8689ExprResult 8690Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8691 CXXConstructorDecl *Constructor, 8692 MultiExprArg ExprArgs, 8693 bool HadMultipleCandidates, 8694 bool RequiresZeroInit, 8695 unsigned ConstructKind, 8696 SourceRange ParenRange) { 8697 bool Elidable = false; 8698 8699 // C++0x [class.copy]p34: 8700 // When certain criteria are met, an implementation is allowed to 8701 // omit the copy/move construction of a class object, even if the 8702 // copy/move constructor and/or destructor for the object have 8703 // side effects. [...] 8704 // - when a temporary class object that has not been bound to a 8705 // reference (12.2) would be copied/moved to a class object 8706 // with the same cv-unqualified type, the copy/move operation 8707 // can be omitted by constructing the temporary object 8708 // directly into the target of the omitted copy/move 8709 if (ConstructKind == CXXConstructExpr::CK_Complete && 8710 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8711 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8712 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8713 } 8714 8715 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8716 Elidable, move(ExprArgs), HadMultipleCandidates, 8717 RequiresZeroInit, ConstructKind, ParenRange); 8718} 8719 8720/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8721/// including handling of its default argument expressions. 8722ExprResult 8723Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8724 CXXConstructorDecl *Constructor, bool Elidable, 8725 MultiExprArg ExprArgs, 8726 bool HadMultipleCandidates, 8727 bool RequiresZeroInit, 8728 unsigned ConstructKind, 8729 SourceRange ParenRange) { 8730 unsigned NumExprs = ExprArgs.size(); 8731 Expr **Exprs = (Expr **)ExprArgs.release(); 8732 8733 for (specific_attr_iterator<NonNullAttr> 8734 i = Constructor->specific_attr_begin<NonNullAttr>(), 8735 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8736 const NonNullAttr *NonNull = *i; 8737 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8738 } 8739 8740 MarkDeclarationReferenced(ConstructLoc, Constructor); 8741 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8742 Constructor, Elidable, Exprs, NumExprs, 8743 HadMultipleCandidates, RequiresZeroInit, 8744 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8745 ParenRange)); 8746} 8747 8748bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8749 CXXConstructorDecl *Constructor, 8750 MultiExprArg Exprs, 8751 bool HadMultipleCandidates) { 8752 // FIXME: Provide the correct paren SourceRange when available. 8753 ExprResult TempResult = 8754 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8755 move(Exprs), HadMultipleCandidates, false, 8756 CXXConstructExpr::CK_Complete, SourceRange()); 8757 if (TempResult.isInvalid()) 8758 return true; 8759 8760 Expr *Temp = TempResult.takeAs<Expr>(); 8761 CheckImplicitConversions(Temp, VD->getLocation()); 8762 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8763 Temp = MaybeCreateExprWithCleanups(Temp); 8764 VD->setInit(Temp); 8765 8766 return false; 8767} 8768 8769void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8770 if (VD->isInvalidDecl()) return; 8771 8772 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8773 if (ClassDecl->isInvalidDecl()) return; 8774 if (ClassDecl->hasTrivialDestructor()) return; 8775 if (ClassDecl->isDependentContext()) return; 8776 8777 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8778 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8779 CheckDestructorAccess(VD->getLocation(), Destructor, 8780 PDiag(diag::err_access_dtor_var) 8781 << VD->getDeclName() 8782 << VD->getType()); 8783 8784 if (!VD->hasGlobalStorage()) return; 8785 8786 // Emit warning for non-trivial dtor in global scope (a real global, 8787 // class-static, function-static). 8788 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8789 8790 // TODO: this should be re-enabled for static locals by !CXAAtExit 8791 if (!VD->isStaticLocal()) 8792 Diag(VD->getLocation(), diag::warn_global_destructor); 8793} 8794 8795/// AddCXXDirectInitializerToDecl - This action is called immediately after 8796/// ActOnDeclarator, when a C++ direct initializer is present. 8797/// e.g: "int x(1);" 8798void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8799 SourceLocation LParenLoc, 8800 MultiExprArg Exprs, 8801 SourceLocation RParenLoc, 8802 bool TypeMayContainAuto) { 8803 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8804 8805 // If there is no declaration, there was an error parsing it. Just ignore 8806 // the initializer. 8807 if (RealDecl == 0) 8808 return; 8809 8810 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8811 if (!VDecl) { 8812 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8813 RealDecl->setInvalidDecl(); 8814 return; 8815 } 8816 8817 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8818 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8819 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8820 if (Exprs.size() > 1) { 8821 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8822 diag::err_auto_var_init_multiple_expressions) 8823 << VDecl->getDeclName() << VDecl->getType() 8824 << VDecl->getSourceRange(); 8825 RealDecl->setInvalidDecl(); 8826 return; 8827 } 8828 8829 Expr *Init = Exprs.get()[0]; 8830 TypeSourceInfo *DeducedType = 0; 8831 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8832 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8833 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8834 << Init->getSourceRange(); 8835 if (!DeducedType) { 8836 RealDecl->setInvalidDecl(); 8837 return; 8838 } 8839 VDecl->setTypeSourceInfo(DeducedType); 8840 VDecl->setType(DeducedType->getType()); 8841 8842 // In ARC, infer lifetime. 8843 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8844 VDecl->setInvalidDecl(); 8845 8846 // If this is a redeclaration, check that the type we just deduced matches 8847 // the previously declared type. 8848 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8849 MergeVarDeclTypes(VDecl, Old); 8850 } 8851 8852 // We will represent direct-initialization similarly to copy-initialization: 8853 // int x(1); -as-> int x = 1; 8854 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8855 // 8856 // Clients that want to distinguish between the two forms, can check for 8857 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8858 // A major benefit is that clients that don't particularly care about which 8859 // exactly form was it (like the CodeGen) can handle both cases without 8860 // special case code. 8861 8862 // C++ 8.5p11: 8863 // The form of initialization (using parentheses or '=') is generally 8864 // insignificant, but does matter when the entity being initialized has a 8865 // class type. 8866 8867 if (!VDecl->getType()->isDependentType() && 8868 !VDecl->getType()->isIncompleteArrayType() && 8869 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8870 diag::err_typecheck_decl_incomplete_type)) { 8871 VDecl->setInvalidDecl(); 8872 return; 8873 } 8874 8875 // The variable can not have an abstract class type. 8876 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8877 diag::err_abstract_type_in_decl, 8878 AbstractVariableType)) 8879 VDecl->setInvalidDecl(); 8880 8881 const VarDecl *Def; 8882 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8883 Diag(VDecl->getLocation(), diag::err_redefinition) 8884 << VDecl->getDeclName(); 8885 Diag(Def->getLocation(), diag::note_previous_definition); 8886 VDecl->setInvalidDecl(); 8887 return; 8888 } 8889 8890 // C++ [class.static.data]p4 8891 // If a static data member is of const integral or const 8892 // enumeration type, its declaration in the class definition can 8893 // specify a constant-initializer which shall be an integral 8894 // constant expression (5.19). In that case, the member can appear 8895 // in integral constant expressions. The member shall still be 8896 // defined in a namespace scope if it is used in the program and the 8897 // namespace scope definition shall not contain an initializer. 8898 // 8899 // We already performed a redefinition check above, but for static 8900 // data members we also need to check whether there was an in-class 8901 // declaration with an initializer. 8902 const VarDecl* PrevInit = 0; 8903 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8904 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8905 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8906 return; 8907 } 8908 8909 bool IsDependent = false; 8910 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8911 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8912 VDecl->setInvalidDecl(); 8913 return; 8914 } 8915 8916 if (Exprs.get()[I]->isTypeDependent()) 8917 IsDependent = true; 8918 } 8919 8920 // If either the declaration has a dependent type or if any of the 8921 // expressions is type-dependent, we represent the initialization 8922 // via a ParenListExpr for later use during template instantiation. 8923 if (VDecl->getType()->isDependentType() || IsDependent) { 8924 // Let clients know that initialization was done with a direct initializer. 8925 VDecl->setCXXDirectInitializer(true); 8926 8927 // Store the initialization expressions as a ParenListExpr. 8928 unsigned NumExprs = Exprs.size(); 8929 VDecl->setInit(new (Context) ParenListExpr( 8930 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8931 VDecl->getType().getNonReferenceType())); 8932 return; 8933 } 8934 8935 // Capture the variable that is being initialized and the style of 8936 // initialization. 8937 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8938 8939 // FIXME: Poor source location information. 8940 InitializationKind Kind 8941 = InitializationKind::CreateDirect(VDecl->getLocation(), 8942 LParenLoc, RParenLoc); 8943 8944 QualType T = VDecl->getType(); 8945 InitializationSequence InitSeq(*this, Entity, Kind, 8946 Exprs.get(), Exprs.size()); 8947 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8948 if (Result.isInvalid()) { 8949 VDecl->setInvalidDecl(); 8950 return; 8951 } else if (T != VDecl->getType()) { 8952 VDecl->setType(T); 8953 Result.get()->setType(T); 8954 } 8955 8956 8957 Expr *Init = Result.get(); 8958 CheckImplicitConversions(Init, LParenLoc); 8959 8960 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 8961 !Init->isValueDependent() && 8962 !Init->isConstantInitializer(Context, 8963 VDecl->getType()->isReferenceType())) { 8964 // FIXME: Improve this diagnostic to explain why the initializer is not 8965 // a constant expression. 8966 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 8967 << VDecl << Init->getSourceRange(); 8968 } 8969 8970 Init = MaybeCreateExprWithCleanups(Init); 8971 VDecl->setInit(Init); 8972 VDecl->setCXXDirectInitializer(true); 8973 8974 CheckCompleteVariableDeclaration(VDecl); 8975} 8976 8977/// \brief Given a constructor and the set of arguments provided for the 8978/// constructor, convert the arguments and add any required default arguments 8979/// to form a proper call to this constructor. 8980/// 8981/// \returns true if an error occurred, false otherwise. 8982bool 8983Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8984 MultiExprArg ArgsPtr, 8985 SourceLocation Loc, 8986 ASTOwningVector<Expr*> &ConvertedArgs) { 8987 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8988 unsigned NumArgs = ArgsPtr.size(); 8989 Expr **Args = (Expr **)ArgsPtr.get(); 8990 8991 const FunctionProtoType *Proto 8992 = Constructor->getType()->getAs<FunctionProtoType>(); 8993 assert(Proto && "Constructor without a prototype?"); 8994 unsigned NumArgsInProto = Proto->getNumArgs(); 8995 8996 // If too few arguments are available, we'll fill in the rest with defaults. 8997 if (NumArgs < NumArgsInProto) 8998 ConvertedArgs.reserve(NumArgsInProto); 8999 else 9000 ConvertedArgs.reserve(NumArgs); 9001 9002 VariadicCallType CallType = 9003 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9004 SmallVector<Expr *, 8> AllArgs; 9005 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9006 Proto, 0, Args, NumArgs, AllArgs, 9007 CallType); 9008 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9009 ConvertedArgs.push_back(AllArgs[i]); 9010 return Invalid; 9011} 9012 9013static inline bool 9014CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9015 const FunctionDecl *FnDecl) { 9016 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9017 if (isa<NamespaceDecl>(DC)) { 9018 return SemaRef.Diag(FnDecl->getLocation(), 9019 diag::err_operator_new_delete_declared_in_namespace) 9020 << FnDecl->getDeclName(); 9021 } 9022 9023 if (isa<TranslationUnitDecl>(DC) && 9024 FnDecl->getStorageClass() == SC_Static) { 9025 return SemaRef.Diag(FnDecl->getLocation(), 9026 diag::err_operator_new_delete_declared_static) 9027 << FnDecl->getDeclName(); 9028 } 9029 9030 return false; 9031} 9032 9033static inline bool 9034CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9035 CanQualType ExpectedResultType, 9036 CanQualType ExpectedFirstParamType, 9037 unsigned DependentParamTypeDiag, 9038 unsigned InvalidParamTypeDiag) { 9039 QualType ResultType = 9040 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9041 9042 // Check that the result type is not dependent. 9043 if (ResultType->isDependentType()) 9044 return SemaRef.Diag(FnDecl->getLocation(), 9045 diag::err_operator_new_delete_dependent_result_type) 9046 << FnDecl->getDeclName() << ExpectedResultType; 9047 9048 // Check that the result type is what we expect. 9049 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9050 return SemaRef.Diag(FnDecl->getLocation(), 9051 diag::err_operator_new_delete_invalid_result_type) 9052 << FnDecl->getDeclName() << ExpectedResultType; 9053 9054 // A function template must have at least 2 parameters. 9055 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9056 return SemaRef.Diag(FnDecl->getLocation(), 9057 diag::err_operator_new_delete_template_too_few_parameters) 9058 << FnDecl->getDeclName(); 9059 9060 // The function decl must have at least 1 parameter. 9061 if (FnDecl->getNumParams() == 0) 9062 return SemaRef.Diag(FnDecl->getLocation(), 9063 diag::err_operator_new_delete_too_few_parameters) 9064 << FnDecl->getDeclName(); 9065 9066 // Check the the first parameter type is not dependent. 9067 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9068 if (FirstParamType->isDependentType()) 9069 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9070 << FnDecl->getDeclName() << ExpectedFirstParamType; 9071 9072 // Check that the first parameter type is what we expect. 9073 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9074 ExpectedFirstParamType) 9075 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9076 << FnDecl->getDeclName() << ExpectedFirstParamType; 9077 9078 return false; 9079} 9080 9081static bool 9082CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9083 // C++ [basic.stc.dynamic.allocation]p1: 9084 // A program is ill-formed if an allocation function is declared in a 9085 // namespace scope other than global scope or declared static in global 9086 // scope. 9087 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9088 return true; 9089 9090 CanQualType SizeTy = 9091 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9092 9093 // C++ [basic.stc.dynamic.allocation]p1: 9094 // The return type shall be void*. The first parameter shall have type 9095 // std::size_t. 9096 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9097 SizeTy, 9098 diag::err_operator_new_dependent_param_type, 9099 diag::err_operator_new_param_type)) 9100 return true; 9101 9102 // C++ [basic.stc.dynamic.allocation]p1: 9103 // The first parameter shall not have an associated default argument. 9104 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9105 return SemaRef.Diag(FnDecl->getLocation(), 9106 diag::err_operator_new_default_arg) 9107 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9108 9109 return false; 9110} 9111 9112static bool 9113CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9114 // C++ [basic.stc.dynamic.deallocation]p1: 9115 // A program is ill-formed if deallocation functions are declared in a 9116 // namespace scope other than global scope or declared static in global 9117 // scope. 9118 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9119 return true; 9120 9121 // C++ [basic.stc.dynamic.deallocation]p2: 9122 // Each deallocation function shall return void and its first parameter 9123 // shall be void*. 9124 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9125 SemaRef.Context.VoidPtrTy, 9126 diag::err_operator_delete_dependent_param_type, 9127 diag::err_operator_delete_param_type)) 9128 return true; 9129 9130 return false; 9131} 9132 9133/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9134/// of this overloaded operator is well-formed. If so, returns false; 9135/// otherwise, emits appropriate diagnostics and returns true. 9136bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9137 assert(FnDecl && FnDecl->isOverloadedOperator() && 9138 "Expected an overloaded operator declaration"); 9139 9140 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9141 9142 // C++ [over.oper]p5: 9143 // The allocation and deallocation functions, operator new, 9144 // operator new[], operator delete and operator delete[], are 9145 // described completely in 3.7.3. The attributes and restrictions 9146 // found in the rest of this subclause do not apply to them unless 9147 // explicitly stated in 3.7.3. 9148 if (Op == OO_Delete || Op == OO_Array_Delete) 9149 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9150 9151 if (Op == OO_New || Op == OO_Array_New) 9152 return CheckOperatorNewDeclaration(*this, FnDecl); 9153 9154 // C++ [over.oper]p6: 9155 // An operator function shall either be a non-static member 9156 // function or be a non-member function and have at least one 9157 // parameter whose type is a class, a reference to a class, an 9158 // enumeration, or a reference to an enumeration. 9159 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9160 if (MethodDecl->isStatic()) 9161 return Diag(FnDecl->getLocation(), 9162 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9163 } else { 9164 bool ClassOrEnumParam = false; 9165 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9166 ParamEnd = FnDecl->param_end(); 9167 Param != ParamEnd; ++Param) { 9168 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9169 if (ParamType->isDependentType() || ParamType->isRecordType() || 9170 ParamType->isEnumeralType()) { 9171 ClassOrEnumParam = true; 9172 break; 9173 } 9174 } 9175 9176 if (!ClassOrEnumParam) 9177 return Diag(FnDecl->getLocation(), 9178 diag::err_operator_overload_needs_class_or_enum) 9179 << FnDecl->getDeclName(); 9180 } 9181 9182 // C++ [over.oper]p8: 9183 // An operator function cannot have default arguments (8.3.6), 9184 // except where explicitly stated below. 9185 // 9186 // Only the function-call operator allows default arguments 9187 // (C++ [over.call]p1). 9188 if (Op != OO_Call) { 9189 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9190 Param != FnDecl->param_end(); ++Param) { 9191 if ((*Param)->hasDefaultArg()) 9192 return Diag((*Param)->getLocation(), 9193 diag::err_operator_overload_default_arg) 9194 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9195 } 9196 } 9197 9198 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9199 { false, false, false } 9200#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9201 , { Unary, Binary, MemberOnly } 9202#include "clang/Basic/OperatorKinds.def" 9203 }; 9204 9205 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9206 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9207 bool MustBeMemberOperator = OperatorUses[Op][2]; 9208 9209 // C++ [over.oper]p8: 9210 // [...] Operator functions cannot have more or fewer parameters 9211 // than the number required for the corresponding operator, as 9212 // described in the rest of this subclause. 9213 unsigned NumParams = FnDecl->getNumParams() 9214 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9215 if (Op != OO_Call && 9216 ((NumParams == 1 && !CanBeUnaryOperator) || 9217 (NumParams == 2 && !CanBeBinaryOperator) || 9218 (NumParams < 1) || (NumParams > 2))) { 9219 // We have the wrong number of parameters. 9220 unsigned ErrorKind; 9221 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9222 ErrorKind = 2; // 2 -> unary or binary. 9223 } else if (CanBeUnaryOperator) { 9224 ErrorKind = 0; // 0 -> unary 9225 } else { 9226 assert(CanBeBinaryOperator && 9227 "All non-call overloaded operators are unary or binary!"); 9228 ErrorKind = 1; // 1 -> binary 9229 } 9230 9231 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9232 << FnDecl->getDeclName() << NumParams << ErrorKind; 9233 } 9234 9235 // Overloaded operators other than operator() cannot be variadic. 9236 if (Op != OO_Call && 9237 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9238 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9239 << FnDecl->getDeclName(); 9240 } 9241 9242 // Some operators must be non-static member functions. 9243 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9244 return Diag(FnDecl->getLocation(), 9245 diag::err_operator_overload_must_be_member) 9246 << FnDecl->getDeclName(); 9247 } 9248 9249 // C++ [over.inc]p1: 9250 // The user-defined function called operator++ implements the 9251 // prefix and postfix ++ operator. If this function is a member 9252 // function with no parameters, or a non-member function with one 9253 // parameter of class or enumeration type, it defines the prefix 9254 // increment operator ++ for objects of that type. If the function 9255 // is a member function with one parameter (which shall be of type 9256 // int) or a non-member function with two parameters (the second 9257 // of which shall be of type int), it defines the postfix 9258 // increment operator ++ for objects of that type. 9259 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9260 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9261 bool ParamIsInt = false; 9262 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9263 ParamIsInt = BT->getKind() == BuiltinType::Int; 9264 9265 if (!ParamIsInt) 9266 return Diag(LastParam->getLocation(), 9267 diag::err_operator_overload_post_incdec_must_be_int) 9268 << LastParam->getType() << (Op == OO_MinusMinus); 9269 } 9270 9271 return false; 9272} 9273 9274/// CheckLiteralOperatorDeclaration - Check whether the declaration 9275/// of this literal operator function is well-formed. If so, returns 9276/// false; otherwise, emits appropriate diagnostics and returns true. 9277bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9278 DeclContext *DC = FnDecl->getDeclContext(); 9279 Decl::Kind Kind = DC->getDeclKind(); 9280 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9281 Kind != Decl::LinkageSpec) { 9282 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9283 << FnDecl->getDeclName(); 9284 return true; 9285 } 9286 9287 bool Valid = false; 9288 9289 // template <char...> type operator "" name() is the only valid template 9290 // signature, and the only valid signature with no parameters. 9291 if (FnDecl->param_size() == 0) { 9292 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9293 // Must have only one template parameter 9294 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9295 if (Params->size() == 1) { 9296 NonTypeTemplateParmDecl *PmDecl = 9297 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9298 9299 // The template parameter must be a char parameter pack. 9300 if (PmDecl && PmDecl->isTemplateParameterPack() && 9301 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9302 Valid = true; 9303 } 9304 } 9305 } else { 9306 // Check the first parameter 9307 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9308 9309 QualType T = (*Param)->getType(); 9310 9311 // unsigned long long int, long double, and any character type are allowed 9312 // as the only parameters. 9313 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9314 Context.hasSameType(T, Context.LongDoubleTy) || 9315 Context.hasSameType(T, Context.CharTy) || 9316 Context.hasSameType(T, Context.WCharTy) || 9317 Context.hasSameType(T, Context.Char16Ty) || 9318 Context.hasSameType(T, Context.Char32Ty)) { 9319 if (++Param == FnDecl->param_end()) 9320 Valid = true; 9321 goto FinishedParams; 9322 } 9323 9324 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9325 const PointerType *PT = T->getAs<PointerType>(); 9326 if (!PT) 9327 goto FinishedParams; 9328 T = PT->getPointeeType(); 9329 if (!T.isConstQualified()) 9330 goto FinishedParams; 9331 T = T.getUnqualifiedType(); 9332 9333 // Move on to the second parameter; 9334 ++Param; 9335 9336 // If there is no second parameter, the first must be a const char * 9337 if (Param == FnDecl->param_end()) { 9338 if (Context.hasSameType(T, Context.CharTy)) 9339 Valid = true; 9340 goto FinishedParams; 9341 } 9342 9343 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9344 // are allowed as the first parameter to a two-parameter function 9345 if (!(Context.hasSameType(T, Context.CharTy) || 9346 Context.hasSameType(T, Context.WCharTy) || 9347 Context.hasSameType(T, Context.Char16Ty) || 9348 Context.hasSameType(T, Context.Char32Ty))) 9349 goto FinishedParams; 9350 9351 // The second and final parameter must be an std::size_t 9352 T = (*Param)->getType().getUnqualifiedType(); 9353 if (Context.hasSameType(T, Context.getSizeType()) && 9354 ++Param == FnDecl->param_end()) 9355 Valid = true; 9356 } 9357 9358 // FIXME: This diagnostic is absolutely terrible. 9359FinishedParams: 9360 if (!Valid) { 9361 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9362 << FnDecl->getDeclName(); 9363 return true; 9364 } 9365 9366 StringRef LiteralName 9367 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9368 if (LiteralName[0] != '_') { 9369 // C++0x [usrlit.suffix]p1: 9370 // Literal suffix identifiers that do not start with an underscore are 9371 // reserved for future standardization. 9372 bool IsHexFloat = true; 9373 if (LiteralName.size() > 1 && 9374 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9375 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9376 if (!isdigit(LiteralName[I])) { 9377 IsHexFloat = false; 9378 break; 9379 } 9380 } 9381 } 9382 9383 if (IsHexFloat) 9384 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9385 << LiteralName; 9386 else 9387 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9388 } 9389 9390 return false; 9391} 9392 9393/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9394/// linkage specification, including the language and (if present) 9395/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9396/// the location of the language string literal, which is provided 9397/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9398/// the '{' brace. Otherwise, this linkage specification does not 9399/// have any braces. 9400Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9401 SourceLocation LangLoc, 9402 StringRef Lang, 9403 SourceLocation LBraceLoc) { 9404 LinkageSpecDecl::LanguageIDs Language; 9405 if (Lang == "\"C\"") 9406 Language = LinkageSpecDecl::lang_c; 9407 else if (Lang == "\"C++\"") 9408 Language = LinkageSpecDecl::lang_cxx; 9409 else { 9410 Diag(LangLoc, diag::err_bad_language); 9411 return 0; 9412 } 9413 9414 // FIXME: Add all the various semantics of linkage specifications 9415 9416 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9417 ExternLoc, LangLoc, Language); 9418 CurContext->addDecl(D); 9419 PushDeclContext(S, D); 9420 return D; 9421} 9422 9423/// ActOnFinishLinkageSpecification - Complete the definition of 9424/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9425/// valid, it's the position of the closing '}' brace in a linkage 9426/// specification that uses braces. 9427Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9428 Decl *LinkageSpec, 9429 SourceLocation RBraceLoc) { 9430 if (LinkageSpec) { 9431 if (RBraceLoc.isValid()) { 9432 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9433 LSDecl->setRBraceLoc(RBraceLoc); 9434 } 9435 PopDeclContext(); 9436 } 9437 return LinkageSpec; 9438} 9439 9440/// \brief Perform semantic analysis for the variable declaration that 9441/// occurs within a C++ catch clause, returning the newly-created 9442/// variable. 9443VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9444 TypeSourceInfo *TInfo, 9445 SourceLocation StartLoc, 9446 SourceLocation Loc, 9447 IdentifierInfo *Name) { 9448 bool Invalid = false; 9449 QualType ExDeclType = TInfo->getType(); 9450 9451 // Arrays and functions decay. 9452 if (ExDeclType->isArrayType()) 9453 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9454 else if (ExDeclType->isFunctionType()) 9455 ExDeclType = Context.getPointerType(ExDeclType); 9456 9457 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9458 // The exception-declaration shall not denote a pointer or reference to an 9459 // incomplete type, other than [cv] void*. 9460 // N2844 forbids rvalue references. 9461 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9462 Diag(Loc, diag::err_catch_rvalue_ref); 9463 Invalid = true; 9464 } 9465 9466 // GCC allows catching pointers and references to incomplete types 9467 // as an extension; so do we, but we warn by default. 9468 9469 QualType BaseType = ExDeclType; 9470 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9471 unsigned DK = diag::err_catch_incomplete; 9472 bool IncompleteCatchIsInvalid = true; 9473 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9474 BaseType = Ptr->getPointeeType(); 9475 Mode = 1; 9476 DK = diag::ext_catch_incomplete_ptr; 9477 IncompleteCatchIsInvalid = false; 9478 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9479 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9480 BaseType = Ref->getPointeeType(); 9481 Mode = 2; 9482 DK = diag::ext_catch_incomplete_ref; 9483 IncompleteCatchIsInvalid = false; 9484 } 9485 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9486 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9487 IncompleteCatchIsInvalid) 9488 Invalid = true; 9489 9490 if (!Invalid && !ExDeclType->isDependentType() && 9491 RequireNonAbstractType(Loc, ExDeclType, 9492 diag::err_abstract_type_in_decl, 9493 AbstractVariableType)) 9494 Invalid = true; 9495 9496 // Only the non-fragile NeXT runtime currently supports C++ catches 9497 // of ObjC types, and no runtime supports catching ObjC types by value. 9498 if (!Invalid && getLangOptions().ObjC1) { 9499 QualType T = ExDeclType; 9500 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9501 T = RT->getPointeeType(); 9502 9503 if (T->isObjCObjectType()) { 9504 Diag(Loc, diag::err_objc_object_catch); 9505 Invalid = true; 9506 } else if (T->isObjCObjectPointerType()) { 9507 if (!getLangOptions().ObjCNonFragileABI) 9508 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9509 } 9510 } 9511 9512 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9513 ExDeclType, TInfo, SC_None, SC_None); 9514 ExDecl->setExceptionVariable(true); 9515 9516 if (!Invalid && !ExDeclType->isDependentType()) { 9517 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9518 // C++ [except.handle]p16: 9519 // The object declared in an exception-declaration or, if the 9520 // exception-declaration does not specify a name, a temporary (12.2) is 9521 // copy-initialized (8.5) from the exception object. [...] 9522 // The object is destroyed when the handler exits, after the destruction 9523 // of any automatic objects initialized within the handler. 9524 // 9525 // We just pretend to initialize the object with itself, then make sure 9526 // it can be destroyed later. 9527 QualType initType = ExDeclType; 9528 9529 InitializedEntity entity = 9530 InitializedEntity::InitializeVariable(ExDecl); 9531 InitializationKind initKind = 9532 InitializationKind::CreateCopy(Loc, SourceLocation()); 9533 9534 Expr *opaqueValue = 9535 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9536 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9537 ExprResult result = sequence.Perform(*this, entity, initKind, 9538 MultiExprArg(&opaqueValue, 1)); 9539 if (result.isInvalid()) 9540 Invalid = true; 9541 else { 9542 // If the constructor used was non-trivial, set this as the 9543 // "initializer". 9544 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9545 if (!construct->getConstructor()->isTrivial()) { 9546 Expr *init = MaybeCreateExprWithCleanups(construct); 9547 ExDecl->setInit(init); 9548 } 9549 9550 // And make sure it's destructable. 9551 FinalizeVarWithDestructor(ExDecl, recordType); 9552 } 9553 } 9554 } 9555 9556 if (Invalid) 9557 ExDecl->setInvalidDecl(); 9558 9559 return ExDecl; 9560} 9561 9562/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9563/// handler. 9564Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9565 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9566 bool Invalid = D.isInvalidType(); 9567 9568 // Check for unexpanded parameter packs. 9569 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9570 UPPC_ExceptionType)) { 9571 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9572 D.getIdentifierLoc()); 9573 Invalid = true; 9574 } 9575 9576 IdentifierInfo *II = D.getIdentifier(); 9577 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9578 LookupOrdinaryName, 9579 ForRedeclaration)) { 9580 // The scope should be freshly made just for us. There is just no way 9581 // it contains any previous declaration. 9582 assert(!S->isDeclScope(PrevDecl)); 9583 if (PrevDecl->isTemplateParameter()) { 9584 // Maybe we will complain about the shadowed template parameter. 9585 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9586 PrevDecl = 0; 9587 } 9588 } 9589 9590 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9591 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9592 << D.getCXXScopeSpec().getRange(); 9593 Invalid = true; 9594 } 9595 9596 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9597 D.getSourceRange().getBegin(), 9598 D.getIdentifierLoc(), 9599 D.getIdentifier()); 9600 if (Invalid) 9601 ExDecl->setInvalidDecl(); 9602 9603 // Add the exception declaration into this scope. 9604 if (II) 9605 PushOnScopeChains(ExDecl, S); 9606 else 9607 CurContext->addDecl(ExDecl); 9608 9609 ProcessDeclAttributes(S, ExDecl, D); 9610 return ExDecl; 9611} 9612 9613Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9614 Expr *AssertExpr, 9615 Expr *AssertMessageExpr_, 9616 SourceLocation RParenLoc) { 9617 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9618 9619 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9620 llvm::APSInt Value(32); 9621 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9622 Diag(StaticAssertLoc, 9623 diag::err_static_assert_expression_is_not_constant) << 9624 AssertExpr->getSourceRange(); 9625 return 0; 9626 } 9627 9628 if (Value == 0) { 9629 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9630 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9631 } 9632 } 9633 9634 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9635 return 0; 9636 9637 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9638 AssertExpr, AssertMessage, RParenLoc); 9639 9640 CurContext->addDecl(Decl); 9641 return Decl; 9642} 9643 9644/// \brief Perform semantic analysis of the given friend type declaration. 9645/// 9646/// \returns A friend declaration that. 9647FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9648 TypeSourceInfo *TSInfo) { 9649 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9650 9651 QualType T = TSInfo->getType(); 9652 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9653 9654 // C++03 [class.friend]p2: 9655 // An elaborated-type-specifier shall be used in a friend declaration 9656 // for a class.* 9657 // 9658 // * The class-key of the elaborated-type-specifier is required. 9659 if (!ActiveTemplateInstantiations.empty()) { 9660 // Do not complain about the form of friend template types during 9661 // template instantiation; we will already have complained when the 9662 // template was declared. 9663 } else if (!T->isElaboratedTypeSpecifier()) { 9664 // If we evaluated the type to a record type, suggest putting 9665 // a tag in front. 9666 if (const RecordType *RT = T->getAs<RecordType>()) { 9667 RecordDecl *RD = RT->getDecl(); 9668 9669 std::string InsertionText = std::string(" ") + RD->getKindName(); 9670 9671 Diag(TypeRange.getBegin(), 9672 getLangOptions().CPlusPlus0x ? 9673 diag::warn_cxx98_compat_unelaborated_friend_type : 9674 diag::ext_unelaborated_friend_type) 9675 << (unsigned) RD->getTagKind() 9676 << T 9677 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9678 InsertionText); 9679 } else { 9680 Diag(FriendLoc, 9681 getLangOptions().CPlusPlus0x ? 9682 diag::warn_cxx98_compat_nonclass_type_friend : 9683 diag::ext_nonclass_type_friend) 9684 << T 9685 << SourceRange(FriendLoc, TypeRange.getEnd()); 9686 } 9687 } else if (T->getAs<EnumType>()) { 9688 Diag(FriendLoc, 9689 getLangOptions().CPlusPlus0x ? 9690 diag::warn_cxx98_compat_enum_friend : 9691 diag::ext_enum_friend) 9692 << T 9693 << SourceRange(FriendLoc, TypeRange.getEnd()); 9694 } 9695 9696 // C++0x [class.friend]p3: 9697 // If the type specifier in a friend declaration designates a (possibly 9698 // cv-qualified) class type, that class is declared as a friend; otherwise, 9699 // the friend declaration is ignored. 9700 9701 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9702 // in [class.friend]p3 that we do not implement. 9703 9704 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9705} 9706 9707/// Handle a friend tag declaration where the scope specifier was 9708/// templated. 9709Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9710 unsigned TagSpec, SourceLocation TagLoc, 9711 CXXScopeSpec &SS, 9712 IdentifierInfo *Name, SourceLocation NameLoc, 9713 AttributeList *Attr, 9714 MultiTemplateParamsArg TempParamLists) { 9715 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9716 9717 bool isExplicitSpecialization = false; 9718 bool Invalid = false; 9719 9720 if (TemplateParameterList *TemplateParams 9721 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9722 TempParamLists.get(), 9723 TempParamLists.size(), 9724 /*friend*/ true, 9725 isExplicitSpecialization, 9726 Invalid)) { 9727 if (TemplateParams->size() > 0) { 9728 // This is a declaration of a class template. 9729 if (Invalid) 9730 return 0; 9731 9732 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9733 SS, Name, NameLoc, Attr, 9734 TemplateParams, AS_public, 9735 /*ModulePrivateLoc=*/SourceLocation(), 9736 TempParamLists.size() - 1, 9737 (TemplateParameterList**) TempParamLists.release()).take(); 9738 } else { 9739 // The "template<>" header is extraneous. 9740 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9741 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9742 isExplicitSpecialization = true; 9743 } 9744 } 9745 9746 if (Invalid) return 0; 9747 9748 bool isAllExplicitSpecializations = true; 9749 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9750 if (TempParamLists.get()[I]->size()) { 9751 isAllExplicitSpecializations = false; 9752 break; 9753 } 9754 } 9755 9756 // FIXME: don't ignore attributes. 9757 9758 // If it's explicit specializations all the way down, just forget 9759 // about the template header and build an appropriate non-templated 9760 // friend. TODO: for source fidelity, remember the headers. 9761 if (isAllExplicitSpecializations) { 9762 if (SS.isEmpty()) { 9763 bool Owned = false; 9764 bool IsDependent = false; 9765 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9766 Attr, AS_public, 9767 /*ModulePrivateLoc=*/SourceLocation(), 9768 MultiTemplateParamsArg(), Owned, IsDependent, 9769 /*ScopedEnum=*/false, 9770 /*ScopedEnumUsesClassTag=*/false, 9771 /*UnderlyingType=*/TypeResult()); 9772 } 9773 9774 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9775 ElaboratedTypeKeyword Keyword 9776 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9777 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9778 *Name, NameLoc); 9779 if (T.isNull()) 9780 return 0; 9781 9782 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9783 if (isa<DependentNameType>(T)) { 9784 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9785 TL.setKeywordLoc(TagLoc); 9786 TL.setQualifierLoc(QualifierLoc); 9787 TL.setNameLoc(NameLoc); 9788 } else { 9789 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9790 TL.setKeywordLoc(TagLoc); 9791 TL.setQualifierLoc(QualifierLoc); 9792 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9793 } 9794 9795 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9796 TSI, FriendLoc); 9797 Friend->setAccess(AS_public); 9798 CurContext->addDecl(Friend); 9799 return Friend; 9800 } 9801 9802 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9803 9804 9805 9806 // Handle the case of a templated-scope friend class. e.g. 9807 // template <class T> class A<T>::B; 9808 // FIXME: we don't support these right now. 9809 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9810 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9811 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9812 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9813 TL.setKeywordLoc(TagLoc); 9814 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9815 TL.setNameLoc(NameLoc); 9816 9817 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9818 TSI, FriendLoc); 9819 Friend->setAccess(AS_public); 9820 Friend->setUnsupportedFriend(true); 9821 CurContext->addDecl(Friend); 9822 return Friend; 9823} 9824 9825 9826/// Handle a friend type declaration. This works in tandem with 9827/// ActOnTag. 9828/// 9829/// Notes on friend class templates: 9830/// 9831/// We generally treat friend class declarations as if they were 9832/// declaring a class. So, for example, the elaborated type specifier 9833/// in a friend declaration is required to obey the restrictions of a 9834/// class-head (i.e. no typedefs in the scope chain), template 9835/// parameters are required to match up with simple template-ids, &c. 9836/// However, unlike when declaring a template specialization, it's 9837/// okay to refer to a template specialization without an empty 9838/// template parameter declaration, e.g. 9839/// friend class A<T>::B<unsigned>; 9840/// We permit this as a special case; if there are any template 9841/// parameters present at all, require proper matching, i.e. 9842/// template <> template <class T> friend class A<int>::B; 9843Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9844 MultiTemplateParamsArg TempParams) { 9845 SourceLocation Loc = DS.getSourceRange().getBegin(); 9846 9847 assert(DS.isFriendSpecified()); 9848 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9849 9850 // Try to convert the decl specifier to a type. This works for 9851 // friend templates because ActOnTag never produces a ClassTemplateDecl 9852 // for a TUK_Friend. 9853 Declarator TheDeclarator(DS, Declarator::MemberContext); 9854 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9855 QualType T = TSI->getType(); 9856 if (TheDeclarator.isInvalidType()) 9857 return 0; 9858 9859 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9860 return 0; 9861 9862 // This is definitely an error in C++98. It's probably meant to 9863 // be forbidden in C++0x, too, but the specification is just 9864 // poorly written. 9865 // 9866 // The problem is with declarations like the following: 9867 // template <T> friend A<T>::foo; 9868 // where deciding whether a class C is a friend or not now hinges 9869 // on whether there exists an instantiation of A that causes 9870 // 'foo' to equal C. There are restrictions on class-heads 9871 // (which we declare (by fiat) elaborated friend declarations to 9872 // be) that makes this tractable. 9873 // 9874 // FIXME: handle "template <> friend class A<T>;", which 9875 // is possibly well-formed? Who even knows? 9876 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9877 Diag(Loc, diag::err_tagless_friend_type_template) 9878 << DS.getSourceRange(); 9879 return 0; 9880 } 9881 9882 // C++98 [class.friend]p1: A friend of a class is a function 9883 // or class that is not a member of the class . . . 9884 // This is fixed in DR77, which just barely didn't make the C++03 9885 // deadline. It's also a very silly restriction that seriously 9886 // affects inner classes and which nobody else seems to implement; 9887 // thus we never diagnose it, not even in -pedantic. 9888 // 9889 // But note that we could warn about it: it's always useless to 9890 // friend one of your own members (it's not, however, worthless to 9891 // friend a member of an arbitrary specialization of your template). 9892 9893 Decl *D; 9894 if (unsigned NumTempParamLists = TempParams.size()) 9895 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9896 NumTempParamLists, 9897 TempParams.release(), 9898 TSI, 9899 DS.getFriendSpecLoc()); 9900 else 9901 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9902 9903 if (!D) 9904 return 0; 9905 9906 D->setAccess(AS_public); 9907 CurContext->addDecl(D); 9908 9909 return D; 9910} 9911 9912Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9913 MultiTemplateParamsArg TemplateParams) { 9914 const DeclSpec &DS = D.getDeclSpec(); 9915 9916 assert(DS.isFriendSpecified()); 9917 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9918 9919 SourceLocation Loc = D.getIdentifierLoc(); 9920 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9921 9922 // C++ [class.friend]p1 9923 // A friend of a class is a function or class.... 9924 // Note that this sees through typedefs, which is intended. 9925 // It *doesn't* see through dependent types, which is correct 9926 // according to [temp.arg.type]p3: 9927 // If a declaration acquires a function type through a 9928 // type dependent on a template-parameter and this causes 9929 // a declaration that does not use the syntactic form of a 9930 // function declarator to have a function type, the program 9931 // is ill-formed. 9932 if (!TInfo->getType()->isFunctionType()) { 9933 Diag(Loc, diag::err_unexpected_friend); 9934 9935 // It might be worthwhile to try to recover by creating an 9936 // appropriate declaration. 9937 return 0; 9938 } 9939 9940 // C++ [namespace.memdef]p3 9941 // - If a friend declaration in a non-local class first declares a 9942 // class or function, the friend class or function is a member 9943 // of the innermost enclosing namespace. 9944 // - The name of the friend is not found by simple name lookup 9945 // until a matching declaration is provided in that namespace 9946 // scope (either before or after the class declaration granting 9947 // friendship). 9948 // - If a friend function is called, its name may be found by the 9949 // name lookup that considers functions from namespaces and 9950 // classes associated with the types of the function arguments. 9951 // - When looking for a prior declaration of a class or a function 9952 // declared as a friend, scopes outside the innermost enclosing 9953 // namespace scope are not considered. 9954 9955 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9956 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9957 DeclarationName Name = NameInfo.getName(); 9958 assert(Name); 9959 9960 // Check for unexpanded parameter packs. 9961 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9962 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9963 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9964 return 0; 9965 9966 // The context we found the declaration in, or in which we should 9967 // create the declaration. 9968 DeclContext *DC; 9969 Scope *DCScope = S; 9970 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9971 ForRedeclaration); 9972 9973 // FIXME: there are different rules in local classes 9974 9975 // There are four cases here. 9976 // - There's no scope specifier, in which case we just go to the 9977 // appropriate scope and look for a function or function template 9978 // there as appropriate. 9979 // Recover from invalid scope qualifiers as if they just weren't there. 9980 if (SS.isInvalid() || !SS.isSet()) { 9981 // C++0x [namespace.memdef]p3: 9982 // If the name in a friend declaration is neither qualified nor 9983 // a template-id and the declaration is a function or an 9984 // elaborated-type-specifier, the lookup to determine whether 9985 // the entity has been previously declared shall not consider 9986 // any scopes outside the innermost enclosing namespace. 9987 // C++0x [class.friend]p11: 9988 // If a friend declaration appears in a local class and the name 9989 // specified is an unqualified name, a prior declaration is 9990 // looked up without considering scopes that are outside the 9991 // innermost enclosing non-class scope. For a friend function 9992 // declaration, if there is no prior declaration, the program is 9993 // ill-formed. 9994 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9995 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9996 9997 // Find the appropriate context according to the above. 9998 DC = CurContext; 9999 while (true) { 10000 // Skip class contexts. If someone can cite chapter and verse 10001 // for this behavior, that would be nice --- it's what GCC and 10002 // EDG do, and it seems like a reasonable intent, but the spec 10003 // really only says that checks for unqualified existing 10004 // declarations should stop at the nearest enclosing namespace, 10005 // not that they should only consider the nearest enclosing 10006 // namespace. 10007 while (DC->isRecord()) 10008 DC = DC->getParent(); 10009 10010 LookupQualifiedName(Previous, DC); 10011 10012 // TODO: decide what we think about using declarations. 10013 if (isLocal || !Previous.empty()) 10014 break; 10015 10016 if (isTemplateId) { 10017 if (isa<TranslationUnitDecl>(DC)) break; 10018 } else { 10019 if (DC->isFileContext()) break; 10020 } 10021 DC = DC->getParent(); 10022 } 10023 10024 // C++ [class.friend]p1: A friend of a class is a function or 10025 // class that is not a member of the class . . . 10026 // C++11 changes this for both friend types and functions. 10027 // Most C++ 98 compilers do seem to give an error here, so 10028 // we do, too. 10029 if (!Previous.empty() && DC->Equals(CurContext)) 10030 Diag(DS.getFriendSpecLoc(), 10031 getLangOptions().CPlusPlus0x ? 10032 diag::warn_cxx98_compat_friend_is_member : 10033 diag::err_friend_is_member); 10034 10035 DCScope = getScopeForDeclContext(S, DC); 10036 10037 // C++ [class.friend]p6: 10038 // A function can be defined in a friend declaration of a class if and 10039 // only if the class is a non-local class (9.8), the function name is 10040 // unqualified, and the function has namespace scope. 10041 if (isLocal && D.isFunctionDefinition()) { 10042 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10043 } 10044 10045 // - There's a non-dependent scope specifier, in which case we 10046 // compute it and do a previous lookup there for a function 10047 // or function template. 10048 } else if (!SS.getScopeRep()->isDependent()) { 10049 DC = computeDeclContext(SS); 10050 if (!DC) return 0; 10051 10052 if (RequireCompleteDeclContext(SS, DC)) return 0; 10053 10054 LookupQualifiedName(Previous, DC); 10055 10056 // Ignore things found implicitly in the wrong scope. 10057 // TODO: better diagnostics for this case. Suggesting the right 10058 // qualified scope would be nice... 10059 LookupResult::Filter F = Previous.makeFilter(); 10060 while (F.hasNext()) { 10061 NamedDecl *D = F.next(); 10062 if (!DC->InEnclosingNamespaceSetOf( 10063 D->getDeclContext()->getRedeclContext())) 10064 F.erase(); 10065 } 10066 F.done(); 10067 10068 if (Previous.empty()) { 10069 D.setInvalidType(); 10070 Diag(Loc, diag::err_qualified_friend_not_found) 10071 << Name << TInfo->getType(); 10072 return 0; 10073 } 10074 10075 // C++ [class.friend]p1: A friend of a class is a function or 10076 // class that is not a member of the class . . . 10077 if (DC->Equals(CurContext)) 10078 Diag(DS.getFriendSpecLoc(), 10079 getLangOptions().CPlusPlus0x ? 10080 diag::warn_cxx98_compat_friend_is_member : 10081 diag::err_friend_is_member); 10082 10083 if (D.isFunctionDefinition()) { 10084 // C++ [class.friend]p6: 10085 // A function can be defined in a friend declaration of a class if and 10086 // only if the class is a non-local class (9.8), the function name is 10087 // unqualified, and the function has namespace scope. 10088 SemaDiagnosticBuilder DB 10089 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10090 10091 DB << SS.getScopeRep(); 10092 if (DC->isFileContext()) 10093 DB << FixItHint::CreateRemoval(SS.getRange()); 10094 SS.clear(); 10095 } 10096 10097 // - There's a scope specifier that does not match any template 10098 // parameter lists, in which case we use some arbitrary context, 10099 // create a method or method template, and wait for instantiation. 10100 // - There's a scope specifier that does match some template 10101 // parameter lists, which we don't handle right now. 10102 } else { 10103 if (D.isFunctionDefinition()) { 10104 // C++ [class.friend]p6: 10105 // A function can be defined in a friend declaration of a class if and 10106 // only if the class is a non-local class (9.8), the function name is 10107 // unqualified, and the function has namespace scope. 10108 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10109 << SS.getScopeRep(); 10110 } 10111 10112 DC = CurContext; 10113 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10114 } 10115 10116 if (!DC->isRecord()) { 10117 // This implies that it has to be an operator or function. 10118 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10119 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10120 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10121 Diag(Loc, diag::err_introducing_special_friend) << 10122 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10123 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10124 return 0; 10125 } 10126 } 10127 10128 bool AddToScope = true; 10129 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10130 move(TemplateParams), AddToScope); 10131 if (!ND) return 0; 10132 10133 assert(ND->getDeclContext() == DC); 10134 assert(ND->getLexicalDeclContext() == CurContext); 10135 10136 // Add the function declaration to the appropriate lookup tables, 10137 // adjusting the redeclarations list as necessary. We don't 10138 // want to do this yet if the friending class is dependent. 10139 // 10140 // Also update the scope-based lookup if the target context's 10141 // lookup context is in lexical scope. 10142 if (!CurContext->isDependentContext()) { 10143 DC = DC->getRedeclContext(); 10144 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10145 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10146 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10147 } 10148 10149 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10150 D.getIdentifierLoc(), ND, 10151 DS.getFriendSpecLoc()); 10152 FrD->setAccess(AS_public); 10153 CurContext->addDecl(FrD); 10154 10155 if (ND->isInvalidDecl()) 10156 FrD->setInvalidDecl(); 10157 else { 10158 FunctionDecl *FD; 10159 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10160 FD = FTD->getTemplatedDecl(); 10161 else 10162 FD = cast<FunctionDecl>(ND); 10163 10164 // Mark templated-scope function declarations as unsupported. 10165 if (FD->getNumTemplateParameterLists()) 10166 FrD->setUnsupportedFriend(true); 10167 } 10168 10169 return ND; 10170} 10171 10172void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10173 AdjustDeclIfTemplate(Dcl); 10174 10175 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10176 if (!Fn) { 10177 Diag(DelLoc, diag::err_deleted_non_function); 10178 return; 10179 } 10180 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10181 Diag(DelLoc, diag::err_deleted_decl_not_first); 10182 Diag(Prev->getLocation(), diag::note_previous_declaration); 10183 // If the declaration wasn't the first, we delete the function anyway for 10184 // recovery. 10185 } 10186 Fn->setDeletedAsWritten(); 10187} 10188 10189void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10190 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10191 10192 if (MD) { 10193 if (MD->getParent()->isDependentType()) { 10194 MD->setDefaulted(); 10195 MD->setExplicitlyDefaulted(); 10196 return; 10197 } 10198 10199 CXXSpecialMember Member = getSpecialMember(MD); 10200 if (Member == CXXInvalid) { 10201 Diag(DefaultLoc, diag::err_default_special_members); 10202 return; 10203 } 10204 10205 MD->setDefaulted(); 10206 MD->setExplicitlyDefaulted(); 10207 10208 // If this definition appears within the record, do the checking when 10209 // the record is complete. 10210 const FunctionDecl *Primary = MD; 10211 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10212 // Find the uninstantiated declaration that actually had the '= default' 10213 // on it. 10214 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10215 10216 if (Primary == Primary->getCanonicalDecl()) 10217 return; 10218 10219 switch (Member) { 10220 case CXXDefaultConstructor: { 10221 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10222 CheckExplicitlyDefaultedDefaultConstructor(CD); 10223 if (!CD->isInvalidDecl()) 10224 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10225 break; 10226 } 10227 10228 case CXXCopyConstructor: { 10229 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10230 CheckExplicitlyDefaultedCopyConstructor(CD); 10231 if (!CD->isInvalidDecl()) 10232 DefineImplicitCopyConstructor(DefaultLoc, CD); 10233 break; 10234 } 10235 10236 case CXXCopyAssignment: { 10237 CheckExplicitlyDefaultedCopyAssignment(MD); 10238 if (!MD->isInvalidDecl()) 10239 DefineImplicitCopyAssignment(DefaultLoc, MD); 10240 break; 10241 } 10242 10243 case CXXDestructor: { 10244 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10245 CheckExplicitlyDefaultedDestructor(DD); 10246 if (!DD->isInvalidDecl()) 10247 DefineImplicitDestructor(DefaultLoc, DD); 10248 break; 10249 } 10250 10251 case CXXMoveConstructor: { 10252 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10253 CheckExplicitlyDefaultedMoveConstructor(CD); 10254 if (!CD->isInvalidDecl()) 10255 DefineImplicitMoveConstructor(DefaultLoc, CD); 10256 break; 10257 } 10258 10259 case CXXMoveAssignment: { 10260 CheckExplicitlyDefaultedMoveAssignment(MD); 10261 if (!MD->isInvalidDecl()) 10262 DefineImplicitMoveAssignment(DefaultLoc, MD); 10263 break; 10264 } 10265 10266 case CXXInvalid: 10267 llvm_unreachable("Invalid special member."); 10268 } 10269 } else { 10270 Diag(DefaultLoc, diag::err_default_special_members); 10271 } 10272} 10273 10274static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10275 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10276 Stmt *SubStmt = *CI; 10277 if (!SubStmt) 10278 continue; 10279 if (isa<ReturnStmt>(SubStmt)) 10280 Self.Diag(SubStmt->getSourceRange().getBegin(), 10281 diag::err_return_in_constructor_handler); 10282 if (!isa<Expr>(SubStmt)) 10283 SearchForReturnInStmt(Self, SubStmt); 10284 } 10285} 10286 10287void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10288 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10289 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10290 SearchForReturnInStmt(*this, Handler); 10291 } 10292} 10293 10294bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10295 const CXXMethodDecl *Old) { 10296 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10297 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10298 10299 if (Context.hasSameType(NewTy, OldTy) || 10300 NewTy->isDependentType() || OldTy->isDependentType()) 10301 return false; 10302 10303 // Check if the return types are covariant 10304 QualType NewClassTy, OldClassTy; 10305 10306 /// Both types must be pointers or references to classes. 10307 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10308 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10309 NewClassTy = NewPT->getPointeeType(); 10310 OldClassTy = OldPT->getPointeeType(); 10311 } 10312 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10313 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10314 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10315 NewClassTy = NewRT->getPointeeType(); 10316 OldClassTy = OldRT->getPointeeType(); 10317 } 10318 } 10319 } 10320 10321 // The return types aren't either both pointers or references to a class type. 10322 if (NewClassTy.isNull()) { 10323 Diag(New->getLocation(), 10324 diag::err_different_return_type_for_overriding_virtual_function) 10325 << New->getDeclName() << NewTy << OldTy; 10326 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10327 10328 return true; 10329 } 10330 10331 // C++ [class.virtual]p6: 10332 // If the return type of D::f differs from the return type of B::f, the 10333 // class type in the return type of D::f shall be complete at the point of 10334 // declaration of D::f or shall be the class type D. 10335 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10336 if (!RT->isBeingDefined() && 10337 RequireCompleteType(New->getLocation(), NewClassTy, 10338 PDiag(diag::err_covariant_return_incomplete) 10339 << New->getDeclName())) 10340 return true; 10341 } 10342 10343 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10344 // Check if the new class derives from the old class. 10345 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10346 Diag(New->getLocation(), 10347 diag::err_covariant_return_not_derived) 10348 << New->getDeclName() << NewTy << OldTy; 10349 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10350 return true; 10351 } 10352 10353 // Check if we the conversion from derived to base is valid. 10354 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10355 diag::err_covariant_return_inaccessible_base, 10356 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10357 // FIXME: Should this point to the return type? 10358 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10359 // FIXME: this note won't trigger for delayed access control 10360 // diagnostics, and it's impossible to get an undelayed error 10361 // here from access control during the original parse because 10362 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10363 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10364 return true; 10365 } 10366 } 10367 10368 // The qualifiers of the return types must be the same. 10369 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10370 Diag(New->getLocation(), 10371 diag::err_covariant_return_type_different_qualifications) 10372 << New->getDeclName() << NewTy << OldTy; 10373 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10374 return true; 10375 }; 10376 10377 10378 // The new class type must have the same or less qualifiers as the old type. 10379 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10380 Diag(New->getLocation(), 10381 diag::err_covariant_return_type_class_type_more_qualified) 10382 << New->getDeclName() << NewTy << OldTy; 10383 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10384 return true; 10385 }; 10386 10387 return false; 10388} 10389 10390/// \brief Mark the given method pure. 10391/// 10392/// \param Method the method to be marked pure. 10393/// 10394/// \param InitRange the source range that covers the "0" initializer. 10395bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10396 SourceLocation EndLoc = InitRange.getEnd(); 10397 if (EndLoc.isValid()) 10398 Method->setRangeEnd(EndLoc); 10399 10400 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10401 Method->setPure(); 10402 return false; 10403 } 10404 10405 if (!Method->isInvalidDecl()) 10406 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10407 << Method->getDeclName() << InitRange; 10408 return true; 10409} 10410 10411/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10412/// an initializer for the out-of-line declaration 'Dcl'. The scope 10413/// is a fresh scope pushed for just this purpose. 10414/// 10415/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10416/// static data member of class X, names should be looked up in the scope of 10417/// class X. 10418void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10419 // If there is no declaration, there was an error parsing it. 10420 if (D == 0 || D->isInvalidDecl()) return; 10421 10422 // We should only get called for declarations with scope specifiers, like: 10423 // int foo::bar; 10424 assert(D->isOutOfLine()); 10425 EnterDeclaratorContext(S, D->getDeclContext()); 10426} 10427 10428/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10429/// initializer for the out-of-line declaration 'D'. 10430void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10431 // If there is no declaration, there was an error parsing it. 10432 if (D == 0 || D->isInvalidDecl()) return; 10433 10434 assert(D->isOutOfLine()); 10435 ExitDeclaratorContext(S); 10436} 10437 10438/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10439/// C++ if/switch/while/for statement. 10440/// e.g: "if (int x = f()) {...}" 10441DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10442 // C++ 6.4p2: 10443 // The declarator shall not specify a function or an array. 10444 // The type-specifier-seq shall not contain typedef and shall not declare a 10445 // new class or enumeration. 10446 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10447 "Parser allowed 'typedef' as storage class of condition decl."); 10448 10449 Decl *Dcl = ActOnDeclarator(S, D); 10450 if (!Dcl) 10451 return true; 10452 10453 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10454 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10455 << D.getSourceRange(); 10456 return true; 10457 } 10458 10459 return Dcl; 10460} 10461 10462void Sema::LoadExternalVTableUses() { 10463 if (!ExternalSource) 10464 return; 10465 10466 SmallVector<ExternalVTableUse, 4> VTables; 10467 ExternalSource->ReadUsedVTables(VTables); 10468 SmallVector<VTableUse, 4> NewUses; 10469 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10470 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10471 = VTablesUsed.find(VTables[I].Record); 10472 // Even if a definition wasn't required before, it may be required now. 10473 if (Pos != VTablesUsed.end()) { 10474 if (!Pos->second && VTables[I].DefinitionRequired) 10475 Pos->second = true; 10476 continue; 10477 } 10478 10479 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10480 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10481 } 10482 10483 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10484} 10485 10486void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10487 bool DefinitionRequired) { 10488 // Ignore any vtable uses in unevaluated operands or for classes that do 10489 // not have a vtable. 10490 if (!Class->isDynamicClass() || Class->isDependentContext() || 10491 CurContext->isDependentContext() || 10492 ExprEvalContexts.back().Context == Unevaluated) 10493 return; 10494 10495 // Try to insert this class into the map. 10496 LoadExternalVTableUses(); 10497 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10498 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10499 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10500 if (!Pos.second) { 10501 // If we already had an entry, check to see if we are promoting this vtable 10502 // to required a definition. If so, we need to reappend to the VTableUses 10503 // list, since we may have already processed the first entry. 10504 if (DefinitionRequired && !Pos.first->second) { 10505 Pos.first->second = true; 10506 } else { 10507 // Otherwise, we can early exit. 10508 return; 10509 } 10510 } 10511 10512 // Local classes need to have their virtual members marked 10513 // immediately. For all other classes, we mark their virtual members 10514 // at the end of the translation unit. 10515 if (Class->isLocalClass()) 10516 MarkVirtualMembersReferenced(Loc, Class); 10517 else 10518 VTableUses.push_back(std::make_pair(Class, Loc)); 10519} 10520 10521bool Sema::DefineUsedVTables() { 10522 LoadExternalVTableUses(); 10523 if (VTableUses.empty()) 10524 return false; 10525 10526 // Note: The VTableUses vector could grow as a result of marking 10527 // the members of a class as "used", so we check the size each 10528 // time through the loop and prefer indices (with are stable) to 10529 // iterators (which are not). 10530 bool DefinedAnything = false; 10531 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10532 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10533 if (!Class) 10534 continue; 10535 10536 SourceLocation Loc = VTableUses[I].second; 10537 10538 // If this class has a key function, but that key function is 10539 // defined in another translation unit, we don't need to emit the 10540 // vtable even though we're using it. 10541 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10542 if (KeyFunction && !KeyFunction->hasBody()) { 10543 switch (KeyFunction->getTemplateSpecializationKind()) { 10544 case TSK_Undeclared: 10545 case TSK_ExplicitSpecialization: 10546 case TSK_ExplicitInstantiationDeclaration: 10547 // The key function is in another translation unit. 10548 continue; 10549 10550 case TSK_ExplicitInstantiationDefinition: 10551 case TSK_ImplicitInstantiation: 10552 // We will be instantiating the key function. 10553 break; 10554 } 10555 } else if (!KeyFunction) { 10556 // If we have a class with no key function that is the subject 10557 // of an explicit instantiation declaration, suppress the 10558 // vtable; it will live with the explicit instantiation 10559 // definition. 10560 bool IsExplicitInstantiationDeclaration 10561 = Class->getTemplateSpecializationKind() 10562 == TSK_ExplicitInstantiationDeclaration; 10563 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10564 REnd = Class->redecls_end(); 10565 R != REnd; ++R) { 10566 TemplateSpecializationKind TSK 10567 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10568 if (TSK == TSK_ExplicitInstantiationDeclaration) 10569 IsExplicitInstantiationDeclaration = true; 10570 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10571 IsExplicitInstantiationDeclaration = false; 10572 break; 10573 } 10574 } 10575 10576 if (IsExplicitInstantiationDeclaration) 10577 continue; 10578 } 10579 10580 // Mark all of the virtual members of this class as referenced, so 10581 // that we can build a vtable. Then, tell the AST consumer that a 10582 // vtable for this class is required. 10583 DefinedAnything = true; 10584 MarkVirtualMembersReferenced(Loc, Class); 10585 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10586 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10587 10588 // Optionally warn if we're emitting a weak vtable. 10589 if (Class->getLinkage() == ExternalLinkage && 10590 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10591 const FunctionDecl *KeyFunctionDef = 0; 10592 if (!KeyFunction || 10593 (KeyFunction->hasBody(KeyFunctionDef) && 10594 KeyFunctionDef->isInlined())) 10595 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10596 } 10597 } 10598 VTableUses.clear(); 10599 10600 return DefinedAnything; 10601} 10602 10603void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10604 const CXXRecordDecl *RD) { 10605 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10606 e = RD->method_end(); i != e; ++i) { 10607 CXXMethodDecl *MD = *i; 10608 10609 // C++ [basic.def.odr]p2: 10610 // [...] A virtual member function is used if it is not pure. [...] 10611 if (MD->isVirtual() && !MD->isPure()) 10612 MarkDeclarationReferenced(Loc, MD); 10613 } 10614 10615 // Only classes that have virtual bases need a VTT. 10616 if (RD->getNumVBases() == 0) 10617 return; 10618 10619 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10620 e = RD->bases_end(); i != e; ++i) { 10621 const CXXRecordDecl *Base = 10622 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10623 if (Base->getNumVBases() == 0) 10624 continue; 10625 MarkVirtualMembersReferenced(Loc, Base); 10626 } 10627} 10628 10629/// SetIvarInitializers - This routine builds initialization ASTs for the 10630/// Objective-C implementation whose ivars need be initialized. 10631void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10632 if (!getLangOptions().CPlusPlus) 10633 return; 10634 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10635 SmallVector<ObjCIvarDecl*, 8> ivars; 10636 CollectIvarsToConstructOrDestruct(OID, ivars); 10637 if (ivars.empty()) 10638 return; 10639 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10640 for (unsigned i = 0; i < ivars.size(); i++) { 10641 FieldDecl *Field = ivars[i]; 10642 if (Field->isInvalidDecl()) 10643 continue; 10644 10645 CXXCtorInitializer *Member; 10646 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10647 InitializationKind InitKind = 10648 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10649 10650 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10651 ExprResult MemberInit = 10652 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10653 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10654 // Note, MemberInit could actually come back empty if no initialization 10655 // is required (e.g., because it would call a trivial default constructor) 10656 if (!MemberInit.get() || MemberInit.isInvalid()) 10657 continue; 10658 10659 Member = 10660 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10661 SourceLocation(), 10662 MemberInit.takeAs<Expr>(), 10663 SourceLocation()); 10664 AllToInit.push_back(Member); 10665 10666 // Be sure that the destructor is accessible and is marked as referenced. 10667 if (const RecordType *RecordTy 10668 = Context.getBaseElementType(Field->getType()) 10669 ->getAs<RecordType>()) { 10670 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10671 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10672 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10673 CheckDestructorAccess(Field->getLocation(), Destructor, 10674 PDiag(diag::err_access_dtor_ivar) 10675 << Context.getBaseElementType(Field->getType())); 10676 } 10677 } 10678 } 10679 ObjCImplementation->setIvarInitializers(Context, 10680 AllToInit.data(), AllToInit.size()); 10681 } 10682} 10683 10684static 10685void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10686 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10687 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10688 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10689 Sema &S) { 10690 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10691 CE = Current.end(); 10692 if (Ctor->isInvalidDecl()) 10693 return; 10694 10695 const FunctionDecl *FNTarget = 0; 10696 CXXConstructorDecl *Target; 10697 10698 // We ignore the result here since if we don't have a body, Target will be 10699 // null below. 10700 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10701 Target 10702= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10703 10704 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10705 // Avoid dereferencing a null pointer here. 10706 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10707 10708 if (!Current.insert(Canonical)) 10709 return; 10710 10711 // We know that beyond here, we aren't chaining into a cycle. 10712 if (!Target || !Target->isDelegatingConstructor() || 10713 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10714 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10715 Valid.insert(*CI); 10716 Current.clear(); 10717 // We've hit a cycle. 10718 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10719 Current.count(TCanonical)) { 10720 // If we haven't diagnosed this cycle yet, do so now. 10721 if (!Invalid.count(TCanonical)) { 10722 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10723 diag::warn_delegating_ctor_cycle) 10724 << Ctor; 10725 10726 // Don't add a note for a function delegating directo to itself. 10727 if (TCanonical != Canonical) 10728 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10729 10730 CXXConstructorDecl *C = Target; 10731 while (C->getCanonicalDecl() != Canonical) { 10732 (void)C->getTargetConstructor()->hasBody(FNTarget); 10733 assert(FNTarget && "Ctor cycle through bodiless function"); 10734 10735 C 10736 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10737 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10738 } 10739 } 10740 10741 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10742 Invalid.insert(*CI); 10743 Current.clear(); 10744 } else { 10745 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10746 } 10747} 10748 10749 10750void Sema::CheckDelegatingCtorCycles() { 10751 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10752 10753 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10754 CE = Current.end(); 10755 10756 for (DelegatingCtorDeclsType::iterator 10757 I = DelegatingCtorDecls.begin(ExternalSource), 10758 E = DelegatingCtorDecls.end(); 10759 I != E; ++I) { 10760 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10761 } 10762 10763 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10764 (*CI)->setInvalidDecl(); 10765} 10766 10767/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10768Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10769 // Implicitly declared functions (e.g. copy constructors) are 10770 // __host__ __device__ 10771 if (D->isImplicit()) 10772 return CFT_HostDevice; 10773 10774 if (D->hasAttr<CUDAGlobalAttr>()) 10775 return CFT_Global; 10776 10777 if (D->hasAttr<CUDADeviceAttr>()) { 10778 if (D->hasAttr<CUDAHostAttr>()) 10779 return CFT_HostDevice; 10780 else 10781 return CFT_Device; 10782 } 10783 10784 return CFT_Host; 10785} 10786 10787bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10788 CUDAFunctionTarget CalleeTarget) { 10789 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10790 // Callable from the device only." 10791 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10792 return true; 10793 10794 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10795 // Callable from the host only." 10796 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10797 // Callable from the host only." 10798 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10799 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10800 return true; 10801 10802 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10803 return true; 10804 10805 return false; 10806} 10807